JPH079140Y2 - Camera aperture reset mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a reset mechanism for an operating member that takes an operating position and a standby position by adsorbing and releasing an electromagnet.

[Conventional technology]

Conventionally, there is an actual open device 62-33025 as this type of device, and a reset mechanism of the aperture control device for a camera disclosed in this publication will be described with reference to FIGS.

In FIG. 8, an aperture lever 1 connected to an aperture ring (not shown) rotates counterclockwise about a rotation axis X1 in response to camera relays, and its movement is centered on a rotation axis X2. Is transmitted to the sector gear 5 via the lever 2, the shaft 3, and the lever 4 that rotate integrally with each other, and the sector gear 5 rotates counterclockwise about the rotation axis X3. Is transmitted to the ratchet wheel 7 via
The ratchet wheel 7 rotates counterclockwise about the rotation axis X4. Rotation of the ratchet wheel 7
By locking the locking lever 8 which is rotatable around X5 to the ratchet wheel 7, the diaphragm mechanism is stopped so as to obtain a predetermined diaphragm value.

Before the release, as shown in FIG. 8, an armature 9 is attached to the locking lever 8, the armature 9 is attracted to the magnet 10, and the locking lever 8 stands by at the standby position. As described above, when the aperture lever 1 starts moving in response to the release of the camera, the ratchet wheel 7 rotates counterclockwise, while the aperture value of the camera is monitored by a control circuit (not shown). This control circuit supplies a demagnetization signal to the magnet 10 at the timing when the proper aperture value is detected, and when the magnet 10 is demagnetized, the armature 9
Is released from the magnet 10. The locking lever 8 is the rotation axis
The ratchet wheel 7 is locked by rotating clockwise about the X5 by the spring force of the spring 11 to set the aperture value to a desired value, and then the shutter is opened to expose the film. That is, FIG. 9 shows a state in which the armature 9 of the locking lever 8 is attracted to the magnet 10. When the armature 9 is released from this attracted state (standby position), the locking lever 8 operates. When pin 9a and spring 20
There is a clearance between the lock lever 8 and b, which allows the locking lever 8 to move from the standby position to the operating position.

After the exposure, the armature 9 needs to be re-adsorbed to the magnet 10 in conjunction with the mirror that has been in the mirror-up position being mirror-down or in conjunction with the film winding. First
As shown in FIG. 10, when the lever 30 is dropped in conjunction with the above operation, the lever 28 is rotated in the counterclockwise direction in conjunction with it. The lever 28 has its tip 28a at the engaging portion 20c of the restoring lever 20.
, The restoring lever 20 is guided by the guide pin 22 and ascends in conjunction with the rotation of the lever 28. Since the pin 9a of the armature 9 is in contact with the spring portion 20b of the restoration lever 20, the pin 9a also rises as the restoration lever 20 rises, so that the armature 9 is attracted to the magnet 10 and the locking lever 8 moves to the standby position. I will be back.

Lever 30 even after armature 9 is attracted to magnet 10.
Is configured to drop further, so the recovery lever
20, the inclined surface 20d continues to rise while sliding on the adjusting pin 26, but at this time, since the spring portion 20b is engaged with the pin 9a, the spring portion 20b elastically deforms as shown in FIG. .

In other words, the armature 9 is pressed by the magnet 10 by the elastic force of the spring portion 20b, and when the lever 30 attracted by the magnet 10 is further dropped, the restoring lever 20 further rises while the inclined surface 20d slides on the adjustment pin 26. As a result, the tip 28a of the lever 28 and the engaging portion 20c of the restoring lever 20 disengage from each other as shown in FIG.
The restoring lever 20 is biased counterclockwise by the spring 24,
Moreover, since the movement of the lever 20 is restricted by the adjusting pins 25 and 26, when the lever tip portion 28a and the engaging portion 20c are disengaged, the restoring lever 20 moves back and is shown in FIG. Thus, the initial position is reached.

After the locking lever 8 is set, as shown in FIG. 12, when the lever 30 rises in conjunction with the mirror up and narrowing operation of the camera, the spring force of the spring 29 causes the lever 28 to rotate clockwise, and The restoring lever 20 is displaced rightward as shown in FIG. 12 while engaging the inclined surface 20e formed on the engaging portion 20c of the restoring lever 20 with the tip 28a of the lever 28 against the spring force of 24. As a result, the lever 28 and the restoring lever 20 are engaged as shown in FIG.

[Problems to be solved by the invention]

As shown in FIGS. 11 and 12, the lever 28 rotates clockwise due to the spring 29. The lever 28a is the inclined surface 2 of the restoration lever 20.
Since it rotates along 0e, the restoring lever 20 rotates around the pin 22 in the clockwise direction. At that time, pin 9a of the armature 9
There must be a sufficient distance between and 20b. Since the lever 30 moves up while the mirror is being raised and the aperture is being narrowed down, if the pin 9a of the armature 9 is raised, the locking lever 8 is disengaged from the ratchet 7 that locks the aperture, resulting in poor aperture control. Therefore, if the distance is sufficient, the stroke becomes large, and it is necessary that the tip portion 28a of the lever 28 has a large stroke. Therefore, the stroke from the lever 30 to the armature 9a had to be greatly expanded, and a large space was required. Restoration lever 20
Since the engaging portion 20c of is in the shape of a corner with the inclined surface 20e,
It is easily worn, and when worn, the engagement is disengaged quickly, which may cause a reset failure. Also, the enlargement ratio is large,
Since the fixing pin 26 is slid on the inclined surface, the driving force of the lever 30 is large. Also, the number of parts is large due to expansion, and the adjustment pin
I needed 25, 26, etc.

The purpose of the present invention is to provide a double-sided cam on the interlocking lever 30 as shown in order to solve such a conventional problem, and to reset the aperture by a release lever that comes into contact with the cam surface when the operating member reciprocates. Is to provide a reset mechanism that does not affect the state of the operating member and efficiently resets with a small number of parts.

[Means for solving problems]

In order to solve the above problems, in the present invention, the camera winding,
A double-sided cam is provided directly on the member that interlocks with the mirror-down operation, and the release lever is operated by the upper surface of the cam and the lower surface of the cam in response to the reciprocating motion of the member.

[Action]

In the present invention, since the release lever directly contacts the member interlocking with the hoisting mirror down of the camera, the mechanism is not complicated as in the conventional case, the shape of parts is simple, and the reset portion is not an elastic body. A reliable reset is possible.

〔Example〕

FIG. 1 is a perspective view of an aperture reset mechanism arranged on a side wall of a mirror box of a camera according to an embodiment of the present invention.
In FIG. 1, the diaphragm mechanism arranged on the substrate 150a is
It is composed of a magnet 116, a locking lever 80 attracted and released by the magnet 116, a reset lever 230 that interlocks with the locking lever 80, and a restoration lever 200 that drives the reset lever 230. And this restore lever 2
A drive lever 30 for driving 00 is pivotally supported on the side wall of the mirror box. The substrate 150a is arranged vertically on the side wall of the mirror box.

The reset mechanism for the aperture control will be described below.

FIG. 2 is a view arranged in a plane in FIG.
0 indicates the initial position, and the locking lever 80 is in the standby position. At this time, the restoration lever 200 is interlocked with the mirror down and / or the film winding. As shown in FIG. 3, the interlocking lever 30 has a rising portion 30 provided at the tip thereof.
The a slides on a pin 210 provided at the tip of the restoring lever 200 and acts as a cam.

As shown in FIG. 4, the board 150b is provided between the boards 150a and 150b.
A segment gear 111, an idle gear 112, an idle gear 113, and a ratchet gear 114 are provided on the top.

Here, when the shutter lever is relayed and the aperture lever 1 interlocking with the aperture ring starts to drive, the aperture control interlocking pin 110a and the segment gear 11 on the aperture lever
1, transmitted to the idle gear 112, the idle gear 113, and the ratchet gear 114. The ratchet gear 114 is coaxially fixed with a disk having a ratchet 114a and a slit hole 114b for optically detecting the rotation of the gear. The position of the aperture ring is transmitted to the ratchet wheel 114 as described above, optically detected by the photocoupler 115, and then monitored by a control circuit (not shown), and controlled when the aperture value of the aperture ring matches the desired aperture value. The circuit sends a degauss signal to magnet 116. As a result, as shown in FIG. 5, the magnet 116 is demagnetized, the armature 117 attracted to the magnet is released from the magnet by the spring force of the spring 118, and the locking lever 80 stops the rotation of the ratchet wheel. The aperture ring has a desired aperture value.

Next, the mirror-up operation is performed, the shutter runs, the film is exposed, and then the mirror-down is performed and the film is also wound. For example, when the interlocking lever 30 rotates clockwise in conjunction with the mirror down, the rising portion 30a of the interlocking lever 30 is arranged in an inclined surface so as to form a linear cam. Initially, the pin 210 moves on the upper surface of the rising portion 30a so as to climb the cam, and pushes the restoring lever pin 210 upward.

Then, as shown in FIG. 5, the restoration lever 200 and the magnet reset lever (hereinafter, referred to as Mg reset lever) 230 rotate clockwise against the restoration lever return spring 220. The restoration lever 200 is in contact with the reset pin 250 on the Mg reset lever 230, and the reset idle spring 240
Are always in contact with each other. An Mg reset spring 260 is fixed to the Mg reset lever 230 in the form of an internal force. By turning the Mg reset lever 230 clockwise,
The reset spring 260 presses the pin 80a implanted in the locking lever 80 against the spring 118, and the locking lever 80 is moved to the magnet 1
Securely adsorb to 16.

In FIG. 5, when the interlocking lever 30 further moves in the clockwise direction, the restoring lever pin 210 is disengaged from the cam plane of the rising portion 30a of the lever 30, and the restoring lever 200 becomes the Mg reset lever 2
It is rotated counterclockwise together with 30 by the reset return spring 220, and is in the initial position state as shown in FIG. 2, so that the locking lever 80 has been reset reliably.

When the next relay starts and the aperture is narrowed down or the mirror is raised, the interlocking lever 30 that was moving clockwise as described above.
Returns counterclockwise. When the lever 30 starts rotating counterclockwise, the restoring lever pin 210 slides on the lower surface cam of the rising portion 30a of the lever 30 as shown in FIG.
Push down.

Then, as shown in FIG. 7, the restoring lever 200 rotates counterclockwise against the force of the spring 240. Mg reset lever 230
Does not rotate following the restoration lever 200 because it hits the upright bent portion 150c of the substrate 150a, and only the restoration lever 200 has the spring 24.
Rotate against 0.

Furthermore, when the interlocking lever 30 rotates counterclockwise and disengages from the restoration lever pin 210, the restoration lever pin 210
It rotates clockwise until it contacts the reset pin 250.

Thus, in this embodiment, the armature 117 is the magnet 1
After being absorbed by 16, the restoration lever 200 and restoration lever pin 2
Although 10 is moved by the linear cam surface of the rising portion 30a of the lever 30, the reset lever 230 resets the locking lever 80 only when Mg is reset, so narrow down the locking lever 80 that locks the ratchet. You will not accidentally reset the shutter before driving. Further, the clearance between the reset spring 260 on the reset lever 230 and the reset pin 80a on the locking lever 80 is the minimum clearance because the reset lever moves only at the time of reset. Therefore, restore lever pin
The 210 strokes are minimal and good.

In addition, a reset return spring 220 and a reset lever spring 240
Can only return the lever, so the ability is minimal. Therefore, the influence of the rising portion 30a on the lever 30 on the linear cam surface is extremely small, and the movement of the lever 30 cannot be prevented. In this embodiment, since the resetting is performed only by the reciprocating motion of the lever 30 which is interlocked with the operation of the camera, the mechanism is simple.

The reset mechanism of the present invention can be applied not only to the aperture control of the camera but also to various devices other than the camera, such as a device for pressing the armature against the magnet.

[Effect of device]

According to the present invention, in the reset mechanism that controls the aperture of a single-lens reflex camera by film winding and mirror down, the reciprocating motion of the interlocking lever linked to the operation of the camera causes the upper or lower surface of the cam on the lever to move. Since the reset pin is moved and the Mg locking lever is reset only at the time of reset, there is no reset malfunction, and space stroke and charge capacity are minimized. Moreover, since the mechanism is simple, the number of parts is small. Therefore, the responsiveness of resetting the aperture of the camera is improved, and in the case of continuous shooting, the next operation of the camera, for example, the photometry operation, the distance measurement operation, etc. can be quickly performed.

[Brief description of drawings]

FIG. 1 is a perspective view of an aperture reset mechanism of a camera which is an embodiment of the present invention, FIGS. 2 and 5 and 7 are front views of the aperture reset mechanism, and FIGS. The figure shows the aperture lever that works with the aperture reset mechanism of the camera.
FIG. 4 shows a front view of the interlocking lever, and FIG. 4 shows an explanatory view of an aperture control section of the aperture reset mechanism of the camera. FIG. 8 is a perspective view showing a conventional aperture control mechanism, and FIGS. 9 to 12 are front views of the aperture reset mechanism of the aperture control mechanism. [Explanation of symbols of main parts] 1 ... Aperture lever, 7; 114 ...... Latiette, 10; 116 ......
Magnet, 30 …… Interlocking lever, 20; 200 …… Restoring lever, 8; 80 …… Locking lever

Claims (1)

[Scope of utility model registration request] 1. An interlocking lever pivotally supported by a side wall of a mirror box of a camera and provided with a double-sided cam, a demagnetizable magnet provided on a base arranged perpendicularly to the side wall of the mirror box, and the base. An armature that is axially supported on the magnet and that attracts the magnet, and a locking lever that locks the aperture of the camera; a reset lever that is axially supported on the base and that interlocks with the locking lever; Is pivotally supported coaxially with the shaft of the double-sided cam, and when the interlocking lever rotates in the first direction, the upper surface of the double-sided cam slides in contact with the same. A pin for sliding contact is provided, and a restoring lever for driving the reset lever is provided. After exposure of the photographic film, the interlocking lever rotates in the first direction, and according to the operation, Top pushes the pin surface cam, the pin is restored lever pivot provided, said reset lever is rotated in response to the operation,
According to the operation, the locking lever is rotated, and the armature is attracted to the magnet to reset the aperture of the camera.