JPH07170476A - Electronic still camera - Google Patents

Abstract

(57) [Summary] (Correction) [Object] The present invention provides a camera for recording a still image signal on a disk-shaped magnetic recording medium whose rotation is controlled at a constant angular velocity.
High-quality still image signal recording is realized, and rotation control accuracy detection means for the disk-shaped magnetic recording medium is provided so that recording can be performed with high rotation control accuracy. [Structure] A lens mount 3 formed to be engageable with a rear end of an interchangeable lens 1, an automatic diaphragm interlocking lever 4 in a lens mount opening, an aperture lever 2 for performing an automatic diaphragm function with the lever, and a finder light. A quick return mirror 5 for taking out, a release button 6, a mode switching ring 7 for switching between one-frame shooting and continuous-frame shooting, locking the release button and switching to a position where long-time shooting is not performed, and an indicator showing the number of shooting frames 8. The changeover switch 9 including the recording / non-recording changeover switch 9 of the magnetic disk is set to the non-recording position, and the release button is operated to move the position of the recording head to an arbitrary number of frames. .

Description

Detailed Description of the Invention

The present invention relates to an electronic still camera for recording a still image on a magnetic recording medium such as a disc-shaped magnetic sheet or a magnetic disc which is a disc-shaped magnetic recording medium. In a camera that records a still image signal on a disk-shaped magnetic recording medium that is controlled to a constant rotation by the motor as described above,
An important condition for recording a high-quality still image is to reduce the adverse effect of dark current on the video signal obtained from the image pickup means, and to use a magnetic disk or magnetic sheet that is highly accurately rotated at a constant angle. It is important to keep a record. That is, important conditions for recording a high-quality still image are input image signals with less noise and high-precision rotation control of the magnetic disk or magnetic sheet.

It is an object of the present invention to realize high-quality still image signal recording in a camera which records a still image signal on a disk-shaped magnetic recording medium whose rotation is controlled at a constant angular velocity. For the above-mentioned purpose, the present invention is provided with a rotation control accuracy detecting means for the disk-shaped magnetic recording medium so that recording can be performed in a state where the rotation control accuracy is high. Embodiments of the present invention will be described below with reference to the accompanying drawings. 1a and 1b are a front perspective view and a top view showing the external appearance of an electronic camera (hereinafter abbreviated as a camera) according to the present invention. In the figure, Ca indicates the camera body. Reference numeral 1 denotes an ordinary interchangeable lens, which is provided with an adjusting unit such as a distance adjusting ring and an aperture adjusting ring, which are necessary for ordinary photography. 3 is a lens mount and an interchangeable lens 1
It is formed so that it can be engaged with the rear end. The automatic diaphragm interlocking lever 4 provided in the lens mount opening is engaged with the diaphragm lever 2 provided on the interchangeable lens side to constitute a known automatic diaphragm function. Reference numeral 5 is a quick return mirror (hereinafter referred to as a mirror) for extracting light from the finder. The release button 6 on the top of the camera and the axis 7 arranged coaxially are a mode switching ring for taking one frame (S mode).
And continuous frame shooting (C mode) are switched, and the release button is locked and switched to a position (OFF) for the case where shooting is not performed for a long time (described later). Reference numeral 8 is a display for indicating the number of frames to be photographed, which is constituted by a digital display of liquid crystal, for example, and shows the track position of the head for recording on the magnetic disk. 9 indicates the case where recording is normally performed on the magnetic disk when the camera is operating,
This is a recording / non-recording changeover switch for the case of moving the head to the next photographing frame without recording. That is,
Set this selector switch 9 to the non-recording position (NR),
By operating the release button, only the recording operation on the disc in the normal photographing operation is performed and the operation is performed, so that the position of the recording head can be moved to an arbitrary number of frames. Reference numeral 10 is a shutter speed setting dial, 11 is a shoe of a strobe device, and a contact 11a for transmitting and receiving a signal is provided. 12 is an eyepiece eyepiece.

2 and 3 are sectional views of a camera according to the present invention, showing a horizontal cross section and a vertical vertical section, respectively.
1 is a sectional view taken along the line I-I of FIG. 1a, and FIG. 3 is a sectional view taken along the line II-II of FIG. 1b. In FIG. 2, magnetic recording disk cassette 20
(Hereinafter, simply referred to as a cassette) is inserted or removed, and in FIG. 3, the cassette 20 is inserted,
The state of being attached to the camera body Ca is shown. Figure 2, b
Reference numeral 23 denotes a cassette holder into which the cassette 20 is inserted, which is rotatably connected by a link member 22 and a pin 22a. The link member 22 is rotatably attached to the camera body by a shaft 22b. Therefore the cassette holder 23
By engaging with the pin 21c provided on the back cover 21, the camera main body is taken in and out of the cassette housing portion 24 in synchronization with the opening / closing operation of the back cover 21. Also cassette holder
A positioning spring 23 a for the cassette 20 is arranged inside the 23. When the cassette is inserted from the state shown in FIG. 2, the cassette is inserted into the cassette holder 23 and the back cover 21
When closed, the link member 22 moves the cassette 20 and the cassette holder 23 in a direction parallel to the rotation axis of the disk drive shaft 25, and the center hole of the rotary hub 20b at the center of the magnetic recording disk 20a in the cassette is moved to the disk drive shaft 25. Central axis of 25a
To fit. At this time, the drive pin 26b provided on the disk drive shaft 25 is in a state of being pushed axially by the rotary hub against a spring (not shown). After that, the rotation of the disk rotation motor M1 is driven via the belt 26 to drive the shaft.
When the pin 25b transmitted to the rotor 25 moves to the position of the small hole of the rotary hub 20b, the pin is fitted into the small hole by the force of the above-mentioned spring (not shown) and the rotational force of the motor M1 is transferred to the disk 20a.
Will be communicated to. When the cassette is inserted, the holder pressing spring 21a provided on the back cover 21 positions the cassette holder 23, and similarly, the hub pressing 21b.
Engages with the rotary hub 20b of the disk and lightly presses the rotary hub against the drive shaft 25, respectively, and the mounted state of FIG. 3 is obtained. Reference numeral 27 is a cover plate that prevents dust and the like from entering the cassette housing portion 24, and is rotatably attached to the camera body. When the cassette holder 23 is moved, it is rotated to the retracted position when the cassette is inserted. When the cassette is inserted as described above, the magnetic head 30
23, the magnetic disk 20a is brought into contact with each other through the head insertion holes formed in the disk cassette 20, and magnetic recording becomes possible. On the other hand, when the cassette is to be taken out, the well-known back cover locking mechanism (not shown) is released and the back cover is opened to bring the cassette holder into the state shown in FIG. 2 so that the cassette can be taken out. In FIG. 2, reference numeral 28 denotes a back lid opening / closing detection pin, which detects by opening / closing the electrical contact S1 in conjunction with opening / closing of the back lid. For example, when the back lid is open, the camera does not operate even if the release button is pressed. It is for performing operations such as doing. 29 is a battery storage lid for storing the power supply battery 34. Reference numeral 31 denotes a circuit board including a solid-state image sensor, which is attached to the supporting board 19 of the camera body in a state where the position can be adjusted by adjusting screws 32. The image element provided on the circuit board 31 is provided with a color separation filter (not shown) and an infrared light cut filter for compensating the spectral sensitivity of the element on the front surface thereof. Reference numeral 35 is a well-known mechanically driven electronically controlled focal plane shutter, and an optical low-pass filter 18 is disposed on the front surface thereof. The optical low-pass filter 18 is provided on the front surface of the shutter in order to prevent a decrease in shutter efficiency due to the filter thickness. 33a and 33b are electronic circuit printed circuit boards for image signal processing. Figure
D1 and D on the left and right of the mirror box shown in 2
Reference numerals 2 are blocks of the operation of the quick return mirror 5 and the drive mechanism section D1 of the automatic diaphragm lever 4 and the drive mechanism section D2 of the shutter serge mechanism and magnetic head moving mechanism (details will be described later).

At the time of observing the finder image before and after the photographing operation, the light beam reflected by the quick return mirror 5 (which can be a semi-transparent mirror and a half prism) as shown in FIG. 3 is well known as shown in FIG. As described above, an image is formed on the screen 17, and is guided to the eyepiece lens 13 through the condenser lens 16 and the pentaprism 15. Between the pentaprism and the eyepiece, the viewfinder optical path glass to prevent the viewfinder eyepoint from becoming short.
Block 14 is arranged. Reference numeral 100 denotes a known light receiving element for measuring the brightness of a subject, which is composed of, for example, a silicon photodiode. A motor M2 arranged at the bottom of the mirror box is a motor serving as a power source for the drive mechanism unit D1 that drives the mirror and the automatic diaphragm and the drive mechanism unit D2 that drives the shutter charge and the magnetic head movement. D3 is a magnetic disk rotation mechanism section. FIG. 4 is a perspective view of a main mechanical portion of the camera according to the present invention, which includes a driving mechanism for a mirror mechanism, an automatic diaphragm mechanism, a shutter charge mechanism, and a magnetic head moving mechanism.

FIG. 4 shows a state after the photographing operation is completed and before a new photographing operation is started. The mirror holding plate 36 for holding the mirror 5 is rotatably supported by rotary shafts 37a, 37b attached to the left and right, and a weak spring 38 for removing play and maintaining the posture is hung on the shaft 37b side. . Reference numeral 39 is a mirror drive lever, which engages with a pin 36a implanted in the mirror holding plate 36. The mirror drive lever 39 is the automatic diaphragm lever 4 described above.
And a shaft 40 are coaxially and rotatably supported, and a diaphragm lever spring 41 is hung between the two via a pin 4a and a pin 39a. Both of them rotate as a center of rotation.
Further, a signal pin 39b for activating the mirror switch S2 for detecting the mirror start is implanted at one end of the lever 39, and a roller 42 interlocking with a mirror drive cam 45 is rotatably provided at the other end. There is. Mirror drive lever
The spring 43 hung on the pin 39c on 39 is a mirror drive spring, and 44a and 44b are sliding brush contacts which constitute the phase detection switch 4. A rotation limiting claw 47 is fixed to a gear 46 integrated with the mirror drive cam 45, and is set by a rotation stopper 48 so that both the clockwise and counterclockwise rotations have a rotation angle of less than one rotation. The raising and lowering of the mirror is limited by the rotation direction of the motor M2, and when the motor M2 rotates counterclockwise (arrow A) from the state shown in FIG. The gear 46 and the mirror drive cam 45 also rotate counterclockwise (arrow B). Accordingly, the roller 42 follows the mirror driving cam 45 by the biasing force of the mirror driving spring 43, and the mirror driving lever 39 and the automatic diaphragm lever 4 rotate in the clockwise direction (arrow C) about the shaft 40 as the rotation center. To do. Therefore, with the movement of the automatic diaphragm lever 4, the diaphragm of the lens 1 is narrowed down to a predetermined diaphragm diameter, and at the same time, the mirror holding plate 36 interlocked with the mirror drive lever 39 is rotated counterclockwise (arrow D) by the pin 36a. The mirror 5 moves up from the image observing position to the photographing position. When the mirror drive lever 39 starts to rotate in the clockwise direction (arrow C), the pin 39b is released from the position where it pushes the mirror switch S2, so that the mirror switch S2 is immediately switched from the ON state to the OFF state. Also, the phase detection switch 44
When the mirror 5 descends and is in the image observing position (shown in FIG. 4), the switch is turned off, and when the mirror drive lever 39 is slightly rotated clockwise (arrow C), it is turned on immediately.
Further, the motor M2 continues to rotate and the rotation limiting claw 47 comes into contact with the stopper 48, that is, slightly before the completion of the mirror drive lever 39 rotating to raise the mirror 5 to the photographing position. OF again from ON state
The state is switched to the F state, the rotation limiting claw 47 contacts the stopper 48, and the rotation completion of the mirror 5 at which the rotation of the gear 46 in the counterclockwise direction (arrow B) is stopped is in the OFF state. Next, when the mirror 5 descends from the shooting position and returns to the image observation position after the shooting / recording operation is completed, the motor M2 moves in the clockwise direction (opposite arrow A) and the gear 46 and the mirror drive cam 45 also move in the clockwise direction. Rotate in the direction (opposite arrow B). The rotation of the cam 45 is counterclockwise (opposite the arrow C) against the biasing force of the mirror driving spring 43 on the mirror driving lever 39 via the roller 42.
Since a rotational force in the direction is given, the mirror holding plate 36 and the mirror 5 are rotated clockwise (opposite arrow D) to move the mirror down to the image observation position, contrary to the case of raising the mirror. The automatic diaphragm lever 4 also moves counterclockwise to the image observation position (opposite arrow C)
And the aperture diameter of the lens 1 is returned to the open state. At this time, the phase detection switch 44 reverses the operation at the time of raising the mirror, and changes the connection state from OFF to ON immediately after the start of the mirror lowering and from ON to OFF just before the completion of the lowering of the mirror. Further, the mirror switch contact S2, which is switched from ON to OFF during the mirror raising operation, is returned from the OFF state to the ON state again at the position where the mirror lowering is completed.

On the other hand, in the motor M2, the same rotating shaft is provided on the side opposite to the shaft on which the gear 51 for driving the above-mentioned quick return mirror mechanism and the automatic diaphragm mechanism is mounted, and the screw gear 52 is fixed. ing. The rotation of the motor M2 is converted into a right angle direction by the screw gear 52 and the meshing screw gear 53, and is transmitted as a reciprocating linear motion of the rack member 57 along with the gears 54, 55 and 56. A slide lever pin 57a that engages with a shutter charge pin 35b attached to the charge lever 35a of the shutter 35 is planted at one end of the rack member 57. In the state shown in FIG. 4, the slide lever pin 57a presses the shutter charge pin 35b to complete the shutter charge. The rotation of the gear 53 is made by the gear 55 and the one gear 58.
Informed to 59a. A cam disk 59b, a roller 60 and a clutch spring 61 are incorporated inside the gear 59a to form a one-way rotating clutch. Further, the gear 62 fixed to the same axis as the cam disk 59b is provided with a reverse rotation prevention 64 that rotates by a friction spring 63 that is pressed against and slides against the gear 62 to prevent rotation of the gear 62 (arrow J). Is set to A gear 65 is integrally connected to the shaft opposite to the gear 62, and this rotation is transmitted to the screw gear 68 via the gear 66 and the shaft 67. The screw gear 68 is arranged to drive the moving mechanism of the magnetic head, and is configured to transmit a rotation of a predetermined rotation angle in one direction each time one screen is photographed by the one-direction rotation / reverse rotation prevention mechanism described above. ing. The shutter 35 shown in the present embodiment is of a known focal-brain shutter mechanism and is of a type in which the start of traveling of at least the front curtain among the front curtain and the rear curtain is triggered by an electric signal. The shutter 35 has a well-known trailing-curtain running detection switch that turns on just before the trailing-curtain running is completed, and turns off when the trailing curtain moves to the run-ready position due to shutter charge (hereinafter,
Abbreviated as rear curtain switch. (Not shown) is provided.

When the motor M2 rotates counterclockwise (arrow A) to raise the mirror 5 from the state shown in FIG. 4, the rotation of the gear 51 is transmitted to the gear 50 and below, and at the same time, the screw gear is rotated. The screw gear 53 is rotated by 52 in the clockwise (arrow E) direction. This rotation is transmitted as a counterclockwise (arrow F) rotation of the gear 56 via the gears 54 and 55, and the rack member 57 meshing with the gear 56 moves in the direction of arrow G.
When the rotation of the motor M2 in the A direction rotates by a predetermined rotation angle regulated by the rotation limiting claw 47 and the stopper 48,
With the movement of the rack member 57, the slide lever pin 57a is moved to the retracted position where the shutter 35 can be operated. At this time, the gear 59a that meshes with the gear 58 is also a clock (arrow I).
Although it is rotated in the direction, it is slid against the cam disk 59b by the action of the one-way rotation clutch described above, the reverse rotation preventing claw 64 is caught in the gear 62, and the gear 65 is not rotated. next,
When the shutter 35 operates to end the photographing / recording operation, the motor M2 is started in the clockwise direction (opposite arrow A), and the descent operation of the quick return mirror 5 and the return of the automatic diaphragm mechanism are performed. The gear 54 rotates counterclockwise (opposite arrow E) and the gears 55, 56, 58 rotate clockwise (opposite arrow F), respectively. At this time, since the shutter charge lever 35a is in the position rotated in the H direction due to the end of traveling of the shutter curtain, the rack member 57 is rotated by the arrow G when the gear 56 is rotated in the clockwise direction (opposite arrow F). When moved in the opposite direction, the slide lever pin 57a and the shutter charge pin 35b again come into contact with each other, the traveling force of the shutter is charged, and the state is returned to the state shown in FIG. At the same time, the clockwise (determined by arrow A) rotation of the motor M2 is transmitted to the gear 59a via the gear 58 as rotation in the J direction. In this case, the clutch mechanism composed of the gear 59a, the cam disk 59b, the roller 60, and the clutch spring 61 rotates integrally due to the wedge effect, and the reverse rotation preventing claw 64 also contacts the pin 64a by the friction force of the friction spring 63. Until they come into contact, the gear 62 is rotated in the clockwise direction (arrow K) and the rotation of the gear 62 is not blocked.
As a result, the shaft 67 is rotated in the clockwise direction ((arrow L) direction by a certain angle only when the motor M2 is rotated so that the quick return mirror descends, and the magnetic head corresponds to a recording track of one screen by the configuration described later. Sent.

In the embodiment shown in FIG. 4, the shutter is operated when the shutter release is performed, and after the photographing and recording are performed, the magnetic head is moved along with the shutter charge when the quick return mirror is lowered. Although the magnetic head is moved, it may be moved when the mirror is raised. In this case, since the rotation of the motor is reversed, the operation effects of the one-way rotation clutch mechanism of the gear 59a, the cam disk 59b, the roller 60, the clutch spring 61 and the gear 62, the friction spring 63, and the reverse rotation prevention claw 64 are reversed. This can be achieved by configuring the direction. Further, the rotation direction of the shaft 67 is opposite to the arrow L, but this can also be achieved with the same configuration by changing the twist angle of the screw gear 68 and the screw gear 71 meshing with the screw gear 68. FIG. 5A is a perspective view showing another embodiment of the drive unit of the head moving mechanism in the main mechanism unit shown in FIG. 4, and FIG. In the embodiment shown in FIG.
After the release, the drive mechanism (58 to 68) for moving the magnetic head is set to operate without fail each time the motor M2 rotates to perform a shooting operation for one screen.
In this embodiment shown by a and b, when the shooting / recording operation is not successful, the head is not moved again by receiving the signal from the detection mechanism inside the camera body or the signal from outside the camera body, and the same operation is performed again. 2 shows a drive unit of a head moving mechanism capable of performing recording again on the track. The difference between this embodiment and the embodiment shown in FIG. 4 is that the cam disk 59b and the gear 65 are integrally fixed to the shaft in the embodiment of FIG. 4, but can be disengaged in this embodiment. Especially. As shown in FIG. 5a, this is transmitted by engagement of the counterclockwise (arrow J) rotating pin 65b of the cam disk 59b and the gear 65a, and normally this engagement is maintained by the biasing force of the spring 70. . The gear 65a is configured to be slidable in both the circumferential direction and the axial direction with respect to the shaft of the cam disk 59b as shown in FIG. 5b in section. The gear 65a moves when a signal is input to the plunger PL. The core is driven, and the plunger interlocking lever 69, which is rotatably fitted in the gear 65a, operates in the direction of arrow M against the biasing force of the spring 70 to move the gear 65a and the pin 65b.
Is disengaged. Therefore, when the plunger PL operates in response to a signal from an operation from outside the camera body or a detection inside the camera body, the shaft 67 keeps the gear 66a from engaging the reverse rotation preventing claw 64 even if the motor M2 is rotated. It does not rotate because it is not given enough torque to remove it. As for the signal to the plunger PL, the motor M2 moves the gear 59a through the arrow J.
Since it is set so as to rotate in the same direction for a short time at the time of start, when the gear 59a and the cam disk 59b rotate by a predetermined angle, the gear 65a and the pin 65b are re-energized by the biasing force of the spring 70. Engage. In the present embodiment, the gear 59a and the cam disk 59b are set to rotate 360 ° in one screen shooting, and the pin of the gear 65a is rotated.
There is also one engagement groove with the 65b. Further, when the plunger PL operates as described above and the magnetic head is not moved, the input to the counter indicating the number of photographing frames, which will be described later, is stopped and the numerical value displayed on the display unit 8 changes. do not do.

FIG. 6 is a sectional view taken along the line III-III of FIG. 1b, viewed from the rear of the camera of the embodiment of the present invention, showing a plane parallel to the magnetic recording disk shown in FIG. It is a thing. 7 is a perspective view partially showing a part of the head moving mechanism shown in FIG. 6, and FIG. 8 is a view showing an operation of a gear of the head moving mechanism.

The disk rotation motor M1 described above is provided with a battery 34 on the side of the pentaprism 15 in order to reduce the size of the camera.
In a device that records or reproduces video signals that are arranged concentrically on a disk-shaped magnetic disk, which is arranged at the upper position of the disk, in consideration of device compatibility, a constant rotation frequency (for example, 1800 rpm or It is desirable that the magnetic sheet (or magnetic head) rotates at a constant speed of rotation at 3600 rpm. In a device that rotates a magnetic sheet, as factors that disturb the uniform velocity of the rotation of the magnetic sheet, fluctuations in the load applied to the rotation driving means (motor) of the sheet and vibrations and external forces applied from the outside to the device are considered. Reducing these effects leads to higher constant velocity. On the other hand, in the device according to the present invention, the direct or indirect drive of the recording track switching mechanism, the shutter mechanism, the quick return mirror mechanism, the automatic diaphragm mechanism, etc. by the movement of the magnetic head is performed by the motor, so The certainty of the sequence operation is improved. If one motor is used to perform both of the rotating operation of the magnetic sheet and the driving operation of each mechanism of the camera, the size of the motor becomes large, and in a device such as a camera, which is required to be relatively small, In addition to restricting the arrangement of the mechanism and the circuit members, the load fluctuation of the latter has an adverse effect on the former constant-speed rotation. Therefore, in the embodiment of the present invention, a magnetic sheet rotating motor M1 that requires constant speed and high speed response, and a driving motor M2 for each mechanism of the camera that mainly requires driving torque are provided. Also, the motor M1 and the motor M2
In the operation mode, the driven member of the motor M2 is repeatedly started and stopped in accordance with the progress of the shooting sequence.
It is desirable for the magnetic sheet rotated by the motor M1 to rotate continuously not only during the shooting operation but also during the shooting preparation operation in order to enhance the quick-shooting property. Both of them should be driven by separate motors. Is a good idea. Motor M1
The disk drive shaft 25 connected to the belt 26 is formed of a material and shape having a large moment of inertia for also functioning as a flywheel for maintaining constant speed rotation. Reference numeral 89 denotes a sensor for detecting and controlling the rotation speed and phase of the disk drive shaft 25, which is composed of, for example, a photocoupler including a light emitting diode and a photoelectric conversion element, or a Hall element for detecting a magnetic point change. Therefore, at least one or more light reflecting portions or magnetic poles are formed on the outer periphery of the disk drive shaft 25 in order to generate a speed detection pulse. As shown in FIG. 4, the rotation of the drive motor M2 is transmitted to the screw gear 71 as the counterclockwise (arrow L) rotation of the screw gear 68 (clockwise rotation in FIG. 4). The gear 72, which is integrally fixed coaxially with the screw gear 71, is shown in FIG.
And a gear with a part of the tooth tip cut out as shown in FIG.
It meshes with gear 73. The gear 73 is integrally fixed to the shaft of the lead screw 77 together with the gear 74 and the ratchet wheel 78. The lead screw 77 is used to translate the support member 86, to which the magnetic recording head 30 is attached, along the guide shaft 87 by rotating in the direction of the arrow N. A gear 76 that meshes with the gear 74 is provided with a spring 76 that applies a rotational force in the opposite direction against the direction in which the lead screw 77 rotates in the forward imaging sequence from the start position. For the ratchet wheel 78, a locking claw 79 as shown in the perspective view of FIG. 7 is rotatably supported by the shaft 81, and the force of the locking spring 80 causes the ratchet wheel 78 to move clockwise (arrow direction). It is arranged so as to prevent rotation (opposite to N). Further, the lock release lever 82 that can be engaged with one end of the locking claw 79 opposite to the ratchet wheel is the shaft 85.
It is rotatably supported and is biased in the clockwise direction (arrow O) by the force of the lock release spring 84. Here, since the turning force of the lock release spring 84 is set to be larger than the turning force of the lock spring 80, when the lock release lever 82 rotates in the clockwise (arrow O) direction, one end 82a is One end of locking claw 79
79a is pushed and held at a position where the engagement between the locking claw 79 and the ratchet wheel 78 is always released. However, during normal shooting, as shown in FIG. 3, the cassette detection pin 83 attached to the tip of the release lever 82 comes into contact with the outer side portion of the cassette 20 and the release lever 82 rotates in the clockwise (arrow O) direction. Since it is blocked, a gap is created between the tip portions 82a and 79a, and the locking claw 79 is in a state capable of locking the ratchet wheel 78. Next, the operation of the head moving mechanism for switching the recording tracks of the magnetic recording head 30 shown in FIGS. 6 and 7 will be described below. As described above, the screw gear 68 rotates in a constant direction (direction of arrow L) during a predetermined operation of the photographing operation sequence of the camera (during mirror lowering and shutter charging in the embodiment of the present invention), and as a result, the gear 72 moves in the arrow direction. Rotate a fixed angle (120 °) in the M direction. Here, for example, the gear 72 is configured by leaving a gear having a total of 9 teeth, one tooth for every three teeth, and one tooth for every three teeth, and the gear 73 is a spur gear having ten teeth. The gear 72 is in a state where it does not receive the rotational force from the screw gear 68,
It is in the position of FIG. 8i and is in a state not meshing with the gear 73. At this time, the gear 73 is in the start position because the spring 76 applies a rotational force opposite to the feed direction (arrow N direction) to the lead screw 77 when the cassette is not inserted in the camera. When the cassette is inserted, the ratchet wheel 78 and the locking claw 79 are engaged, so the ratchet wheel 78 is engaged from the start position by the number of teeth of the ratchet wheel 78 (the start position immediately after inserting the cassette). It has been stopped. Since the number of teeth of the gear 73 and the ratchet wheel 78 are set to be the same (10 teeth) now, the position of the gear 73 is, regardless of whether the cassette is inserted, that is,
Regardless of the number of teeth of the ratchet wheel sent from the start position, it is in the position of Fig. 8i. Next, the above-mentioned motor M2
By the rotation of the screw gear 68,
72 starts rotating in the direction of arrow M, meshes with the gear 73 at the position of FIG. 8i, and continues rotating at the position of ii to rotate by a predetermined angle. In the embodiment of the present invention, the screw gear from the motor M2 causes the gear 72 to rotate by 120 °, that is, one tooth with the remaining teeth by the photographing operation of one screen.
The number of gear teeth up to 68 and 71 is set. Therefore, the tooth 72 rotates from the position of FIG. 8iii to the position of ', but the meshing with the gear 73 is disengaged in the middle position. The tooth 73 is about 45 in the direction of arrow N from the position
If the gear 72 is disengaged while rotating, the spring
The force of 76 rotates in the direction opposite to the arrow N. At this time, if the cassette is inserted in the camera, ratchet wheel 78
Rotates in a reverse direction from a position slightly rotated over one tooth (36 °) and engages with the locking claw 79 and the force of the spring 80 to rotate by one tooth of the gear 73 and the ratchet wheel 78. Position '
Stop at. This completes the feeding operation for one screen and returns to the state again. Therefore, the lead screw for one frame
The 77 is rotated by 1/10 rotation (36 °), and the magnetic recording head is moved by 1/10 of the lead pitch of the lead screw 77 (for example, 100 μ when the lead pitch is 1 mm), and this is the pitch of the recording track. It will be in the middle. In addition, when the cassette is not inserted during the above operation, or when the cassette is taken out after shooting a predetermined number of screen frames, the ratchet wheel 78 and the locking claw 79 are disengaged as described above. Support member 86 of magnetic recording head 30 by the force of spring 76.
Is returned to the starting position. Reference numeral 88 is a limit pin for contacting the support member when the support member returns to the start position, and is adjustably attached to the support substrate 19 of the camera body by a limiting pin for restricting the start position. S3 is an electric contact that is brought into contact with one end of the release lever 82 and is linked to the operation of the detection pin 83 depending on whether or not the cassette is inserted. When the cassette is not inserted, the release lever 82 is rotated in the clockwise direction (arrow 0). This is for resetting the numerical value of the above-mentioned frame number counter display to 0 according to the movement. With such a configuration, the magnetic recording head returns to the start position and the counter display becomes 0 regardless of the number of frames to be photographed when the cassette is taken out.
In an electronic recording type still camera that sequentially records video signals on a plurality of recording tracks of a disk-shaped magnetic recording medium like the device of the present invention, the mechanism for moving the magnetic head to switch the recording tracks is simply 1 It becomes more useful not only by moving the track position by a predetermined amount (for example, one track) each time the screen is photographed, but also by making it possible to replace and use a plurality of magnetic sheet cassettes.

Therefore, the magnetic head moving mechanism feeds the head one track at a time for each image-taking operation of one screen, and at the same time, returns to the start position among all the recording tracks according to the exchange of the cassette, and records again from there. It is useful to configure it to do so. On the other hand, when the motor drives the magnetic head and the same motor drives various mechanisms related to camera exposure (quick return mirror mechanism, automatic aperture mechanism, shutter charge mechanism, autofocus mechanism, etc.) , By simply adding the well-known magnetic disk drive head moving mechanism to the conventional still camera so that the same motor is used, the head can be returned to the start position when the cassette is replaced. This is very complicated because of the interlocking with the drive unit of each mechanism of the camera. If the motor moves the head moving mechanism in reverse, it takes time to restore the head, which impairs the quick-shooting property. Therefore, in the present invention, the moving mechanism of the magnetic head is driven by the driving motor of each mechanism of the camera only in the forward direction, and at the same time, when the movement of one screen is completed, the motor and the head moving mechanism are moved. Since it is configured to cut off the engagement of the head, the head can be returned to the start position from the track position of an arbitrary number of frames.
Further, since the head supporting member is returned by the spring for urging it toward the start position, there is also an advantage that the head for the cassette exchange can be quickly returned. This spring also has the effect of suppressing variations in position due to play in the head moving mechanism and achieving highly accurate head feed. As described above, by using the head moving mechanism as shown in the present invention, it becomes possible to move each of the mechanical parts of the camera and the head moving mechanism with a single motor, and to make the electronic recording type still camera compact and It can be manufactured at low cost.

Next, the release button and the mode switching ring portion will be described with reference to FIGS. 9 and 6. FIG. 9 shows FIG.
3 is a perspective view showing in detail the relationship between the mode switching ring and the release button in FIG. In FIG. 9, reference numeral 95 denotes a click spring of the mode switching ring 7, and a sliding brush 94a that constitutes a mode switching switch is fixed to the ring 7.
In the state shown in FIG. 9, the mode switching ring 7 is set to the single frame shooting mode, and when the mode switching ring 7 is turned counterclockwise, the brush 94a slides on the switching switch substrate 94b to switch to the continuous frame shooting mode. . On the contrary, when the mode switching ring 7 is rotated clockwise from the state shown in the figure to the (OFF) position, one end 91a of the switching lever 91 in which the lower projection 7a of the ring is rotatably supported by the shaft 92. And the switching lever 91 is rotated counterclockwise. As a result, 91b at the other end of the switching lever has a lower cutout 6 in the release button 6.
It enters into a and prevents the release button 6 from being pushed down for a predetermined stroke. Further, the pin 90 attached to the other end of the switching lever moves the cassette holder 23 from the position shown in FIG. 3 by a slight amount in the direction of separating the contact between the magnetic disk 20 and the recording head 30. Therefore, set the mode switching ring 7 to (OF
By setting it to the (F) position, you can lock the release button press to prevent shooting failure and power consumption due to careless pressing of the release button 6, and also to insert a disk-shaped magnetic recording medium into the camera. When the recording medium is left unused for a long period of time as it is, the magnetic recording head and the magnetic disk are attracted to each other, and especially when the recording medium is a flexible sheet, the deformation of the sheet is eliminated to prevent deterioration or failure of recording. You can

At this time, the pin 90 pushes the cassette holder 23 to move the cassette 20, and the detection pin 83 and the lock release lever 82 for discriminating the presence or absence of the cassette are small.
The switch S3 is set so as not to be affected. Reference numeral 93 is a spring for returning the lever 91, which holds the switching lever 91 in the non-operating position when the S mode and the C mode are set. When the mode switching ring 7 is set to the S (single frame shooting) mode and the C (continuous frame shooting) mode for normal shooting, as shown in FIG. 6, the slide lever is interlocked with the depression of the release button 6. 96 moves downwards against spring 97. At this time, in the middle of a predetermined release stroke, the pin 96a attached to the lever 96 first closes the ready switch S4, and by further pressing the release button 6, the pin 96b closes the release switch S5. The ready switch S4 is for operating the exposure meter circuit of the camera and the display circuit in the finder before starting the photographing operation, and for preliminarily rotating the magnetic disk by the motor M1, and by closing the release switch S5. The shooting sequence of the camera is started and the power supply of the motor M2 is turned on.

S6 is a contact point interlocking with the recording / non-recording changeover switch 9 described above, and when S6 is opened, the recording circuit from the magnetic head 30 to the magnetic disk 20 is deactivated.
Reference numeral 98 is a click spring of the changeover switch 9. Now, next, a sequence control system applied to the configuration described above will be described with reference to the following drawings. FIG. 10 is an operation time chart of the embodiment of the present invention, FIG. 11 shows a recording enable / disable signal generating circuit block for detecting the rotational fluctuation of the magnetic disk, and FIG. 12 shows a sequence control circuit block of the main mechanism. In an apparatus in which a magnetic disk is rotated at a constant speed to record an image signal for one field or one frame per track as in the present invention, a still image is captured and recorded on the magnetic disk from an image sensor. In this case, the recording disc must always rotate stably. Therefore, in the case of this device used for mobile use, the ready switch S4 is turned on by half-pressing the shutter release button and the motor is turned on immediately. It is not enough to give a signal that recording is not possible only until the magnetic disk rotates at a constant speed by M1, and for example, when shooting is performed during panning or in a moving vehicle, vibration may occur. There may be a case where a large disturbance causes a fluctuation in the rotation speed by the motor M1 to exceed an allowable value even within a short period of one provisional screen recording. The block diagram shown in FIG. 11 is a circuit for detecting the fluctuation of rotation even in such a case. The roles of the two jitter measuring circuits shown in FIG. 11 will be described below. First, in the 1-field-by-field jitter measuring circuit, for example, when the rotation of the disk drive shaft 25 has not reached a constant speed such as when the motor M1 is started, the jitter amount is in a period in which there is a large phase error or in one field. The jitter amount is measured for a certain period of time, and when it is integrated and the phase error exceeds the allowable value, a non-recordable signal is generated. Motor M1
Pulse generator 89 that generates multiple pulses based on the rotation of the
Of the FG (Frequency Generator) signal generated by the FG signal and the FG signal obtained from the synchronization signal generation circuit 120 built into the camera and the periodic signal 202 of approximately the same frequency are compared, and the phase difference between them is generated as a clock pulse. The phase difference is detected as the amount of jitter with the accuracy of the frequency of this clock using a clock with a sufficiently high frequency obtained from the instrument 101, and the detected clock is spread over one field by the jitter measurement circuit for each field. Counting continuously, and if this count exceeds a predetermined number, it means that the jitter is too large, and the record enable / disable signal 206 is set to NO.
The jitter measuring circuit 102 for each field can be reset immediately after the start of one field to measure the magnitude of the jitter for each field.

Next, the in-field jitter measuring circuit 103
Will be described. As described above, in the case of this device which is used for portable use, a large disturbance may be applied momentarily even after the disk rotation motor M1 reaches a constant speed. A large phase jump appears only within a very short time within one rotation of the drive shaft 25. In this case, the correction cannot be corrected by AFC etc. at the time of reproduction, and the reproduction screen becomes unsightly. Therefore, it is necessary to monitor the phase jump in a very short time within one revolution, and this is the circuit that realizes it. For example, the FG output is used to detect the rotation fluctuation within one revolution. If you use this
The cycle of the FG clock is measured every time, the time difference from the cycle one cycle before is detected as the amount of jitter, and if it exceeds the allowable value, it may be output as a warning signal. The output of the jitter measuring circuit 102 for each field and
A record enable / disable detector that inputs the output of the in-field jitter measuring circuit 103 to the OR circuit 104 and outputs a record disable signal if any one of the warning signals from the two types of jitter measuring circuits is output. Make up. Further, even if the recording is in progress, when the NO record enable / disable signal is output, the track is not moved and the same track is recorded again at the next photographing. The optimum value of the above-mentioned allowable value of the jitter may be determined by the AFC characteristic of the reproducing device.

Further, it is not always necessary to provide both of the above-mentioned two types of jitter measuring circuits, and it may be considered that only one of the measuring circuits is sufficient depending on the cause of the jitter. Next, the outline of the operation sequence in the embodiment of the present invention will be described with reference to FIGS. When performing normal shooting / recording, the recording / non-recording switch 9 is set to the recording ((Rec) position and S6 is turned on. First, the ready switch (SW) S4 linked to the release button 6 is turned on,
The release / ready signal generation circuit 116 causes the magnetic recording system (hereinafter simply referred to as the recording system) to send a disc rotation start signal 204
Is transmitted and the rotation of the disk is started by the motor M1. As described above, since the recording enable / disable signal 206 does not become Yes until the disk rotates at a constant speed and recording becomes possible, press the release button 6 and release SW
Even if (S5) is turned on, the release ready signal generation circuit 116 does not generate the release signal 208. The record enable / disable signal 206
After generating Yes, the release ready signal generation circuit 116 turns on the release signal by turning on the release SW (S5).
Generates 208. When the release signal 208 is generated, the motor drive timing control circuit 119 turns the motor drive circuit 121
Is issued to rotate the motor M2. At this time, the motor rotation direction control circuit 122 generates a signal for rotating the motor M2 counterclockwise. As described above, the motor M2 is driven to raise the mirror, and the mirror SW (S
2) is OFF and the mirror phase SW44 is ON. Mirror SW (S2)
Generates a signal for storing the aperture value signal from the lens 1 and the measured value of the photometry calculation control circuit 108 which has received the brightness information from the light receiving element 100. Also, turn on the mirror SW (S2),
The OFF signal is counted by the shooting frame number counter 111, and the shooting frame number counter display 112 also displays the number of shooting frames. 108
Is an exposure calculation control circuit that calculates the proper exposure and controls the rear curtain of the shutter.
It is also possible to generate a manual shutter time from 13. The shutter speed or aperture value is displayed in the viewfinder or the like by the display circuit 114. When the mirror finishes rising, the mirror phase SW44 turns off.
The motor drive timing control circuit is synchronized with this signal.
119 stops the motor M2. As a result, the shutter 35 is ready to run, but the image sensor 31a must discharge unnecessary electric charges by this time to prepare for starting the shutter. It is done as described below. If the CCD is synchronized with the vertical synchronizing signal immediately after the release signal is generated, the overflow control gate is controlled to discharge unnecessary charges. If it is an element such as MOS, it generates a clock signal for the sensor and resets each element. They are performed by the image sensor driving circuit 110 based on the output signal of the sensor timing control circuit 117. The drive pulse is generated by the drive pulse generation circuit 118, and the basic synchronization signal is generated by 120 synchronization signal generation circuits. The state of discharging unnecessary electric charges is continued until just before the opening operation of the shutter 35 is started. Now, the shutter 35 is now ready for opening. When the shutter timing control circuit 115 detects this state, a signal for opening the shutter in synchronization with the vertical synchronizing signal is transmitted to the shutter drive circuit 109, the exposure calculation control circuit 108, and the sensor timing control circuit 117. The image sensor stops discharging unnecessary charges and the shutter starts to open. The exposure calculation control circuit 108 starts counting the shutter time by the shutter open signal. Then, the image sensor is completely exposed. The exposure calculation control circuit 108 calculates the shutter time that gives the proper exposure,
Alternatively, the rear curtain start signal is transmitted to the shutter drive circuit 109 at the manual shutter time set by the shutter speed setting circuit. The trailing curtain starts, and at the same time when the running is completed, a trailing curtain signal is output to notify the end of exposure to the circuit block of the motor rotation direction control circuit 122 recording control signal generation circuit 123. The motor M2 rotation direction control circuit 122 outputs a signal to the motor drive circuit 121 so as to drive the motor M2 clockwise by the synchronizing signal immediately after the generation of the trailing curtain signal. Further, when the recording control signal generation circuit 123 receives the rear curtain signal, it outputs the signal charge in the image sensor in synchronization with the next synchronizing signal, but the energy when the rear curtain of the shutter stops is stored in the camera body. When the vibration is transmitted and the recording system is disturbed and it becomes impossible to record, since the recording enable / disable signal 206 is NO, no signal charge is generated and it is held in the image sensor. .
When the vibration does not affect, 206 becomes Yes and the sensor timing control circuit 117 and the sensor drive circuit 110 are operated in synchronization with the next synchronization signal to output the signal charge. The signal output from the image sensor is the preamplifier 105.
Are amplified by the color signal separation circuit 106 into R, G, and B color signals, and passed through the process circuit 170, and are subjected to processing such as black level ramping and waveform shaping, and output a recorded video signal.
It becomes 201 and is input to the recording system. Simultaneously with the end of the recording control signal 205 from the recording control signal generating circuit 123, the output of the motor M2 drive timing control circuit 119 and the rotation direction signal from the motor rotation direction control circuit 122 cause the motor M2 to start rotating clockwise. The motor M2 starts the descent of the mirror and at the same time charges the shutter and moves the track of the magnetic head. The mirror phase SW44 turns on as the mirror descends, and turns off just before the completion of the descent.
The mirror SW (S2) was also OFF until now, but it will turn ON when the mirror descends. When the mirror SW (S2) turns on and the mirror phase switch turns from on to off, the motor drive timing control circuit 119 stops the rotation of the motor and sends a signal to the release / ready signal generation circuit 116 to output the release signal 208. Reset. Motor rotation direction control circuit 1
22 is in a state of outputting a signal to the motor drive circuit 121 so that the rotation direction becomes counterclockwise in response to the synchronizing signal following the end of the trailing curtain signal and the end of motor rotation. This completes the shutter sequence, and prepares for the next release signal.

Further, when the energy of the trailing curtain of the shutter is stopped at the time of completion of the above-mentioned exposure, vibration is transmitted to the body or is transmitted to other vibrations, and the recording system is disturbed and recording becomes impossible. Then, it was stated that the recording signal output is not output from the image sensor, but it is output after it becomes a recordable state, but if the recording system recovers immediately and it recovers in several ws to a dozen ws, for example, the image sensor The signal charge inside is large due to the generated dark current, and S / N
Since the ratio is not reduced, a recording start signal is output and recording is performed. However, when the recovery of the recording system is delayed and becomes, for example, two fields or more, the signal charge held in the image sensor has a significantly reduced S / N ratio due to the dark current. When a preset time has elapsed after the occurrence of, the motor drive timing circuit 119 does not output the recording control signal 205, drives the motor M2, lowers the mirror, charges the shutter, and completes the shutter sequence. (In this case, since recording is not performed, the recording head does not need to be fed. Therefore, the head feed prohibition signal 203 is generated, the magnetic head is not moved by the above-described configuration, and the photographing frame number counter signal is not generated. In this case, since the image recording cannot be performed, a warning signal is displayed to the photographer. It should be noted that the disc rotation start signal 204 also displays a warning signal in the same manner until the disc is started and the disc rotation becomes constant and recording becomes possible, indicating that the release cannot be performed.

The operation sequence described so far is for the case of performing normal photographing and recording. However, the magnetic recording head is moved to a position corresponding to an arbitrary number of photographing frames (that is, idle feeding). If it is desired to record on that number of frames or after that number of frames, it is possible by setting the recording / non-recording switch 9 to the non-recording (NR) position. When the recording position is set to the non-recording position and S6 is turned off, after the release button is pressed, the recording control signal generating circuit 123 operates so that the release signal is immediately generated from the 116 regardless of the recording enable / disable signal 206. When the mirror is raised and the shutter travels, the recording control signal 205 is output regardless of the recording enable / disable signal 206, the recording video signal output 201 is not generated, and the motor M2 is rotated. The shutter is charged, the mirror is moved down, the head is moved, and the number of frames is counted.This operation is repeated until the magnetic head is moved without recording an image up to an arbitrary number of frames and then the changeover switch 9 is moved to the recording position Rec. When it is returned, it is displayed on the counter 8 at that time so that the normal photographing recording can be performed again.

As described above, according to the present invention, since recording is performed on the magnetic disk in a highly accurate rotation state, high quality still image recording is possible.

[Brief description of drawings]

FIG. 1 (a) is a front perspective view showing the external appearance of a camera body incorporating an embodiment of the device of the present invention. FIG.

FIG. 2 is a sectional view taken along line I-I of FIG. 1a.

FIG. 3 is a sectional view taken along line II-II of FIG. 1b.

FIG. 4 is a perspective view of a main mechanism section.

5A is a perspective view showing another embodiment of the drive unit of the head moving mechanism of the main mechanism section shown in FIG. 4B. FIG. 5B is a sectional view of the main part of FIG. 5A.

6 is a sectional view taken along line III-III in FIG. 1b.

7 is a perspective view of a main part of the magnetic head moving mechanism shown in FIG.

FIG. 8 is a plan view showing the operation of the mechanism shown in FIG.

9 is a perspective view showing a related mechanism of a mode switching ring and a release button shown in FIG.

FIG. 10 is a timing chart showing the relationship between the operation of the main constituent elements of the device of the present invention and the output of the control circuit.

FIG. 11 is a block diagram of a rotation speed control accuracy detection circuit of a disk-shaped magnetic recording medium applicable to the device of the present invention.

FIG. 12 is a block diagram of an operation sequence control circuit of the device of the present invention.

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[Procedure amendment]

[Submission date] April 22, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0001

[Correction method] Change

[Correction content]

The present invention relates to an electronic still camera for recording an image on a recording medium.

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] 0002

[Correction method] Change

[Correction content]

An object of the present invention is to realize high quality image recording in a camera which records an image signal on a recording medium.

In order to achieve the above object, in the present invention, an image pickup including an image pickup optical system and a photoelectric conversion means for photoelectrically converting an object image formed by the image pickup optical system into an electric video signal. A shutter means for adjusting the amount of exposure input to the imaging system,
A motor (M2) for driving or accumulating a driving force for driving one or more of the diaphragm means or the reflection mirror mechanism of the single-lens reflex finder, and the electric image signal photoelectrically converted by the photoelectric conversion means. Output means (110, 117) for reading and outputting from the system, recording means for recording the electric video signal output by the output means on a recording medium, output of the output means (110, 117) and driving of the motor (M2) The electronic still camera is configured so as to have a control means (119, 123) for controlling the timing of driving the motor or the output of the output means (110, 117) so as not to occur simultaneously.

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1a and 1b are a front perspective view and a top view showing the external appearance of an electronic camera (hereinafter abbreviated as a camera) according to the present invention. In the figure, Ca indicates the camera body.
Reference numeral 1 denotes an ordinary interchangeable lens, which is provided with an adjusting unit such as a distance adjusting ring and an aperture adjusting ring, which are necessary for ordinary photography.
A lens mount 3 is formed to be engageable with the rear end of the interchangeable lens 1. The automatic diaphragm interlocking lever 4 provided in the lens mount opening is engaged with the diaphragm lever 2 provided on the interchangeable lens side to constitute a known automatic diaphragm function. Reference numeral 5 is a quick return mirror (hereinafter referred to as a mirror) for extracting light from the finder. The release button 6 on the top surface of the camera is coaxially arranged with a mode switching ring to switch between one frame (S mode) and continuous frame (C mode), lock the release button, and shoot for a long time. It is designed to switch to the position (OFF) for when there is none (described later). Reference numeral 8 is a display for indicating the number of frames to be photographed, which is composed of a liquid crystal digital display for example.
It shows the track position of the head for recording on the magnetic disk. Reference numeral 9 denotes a recording / non-recording changeover switch for recording normally on the magnetic disk during the operation of the camera and for moving the head to the next frame without recording. That is, by setting the changeover switch 9 to the non-recording position (NR) and operating the release button, only the recording operation on the disc in the normal photographing operation is performed, so that the recording head is set to an arbitrary number of frames. The position of can be moved. Reference numeral 10 is a shutter speed setting dial, 11 is a shoe of a strobe device, and a contact 11a for transmitting and receiving a signal is provided. 12 is an eyepiece eyepiece.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0019

[Correction method] Change

[Correction content]

As described above, according to the present invention, it is possible to record a high quality image.

Claims (2)

[Claims] 1. A photographing optical system, an image pickup device for photoelectrically converting a subject image formed by the optical system into a video signal, and recording means for recording the video signal on a disk-shaped magnetic recording medium rotated by a motor. An electronic still camera having: a first motor for rotationally driving the disk-shaped magnetic recording medium;
A second motor for driving or accumulating a driving force of any one or more of a shutter unit, an aperture unit, or a reflection mirror mechanism of a single-lens reflex finder for adjusting the exposure amount of the image pickup device; Motor drive timing control means for controlling the rotation operation timing of the motor, and the motor drive timing control means controls the second motor so as not to rotate during the recording operation of the recording means. An electronic still camera. 2. The motor drive timing control means starts the rotation operation of the second motor in synchronization with a synchronization signal generated after the recording operation of the recording means is completed. The electronic still camera according to item 1.