JPS63113434A - Charge driving device for motor-driven camera - Google Patents

Abstract

PURPOSE:To enable high-speed continuous shooting by carrying out respective charging operation such as the restoration of a stop control mechanism, mirror- down operation, and shutter charging simultaneously in parallel. CONSTITUTION:A stop lock lever 66 and ratchet gear 65 are disengaged from each other right before charging operation, i.e. in the beginning of the rotating operation of a charge cam 90. Therefore, the respective charging operation such as the restoration of the stop control mechanism, mirror-down operation, and shutter charging are carried out simultaneously in parallel and the time required for one operation of the camera at the time of photography, i.e. from the shutter releasing of the camera to the completion of charging operation is shortened. Thus, the fast continuous shooting is enabled.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a charge drive device for charging the mirror, shutter, and aperture control mechanism of a motor-driven camera.

[Conventional technology]

Traditionally, still cameras that use silver halide film perform a series of operations, the so-called charging operation, in preparation for the next shot after completing a specified exposure to the film, such as lowering the mirror, charging the shutter, restoring the aperture control mechanism, and winding the film. However, when the charging operation is performed by a motor, the above-mentioned operation is not performed all at once, but is performed over time in order to equalize the load on the charging motor. In particular, restoring the aperture control mechanism involves two operations: restoring the aperture locking lever that locks the aperture control member and restoring the restoring lever to restore the aperture locking lever. After the exposure is completed, the first action is to restore the aperture locking lever in conjunction with the mirror down, and then the second action is to move the restoration lever to the center in conjunction with film winding and shutter charging. The aim was to equalize the load on the charge motor.

[Problem that the invention seeks to solve]

For this reason, conventionally, when shooting in continuous shooting mode, there was a limit to how much the frame rate could be increased.

The present invention focuses on the fact that during the charging operation of a still camera that uses conventional silver halide film, the film winding operation is the one that places the most load on the charge motor. The purpose of the present invention is to obtain a charge drive mechanism that is suitable for electronic still cameras that do not have high speed cameras and is capable of high-speed snapshots.

[Means for solving problems]

For the above purpose, in the present invention, the restoration of the aperture control mechanism and the charging operations of mirror down and shutter charging are simultaneously performed in parallel.

For this reason, the charge cam (
The mechanism is such that the diaphragm locking lever (66) and the ratchet gear (65) are unlocked at the beginning of the rotation operation of the diaphragm locking lever (66).

[Effect]

In the above configuration, the aperture control mechanism is restored and charging operations such as mirror down and shutter charging can be performed simultaneously in parallel. Since the time required from releasing the camera to completing the above-mentioned charging operation can be shortened, the frame rate can be increased when shooting in continuous shooting mode, making high-speed continuous shooting possible. .

〔Example〕

Figure 1 is an external view of an electronic still camera equipped with a charge drive mechanism according to the present invention, in which (1) is the camera housing, (2) is the lens mount, (3) is the white balance switch, and (4) is inside the viewfinder. Display light switch, (5)
is the shutter speed setting dial, (6) is the shooting mode selection ring, (7) is the release button, (8) is the ring that switches between frame-by-frame shooting and continuous shooting, and locks the release button, and (9) is for the flash. The hot shoe (10) is the exposure compensation dial, (11) is the back cover opening/closing button, and (53a) is engaged with the aperture lever (16) provided on the interchangeable lens (15) side to perform the known automatic aperture function. It is an automatic aperture interlocking lever for configuration.

FIG. 2 is a perspective view of the main mechanisms of the camera shown in FIG. 1, including a mirror mechanism, an aperture control mechanism, a shutter charge mechanism, and a charge drive mechanism for charging the above mechanisms.

FIG. 2 shows a state after the completion of the shadow removal operation and before a new photographing operation is started.

First, the operation from when the release button (7) of the camera (1) is released to when the aperture (not shown) of the lens (15) starts its aperture operation until the aperture is controlled will be explained. (21)
is a combination magnet, and when the second release port (7) is pressed at the start of photography, power is momentarily supplied by a switch (not shown) and the armature (22) is released from adsorption.

The armature (22) is the armature lever (23)
It is rotatably supported by an armature lever (23) by a pin (24) implanted in the armature lever (23). Since the spring (101) is applied to the armature lever (23), the armature lever (23) rotates counterclockwise (arrow A) about the shaft (25). The key lever (26) rotates around the shaft (25) and is biased clockwise (arrow B) by the biasing force of the spring (102).
Bent part (23a) of lever (23) and key lever (26)
The other end (26a) is in contact with the other end (26a). (28) is a charge lever that charges the shutter, mirror drive section, and aperture control mechanism section after photographing is completed. Charge lever (2
8) is rotated around the shaft (31) in the clockwise direction (arrow C) by the biasing force of the spring (104), but the key part (26b) of the key lever (26) is not connected to the charge lever ( Since the charge lever (28) is engaged with the bent portion (28C) of the charge lever (28), rotation of the charge lever (28) is prevented. The armature lever (23) moves counterclockwise (
When rotated in the direction of arrow A), the key lever (26) also moves to the shaft (25).
Rotate counterclockwise (arrow A) around the key lever (2).
6) and the charge lever (28) are disengaged, and the charge lever (28) is moved clockwise (arrow C) around the shaft (31).
Rotate to. The shutter charge lever A (33) rotates around the shaft (32).

The shutter charge lever B (37) rotates around the shaft (36), and a pin (38) is installed at the other end to engage with the bent portion (39a) of the charge slide lever (39) of the shutter (40). has been done. Charge lever (28)
When the charge lever (2) rotates clockwise (arrow C), the
8) end (28a) and the shutter charge lever A (
33) is released, the shutter charge lever A (33) can freely rotate counterclockwise in the direction of arrow D) around the shaft (32), and the pin (35) and shutter charge lever B (37)
) is released and the shutter charge lever B (
37) is rotatable in the counterclockwise direction (arrow E) around the shaft (36), and includes a pin (38) implanted in the shank-charge lever B (37) and a charge slide lever (39) of the shutter (40). is no longer engaged with the bent portion (39a), and the shutter (40) becomes operable. (
Reference numeral 107) is a drive spring for the aperture control mechanism, and the state shown in FIG. This state is maintained by locking the end (45a). When the charge lever (28) rotates clockwise (arrow C) around the shaft (31),
Due to the return force of the diaphragm control system drive spring (107), the slide lever (45) moves in the left direction (arrow F) in the figure.
The lever (48) is a slide lever (45) and a pin (46).
), the sector gear (50) rotates clockwise (arrow G) around the shaft (47).
The lever (4) is connected by the pin (50a) installed in the gear.
8), so the lever (48) is rotated clockwise (
When rotated in the direction of arrow G), the sector gear (50) rotates around the shaft (49).
Rotate clockwise (arrow H) around . Lever (51
) is the same as the rotation axis (49) of the sector gear (50), and they move together due to the biasing force of the spring (106), so the lever (51) is also connected to the axis (49) of the sector gear (50).
49) in a clockwise direction (arrow H). Since the lever (53) is engaged with the end (51a) of the lever (51) by the pin (54) implanted in the lever (53), the lever (51) is rotated clockwise around the shaft (49). direction(
When rotated in the direction of arrow [1], the lever (53)
By the return force of 07), the stepped neck 109.110) fixed to the camera body is used as a guide to move downward (in the figure).
the end (53) of the lever (53).
a) The aperture lever (16) of the lens (15) engaged with
) is also moved downward (arrow K) by the return force of the spring (111) supported within the lens, and the aperture (not shown) of the lens (15) begins to narrow down. On the other hand, the movement of the sector gear (50) is transmitted to the gears (57), (64) via the gears (55), (56). A slit plate (59) is fixed to the gear (57), and is arranged so as to rotate at right angles to the optical path between the light emitting element and the light receiving element of a known photo ink converter (60). Slit plate (
59) blocks or passes the light flux from the light emitting element of the photo ink club (60), so the photo ink club (60)
The light receiving element 60) receives the pulse of light and outputs a pulsed current. The number of output pulses is compared with the number of pulses corresponding to the aperture value determined in advance by the photometry calculation circuit (not shown), and when the aperture has been narrowed down to the specified position, a signal is sent from the aperture control circuit (not shown). When a signal is sent to the aperture control magnet (70), the armchair (69) is released from adsorption, and the locking lever (66) is rotated through the pin (68) implanted in the locking lever (66). (67)
The locking portion (6) of the locking lever (66) rotates clockwise (arrow L) by the urging force of the spring (109),
6a) jumps into the ratchet gear (65) and stops rotating. The gear train stops when the ratchet gear (65) is locked, and the aperture lever (5) of the camera (1) is stopped.
3) will also stop, so move the aperture lever (16) of the lens (15).
) is also locked, and the aperture (not shown) of the lens (15) is fixed in a predetermined position.

Next, the raising operation of the mirror (76), which is performed in parallel with the aperture control operation described above, will be explained.

The mirror holding plate (75) that holds the mirror (76) is rotatably supported by rotating shafts (75a) (75b) attached to the left and right, and there is a shaft on the shaft (75a) side for removing looseness and maintaining the posture. A weak spring (113) is applied. (
Reference numeral 71) denotes a mirror drive lever, which engages with a pin (74) implanted in the mirror holding plate (75) and is rotatably supported around a shaft (73). Further, a signal pin (72) is installed at one end of the mirror drive lever (71) to activate a mirror switch (78) for detecting completion of the mirror raising. The spring (1) hung on the shaft (73)
12) is a mirror drive spring. When the slide lever (45) moves to the left (arrow F) from the state shown in FIG. 2 with the release operation of the camera, the mirror drive lever (
71) is rotated clockwise (arrow M) about the shaft (73) by the biasing force of the mirror drive spring (112), and one end (71a) of the mirror drive lever (71) pushes up the pin (74), so that the mirror The holding plate (75) has a shaft (75a) (
The mirror (75) rotates counterclockwise (arrow N) around the rotation center 75b), and the mirror (75) rises from the image observation position to the image photographing position. Mirror drive lever (71) is turned clockwise (arrow M)
and just before completing the mirror raising operation, the pin (72
) presses one end of the mirror switch notch (78), so the mirror switch (78) is switched from the OFF state to the ON state. The mirror holding plate (75) further rises and comes into contact with a limit (not shown), completing the mirror raising operation.

Next, the operation of simultaneously lowering the mirror, charging the shutter, and charging the aperture control member (bringing it into the state shown in FIG. 2) after the completion of video recording will be described. (95) is a charge limiting claw, and one end is a phase detection switch (97).
) is implanted with a pin (96). The state of the limit claw (95) before charging is the same as that of the charge lever (2).
The end (28c) of the limiting claw (95)
95a) is pressed, and the charge limiting claw (95) is moved to the shaft (94).
) in the counterclockwise direction (arrow P) against the biasing force of the spring (115), and the claw portion (95b) of the limiting claw (95)
is released from the groove of the limiting cam (85), and the pin (9
6) is in a chargeable state by pressing the contact piece (97a) of the phase switch (97) to switch the phase switch (97) from the OFF state to the ON state. After video recording is completed, when power is supplied to the charge motor (79), the motor (79)
) rotates counterclockwise (arrow Q), so the gear (80
), the gear (81), the gear (83), and the gear (84), and the charge cam (90) coaxially fixed to the gear (84) also rotates counterclockwise (arrow R). Here, in Fig. 2, the charge cam (90) is rotated counterclockwise (
The aperture control magnet reset lever (93) operates in conjunction with the charging operation performed by arrow R).
) and the operation of the charge lever (8B), see Figure 2.
This will be explained using FIG. 3-1, FIG. 3-2, FIG. 3-3, and FIG. 3-4. In FIG. 2, (91) is a magnetic reset plate, which is fixed coaxially with the charge cam (90) and rotates together with the charge cam. (93) is a magnetic reset lever that rotates around a shaft (92) and is biased clockwise (arrow S) by a spring (116). (88) is a charge lever that rotates around a shaft (87). FIG. 3-2 shows the state after the completion of video recording and before the start of charging. Since the aperture control operation is slow, the locking lever (66) is in the state of locking the ratchet gear (65). The magnetic reset lever (93) is biased clockwise around the shaft (92) by the spring (116), but the reset lever (
The end (93a) of the reset plate (91) is in contact with the rising part (91a) of the reset plate (91), and the reset lever (93)
) and the end (66) of the locking lever (66).
b), so that the locking lever (66) can reliably lock the ratchet gear (65).

Next, before starting the charging operation, it is first necessary to release the lock between the locking lever (66) and the ratchet gear (65) in the state shown in FIG. 3-2. The operation will be explained using FIGS. 3-2 and 3-3. Charge motor (79)
(, Fig. 2), the charge cam (90) rotates counterclockwise (arrow R) in Fig. 3-2, so the reset plate (90) is integrally supported with the charge cam (90).
1) also rotates counterclockwise. After a slight rotation, as shown in Figure 3-3, the rising part (91a) of the reset plate (91) and the end (91a) of the reset lever (93)
3a), and the reset lever (93) is rotated clockwise around the shaft (92) by the spring (116), so the end (93b) of the reset lever (93) locks into the locking lever ( 66) and the armature (66a”) attached to the locking lever (66).
69) is attracted to the magnet (70), and the locking lever (6
6) and the ratchet gear (65) are released.

At this time, the shape of the charge cam (90) is set so that there is a gap between the pin (89) installed in the charge lever (88) and the charge cam (90), so the charging operation is not possible. Not done yet.

Next, the charging operation will be explained using FIGS. 3-4. When the charge cam (90) further rotates from the state shown in Figure 3-3, the charge cam (90) and the pins (8) come into contact, so the charge lever (88) rotates clockwise around the shaft (87). Then, the tip of the charge lever (88) pushes the charge lever (28) to the right (arrow T) to start the charging operation, and as shown in Figure 2, the bent part (28C) of the charge lever (28) pushes the key lever (2G) ), charging operations such as lowering the mirror, charging the shutter, and restoring the aperture control mechanism are completed at the same time. (
(Fig. 3-4) The charge cam (90) further rotates from the state shown in Fig. 3-4, and returns to the state shown in Fig. 3-1, that is, Fig. 2, after exactly one rotation, completing the operation.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to shorten the time required for the charging operation, and therefore, the frame speed for snapshot photography can be increased. In addition, since the reset operation of the aperture locking mechanism is performed at the beginning and end of the charge cam's rotational operation, it is possible to perform a reliable reset operation, and since the structure is integrated and simple, there are fewer operational problems. , there is no need for adjustment, and the device can be made smaller.

[Brief explanation of the drawing]

Fig. 1 is an external view of an electronic still camera equipped with a charge drive mechanism according to the present invention, Fig. 2 is a perspective view of the main mechanical parts, and Fig. 3 is a diagram showing the locking of the aperture locking magnet and the operation of the reset mechanism. It is. (Explanation of symbols of main parts)

Claims (1)

[Claims] In a camera that is charged by a motor drive, there is a charge cam that rotates by contacting a pin installed in a charge lever, a reset plate that is supported so as to rotate together with the charge cam, and a reset plate. A charge drive device for a motor-driven camera, comprising a reset lever that resets an aperture locking lever by coming into contact with or releasing contact with a protrusion provided on the circumference of a plate.