JPH08665Y2 - Shutter drive device for automatic focusing camera - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Use of the Invention] The present invention relates to a shutter driving device in a camera having an automatic focusing mechanism.

[Prior Art and Problems] Recently, the market demand has made the camera smaller, but at the same time, it is required to have an automatic focus adjustment mechanism, which makes the structure complicated. Also, there were many difficult points in terms of space.

Under such circumstances, Japanese Patent Publication No. Sho 63-15568 proposes a technique in which a forward-moving member performs a follow-up operation of a focus adjusting member and a driving of an exposure blade.

However, by moving in one direction by a single member called the forward running member, the two members are operated in sequence, so the moving area must be lengthened, and because it slides at high speed, It was likely to cause agitation.

Further, since the delay device is directly linked to the front running member, there are some restrictions due to the structure of the driving device.

[Object of the Invention] In view of the above-mentioned disadvantages, an object of the present invention is to provide a shutter drive device which is advantageous in terms of space without complicating the structure and being restricted by the arrangement of the opening / closing member and the delay device. To provide.

[Constitution of the Invention] The above-mentioned object constitutes a part of the delay device for delaying the forward running member, and the opening / closing member is locked at the time of setting, and when it is swung, the projection part opens the shutter blade to the opening / closing member. This is achieved by allowing the front running member to act on the opening / closing member via the swinging member for performing the above-mentioned operation.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a plan view of a shutter drive mechanism of a shutter drive device according to the present invention, showing a state before the shutter charge.

FIG. 2 also shows the state of the shutter charge.

FIG. 3 is a plan view of the automatic focusing mechanism of the shutter drive device, showing a state before the shutter charge.

FIG. 4 also shows the state of the shutter charge.

 Reference numeral 1 is a shutter substrate.

An electromagnet device 2 is composed of a frame, an iron core, and a winding, and is fixed on the shutter substrate 1.

Reference numeral 3 denotes an iron piece, which is swingably supported by the iron piece retainer 4 on the electromagnet device, and is attracted / separated as the electromagnet device 2 is excited / demagnetized.

Reference numeral 5 denotes an iron piece lever, which has a locking arm 5a protruding from the back side of the paper surface, a step portion 5b is formed at one end, and the iron piece 3 is loosely fitted to the shaft 5 provided on the shutter substrate 1.
It is rotatably supported by 5c and is urged in the counterclockwise direction by a spring 5d so that it rotates with the swing of the iron piece 3.

6 is a forward running member, which is a long groove and axes A, B with the shutter substrate 1.
It is supported in relation to and can slide to the left and right, and has two pins 6a and 6b on the front surface and two pins 6c on the back surface.
6d is planted and is urged rightward in the drawing by a spring 6g.

The forward running member 6 is arranged to be locked by a locking lever (not shown) at the substantially leftmost position in the shutter charge state shown in FIG. 2, and the locking lever is the electromagnet device 2 described above. It is configured to release the locking of the forward running member by exciting.

Reference numeral 7 denotes a swinging member, which is rotatably supported by a shaft 7a provided on the shutter substrate, and which engages with a delay device 8 and an arm 7b which engages with a pin 6c set up on the forward running member 6. Gear part
7c and a cam-shaped protrusion on the top surface that is roughly "V" shaped
It has 7d and rotates with the slide of the forward running member.

Reference numeral 9 denotes an opening / closing member, which is rotatably supported by a shaft 9a provided on the shutter substrate 1, is biased counterclockwise by a spring 9b, and extends the arm in three directions by the shaft 9a. Pin 9c connected with shatter blade
And the cam-like protrusion 7d of the swing member.
The second arm with pin 9d that follows the outside of the
It has a third arm planted with 9e.

Reference numeral 10 denotes a closing member, which is independently rotatably supported on the same shaft 9a as the opening / closing member, is urged clockwise by a spring 10a, and contacts the pin 6c of the forward running member 6. The pushed portion 10b, the pin 10c locked by the locking arm 5a of the iron piece lever 5 and the third arm of the opening / closing member 9 when the iron piece is in the attracted state during the left rotation. It has a contact portion 10d for contacting the pin 9e planted in.

 As described above, the shutter drive mechanism is configured.

Reference numeral 11 denotes a fan-shaped gear, which is rotatably supported on the back surface of the shutter base plate 1 independently of the shaft A, and which is brought into contact with the pin 6b when the forward running member 6 is moved leftward. Part 11b
And has a gear portion 11c and is urged clockwise by a spring 11d.

Reference numerals 12 and 13 denote holding electromagnets, which are fixed to the back surface of the shutter substrate 1 and selectively excited / demagnetized by a signal output from a known focus detection circuit (not shown).

Reference numeral 14 denotes a focus adjusting member, which has a tooth portion 14a that meshes with the gear portion 11c of the fan-shaped gear, and a locked projection portion 14b, and is configured to extend the photographing lens by rotating clockwise. .

Reference numerals 15, 16 and 17 denote holding members, which are independently and rotatably supported by shafts C provided on the back surface of the shutter substrate 1, and selectively excite the holding electromagnets 12 and 13, that is, 2 Excitation-excitation, excitation-de-excitation of the two holding electromagnets 12, 13
By the four combinations of non-excitation-excitation and non-excitation-non-excitation, the engaging portions 15a, 16a, 17a of the three holding electromagnets are brought into the positions where the engaging projections 14b of the focus adjusting member 14 are engaged. It is configured to selectively rotate.

Reference numeral 18 is a presser lever, which is provided on the rear surface of the shutter substrate 1 with the shaft B
Is independently and rotatably supported by the forward running member 6
To move to the left, the contacted portion 18b that contacts the pin 6a and the three holding members 15, 16 and 17 are both rotated to the locking position. Member 15,
It has a holding plate 19 for pushing the ends of 16 and 17, and is biased clockwise by a spring 18c.

As described above, the automatic focus adjustment mechanism in this embodiment is configured.

 The operation of this embodiment will be described below.

First, when the shutter is charged from the initial state of FIG. 1, when the forward running member 6 slides leftward against the spring 6g, the pin 6c pushes the arm 7b of the swinging member 7, The swinging member 7 rotates counterclockwise.
Here, since the gear portion 7c of the swinging member 7 meshes with the delay device 8, the forward running member 6 travels while being braked by the delay device 8.

Further, as the forward running member 6 moves to the left, the pin 6c pushes the pushed portion 10b of the closing member 10, and the closing member 1
Rotate 0 counterclockwise.

By the counterclockwise rotation of the closing member 10, the pin 9e of the opening / closing member 9 follows the contact portion 10d of the closing member 10 and the opening / closing member 9 rotates counterclockwise by the bias of the spring 9b. However, when the pin 9d comes into contact with the cam-shaped protrusion 7d of the swing member 7, the rotation is stopped.

Further, the pin 6b of the forward running member 6 pushes the pushed portion 11b of the sector gear 11 to rotate it counterclockwise. By this rotation, the focus adjusting member rotates clockwise, and the lens is moved to the extended position.

Further, the pin 6a of the forward running member 6 pushes the contacted portion 18b of the presser lever 18 to rotate the presser lever 18 counterclockwise. As a result, the holding plate 19 rotates the holding members 15, 16 and 17 and hoists it to the holding position.

From this position, the forward running member further slides and is locked by a locking lever (not shown) to be in the state shown in FIG. 2, and the charging of the shutter is completed.

When the shutter is released in this state, the focus detection circuit is activated by a known method (not shown) to selectively excite the two holding electromagnets 12 and 13.

Further, the electromagnet device 2 is excited, and the iron piece lever 5 rotates to attract (clockwise).

Here, the locking arm 5a of the iron piece lever 5 locks the pin 10c of the closing member 10.

Further, the forward running member 6 is released from the locking by a locking lever (not shown) and starts to move to the right by the biasing of the spring 6g.

First, in the first half of traveling, the holding lever 18 rotates clockwise following the movement of the pin 6a of the forward running member 6 to the right, whereby the holding member not attracted by the holding electromagnets 12 and 13. Follows the iron piece retainer 19 and is rotated to the initial position by the biasing force of the spring to move the focus adjusting member 14
The locking position of the detention holding member is determined.

After that, the sector gear 11 rotates clockwise following the rightward movement of the pin 6b of the forward drive member 6, whereby the locked projection 14b is locked by the locking portion of the focus adjusting member. It rotates to the position where it is stopped, and the taking lens is secured in the in-focus position.

Along with the above-mentioned operation, the swing member 7 is a pin of the forward running member 6.
Following the movement of 6c to the right, it rotates clockwise.

When the forward running member 6 slides further to the right, the opening / closing member 9 that was in contact with the surface a of the cam-shaped protrusion 7d of the swing member 7 is moved to the surface b of the cam-shaped protrusion 7d. Then, the opening / closing member 9 is gradually rotated counterclockwise by the urging force of the spring 9b, and the pin 9c set on the first arm 9c.
Open the blade connected to.

After that, the electromagnet device 2 is de-energized and deenergized by the known exposure control circuit, so that the iron piece lever 5 rotates in the initial position direction (counterclockwise direction).

As a result, the closing member 10 is unlocked by the locking arm 5a, the closing member 10 rotates clockwise, and the abutment portion 10d pushes the pin 9e of the opening / closing member 9 to rotate clockwise to move the blade. Close.

[Advantages of the Invention] As described above, the forward traveling member that slides and the swing member that swings as the forward traveling member slides are provided, and the swing member brakes the opening / closing member, and further the delay device. Since the opening / closing member is not restricted to the moving area of the forward running member by being connected with the moving member, the position of the delay device is restricted to the moving area of the forward running member by the rocking member having the gear portion. The movement locus of the opening / closing member is small, and the slant is kept small compared to sliding / following a long running member that slides at high speed, and the locking lever is released due to an external impact. Even if the running member has run, the closing member prevents the opening / closing member from trying to operate unless the electromagnet device is excited, so that various effects are obtained in that the blade is not accidentally opened. it can.

[Brief description of drawings]

FIG. 1 is a plan view of a shutter drive mechanism of a shutter drive device according to an embodiment of the present invention, showing a state before a shutter charge, and FIG. 2 is a plan view of the shutter drive mechanism showing a shutter charge state. FIG. 3 is a plan view of the same automatic focus adjusting mechanism according to the present invention, showing a state before the shutter charge, and FIG. 4 is a plan view showing a part of the automatic focus adjusting mechanism in the same manner. Shows. 1 ... Shutter substrate, 2 ... Electromagnet device, 5 ... Iron lever, 5a ... System stop arm, 6 ... Forward running member, 7 ... Oscillating member, 7c ... Gear part, 7d ... Cam shape Protrusion, 8 ... Delay device, 9 ... Closing member, 10 ... Closing member, 10d ... Contact portion, 11 ... Fan gear, 12/13 ... Holding electromagnet, 14 ... Focus adjusting member, 15・ 16 ・ 17 …… Holding member, 18 …… Holder lever

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical indication G03B 13/36

Claims (1)

[Scope of utility model registration request] 1. An automatic focus control camera in which a photographing lens is positioned at a focus position by a signal output from a focus control circuit, and then a shutter blade is opened and closed to perform exposure. The electromagnet that is controlled to the state, the forward running member that is unlocked by the excitation of the electromagnet and that runs, and is pivotally supported so that one side engages with a part of the forward running member. A rocking member having a gear portion and a cam-like protrusion that mesh with the delay device, and an arm extending in three directions from a fulcrum to open and close the shutter blades. To close the first arm that has been planted, the second arm that has been planted with a pin that operates the shutter blade so that the shutter blade can be opened by following the cam-shaped protrusion of the swinging member, and to close the shutter blade. Closed to operate An opening / closing member including a third arm that is pushed by a chain member; a focus adjusting member that drives the taking lens; and a holding member that holds the focus adjusting member at a focus position, A shutter driving device for an automatic focusing camera, wherein a front-running member follows the focus adjusting member to a focus position in the first half of running, and then rocks the rocking member to perform exposure.