JPH0915721A - Holding structure for information detecting element incorporated in camera - Google Patents

Abstract

PURPOSE: To provide holding structure for the information detecting element of a camera capable of reducing the number of parts and assembly work stages by holding the information detecting element detecting the presence or absence of film or counting the perforation of film by a pressing plate holding the light shielding plate of the camera in a camera main body which changes photographic image plane size by turning the light shielding plate supported in front of an aperture in the camera main body. CONSTITUTION: A detection hole 10e is formed to face to the perforation 71 of the film 70 at a part of the camera main body 10, and wall bodies 10g and 10h are protrusively provided at its front side periphery so as to form a holder part 29. A film detecting element 26 is housed in the holder part 29 and the holder part 29 is covered with a molt pad 27 for shielding light, and the pressing plate 28 holding the light shielding plate in the camera main body 10 is stuck and fixed on the camera main body 10. A cover part 28c is formed at the part of the pressing plate 28 and opposed to the film detecting element 26, whereby the film detecting element 26 and the molt pad 27 are held by the cover part 28c.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION This invention is incorporated in a camera,
In particular, the present invention relates to a holding structure for a detection element that detects information about a film such as the presence or absence of a film, the number of shots, or the number of remaining films.

[0002]

2. Description of the Related Art In recent years, an automatic exposure device, an automatic film feeding device, an automatic focusing device, a variable focus lens device, a low-brightness automatic light emission strobe device, or a part of the film is horizontally shielded to provide exposure. By installing a panoramic image capturing device, etc., anyone can easily enjoy taking pictures, and cameras equipped with such devices have been remarkably popular. In this type of popular camera,
Since 35 mm size roll film is generally used, it is necessary to inform the photographer of the number of film shots or the number of remaining films. If the photographer is not aware of the number of shots, etc., the roll film is used because the camera without a film loaded or the camera with a film without a remaining number of shots may be used for shooting. Some cameras are equipped with a device that detects and displays the presence or absence of film and the number of shots.

Previously, the information on the film was detected by the sprocket having teeth engaging with the perforation of the film, and the rotation and the number of rotations of the sprocket due to the running of the film. However, as described above, since the camera is equipped with the automatic exposure device and various other devices and the CPU for controlling these devices is installed, the optical information using infrared light or the like for detecting the film information is used. Detection elements such as elements have come to be used.

FIG. 10 is a sectional view showing the holding structure of the detecting element 1. A detection hole 2a is formed in a portion of the camera body 2 that faces the perforation 3a of the traveling film 3. On the front surface of the camera body 2 and at the edge of the detection hole 2a, a holder 2c is formed by a wall 2b that is provided so as to surround the detection hole 2a, and the detection element 1 is attached to the holder 2c. The detector is housed with the detection portion facing the detection hole 2a. The detection element 1 is connected to a predetermined terminal of a printed board on which a CPU (not shown) and the like are incorporated by a lead wire 1a. The detection terminal 1 is covered with a malt pad 4 and further with a holding lid 5. A set screw 6 is passed through the holding lid 5 and is fastened to a seat portion 2d formed on the front surface of the camera body 2 to fix the holding lid 5 to the camera body 2.

[0005]

However, the above-mentioned conventional holding structure for the information detecting element has the following problems. As described above, recent popular cameras are equipped with so-called panoramic image capturing devices. As a mechanism of this device, light shielding plates that are rotatable about the traveling direction of the film as an axis are provided at the upper and lower edges of the aperture. When shooting in panorama size, this shading plate shields the upper and lower parts of the aperture from light to prevent the upper and lower parts of the film from being exposed. There is one in which exposure is applied to the entire area. In this mechanism, since the light shield plate is arranged on the front side of the aperture, the light shield plate is incorporated from the front of the camera body, and the holding member that covers the rotating shaft is attached to the camera body so that the light shield plate does not fall off. It is fixed to. In a camera provided with a shading plate by such a mechanism, the holding member of the shading plate is fixed,
The information detecting element is separately held by the holding lid 5. Therefore, the holding member for the light shielding plate and the holding lid 5
Therefore, the number of parts is increased and the number of assembly work steps is increased.

Therefore, the present invention provides a holding structure for an information detecting element incorporated in a camera, which has a simple structure without increasing the number of parts and therefore requiring the assembling work of the parts. Is intended.

[0007]

As a technical means for achieving the above object, a holding structure of an information detecting element incorporated in a camera according to the present invention has a shaft extending along an edge of a pair of facing apertures. In a camera with a shooting screen size switching device that changes the shooting screen size by revolving the light shielding plate rotatably supported around the center of the aperture, the pair of the above A light-shielding plate, an information detecting element which is incorporated from the front of the camera body, and detects information provided on the film loaded in the camera by exposing it to an appropriate portion, and the light-shielding plate and the information detecting element And a holding plate having a portion for holding the light-shielding plate and the information detecting element arranged on a predetermined portion of the camera body. It is characterized in that to hold the these shielding plate and the information detection device in the camera body by fixing the.

The information detecting element is suitable for the case where the information detected by the information detecting element is the information on the presence or absence of the film or the information such as the number of shots or the number of remaining sheets by counting the perforations of the film. It is characterized by being an optical electric element arranged so as to face the perforation of the film.

The information detected by the information detecting element is recorded in the magnetic recording band in the case of a film having a magnetic recording band formed on the edge, in addition to the number of filmed images. There are information such as the shooting date and exposure information at the time of shooting. When the information detected by the information detecting element is this kind of magnetic information, a magnetic head or the like is used as the information detecting element.

[0010]

In order to incorporate the information detecting element into the camera body, the information detecting element is arranged in a predetermined recess or holder formed on the front surface of the camera body, and the light shielding plate is arranged in the predetermined holding portion. To do. Then, the pressing plate is fixed and fixed to the camera body with a set screw or the like while matching predetermined portions with the information detecting element and the light shielding plate. The light shielding plate is rotatably supported by the camera body and the pressing plate, and is linked to a predetermined driving mechanism so that it can receive a driving force for rotation. The information detecting element faces the appropriate portion of the film on which the detecting portion is loaded, and is in a state where the information on the film can be obtained.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A holding structure for an information detecting element incorporated in a camera according to the present invention will be described below based on the illustrated embodiment.
A detailed description will be given together with a camera structure suitable for providing this holding structure.

FIG. 6, FIG. 8 and FIG. 9 show the state in which the shading plate is located at the panorama size position, and FIG. 7 shows the state in which the shading plate is located at the normal size position. FIG.
5 to 5 are exploded perspective views of a camera body 10 of a camera equipped with this drive mechanism. As shown in FIGS. 9 and 3, at the rear of the camera body 10, a switching knob 11 that is operated when switching the shooting screen size between the normal size and the panorama size is slidable in the width direction of the camera body 10. Knob support hole for holding the camera body 10 with the width direction as the longitudinal direction
10a is formed. The switching knob 11 is formed with knurled eyes or the like on the rear surface so that the photographer can easily put his / her finger or the like, and a substantially prismatic knob support portion 11a is provided on the front surface so as to project forward. Further, on the front surface of the switching knob 11, a contact piece 11b whose contact point of a circuit formed on the flexible printed circuit board 12 is changed by sliding of the switching knob 11 is provided.
Is attached. The flexible printed circuit board 12 is attached to an appropriate position on the camera body 10 with a double-sided adhesive tape 12a. The switching knob 11 is the knob support portion.
The driving plate 11a is supported by the camera body 10 by inserting the knob support hole 10a into the knob support hole 10a, and the set screw 14 is attached to the tip end of the knob support portion 11a inserted into the knob support hole 10a.
13 is attached.

As shown in FIGS. 3 and 9, the switching drive plate 13 has the longitudinal direction in the width direction of the camera body 10, and the set screw 14 is provided at the base end fixed to the knob support 11a.
Is formed with a screw hole 13a, and a free end portion is formed with a fork portion 13b for driving a finder light shielding plate described later. Further, a rotary plate drive pin portion 13c which is directed forward is formed at a lower portion of the base end portion so as to project.

On the side of the aperture opening 10b formed in the rear portion of the camera body 10, there is provided a rotary plate 15 having a substantially L shape incorporated from the front of the camera body 10 at the bent portion of the L shape. The camera body 10 is rotatably supported about the axis 15c in the depth direction. As shown in FIG.
Further, as shown in FIG. 9, a fork portion 15a is formed, and the rotating plate drive pin portion 13c is loosely inserted in the fork portion 15a. A switching plate drive pin portion 15b is provided on the other end of the rotating plate 15 so as to be directed rearward. The rotating plate 15 is provided with a light shielding portion 15d so that light incident from above does not reach the aperture opening 10b.

As shown in FIGS. 3 and 6 to 9, the aperture 10b for the aperture of the camera body 10 is laterally slid in the height direction of the camera body 10, that is, in the direction intersecting the upper and lower edges of the aperture. A switching plate 16 is supported movably so that the longitudinal direction is the height direction of the camera body 10. As shown in FIG. 9, a fork portion 16f formed on the upper portion of the switching plate 16
And the switching plate drive pin 15b are engaged with each other, and the rotation plate 15
The switching plate 16 slides in the height direction of the camera body 10 by rotating. Further, as shown in FIGS. 6 to 9, an input pin portion 16a is formed on the upper portion of the switching plate 16 so as to project toward the front. An input plate portion 16b formed by bending a side portion of the switching plate 16 so as to be directed forward is provided on the lower portion of the switching plate 16. This input board section 16
The lower side surface of b is an inclined surface 16c which is inclined in the depth direction of the camera body 10 as shown in FIGS.

As shown in FIG. 3, a lens barrel 17 is attached to the front of the camera body 10 from the front. The lower drive plate 18 is supported by the width direction of the camera body 10 as an axis at a position where the lower portion of the switching plate 16 faces the side of the lens barrel 17 and is attached to the camera body 10. It is rotatably supported by the pin 18a. At the front end of the lower drive plate 18, as shown in FIGS. 6 to 9, there is a lower drive pin portion 18b of the camera body 10 which is engaged with and disengaged from the inclined surface 16c by the rotation of the lower drive plate 18. The lower input portion 18c is formed at the rear end portion so as to project laterally.

Light-shielding plates 21 and 22 for switching the photographing screen size
Is the camera body 10 as shown in FIGS. 3 and 6 to 9.
The aperture for the aperture is rotatable around the width direction of the
Each of the upper and lower edges of 10b is supported on the front side of the camera body 10. These shading plates 21 and 22 are the camera body
The bearing pin portions 21a and 22a project in the longitudinal direction of the light shielding plates 21 and 22 at both upper end portions of the upper light shielding plate 21 and lower end portions of the lower light shielding plate 22, respectively. Bearing pin portion 21a on the side where the switching plate 16 is disposed,
Input shaft portions 21b 1 and 22b 2 are provided on the 22a 2 at positions deviated from the bearing pin portions 21a 1 and 22a 2. In addition, the switching plate 16
As shown in FIGS. 3 and 9, the bearing pin portions 21a and 22a on the side where the
21c and 22c are wound, and the restoring force of the return springs 21c and 22c is biased to the light shielding plates 21 and 22 so that the light shielding plates 21 and 22 in the panoramic size position can rotate to the normal size position. .

As shown in FIG. 3, the date optical system 23 of the photographing information imprinting device is assembled from the rear of the camera body 10. The date optical system 23 is provided with a plurality of emitting units corresponding to the size of the shooting screen. The date optical system 23 is on the front surface of the camera body 10 and has the aperture opening 10b.
It is accommodated in and attached to the cover member 24 on the side of.
An injection position switching plate 25 is interposed between the date optical system 23 and the cover member 24, and a lower end portion of the injection position switching plate 25 is bent to form a locking portion 25a. Stop 25
As shown in FIGS. 7 and 8, a is engaged with the drive groove 16d formed in the switching plate 16. Further, as shown in FIG. 9, a through hole portion 25b is formed in the injection position switching plate 25, and the through hole portion 25b is formed at a position facing the emitting portion of the date optical system 23. Moreover, the through hole portion 25b is formed at a position where only one emission portion of the date optical system 23 is opened and the other emission portions are shielded by the movement of the emission position switching plate 25. Therefore, the ejection position switching plate 25 slides as the switching plate 16 slides, and the ejection position of the date optical system 23 can be switched to a position corresponding to the size of the photographing screen.

Further, at the front of the camera body 10, as shown in FIGS. 1 to 3, a photo reflector for electrically detecting the film 70 and counting the perforations 71 to detect the number of film frames. A film detection element 26 as an information detection element including an optical electric element such as a photo interrupter or the like is attached so as to face a detection hole 10e formed in the camera body 10. The detection hole 10e is a portion where the film 70 loaded in the camera travels, and is formed in a portion of the film 70 facing the perforation 71. The detection hole 10e is an edge portion of the detection hole 10e and is formed in the camera body 10. On the front side, as shown in FIG. 1 and FIG.
10 g and 10 h are projected, and the upper side wall 10 h is higher than the wall body 10 g of other parts. A holder part for accommodating the film detection element 26 in the part surrounded by the walls 10g and 10h.
29 is formed, and further, a spot facing portion 29a is formed by recessing the peripheral portion of the detection hole 10e in a shape substantially equal to the outer shape of the film detection element 26. The film detecting element 26 is accommodated in the holder portion 29 with the tip end portion accommodated in the spot facing portion 29a, and the detecting portion is directed to the perforation 71 of the film 70. The film detection element 26 has a terminal 26a
Is provided, and this terminal 26a and a predetermined terminal on a circuit board (not shown) to which the CPU mounted on the camera is attached are connected via a lead wire 26b. In addition,
The terminal 26a of the film detecting element 26 is connected to the upper side wall 10
The terminal 26a is located along h and is protected by the upper side wall 10h. This film detection element 26
A light-shielding malt pad 27 is covered on the front surface of the.

Then, a holding plate 28 having an opening 28a which is formed so as to be superposed on the aperture opening 10b of the camera body 10.
However, it is assembled to the camera body 10 from the front of the camera body 10 with the set screw 28b. The light blocking plates 21 and 22 and the film detecting element 26 are attached to the camera body 10 by the pressing plate 28. As shown in FIG. 6, the light-shielding plates 21 and 22 have the bearing pin portion 21 in the recess 10f formed in the camera body 10.
a and 22a are accommodated and are rotatably supported by covering the bearing pin portions 21a and 22a with the pressing plate 28 from the front and closing the recess 10f.

The film detecting element 26 is shown in FIGS.
As shown in FIG. 5, together with the malt pad 27, it is pressed against and held by the pressing plate 28 against the front edge of the detection hole 10e. The portion of the holding plate 28 that presses the film detecting element 26 is a lid portion 28c having a shape sufficient to project forward of the other portions and to hold the film detecting element 26 and the malt pad 27. In addition, the terminal 26
A cut portion 28d through which a is inserted is formed.

FIG. 4 is a perspective view showing a device for detecting a DX code representing information on the film formed on the film cartridge, which is mounted on the outer surface of the cartridge chamber 10c of the camera body 10. DX for the holder member 31 of the detection device
A code detection circuit 32 is attached, and a DX code reading contact piece 33 is connected to the DX code detection circuit 32.
The detection portion of the DX code reading contact piece 33 penetrates through the through hole 10d formed in the cartridge chamber 10c and the cartridge chamber 10c.
exposed to c.

An amplification plate is provided on the side of the holder member 31.
34 is rotatably supported by a support pin 34a with the width direction of the camera body 10 as an axis. A fork portion 34b is formed at the rear end of the amplifying plate 34 as shown in FIGS. 6 to 9, and an amplifying pin 16e protruding from the tip of the input plate portion 16b of the switching plate 16 is provided. It is loosely inserted in the fork part 34b. A latching protrusion 35a is fixed to the lower end of the amplifying plate 34, and one end of a toggle spring 35 formed of a torsion coil spring is latched to the latching protrusion 35a.
The other end of 35 is a hooking pin 35b implanted in the holder member 31.
After the other end of the toggle spring 35 is hooked to the hooking pin 35b, the washer 36 is fixed to the hooking pin 35b so that the toggle spring 35 does not fall off the hooking pin 35b. is there. The distance from the support pin 34a to the hooking protrusion 35a is longer than the distance from the amplification pin 16e loosely inserted in the fork portion 34b to the support pin 34a. Further, as shown in FIGS. 6 to 8, an arc-shaped guide hole 34c having an appropriate length centered on the support pin 34a is formed at an appropriate position of the amplification plate 34, and the guide hole 34c is formed.
The guide pin 34d planted on the side of the holder member 31
Is inserted.

FIG. 5 is an exploded perspective view showing the erecting system and the eyepiece system of the finder. The prisms 41 and 42 constituting the erecting system are held by the lower case 40a and the upper case 40b of the prism holder. A field frame plate 43 and a pair of finder light blocking plates 44 and 45 for changing the field frame in accordance with the size of the photographing screen are arranged between the prisms 41 and 42. The light-shielding plates 44 and 45 for the viewfinder are used for the camera body 10
Rotatable around the height direction of the shafts 44a, 44b, 45a
, 45b by the lower case 4 of the prism holder respectively
It is supported by 0a and the upper case 40b. A drive lever 46 is fitted to the upper shaft 44a of the finder light-shielding plate 44, and a driven lever 47 is fitted to the upper shaft 45a of the finder light-shielding plate 45. Therefore, the drive lever 46 is centered on the shaft portions 44a, 44b, and the driven lever 47 is driven by the shaft portions 45a, 44b.
It is rotatable about 5b. The drive lever 46 and the driven lever 47 are rotatably linked by the engaging portions 46a and 47a, and when the drive lever 46 rotates, the driven lever 47 rotates in a direction opposite to the rotation direction of the drive lever 46. I am trying to move. The driven lever 47 has one end of a toggle spring 48, which is a twisted coil spring, hooked on it, and the other end of the toggle spring 48 is hooked on the upper case 40b.

An arm portion projects from the side portion of the drive lever 46, and a drive pin 46b is directed downward and protrudes below the arm portion. This arm extends laterally from the prism holder, and as shown in FIG.
46b is loosely inserted in the fork portion 13b of the switching drive plate 13. Therefore, when the switching drive plate 13 slides, the drive lever 46 on which the drive pin 46b is formed rotates about the shafts 44a and 44b of the finder light-shielding plate 44.

An eyepiece lens 49 is held in the upper case 40b of the finder. The eyepiece lens 49 is slidably supported in the optical axis direction of the finder by a shaft 50 in the depth direction of the camera body 10. When the diopter adjustment knob 51 is rotated, the eyepiece lens 49 slides in the optical axis direction. Adjust the diopter. In the figure, 52 is a push spring for urging the eyepiece lens 49,
A rear end portion of the shaft 50 is supported by a cover 53.
A finder cover 54 is placed on the upper part of the upper case 40b.

In FIG. 6, reference numeral 81 is the camera body.
It is a casing consisting of a front cover that houses 10.
Reference numeral 82 denotes a back cover that covers the rear portion of the camera body 10. The back cover 82 is provided with a pressure plate 82a.

The operation of the embodiment of the camera provided with the information detecting element holding structure constructed as described above will be described together with the operation of the light shielding plate driving mechanism of the camera.

The light-shielding plates 21, 22 are attached to the camera body 10 of this camera.
In order to incorporate the film detection element 26 together with the components of the drive mechanism such as the switching plate 16 for driving the same and the film detection element 26, first, the light shielding plate 21 is provided in the recess 10f formed on the front surface of the camera body 10.
The bearing pin portions 21a, 22a of 22 are held and the holder portion 29
Then, the film detecting element 26 and the malt pad 27 are held with the terminal 26a being placed along the upper side wall 10h of the holder portion 29. At this time, the tip of the film detecting element 26 is housed in the counterbore 29a of the camera body 10. Next, the opening 28a of the holding plate 28 is overlapped with the aperture opening 10b, the lid portion 28c is overlapped with the holder portion 29, and the bearing pin portions 21a and 22a of the light shielding plates 21 and 22 are provided with the predetermined holding plate 28a. The camera body 10
The pressing plate 28 is covered with the fixing plate 28, and the pressing plate 28 is fixed and fixed to the camera body 10 with the set screw 28b. Then, necessary wiring is performed, predetermined components are incorporated into the camera body 10, and the camera body 10 is housed in a casing (not shown), whereby the camera is completed.

FIG. 7 shows a state in which the light shielding plates 21 and 22 are retracted from the aperture and the photographing screen size is set to the normal size. In this state, the switching plate 16 is located above. The light blocking plates 21 and 22 are located at the normal size position by receiving the restoring force of the return springs 21c and 22c, and the input shaft portion 21b of the upper light blocking plate 21 is pressed by the input pin portion 16a of the switching plate 16 to lower the light blocking. The input shaft portion 22b of the plate 22 is pressed against the lower input portion 18c of the lower drive plate 18. In this state, when the photographer operates the switching knob 11 and slides it to the panoramic shooting side which is the right direction in FIG. 9, the switching drive plate connected to the switching knob 11 via the knob support portion 11a. 13 slides in the same direction. It should be noted that FIG. 9 shows a state in which the switching knob 11 is moved to the panoramic photographing side. Since the rotating plate 15 is connected to the switching drive plate 13, the rotating plate 15 moves in the clockwise direction in FIG. 9 about the shaft 15c and is positioned at the position shown in FIG. Become. Since the upper portion of the switching plate 16 is connected to the switching plate drive pin portion 15b of the rotating plate 15,
The switching plate 16 is pushed down from the position shown in FIG. 7 by the rotation of the rotating plate 15.

The input pin section 16 provided on the switching plate 16
The a pushes down the input shaft portion 21b of the upper light shield plate 21 against the restoring force of the return spring 21c, and the upper light shield plate 21 rotates clockwise around the bearing pin portion 21a in FIG. Therefore, the upper light shielding plate 21 occupies the upper part of the aperture as shown in FIG.

Input plate portion 16b formed under the light shielding plate 16
Moving downwards, the inclined surface 16c of the input plate portion 16b
Since the lower drive pin portion 18b of the lower drive plate 18 is pressed against the lower drive plate 18, the lower drive plate 18 is centered around the support pin 18a.
Rotate in the clockwise direction. Since the input shaft portion 22b of the lower light shielding plate 22 is pressed against the lower input portion 18c of the lower drive plate 18, the input shaft portion 22b is pushed up against the restoring force of the return spring 22c. It will be. Therefore, the lower light-shielding plate 22 rotates counterclockwise in FIG. 7 about the bearing pin portion 22a and occupies the lower portion of the aperture as shown in FIG. Therefore, as shown in FIGS. 6, 8 and 9, the upper and lower portions of the aperture are shielded by the upper light shielding plate 21 and the lower light shielding plate 22, respectively. The image will be taken in a panoramic size to which exposure is applied. The inclined surface 16c formed on the input plate portion 16b is lowered at an angle suitable for rotating the lower light shield plate 22 from the normal size position to the panorama size position in conjunction with the rotation of the upper light shield plate 21. The shape is such that the side drive plate 18 is rotated.

At the tip of the input plate portion 16b of the switching plate 16, the amplification plate 34 is inserted through a fork portion 34b in which the amplification pin 16e is loosely inserted.
7, the amplifier plate 34 rotates counterclockwise in FIG. 7 about the support pin 34a when the input plate portion 16b is pushed down. One end of the toggle spring 35 is hooked on the hooking protrusion 35a of the amplification plate 34, and the other end of the toggle spring 35 is hooked on the camera body 10 side. Will be pushed down against the restoring force of the toggle spring 35 in the initial stage of the downward movement. That is, in the initial stage of the movement of the switching plate 16, the latching protrusion 35a moves in the direction of approaching the latching pin 35b that latches the other end of the toggle spring 35, so that the latching protrusion 35a moves. Will receive the resilience of. Then, when the switching plate 16 passes the middle part of the sliding range, the latching protrusion 35a moves in a direction in which both ends of the toggle spring 35 are separated, and thereafter, the restoring force of the toggle spring 35 is switched. This assists the movement of the plate 16, and the movement of the switching plate 16 becomes smooth.

The amplifying plate 34 has a guide pin in the guide hole 34c.
Since 34d is loosely inserted, the rotation of the amplification plate 34 is restricted by the end of this guide hole 34c. When the light blocking plates 21 and 22 are located at the panorama size position, the end of the guide hole 34c collides with the guide pin 34d due to the restoring force of the toggle spring 35. Transmitted to the photographer. For this reason,
The photographer can recognize that the shooting screen size of the camera has been changed to the panoramic size.

Moreover, since the distance from the support pin 34a to the hooking protrusion 35a is longer than the distance between the amplification pin 16e and the support pin 34a, the amplification pin 16e, that is, the switching plate 16
The moving amount of the hooking protrusion 35a is larger than the moving amount of the.
Therefore, the toggle spring 35 can be reliably operated, and the restoring force of the toggle spring 35 can be sufficiently increased.
A click feeling can be surely generated. further,
Since the restoring force can be increased, the switching plate 16 can be reliably held in the normal size position and the panorama size position, and the light blocking plates 21 and 22 can be used even when the camera is inadvertently impacted.
Can be reliably maintained at each shooting screen size position.

In order to change the photographing screen size from the panoramic size to the normal size, the switching knob 11 is moved leftward from the position shown in FIG. The movement of the switching knob 11 causes the rotating plate 15 to rotate counterclockwise in FIG. 9 about the shaft 15c, so that the switching plate drive pin portion 15b pivots in the same direction to move the switching plate 16 to the position shown in FIG. It will be pulled up from the position shown in. When the switching plate 16 is pulled up, the input pin section 16
a is disengaged from the input shaft portion 21b of the upper light-shield plate 21, and the upper light-shield plate 21 is released from the constraint by the input pin portion 16a. Therefore, the upper light-shielding plate 21 rotates counterclockwise from the position shown in FIG. 8 in response to the restoring force of the return spring 21c and is positioned at the normal size position shown in FIG.

Further, the input plate portion formed under the switching plate 16
When 16b moves upward from the position shown in FIG. 8, the inclined surface 16c separates from the lower drive pin portion 18b of the lower drive plate 18 to release the lower drive plate 18 from the restraint of the input plate portion 16b. .
Therefore, the lower light-shielding plate 22 is also released from the restraint of the lower input portion 18c, receives the restoring force of the return spring 22c, and receives the lower drive plate 22.
Will rotate clockwise from the position shown in FIG. 8 to be in the normal size position shown in FIG. That is, the light shielding plates 21 and 22 are retracted from the upper and lower portions of the aperture to open the entire area of the aperture, and the entire area of the film 70 is exposed.

When the switching plate 16 moves upward from the position shown in FIG. 8, the amplification pin 16e protruding from the input plate portion 16b is pulled upward. Therefore, this amplification pin 16e and the fork part
The amplifying plate 34, which is linked via 34b, rotates clockwise around the support pin 34a from the position shown in FIG. This rotation causes the latching protrusion 35a to rotate, and at the initial stage of the upward movement of the switching plate 16, both ends of the toggle spring 35 are brought close to each other, and the switching plate 16 is moved against the restoring force of the toggle spring 35. I will let you. Then, beyond the middle of the movement range, the restoring force of the toggle spring 35 assists the movement of the switching plate 16, and at the end of the movement, the guide hole of the amplification plate 34.
The end of 34c collides with the guide pin 34d and a click feeling is generated.

Further, since the ejection position switching plate 25 of the date optical system 23 is engaged with the drive groove 16d of the switching plate 16, this ejection is accompanied by the vertical sliding of the switching plate 16. The position switching plate 25 also slides in the same direction. By the sliding of the injection position switching plate 25, the through hole portion 25b is positioned to open either the normal size emission portion or the panoramic size emission portion provided in the date optical system 23. That is, when the normal size shooting screen size is selected, the through hole portion 25b is located opposite to the normal size emitting part of the date optical system 23, and the panoramic size shooting screen size is selected. In this case, it will be located opposite to the panoramic size emitting unit.

Since the drive pin 46b of the finder is engaged with the fork portion 13 of the switching drive plate 13, the switching knob 11
Is operated and the switching drive plate 13 slides, the drive pin 46
The driving force is transmitted to b. The drive pin 46b is formed on the drive lever 46, and the drive lever 46 is fitted on the shaft portion 44a of the finder light-shielding plate 44, and is attached to the finder light-shielding plate.
Since the shaft 44 is rotatably supported by the shafts 44a and 44b, the drive lever 46 is driven by the driving force by the shaft 44a and 44b.
It will rotate around b. This drive lever 46
Is fitted to the upper shaft 44a of the finder light shielding plate 44, so that when the drive lever 46 rotates, this upper shaft 44a also rotates and the finder light shielding plate 44 also rotates. A driven lever 47 is rotatably connected to the drive lever 46 by engaging portions 46a and 47a, and the driven lever 47 is an upper shaft of a finder light shielding plate 45.
It is fitted to 45a, and this finder shading plate 45 has a shaft 45a.
, 45b are rotatably supported. That is, when the drive lever 46 rotates, the driven lever 47 rotates about the shaft portions 45a and 45b in the direction opposite to the rotation direction of the drive lever 46, and the finder light shielding plate 45 causes the drive lever 47 to rotate. Rotate in the same direction as. Therefore, if the viewfinder light-shielding plates 44, 45 are rotated in accordance with the moving direction of the switching knob 11 for selecting the image-taking screen size, the viewfinder light-shielding plates 44, 45 are used for the normal-size shooting screen. When the size is selected, it is retracted from the view frame of the view frame plate 43, and when the panorama size shooting screen size is selected, the pair of opposite edges of the view frame are occupied to open the view frame. It can correspond to the shooting screen size. Further, since one end of the toggle spring 48 is hooked on the driven lever 47, the finder light shielding plates 44, 45 can be smoothly rotated by the action of the toggle spring 47.

Further, when the film 70 is loaded in this camera, the film detecting element 26 detects this and, for example, the initial feeding for positioning the first frame of the film 70 at the aperture is performed, and the release operation is performed. A film detector to ensure that the film 70 is fed one frame when finished.
26 counts the perforations 71 that pass by the running of the film 70.

In this embodiment, the information detecting element is a film 70.
The film detection element used for counting the number of shots and the like by counting the presence or absence of the perforation 71 and the number of perforations 71 has been described, but in the case of a camera using a film with a magnetic recording band formed on the edge, the information detection element is A magnetic head that detects this magnetic information can also be used. When a magnetic head is used as the information detecting element, it is possible to write information such as the photographing date and exposure conditions on the magnetic recording band formed on the film.

[0043]

As described above, according to the information detection element holding structure incorporated in the camera according to the present invention, the information detection is performed by the holding plate which holds the light shielding plate for changing the photographing screen size in the camera body. Since the element is held, the number of parts can be reduced and the assembling work can be simplified. Therefore, the manufacturing cost of the camera can be reduced, which further contributes to the spread of the camera.

Further, since the number of parts is reduced, the management of parts can be simplified.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view schematically showing a holding structure for an information detecting element according to the present invention.

FIG. 2 is a vertical cross-sectional view showing an outline of a holding structure of an information detecting element according to the present invention.

FIG. 3 is an exploded perspective view of a camera body of a camera provided with the information detection element holding structure according to the present invention.

FIG. 4 is an exploded perspective view of a DX code detection device for a camera provided with the information detection element holding structure according to the present invention.

FIG. 5 is an exploded perspective view showing an upright system and an eyepiece system of a finder of a camera provided with the information detection element holding structure according to the present invention.

FIG. 6 is a vertical cross-sectional view for explaining the drive mechanism of the light shielding plate of the camera including the information detection element holding structure according to the present invention, in which the light shielding plate occupies a part of the aperture. It is a figure.

FIG. 7 is a side view showing a drive mechanism of a light shielding plate of a camera having the information detecting element holding structure according to the present invention, showing a state in which the light shielding plate is retracted from the aperture.

FIG. 8 is a side view showing a drive mechanism of a light shielding plate of a camera provided with the information detection element holding structure according to the present invention, showing a state in which the light shielding plate occupies a part of the aperture.

FIG. 9 is a front view showing a drive mechanism of a light shielding plate of a camera provided with a structure for holding an information detecting element according to the present invention, showing a state in which the light shielding plate occupies a part of the aperture.

FIG. 10 is a side view for explaining the conventional holding structure of the information detecting element, which is a view corresponding to FIG. 2;

[Explanation of symbols] 10 Camera body 10b Aperture opening 10e Detection hole 10f Recess 10g Wall 10h Wall 11 Switching knob 13 Switching drive plate 15 Rotating plate 16 Switching plate 17 Lens barrel 18 Lower drive plate 21 Upper side Light shield 22 Lower light shield 23 Date optical system 26 Film detection element (information detection element) 26a Terminal 26b Lead wire 27 Malt pad 28 Holding plate 28a Opening 28b Set screw 28c Lid 28d Notch 29 Holder 29a Counterbore 31 Holder member 32 DX code detection circuit 34 Amplification plate 35 Toggle spring 70 Film 71 Perforation

Claims (2)

[Claims] 1. A photographing method for changing a photographing screen size by reciprocally reciprocating a light shielding plate rotatably supported by a pair of facing apertures about an axis along an edge thereof with respect to the aperture. In a camera with a screen size switching device, a pair of the light-shielding plates to be incorporated from the front of the camera body and the film provided by being incorporated from the front of the camera body to face appropriate portions of the film loaded in the camera are provided. An information detecting element for detecting information, and a holding plate having a portion for holding the light shielding plate and the information detecting element, and in a state where the light shielding plate and the information detecting element are arranged in a predetermined portion of the camera body. Information to be incorporated in a camera characterized in that the light shielding plate and the information detecting element are held in the camera body by fixing the holding plate to the camera body. Holding structure of the detecting element. 2. The holding structure for an information detecting element incorporated in a camera according to claim 1, wherein the information detecting element is an optoelectric element arranged so as to face the perforation of the film.