Display device in a camera finder

A display device for a camera finder include a display for displaying data, a position sensor which outputs a signal that is dependent on an orientation of the camera finder, and a controller for controlling the display such that the data is displayed along one of several predetermined directions. The predetermined direction that is selected depends on the output signal of the position sensor.

BACKGROUND OF THE INVENTION 
The present invention relates to a display device located in camera finder. 
Recently, cameras have been manufactured with finders that can display 
information related to the operation of the camera. For instance, the 
shutter speed, aperture value, exposure compensation etc., can be 
displayed, to allow the photographer to quickly determine these parameters 
while looking through the finder. 
In these cameras, the photographing information is displayed having a 
predetermined orientation. For example, in a 35 mm compact camera, or a 
single lens reflex camera, the photographing information is displayed to 
have a proper orientation (i.e., a normal reading orientation) when the 
camera is oriented to take a landscape picture. However, when the camera 
is rotated so that a portrait picture is to be taken, the displayed data 
has the same orientation with respect to the finder, as it has when a 
landscape picture is to be taken; therefore, the displayed data is also 
rotated, and does not have the proper orientation. Thus, for the 
photographer, the displayed data is not easy to read when the camera is 
not arranged to take a landscape picture. 
SUMMARY OF THE INVENTION 
It is therefore an object of the present invention to provide an improved 
displaying device for a camera capable of displaying photographing 
information that is easy to read, even if the camera is not oriented in 
the landscape position. For the above object, according to an aspect of 
the present invention, there is provided a display device for a camera 
finder which includes: 
a display mechanism for displaying data, the display mechanism being 
capable of displaying the data along at least two predetermined directions 
of the display device; 
a position sensing mechanism for outputting a signal according to an 
orientation of the camera finder relative to a gravitational axis; and 
a control mechanism for controlling the display device to display the data 
along one of the at least two predetermined directions in accordance with 
the output signal. 
According to another aspect of the present invention, there is provided a 
display device which includes: 
a display panel provided with a plurality of segments, in which the 
plurality of segments are arranged so that data can be displayed along 
either one of at least two predetermined directions of the display device; 
and 
a control mechanism for controlling the display device to display the data 
along one of the at least two predetermined directions, in accordance with 
a predetermined signal orientation of the display.

DESCRIPTION OF THE EMBODIMENTS 
FIG. 1 is a front view of an electronically controlled single lens reflex 
camera 10 to which a display device embodying the present invention is 
employed. The camera 10 consists of a camera body 11 and an exchangeable 
lens 14. A grip 12 is formed on one side of the camera body 11 (at the 
left as shown in FIG. 1). A release button 13 is provided on the upper 
surface of the grip 12. When the release button 13 is depressed halfway, a 
photometry and distance measuring operation are initiated. When the 
release button 13 is fully depressed, a shutter of the camera is released. 
FIG. 2 shows an arrangement of a finder field 20 and a LCD (Liquid Crystal 
Display) panel 30 of the camera body 11. As shown in FIG. 2, the LCD panel 
30 is located on one side of the finder field 20 (on the right side as 
shown in FIG. 2). The LCD panel 30 displays various photographing 
parameters related to the photographing operation. The information is 
displayed using a combination of seven-segment displays, with the segments 
being turned ON or OFF to form the appropriate alphanumeric. In FIG. 2, a 
number "8000" representing a shutter speed of 1/8000 second, and a number 
"8.0" representing an aperture value are displayed. 
FIG. 2 shows the camera body 11 oriented in a landscape position. The 
segments of the LCD panel 30 are arranged such that the photographing 
information can be displayed having the proper orientation (i.e., normal 
reading orientation). 
FIG. 3 shows the camera body 11 rotated 90.degree. counterclockwise with 
respect to FIG. 2, in a first portrait position (i.e., the camera 10 is 
oriented such that the grip 12 is located above the lens 14). However, by 
selecting a proper combination of segments to turn ON, the information can 
be displayed having the proper orientation. 
Similarly FIG. 4 shows the camera body 11 rotated 90.degree. clockwise with 
respect to FIG. 2, in a second portrait position (i.e., the camera 10 is 
oriented such that the grip 12 is located below the lens 14). Likewise, by 
selecting a proper combination of segments to turn ON, the information can 
also be displayed having the proper orientation (i.e., normal reading 
orientation). 
FIG. 5 shows the LCD panel 30 with all the segments turned ON. With this 
arrangement of the segments, the information can be displayed having the 
proper orientation (i.e., normal reading orientation), regardless of 
whether the camera body 11 is oriented in the landscape, first portrait, 
or second portrait position. 
The camera body 11 is provided with a position sensor 40 (FIG. 6) for 
detecting the position of the camera body 11 with respect to the direction 
of gravity. 
FIG. 6 shows a schematic view of the sensor 40 viewed from the front side 
of the camera body 11, when the camera body 11 is oriented in the 
landscape position. The sensor 40 has a first switch 41 and a second 
switch 45. The first switch 41 and the second switch 45 respectively have 
guide grooves 42 and 46, which are inclined at +45.degree. and 
-45.degree., respectively, with respect to the vertical direction. 
Switching balls 51 and 52 are movably provided in the guide grooves 42 and 
46, respectively. When the ball 51 contacts an edge 42a of groove 42, 
switch 41 is turned OFF. When the ball 51 contacts another edge 42b, 
switch 41 is turned ON. Similarly, when the ball 52 contacts edges 46a of 
groove 46, switch 45 is turned OFF, and when the ball 52 contacts another 
edge 46b, switch 45 is turned ON. 
When the camera body 11 is oriented in the landscape position, switches 41 
and 45 are both turned OFF, as shown in FIG. 6. When the camera body 11 is 
oriented in the first portrait position, switch 41 is turned ON and switch 
45 is turned off. When the camera body 11 is oriented in the second 
portrait position, switch 41 is turned OFF and switch 45 is turned on. If 
the camera body 11 is oriented in the landscape position but is 
up-side-down, both the first and second switches 41 and 45 are turned ON. 
Thus, from the status of the switches 41 and 45, the position of the 
camera can be detected. 
FIG. 7 shows a control for displaying the photographing information in 
accordance with the orientation of the camera body 11. 
The camera 10 is operable in two modes. The first mode or display 
changeover mode, is a mode in which the alphanumeric photographing 
information displayed on the LCD panel 30 is displayed always (i.e., 
normal reading orientation) having the proper orientation, for each of the 
landscape position, first portrait position and second portrait position. 
The second mode, or normal mode, is a mode in which the alphanumeric 
photographing information is always displayed having the proper 
orientation for the landscape position of the camera body 11, regardless 
of the orientation of the camera body 11. 
At step S1, it is determined whether the display changeover mode has been 
selected. If the display changeover mode has been selected (S1: YES), 
control goes to S2, otherwise, control goes to S7, where the landscape 
mode display is set. 
As shown in FIG. 7, there are four possible combinations of settings for 
the two switches 41 and 45. If Switch 41 is ON (S2: YES) and Switch 45 is 
OFF (S5: NO), then control goes to S6, where the first portrait mode 
display is set. 
If Switch 41 is OFF (S2: NO) and Switch 45 is OFF (S5: NO), then control 
goes to S7, where the landscape mode display is set. 
If Switch 41 is OFF (S2: NO) and Switch 45 is ON (S3: YES), then control 
goes to S4, where the second portrait mode display is set. 
If Switch 41 is ON (S2: YES) and Switch 45 is ON (S3: YES), then control 
goes to S7, where the landscape mode display is set. This is because it is 
assumed that the camera 10 will not normally be oriented in an 
up-side-down landscape position, unless the photographer is also 
up-side-down. Therefore, the photographing information is displayed as if 
the camera 10 was in the normal landscape position. 
In the above-described embodiment, a single LCD panel 30 having a plurality 
of segments, is employed. As shown in FIGS. 2, 3 and 4, some of the 
segments are commonly used when data is displayed, regardless of the 
orientation of the camera finder. For example, the segments used to 
display the "0" adjacent to the "8" in the number "8000" in FIG. 2, are 
also used to display the "0" adjacent to the "8" in the number "8000" in 
FIG. 3. Therefore, by using common segments to display data for each 
orientation, the total number of segments used can be decreased, thereby 
simplifying the circuitry used in the display device. 
In the above-described embodiment, the parameters are displayed in various 
directions on the same LCD panel 30 according to the camera position. 
However, the invention is not limited to this arrangement. FIG. 8 shows a 
second embodiment according to the present invention. 
In the second embodiment shown in FIG. 8, there are three LCD panels 80, 82 
and 84, respectively, provided on three side of the finder field 20, 
(i.e., the right, lower and upper sides as shown in FIG. 8). The LCD 
panels 80, 82 and 84 can display the same information, however the panels 
80, 82 and 84 are arranged differently. 
When the camera body 11 is oriented in the landscape position, only the LCD 
panel 80 is actuated to display the photographing information. When the 
camera body 11 is oriented in the first portrait position, the LCD panel 
82 is actuated. When the camera body 11 is oriented in the second portrait 
position, the LCD panel 84 is actuated. Thus, for each orientation of the 
camera body 11, the LCD panel to the right of the finder field 20, is 
actuated to display the photographing information. 
In the above description, the same display is actuated when the camera body 
11 is oriented in the landscape, right-side-up, or left-side-up position, 
according to the first embodiment; and, three different displays can be 
selectively actuated depending on the orientation of the camera in the 
landscape, right-side-up or left-side-up position, according to the second 
embodiment. However, according to the present invention, it is also 
possible to provide an extra LCD panel that is actuated when the camera is 
oriented in the up-side-down landscape position. 
The invention is applied to a single lens reflex camera in the above 
description. However, the invention can be applied to any type of camera 
having a finder system. 
Further, the display device is not limited to an LCD panel having a 
plurality of segments. The present invention may be use any type of 
display device. 
In addition, the position sensor described above is only an example, and 
any type of sensor which detects position with respect to gravity can be 
employed. 
As described above, according to the arrangement of the segments of the LCD 
panel 30, information can be displayed in the camera finder having the 
proper orientation, regardless of the orientation of the finder. 
The present disclosure relates to subject matter contained in Japanese 
Patent Application No. HEI 5-164379 filed on Jul. 2, 1993, which is 
expressly incorporated herein by reference in its entirety.