JP3062689B2 - Shutter setting mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shutter setting mechanism for operating a camera shutter control mechanism on a set side.

[0002]

2. Description of the Related Art FIG. 4 shows an example of a conventional camera shutter setting mechanism. In the shutter setting mechanism shown in the drawing, the support plate 32 and the pressure plate 33 are rotated by rotating the pressure lever 31 around the shaft 31a in a clockwise direction against the spring 34 by a known method. Proceeding rightward, it pushes the iron piece shafts 26a and 29a provided on the open-side iron piece lever 25 and the closed-side iron piece lever 28, respectively. Further, the open-side iron piece lever 25 and the closed-side iron piece lever 28 move the shaft 25a and The open side iron piece 26 and the closed side iron piece 29 are rotated around the springs 27 and 30 around 28a, respectively.
It contacts the iron cores 21b and 23b of the electromagnets 21 and 23. Then, the locking portion 34b of the release lever 31
The setting operation is completed by locking the locking portion 31c.

Next, in conjunction with the camera release operation, energization of the coils 21a, 23a is started by a known method, and the iron cores 21b, 23b are magnetized, and the iron piece 2
6, 29 are adsorbed. Thereafter, in conjunction with the mirror-up operation, the release lever 35 rotates clockwise around the shaft 35a against the spring 36, and the locking portion 34b and the pressure lever 3
The engagement with the first engaging portion 31c is released. Thus, the pressure lever 31, the support plate 32, and the pressure plate 33 rotate counterclockwise by the bias of the spring 34 and retreat. In this state,
The iron cores 21b and 23b are demagnetized by sequentially interrupting the energization of the coils 21a and 23a, and the open-side iron piece lever 25 and the closed-side iron piece lever 28
7, 30 and each shaft 25a and 28a
, The protrusion 25b of the open-side iron lever releases the lock of the open blade group, and after the open blade group is opened, the protrusion 28b of the closed-side iron lever is closed. The lock of the group is released, the closing blade group performs a closing operation, and a series of exposing operations is completed.

[0004]

However, when the conventional shutter setting mechanism attempts to reduce the size of the shutter in the vertical direction in FIG.
Despite the constant urging force of 7, 30 the rotating shafts 25a, 28 of the open-side iron lever 25 and the closed-side iron lever 28
a, and the distance between the open and closed side iron pieces 26, 29 is shortened.
The holding power of 1, 23 becomes insufficient. If the operation is performed in such a state, there arises a problem that the electromagnets 21 and 23 cannot hold the iron pieces 26 and 29 and a reliable exposure operation cannot be performed. When the voltage is increased to increase the holding power, the power consumption increases as a result. Further, when the force of the iron piece lever spring is reduced, there is a problem that the time until the locking of the blade group is released varies and the exposure time becomes unstable.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an open-side iron piece lever and a closed-side iron piece lever which are arranged such that the levers are overlapped with each other while maintaining the lever length. The side electromagnet was provided between the support shaft of the closed iron lever and the closed electromagnet, and the closed electromagnet was provided between the support shaft of the open iron lever and the open electromagnet.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An open iron lever rotatably supported to open and control a group of open blades for starting exposure, and rotatable for closing and controlling a group of closed blades to end exposure. A closed-side iron piece lever pivotally supported on the opening side, an open-side electromagnet that controls the attraction and release of the open-side iron piece lever, and a closed-side electromagnet that controls the attraction and release of the closed-side iron piece lever. The closed side electromagnet is arranged at a position between the position of the closed side electromagnet and the position of the open side electromagnet, and the open side electromagnet is provided at a position between the position of the support shaft of the closed side iron lever and the position of the closed side electromagnet. Configuration.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIGS. 1, 2, and 3 are views for explaining an embodiment of a shutter setting mechanism according to the present invention. FIG. 1 is a plan view showing a state before the start of setting, and FIG. FIG. 3 is a sectional view of a main part of this embodiment. In each figure, the open-side electromagnet 1 includes a coil 1a and an iron core 1b. The closing electromagnet 3 includes a coil 3a and an iron core 3b.
The open iron lever 5 is rotatable about a shaft 5a. An iron piece 6 is supported on the tip side (upper end side in the figure) of the open-side iron piece lever 5 via an iron piece shaft 6a. A spring 16 is provided between the open side iron piece lever 5 and the iron piece 6 so that the iron piece 6
It is urged in the direction to contact with. Open iron lever 5
Is always urged in the counterclockwise direction by a spring 7 and engages with an unlocking lever (not shown).
b.

The closing iron lever 8 is rotatable about a shaft 8a. An iron piece 9 is supported on the tip side (lower end side in the figure) of the closing-side iron piece lever 8 via an iron piece shaft 9a. A spring 17 is provided between the closing-side iron piece lever 8 and the iron piece 9, and the iron piece 9 is urged against the closing-side iron piece lever 8 in a direction in which the iron piece 9 comes into close contact with the iron core 3 b. The closing-side iron lever 8 is constantly urged clockwise by a spring 10 and has an engaging portion 8b that engages with a closing locking lever (not shown). The open iron lever 5 and the closed iron lever 8 are configured to be able to overlap as shown in FIG.

The pressure lever 11 is rotatable about a shaft 11a, and is constantly urged clockwise by a spring 12. One end side of crimp lever 11 (lower end side in the figure)
Is provided with a pin 11b, and the other end (upper end in the figure) has an engaging portion 11c that engages with the pin 13b of the set lever 13. In addition, it has a locking portion 11d locked by the engaging portion 15b of the release lever 15. The pin 11b is disposed so as to contact the contact portion 5c of the open-side iron lever 5 and the contact portion 8c of the closed-side iron lever 8, respectively. Each member other than the set lever 13 is provided on a second substrate 19 supported by a substrate 18 having a shutter opening. The set lever 13 is the shaft 1 on the substrate 18.
It is rotatable around 3a and is always urged counterclockwise by a spring 14. A pin 13c is arranged at an end of the set lever 13, and is engaged with a set member on the camera side. The release lever 15 is rotatable about a shaft 15a, and is urged clockwise by a spring 20. The end of the release lever 15 has an engaging portion 15c that engages with a reset member (not shown).

The setting operation of the setting mechanism having the above configuration will be described. In FIG. 1, first, the set lever 1
When the camera 3 is rotated clockwise by the camera-side set member engaging with the pin 13c against the urging force of the spring 14, the pin 13b of the set lever 13
1c, the pressure lever 11 rotates counterclockwise against the urging force of the spring 12. By this rotation, the pressure lever 1
The pin 11b installed at the end of the first iron lever 5
Of the open-side iron lever 5 against the urging force of the spring 10 in the clockwise direction against the urging force of the spring 10 by contacting the abutting portion 5c and the abutting portion 8c of the closing-side iron lever 8. Are rotated in the counterclockwise direction, respectively.

The iron piece 6 comes into contact with the iron core 1b by the rotation of the open-side iron piece lever 5. Similarly, the iron piece 9 comes into contact with the iron core 3b by the rotation of the closing-side iron piece lever 8. After the iron pieces 6 and 9 come into contact with the iron cores 1b and 3b, respectively, the pressure bonding lever 11
The opening side iron piece lever 5 and the closing side iron piece lever 8 are rotated in a direction for further rotating. At this time, the engaging portion 15b of the release lever 15 is engaged with the locking portion 11d of the pressure bonding lever 11, and the clockwise rotation of the pressure bonding lever 11 by the spring 12 is prevented. After performing the above operation, the set lever 13 follows the retreat of the set member on the camera side and returns to the initial position. Thus, a series of setting operations of the setting mechanism is completed, and a state shown in FIG. 2 is obtained.

When performing the exposure operation after the end of the setting operation, the release lever 15 is rotated counterclockwise in conjunction with the camera release operation. Then, the locking portion 15b of the release lever 15 is moved to the locking portion 11d of the pressure lever 11.
The pin 11b is separated from the contact portions 5c and 8c to release the pressure force on the iron pieces 6 and 9, and the iron pieces 6 and 9 It is held only by the attraction force of 1 and 3. Thereafter, when the power supply to the open-side electromagnet 1 is interrupted by a control circuit (not shown), the open-side iron lever 5 is rotated counterclockwise by the spring 7, and the engaging portion 5b is locked (not shown). The exposure is started by rotating the lever. After a lapse of a predetermined time,
When the energization of the closing-side electromagnet 3 is interrupted by the control circuit, the closing-side iron piece lever 8 is rotated clockwise by the spring 10, and the engaging portion 8b is rotated by the closing locking lever (not shown). Then, the exposure is completed and the state returns to the state shown in FIG.

[0013]

As described above, according to the setting mechanism of the present invention, the working radius of the iron piece is increased while the space is the same as the conventional one, so that the force for attracting and holding the iron piece by the electromagnet can be reduced. Electromagnets and iron pieces can be reliably attracted with a small amount of power consumption. In addition, when operating at the same voltage as in the prior art, it is possible to configure with a small electromagnet, and it is easy to configure a small shutter.

[Brief description of the drawings]

FIG. 1 is a plan view showing a state before setting of the embodiment is started.

FIG. 2 is a plan view showing the completion of setting in this embodiment.

FIG. 3 is a sectional view of a main part of the embodiment.

FIG. 4 is a plan view showing a state before setting of a conventional shutter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Opening-side electromagnet 3 Closing-side electromagnet 5 Opening-side iron piece lever 6, 9 Iron piece 8 Closing-side iron piece lever 11 Crimping lever

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-58-118628 (JP, A) JP-A-61-190532 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G03B 9/08-9/54

Claims (1)

(57) [Claims] An open-side iron lever rotatably supported to open and control a group of open blades for starting exposure, and a rotatable shaft for closing and controlling a group of closed blades to end exposure. A closed-side iron lever supported, an open-side electromagnet for controlling the attraction and release of the open-side iron lever, and a closing-side electromagnet for controlling the attraction and release of the closed-side iron lever; The closing-side electromagnet is located at a position between the position of the shaft and the position of the opening-side electromagnet, and the opening-side electromagnet is located at a position between the position of the support shaft of the closing-side iron strip lever and the position of the closing-side electromagnet. A shutter setting mechanism, which is provided.