Device for recording and reproduction having head moving means

A device for recording and reproduction having a recording and reproducing head, a disk driving mechanism, a head moving mechanism for moving the head relative to the medium, a manual actuator to start recording of a signal, an adjusting mechanism for the tracking adjustment of the head, and a control mechanism for enabling the operation of the manual actuator to be effective only when the adjusting mechanism is set at a predetermined condition.

BACKGROUND OF THE INVENTION 
1. Field of the Invention 
This invention relates to devices for recording and reproduction and more 
particularly, to devices for recording and reproduction having record 
bearing medium drive means and head moving means. 
2. Description of the Prior Art 
In the video recording and reproducing apparatus using a disc-shaped record 
bearing medium, for example, a magnetic disc, while the record bearing 
medium is rotating at a corresponding speed to the field or frame 
frequency of television, the recording and reproducing head is moved in 
such a way that the video signals are recorded in concentric tracks or in 
a helical track, and the thus-recorded magnetic disc is to be treated 
similarly when in reproduction. Recently, however, because the quality of 
the record bearing medium and the performance of the recording and 
reproducing head have been improved to increase the recording density, as 
the width of the recording track and the track pitch decrease, the 
tolerance of each part of the recording and reproducing apparatus and the 
change of the dimensions of the magnetic disc with temperature and 
humidity get more responsible for the position error of the recorded 
tracks when in reproduction, and therefore it becomes more difficult to 
expect reproduction of images of good quality. 
To cope with such a drawback, apparatus of this kind necessarily include 
tracking means for finely adjusting the position of the recording and 
reproducing head relative to the tracks of the record bearing medium when 
in reproduction. 
It should be pointed out that when such an apparatus is switched to the 
recording mode again, the operator needs to bring the recording and 
reproducing head back to the absolute reference recording position. If 
this step of operation is overlooked, a problem arises that a recording 
starts with the recording and reproducing head off-set from the absolute 
reference track. 
SUMMARY OF THE INVENTION 
With such situations in mind, the present invention has been made, and its 
general object is to provide a novel device for recording and reproduction 
which can eliminate the drawbacks of the prior art. 
Another object of the invention is to provide a device for recording and 
reproduction which can prevent recording from occurring under the 
condition that the recording and reproducing head is out of registry with 
the prescribed position for recording caused by the tracking adjustment 
when in reproduction, and therefore can assure good interchangeability of 
the record bearing medium between apparatus. 
Under these objects, according to one aspect of the present invention, a 
device for recording and reproduction comprises a recording and 
reproducing head, means for driving a record bearing medium, means for 
moving the head relative to the record bearing medium, actuating means for 
recording, manually operable means for finely moving the head to make 
tracking adjustment, and control means for enabling operation of the 
actuating means to be effective only when the manually operable means is 
set at a predetermined position. 
In one embodiment of the present invention as applied to the recording and 
reproducing apparatus, the device of the invention can take the built-in 
form. In the alternative, it may otherwise be constructed in the form of a 
stand alone unit. In this case, an auxiliary unit for recording and 
another auxiliary unit for reproduction must be provided. In application 
to the recording apparatus, it is also possible to use the built-in form. 
In this case, an auxiliary unit for reproduction should be provided. 
Conversely, when applied to the reproducing apparatus with the use of the 
built-in form, an auxiliary unit for recording should be provided. It is 
to be noted that the auxiliary unit for recording can be included with 
signal generating or source means, and the auxiliary unit for reproduction 
can be included with output means such as display means or printer means, 
etc., or interface means therefor. 
Other objects, aspects and features of the invention will become apparent 
from the following description of embodiments thereof with reference to 
the accompanying drawings, in which:

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
In FIG. 1A, a flexible disc-shaped record bearing medium in the form of a 
magnetic disc 1 is contained in a cassette 2 made of resin or the like and 
formed in a flat box-like shape, and has a center hub 3 made of plastic 
with a hole 3a to be fitted on a spindle 14a of an electric motor 14, as 
will be fully described by reference to FIG. 4. The magnetic disc 1 is 
rotated by the motor 14 through the center hub 3. In a case according to 
the NTSC system, because the field frequency is 60 Hz, to record TV 
signals for one field in one revolution of the magnetic disc 1, the rate 
of revolution of the magnetic disc 1 is chosen at 3,600 rpm, thereby one 
field is recorded or reproduced on or from one track. 
The lower surface of the cassette 2 is provided with an apertured portion 
2a shown in FIG. 1B through which a recording and reproducing head (see 
FIG. 4) enters either to contact, or to confront, the magnetic disc 1. In 
alignment with this magnetic head entrance window (apertured portion 2a), 
there is another apertured portion 2b provided through the wall of the 
upper panel of the cassette 2 to allow a stabilizing plate (not shown) to 
enter so that good contacting or confronting relationship of the magnetic 
head 15 with the magnetic disc 1 is maintained. A counter 40 is rotatably 
supported in a portion of the housing of the cassette 2, indicating the 
number of recorded tracks on the magnetic disc the number of additional 
recordable tracks. To advance the counter 40 stepwise, a drive shaft 37 
with a key 37a, shown in FIG. 4, is inserted into a hole 40b with a detent 
groove 40a. 
In FIG. 2, as an example of the auxiliary unit for recording, there is 
shown an electronic camera having a body 9, a grip 10, a picture-taking 
lens 11 and a finder 12. 
5 is a device therein for recording and reproduction according to the 
present invention in the form of a unit releasably attached to the 
electronic camera body 9. To insert or remove the cassette 2, a lid 6 is 
opened and closed by an operator's finger engaging a hole 6a. A recording 
actuator or button 7 is provided for initiating a recording operation in 
which video signals, representing an object image formed with light 
entering through the picture taking lens 11, are produced from the 
electronic camera and recorded on the magnetic disc 1. A tracking dial 8, 
as the manually operable means for tracking adjustment, is rotatable to 
place its index mark 8a in registry with either a "REC"-labelled position 
or a "LOCK"-labelled position. With this tracking dial 8 in registry with 
the "REC" position, when the recording button 7 is pushed down, the 
recording operation is initiated. It is for this time that the magnetic 
head 15 is positioned at the absolute reference recording position of the 
magnetic disc 1. If the tracking dial 8 is out of registry with the "REC" 
position, the depression of the recording button 7 has no effect and it is 
impossible to carry out recording. 
In FIG. 3, the auxiliary unit for reproduction has a body 13 to which the 
device 5 for recording and reproduction, as detached from the electronic 
camera body 9 of FIG. 2, is attached to reproduce the video signals from 
the magnetic disc 1 in the device 5. Reference numerals 6, 6a, 7, 8 and 8a 
denote the similar parts to those shown in FIG. 2. After the device 5 has 
been attached to the body of the auxiliary unit 13 and before a 
reproducing operation is initiated, the operator needs to adjust the 
position of the magnetic head 15 to the recording track of the magnetic 
disc 1. This so-called "tracking" process comprises the steps of turning 
the tracking dial 8 to place its index mark 8a in registry with the 
"LOCK"-labelled position of FIG. 2 and then making a slight excursion of 
the dial 8, while this position being taken as the center. 
Referring to FIG. 4, the internal mechanisms of the device 5 will next be 
described. 
An electric motor 14 has an output shaft 14c on which a spindle 14a is 
fixedly mounted through a ring shaped permanent magnet 14b. The magnet 14b 
has a function of checking and locating the center hub 3 of FIG. 1 on the 
reference surface of the spindle 14a when the central hole 3a of the hub 3 
is put on the shaft 14c, a soft magnetizable plate (not shown) buried in 
the bottom surface of the center hub 3 being attracted by the permanent 
magnet 14b. 
The means for moving the head 15 stepwise by a prescribed pitch includes a 
stepping motor 21 having an output shaft on which a pinion 22 is mounted, 
a click gear 23 meshing with the pinion 22, a gear 27 meshing with the 
gear 23, a worm gear 30 on a common shaft of the gear 27, a worm wheel 33 
meshing with the worm gear 30, a screw 19 on a common shaft of the wheel 
33, and a head carrier 16 having a pin 20 in engagement with the screw 19. 
As the driving torque of the stepping motor 21, as the drive source, is 
transmitted to the carrier 16, the head 15 moves a predetermined 
pitch-by-pitch in a direction parallel to the radius of the magnetic disc 
1. 
The click gear 23 is rotatably mounted on a shaft 24 fixedly mounted to a 
chassis (not shown) of the device 5 and is constructed with a click cam 
23a having a detent slot 23d cut in the peripheral surface thereof, and 
large and small gears 23b and 23c fixedly secured to each other and to the 
click cam 23a in concentric relation, the large gear 23b meshing with the 
pinion 22 and the small gear meshing with the gear 27. A click lever 26 is 
rotatable about a pivot pin 25 fixedly secured to the chassis. A coil 
spring 64 urges the lever 26 is a clockwise direction so that a lever nose 
26a abuts on the camming surface. When the lever nose 26a drops in the 
detent slot 23d, the click cam 23a is locked. When the stepping motor 21 
starts to rotate in a direction indicated by arrow C, the driving torque 
first releases the click cam 23a from the locking connection through the 
pinion 22 and large gear 23b as the slot 23d moves away from the nose 26a 
while lifting the latter to turn the lever 26 against the spring 64, 
thereby a normally open type switch 63 is closed in due to engagement with 
the tail of the lever 26. 
Then, when the click cam 23a has rotated just one revolution, rotation of 
the click gear 23 is stopped by the lever nose 26a engaging the slot 23d, 
and as, at this time, the switch 63 is opened, the energization of the 
stepping motor 21 is stopped. Thus, the head 15 on the carrier 16 is 
advanced through the length of one prescribed pitch in the direction 
parallel to the radius of the magnetic disc 1. In such a manner, the 
position of each track to be recorded is indexed accurately. 
A shaft 29 on which are fixedly mounted the gear 27, the worm gear 30 and 
an engaging member 32, having a circumferential groove 32 into which a pin 
48 extends from a bell crank 46 cooperative with the tracking dial 8, is 
urged by a compressed coil spring 31 in a direction indicated by arrow A 
to absorb any backlash between the worm gear 32 and the worm wheel 33. 
Another shaft 19S, on which are fixedly mounted the worm wheel 33, a 
capstan 44, to which is connected one end of a wire 45 after a prescribed 
number of turns thereon, the opposite end of which is connected to a reel 
38 for the counter 40 of FIG. 1 after a prescribed number of turns 
thereon, and the screw 19, is rotatably supported at both ends on bearings 
34. 
An adjusting screw 36 is arranged with its tip face 36 to engage the face 
of one end of the shaft 19S through a steel ball 35 so that when in the 
assembly line for the device 5, the axial position of the shaft 19S can be 
finely adjusted by turning the screw 36 to bring the magnetic head 15 into 
coincidence with the absolute reference recording position through the 
screw 19, engaging pin 20 and carrier 16. 
The head carrier 16 is slidably mounted on a guide shaft 17 and has support 
members 15a and 15b for the magnetic head 15, and two cutouts 16a and 16b 
through which the shaft 19S and another guide shaft 18 pass, respectively. 
A roller 60 is rotatably mounted on a bent-off portion of a substantially 
"U"-shaped member 61 fixedly mounted to the free end of a leaf spring 62 
of which the opposite end is fixedly mounted on the chassis. Because the 
roller 60 pushes the free end of the carrier 16, the cutout 16b rests on 
the second guide shaft 18. An adjusting screw 18a has its tip abutting on 
the guide shaft 18 within the cutout 16b. Therefore, when the screw 18a is 
turned, the angular position of the carrier 16 about the first guide shaft 
17 can be finely adjusted. This leads to adjustment of the inclination of 
the magnetic head 15 to the magnetic disc 1. Also in a direction indicated 
by arrow B, this carrier 16 is urged by a spring (not shown) to press the 
face of the end of the screw shaft 19S against the face of the end of the 
adjusting screw 36 through the steel ball 35. Therefore, the carrier 16 is 
biased to the direction B under the condition that the backlash between 
the pin 20 and the screw 19 is absorbed. 
Next, counter drive means is described. A counter shaft 37 inserts into the 
counter hole 40a of the counter 40 provided in the cassette 2 and has a 
key portion 37a to engage in the key groove 40b of the counter 40. A 
counter reel 38, rotatable as a unit with the counter shaft 37, is 
provided with a gear 38a meshing with a sector gear 41, and is rotatably 
supported on a shaft 39 fixedly mounted to the chassis along with the 
counter shaft 37. The sector gear 41 meshing with the gear 38a is 
rotatably supported on a shaft 42 fixedly mounted to the chassis, and is 
connected to one end of a tension coil spring 43, of which the other end 
is connected to the chassis to urge the sector gear 41 in a 
counterclockwise direction. Therefore, the counter reel 38 is urged in a 
clockwise direction. For this reason, through the wire 45 whose ends are 
convoluted a number of times on the counter reel 38 and the capstan 44, 
the capstan 44 is urged in a clockwise direction. And when the capstan 44 
is turned in the counterclockwise direction by the stepping motor 21, the 
capstan 44 winds in the wire 45 to advance the counter reel 38 in the 
counterclockwise direction, and the counter 40, which is driven to rotate 
by the counter drive shaft 37, is advanced in the counterclockwise 
direction, indicating the number of tracks recorded, or the number of the 
track to be next recorded. Next described is the manually operable means 
for tracking adjustment. When in reproduction, tracking is carried out 
with the operation of the actuating means for recording being 
simultaneously rendered ineffective, and when in recording, the magnetic 
head is positioned in the absolute reference recording position, while the 
operation of the actuating means for recording is simultaneously rendered 
effective. 
This manually operable means for tracking adjustment includes a gear 53, 
another gear 52, a release lock plate 51 having a click notch 51b and a 
slit 51a, an eccentric cam 49 and a bell crank 46 having a pin 48 in 
engagement with an engaging groove 32a of the engaging member 32. 
The tracking dial 8 is connected to the gear 53 through a shaft 55. This 
gear 53 meshes with the gear 52 fixedly mounted to one end of a shaft 50 
on which is fixedly mounted the release lock plate 51. Fixedly mounted to 
the other end of the shaft 50 is the eccentric cam 49 provided with a 
stopper 49a fixedly mounted on the peripheral surface thereof and arranged 
to hinder the release lock plate 51 from rotating more than one 
revolution. 
7 is the recording actuator means for causing the magnetic head 15 to 
perform recording, or the recording button, with a return spring 56 around 
a pin 54 thereof. 
A click lever 58 is arranged to engage in the notch 51b of the release lock 
plate 51 and is rotatably mounted on a pin 59 fixedly mounted to the 
chassis. A spring (not shown) urges the lever 58 in a clockwise direction. 
A normally open recording trigger switch 57 is arranged to align with the 
pin 54 of the recording button 7 through the slit 51a when the mark 8a on 
the tracking dial 8 is in registry with the "REC"-labelled position of 
FIG. 3 where the release lock plate 51 is latched by the click lever 58 
with its nose in engagement with the click notch 51b. It should be noted 
that at this time, the magnetic head 15 is positioned in the absolute 
reference recording position of the magnetic disc 1. Then, when the 
recording button 7 is pushed inwards, its pin 54 moves past the slit 51a 
to close the switch 57, thereby a recording trigger signal is produced, 
initiating a recording operation. 
The bell crank 46 is rotatable about a pivot pin 47 fixedly mounted to the 
chassis, and has an arm 46a in abutting engagement on the periphery of the 
eccentric cam 49 and another arm on which is fixedly mounted a pin 48 
engaging in the groove 32a of the engaging member 32. As has been 
described above, the engaging member 32 is urged in the direction of arrow 
A by the compressed spring 31. Therefore, this bias force is received by 
the pin 48 also, urging the bell crank 46 in the counterclockwise 
direction. 
As has been described above, only when the mark 8a on the tracking dial 8 
is in registry with the "REC"-labelled position does the recording button 
become possible to operate as shown in FIG. 4. When the mark 8a is moved 
to any position other than the "REC"-labelled position, tracking becomes 
possible to perform. In this state, when the tracking dial 8 is turned, 
the eccentric cam 49 is turned, thereby the arm 46a of the bell crank 46 
is moved up and down. Thereby, the bell crank 46 is turned about the pivot 
pin 47 in the clockwise or counterclockwise direction. This movement is 
transmitted through the pin 48 engaging in the groove 32a to axially move 
the engaging member 32 along with the shaft 49 and the worm gear 30. Axial 
movement of the worm gear 30 is transmitted to rotative movement of the 
worm wheel 33 and therefrom by the screw 19-and-pin 20 connection to 
minute linear movement of the head carrier 16 in the direction parallel to 
the radius of the magnetic disc 1. Thus, the magnetic head 15 is adjusted 
in position relative to the recording tracks on the magnetic disc 1. 
The operation of the device 5 of such construction is described in 
connection with each of the cases when in use with the electronic camera 
body 9 to record video signals of an object image, and when in use with 
the auxiliary unit body 13 to reproduce the video signals. 
When recording video signals of an object, the device 5 for recording and 
reproduction is attached to the body of the electronic camera 9 shown in 
FIG. 2, and the tracking dial 8 is then turned to place its mark 8a in 
registry with the "REC"-labelled position. It is in this state that as 
shown in FIG. 4, the release lock disc 51 is set in a click-stopped 
position by the nose of the lever 58 engaging in the notch 51b and clears 
the path of movement of the pin 54 to the switch 57 as the slit 51a comes 
in the path. At the same time, the eccentric cam 49 takes a certain 
angular position and is held stationary therein. This determines the 
position of the bell crank 46. Therefore, the engaging member 32 is held 
in a prescribed axial position. Then, as the stepping motor 21 rotates, 
the click cam 23a is latched in every one revolution by the lever nose 26a 
engaging in the detent slot 23d of the cam 23a, moving the magnetic head 
15 accurately one track pitch-by-pitch. Such an indexing operation of the 
position of the recording track is recycled until the counter 40 reaches 
its null position. Motion of the gear 27 is transmitted through the worm 
gear 30-and-wheel 33 to rotate the capstan 44. The rotating capstan 44 
winds in the wire 45, while the counter reel 38 winds it off. For every 
one revolution of the click cam 23a, therefore, the drive shaft 37 rotates 
the counter 40 one pitch. Also through the screw 19-and-pin 20 connection, 
the carrier 16 is moved one pitch in the direction parallel to the radius 
of the magnetic disc 1 toward the absolute reference recording position. 
With the magnetic head 15 in the absolute reference recording position, 
when the recording button 7 is then pushed down, its pin 54 moves past the 
slit 51a of the release lock disc 51 to close the switch 57, thereby a 
signal processing circuit (not shown) is rendered operative, initiating a 
recording operation. 
After termination of the recording operation, the device 5 is detached from 
the body 9 of the electronic camera, and then attached to the body 13 of 
the auxiliary unit for reproduction as shown in FIG. 3. It should be noted 
here that as has been mentioned above, when assembling, with the release 
lock disc 51 assuming the "REC"-position where the slit 51a is just 
opposite to the pin 54 of the recording button 7, the adjusting screw 36 
is finely operated so as to bring the magnetic head 15 into alignment with 
the absolute reference recording position of the magnetic disc 1. After 
the completion of such position adjustment of the magnetic head 15, as 
high a tracking accuracy as corresponding to the gear tolerance of the 
gear train from the large gear 23b through the small gear 23c, gear 27, 
worm gear 30 and worm wheel 33 to the screw 19 is assured. Under the 
normal condition, therefore, it is always with this accuracy that the 
setting of the magnetic head 15 to the absolute reference recording track 
is resulted. And, recording of the absolute reference track is possible to 
perform. 
However, because the tolerances of the constituent parts of the moving 
mechanism for the head carrier 16 differ from item to item, and because 
the magnetic disc 1 expands or shrinks as the temperature and humidity 
change, when the video signals were recorded, the absolute reference 
recording track has an appreciable position error in itself. 
So, the operator needs to carry out a tracking adjustment by turning the 
dial 8 to a position with the mark 8a out of registry with the 
"REC"-labelled position. That is, as the tracking dial 8 moves finely, the 
gear 53 finely turns the release lock disc 51 and the up-and-down cam 49 
through the interconnecting gear 52, thereby the bell crank 46 is finely 
turned about the pivot pin 47. Such movement of the bell crank 46 is 
transmitted by the pin 48-and-number 32 connection to fine linear movement 
of the worm gear 30 in the direction A or the reversed one thereto. This 
causes fine rotative movement of the worm wheel 33 which is then 
transmitted through the screw 19-and-pin 20 connection to move the head 
carrier 16 in the direction parallel to the radius of the magnetic disc 1. 
Thus, a fine tracking adjustment of the magnetic head 15 is formed. 
The making of such a tracking operation provides assurance of reproducing 
an image of good quality. When switched to the recording mode, however, 
the magnetic head 15 must be returned from the tracking-adjusted position 
for reproduction to the original absolute reference recording position by 
resetting the tracking dial 8 to the "REC"-position. Or otherwise, no 
recording operation could be initiated by pushing down the recording 
button 7, because in any other position than the "REC"-position, the pin 
54 is hindered from closing the switch 57 by the release lock disc 51. 
Referring next to FIG. 5, there are shown electrical circuit systems in the 
body 9 of the electronic camera, the body 13 of the auxiliary unit for 
reproduction and the device 5 for recording and reproduction. 
In FIG. 5A, the circuit system in the electronic camera body 9 is generally 
indicated at 100, including an image pickup element 101, such as CCD, for 
producing electrical signals representing an object image, a drive circuit 
102 for the image pickup element 101, a synchronization signal forming 
circuit 103, a processing circuit 104 receptive of the output of the image 
pickup element 101 for producing video signals, an electronic viewfinder 
(EVF) 105, such as a CRT, receptive of the output of the processing 
circuit 104 for electronically displaying an object image, a power source 
circuit 106 and a power switch 107. The video signals from the processing 
circuit 104 are applied not only to the EVF 105 but also to an output 
terminal 104a. The electrical power from the power source circuit 106 is 
supplied to the internal circuit of the electronic camera body 9 and to an 
output terminal 106a. These two output terminals 104a and 106a are 
arranged to connect with input terminals of recording and power supply 
circuits of the circuit system in the device 5, respectively, when the 
device 5 is attached to the camera body 9. 
In FIG. 5B, the electrical circuit system in the unit body 13 is generally 
indicated at 200, including a reproduced signal processing circuit 201 
having an input terminal 201a to which a reproduced signal is supplied, a 
monitor 202, such as CRT, receptive of the output of the processing 
circuit 201 for viewing a reproduced image, and another processing circuit 
203 receptive of the output of the first processing circuit 201 for 
producing signals usable in a printer, for example, at an output terminal 
203a thereof. The input of the printer is connectable to this terminal 
203a. A power source circuit 204 supplies electrical power to the internal 
circuit and an electrical power output terminal 204a. The input terminal 
201a and output terminal 204a are arranged to connect with output and 
input terminals of a reproducing circuit and a power supply circuit of the 
device 5, respectively, when the device 5 is attached to the unit body 13. 
In FIG. 5C, the circuit system of the device 5 is generally indicated at 
300. An input terminal 301a is arranged to connect with the output 
terminal 104a for the video signal of the circuit system 100, an output 
terminal 305a for the reproduced signals to connect with the input 
terminal 201a of the circuit system 200, and another input terminal 308a 
for electrical power to connect with the output terminal 106a or 204a. 
The circuit system 300 includes a recording circuit 301, a mode selector 
switch 302 having a movable pole with a throw 302a for the recording mode 
and another throw 302b for the reproduction mode, a recording control 
circuit 303 responsive to closure of the recording trigger switch 57 for 
causing the recording circuit 301 to record video signals for one field 
through the magnetic head 15 and responsive to termination of the 
recording operation of the one-field signals for producing a single pulse 
for moving the magnetic head 15 to the next recording track, and a drive 
circuit 304 for the stepping motor 21 responsive to the single pulse for 
energizing the stepping motor 21. Soon after the motor 21 starts to 
rotate, as the click gear 23 has rotated to a very small angle, the click 
recess 23d moves away from the lever nose 26a. It is at this time that the 
aforesaid pulse becomes low. And, when the nose 26a rides on the outer 
peripheral surface of the cam 23a, the tail of its lever 26 closes the 
switch 63. After that, the drive circuit 304 continues energizing the 
motor 21 until the click gear 23 rotates one revolution to allow the lever 
26 to latch the cam 23a under the action of the spring 64 and to open the 
switch 63. In such a manner, the movement of the magnetic head 15 by one 
track pitch is accurately controlled. 
305 is a reproducing circuit and 308 is a power supply circuit. When the 
circuit system 300 is connected to the circuit system 100 or 200, the 
power supply circuit 308 is supplied with electrical power from the power 
source circuit 106 or 204 of the system 100 or 200, respectively, thereby 
the internal circuit of the system 300 is supplied with electrical power. 
306 is a reproduced track selecting circuit through which the stepping 
motor drive circuit 304 is actuated to change the track to be reproduced. 
A motor control circuit 307 adjusts the speed of rotation of the motor 14 
to a prescribed value (3,600 rpm) when in either of the recording and 
reproducing modes. 
The operation of the electrical circuit systems of such construction is as 
follows: 
When recording, the device 5 is attached to the camera body 9, thereby the 
video signal output terminal 104a and the electrical power output terminal 
106a are connected with the input terminals 301a and 308a, respectively. 
With the switch 302 set in the illustrated position 302a, when the power 
switch 107 is closed, the electrical power from the power source circuit 
106 is given to the internal circuit of the system 100 and also through 
the power supply circuit 308 to the internal circuit of the system 300. An 
object image on the image pickup element 101 is scanned to produce signals 
which is then applied to the processing circuit 104. The video signals 
from the circuit 104 are applied to the electronic viewfinder 105 and also 
through the recording circuit 301 and switch 302 to the magnetic head 15, 
and are recorded on the magnetic disc 1 while being rotated at the 
prescribed speed by the motor 14 under the control of the motor control 
circuit 307. 
In this case, the recording circuit 301 is controlled by the recording 
control circuit 303 responsive to closure of the recording trigger switch 
57, shown in FIG. 4, in such a manner that video signals for one field are 
recorded through the magnetic head 15. Further this recording control 
circuit 303, responsive to termination of the recording of the one-field 
signals, produces the signal pulse for moving the magnetic head 15 to the 
next recording position. This pulse is applied to the stepping motor drive 
circuit 304. Responsive to that pulse, the circuit 304 rotates the 
stepping motor 21. Here, the duration of the pulse from the recording 
control circuit 303 is such that the click gear 23 is turned a very small 
angle by the rotation of the stepping motor 21 and the click lever is 
disengaged from the click recess 23d of the click cam 23a when the pulse 
becomes low. 
Meanwhile, the click lever 26 is turned about the pivot pin 25 in the 
counterclockwise direction, thereby the switch 63 is turned on by the 
lever tail 26b. Thereby, the stepping motor drive circuit 304 continues 
rotating the stepping motor 21 until the click gear 23 rotates one 
revolution, the click lever 26 again latches the click cam 23a at the 
click recess 23d under the action of the spring 64, and the switch 63 is 
opened. In such a manner, the movement of the magnetic head 15 by one 
track pitch is controlled accurately. 
When in reproduction, the device 5 is attached to the body 13 of the 
auxiliary unit for reproduction, thereby the input and output terminals 
201a and 204a are connected with the output and input terminals 305a and 
308a, respectively. The electrical power of the power source circuit 204 
is applied to the internal circuit of the system 200 and also through the 
power supply circuit 308 to the internal circuit of the system 300. Also, 
the switch 302 is changed over to the position 302b and the magnetic head 
15 is connected to the reproducing circuit 305. The reproduced output 
signals produced from the magnetic head 15 through the reproducing circuit 
305 are applied to the reproduced signal processing circuit 201 of the 
circuit system 200, and the reproduced image can be viewed by the monitor 
202. 
When in reproduction, the track to be reproduced can be changed by 
actuating the stepping motor drive circuit 304 through the reproduced 
track selecting circuit 306. 
It should be noted that though the foregoing embodiment has been described 
in connection with the device for recording and reproduction in the form 
of a unit releasably attachable to an auxiliary unit for recording, for 
example, the electronic camera, and also to an auxiliary unit for 
reproduction including the CRT display, it is also possible, as has been 
described above, to construct the device of the invention in the form of 
an intimate, inseparable part of the aforesaid recording apparatus body 
and/or the reproducing apparatus body. 
Also though the foregoing embodiment of the invention has been described in 
connection with the magnetic type of the disc-shaped record bearing 
medium, the present invention is not confined to the magnetic type. It is 
to be understood that the present invention is applicable to the optical 
type and the electrostatic capacity type. Further the disc-shaped record 
bearing medium is applicable to other signals than the video signals, for 
example, data signals in floppy disc recording and/or reproducing 
apparatus. 
As has been described in greater detail above, according to the present 
invention, recording with the recording and reproducing head off-set from 
the prescribed position for recording by the tracking when in reproduction 
can be avoided. Therefore, it is made possible to provide a device for 
recording and reproduction which can assure good interchangeability of the 
record bearing medium between apparatus. 
Also, though, in the illustrated embodiment, the blocking of the recording 
button in response to setting of the dial 8 to any other position than the 
"REC"-position is effected mechanically by the release lock disc 51, an 
example of variation may be made such that instead of such a mechanical 
lock, a switch is arranged between the trigger switch 57 and the recording 
control circuit 303 to make when the dial 8 is in the "REC"-position and 
to break when out of that position. Of course, in this case, the recording 
button is operable at any time, but its operation is made effective by 
this newly provided switch only when the dial 8 is in the "REC"-position.