JP2001350173A - Camera shutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive camera shutter where a chip type photocoupler and a flexible printed wiring board are mounted on a shutter base plate without soldering them. SOLUTION: The rectangular parallelopiped chip type photocoupler 7 is provided with a light emitting surface 7a and a light receiving surface 7b on the same plane and is further provided with four L-shaped electrode parts 7c extending over two other planes. As for the flexible printed wiring board 8, two belt-shaped parts 8a are formed so that the leading end parts face each other, and two electrode parts are respectively arranged at the leading end parts. As for the shutter base plate 1, a sensor storing chamber 1g is formed so that the insertion port may be positioned on a blade chamber side. The chip type photocoupler 7 and the flexible printed wiring board 8 are mounted on the shutter base plate 1 by making two belt parts 8a nearly equaly face the insertion port of the sensor storing chamber 1g, and then, press-inserting the chip type photocoupler 7 into the sensor storing chamber 1g by vending the two belt-shaped part 8a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera shutter provided with a chip type photocoupler for detecting the position of a shutter blade.

[0002]

2. Description of the Related Art Conventionally, there has been known a camera shutter in which a photocoupler having a light emitting portion and a light receiving portion detects the position of a shutter blade. And
There are various reasons for detecting the position of the shutter blade in accordance with the specifications of the camera. For example, some digital camera shutters have a shutter blade in which an exposure opening is fully opened before photographing and are closed at the end of photographing. Sometimes the shutter blades are not in the predetermined position,
If it covers the exposure opening a little,
An appropriate amount of exposure cannot be obtained. Therefore, especially in the case of an electric shutter, a photocoupler detects whether or not the shutter blade is at a predetermined position, and when the shutter blade is not at the predetermined position, the shutter blade is automatically returned to the predetermined position to perform photographing. It is known to do this.

[0003] In the case of a camera shutter using a film, at the start of photographing, the shutter blades
Detecting that a predetermined position immediately before the exposure opening is formed as a pinhole, and using the detection signal as a control start signal at the time of electric exposure, the exposure caused by individual differences in manufacturing. It is known to eliminate the variation in control, and it is also necessary to detect a position near the shutter blade where the exposure opening is fully opened, and to operate the flash device based on the detection signal. Is also known. The present invention provides
The present invention relates to a camera shutter to which a photocoupler is suitably mounted.

[0004]

By the way, among the photocouplers, there is a chip type photocoupler. Such a photocoupler does not have a long lead, so that such a photocoupler is used as a detecting means as described above. When mounting on a shutter base plate for use, if the chip-type photocoupler is fixed at a predetermined position first, when the flexible printed wiring board is soldered to it, the joint is shaded by the flexible printed wiring board. Work becomes extremely difficult. Therefore, when using such a chip type photocoupler, beforehand soldering to the flexible printed wiring board,
It will be attached to the shutter base plate.

[0005] However, if the flexible printed wiring board is attached to the shutter base plate after mounting in the flexible printed wiring board, the position of the photocoupler is determined because the flexible printed wiring board has flexibility as is well known. There is a problem that it becomes difficult to perform predetermined detection. Further, in the case where the photocoupler is mounted at a chip type photocoupler, since the photocoupler basically has no mechanical mounting portion, it is conceivable that the photocoupler is bonded to the shutter base plate. However, in such a case, there is a problem that the bonding operation is troublesome, the operation time is lengthened, and once attached, it is almost impossible to reattach. Further, it is conceivable to press-fit a photocoupler into a recess provided in the shutter base plate. However, if the photocoupler is not carefully pressed at that time, there is a possibility that the soldered portion may be broken. Furthermore, it is conceivable to provide a mounting portion on the photocoupler by special order and mount it with screws or the like, but in such a case, an additional mounting area is required or another component is required. This is disadvantageous in terms of space and cost.

The present invention has been made to solve such a problem, and an object of the present invention is to electrically connect a chip type photocoupler and a flexible printed wiring board without soldering them. It is an object of the present invention to provide a camera shutter particularly effective in reducing cost, in which a chip type photocoupler can be suitably attached to a predetermined position of a shutter base plate in a state where the shutters are electrically connected.

[0007]

In order to achieve the above object, a camera shutter according to the present invention comprises a synthetic resin shutter in which a sensor accommodating chamber is formed such that an insertion port is on the blade chamber side. An auxiliary base plate that constitutes the blade chamber between the main plate and the shutter base plate and the reflection unit is provided to face at least a part of the insertion port; and at least one sheet disposed in the blade chamber. A shutter blade, a flexible printed wiring board forming two strips with their tips facing each other, each tip of which is provided with two independent electrode parts; and It has four electrode parts which are individually brought into contact with the part, and is press-fitted from the insertion opening while bending the two band parts in a state where the surface on which the light emitting surface and the light receiving surface are arranged faces the auxiliary base plate side. Said Wherein the volume chamber is a flexible printed circuit board electrically connected to as and a chip type photo coupler detecting the position of the shutter blade.

According to another aspect of the present invention, there is provided a camera shutter according to the present invention, wherein a sensor accommodating chamber is formed such that an insertion port is on the opposite side of the blade chamber. A shutter bottom plate made of a synthetic resin having a window portion penetrating toward the chamber, and an auxiliary bottom plate constituting the blade chamber between the shutter bottom plate and reflecting means provided opposite the window portion And at least one shutter blade disposed in the blade chamber, and two bands formed so that the tips thereof face each other, and each of the tips has two independent electrode portions. A flexible printed wiring board provided with four electrode portions individually contacted with the respective electrode portions, and a surface where a light emitting surface and a light receiving surface are arranged is directed toward the auxiliary base plate side. The two strips A chip that press-fits from the insertion opening while bending and makes the light-emitting surface and the light-receiving surface face the window in the housing chamber and is electrically connected to the flexible printed wiring board to detect the position of the shutter blade. And a mold photocoupler.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to two illustrated embodiments. Note that the present invention can be applied to a shutter of a camera using a film, but both of these embodiments are applied to a shutter of a digital camera. FIG. 1 is a plan view of the first embodiment viewed from the subject side when assembled in a camera, and shows a closed state immediately after photographing is completed. FIG. 2 is a cross-sectional view taken along line AA of FIG. 1. In FIG. 2, the subject is on the upper side. Furthermore,
FIG. 3 is a cross-sectional view of the second embodiment cut and shown in the same manner as FIG.

First, the configuration of the first embodiment shown in FIGS. 1 and 2 will be described. The shutter base plate 1 and the auxiliary base plate 2
Both are made of synthetic resin, and constitute a blade chamber between them. The shutter base plate 1 has a substantially circular opening 1a at a substantially central portion thereof. Also,
Although the auxiliary base plate 2 is not shown in its entire shape, it actually has substantially the same planar shape as the shutter base plate 1, and an opening having the same shape as the opening 1a is formed substantially in the center thereof. I have. By arranging the two openings concentrically, an exposure opening is formed. Also,
The auxiliary base plate 2 is screwed to three mounting portions 1b provided on the shutter base plate 1 with three screws 3, but FIG. 1 shows only one of the screws.

On the back side of the shutter base plate 1, that is, on the image pickup device side, a current control type motor which has been called an iris motor in the past but has recently been called a moving magnet type motor is attached. Have been. However, the configuration and function of such a motor are disclosed in
Since it is well known in, for example, Japanese Patent No. 6267, illustration of a specific configuration is omitted, and FIG. 1 shows only the rotor 4 which is magnetized into two poles. The rotor 4 has a drive pin 4a at a portion protruding in the radial direction so as to be parallel to a rotation axis of the rotor 4 (disposed concentrically with a shaft 1e described later). The drive pin 4a is formed in an arc-shaped long hole 1 formed in the shutter base plate 1.
c, and its tip protrudes into the blade chamber.

Next, the configuration inside the blade chamber will be described. The shutter base plate 1 has an annular portion 1d surrounding the opening 1a.
Are formed. The annular portion 1d is formed thicker than the reference surface 1i on the blade chamber side. The shutter base plate 1 is provided with two shafts 1e and 1f, on which shutter blades 5 and 6 are rotatably mounted. Each of the shutter blades 5 and 6 has a well-known long hole, and the drive pin 4a is fitted into the two long holes. Accordingly, the shutter blades 5, 6 are arranged between the annular surface of the annular portion 1d and the auxiliary base plate 2 in accordance with the rotation direction of the rotor 4,
It can be rotated in the direction opposite to the opponent's wing.

A commercially available chip type photocoupler 7 is attached to the shutter base plate 1. The chip-type photocoupler 7 has a rectangular parallelepiped shape, in which a light-emitting surface 7a and a light-receiving surface 7b are arranged on one surface, and four L-shaped members are arranged across the other two surfaces. It has an electrode part 7c. Further, a flexible printed wiring board 8 is mounted on the shutter base plate 1 together with the photocoupler 7. This printed wiring board 8
, Two strips 8a are formed so that their tips face each other, and at their tips,
Two independent electrode units (not shown) are provided.

The chip type photocoupler 7 and the flexible printed wiring board 8 are
The two band portions 8a are attached in a state where they are accommodated in a sensor accommodation room 1g formed in the shutter base plate 1. That is, as for the mounting method, first, the two band portions 8a face the insertion opening of the sensor accommodating chamber 1g substantially uniformly. Then, the chip type photocoupler 7 is press-fitted from the insertion port while bending the two band portions 8a toward the auxiliary base plate 2 with the light emitting surface 7a and the light receiving surface 7b arranged in the arrangement as shown in FIG. ing. Therefore, the chip type photocoupler 7 and the flexible printed wiring board 8 are connected to each other in a state where the four electrode portions are not joined by solder.
g, and are electrically connected. A reflection sheet 9 is attached to the auxiliary base plate 2 at a position facing the above-mentioned insertion opening.

Next, the operation of the first embodiment having such a configuration will be described. The shutter according to the present embodiment is a shutter for a digital camera generally called a normally open type. For this reason, the shutter blades 5 and 6 do not cover the entire surface of the image sensor except in a state immediately after the end of shooting. FIG. 1 shows a state immediately after the end of the photographing. In this state, the photographed image signal is transferred to the storage device. Further, in this state, light emitted from the light emitting surface 7a of the photocoupler 7 is reflected by the reflection sheet 9 of the auxiliary base plate 2, and is incident on the light receiving surface 7b. Therefore, the signal output from the photocoupler 7 is H (HIG
H) It is a signal.

In this state, when the transfer of the image signal is completed, the rotator 4 is rotated clockwise. for that reason,
The shutter blades 5, 6 are rotated in opposite directions by the drive pin 4a, and open the opening 1a. Immediately after the shutter blades 5, 6 fully open the opening 1a, the drive pin 4a contacts the lower end of the elongated hole 1c, and the rotation of the rotor 4 is stopped. In this state, since the shutter blade 6 completely covers the light receiving surface 7b of the photocoupler 7, an L (LOW) signal is output from the photocoupler 7, and the opening 1a is completely opened. Is confirmed. In this fully opened state, the image of the subject can be observed on the monitor.

By the way, in this state, if the motor is continuously energized, there is a problem in terms of power consumption. Therefore, in the case of the present embodiment, the current supply to the motor is cut off. In this case, as is well known, the rotor 4 is provided with a clockwise rotating force by a magnetic attraction force acting between the rotor 4 and a magnetic member provided on the stator side, and the rotor 4 is fully opened. The state is maintained. In addition, such a fully open state turns off the power,
The same holds when the camera is not used.

However, even if such a configuration is employed, it cannot be said that the shutter blades 5 and 6 are not deviated from proper positions due to an unexpected force acting. Then, when such a situation occurs, the shutter blades 5 and 6 move the opening 1a during the photographing when performing the next photographing.
Since the operation is started from a position closer to the closing position than the proper position at the end of the photographing at the end of photographing, photographing with an appropriate exposure amount cannot be performed. However, in the case of this embodiment, even if such a situation occurs,
Shooting can be performed with an appropriate exposure. That is, in the present embodiment, when the power is on and the shutter blades 5 and 6 are not at the proper positions, the H signal is output from the photocoupler 7 and the rotor 4 is output until the L signal is output.
Is rotated clockwise.

In this state, when the next photographing is performed, first, a photographing start signal is supplied to an image pickup device such as a CCD. Next, when a predetermined shooting time has elapsed,
The closing signal of the shutter blades 5 and 6 is issued from the control circuit, and the rotor 4 starts rotating counterclockwise. Thereby, the shutter blades 5, 6 are rotated in opposite directions by the drive pin 4a, and close the opening 1a. Then, the rotation of the rotor 4 is stopped by the drive pin 4a abutting on the upper end of the long hole 1c, and the image signal of the subject is transferred to the storage device in the state of FIG.

Next, a second embodiment of the present invention will be described with reference to FIG. 3. The configuration of the second embodiment is different only in the mounting configuration of the photocoupler 7. Therefore, substantially the same members and portions as those in the first embodiment are denoted by the same reference numerals, and only differences from the first embodiment will be described. First, the shutter base plate 1 of this embodiment is not provided with the annular portion 1d of the first embodiment. Further, the sensor housing chamber 1g formed in the shutter base plate 1 is formed such that the insertion opening is on the opposite side to the blade chamber side.
A window 1h penetrating toward the blade chamber is formed in the sensor accommodating chamber 1g, and a reflection sheet 9 is attached to the auxiliary base plate 2 on a surface facing the window 1h.

In the present embodiment, the chip type photocoupler 7 and the flexible printed wiring board 8 are attached by first inserting the two band portions 8a of the flexible printed wiring board 8 into the insertion openings of the sensor accommodating chamber 1g. Then, the chip type photocoupler 7 is moved to the light emitting surface 7 thereof.
a and the light receiving surface 7b are directed toward the auxiliary base plate 2 so that the two band portions 8a are press-fitted from the insertion port while being bent. Then, in the state after the attachment, the chip type photocoupler 7 and the flexible printed wiring board 8
It is fixed in the sensor accommodating chamber 1g, and the four electrode parts are electrically connected even if they are not joined by solder, so that the light emitting surface 7a and the light receiving surface 7b face the window 1h. ing.

The operation of the second embodiment is similar to that of the first embodiment.
Since the operation is performed in exactly the same manner as in the embodiment, the description thereof will be omitted. Also, in the above two embodiments,
Although the case where two shutter blades are provided has been described,
In the present invention, one or three or more sheets may be used. Also, in the above two embodiments,
Although the reflection sheet is attached to the auxiliary base plate, the reflection surface may be formed by plating or painting.

Furthermore, the above two embodiments illustrate the present invention.
Both are applied to a shutter for a digital camera, but as described above, a chip type photocoupler is also used as a sensor for detecting the position of a shutter blade in a shutter for a camera using a film. Needless to say, the present invention can be applied to such a camera shutter.

[0024]

As described above, according to the present invention, a chip type photocoupler and a flexible printed wiring board can be mounted at a predetermined position on a shutter base plate by a simple mounting operation without soldering. This is advantageous for cost reduction.

[Brief description of the drawings]

FIG. 1 is a plan view of a first embodiment viewed from a subject when assembled in a camera, showing a closed state immediately after photographing is completed.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view of the second embodiment cut and shown in the same manner as in FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shutter base plate 1a Opening 1b Attachment part 1c Slot 1d Annular part 1e, 1f Shaft 1g Sensor accommodation room 1h Window 1i 2 Auxiliary base plate 3 Screw 4 Rotor 4a Drive pin 5, 6 Shutter blade 7 Photocoupler 7a Light emitting surface 7b Light receiving surface 7c Electrode section 8 Flexible printed wiring board 8a Band section 9 Reflecting sheet

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[Procedure amendment]

[Submission date] June 15, 2000 (2006.1.
5)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Explanation of sign

[Correction method] Change

[Correction contents]

[Description of Signs] 1 Shutter base plate 1a Opening 1b Attachment 1c Slot 1d Ring 1e, 1f Shaft 1g Sensor housing 1h Window 1i Reference surface 2 Auxiliary base plate 3 Screw 4 Rotor 4a Drive pin 5, 6 Shutter blade Reference Signs List 7 photocoupler 7a light emitting surface 7b light receiving surface 7c electrode section 8 flexible printed wiring board 8a band section 9 reflection sheet

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) // H04N 101: 00 H04N 101: 00

Claims (2)

[Claims] 1. A synthetic resin shutter base plate having a sensor housing chamber with an insertion port on the blade chamber side,
An auxiliary base plate which constitutes the blade chamber between the shutter base plate and reflection means provided to face at least a part of the insertion opening; and at least one shutter blade arranged in the blade chamber. A flexible printed wiring board in which two end portions are formed so as to face each other and two end portions are provided at the end portions, respectively, and each of the electrode portions is individually provided. The two chambers are pressed in from the insertion opening while bending the two band portions in a state in which the surface on which the light-emitting surface and the light-receiving surface are arranged faces the auxiliary base plate side. And a chip-type photocoupler electrically connected to the flexible printed circuit board to detect the position of the shutter blade. 2. A synthetic resin housing in which a sensor housing chamber is formed so that an insertion port is opposite to the blade chamber, and a window portion penetrating toward the blade chamber is formed in the sensor housing chamber. An auxiliary base plate that constitutes the blade chamber between the shutter base plate and the shutter base plate and that includes a reflection unit facing the window, and at least one shutter blade that is disposed in the blade chamber; A flexible printed wiring board in which two end portions are formed so as to face each other and two end portions are provided at the end portions, respectively, and each of the electrode portions is individually provided. The two chambers are pressed in from the insertion opening while bending the two band portions in a state in which the surface on which the light-emitting surface and the light-receiving surface are arranged faces the auxiliary base plate side. In the above A camera comprising: a chip-type photocoupler having a light-emitting surface and the light-receiving surface facing the window and being electrically connected to the flexible printed wiring board to detect a position of the shutter blade. Shutter.