Display device

There is disclosed an arrangement which has a projection means (LEDs) for projecting a light, a display means (mirror, finder view field range and the like) for guiding the light projected by the projection means to a predetermined display portion to display an index in the display portion, a variable means (masks, motor, decentring axis and the like) for periodically changing a projecting direction of the light of the projection means, and a control means (mask position detection circuit, control circuit and the like) for determining a projection timing of the projection means in accordance with the projecting direction changed by the variable means to control a position of the index on the display portion. By controlling the projection timing of the projection means, the position of the index in the display portion is controlled. Thereby, without irregularly or complicatedly changing the projecting direction itself, the index can be variously displayed.

BACKGROUND OF THE INVENTION 
1. Field of the Invention 
The present invention relates to a display device for a display in a finder 
or the like of a camera or an optical apparatus. 
2. Related Background Art 
Recently, developments and researches have been eagerly advanced for a 
camera which can prevent a failure in photographing caused by a blurring 
from a hand vibration by a photographing person. 
The camera is provided with a vibration sensor which accurately detects a 
vibration of the camera. Usually, by operating a correction mechanism for 
decentring a photographing optical axis based on detected information, an 
image blur is suppressed. 
However, in a compact camera, since a finder is of an external type, not of 
a TTL system, the correction mechanism for decentring the photographing 
optical axis can correct a blur of an image being photographed, but cannot 
correct a blur in the finder while a photographing person aims at an 
object. Therefore, a finder mechanism also requires another image blur 
correction means. 
To solve the problem, for example, the Japanese Patent Application 
Laid-open No. 5-204021 discloses a camera in which by restricting a 
periphery of a finder view field with an LCD (liquid crystal display), a 
blur quantity and a blur correction quantity are displayed. 
Also, the Japanese Patent Application Laid-open No. 1-123219 discloses a 
camera in which a blurring from a hand vibration is optically displayed as 
a movement of a photo image. 
On the other hand, recently, for the purpose of preventing a mistake of 
middle-off in automatic focusing (a phenomenon in which although a 
distance measuring region exists in a central point, a distance is 
measured by mistake in a case where main objects exist on the right and 
left sides in a finder view field or in other cases), a multipoint AF 
camera has become popular which is provided with plural distance measuring 
regions in a photographing screen. 
In the finder view field of the camera, in many cases a distance measuring 
index exists only in a central portion. Therefore, it cannot be determined 
whether or not the middle-off can be prevented. 
To solve the problem, a camera is increasingly manufactured and generalized 
in which only a distance measuring index of a selected distance measuring 
region is displayed by using an LCD incorporated in a finder optical 
system. 
However, in the conventional camera disclosed in the aforementioned 
Japanese Patent Application Laid-open No. 5-204021, by restricting the 
display in the finder view field frame by the LCD, the blur quantity and 
the blur correction quantity are displayed, thereby resulting in following 
disadvantages. 
(1) Since a resolution of a display pitch is determined by a divided pitch 
of an LCD segment, a blur is displayed remarkably roughly. A feeling of 
moving linearly in response to a blurring from a hand vibration cannot be 
grasped. 
(2) Since the LCD needs to be incorporated in the finder optical system, 
the finder is made remarkably dark by the influence of an LCD 
transmittance and a polarizing plate. 
(3) The LCD largely increases a cost. 
Also, in the conventional camera disclosed in the aforementioned Japanese 
Patent Application Laid-open No. 1-123219, the blurring from the hand 
vibration is optically displayed as the movement of the photo image, but 
an effect of correction of the blurring is not displayed. 
On the other hand, in the conventional multipoint AF camera, only the 
distance measuring index of the distance measuring region selected from 
plural distance measuring regions can be displayed. However, since the LCD 
is used, following defects are present: the finder becomes remarkably dark 
because of the influence of the LCD transmittance and the polarized plate; 
and the LCD largely increases a cost. 
SUMMARY OF THE INVENTION 
One aspect of the invention provides an arrangement which has a projection 
means for projecting a light, a display means for guiding the light 
projected by the projection means to a predetermined display portion to 
display an index in the display portion, a variable means for periodically 
changing a projecting direction of the light of the projection means, and 
a control means for determining a projection timing of the projection 
means in accordance with the projecting direction changed by the variable 
means to control a position of the index on the display portion. By 
controlling the projection timing of the projection means, the position of 
the index in the display portion is controlled. Thereby, without changing 
the projecting direction irregularly or complicatedly, the index can be 
variously displayed.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
Embodiments of the present invention will be described in detail with 
reference to the accompanying drawings. 
(First Embodiment) 
FIG. 1 is a top-face view of a camera finder display mechanism according to 
a first embodiment of the invention. In FIG. 1, numeral 1 denotes an 
objective lens, 2 denotes an eyepiece lens, 3 and 4 denote translucent 
mirrors, and 5 denotes a total reflection mirror. Numeral 6 denotes a mask 
for a blur correction display in a pitch direction (vertical direction of 
the camera), 7 denotes a mask for a blur correction display in a yaw 
direction (transverse direction of the camera), and these components are 
engaged with a decentring axis 8. The decentring axis 8 is inserted with 
pressure into a rotation axis of a motor 9. Numeral 10 denotes a photo 
interrupter which detects a position of the mask 6 for the blur correction 
display in the pitch direction, 11 denotes an LED for the blur correction 
display in the pitch direction, and 12 denotes an LED for the blur 
correction display in the yaw direction. 
After a light of the LED 11 is restricted to a predetermined configuration 
by the mask 6, the light is passed through the translucent mirror 4 and 
reflected by the translucent mirror 3 in a direction of the eyepiece lens 
2. Also, after a light of the LED 12 is restricted to a predetermined 
configuration by the mask 7, the light is reflected by the total 
reflection mirror 5 and the translucent mirror 4, and further reflected by 
the translucent mirror 3 in the direction of the eyepiece lens 2. 
A photographing person can observe an object image formed by the objective 
lens 1 and the eyepiece lens 2, and can additionally observe photo images 
of the LEDs 11 and 12 simultaneously on the translucent mirror 3. 
FIG. 2 is an enlarged view of the masks 6 and 7, the decentring axis 8 and 
the photo interrupter 10 in FIG. 1, and an enlarged partial view of FIG. 1 
as seen from the right side. 
As shown in FIG. 2, an opening 6a and elongated holes 6b and 6c are formed 
in the mask 6, while an opening 7a and elongated holes 7b and 7c are 
formed in the mask 7. 
The mask 6 can move vertically in the figure with the elongated hole 6b 
engaged with protrusions 13a and 13b of a bottom board 13 (not shown). The 
mask 7 can move in a transverse direction in the figure with the elongated 
hole 7b engaged with protrusions 13c and 13d of the bottom board 13. 
The decentring axis 8 is rotated about the rotation axis 8a inserted with 
pressure in the motor 9. A protrusion 8b provided in a position decentring 
by a predetermined distance from the rotation axis 8a is engaged in the 
elongated hole 6c of the mask 6 and the elongated hole 7c of the mask 7. 
Thereby, the mask 6 is reciprocated vertically in the figure, while the 
mask 7 is reciprocated laterally in the figure. 
Therefore, when the opening 6a of the mask 6 is positioned above, the 
opening 7a of the mask 7 is positioned on the left side. When the opening 
6a of the mask 6 is positioned below, the opening 7a of the mask 7 is 
positioned on the right side. 
The photo interrupter 10 is fixed to the bottom board 13 (not shown) for 
detecting a position of the mask 6 reciprocated vertically. 
FIG. 3 is a block diagram showing a main portion of a camera electric 
arrangement according to the first embodiment of the invention. 
In FIG. 3, numeral 15 denotes a vibration circuit, 16 denotes a mask 
position detecting circuit, 17 denotes a vibration detection circuit, 18 
denotes a light source, and these components are connected to and 
controlled by a microcomputer or another control circuit 19. Numeral 14 
denotes a blur prevention switch. Only when the switch is turned on, a 
finder display mechanism is operated. 
The vibration circuit 15 is provided for vibrating the masks 6 and 7 in 
FIG. 1, and constituted of the motor 9 for operating the decentring axis 8 
and its drive circuit. The mask position detecting circuit 16 detects the 
position of the mask 6 with the photo interrupter 10 in FIG. 1. When the 
mask 6 reaches a predetermined position, a signal is transmitted to the 
control circuit 19. 
The vibration detection circuit 17 is constituted of a vibration detection 
sensor for detecting an angular velocity of a vibration gyroscope or the 
like and a sensor output arithmetic operation circuit which cuts a DC 
component from an output of the vibration detection sensor to obtain an 
angular displacement through integration. The hand vibration by the 
photographing person is detected, and its angular displacement information 
is transmitted to the control circuit 19. Additionally, the vibration 
detection sensor is constituted of two sensors: a sensor for detecting a 
vibration in the pitch direction; and a sensor for detecting a vibration 
in the yaw direction. 
The light source 18 includes the LEDs 11 and 12 of FIG. 1. The control 
circuit 19 controls a light-on timing of the light source 18 in accordance 
with the signal from the mask position detecting circuit 16 and the 
angular displacement information from the vibration detection circuit 17. 
FIGS. 4A and 4B show camera finder view fields in the arrangement described 
above. FIG. 4A shows an initial condition when the blur prevention switch 
14 is turned on, and FIG. 4B shows a subsequent condition in which a 
camera is vibrated toward a lower right side in the figure. 
In FIGS. 4A and 4B, numeral 20 denotes a finder view field range, and 20a 
denotes a finder view field before the vibration. Numeral 21 denotes an 
object, 22 denotes a blur correction display in the pitch direction, and 
23 denotes a blur correction display in the yaw direction. The blur 
correction displays 22 and 23 are photo images of the LEDs 11 and 12, 
respectively. 
As shown in FIG. 4B, when the camera is vibrated toward the lower right 
direction in the figure, the blur correction display 22 are moved in 
reverse or upper left direction, and the blur correction display 23 is 
moved toward the left. Then, a positional relationship between the object 
21 and the blur correction displays 22, 23 is held. 
FIG. 5 is a timing chart showing a control image of an LED light-on timing 
in the camera constituted as aforementioned. 
In FIG. 5, numeral 24 denotes a waveform which is constituted by converting 
to an angular displacement a stroke of the mask 6 which is reciprocated 
when the motor 9 is rotated at a constant rate. Numeral 25 denotes an 
output waveform of the vibration detection circuit 17. Additionally, an 
angle .theta. with the center is represented on the axis of ordinate, and 
a time T is represented on the axis of abscissa. 
Numeral 26 denotes a PI pulse waveform which is formed after A/D conversion 
of an output from the photo interrupter 10. Numeral 27 denotes a waveform 
which indicates a timing of A/D conversion of an output from the vibration 
detection circuit 17. In synchronization with a pulse rising of the PI 
pulse waveform 26, the A/D conversion is started. Numeral 28 denotes a 
waveform indicative of an LED on timing. 
Numeral 26a denotes a pulse rising point of the PI pulse waveform 26, and 
numeral 24a denotes a stroke maximum point of the mask stroke waveform 24. 
A period of time from the pulse rising point 26a to the stroke maximum 
point 24a is a delay time. Additionally, the delay time is in proportion 
to the rotation speed of the motor 9. Therefore, when the rotation speed 
is constant, the delay time is constant. However, the pitch mask 6 is 
different in delay time from the yaw mask 7. 
Numeral 28a denotes an LED on timing. A period of time from the stroke 
maximum point 24a to the LED on timing 28a is represented by .DELTA.T, 
which is obtained as described later with reference to FIG. 6. 
Also, in the embodiment, the vibration in the pitch direction and the 
vibration in the yaw direction have been described without being 
separated. Both the directions are operated with the aforementioned 
control image. 
FIG. 6 is an explanatory view for obtaining an LED light-on delay time 
.DELTA.T. Numeral 29 denotes a waveform indicative of a table which shows 
a relationship between an output angle of the vibration detection circuit 
17 and the LED light-on delay time .DELTA.T. An angle .theta. is 
represented on the axis of ordinate, and a time T is represented on the 
axis of abscissa. 
For example, when the output angle of the vibration detection circuit 17, 
i.e., a blur quantity is represented by .alpha., as seen from the table 
waveform 29, the LED light-on delay time .DELTA.T becomes .DELTA.T1. 
Additionally, for the table, two tables are prepared in the control 
circuit 19 for the pitch and the yaw, respectively. 
Operation of a main portion of the camera constituted as aforementioned 
will be described with reference to the flowchart of FIG. 7. 
First, at step #101 power supply is turned on. The process then goes to 
step #102, at which a condition of the blur prevention switch 14 is 
determined. When the blur prevention switch 14 is turned on, the process 
goes to step #103 for driving the motor 9. 
When the motor 9 is rotated, the decentring axis 8 is also rotated, and the 
masks 6 and 7 start vibrating (reciprocating). In this case, the rotation 
speed of the motor 9 is determined in such a manner that the vibration of 
the mask 6 or 7 exceeds 60 Hz. 
At the subsequent step #104, a standby time of 100 ms elapses until the 
rotation of the motor 9 is stabilized. At the next step #105, a condition 
of the PI pulse is determined. When the PI pulse rises, the process goes 
to step #106 for starting a timer. Additionally, at the next step #107, 
outputs of the pitch-direction vibration detection sensor and the 
yaw-direction vibration detection sensor are A/D converted. At the next 
step #108, based on a result of the step #107 and the table 29 shown in 
FIG. 6, pitch-direction and yaw-direction LED light-on delay times 
.DELTA.T(P) and .DELTA.T(Y) are calculated, respectively. 
At step #109, it is determined whether or not the timer started at the step 
#106 exceeds "delay+.DELTA.T(Y)". If it is not exceeded, the process goes 
to step #113. Then, at the step #113, it is determined whether or not the 
timer started at the step #106 exceeds "delay+.DELTA.T(P)". If it is not 
exceeded, the process returns to the step #109. It is again determined 
whether or not "delay+.DELTA.T(Y)" is exceeded. In this case, if it is 
determined that "delay+.DELTA.T(Y)" is exceeded, the process advances to 
step #110. 
At the step #110, the yaw-direction LED 12 is turned on for 100 .mu.s. This 
condition equals, for example, the yaw-direction blur correction display 
23 shown in FIG. 4B. The process then advances to step #111, where a 
standby condition is continued until the timer exceeds 
"delay+.DELTA.T(Y)". Thereafter, when the timer exceeds 
"delay+.DELTA.T(Y)", the process advances to step #112, where the 
yaw-direction LED 12 is turned off. 
Also, when it is determined at the step #113 that the timer exceeds 
"delay+.DELTA.T(P)", the process goes to step #114, where the 
pitch-direction LED 11 is turned on for 100 .mu.s. The condition equals, 
for example, the pitch-direction blur correction display 22 shown in FIG. 
4B. Subsequently, the process goes to step #115, and is on standby until 
the timer exceeds "delay+.DELTA.T(P)". Thereafter, when the timer exceeds 
"delay+.DELTA.T(P), the process advances to step #116 for turning off the 
pitch-direction LED 11. 
At the subsequent step #117, the timer is reset. At the next step #118, the 
condition of the blur prevention switch 14 is again determined. When the 
blur prevention switch 14 is turned on, the process returns to step #105. 
Specifically, the operation of the steps #105 to #118 is repeated until 
the blur prevention switch 14 is turned off. 
In the first embodiment described above, at 30 Hz or more the LED appears 
to be lit because of an afterimage effect. Here, at 60 Hz or more the 
masks 6 and 7 are vibrated vertically and laterally. At every vibration 
cycle of the masks 6 and 7, the LEDs 11 and 12 are momentarily turned on 
in synchronization with the vibration output of the vibration detection 
circuit 17. Therefore, mask images (blur correction displays) lit by the 
LEDs 11 and 12 look as if they move smoothly in a direction in which blur 
is corrected. (The images do not appear to flicker or blur.) 
Specifically, the blur correction display can be moved and displayed in a 
direction reverse to a blur direction in a finder image plane. A blur 
prevention effect can be recognized intuitively. 
Additionally, light is projected by the LED in a finder optical path 
through the opening in the mask. The photo image is thus formed as the 
blur correction display in the finder image plane. Therefore, as compared 
with the conventional arrangement using the LCD, the embodiment provides a 
better visibility and a cost effectiveness. 
(Second Embodiment) 
FIG. 8 is a top-face view of a finder display mechanism in a camera 
according to a second embodiment of the invention. In FIG. 8, the same 
components as those in FIG. 1 are denoted by the same numerals, and the 
description thereof is omitted. 
In FIG. 8, numeral 30 denotes a mask for displaying a distance measuring 
index. The mask 30 is engaged with a decentring axis 31. The decentring 
axis 31 is inserted with pressure into a rotation axis of a motor 32. 
Numeral 33 denotes a photo interrupter for detecting a position of the 
mask 30, and 34 denotes an LED for displaying a distance measuring index. 
A light of the LED 34 is restricted by the mask 30 into a distance 
measuring index configuration. The light is then reflected by the 
translucent mirror 3 toward the eyepiece lens 2. 
A photographing person can observe an object formed by the objective lens 1 
and the eyepiece lens 2, and can simultaneously observe a photo image of 
the LED 34 on the translucent mirror 3. 
FIG. 9 is an enlarged view of the mask 30, the decentring axis 31 and the 
photo interrupter 33 in FIG. 8, and an enlarged partial view of FIG. 8 as 
seen from the right side. 
In FIG. 9, the mask 30 is provided with an opening 30a and elongated holes 
30b and 30c. The mask 30 can move laterally in the figure with the 
elongated hole 30b engaged with protrusions 13e and 13f of the bottom 
board 13 (not shown). 
The decentring axis 31 is rotated about a rotation axis 31a inserted with 
pressure in the motor 32. A protrusion 31b provided in a position 
decentring by a predetermined distance from the rotation axis 31a is 
engaged in the elongated hole 30c of the mask 30. Thereby, the mask 30 is 
reciprocated laterally in the figure. 
FIG. 10 is a block diagram showing an electric arrangement of the camera 
according to the second embodiment of the invention. 
In FIG. 10, numeral 36 denotes a vibration circuit, 37 denotes a mask 
position detecting circuit, 38 denotes a distance measuring circuit, 39 
denotes an automatic selection circuit, 40 denotes a light source, and 
these components are connected to and controlled by a control circuit 41. 
Numeral 35 denotes an AF switch. Only when the AF switch is turned on, a 
finder display mechanism is operated. 
The vibration circuit 36 is provided for vibrating the mask 30 in FIG. 8, 
and constituted of the motor 32 for operating the decentring axis 31 and 
its drive circuit. The mask position detecting circuit 37 detects the 
position of the mask 30 with the photo interrupter 33 in FIG. 8. When the 
mask 30 reaches a predetermined position, a signal is transmitted to the 
control circuit 41. The distance measuring circuit 38 measures distances 
in plural measurement distance regions in a photographed image plane. In 
the automatic selection circuit 39, a position of a main subject is 
determined based on each distance measuring information obtained from the 
distance measuring circuit 38, and relevant distance measuring region and 
distance measuring information are automatically selected. The luminous 
source 40 corresponds to the LED 34 in FIG. 8. The control circuit 41 
controls a light-on timing of the light source 40 based on the signal from 
the mask position detecting circuit 37 and the selected distance measuring 
information from the automatic selection circuit 39. 
FIGS. 11A to 11D show finder view fields of the camera constituted as 
aforementioned in the case in which there are three distance measuring 
regions (middle, right and left) of the distance measuring circuit 38 in a 
lateral direction. 
FIG. 11A shows the case where the "middle" distance measuring region is 
selected by the automatic selection circuit 39, FIG. 11B shows the case 
where the "left" distance measuring region is selected by the automatic 
selection circuit 39, FIG. 11C shows the case where the "right and left" 
distance measuring regions are selected by the automatic selection circuit 
39, and FIG. 11D shows the case where the "right, middle and left" 
distance measuring regions are selected by the automatic selection circuit 
39. 
In FIGS. 11A to 11D, numeral 42 denotes a finder view field range, 43 
denotes a distance measuring index of the middle distance measuring 
region, 44 denotes a distance measuring index of the left distance 
measuring region, and 45 denotes a distance measuring index of the right 
distance measuring region. 
The distance measuring indexes 43, 44 and 45 are photo images of the LED 
34. Display positions of the images are determined by the light-on timing 
of the LED 34 in the control circuit 41. 
FIG. 12 is a timing chart showing a control image of the LED light-on 
timing in the camera constituted as aforementioned. 
In FIG. 12, numeral 46 denotes a waveform indicative of a position of the 
mask 30 which is reciprocated when the motor 32 is rotated at a constant 
speed. The axis of ordinate represents a distance from a middle position, 
and the axis of abscissa represents a time. 
Numeral 47 denotes a PI pulse waveform after A/D conversion of an output 
from the photo interrupter 33, and numerals 48 to 51 denote waveforms 
indicative of light-on timings of the LED 34. The waveform 48 is formed 
when the "middle" distance measuring region is selected by the automatic 
selection circuit 39. The waveform 49 is formed when the "left" distance 
measuring region is selected by the automatic selection circuit 39. The 
waveform 50 is formed when the "right and left" distance measuring regions 
are selected by the automatic selection circuit 39. The waveform 51 is 
formed when the "left, middle and right" distance measuring regions are 
selected by the automatic selection circuit 39. 
Numeral 47a denotes a moment at which the PI pulse waveform 47 has a pulse 
rising, 46a denotes a moment at which the opening 30a of the mask 30 is in 
the "left" distance measuring region, 46b denotes a moment at which the 
opening 30a of the mask 30 is in the "middle" distance measuring region, 
and 46c denotes a moment at which the opening 30a of the mask 30 is in the 
"right" distance measuring region. A time from the moment 47a till 46a is 
represented by T(L), a time from the moment 47a till 46b is represented by 
T(C), and a time from the moment 47a till 46c is represented by T(R). 
Additionally, T(L), T(C) and T(R) are in proportion to the rotation speed 
of the motor 32, and are constant when the rotation speed is constant. 
Operation of the main portion of the camera constituted as aforementioned 
will be described with reference to the flowchart of FIG. 13. 
First, when at step #201 power supply is turned on, the process advances to 
step #202 which determines a condition of the AF switch 35. For example, 
when a release button (not shown) is depressed to a first stage, the AF 
switch 35 is turned on. When the AF switch 35 is turned on, the process 
goes to step #203 for driving the motor 32. 
When the motor 32 is rotated, the decentring axis 31 is also rotated and 
the mask 30 starts vibrating (reciprocating). At this time, the rotation 
speed of the motor 32 is determined in such a manner that the vibration of 
the mask 30 exceeds 60 Hz. 
At the subsequent step #204, the distance measuring circuit 38 measures 
plural distance measuring regions in a photographed image plane. Then, at 
step #205, based on each distance measuring information obtained at the 
step #204, a position of the main subject is determined by the automatic 
selection circuit 39 (for example, the distance measuring point of the 
latest distance is regarded as the position of the main subject). The 
relevant distance measuring region and information are automatically 
selected. At the subsequent step #206, from the distance measuring region 
selected at the step #205, a light-on timing T of the LED 34 is determined 
based on FIG. 12. 
At the subsequent step #207, a condition of the PI pulse waveform is 
determined. When the pulse rises, the process advances to step #208 for 
starting a timer. It is determined at the subsequent step #209 whether or 
not the timer started at the step #208 exceeds the light-on timing T 
determined at the step #206. When it is exceeded, the process advances to 
step #210 for turning on the LED 34 for 100 .mu.s. Then, it is determined 
at the subsequent step #211 whether or not the lighting of the LED 34 is 
completed in the distance measuring region selected at the step #205. As a 
result, when the lighting of all the selected distance measuring regions 
is finished, the process advances to step #212. When it is not finished, 
the process returns to the step #209. Specifically, when plural distance 
measuring regions are selected, the operation of the steps #209 to #211 is 
repeated in accordance with the number of regions. Consequently, as shown 
in FIGS. 11C and 11D, the distance measuring indexes can be displayed. 
At the step #212, the timer is reset. At the subsequent step #213, the 
condition of the AF switch 35 is again determined. Here, when the AF 
switch 35 is turned on, the process returns to the step #207. 
Specifically, by repeating the operation of the steps #207 to #213 until 
the AF switch 35 is turned off, the distance measuring indexes continue to 
be displayed. 
In the second embodiment described above, at 60 Hz or more the mask is 
vibrated. The LED is momentarily turned on in synchronization with the 
distance measuring region selected at every vibration cycle of the mask. 
Therefore, a mask image (distance measuring index) can be lit and 
displayed by the LED in a predetermined position in the finder view field. 
It becomes quite obvious which of plural distance measuring regions is 
focused on. (The distance measuring index does not appear to flicker or 
blur.) 
Specifically, since the distance measuring index is displayed in the 
selected distance measuring region in the finder image plane, the selected 
distance measuring region can be easily determined. Additionally, since 
the distance measuring index is lit, the visibility is enhanced. 
Also, as compared with the conventional arrangement in which the LCD is 
used, the embodiment is more cost-effective. 
In the first embodiment, the blurs in the pitch and yaw directions are 
displayed, but this is not restricted. Either one direction may be 
displayed. 
Also, in the second embodiment, three distance measuring regions are 
selected. In the invention, more distance measuring regions may be 
selected. Further, by applying the same arrangement to plural photometry 
regions, instead of the distance measuring regions, a selected photometry 
region can be clearly informed. 
Also, even when the distance measuring region is varied in the finder view 
field following a change in a focal length in a zoom camera, the invention 
can be applied. (With changes in focal length, an LED light-on timing may 
be adjusted.) 
In the embodiments, the mask member and the light source are separately 
arranged, and the mask member is reciprocated. These may be integrally 
formed and integrally reciprocated. The movement is not restricted to 
reciprocation. Possible is a circular movement or another movement by 
which a photo image having a predetermined configuration can be projected 
in a finder. 
The invention is not limited to the aforementioned embodiments, and can be 
constituted in any manner as long as functions recited in claims and 
described in the embodiments can be attained. 
(Third Embodiment) 
FIG. 14 shows a structure of a vibrating body of a vibration gyroscope as a 
vibration detection sensor according to a third embodiment of the 
invention. 
In FIG. 14, numeral 111 denotes a metallic vibrator; 112 denotes a 
permanent magnet provided in a vicinity of a tip end of the vibrator 111; 
113 and 114 denote piezoelectric elements provided in a vicinity of a 
fixed end of the vibrator 111; 115 and 116 denote lead wires for taking 
out electric charges arising on surface electrodes; 117 denotes a lead 
wire for grounding the vibrator 111; 118 denotes a base mounted on a 
bottom board (not shown) to which the vibrator 111 is fixed; 119 denotes a 
press member for holding the vibrator 111 together with the base 118; 120 
denotes a coil for generating a drive force on the permanent magnet 112 by 
means of Lorentz force; and 121 denotes a photo reflector for optically 
detecting vibration displacements of the vibrator 111 and the permanent 
magnet 112 excited by the coil 120. A normal position of the coil 120 is 
shown by two-dot chain line in FIG. 14. 
An excitation piece 111a and a detection piece 111b of the vibrator 111 are 
orthogonally interconnected by a flange 111c, and integrally formed. The 
pieces are altogether worked with a forging press, but may be formed 
through a metal injection or a cutting. 
Mounting of the vibrator 111 onto the base 118 will be described. 
On the piezoelectric element 113 formed is an attachment portion 113a of 
the lead wire 115 which is exposed onto a fixed portion 111d of the 
vibrator 111. In the same manner, on the piezoelectric element 114 formed 
is an attachment portion 114a (not shown) of the lead wire 116 which is 
exposed onto the fixed portion 111d of the vibrator 111. To clear the 
attachment portions 113a, 114a and the lead wires 115, 116, a groove 118a 
is formed in the base 118 and a groove 119a is formed in the press member 
119. 
On opposite sides of the groove 118a of the base 118 formed are pressing 
faces 118b which abut on the fixed portion 111d of the vibrator 111. The 
press member 119 also has on a side face opposed to the vibrator 111 
pressing faces (not shown) having the same configurations as the pressing 
faces 118b. 
In FIG. 14, three screws are inserted from the side of the press member 119 
and fastened through holes 119b and 111e into screw holes 118c. Then, the 
fixing portion 111d of the vibrator 111 is held. The lead wires 115 and 
116 are drawn through a hole 118d toward a rear side of the base 118. The 
vibrator 111 is thus integrally constituted. 
As aforementioned, the attachment portions 113a and 114a of the 
piezoelectric elements 113 and 114 and the lead wires 115 and 116 are 
attached inside the fixed end. Therefore, the vibration of the vibrator 
111 is prevented from being adversely affected by tensions of the lead 
wires 115 and 116. 
Operation principle of the aforementioned vibration detection sensor will 
be described. 
FIG. 15 is a block diagram showing an arrangement of a circuit which 
controls excitation of the vibrator and processes detection signals, i.e., 
a circuit of the vibration gyroscope. In FIG. 15, the same portion as FIG. 
14 is denoted by the same numerals. 
In FIG. 15, a vibration displacement signal in a y-direction (excitation 
direction) as seen in FIG. 14 of the excitation piece 111a of the vibrator 
111 is detected by the photo reflector 121, and transmitted to and 
amplified by an amplification circuit 122. The signal is passed through a 
next-stage band-pass filter 123. Then, a signal in a vicinity of a 
resonance frequency of the excitation piece 111a is taken out. The signal 
is adjusted by a phase shifting circuit 124 to have a phase of an input 
signal of the coil 120. Thereafter, an output signal of the phase shifting 
circuit 124 has its excitation amplitude adjusted by an AGC circuit 125 to 
form an input signal which generates Lorentz force to perform a stable 
excitation with a constant amplitude. While an electric current is 
supplied by a drive circuit 126, an input signal is supplied to the coil 
120. The electric current flowing through the coil 120 has a direction in 
reverse to a z-axis direction in opposite winding coils as seen from a 
front side in an x-axis direction in FIG. 14. Therefore, when magnetic 
directions of the opposite permanent magnets 112 are in reverse to each 
other relative to the x-axis direction, excitation forces generated by 
Lorentz force act on both the permanent magnets 112 in the same directions 
relative to the y-axis direction. Therefore, the excitation amplitude is 
enlarged. 
In this manner, a positive feedback loop is formed. The excitation piece 
111a performs a self-oscillation at a constant amplitude in the y-axis 
direction. 
In the condition, as shown in FIG. 14, when a vibration with an angular 
velocity .OMEGA. is applied about the z-axis via the base 118 to the 
vibrator 111, on the excitation piece 111a and especially on the magnets 
112 to which a mass is concentrated, Coriolis force is generated in the 
x-axis direction (detecting direction) in proportion to the mass, the 
excitation rate and the angular velocity .OMEGA.. The Coriolis force is 
transmitted via the flange 111c to the detection piece 111b. Then, the 
detection piece 111b is deflected in the x-axis direction. In this case, a 
bending deflection applied to the piezoelectric elements 113 and 114 
provided in the vicinity of the fixed end of the detection piece 111b 
generates on the surface electrodes electric charges in proportion to the 
bending deflection. The charges are taken out as signals. Then, the 
angular velocity .OMEGA. applied about the z-axis is obtained. 
A signal processing process will be described in which the angular velocity 
.OMEGA. applied about the z-axis is obtained from the electric charges 
(voltages) generated on the surface electrodes of the piezoelectric 
elements 113 and 114. 
For the bending deflection received by the piezoelectric elements 113 and 
114, one deflecting force acts in a compressing direction, while the other 
acts in a tensile direction. Therefore, the voltages generated on the 
surface electrodes are reverse to each other in phase. As shown in FIG. 
15, the voltages are amplified by amplification circuits 127 and 128, and 
then differentiated by a differential circuit 129. An output can thus be 
doubled. The output signal has a excitation frequency, and is constituted 
of an AM wave which has an amplitude modulated by the Coriolis force 
(angular velocity). After a noise component with a band other than that of 
the signal in the vicinity of the excitation frequency is cut by a 
band-pass filter 130, an output signal (excitation detecting signal) of 
the photo reflector 121 passed via the amplification circuit 122 and the 
band-pass filter 123 has its phase adjusted by a phase shifting circuit 
132 to form a reference signal. Subsequently, a synchronism wave is 
detected by a synchronism wave detecting circuit 131, and smoothed by a 
smoothing circuit 133. Thereby, a demodulated signal with the angular 
velocity .OMEGA. applied about the z-axis can be obtained. 
In this case, a phase shift quantity of the phase shifting circuit 132 is 
adjusted with a variable resistance or the like in such a manner that 
waves are detected at a timing at which an excited null signal 
superimposed on an output signal of the band-pass filter 130 is maximized 
or minimized. Then, positive and negative areas of the null signal in one 
division of the wave detection usually become equal. Therefore, even if an 
amplitude of the null signal is varied, an output signal of the smoothing 
circuit 133 is not influenced. Specifically, a highly precise and stable 
angular velocity signal can be obtained. Also, by integrating the output 
signal of the smoothing circuit 133 with an integrating circuit 134, an 
angular displacement signal (vibration angle) can be obtained. 
FIG. 16 is a perspective view showing an arrangement of a finder display 
device of the camera according to the third embodiment. The finder display 
device is provided with the vibration gyroscope shown in FIGS. 14 and 15 
as one constitutional element for realizing the blur prevention display. 
In FIG. 16, numeral 141 denotes an LED or another light source; 142 denotes 
a mask which has two parallel and thin transmitting portions formed 
substantially on its middle; and 143 denotes a pitch vibration detection 
sensor for detecting a vibration in a pitch direction (in a perpendicular 
direction when a camera is held in a positive position) which has 
substantially the same structure as shown in FIG. 14. The pitch vibration 
detection sensor 143 is constituted of fixing portions 143a to be fixed 
with screws or the like onto a bottom board (not shown), a reflecting 
portion 143b which is formed by specularly finishing a vicinity of a tip 
end of a vibrator, a piezoelectric element 143c placed adjacent to a root 
of the vibrator for detecting Coriolis force (a pitch-direction vibration 
signal obtained here is used as one of control signals for correcting 
blurs with a correction optical device described later), magnets 143d 
placed on both faces of the vibrator, a coil 143e fixed to the bottom 
board (not shown) in a vicinity of the magnets 143d and a photo reflector 
or another position detection sensor 143f for detecting a vibration 
position of the vibrator. When a predetermined electric current is passed 
through the coil 143e, the vibrator with the magnets 143d placed thereon 
is vibrated at a predetermined frequency along the vertical direction of 
the camera. Additionally, the mask 142 is disposed in such a manner that 
the longitudinal direction of the transmitting portions is perpendicular 
to the longitudinal direction of the vibrator of the pitch vibration 
detection sensor 143. 
Numeral 144 denotes a yaw vibration detection sensor for detecting a 
vibration in a yaw direction of the camera (in a horizontal direction when 
the camera is held in the positive position) which has substantially the 
same structure as shown in FIG. 14. The yaw vibration detection sensor 144 
is constituted of fixing portions 144a to be fixed with screws or the like 
onto the bottom board (not shown), and a reflecting portion 144b. The 
portion 144b is formed by bending and raising a face adjacent to a tip end 
of a vibrator at a predetermined angle, specularly finishing a middle of 
the face in a linear strip with a predetermined width and shutting light 
off opposite side edges. The sensor 144 is further constituted of a 
piezoelectric element 144c placed adjacent to a root of the vibrator for 
detecting Coriolis force (a yaw-direction vibration signal obtained here 
is used as one of the control signals for correcting blurs with the 
correction optical device described later), magnets 144d placed on both 
faces of the vibrator, a coil 144e fixed to the bottom board (not shown) 
in a vicinity of the magnets 144d and a photo reflector or another 
position detection sensor 144f for detecting a vibration position of the 
vibrator. When a predetermined electric current is passed through the coil 
144e, the vibrator with the magnets 144d placed thereon is vibrated at a 
predetermined frequency along an optical-axis direction of the camera. 
Additionally, the longitudinal direction of the reflecting portion 144b is 
set perpendicular to the longitudinal direction of the transmitting 
portion of the mask 142. 
Numeral 145 denotes an image forming lens for forming an image formed by 
the light source 141 and the mask 142 via the reflecting portion 143b of 
the pitch vibration detection sensor 143 onto a vicinity of the reflecting 
portion 144b of the yaw vibration detection sensor 144. Numeral 146 
denotes an image forming lens for forming a photo image of the luminous 
source reflected by the reflecting portion 144b onto a vicinity of a 
finder image forming face. Numeral 147 denotes an objective lens; 148 
denotes variable power lenses; 149 denotes a half mirror; 150 denotes a 
view field frame provided in a vicinity of the finder image forming face; 
151 denotes a prism; 152 denotes an eyepiece lens; and these components 
147 to 152 form a real-image zoom finder system. 
When a light from the light source 141 is passed through the mask 142, two 
thin parallel linear images are formed. The photo images of the light 
source 141 are passed through the image forming lens 145 and reflected by 
the reflecting portion 143b of the pitch vibration detection sensor 143. 
Then, the images are formed on the vicinity of the reflecting portion 144b 
of the yaw vibration detection sensor 144. Here, the two thin parallel 
linear images have their lengths restricted to predetermined lengths by 
the specularly finished width of the reflective portion 144b. The images 
are thus reflected by the reflecting portion 144b, passed through the 
image forming lens 146 and the half mirror 149 and formed onto the 
vicinity of the finder image forming face. The images form a blur 
prevention index 153 described later. 
The photographing person can observe an object overlapping the blur 
prevention index 153 by the half mirror 149. 
When the pitch vibration detection sensor 143 is excited, the position and 
angle of the reflecting portion 143b in the pitch direction are changed. 
Therefore, when the light source 141 is allowed to continuously emit 
lights, the photo image of the light source (parallel linear images) 
varies in image formed position on the reflecting portion 144b and the 
finder image forming face. The blur prevention index 153 is vibrated in 
the pitch direction (vertically). 
Additionally, the angle of the raised and bent face of the reflecting 
portion 144b is set in such a manner that even when the pitch vibration 
detection sensor 143 is excited, the photo image of the light source is 
constantly formed on the vicinity of the face of the reflecting portion 
144b. 
When the yaw vibration detection sensor 144 is excited, the position of the 
reflecting portion 144b in the yaw direction is changed (vibrated along 
the lengths of the parallel linear images). Therefore, when the light 
source 141 is allowed to continuously emit lights, the reflecting range of 
the photo image (parallel linear images) of the light source is varied. 
The blur prevention index 153 appears to vibrate in the yaw direction 
(laterally). 
FIG. 17 is an explanatory view of a flickering timing of the light source 
141 shown in FIG. 16. 
In FIG. 17, numeral 161 denotes a pitch index position output which is 
calculated by converting an output of the position detection sensor 143f 
for detecting the position of the vibrator of the pitch vibration 
detection sensor 143 into a pitch-direction vibration angle based on the 
relationship with a display position of the blur prevention index 153. 
Numeral 162 denotes a yaw index position output which is calculated by 
converting an output of the position detection sensor 144f for detecting 
the position of the vibrator of the yaw vibration detection sensor 144 
into a yaw-direction vibration angle based on the relationship with the 
display position of the blur prevention index 153. Numeral 163 denotes a 
pitch-direction vibration angle output which is calculated from an output 
of the pitch vibration detection sensor 143. Numeral 164 denotes a 
yaw-direction vibration angle output which is calculated from an output of 
the yaw vibration detection sensor 144. Numeral 165 denotes a light 
emitting timing of the light source 141. 
FIG. 17 shows that the pitch vibration detection sensor 143 and the yaw 
vibration detection sensor 144 are excited at frequencies of 300 Hz and 
330 Hz, respectively, for a 1/30 second. As shown in FIG. 17, while the 
pitch index position output 161 vibrates ten times, the yaw index position 
output 162 vibrates eleven times. 
Here, the pitch index position output 161 intersects the pitch-direction 
vibration angle output 163 at ten points, when the pitch index position 
output 161 is tilted positively. (The output may be tilted negatively, but 
if the output is not tilted only positively or negatively, the display 
position of the blur prevention index 153 is deviated by a response delay 
of the light emitting timing of the light source 141, and the display 
improperly blurs.) At the moment of the intersection, when the light 
source 141 emits a light, in accordance with only the pitch-direction 
vibration, the blur prevention display 153 is moved (in the direction 
reverse to the direction of the vibration) and displayed. However, the 
yaw-direction is not necessarily adjusted. 
To solve the problem, at the moment of each intersection (at each point at 
which the pitch index position output 161 and the pitch-direction 
vibration angle output 163 intersects), when the yaw index position output 
162 and the yaw-direction vibration angle output 164 are within 
predetermined values, the light source 141 is allowed to emit a light (at 
the light emitting timing 165). Then, in accordance with the vibration in 
both the pitch and yaw directions, the blur prevention index 153 is moved 
(in the direction reverse to the direction of the vibration) and 
displayed. 
In this manner, the pitch index position output 161 and the yaw index 
position output 162 are deviated from each other in frequency at a rate of 
10:11. At least one light emitting timing occurs for ten vibrations in the 
pitch direction. At least one light emitting timing occurs for eleven 
vibrations in the yaw direction. Also, the blur prevention index 153 is 
positioned two-dimensionally in accordance with a blur in the finder image 
plane. Therefore, the light source 141 is lit once for 1/30 second. By 
repeating the operation described above, because of the afterimage effect, 
the photographing person sees the blur prevention index 153 continuously 
moving in response to the vibration in the direction reverse to the 
vibration direction. With human eyes, the light flickering for 1/30 second 
or more looks as if it is continuously lit, because of its afterimage. 
FIGS. 18A and 18B show finder view fields of the camera provided with the 
finder display device shown in FIG. 16. FIG. 18A shows an initial 
condition when the blur prevention system turns on. FIG. 18B shows that 
the camera is then vibrated or moved toward the lower right side in the 
figure, and the blur prevention index 153 is moved in the reverse 
direction (toward the upper left side) and displayed. 
In FIGS. 18A and 18B, numeral 171 denotes a finder view field range, 172 
denotes an image of an object on a finder, and 173 denotes a finder view 
field range before the camera is vibrated. 
As shown in FIG. 18A, the blur prevention index 153 is first displayed 
substantially in the middle of the finder view field range 171. As shown 
in FIG. 18B, when the camera is vibrated toward the lower right side as 
seen in the figure, the blur prevention index 153 is moved in reverse or 
toward the upper left side, and displayed in substantially the middle of 
the finer view field range 173 before the camera is vibrated. The blur 
prevention effect is thus represented. 
As aforementioned, the blur prevention index 153 in the finder view field 
is continuously moved and displayed to correct blurs. Therefore, the 
photographing person can recognize the blur prevention effect intuitively. 
Further, the vibration detection sensor also serves as the actuator for 
the blur prevention display in the finder. Consequently, the finder 
display device with an inexpensive and space saving blur prevention 
display function can be provided. 
FIG. 19 is a block diagram showing a circuit arrangement of the finder 
display device shown in FIG. 16. 
In FIG. 19, numeral 181 denotes MPU (micro-processing unit); 182 denotes a 
memory; 183 denotes an EEPROM; 184 denotes an LED for displaying an index 
on a finder (corresponding to the light source 141 in FIG. 16); 185 
denotes a driving circuit for driving the LED 184; 186 denotes a vibration 
detection sensor for detecting a vibration in a pitch direction 
(corresponding to the pitch vibration detection sensor 143 in FIG. 16); 
187 denotes a position detection sensor for detecting a position of a 
vibrator of the pitch-direction vibration detection sensor 186 
(corresponding to the position detection sensor 143f in FIG. 16); 188 
denotes a vibration detection sensor for detecting a vibration in a yaw 
direction (corresponding to the yaw vibration detection sensor 144 in FIG. 
16); 189 denotes a position detection sensor for detecting a position of a 
vibrator of the yaw-direction vibration detection sensor 188 
(corresponding to the position detection sensor 144f in FIG. 16); and 190, 
191, 192 and 193 denote amplification circuits. 
In FIG. 19, the vibration detection sensors 186 and 188 and the position 
detection sensors 187 and 189 are connected to an A/D conversion input 
terminal of the MPU 181. 
Operation sequence of the MPU 181 for recognizing the blur prevention 
effect by the display on the finder will be described with reference to a 
flowchart of FIG. 20. 
When a main sequence of the camera is started, for example, by turning on a 
main switch of the camera, in a series of operations for an initial 
process, the MPU 181 reads from the EEPROM 183 a parameter regarding the 
display of the blur prevention index 153 on the finder, and stores the 
parameter into a predetermined address of the memory 182 (#301). 
When IS (blur prevention) is started, for example, by half depressing a 
release operation element (YES at #302), a variable for use in processing 
is initialized. The MPU 181 thus reads from the A/D conversion input 
terminal an output of the vibration detection sensor 186 for detecting the 
vibration in the pitch direction (#303). 
Thereafter, an offset and a gain are adjusted (#304). For the offset 
adjustment, deviations in offsets of the vibration detection sensor 186 
and the position detection sensor 187 passed through the amplification 
circuits 190 and 191 are corrected when the vibration detection sensor 186 
for detecting the vibration and the position detection sensor 187 for 
detecting the position of the vibrator of the vibration detection sensor 
186 are unoperated (the vibrator of the vibration detection sensor 186 is 
stopped and outputs of the vibration detection sensor 186 and the position 
detection sensor 187 are set to zero). 
Also, if signals of the vibration detection sensor 186 and the position 
detection sensor 187 obtained from the amplification circuits 190 and 191 
are compared as they are, even after the offset adjustment, the actually 
visible blur prevention effect is deviated from an observer's sense. To 
correct the deviation, the gain adjustment is performed. Specifically, 
even if the signals of the vibration detection sensor 186 and the position 
detection sensor 187 obtained from the amplification circuits 190 and 191 
have equal values, the actual blur quantity on the finder is not 
necessarily equal to the position of the vibrator of the vibration 
detection sensor 186 at the moment. Therefore, through the gain 
adjustment, the output of the vibration detection sensor 186 is converted 
to the blur quantity on the finder. Then, the blur prevention index is 
displayed on the position of the vibrator of the vibration detection 
sensor 186 which is equal to the blur quantity. 
In the actual processing of the MPU 181, the offset and gain are adjusted 
in a following equation: 
EQU Gp=AMPp(Gp'-OFFSETp) 
In the equation, Gp is an output of the vibration detection sensor 186 
after the adjustment, and Gp' is an output of the vibration detection 
sensor 186 before the adjustment. Constants for the offset and gain 
adjustments are represented by OFFSETp and AMPp, which are both prestored 
in the EEPROM 183. A value of OFFSETp is obtained as a difference in 
output between the vibration detection sensor 186 and the position 
detection sensor 187 when they are unoperated, and stored in the EEPROM 
183. The constant AMPp is used when the output of the vibration detection 
sensor 186 is converted to the blur quantity on the finder, so that the 
blur prevention index is displayed on the vibrator position of the 
vibration detection sensor 186 which is equal to the quantity. The 
constant is experimentally obtained and stored in the EEPROM 183. 
If a value of Gp is larger than the vibration width of the vibrator of the 
vibration detection sensor 186, the value of Gp is substituted for values 
on its opposite ends. Specifically, the output value of the position 
detection sensor 187 for detecting the position of the vibrator is set in 
a range from PRpmin to PRpmax. When the value of Gp is less than PRpmin: 
EQU Gp=PRpmin 
Also, when the value of Gp exceeds PRpmax: 
EQU Gp=PRpmax 
Needless to say, this is performed to display the blur prevention index 153 
based on the output relationship shown in FIG. 17. This prevents the 
problem that the blur prevention index 153 is not displayed in the finder 
image plane when the value of Gp is larger than the vibration width of the 
vibrator of the vibration detection sensor 186. 
The output Gp of the vibration detection sensor 186 after the offset and 
gain adjustments is obtained in this manner, and stored in the memory 182 
(#305). 
Subsequently, the output PRp of the position detection sensor 187 for 
detecting the position of the vibrator of the vibration detection sensor 
186 in the pitch direction is read from the A/D conversion input terminal 
(#306). Then, it is determined whether or not a tilt of an output signal 
from the position detection sensor 187 is positive (#307). This is 
performed by comparing the previous output from the position detection 
sensor 187 stored in the memory 182 with the presently read output value 
PRp. If the value stored in the memory 182 is an initialized value, it is 
determined that the tilt of the output from the position detection sensor 
187 is not positive. In this manner, when the tilt of the output from the 
position detection sensor 187 is not positive (NO at #307), the process 
returns to the #306 to again read the output from the position detection 
sensor 187 for detecting the vibrator position of the vibration detection 
sensor 186 in the pitch direction from the A/D conversion input terminal. 
Again in the step #307, it is again determined whether or not the tilt of 
the output from the position detection sensor 187 is positive. The process 
is repeated until the tilt of the output from the position detection 
sensor 187 becomes positive. 
Subsequently, when the tilt of the output from the position detection 
sensor 187 becomes positive, (YES at #307), the output PRp from the 
position detection sensor 187 at the moment is compared with the output Gp 
of the vibration detection sensor 186 after the offset and gain 
adjustments which is stored in the memory 182 (#308). As a result, when 
the difference is equal to or less than a value of the parameter which is 
read from the EEPROM 183 into the memory 182 in a series of initial 
process, the outputs are regarded as substantially equal. In other words, 
the vibrator of the pitch vibration detection sensor 186 is regarded to be 
in a vibrating condition in which the blur prevention index 153 can be 
displayed in positions of the case where the vibration in the pitch 
direction at the moment is displayed in the image plane (corresponding to 
positions of the outputs 161 and 163 shown by black dots in FIG. 17). 
Then, the process advances to the next step #309. On the other hand, when 
both output values are not regarded as substantially equal (NO at #308), 
the process returns to the step #306 to again read from the A/D conversion 
input terminal the output of the position detection sensor 187 for 
detecting the vibrator position of the vibration detection sensor 186 in 
the pitch direction. The same operation is repeated. 
At the next step #309, the MPU 181 reads from the A/D conversion input 
terminal an output of the vibration detection sensor 188 for detecting the 
vibration in the yaw direction. Thereafter, in the same manner as the 
output of the vibration detection sensor 186 for detecting the vibration 
in the pitch direction, the offset and gain are adjusted (#310). In the 
actual processing of the MPU 181, the offset and gain are adjusted in a 
following equation: 
EQU Gy=AMPy(Gy'-OFFSETy) 
In the equation, Gy is an output of the vibration detection sensor 186 
after the adjustment, and Gy' is an output of the vibration detection 
sensor 186 before the adjustment. Constants for the offset and gain 
adjustments are represented by OFFSETy and AMPy, respectively, which are 
both prestored in the EEPROM 183. A value of OFFSETy is obtained as a 
difference in output between the vibration detection sensor 188 and the 
position detection sensor 189 when they are unoperated, and stored in the 
EEPROM 183. The constant AMPy is used when the output of the vibration 
detection sensor 188 is converted to the blur quantity on the finder, so 
that the index is displayed on the vibrator position of the vibration 
detection sensor 188 which is equal to the quantity. The constant is 
experimentally obtained and stored in the EEPROM 183. 
If a value of Gy is larger than the vibration width of the vibrator of the 
vibration detection sensor 188, the value of Gy is substituted for values 
on its opposite ends. Specifically, the output value of the position 
detection sensor 189 for detecting the position of the vibrator is set in 
a range from PRymin to PRymax. When the value of Gy is less than PRymin: 
EQU Gy=PRymin 
Also, when the value of Gy exceeds PRymax: 
EQU Gy=PRymax 
The output Gy of the vibration detection sensor 188 after the offset and 
gain adjustments is obtained in this manner, and stored in the memory 182 
(#310). 
Subsequently, the MPU 181 reads from the A/D conversion input terminal the 
output PRy of the position detection sensor 189 for detecting the position 
of the vibrator of the vibration detection sensor 188 in the yaw direction 
(#311). Then, the output from the position detection sensor 189 at the 
moment is compared with the output Gy of the vibration detection sensor 
188 after the offset and gain adjustments which is stored in the memory 
182 (#312). As a result, when the difference is equal to or less than the 
value of the parameter which is read from the EEPROM 183 into the memory 
182 in a series of initial process, the outputs are regarded as 
substantially equal. In other words, the vibrator of the yaw vibration 
detection sensor 188 is regarded to be in a vibrating condition in which 
the blur prevention index 153 can be displayed in the positions of the 
case where the vibration in the yaw direction at the moment is displayed 
in the image plane. Then, the process advances to step #313 for displaying 
the blur prevention index 153. On the other hand, when both output values 
are not regarded as substantially equal, the process returns to the step 
#306 to again read from the A/D conversion input terminal the output of 
the position detection sensor 187 for detecting the vibrator position of 
the vibration detection sensor 186 in the pitch direction. 
At the step #313 for displaying the blur prevention index 153, the MPU 181 
outputs a display on signal to the driving circuit 185 (the timing 
corresponds to the light emitting timing 165 shown in FIG. 17). During the 
output of the display on signal, the driving circuit 185 turns on the LED 
184. While the LED 184 is turned on, the blur prevention index 153 is 
displayed on the finder as shown in FIGS. 18A and 18B. 
As aforementioned, the output of the position detection sensor 187 for 
detecting the position of the vibrator in the pitch direction 
substantially equals the output of the vibration detection sensor 186. 
Also, the tilt of the output signal from the position detection sensor 187 
is positive (or negative). Then, the output of the position detection 
sensor 189 for detecting the position of the vibrator in the yaw direction 
substantially equals the output of the vibration detection sensor 188. In 
this case, by displaying the blur prevention index 153, the index 
displayed on the finder constantly follows up an object which is observed 
through the finder. Therefore, the blur prevention effect can be 
confirmed. 
FIGS. 21 to 23 are perspective views showing an arrangement of a correction 
optical device mounted on the camera of the embodiment. 
In FIG. 21, numeral 201 denotes a lens holder for holding a correction lens 
202 in its middle. By displacing the correction lens 202 via the lens 
holder 201 in a plane which is orthogonal to an optical axis, an incident 
light beam can be polarized. Therefore, by detecting a camera vibration 
and displacing the correction lens 202 in such a manner that the light 
beam is polarized in the direction reverse to the camera vibration, the 
camera vibration can be corrected. Numeral 203 denotes a bottom board 
disposed in a lens mirror tube for forming a base to support a lens shift 
mechanism. Numeral 204 denotes a yaw holder which has a protrusion (not 
shown) engaged in an elongated hole 203a of the bottom board 203 and can 
be displaced only in the yaw direction. 
Numeral 205 denotes a guide bar inserted through a guide hole 201a formed 
in the lens holder 201. Both ends of the guide bar 205 are supported by 
bearing portions 204a of the yaw holder 204 in such a manner its axial 
direction coincides with a pitch direction. In the arrangement, the lens 
holder 201 can be displaced only in the pitch direction relative to the 
bottom board 203. The yaw holder 204 can be displaced only in the yaw 
direction relative to the bottom board 203. Therefore, as a result of both 
displacements, the correction lens 202 can be displaced in both the pitch 
and yaw directions. 
Numeral 206 denotes a yaw motor which is constituted of a step motor and 
disposed in such a manner that its rotation axis 206a is perpendicular to 
the optical axis. Also, a male-threaded feed screw 207 is fixed on an 
outer periphery of the rotation axis 206a. FIG. 22A shows a detail of a 
fixing portion. As shown in FIG. 22A, the feed screw 207 is inserted onto 
the rotation axis 206a and fixed with an adhesive. Alternatively, as shown 
in FIG. 22B, the rotation axis may be directly threaded like 206b. 
Numeral 208 denotes a female-threaded nut which is engaged with the feed 
screw 207 and has a U-shaped portion 208a into which a vibration stopper 
member described later is inserted. A tip end of the feed screw 207 is 
engaged with a bearing portion 203b of the bottom board 203. The yaw motor 
206 is fixed with an adhesive or the like to the bottom board 203 in such 
a manner that its axis coincides with the yaw direction. The yaw holder 
204 has nut receiving portions 204b and 204c with the nut 208 inserted 
therebetween and a vibration stopper portion 204d for stopping rotation of 
the nut 208. 
The relationship among the feed screw 207, the nut 208 and the yaw holder 
204 will be described with reference to FIGS. 21 and 23. 
The nut 208 is engaged with the feed screw 207, and additionally inserted 
between the nut receiving portions 204b and 204c of the yaw holder 204. 
With the vibration stopper portion 204d inserted in the U-shaped portion 
208a, the nut 208 is prevented from rotating. When the yaw motor 206 is 
rotated, the feed screw 207 fixed to the motor axis 206a is rotated. When 
the feed screw 207 is rotated, the nut 208 also tries to rotate. However, 
the U-shaped portion 208a of the nut 208 is prevented from rotating by the 
vibration stopper portion 204d. Therefore, the nut 208 fails to rotate, 
and moves in its axial direction by one pitch while the yaw motor 206 is 
rotated once. 
Subsequently, when the nut 208 is moved in the axial direction of the 
thread, the nut 208 abuts on the yaw holder 204 to integrally move the yaw 
holder 204. A yaw spring 209 is disposed between a spring receiving 
portion 204e of the yaw holder 204 and a spring receiving portion 203c of 
the bottom board 203 to give a biasing force to the yaw holder 204 in the 
yaw direction (toward the left in FIG. 21). In this manner, the yaw holder 
204 is biased toward the left. Therefore, a right-side face of the nut 208 
constantly abuts on a left-side face of the nut receiving portion 204c of 
the yaw holder 204. Then, the nut 208 and the yaw holder 204 are 
integrally displaced. Additionally, the feed screw 207 and the nut 208 are 
threaded and finely pitched. The feed screw 207 is never rotated by the 
axial biasing force applied from the nut 208 to the feed screw 207. 
Specifically, the nut 208 moves when the yaw motor 206 is rotated. When 
electricity is cut off to stop the yaw motor 206, however, the nut 208 
stays in a position where it is stopped. 
Numeral 210 is a pitch motor which is constituted of a step motor and fixed 
on the yaw holder 204 in such a manner that a rotation axis 210a is 
perpendicular to the optical axis and coincides with the pitch direction. 
In the same manner as the yaw motor 206, a feed screw 211 with its outer 
periphery male-threaded is fixed to the rotation axis 210a. The feed screw 
211 is engaged with a nut 212, and has its tip end engaged with an axis 
receiving portion 204f of the yaw holder 204. The nut 212 is inserted 
between nut receiving portions 201b and 201c of the lens holder 201. With 
a vibration stopper portion 201d in an U-shaped portion 212a, the nut 212 
is inhibited from rotating. The lens holder 201 is biased upward as seen 
in the figure on the yaw holder 204 by a pitch spring 213 which is 
disposed between the axis receiving portion 204a of the yaw holder 204 and 
the lens holder 201 itself. In the same manner as in the yaw direction, 
when the pitch motor 210 is rotated, the feed screw 211 fixed to the 
rotation axis 210a is rotated. The nut 212 is prevented from rotating by 
the vibration stopper portion 201d of the lens holder 201. Therefore, the 
nut 212 moves in its axial direction by one thread pitch while the feed 
screw 211 is rotated once. Then, the nut 212 abuts on the receiving 
portion 201c of the lens holder 201 to move the lens holder 201. Since the 
lens holder 201 is biased upward by the pitch spring 213, the lens holder 
201 is displaced when a lower face of the nut 212 abuts on a top face of 
the receiving portion 201c of the lens holder 201. 
In the arrangement described above, as the pitch motor 210 rotates, the 
lens holder 201 is displaced in the pitch direction on the yaw holder 204. 
The yaw spring 209 and the pitch spring 213 are disposed to push vicinities 
of guide axes when the yaw holder 204 and the lens holder 201 are 
displaced, respectively. Specifically, the pitch spring 213 pushes the 
lens holder 201 along the axis of the guide bar 205. The yaw spring 209 
pushes a vicinity of a longitudinal axis of the elongated hole 203a. An 
angular moment produced by the spring pushing force is prevented from 
being exerted on the lens holder 201. Therefore, the lens holder 201 can 
be displaced smoothly. Further, the pitch spring 213 exerts a biasing 
force to the lens holder 201 in the direction reverse to a direction of a 
gravity (upward in FIG. 21). The gravity and the spring force are thus 
prevented from acting in the same direction. 
Numeral 214 denotes a yaw displacement sensor which uses a known photo 
reflector in the embodiment. The yaw holder 204 has a sensor reflecting 
portion 204g which is painted white to increase a reflectivity. The yaw 
displacement sensor 214 is fixed to a cover member (not shown). When the 
yaw holder 204 is displaced in the yaw direction, a luminous energy of the 
photo reflector reflected by the reflecting portion 204g is changed, so 
that displacement can be detected. Numeral 215 denotes a pitch 
displacement sensor which uses a photo reflector in the same manner as in 
the yaw direction and is fixed to the cover member. The lens holder 201 
also has a reflecting portion 201e which is painted white to enhance the 
reflectivity in the same manner as the reflecting portion 204g. 
When the lens holder 201 is displaced in the pitch direction, a luminous 
energy of the photo reflector reflected by the reflecting portion 201e is 
changed, so that displacement can be detected. The reflecting portion 201e 
of the lens holder 201 is formed long in parallel with the yaw direction. 
Even when the lens holder 201 is displaced in the yaw direction as the yaw 
holder 204 is displaced, the luminous energy reflected by the light of the 
photo reflector is unchanged. The luminous energy is changed only by the 
displacement in the pitch direction. 
In the arrangement described above, the displacement of the lens holder 201 
which is displaced in both the pitch and yaw directions can be detected 
independently in the pitch direction and the yaw direction. 
In the aforementioned arrangement, the pitch motor 210 fixed onto the yaw 
holder 204 displaces the lens holder 201 (the correction lens 202) in the 
pitch direction. The yaw motor 206 fixed to the bottom board 203 displaces 
the correction lens 202 integrally with the yaw holder 204 and the pitch 
motor 210. In this manner, the direction in which the motor and the 
correction lens 202 are integrally displaced is set as "the yaw direction 
or the horizontal direction". The direction in which only the correction 
lens 202 is displaced is set as "the pitch direction or the perpendicular 
direction". In the perpendicular direction in which the gravity acts, only 
the correction lens 202 is displaced. Therefore, no large load is applied. 
Also, the aforementioned arrangement has a simple structure and provides a 
smooth movement as compared with a structure in which the pitch motor 210 
is fixed on the bottom board 203 in such a manner that the correction lens 
202 and the pitch motor 210 are integrally driven without causing a 
relative displacement therebetween when the correction lens 202 is 
displaced in the yaw direction. Specifically, in the structure where the 
pitch motor 210 is fixed to the bottom board 203, since a relative 
displacement occurs between the pitch motor 210 and the bottom board 203, 
a sliding member for sliding the lens holder 201 is used. Therefore, when 
the correction lens 202 is driven in the yaw direction, a friction occurs 
between the sliding member and the lens holder 201. Because of a 
frictional resistance, a drive load is increased. The structure 
necessarily becomes complicated. Further, a response delay is 
disadvantageously caused by a backlash. The problem can be solved by the 
aforementioned arrangement. 
Also, the pitch motor 210 and the yaw motor 206 are disposed in such a 
manner that directions of the rotation axes 210a and 206a, i.e., 
longitudinal directions of the motors coincide with a direction 
perpendicular to the optical axis. Therefore, the correction optical 
device can be flattened. Specifically, the correction optical device is 
lengthened along the optical axis and fails to be enlarged. Also, when the 
correction optical device is incorporated in the camera, the motor can be 
disposed in a space necessary as a clearance for a shutter blade around 
the lens. A spatial efficiency or the like is enhanced when the correction 
optical device is incorporated in the camera. 
Further, since the movement direction of the correction lens 202 (lens 
holder 201) coincides with the direction of the rotation axis of each 
motor, the correction lens 202 can be displaced by the feed screw as shown 
in FIG. 21. As compared with a conventional arrangement in which an output 
of a motor is transmitted to a cam to displace a correction lens, a 
sufficient force can be exerted without a speed reducer and a highly 
precise control is possible. Because the correction lens 202 is displaced 
by one thread pitch while the motor rotates once. In the case of the cam, 
the correction lens needs to be displaced by all the strokes within one 
rotation of the motor. The movement quantity of the lens per motor 
rotation angle is large, a large force is necessary, and a precision is 
deteriorated. Specifically, in the embodiment, when one thread pitch is 
0.2 mm, the motor rotates five times relative to a stroke of 1 mm. 
Operation of the correction optical device will be briefly described. 
First, when the power supply of the camera is turned on, the yaw 
displacement sensor 214 and the pitch displacement sensor 215 detect the 
position of the lens holder 201 from the luminous energy from the 
reflecting portions 204g and 201e of the yaw holder 204 and the lens 
holder 201. The yaw motor 206 and the pitch motor 210 are then driven. The 
correction lens 202 is thus moved until the center of the correction lens 
202 coincides with a center of an optical photographing system (optical 
axis). When the electricity to the motor is cut off, the correction lens 
202 stays in a position where it is stopped. When no camera vibration 
correction is performed, photographing is performed while the correction 
lens 202 is in the central position. At the time of photographing, when 
the camera vibration correction is performed, based on the signals from 
the vibration detection sensors 186 and 188 shown in FIG. 19, the yaw 
motor 206 and the pitch motor 210 are operated to displace the yaw holder 
204 and the lens holder 201 (correction lens 202) in a direction in which 
the camera vibration is set off. 
FIG. 24 is a block diagram diagrammatically showing an electric arrangement 
of the camera which is provided with the blur prevention system having the 
aforementioned correction optical device, the vibration detection sensors 
and the like, the finder display device and the like. As the camera 
supposed is a compact camera in which a barrel of a photographing lens can 
be lowered. 
In FIG. 24, numeral 301 denotes a camera microcomputer, and 302 denotes a 
camera main switch. Numeral 303 denotes a release operation element. By 
half pushing the release operation element 303, a signal s1 is generated 
to start a photographing preparatory operation, i.e., to start photometry 
and distance measuring. When the release operation element 303 is fully 
pushed, a signal s2 is generated to start a photographing operation 
(exposure). Numeral 304 denotes a photometry circuit for calculating 
photometry information; 305 denotes a distance measuring circuit for 
calculating distance measuring information; 306 denotes a lens focusing 
driving circuit for adjusting a focusing of a photographing lens; 307 
denotes a shutter circuit for opening or closing a shutter; 308 denotes a 
stroboscope device; 309 denotes a zoom driving circuit for adjusting a 
focal length of the photographing lens; 310 denotes a film feeding circuit 
for winding or rewinding a film; 311 denotes the correction optical device 
shown in FIG. 21; and 312 denotes the vibration detection sensor shown in 
FIG. 16. The vibration detection sensor 312 also serves as an actuator for 
blur prevention display, and detects a vibration for use in the blur 
prevention display and the correction of blur in the correction optical 
device. Numeral 313 denotes a display device which includes the portion 
for the blur prevention display (the display of the blur prevention index) 
in the finder shown in FIGS. 18A and 18B. 
The camera microcomputer 301 receives a signal from the main switch 302, 
the signals s1 and s2 from the release operation element 303, the 
photometry information from the photometry circuit 304 and the distance 
measuring information from the distance measuring circuit 305. Based on 
these signals, the camera microcomputer 301 controls operations of the 
lens focusing driving circuit 306, the shutter circuit 307, the 
stroboscope device 308, the zoom driving circuit 309, the film feeding 
circuit 310, the correction optical device 311, the vibration detection 
sensor 312 and the display device 313. 
Also, the camera microcomputer 301 receives necessary information from the 
circuits and devices described above: for example, position information of 
the photographing lens and rotation information of a focusing-lens drive 
motor from the lens focusing driving circuit 306; an opening quantity of 
the shutter from the shutter circuit 307; a feeding quantity of the 
photographing lens from the zoom driving circuit 309; a feeding condition 
of the film and a load of a feeding motor from the film feeding circuit 
310; position (displacement) information from the correction optical 
device 311; and a vibration applied to the camera from the vibration 
detection sensor 312. 
Further, the camera microcomputer 301 makes the display device 313 display 
conditions of the aforementioned plural circuits and devices, further 
vibrating conditions thereof. If necessary, the stroboscope device 308 is 
made to emit a light and compensate for the luminous energy at the time of 
photographing. 
FIGS. 25 and 26 show a flowchart of a sequence of operation in the camera 
microcomputer 301. When the main switch 302 is turned on, the flow of 
operation is started. Additionally, a timer in the camera microcomputer 
301 is started to count time until time t1 is reached. The timer is 
hereinafter referred to as the timer t1, and other times are referred to 
in the same manner. The timer t1 is used for automatically turning off the 
main switch 302 when the camera is left unoperated with the main switch 
302 kept on. 
As aforementioned, after the main switch 302 is turned on, at step #401 the 
photographing lens whose barrel has been stored in a camera body is fed by 
the zoom driving circuit 309. At this time, a lens barrier for protecting 
the photographing lens is also opened. At the next step #402, the display 
device 313 is turned on to display each functional condition and 
photographing information of the camera (they are usually displayed on a 
surface of the camera body or in the camera finder). At the subsequent 
step #403, the vibration detection sensor 312 provided for detecting the 
blurring from the hand vibration on the camera is turned on to start the 
detection. 
Subsequently, it is determined at step #404 whether or not zooming is 
tele-operated (to lengthen a focal length). As not shown in FIG. 23, a 
condition of a zoom switch for zooming is also transmitted to the camera 
microcomputer 301. If the tele-operation of zooming is performed, the 
process advances to step #405, where the photographing lens is tele-driven 
via the zoom driving circuit 309. Also, at this time the timer t1 is 
reset. Not only during the zoom operation, but also every time another 
operation switch provided on the camera is operated, the timer t1 is 
reset. Specifically, every time the operation is performed, the timer t1 
for turning off the main switch 302 is reset. As long as the operation is 
continued, however, the main switch 302 of the camera is not turned off. 
When at the step #404 the zooming tele-operation is not performed, the 
process advances to step #406, where it is determined whether or not a 
wide-operation of zooming is performed (to shorten the focal length). If 
the zooming wide-operation is performed, the process advances to step 
#407, where the photographing lens is driven in a zoom-wide direction via 
the zoom driving circuit 309. Also, in the same manner as aforementioned, 
the timer t1 is reset. Needless to say, the photographing lens is 
protected in such a manner that the photographing lens is prevented from 
being driven when the photographing lens already positioned in a zoom wide 
driving end or a zooming tele-driving end is further driven toward the 
end. 
At the next step #408, it is determined whether or not the signal s1 is 
generated by half pushing the release operation element 303. If the signal 
s1 is not generated, the process advances to step #409, where it is 
determined whether or not a value of the timer t1 reaches t0 or more or 
the main switch 302 is turned off. When it is determined that the 
photographing person will not use the camera, i.e., when the main switch 
302 is turned off or the camera is not operated for t0, e.g., four minutes 
and it is determined that the camera is left unoperated, then the process 
goes to step #427. 
At the step #427, the vibration detection sensor 312 is turned off. Then at 
step #428, in reverse to the step #401, the barrel of the photographing 
lens is collapsed and stored in the camera body, and simultaneously the 
lens barrier is closed. At the next step #429, the display on the display 
device 313 is turned off, thereby completing a series of operation. 
Also, when at the step #409 the timer t1 does not reach t0 or the main 
switch 302 is on, the process returns to the step #404. The operation of 
the steps #405 to #409 is repeated. 
Additionally, the flowchart of FIG. 25 show only the conditions of the zoom 
operation switch (not shown), the main switch 302 and the release 
operation element 303. However, needless to say, the actual flow of 
operation is interrupted by conditions of the other operation elements, 
for example, an operation switch for changing a stroboscope mode and the 
display thereof. 
When it is determined at the step #408 that the signal s1 is generated by 
half pushing the release operation element 303, the process goes to step 
#410. At the step #410, a timer t2 for counting time (independent of the 
timer t1) until time t2 is reached is started. At the next step #411, the 
photometry of an object is started by the photometry circuit 304. When the 
photometry is completed, the process advances to step #412, where a 
distance to the object is measured (distance measuring is started) by the 
distance measuring circuit 305. When the distance measuring is completed, 
the process goes to step #413. Then, at the step #413 the photographing 
lens is focused via the lens focusing driving circuit 306. When the 
focusing driving is completed, the process goes to step #414. 
At the step #414, the correction lens of the correction optical device 311 
is centered on the optical axis of the photographing lens. Usually, the 
optical axis of the correction lens coincides with the optical axis of the 
photographing lens. At this step when the optical axis of the correction 
lens is deviated from the optical axis of the photographing lens, they are 
aligned with each other to obtain a good image. Specifically, the position 
of the correction lens is detected by the position detection sensor. When 
the position is not a predetermined position (initial position), the 
correction lens is driven toward the predetermined position. Then, when 
the output of the position detection sensor is a predetermined value or 
reaches the predetermined value, the process goes to step #415. On the 
display device 313 the blur prevention display is turned on. Specifically, 
the blur prevention index 153 is displayed to inform the photographing 
person of the blur prevention condition. Then, the process goes to step 
#416 in FIG. 26. 
At the step #416 of FIG. 26, the camera microcomputer 301 is on standby 
until the signal s2 is generated by fully pushing the release operation 
element 303. When to perform an exposure the release operation element 303 
is fully pushed to generate the signal s2, the process goes to step #417 
for stopping the timer t2. At the next step #418, the timer t2 is compared 
with a predetermined time T (e.g., 200 msec). When t2&gt;T, the process goes 
to step #420. Subsequently, at the step #420 the correction optical device 
311 is started for blur correction. 
At the step #418, when it is determined that "t2&lt;T" or "t2=T" (a generation 
interval between the signals s1 and s2 is shorter than the time T because 
the release operation element 303 is fully pushed at one stroke), the 
process advances to step #419. The blur prevention display is changed, for 
example, by flickering the blur prevention index 153 or otherwise, to give 
notice of the blurring from the hand vibration. In this case, 
specifically, when "t2&lt;T" or "t2=T", the correction optical device 311 is 
inhibited from performing the blur correction. A reason why the blur 
correction is not performed when the release operation element 303 is 
fully pushed at one stroke will be described. 
When the release operation element 303 is fully pressed at one stroke, the 
camera is largely vibrated to the pressing direction. A frequency 
component of the vibration is lower (e.g., 500 mHz) as compared with a 
frequency component of the vibration from the hand vibration on the 
camera. Therefore, in some case the vibration detection sensor 312 cannot 
precisely detect the vibration. 
In this case, when an angular velocity is detected by the vibration 
detection sensor 312, its output is integrated through arithmetic 
operation. By using the output as a target value, the correction lens is 
driven. Alternatively, an angular velocity obtained from a mechanical 
property of the correction lens is mechanically integrated. The movement 
of the correction lens indicates an angle of the vibration from the hand 
vibration. The vibration and the vibration applied to the camera are 
counterbalanced. In this blur prevention system, because of its limitation 
of integrability, the vibration with an extremely low frequency is not 
precisely integrated. (Phase is deviated from the actual vibration from 
the hand vibration. For details, refer to the Japanese Patent Application 
Laid-open No. 63-275917). 
If the blur correction is performed with the inferior blur correction 
precision (the blur correction is performed in the phase deviated from the 
actual blurring from the hand vibration), an image is in some case formed 
worse as compared with an image before the blur correction is performed. 
Therefore, by detecting an interval between the half pushing and the full 
pushing of the release operation element 303, i.e., the time interval 
between the signals s1 and s2, it is determined whether or not the 
aforementioned vibration different in property is generated by strongly 
pushing the release operation element 303. The blur correction is thus 
inhibited. 
After the operation of the step #419 or #420 is completed, the process 
advances to step #421, where a shutter (not shown) is controlled to open 
or close via the shutter circuit 307, thereby performing an exposure on 
the film. As not detailed in the flowchart of FIG. 26, actually at the 
step #421, after the shutter is opened by the quantity and time which are 
determined from the photometry information obtained by the photometry 
circuit 304, the shutter is closed. The exposure on the film is then 
completed. Also, during the exposure on the film, the blur correction is 
not stopped even if an operation for turning off the blur prevention 
system (constituted of the correction optical device 311 and the vibration 
detection sensor 312) is performed (when the camera is provided with an 
operation element with which the photographing person turns off the blur 
prevention system). This function is provided for preventing the image 
from being deteriorated by the behavior of the correction lens when the 
blur correction is stopped during the exposure. This is also a 
countermeasure for the case in which the blur prevention system is turned 
off by mistake during the exposure. 
At the next step #422 it is determined whether or not the blur correction 
is being performed. When the blur correction is not performed (the process 
goes to the step without passing the step #420), the process immediately 
advance to step #424. On the other hand, when the blur correction is 
performed, the process advances to the step #423. The blur correction by 
means of the correction optical device 311 is completed. Thereafter, the 
correction lens is centered (in the same manner as the step #414), and the 
process advances to step #424. 
At the step #424 the blur prevention display on the display device 313 is 
turned off. Additionally, as aforementioned, the blur prevention is 
displayed in the finder as the blur prevention index in accordance with 
the actual vibration. The photographing person can confirm the blur 
prevention condition through the finder. At the subsequent step #425 a 
photographed frame is advanced via the film feeding circuit 310, so that 
the next frame to be photographed is placed in a photographing position. 
Then, the process advances to the step #426 to reset the timer t1, and 
then returns to the step #404. Additionally, at the step #426 the timer t1 
is reset because the main switch 302 is prevented from being automatically 
turned off when the timer t1 counts up time. 
In the aforementioned flow of operation, only at the step #409 of FIG. 25, 
the condition of the main switch 302 is observed. Actually, the main 
switch 302 is observed everywhere. For example, even when the main switch 
302 is turned off for a long time during the exposure, the camera can 
accept that. 
Here, in some case a slight time (about one second) is necessary from when 
the blur prevention system, especially the vibration detection sensor 312 
is turned on till its output is stabilized. If photographing is performed 
during the time, blur correction cannot be properly performed. 
Additionally, the image is deteriorated in some case (because of a wrong 
signal from the vibration detection sensor 312). To prevent this, in the 
sequence of camera operation, the photographing is inhibited until the 
vibration detection sensor 312 is stabilized. 
FIG. 27 is a flowchart only of a portion relating to the aforementioned 
countermeasure in the camera microcomputer 301. The flow of operation is 
started when the main switch 302 is turned on and the vibration detection 
sensor 312 starts operating. Specifically, the operation is started on and 
after the step #403 of FIG. 25. 
First, at step #501 a timer t3 is started for counting a time t3 until the 
vibration detection sensor 312 is stabilized. At the next step #502 the 
output of the vibration detection sensor 312 is checked. If its output is 
smaller than a predetermined value, the process immediately advance to 
step #504, but its output exceeds the predetermined value. Specifically, 
when the vibration becomes heavy, the process advances to step #503 to 
reset the timer t3, then returns to the step #502. That is to say, it 
takes time until the vibration detection sensor 312 is again stabilized 
because the arithmetic operation in the vibration detection sensor 312 is 
saturated when the vibration becomes heavy to some degree. 
At the next step #504, the process is on standby until the signal s1 is 
generated by half pushing the release operation element 303. When the 
signal s1 is generated, the process advances to step #505. Then, at the 
step #505 a time (hereinafter referred to as the time t3) from when the 
timer t3 starts counting till the release operation element 303 is half 
pushed is held. At the subsequent step #506 the time t3 is compared with a 
predetermined time Tx. Since a necessary blur prevention precision changes 
with a zooming or shutter speed, the time Tx is variable accordingly. For 
example, when zooming tele-operation or shutter speed is retarded, the 
blur prevention precision needs to be raised. Then, the time Tx is set 
longer as 1.5 seconds. When t3&gt;Tx, the process advances to step #507, 
where the process is on standby until the signal s2 is generated by fully 
pushing the release operation element 303. When the signal s2 is 
generated, the process advances to step #508, thereby performing the 
exposure. At this time, the vibration detection sensor 312 is sufficiently 
stabilized (because t3&gt;Tx). During the exposure, the correction optical 
device 311 is performing the blur correction. 
Also, when it is determined at the step #506 that the relationship "t3&gt;Tx" 
is not given, the vibration detection sensor 312 is not stabilized yet. 
Therefore, the exposure cannot be allowed. The process advances to step 
#509, where it is determined whether or not the signal s1 is again 
generated by the release operation element 303. As a result, if the signal 
s1 is generated, the process stays at the step. Specifically, as long as 
at the step #509 the signal s1 is generated by the release operation 
element 303, the photographing cannot be performed. 
Thereafter, when it is determined at the step #509 that the signal s1 is 
not generated by the release operation element 303 (the photographing 
person releases the release operation element 303), the process advances 
to step #510 to release the held timer t3. Thereby, the timer t3 resumes 
the counting from the previously counted value. Thereafter, the process 
returns to the step #502. Specifically, when the vibration detection 
sensor 312 is not stabilized, the process does not advance from the step 
#506 to the step #507 of the exposure operation even if the release 
operation element 303 is fully pushed. The process is thus in a release 
lock condition. In the condition, even if the release operation element 
303 continues to be pushed, the photographing cannot be started. To 
perform the photographing, the photographing person once releases the 
release operation element 303, then again tries to half (to generate the 
signal s1) or fully (to generate the signal s2) push the release operation 
element 303 (of course, on the condition that "t3&gt;Tx"). Then, the 
photographing can be performed. 
Specifically, the release lock condition cannot be canceled until the half 
pressed release operation element 303 is released. 
The release operation element 303 is usually constituted of a known push 
switch. When the release operation element 303 is pushed by one stage, the 
signal s1 is generated. When it is further pressed (pushed by two stages), 
the signal s2 is generated. In this case, if the vibration detection 
sensor 312 is not stabilized (immediately after the main switch 302 is 
turned on or when the vibration detection sensor 312 receives a heavy 
vibration and again returns to its stabilized condition), then the release 
lock continues until the vibration detection sensor 312 is stabilized. If 
the release lock is canceled with the release operation element 303 being 
fully pushed, the photographing person has to perform photographing at an 
unintended timing in the same manner as the case in which a release time 
lag is lengthened. A photograph is taken at an undesirable photographing 
opportunity. Also, in the release lock condition, the photographing person 
tends to strongly depress the release operation element 303 without 
noticing the condition. This operation causes a heavy vibration to a 
degree which cannot be controlled in the blur prevention system. 
Additionally, if photographing is performed by canceling the release lock 
at such a timing, the image is largely deteriorated. 
Considering from the aforementioned, the flow of operation in FIG. 27 is 
set in such a manner that the release lock condition cannot be canceled 
until the release operation element 303 is once released and the camera 
(vibration detection sensor 312) is stabilized. 
The sequence of camera operation has been described on the condition that 
the blur prevention system is used. Depending on the condition of the 
camera, however, the blur prevention system is not operated in some case. 
A sequence of camera operation for this case is shown in FIG. 28. 
The flow of operation in FIG. 28 is started when the main switch 302 is 
turned on. First at step #601 a setting is formed for performing a blur 
prevention display at the step #415 of FIG. 25. Here, the blur prevention 
display is not performed, but it is temporarily determined whether or not 
the blur prevention display is performed when the process goes to the step 
#415. 
At the next step #602 it is determined whether or not the stroboscope 
device 308 is being electrically charged (referred to as the stroboscope 
charge). During the stroboscope charge, the process advances to step #606. 
When the stroboscope charge is completed, the process advances to step 
#603. At the step #603 it is determined whether or not a remote control or 
a self timer of the camera is being operated. During operation, the 
process advances to step #606. If it is not operated, the process advances 
to step #604. 
It is determined at the step #604 whether or not a normal stroboscope 
photographing is performed (excluding a slow synchronous photographing or 
another case where the stroboscope device 308 is operated at a slow 
shutter speed). If the normal stroboscope photographing is performed, the 
process advances to step #606. If not, the process advances to step #605. 
At the step #605 it is determined whether or not a super slow (e.g., two 
seconds) shutter is operated. If the super slow shutter is operated, the 
process advances to step #606. If not, the process advances to step #607. 
At the step #606, a setting is formed for not performing the blur 
prevention display at the step #415 of FIG. 25 (the setting of the step 
#601 is canceled). 
At the step #607, it is determined whether or not a product A of shutter 
speed and zoom information (for example, when the shutter speed is 1/60 
and a zoom focal length is 100 mm, A is 1.67) is smaller than A.sub.0 
(e.g., "1"). If A&lt;A.sub.0, e.g., the product A is smaller than "1", the 
process advances to step #609, where a setting is formed for turning off a 
blur correction driving of the correction optical device 311 at the step 
#420 of FIG. 26. On the other hand, if the product A is "1" or more, the 
process advances to step #608, where a setting is formed for turning on 
the blur correction driving of the correction optical device 311 at the 
step #420 of FIG. 26. Thereafter, the process returns to the step #601. 
In the aforementioned flow of operation, during the stroboscope charge and 
when no allowance is left in the power supply, the correction optical 
device 311 is not operated. (In this case, functions other than the blur 
prevention cannot be used.) 
Also, when the remote control or the self timer is used, the blur 
correction is not performed. Specifically, when the remote control or the 
self timer is operated, the camera is attached to a tripod or fixed 
otherwise. Since the camera is thus operated while no blurring from a hand 
vibration is caused, the blur correction is unnecessary. When the camera 
is firmly fixed to the tripod or the like, however, a shock of shutter 
driving at the time of camera operation or the like is transmitted to the 
vibration detection sensor 312, and the vibration detection sensor 312 is 
wrongly operated. Thereby, a blur correction precision is deteriorated. 
Also, there is a possibility that an image becomes worse as compared with 
an image when no blur correction is performed. 
At the time of the normal stroboscope photographing, no blur correction is 
performed. Because a light emitting time of the stroboscope to the object 
is remarkably short, for example, 500 msec, and during such a short time 
the image is hardly influenced by the hand vibration on the camera. 
Additionally, even during the stroboscope photographing, in the case of the 
slow synchronization the blur correction is performed to prevent the image 
from being deteriorated. Since the shutter speed is determined based on 
the photometry information of the object, in the case of a dark subject, a 
slow shutter results. In the condition, if a light is emitted from the 
stroboscope for photographing, the object is properly exposed to the 
stroboscope light. Even a background to which no stroboscope light reaches 
can be clearly photographed because of the slow shutter. However, in the 
case of the slow shutter, if no tripod is used, the photographing is 
usually influenced by the blurring from the hand vibration. 
In the case of the super slow shutter, for example, when the focal length 
is 150 mm, the shutter speed is one second. When the focal length is 30 
mm, the shutter speed is four seconds or longer. When the shutter speed is 
slow, no blur correction is performed. This is because in the super slow 
shutter a remarkably low frequency component is included, and, as 
aforementioned, the blur correction cannot be performed precisely because 
of the limitation in integrability of the vibration detection sensor 312. 
Also, the output of the vibration detection sensor 312 also includes an 
output drift with a remarkably low frequency. In the case of the super 
slow shutter, the output drift also influences and deteriorates the image. 
As aforementioned, during the stroboscope charge, when the remote control 
or the self timer is used, during the normal stroboscope photographing, or 
when the super slow shutter is used, then no blur correction is performed 
(because the step #609 is passed). Additionally, as described in the step 
#606, the setting for not performing the blur prevention display is 
formed. Therefore, the photographing person is informed that no blur 
correction is performed, and is reminded that the camera needs to be 
securely held. 
When the product of the shutter and the zoom is smaller than the 
predetermined value, no blur correction is performed, because the image is 
hardly influenced and deteriorated by the hand vibration on the camera. 
However, although no blur correction is performed, the blur prevention 
display is performed (because the step #606 is not passed). Specifically, 
the determination is automatically made at the step #607. Then, with a 
change in camera framing (this results in a change in brightness of the 
object and, therefore, the shutter speed changes), the blur correction 
function is frequently switched on or off. It is undesirable that the blur 
prevention display also frequently turns on or off. Also, different from 
the aforementioned four conditions in which no blur prevention display is 
performed, it is not important to let the photographing person informed 
that the blur correction is not performed. Even if the photographing 
person is not informed, the image is not deteriorated. In this case, 
however, if the blur prevention display is turned off, the photographing 
person cannot understand the reason and feel uncomfortable. 
Additionally, when it is determined at the step #607 that the blur 
correction is unnecessary, the release lock shown in FIG. 27 is not 
performed unconditionally. Therefore, a quick photographing performance of 
the camera is improved. Specifically, at the time of the zooming 
wide-operation, at the time of the operation at a quick shutter speed or 
at the time of a combination of these operations, the blur correction is 
unnecessary. In this case, immediately after the main switch 302 is turned 
on, photographing can be performed. Even if there is a heavy vibration 
before the photographing, the release lock does not occur. 
It is important in the flow of the operation to form the setting for not 
performing the blur correction at the step #609. The blur correction 
function is unoperated simply by not transmitting the blur correction 
target value to the correction optical device 311. The vibration detection 
sensor 312 remains operative, and all the other functions regarding the 
blur prevention (excluding the display) are operative. 
Therefore, the blur correction can be immediately turned on or off, for 
example, at the determination step #607 or in another case where the blur 
prevention system is frequently switched to be necessary or unnecessary 
(because of the change in shutter speed or the like caused by the framing 
change). Specifically, if all the elements of the blur prevention system 
are turned on or off frequently, the stand-by time is necessary after each 
element is raised until the element is stabilized. The maneuverability of 
the blur prevention system is thus deteriorated. The correction optical 
device 311 can be immediately turned on because its constant at the time 
of operation is small. Therefore, when the blur prevention system is not 
used, instead of turning off all the elements of the system, only the 
correction optical device 311 is unoperated (simply by not transmitting 
the blur correction target value to the correction optical device 311). 
As aforementioned, it is undesirable to turn off all the elements of the 
blur prevention system (especially the vibration detection sensor 312), 
because when the blur prevention system is again used, it takes time until 
the system is stabilized. For this, if possible, the constitutional 
elements of the blur prevention system except the correction optical 
device 311 are operated while the main switch 302 of the camera is turned 
on. 
FIG. 29 shows a relationship between the sequence and the blur prevention 
system of the camera. 
As aforementioned, in the conventional system, no countermeasure is taken 
against an unusual vibration at the time of the camera operation (for 
example, the release operation, the zoom operation and the like) except 
the vibration of the hand vibration on the camera. In the embodiment, 
however, based on a difference in operation time between the half 
switching on and the full switching on of the release operation element 
303 (the value of the timer t2), the blur correction is controlled to be 
operated or unoperated. Specifically, when the operation time difference 
is within the predetermined time, no blur correction is performed or the 
blur correction is discontinued (at the steps #418 to #419 in FIG. 26). 
Therefore, when a heavy vibration with a low frequency is applied by 
switching on the release operation element 303 at one stroke, the blur 
prevention system is prevented from being wrongly operated. Further, no 
image deterioration arises. 
Also, the display of the blur prevention system is controlled based on the 
operation time difference. That is to say, the notice of the blurring from 
the hand vibration is given when the operation time difference is within 
the predetermined time. Thereby, the photographing person can judge 
whether or not to perform the photographing again, and never misses a 
shutter release chance without knowing a failure in photographing. 
Also, as shown in FIG. 27, in the arrangement of the embodiment, even when 
the release operation element 303 is not half switched on, the release 
lock is performed until the blur prevention system (vibration detection 
sensor) is properly operated. The release lock is continued until the half 
switching-on of the release operation element 303 is once canceled and the 
element is again operated. Therefore, the photographing is prevented from 
being performed at a photographing person's undesirable opportunity by 
canceling the release lock unintentionally. Further, the image is 
prevented from being deteriorated by a heavy vibration due to the release 
lock (the vibration results when to fully switch on the element, the 
element is strongly pressed). 
As shown in FIG. 28, at the time of photographing, in the case of the fast 
shutter speed or in another case, the correction optical device 311 is 
brought in an unoperated condition, but the vibration detection sensor 312 
remains operated. Therefore, a time loss resulting from the rising of the 
blur prevention system is eliminated at the time of operation. Further, 
the maneuverability of the camera can be enhanced. 
Also, for example, even when the shutter speed is fast and the correction 
optical device 311 is unoperated, the blur prevention display is 
performed. Specifically, when the blur correction is automatically turned 
on or off in accordance with the shutter speed, the display device 313 for 
blur prevention is not controlled (although the blur correction is not 
performed, the blur prevention display is performed) at the steps #607 to 
#609 (#606 is not passed) in FIG. 28. Therefore, a discomfort resulting 
from an unnecessary change in display is not given to the photographing 
person. 
Further, the conventional correction optical device is large-scaled. To 
mount the device onto the camera, the camera itself needs to be enlarged. 
For the compact camera, however, it is a critical defect to be large and 
heavy. Further, since the structure is complicated, both component cost 
and assembly cost are increased. The conventional correction optical 
device has a large number of defects and is undesirable as a household 
product. However, according to the correction optical device constituted 
as shown in FIG. 21, the aforementioned defects can be eliminated. 
Further, in the conventional blur prevention system mounted on a single 
lens reflex camera, since in a TTL system the photographing person can 
point at the object through the photographing lens, it can be recognized 
through the finder that the blur correction is actually performed. In the 
compact camera, however, the photographing lens (for blur correction) and 
the finder lens with which the photographing person confirms the object 
are exclusively used, respectively. Therefore, the operation of the blur 
prevention system cannot be seen through the finder. (Of course, by 
mounting another correction optical device on the finder system, the 
condition of the blur correction can be known. In this case, the camera is 
enlarged and its cost is increased.) Therefore, in some case photographing 
is performed without confirming the operational condition of the blur 
prevention system. The photographing is performed while the blur 
correction is not sufficiently made. Further, a new function of the blur 
prevention system is mounted on the camera, but that is not satisfactorily 
persuasive for users. Also in this respect, by providing the camera with 
the finder optical device on which the blur prevention display is possible 
as shown in FIG. 16, the aforementioned problem can be solved while the 
camera is kept compact. 
Further, the user is requested to operate the additional blur prevention 
system. Also, the blur prevention system transmits the blur prevention 
condition and another information to the user. Then, there is a 
possibility that the operation of the camera is complicated and difficult 
for the user. However, it is automatically determined whether or not to 
use the blur prevention system. Additionally, at the time of blur 
correction it is recognized by the display in which direction and how much 
there is caused a blurring. Therefore, the relevant problem can also be 
solved. 
(Fourth Embodiment) 
FIG. 30 is a perspective view showing a finder display device according to 
a fourth embodiment of the invention. In FIG. 30, the same portion as in 
FIG. 16 is denoted with the same numerals, and the description thereof is 
omitted. 
In FIG. 30, numeral 154 denotes an LED or another light source, and 155 
denotes a pitch vibration detection sensor (vibration gyroscope) for 
detecting a vibration in a pitch direction of the camera. The pitch 
vibration detection sensor 155 is constituted of fixing portions 155a to 
be fixed with screws or the like onto a bottom board (not shown), a mask 
portion 155b in which two parallel thin transmitting portions are formed 
on a perpendicularly bent and raised tip end of a vibrator, a 
piezoelectric element 155c placed adjacent to a root of the vibrator for 
detecting Coriolis force, magnets 155d placed on opposite faces of the 
vibrator, a coil 155e fixed to the bottom board (not shown) in a vicinity 
of the magnets 155d and a photo reflector or another position sensor 155f 
for detecting a vibration position of the vibrator. 
When a predetermined electric current is passed through the coil 155e, the 
vibrator with the magnets 155d placed thereon is vibrated at a 
predetermined frequency along the vertical direction of the camera. 
Additionally, the mask portion 155b is disposed in such a manner that the 
longitudinal direction of the transmitting portions is perpendicular to 
the vibrating direction of the vibrator. 
Numeral 156 denotes a yaw vibration detection sensor for detecting a 
vibration in a yaw direction of the camera. The yaw vibration detection 
sensor 156 is constituted of fixing portions 156a to be fixed with screws 
or the like onto the bottom board (not shown), a mask portion 156b which 
is formed by raising perpendicularly from a side and bending a tip end of 
a vibrator and forming a rectangular transmitting portion substantially in 
a middle of a face of the tip end, a piezoelectric element 156c placed 
adjacent to a root of the vibrator for detecting Coriolis force, magnets 
156d placed on opposite faces of the vibrator, a coil 156e fixed to the 
bottom board (not shown) in a vicinity of the magnets 156d and a photo 
reflector or another position detection sensor 156f for detecting a 
vibration position of the vibrator. 
When a predetermined electric current is passed through the coil 156e, the 
vibrator with the magnets 156d placed thereon is vibrated at a 
predetermined frequency along an optical-axis direction of the camera. 
Additionally, the longitudinal direction of the mask portion 156b is set 
perpendicular to the vibrating direction of the vibrator. 
Numeral 157 denotes an image forming lens with which an image formed by the 
light source 154, the mask portion 155b of the pitch vibration detection 
sensor 155 and the mask portion 156b of the yaw vibration detection sensor 
156 is formed onto a vicinity of a finder image forming face. 
In the arrangement described above, when a light from the light source 154 
is passed through the mask portion 155b of the pitch vibration detection 
sensor 155, two thin parallel photo images are formed. The two thin 
parallel photo images are further passed through the mask portion 156b of 
the yaw vibration detection sensor 156, and have their lengths restricted 
by short sides of the rectangular transmitting portion of the mask portion 
156b. Then, the photo images are passed through the image forming lens 157 
and the half mirror 149, and formed on the vicinity of the finder image 
forming face. 
The photographing person can observe an object overlapping the blur 
prevention index 153 on the half mirror 149. 
When the pitch vibration detection sensor 155 is vibrated, the mask portion 
155b is vibrated vertically. Therefore, when the light source 154 is 
allowed to continuously emit lights, the blur prevention index 153 is 
vibrated in the pitch direction (vertically). 
Additionally, when the yaw vibration detection sensor 156 is vibrated, the 
mask portion 156b is vibrated perpendicularly to the vibrating direction 
of the mask portion 155b of the pitch vibration detection sensor 155. 
Therefore, when the light source 154 is allowed to continuously emit 
lights, the transmitting position of the mask portion 156b is changed in 
the longitudinal direction of the two thin parallel photo images. The blur 
prevention index 153 appears to vibrate in the yaw direction (laterally). 
Additionally, also in the fourth embodiment of the invention, in the same 
manner as in the third embodiment, by controlling the light source 154 at 
the light-on timing as shown in FIG. 17, the display in the finder image 
plane as shown in FIGS. 18A and 18B is possible. 
The third and fourth embodiments provide following effects: 
1) The vibrators of the pitch vibration detection sensor 143 or 155 and the 
yaw vibration detection sensor 144 or 156 are vibrated at different 
frequencies. In accordance with the vibrations, the light-on timing of the 
light source 141 or 154 is controlled. Therefore, the light from the light 
source 141 or 154 can be moved and displayed in the finder image plane. 
Additionally, the blur prevention index 153 can be displayed on an 
optional position of the finder image plane. The blur prevention index 153 
can be continuously moved. 
Also, the light-on timing of the light source 141 or 154 is controlled by 
the vibrations of the vibrators of the pitch vibration detection sensor 
143 or 155 and the yaw vibration detection sensor 144 or 156 and 
additionally by vibration information obtained from these sensors. 
Therefore, in the finder image plane, the blur prevention index 153 can be 
moved and displayed in the direction reverse to the vibrating direction of 
the camera. Thereby, in the finder image plane, the blur prevention index 
153 is continuously moved for the blur correction. Therefore, the blur 
prevention effect can be recognized intuitively. 
Also, the pitch vibration detection sensor 143 or 155 and the yaw vibration 
detection sensor 144 or 156 transmit the vibration information to the 
correction optical device for correcting the vibration applied to the 
camera. As aforementioned, the actuators of these sensors also serve as 
actuators for the display of the blur prevention index 153. Consequently, 
an inexpensive and space-saving finder display device can be provided, and 
this can be easily applied to the compact camera. 
As aforementioned, according to the third and fourth embodiments of the 
invention, the light projected by the light projecting means is directed 
in a two-dimensional direction in the finder image plane by using the 
excitation of the first and second vibrating means. Based on the 
excitation information of the first and second vibrating means which are 
excited at different frequencies, the light projection timing of the light 
projecting means is controlled, so that the index is displayed in the 
finder image plane. In an inexpensive and simple arrangement, the index 
with a good visibility can be moved and displayed on the optional position 
in the finder image plane. 
Also, according to the third and fourth embodiments of the invention, the 
light projected by the light projecting means is guided in the 
two-dimensional direction in the finder image plane by the reflecting 
portions of the first and second vibrating means. Alternatively, the light 
from the light source is guided through the restricting portions of the 
first and second vibrating means in the two-dimensional direction in the 
finder image plane. Based on the excitation information of the first and 
second vibrating means which are vibrated at different frequencies and the 
vibration information obtained from the vibration detection means, the 
light projection timing of the light projecting means is controlled. Then, 
the index indicative of the vibrating condition is displayed in the finder 
image plane. Therefore, in the inexpensive and simple arrangement, the 
index indicative of the vibrating condition with a good visibility can be 
moved, displayed and recognized in the finder image plane. 
Also, according to the third and fourth embodiments of the invention, by 
using the vibrators of the first and second vibration sensors for 
detecting the vibrations in the first and second directions of the optical 
device, the index can be moved and displayed in the finder image plane. 
Therefore, the vibrating condition can be recognized with a good 
visibility. The optical device having an inexpensive and simple 
arrangement can be provided. 
(Fifth Embodiment) 
FIG. 31 is an explanatory view of a light-on timing of a light source for 
displaying a blur prevention index in a finder image plane of a finder 
display device which is mounted on a compact camera according to a fifth 
embodiment of the invention. This corresponds to FIG. 17 in the third 
embodiment. Additionally, numerals 161 to 165 denote the same components 
as in FIG. 17, and the description thereof is omitted. 
FIG. 32 is a flowchart showing an operation sequence when a blur prevention 
effect is displayed in a finder image plane by the finder display device. 
Additionally, a circuit arrangement of the finder display device is the 
same as in FIG. 19. 
When a main sequence of the camera is started by, for example, turning on a 
camera main switch, in a series of operations for an initial process, the 
MPU 181 shown in FIG. 19 reads from the EEPROM 183 a parameter regarding 
the display of the blur prevention index 153 on the finder, and stores the 
parameter into a predetermined address of the memory 182 (#751). 
When IS (blur prevention) is started, for example, by half switching on a 
release operation element (YES at #752), a variable for use in processing 
is initialized. The MPU 181 thus reads from the A/D conversion input 
terminal an output of the vibration detection sensor 186 for detecting the 
vibration in the pitch direction (#753). 
Thereafter, an offset and a gain are adjusted (#754). For the offset 
adjustment, deviations in offsets of the vibration detection sensor 186 
and the position detection sensor 187 passed through the amplification 
circuits 190 and 191 are corrected when the vibration detection sensor 186 
for detecting the vibration and the position detection sensor 187 for 
detecting the position of the vibrator of the vibration detection sensor 
186 are unoperated (the vibrator of the vibration detection sensor 186 is 
stopped and outputs of the vibration detection sensor 186 and the position 
detection sensor 187 are set to zero). 
Also, for the gain adjustment, if signals of the vibration detection sensor 
186 and the position detection sensor 187 obtained from the amplification 
circuits 190 and 191 are compared as they are, even after the offset 
adjustment, the actually visible blur prevention effect is deviated from 
an observer's sense. To correct the deviation, the gain adjustment is 
performed. Specifically, even if the signals of the vibration detection 
sensor 186 and the position detection sensor 187 obtained from the 
amplification circuits 190 and 191 have equal values, the actual blur 
quantity on the finder is not necessarily equal to the position of the 
vibrator of the vibration detection sensor 186 at the moment. Therefore, 
through the gain adjustment, the output of the vibration detection sensor 
186 is converted to the blur quantity on the finder. Then, the blur 
prevention index is displayed on the position of the vibrator of the 
vibration detection sensor 186 which is equal to the blur quantity. 
In the actual processing of the MPU 181, the offset and gain are adjusted 
in a following equation: 
EQU Gp=AMPp(Gp'-OFFSETp) 
In the equation, Gp is an output of the vibration detection sensor 186 
after the adjustment, and Gp' is an output of the vibration detection 
sensor 186 before the adjustment. Constants for the offset and gain 
adjustments are represented by OFFSETp and AMPp, which are both prestored 
in the EEPROM 183. A value of OFFSETp is obtained as a difference in 
output between the vibration detection sensor 186 and the position 
detection sensor 187 when they are unoperated, and stored in the EEPROM 
183. The constant AMPp is used when the output of the vibration detection 
sensor 186 is converted to the blur quantity on the finder, so that the 
blur prevention index is displayed on the vibrator position of the 
vibration detection sensor 186 which is equal to the quantity. The 
constant is experimentally obtained and stored in the EEPROM 183. 
If a value of Gp is larger than the vibration width of the vibrator of the 
vibration detection sensor 186, the value of Gp is substituted for values 
on its opposite ends. Specifically, the output value of the position 
detection sensor 187 for detecting the position of the vibrator is set in 
a range from PRpmin to PRpmax. When the value of Gp is less than PRpmin: 
EQU Gp=PRpmin 
Also, when the value of Gp exceeds PRpmax: 
EQU Gp=PRpmax 
As shown in FIGS. 18A and 18B, the blur prevention index 153 is displayed 
based on the output relationship shown in FIG. 31. This prevents the 
problem that the blur prevention index 153 is not displayed in the finder 
image plane when the value of Gp is larger than the vibration width of the 
vibrator of the vibration detection sensor 186. 
The output Gp of the vibration detection sensor 186 after the offset and 
gain adjustments is obtained in this manner, and stored in the memory 182 
(#755). 
Subsequently, the output PRp of the position detection sensor 187 for 
detecting the position of the vibrator of the vibration detection sensor 
186 in the pitch direction is read from the A/D conversion input terminal 
(#756). Then, it is determined whether or not a tilt of an output signal 
from the position detection sensor 187 is negative (#757). This is 
performed by comparing the previous output from the position detection 
sensor 187 stored in the memory 182 with the presently read output value 
PRp. If the value stored in the memory 182 is an initialized value, it is 
determined that the tilt of the output from the position detection sensor 
187 is not negative. In this manner, when the tilt of the output from the 
position detection sensor 187 is not negative (NO at #757), the process 
returns to the #756 to again read the output from the position detection 
sensor 187 for detecting the vibrator position of the vibration detection 
sensor 186 in the pitch direction from the A/D conversion input terminal. 
Again in the step #757, it is again determined whether or not the tilt of 
the output from the position detection sensor 187 is negative. The process 
is repeated until the tilt of the output from the position detection 
sensor 187 becomes negative. 
Subsequently, when the tilt of the output from the position detection 
sensor 187 becomes negative (YES at #757), the output PRp from the 
position detection sensor 187 at the moment is compared with the output Gp 
of the vibration detection sensor 186 after the offset and gain 
adjustments which is stored in the memory 182 (#758). As a result, when 
the difference is equal to or less than a value of the parameter which is 
read from the EEPROM 183 into the memory 182 in a series of initial 
process, the outputs are regarded as substantially equal. In other words, 
the vibrator of the pitch vibration detection sensor 186 is regarded to be 
in a vibrating condition in which the blur prevention index 153 can be 
displayed in positions of the case where the vibration in the pitch 
direction at the moment is displayed in the image plane (corresponding to 
positions of the outputs 161 and 163 shown by black dots in FIG. 31). 
Then, the process advances to the next step #759. On the other hand, when 
both output values are not regarded as substantially equal (NO at #758), 
the process returns to the step #756 to again read from the A/D conversion 
input terminal the output of the position detection sensor 187 for 
detecting the vibrator position of the vibration detection sensor 186 in 
the pitch direction. The same operation is repeated. 
At the next step #759, the MPU 181 reads from the A/D conversion input 
terminal an output of the vibration detection sensor 188 for detecting the 
vibration in the yaw direction. Thereafter, in the same manner as the 
output of the vibration detection sensor 186 for detecting the vibration 
in the pitch direction, the offset and gain are adjusted (#760). In the 
actual processing of the MPU 181, the offset and gain are adjusted in a 
following equation: 
EQU Gy=AMPy(Gy'-OFFSETy) 
In the equation, Gy is an output of the vibration detection sensor 186 
after the adjustment, and Gy' is an output of the vibration detection 
sensor 186 before the adjustment. Constants for the offset and gain 
adjustments are represented by OFFSETy and AMPy, respectively, which are 
both prestored in the EEPROM 183. A value of OFFSETy is obtained as a 
difference in output between the vibration detection sensor 188 and the 
position detection sensor 189 when they are unoperated, and stored in the 
EEPROM 183. The constant AMPy is used when the output of the vibration 
detection sensor 188 is converted to the blur quantity on the finder, so 
that the index is displayed on the vibrator position of the vibration 
detection sensor 188 which is equal to the quantity. The constant is 
experimentally obtained and stored in the EEPROM 183. 
If a value of Gy is larger than the vibration width of the vibrator of the 
vibration detection sensor 188, the value of Gy is substituted for values 
on its opposite ends. Specifically, the output value of the position 
detection sensor 189 for detecting the position of the vibrator is set in 
a range from PRymin to PRymax. When the value of Gy is less than PRymin: 
EQU Gy=PRymin 
Also, when the value of Gy exceeds PRymax: 
EQU Gy=PRymax 
The output Gy of the vibration detection sensor 188 after the offset and 
gain adjustments is obtained in this manner, and stored in the memory 182 
(#760). 
Subsequently, the MPU 181 reads from the A/D conversion input terminal the 
output PRy of the position detection sensor 189 for detecting the position 
of the vibrator of the vibration detection sensor 188 in the yaw direction 
(#761). Then, the output from the position detection sensor 189 at the 
moment is compared with the output Gy of the vibration detection sensor 
188 after the offset and gain adjustments which is stored in the memory 
182 (#762). As a result, when the difference is equal to or less than the 
value of the parameter which is read from the EEPROM 183 into the memory 
182 in a series of initial process, the outputs are regarded as 
substantially equal. In other words, the vibrator of the yaw vibration 
detection sensor 188 is regarded to be in a vibrating condition in which 
the blur prevention index 153 can be displayed in the positions of the 
case where the vibration in the yaw direction at the moment is displayed 
in the image plane. Then, the process advances to step #763 for displaying 
the blur prevention index 153. On the other hand, when both output values 
are not regarded as substantially equal, the process returns to the step 
#756 to again read from the A/D conversion input terminal the output of 
the position detection sensor 187 for detecting the vibrator position of 
the vibration detection sensor 186 in the pitch direction. 
At the step #763 for displaying the blur prevention index 153, the MPU 181 
outputs an display on signal to the driving circuit 185 (the timing 
corresponds to the light emitting timing 165 shown in FIG. 31). During the 
output of the display on signal, the driving circuit 185 turns on the LED 
184. While the LED 184 is turned on, the blur prevention index 153 is 
displayed on the finder as shown in FIGS. 18A and 18B. 
As aforementioned, the output of the position detection sensor 187 for 
detecting the position of the vibrator in the pitch direction 
substantially equals the output of the vibration detection sensor 186. 
Also, the tilt of the output signal from the position detection sensor 187 
is negative. Then, the output of the position detection sensor 189 for 
detecting the position of the vibrator in the yaw direction substantially 
equals the output of the vibration detection sensor 188. In this case, by 
displaying the blur prevention index 153, the index displayed on the 
finder constantly follows up an object which is observed through the 
finder. Therefore, the blur prevention effect can be confirmed. 
According to the fifth embodiment, the vibrators of the vibration detection 
sensors for detecting the vibrations in the pitch and yaw directions of 
the camera are used as optical path changing members for displaying the 
blur prevention index in the finder. In this case, when the vibrators are 
in the vibrating positions to which the light from the light source can be 
guided via the mask (when the outputs of the vibration detection sensor 
and the position detection sensor are substantially equal to each other), 
a display-on signal is emitted to turn on the light source. Therefore, the 
finder display device can be made inexpensive and compact. Additionally, 
the blur prevention index can be displayed in accordance with the 
vibration in the finder image plane. Consequently, since the blur 
prevention index constantly follows up the object which is observed 
through the finder, the blur prevention effect can be easily confirmed. 
Also, after making the gain and offset adjustments of the outputs of the 
vibration detection sensor and the position detection sensor, the outputs 
are compared with each other to determined whether or not they are 
substantially equal to each other. Further, when the output range of the 
vibration detection sensor exceeds the output range of the position 
detection sensor, an output of an exceeded portion is substituted for a 
maximum or minimum value of the position detection output. Therefore, the 
blur prevention index can be displayed on the position substantially 
corresponding to the actual vibration in the finder image plane. 
Further, for example, first, when the tilt of the output from the position 
detection sensor is positive, the output of the vibration sensor is 
compared with the output from the position detection means. Then, by 
emitting the display-on signal, the light source is turned on. 
Subsequently, when the tilt of the output from the position detection 
sensor is negative, the output of the vibration sensor is compared with 
the output from the position detection sensor. Then, by emitting the 
display-on signal, the light source is turned on. In this case, because of 
a response delay in the display-on signal and light projection timing, the 
display of the blur prevention index appears to be blurred (doubled). 
(When the tilt of the output is positive and negative, the direction of 
the response delay is reversed.) Therefore, only at the timing when the 
output of the position detection sensor has a positive (or negative) tilt, 
the output of the vibration sensor is compared with the output of the 
position detection sensor. 
(Sixth Embodiment) 
FIG. 33 is a flowchart showing an operation sequence when a blur prevention 
effect is recognized by a display on a finder in a finder display device 
which is mounted on a compact camera according to a sixth embodiment. 
Additionally, a circuit arrangement of the finder display device is the 
same as in FIG. 19. In the following description, FIGS. 17 to 19 are used 
as required. 
When a main sequence of the camera is started by, for example, turning on a 
camera main switch, in a series of operations for an initial process, the 
MPU 181 reads from the EEPROM 183 a parameter regarding the display of the 
blur prevention index 153 on the finder, and stores the parameter into a 
predetermined address of the memory 182 (#820). 
When IS (blur prevention) is started, for example, by half switching on a 
release operation element (YES at #821), a variable for use in processing 
is initialized. Additionally, a focal length of the photographing lens at 
the moment is read and stored in a predetermined address of the memory 182 
(#822). Thereafter, the MPU 181 thus reads from the A/D conversion input 
terminal an output of the vibration detection sensor 186 for detecting the 
vibration in the pitch direction (#823). 
Subsequently, the MPU 181 makes offset and gain adjustments (#824). For the 
offset adjustment, deviations in offsets of the vibration detection sensor 
186 and the position detection sensor 187 passed through the amplification 
circuits 190 and 191 are corrected when the vibration detection sensor 186 
for detecting the vibration and the position detection sensor 187 for 
detecting the position of the vibrator of the vibration detection sensor 
186 are unoperated (the vibrator of the vibration detection sensor 186 is 
stopped and outputs of the vibration detection sensor 186 and the position 
detection sensor 187 are set to zero). 
Also, for the gain adjustment, if signals of the vibration detection sensor 
186 and the position detection sensor 187 obtained from the amplification 
circuits 190 and 191 are compared as they are, even after the offset 
adjustment, the actually visible blur prevention effect is deviated from 
an observer's sense. To correct the deviation, the gain adjustment is 
performed. Specifically, even if the signals of the vibration detection 
sensor 186 and the position detection sensor 187 obtained from the 
amplification circuits 190 and 191 have equal values, the actual blur 
quantity on the finder is not necessarily equal to the position of the 
vibrator of the vibration detection sensor 186 at the moment. Therefore, 
through the gain adjustment, the output of the vibration detection sensor 
186 is converted to the blur quantity on the finder. Then, the blur 
prevention index is displayed on the position of the vibrator of the 
vibration detection sensor 186 which is equal to the blur quantity. 
The deviation quantity varies with a finder magnification which is linked 
with the focal distance of the photographing lens. Therefore, a parameter 
needs to be set for each focal length of the photographing lens and 
adjusted. As the focal length of the photographing lens is lengthened, the 
value becomes larger. Also, on a wide-angle side the blur quantity on the 
finder is small. Therefore, when the sensor output is small, in order to 
obtain a fine visibility on the finder, the blur prevention index had 
better not be moved. Therefore, a parameter on the wide-angle side is set 
smaller than that on a telephoto side. Specifically, originally the focal 
distance of the photographing lens is set in proportion to the gain 
parameter. In the embodiment, however, the parameter on the wide-angle 
side is set below a straight line indicative of the proportional 
relationship. 
In the actual processing of the MPU 181, the offset and gain are adjusted 
in a following equation: 
EQU Gp=AMPp(Gp'-OFFSETp) 
In the equation, Gp is an output of the vibration detection sensor 186 
after the adjustment, and Gp' is an output of the vibration detection 
sensor 186 before the adjustment. Constants for the offset and gain 
adjustments are represented by OFFSETp and AMPp, which are both prestored 
in the EEPROM 183. A value of OFFSETp is obtained as a difference in 
output between the vibration detection sensor 186 and the position 
detection sensor 187 when they are unoperated, and stored in the EEPROM 
183. The constant AMPp is used when the output of the vibration detection 
sensor 186 is converted to the blur quantity on the finder, so that the 
blur prevention index is displayed on the vibrator position of the 
vibration detection sensor 186 which is equal to the quantity. The 
constant is obtained in the following equation by using a focal length f 
stored in the memory 132. 
EQU AMPp=AMPpo.times.f/fo 
Here, AMPpo is a constant for the gain adjustment while a central focal 
length in a zoom range of the photographing lens is fo. The constant is 
experimentally obtained and stored in the EEPROM 133. Also, a parameter 
for the gain adjustment on the wide-angle side is set small. For this 
purpose, when the focal length f is shorter than a predetermined value fw, 
the parameter of the gain adjustment is obtained in the following equation 
. 
EQU AMPp=AMPpo/fo.times.(a.times.f+(1-a).times.fw) 
If a value of Gp is larger than the vibration width of the vibrator of the 
vibration detection sensor 186, the value of Gp is substituted for values 
on its opposite ends. Specifically, the output value of the position 
detection sensor 187 for detecting the position of the vibrator is set in 
a range from PRpmin to PRpmax. When the value of Gp is less than PRpmin: 
EQU Gp=PRpmin 
Also, when the value of Gp exceeds PRpmax: 
EQU Gp=PRpmax 
The output Gp of the vibration detection sensor 186 after the offset and 
gain adjustments is obtained in this manner, and stored in the memory 182 
(#825). 
Subsequently, the output PRp of the position detection sensor 187 for 
detecting the position of the vibrator of the vibration detection sensor 
186 in the pitch direction is read from the A/D conversion input terminal 
(#826). Then, it is determined whether or not a tilt of an output signal 
from the position detection sensor 187 is negative (#827). This is 
performed by comparing the previous output from the position detection 
sensor 187 stored in the memory 182 with the presently read output value 
PRp. If the value stored in the memory 182 is an initialized value, it is 
determined that the tilt of the output from the position detection sensor 
187 is not negative. In this manner, when the tilt of the output from the 
position detection sensor 187 is not negative (NO at #827), the process 
returns to the #826 to again read the output from the position detection 
sensor 187 for detecting the vibrator position of the vibration detection 
sensor 186 in the pitch direction from the A/D conversion input terminal. 
Again in the step #827, it is again determined whether or not the tilt of 
the output from the position detection sensor 187 is negative. The process 
is repeated until the tilt of the output from the position detection 
sensor 187 becomes negative. 
Subsequently, when the tilt of the output from the position detection 
sensor 187 becomes negative (YES at #827), the output PRp from the 
position detection sensor 187 at the moment is compared with the output Gp 
of the vibration detection sensor 186 after the offset and gain adjustment 
stored in the memory 182 (#828). As a result, when the difference is equal 
to or less than a value of the parameter which is read from the EEPROM 183 
into the memory 182 in a series of initial process, the outputs are 
regarded as substantially equal. In other words, the vibrator of the pitch 
vibration detection sensor 186 is regarded to be in a vibrating condition 
in which the blur prevention index 153 can be displayed in positions of 
the case where the vibration in the pitch direction at the moment is 
displayed in the image plane (corresponding to positions of the outputs 
161 and 163 shown by black dots in FIG. 17). Then, the process advances to 
the next step #759. On the other hand, when both output values are not 
regarded as substantially equal (NO at #828), the process returns to the 
step #826 to again read from the A/D conversion input terminal the output 
of the position detection sensor 187 for detecting the vibrator position 
of the vibration detection sensor 186 in the pitch direction. The same 
operation is repeated. 
At the next step #829, the MPU 181 reads from the A/D conversion input 
terminal an output of the vibration detection sensor 188 for detecting the 
vibration in the yaw direction. Thereafter, in the same manner as the 
output of the vibration detection sensor 186 for detecting the vibration 
in the pitch direction, the offset and gain are adjusted (#830). In the 
actual processing of the MPU 181, the offset and gain are adjusted in a 
following equation: 
EQU Gy=AMPy(Gy'-OFFSETy) 
In the equation, Gy is an output of the vibration detection sensor 186 
after the adjustment, and Gy' is an output of the vibration detection 
sensor 186 before the adjustment. Constants for the offset and gain 
adjustments are represented by OFFSETy and AMPy, respectively, which are 
both prestored in the EEPROM 183. A value of OFFSETy is obtained as a 
difference in output between the vibration detection sensor 188 and the 
position detection sensor 189 when they are unoperated, and stored in the 
EEPROM 183. The constant AMPy is used when the output of the vibration 
detection sensor 188 is converted to the blur quantity on the finder, so 
that the index is displayed on the vibrator position of the vibration 
detection sensor 188 which is equal to the quantity. The constant is 
obtained in the following equation by using the focal length f stored in 
the memory 132. 
EQU AMPp=AMPpo.times.f/fo 
Here, AMPpo is a constant for the gain adjustment while a central focal 
length in a zoom range of the photographing lens is fo. The constant is 
experimentally obtained and stored in the EEPROM133. Also, a parameter for 
the gain adjustment on the wide-angle side is set small. For this purpose, 
when the focal length f is shorter than a predetermined value fw, the 
parameter of the gain adjustment is obtained in the following equation. 
EQU AMPp=AMPpo/fo.times.(a.times.f+(1-a).times.fw) 
If a value of Gy is larger than the vibration width of the vibrator of the 
vibration detection sensor 188, the value of Gy is substituted for values 
on its opposite ends. Specifically, the output value of the position 
detection sensor 189 for detecting the position of the vibrator is set in 
a range from PRymin to PRymax. When the value of Gy is less than PRymin: 
EQU Gy=PRymin 
Also, when the value of Gy exceeds PRymax: 
EQU Gy=PRymax 
The output Gy of the vibration detection sensor 188 after the offset and 
gain adjustment is obtained in this manner, and stored in the memory 182. 
Subsequently, the MPU 181 reads from the A/D conversion input terminal the 
output PRy of the position detection sensor 189 for detecting the position 
of the vibrator of the vibration detection sensor 188 in the yaw direction 
(#831). Then, the output from the position detection sensor 189 at the 
moment is compared with the output Gy of the vibration detection sensor 
188 after the offset and gain adjustment stored in the memory 182 (#832). 
As a result, when the difference is equal to or less than the value of the 
parameter which is read from the EEPROM 183 into the memory 182 in a 
series of initial process, the outputs are regarded as substantially 
equal. In other words, the vibrator of the yaw vibration detection sensor 
188 is regarded to be in a vibrating condition in which the blur 
prevention index 153 can be displayed in the positions of the case where 
the vibration in the yaw direction at the moment is displayed in the image 
plane. Then, the process advances to step #833 for displaying the blur 
prevention index 153. On the other hand, when both output values are not 
regarded as substantially equal, the process returns to the step #826 to 
again read from the A/D conversion input terminal the output of the 
position detection sensor 187 for detecting the vibrator position of the 
vibration detection sensor 186 in the pitch direction. 
At the step #833 for displaying the blur prevention index 153, the MPU 181 
outputs a display on signal to the driving circuit 185 (the timing 
corresponds to the light emitting timing 165 shown in FIG. 17). During the 
output of the display on signal, the driving circuit 185 turns on the LED 
184. While the LED 184 is turned on, the blur prevention index 153 is 
displayed on the finder as shown in FIGS. 18A and 18B. 
As aforementioned, the output of the position detection sensor 187 for 
detecting the position of the vibrator in the pitch direction 
substantially equals the output of the vibration detection sensor 186. 
Also, the tilt of the output signal from the position detection sensor 187 
is positive. Then, the output of the position detection sensor 189 for 
detecting the position of the vibrator in the yaw direction substantially 
equals the output of the vibration detection sensor 188. In this case, by 
displaying the blur prevention index 153, the index displayed on the 
finder constantly follows up an object which is observed through the 
finder. Therefore, the blur prevention effect can be confirmed. 
According to the first and sixth embodiments, when the display-on signal is 
generated for displaying the blur prevention index in the finder image 
plane, not only the outputs of the vibration detection sensors and the 
position detection outputs of the vibrators but also the focal length 
information of the photographing lens at the moment are used. Therefore, 
in accordance with a change in image angle which is caused by a change in 
focal length, the blur prevention index can be displayed on an accurate 
position (a position which is regarded as a position on which the actual 
vibration is displayed as the index in the finder image plane). 
Consequently, the blur prevention effect can be more precisely confirmed. 
Also, as described in the first embodiment, the relationship of the focal 
distance for each of plural divided zones and the deviation quantity of 
the display position of the blur prevention index with a change in the 
finder magnification is prestored in the EEPROM. At the time of displaying 
the blur prevention index, the value corresponding to the focal distance 
at the moment is read from the EEPROM183. The value is used for the gain 
adjustment when the display-on signal is generated. Therefore, the 
processing in the MPU 181 is simplified. 
Also, in the sixth embodiment, when the blur prevention index is displayed, 
the focal distance at the moment is read. Through arithmetic operation, 
the parameter for the gain adjustment is calculated. By using the 
parameter, the display-on signal is generated. Therefore, a storage region 
of the EEPROM can be reduced. 
The case where the invention is applied to the compact camera has been 
described, but the invention can be applied to a single lens reflex 
camera, a digital camera and a video camera. Further, the invention can be 
applied to a device which can change focal distances and is provided with 
a blur correction function. 
Also, the vibration gyroscope is used as the vibration sensor, but the 
vibration sensor is not limited to this as long as vibrations can be 
detected by vibrating vibrators. Further, a plate-like vibrating piece is 
used as the vibrator, but a columnar or another vibrator can be used. 
Also in the embodiments, by reading the focal length of the photographing 
lens, using the prestored value or generating the display-on signal 
through arithmetic operation, the display position of the blur prevention 
index is changed to an optimum position. The invention is not thus 
limited. By controlling the light-on timing of the light source in 
accordance with the focal length, the display position of the blur 
prevention index may be changed. Alternatively, a member for changing the 
optical path is provided on any position between the light source and the 
finder optical path. In this case, by adjusting the optical path changing 
member in accordance with the focal length, the display position of the 
blur prevention index can be changed. 
The individual components shown in schematic or block form in the Drawings 
are all well-known in the camera arts and their specific construction and 
operation are not critical to the operation or best mode for carrying out 
the invention. 
While the present invention has been described with respect to what is 
presently considered to be the preferred embodiments, it is to be 
understood that the invention is not limited to the disclosed embodiments. 
To the contrary, the invention is intended to cover various modifications 
and equivalent arrangements included within the spirit and scope of the 
appended claims. The scope of the following claims is to be accorded the 
broadest interpretation so as to encompass all such modifications and 
equivalent structures and functions.