JPH086151A - Optical device screen changing device - Google Patents

Abstract

PURPOSE:To provide a screen changing device having an improved assembling workability by making a device assembling direction coincident with a camera structure assembling direction. CONSTITUTION:In the process of assembling the camera, a slider 5 with a formed vertical groove 5a is positioned on the lower end surface of the camera main body 18 and held by a pressing plate 19, on the other hand, a camera base cover 2 with a knob for controlling the screen change 1 and a click spring 3 attached is moved from the lower side of the camera main body 18 upward in a vertical direction so that the base cover may be attached with the camera main body 18, and at this time, the projecting part 1a of a lever 1 is inserted into the groove 5a of the slider 5 so that the slider 5 may be engaged with the lever 1. Thus, the direction of the camera structure assembling operation is coincident with the direction of the screen changing device assembling operation, so that the assembling workability is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen changing device for an optical device such as a camera.

[0002]

2. Description of the Related Art An example of a conventional technique related to the present invention will be described with reference to FIGS.

FIG. 10 is a rear perspective view of a known single-lens reflex camera. In FIG. 10, reference numeral 52 denotes a camera bottom lid which is a member for forming an exterior body of the camera, and 51 denotes a horizontally long window penetrating the back surface of the bottom lid 52. Is a screen change operation lever movable along the direction of arrow c.

FIG. 11 shows an exploded perspective view of a screen changing device including the lever 51, and FIG. 12 shows a cross sectional view of the bottom cover 52 and the camera body 60 to which the screen changing device is attached.

As shown in FIG. 11, a horizontally long window 52a is provided on the back surface of the bottom lid 52, and the bottom lid 52 is sandwiched with the window 52a interposed therebetween.
A rail surface (not shown) for guiding the lever 51 in the direction of arrow c is formed on the outer surface of the. A screw hole (also not shown) for screwing the screw 54 is provided on the front surface (not visible in FIG. 11) of the lever 51.

A horizontally long plate member 53 is arranged on the inner surface of the bottom lid 52 so as to face the window 52a. The plate member 53 is integrated with a slider 55 described later and is slid on the inner surface of the bottom lid 52 by a screw 54. It is movably pressed. A screw insertion hole (a hole having a diameter larger than the outer diameter of the screw 54) 53b for inserting the screw 54 is formed through the plate member 53, and the hole 53 is formed.
Small holes 53d for passing dowels (not shown) protruding from the front surface of the lever 51 are provided at positions on both sides of b for coupling with the slider 55. Further, a horizontal bent portion 53c is formed above the hole 53b, and a U groove portion penetrating the bent portion 53c is fitted to the dowel 55a on the upper surface of the slider 55. It has a structure for pressing a spring described later. Further, one end side of the plate member 53 extends laterally, and a bent portion 53a bent in a V shape is formed at the tip thereof, and the bent portion 53a is formed on the inner surface of the bottom lid 52. It is adapted to fit in the concave portion of the letter-shaped uneven portion (not shown). That is, the plate member 5
3 is a click spring for giving the lever 51 a click feeling.

A hole 55b for inserting a screw 54 is formed through the slider 55, and the screw 54 is screwed into the screw hole provided on the back surface (front surface) of the lever 51, whereby the slider 55 and the plate member are 53 (hereinafter referred to as a click spring) and the lever 51 are integrated,
By moving the lever 51 in the direction of the arrow c, the slider 55 and the click spring 53 also move together with the lever 51, and the bent portion 53a of the click spring 53 causes the camera bottom cover 52 to move.
The lever 51 is clicked and stopped by engaging with a recess (not shown) on the inner surface of the lever.

A dowel 5 formed on the upper surface of the slider 55.
The circular portion of the torsion coil spring 56 having two legs is fitted to the portion 5a, and the two legs of the spring 56 hold the lower end portion 57a (see FIG. 12) of the photographing screen switching lever 57. The lever 57 is swingably supported by the camera body 60 around a fixing pin (not shown) inserted in a shaft hole 57b parallel to the optical axis of the camera. The lever 57 has an L-shaped first light shielding member 58 at a pin hole 57c at one end.
The lever 57 has a pin hole 5 at the other end.
In 7d, it is pin-connected to one end of the L-shaped second light shielding member 59.

Therefore, when the lever 51 is moved rightward in FIG. 11, for example, the click spring 53 and the slider 55 are also moved rightward together with the lever 51, and the lever 57 is centered on the shaft hole 57b. As a result, the light blocking member 58 is moved vertically upward, and the other light blocking members 59 are moved vertically downward, so that the size of the photographing screen (that is, the aperture of the camera) is increased or decreased. The image is reduced in size and the shooting screen is switched to a so-called panoramic screen.

[0010]

The above-described screen changing device has the following problems. This is because the workability in attaching the screen changing device to the camera is poor, the efficiency of the camera assembly process is low, and the camera assembly cost is high. To clarify this point
The conventional assembling work of the camera will be described below with reference to FIG.

The lever 51 is positioned outside the bottom lid 52 with respect to the window 52a on the rear surface of the camera bottom lid 52, and a click spring 53 and a slider 55 are provided inside the bottom lid 52 in the window 52a. Position relative to. further,
The screw 54 is inserted into the screw insertion hole 55b of the slider 55, the hole 53b of the click spring 53, and the window 52a of the bottom lid 52, and is screwed into a screw hole (not shown) of the lever 51, so that the slider 55, the click spring 53, and the Lever 51
And the three are integrated and the three are attached to the camera bottom cover 52.

Next, the lever 51 and the click spring 53
Also, the bottom lid 52 to which the slider 55 is attached is attached to the camera body 60. At this time, the spring 56 attached to the slider 55 and the lower end portion 57a of the lever 57 are accurately engaged in a predetermined state. I have to However, in the case of the conventional structure described above, the direction in which the bottom cover 52 is attached to the camera body 60 (the direction of arrow d in FIG. 11) and the direction in which the foot of the spring 56 is engaged with the lower end portion 57a of the lever 57 (FIG. 11). Direction (in the direction of arrow e) of the bottom cover 52, the foot of the spring 56 is engaged with the lower end portion 57a of the lever 57, and the bottom cover 52 is slanted and gradually shifted. Camera body 6
Since it was attached to 0, workability was very poor and inefficient.

An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and provide an improved screen changing device.

[0014]

In order to solve the above-mentioned problems, the direction in which the camera bottom cover 52, which is the exterior body forming member of the camera, is attached to the camera body 60, the slider 55 and the click spring 53 are attached to the photographing screen switching lever 57. Lower end 5
It is desirable that the direction of the operation of engaging with 7a is the same. The present invention is configured based on such an idea, and the structure for attaching the slider to the camera bottom cover is abolished, and the slider is held slidably on the camera body and is attached to the camera bottom cover. The problem of the prior art is solved by configuring the lever and the like to engage with the slider from the lower side of the camera body. That is, in the screen changing device of the present invention, the slider that engages with the lower end of the shooting screen switching lever is held in the camera body,
A groove extending in the vertical direction is formed on the slider, and a pin-shaped protrusion that fits into the groove is provided on the screen change operation lever.
When the camera bottom cover is attached to the camera body, the protrusion is configured to be inserted into the groove from below.

[0015]

As shown in FIG. 1, in the assembling process of the camera having the screen changing device of the present invention, the slider 5 having the vertical groove 5a formed therein is positioned on the lower end surface of the camera body 18 to hold the pressing plate. While holding down with 19, the camera bottom cover 2 to which the screen change operation lever 1 and the click spring 3 are attached is moved vertically downward from the lower side of the camera body 18 to attach the bottom lid 2 to the camera body 18, At that time, the slider 5 and the lever 1 are engaged by inserting the pin-shaped projection 1a of the lever 1 into the vertical groove 5a of the slider 5 from the lower side. Therefore, since the direction of the assembling operation of the camera structure and the direction of the assembling operation of the screen changing device are the same, the assembling workability is improved.

[0016]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 is an exploded perspective view of a main part of a screen changing device constructed by applying the present invention. In the figure, 1 is a screen change operation lever movable in the arrow a direction, 2 is a camera bottom cover, 3 is a click spring integrated with the lever 1 by a screw 4, and 5 is the lever 1 and the arrow a direction. A slider 7 for moving to the position of the photographing screen switching lever 7, which is swingable around a fixing pin (not shown) inserted in the shaft hole 7b.
Is an L-shaped first light-shielding member pivotally attached to one end of the lever 7 at the projecting pin 8a, and 9 is an inverted L-shaped second light-shielding member pivotally attached to the other end of the lever 7 at the projecting pin 9a. Light-shielding member, 1
Reference numeral 0 denotes an inverted L-shaped finder switching lever which is rotatable about a fixing pin (not shown) inserted in a hole 10b having an axis parallel to the shaft hole 7b and whose one end is locked by the slider 5, and 11 The cam plates 12 and 13 which are engaged with the tip portion 10c of the lever 10 and are given a vertical force by the tip portion 10c, 12 and 13 are rollers 12a which follow the cam sliding portion 11b of the cam plate 11 and A rocking lever having 13a at one end and finder field frames 12b and 13b at the other end, 14 is a well-known mirror box containing a not-shown rocking mirror, and 15 is a well-known mirror box built in the mirror box 14. A focusing screen, 16 is a known field mask fixed to the mirror box 14, and 17 is a known pentaprism.

The mutual relationship between the above-mentioned components will be described in detail below.

Two pin-shaped projections 1a are provided on the back surface, that is, the front surface side of the screen changing operation lever 1, and the projections 1a pass through the window 2a of the camera bottom cover 2 and are provided on both sides of the click spring 3. And is also inserted in the inverted U-shaped groove 5a at the lower end of the slider 5. In the click spring 3, the screw 4 inserted in the central hole is
By screwing into the screw hole (not shown) on the front of
It is movable integrally with the lever 1 via the screw 4. Further, a V-shaped bent portion 3a provided at one end of the click spring 3 engages with a recess (not shown) formed on the inner surface of the camera bottom cover 2 and serves to give a click feeling to the lever 1. .

A groove 5d parallel to the lateral direction of the camera (that is, the movable direction of the lever 1) is formed on the top surface of the slider 5.
The groove 5d is adapted to be slidably fitted to a rail 18a protruding from the lower end surface of the camera body 18 as shown in FIG. A dowel 5c is projectingly provided on the top surface of the slider 5 like the conventional slider, and an annular portion of a torsion coil spring 6 is fitted on the dowel 5c, and a foot portion of the spring 6 is attached to the lever 7. It engages with the lower end 7a (FIG. 4).

On the tip side of the top surface of the slider 5, a projection 5b having a shape obtained by cutting a cylinder in half is formed. The projection 5b is provided with the lower end 10a of the finder switching lever 10. Engaged.

The tip 10c of the horizontal side of the finder switching lever 10 is engaged with the lower end 11a of the cam plate 11, and when the lever 10 is swung counterclockwise about the hole 10b, the lever 10 is rotated. The lower end 11a of the cam plate 11 is pushed down by the tip 10c of the. A vertical groove 11c is formed through the cam plate 11, and cylindrical projections 14b ₁ and 14b ₂ provided on the side surface of the mirror box 14 are inserted into the groove 11c so as to be slidable relative to each other. Only part of the outer peripheral surface of each of the protrusions is in contact with the wall surface of the groove 11c. That is, the cam plate 1
1 is vertically movable along the side surface of the mirror box 14 while being guided by the _two projections 14b ₁ and 14b ₂ .

The cam plate 11 is always urged upward by a spring (not shown). The cam plate 11 has a cam sliding portion 11b which projects to both sides as shown in the figure,
Rollers 12a and 13 are provided on the outer peripheral edge of the cam sliding portion 11b.
The outer peripheral surface of a is pressed.

Two pins 14a projecting from the side surface of the mirror box 14 are inserted into holes 12c and 13c penetrating the intermediate portions of the swing levers 12 and 13, respectively.
The levers 12 and 13 have respective holes 12c and 13c
The lever 12 is urged clockwise by a spring (not shown), and the lever 13 is urged counterclockwise by a spring (not shown). 12a and 13a are pressed against the outer peripheral edges of the two cam sliding portions 11b of the cam plate 11.

The viewfinder field frames 12b and 13b are inserted into the mirror box 14 through two longitudinally extending holes 14c penetrating the side plate of the mirror box 14, and at a position below the field mask 16. It is designed to be moved in a direction in which they approach or separate from each other in a substantially horizontal plane.

When the photographing screen of the camera is set to the standard screen, the horizontal side portions of the two light shielding members 8 and 9 are stopped at the positions farthest from each other, and the mirror box 14 as shown in FIG. The photographing opening 14d penetrating the back surface of the is completely opened. Further, the swing lever 7 is in a state in which the right end (that is, the end pivotally attached to the projecting pin 8a of the light shielding member 8) is lowered in FIGS. 3 and 4, and the slider 5 is provided with the window 2a of the camera bottom cover 2. To the leftmost position. On the other hand, the finder switching lever 10 is in a state of being pivoted most clockwise about the pin hole 10b which is the pivot center, and the tip 10c of the horizontal side portion of the lever 10 (that is, the tip portion 11a of the cam plate 11). (The part that is engaged with) is in the highest raised state. Since the cam plate 11 is not receiving the pushing-down force from the lever 10, the cam plate 11 is in the state of being pulled up to the uppermost position as shown in FIG. 5 by the force of the spring (not shown), and the lower cylindrical protrusion 14b ₁ is cammed. It is in a state of being located at the lower end of the groove 11c of the plate 11. Then, the respective rollers 12a and 13a of the swing levers 12 and 13 are 2
The cams are separated from the cam sliding portion 11b, and therefore, as shown in FIGS.
Since b is at the farthest position from each other and is retracted from the opening of the visual field mask 16, the viewfinder screen is also a standard screen.

When the photographing screen is changed from the standard screen of FIG. 4 to the vertical size reduction screen (that is, the panoramic screen), the camera user moves the lever 1 to the right in FIG. Then, the click spring 3 and the slider 5 are also moved to the right together with the lever 1, and as a result, the lower end portion 7a of the lever 7 and the vertical side portion 1 of the finder switching lever 10 are moved.
Since 0a is moved to the right by slider 5,
The lever 7 is rotated counterclockwise about the shaft hole 7b, and at the same time, the lever 10 is also rotated counterclockwise about the hole 10b. Therefore, the left end of the lever 7 (that is, the pivot point of the light shielding member 9 with the protruding pin 9a) descends,
Since the right end of the lever 7 (that is, the pivot point of the light blocking member 8 with respect to the projecting pin 8a) rises, both the light blocking members 8 and 9 are moved toward each other, and as a result, as shown in FIG. The upper and lower edges of the opening 14d are shielded by the horizontal side portions of both the light shielding members 8 and 9, and the photographing screen is switched to the panoramic screen.

On the other hand, when the lever 10 is rotated counterclockwise about the hole 10b, the tip 10c of the horizontal side of the lever 10 pushes down the tip 11a of the cam plate 11, so that the cam plate 11 of FIG. It descends from the position to reach the position shown in FIG. 8, and as a result, the rollers 12a and 13a of the levers 12 and 13 engage with the outer peripheral edge of the cam sliding portion 11b and the vertical edge portion of the cam sliding portion 11b ( That is, since it is in a state of being engaged with the maximum lift portion of the cam sliding portion 11b,
Field frames 12b and 13b at the upper ends of the levers 12 and 13
Are in the state of being closest to each other as shown in FIGS. 8 and 9, and therefore the viewfinder field is also changed to the panoramic screen as shown in FIG.

Next, with reference to FIGS. 1 and 3, the method of connecting the lever 1 and the slider 5 of the present invention will be described in detail.

In the screen changing device of the present invention, as shown in FIG. 3, the screen changing operation lever 1 and the slider 5 are not rigidly connected to each other with a screw or the like, and the pin-shaped protrusion of the lever 1 is not used. 1a is a connection inserted in the vertical groove 5a of the slider 5. Therefore, in order to connect the lever 1 and the slider 5 in the camera assembling work, the protrusion 1a may be inserted into the groove 5a from the lower end of the slider 5. That is, the direction of the mounting operation when the lever 1 and the slider 5 are coupled is as shown by the arrow b in FIG.
(The direction from the bottom to the top), and this direction coincides with the direction of the mounting operation for mounting the camera bottom cover 2 toward the lower end of the camera body 18 (see FIGS. 1 and 2). Therefore, according to the configuration of the screen changing apparatus of the present invention, when attaching the camera bottom cover to the lower end of the camera body as in the prior art, when attaching the bottom cover to the body, the spring 6 and the lever 57 (see FIG. 11). It is not necessary to attach the bottom cover while moving in the optical axis direction so as to engage with (the lever 7 in FIG. 3).

Based on the above, the assembling work of the camera having the screen changing apparatus of the present invention will be described with reference to FIG.

First, the lever 1 and the click spring 3 are attached to the bottom cover 2 with screws 4. On the other hand, the slider 5 is moved upward from the lower side with respect to the lower end surface of the camera body 18 so that the groove 5d on the upper surface of the slider 5 fits into the rail 18a on the lower end surface of the camera body 18. Attach to. At this time, if the rail 18a of the camera body 18 is fitted into the groove 5d of the slider 5, the foot of the spring 6 and the lower end portion 7a of the lever 7 are naturally engaged, so that the slider 5 is attached to the camera body 18. No complicated mounting work is required when mounting.

To attach the slider 5 to the camera body 18, as shown in FIGS. 1 and 2, for example, the slider 5 is moved upward from the lower side of the camera body 18 and the lower portion of the camera body 18 is inserted into the groove 5d of the slider 5. End rail 18
After fitting a and positioning them, the camera body 1
The slider 5 is supported by the pressing plate 19 attached to the slider 8, and the bottom cover 2 (the lever 1 and the click spring 3 are already fixed) is moved upward from the lower side of the slider 5 while maintaining this state. The bottom cover 2 may be attached to the camera body 18 by pushing up in the direction of arrow b in FIG.
At this time, it is necessary to position the bottom cover 2 and the camera body 18 so that the protrusion 1a of the lever 1 fits in the vertical groove 5a of the slider 5, but the contour of the bottom cover 2 is positioned with respect to the camera body 18. Then, the protrusion 1a will naturally be in the groove 5a.
Since it is positioned at, no complicated attention is required for this work.

<Correspondence between Invention and Embodiment> The "light-shielding means" described in the claims is the light-shielding member 8 described in the embodiment.
9 and 9, the "light-shielding means" may have a structure other than the light-shielding members 8 and 9, as a matter of course.

The "transmitting means" described in the claims corresponds to a component of the concept corresponding to the "slider 5" described in the embodiment, but the "transmitting means" need not be the "slider 5" itself. Any motion transmitting means having the same function as the slider may be used.

The "operating means" described in the claims corresponds to the "screen changing operation lever 1" described in the embodiment, but the "operating means" may have a structure other than the lever 1. Of course.

[0037]

As described above, according to the present invention, the projection 1a provided on the screen-changing operation lever 1 is inserted into the vertical groove 5a of the slider 5 from the lower side so that Since the slider and the slider are engaged with each other, the direction of the assembling operation of the screen changing device and the direction of the assembling operation of the camera structure coincide with each other, and as a result, the workability in the camera assembling process is improved as compared with the prior art. Therefore, it is possible to contribute to improvement in manufacturing efficiency of optical devices such as cameras and cost reduction.

[Brief description of drawings]

FIG. 1 is a diagram for explaining a mounting operation of the screen changing device and a mounting work of a camera body and a camera bottom cover in a camera having the screen changing device of the present invention, and is an enlargement seen from a side of the camera. Vertical sectional view.

FIG. 2 is a view for explaining a mounting state when the slider 5 which is one component of the screen changing device is mounted on the lower end of the camera body 18, as in FIG. The longitudinal cross-sectional view which expanded the lower end part.

FIG. 3 is an exploded perspective view showing a screen changing device of a single-lens reflex camera having the screen changing device of the present invention and a related structure of the device.

FIG. 4 is a diagram showing a state in which an exposure opening is opened and a shooting screen is a standard screen in the structure of FIG. 3;

FIG. 5 is a diagram showing a state in which the viewfinder screen operating member is set to be a standard screen on the viewfinder screen in the structure of FIG. 3;

FIG. 6 is a view showing a state in which a finder screen is set to a standard screen in the structure of FIG.

FIG. 7 is a diagram showing a state in which the exposure opening is set to a “panorama screen” in the structure of FIG. 3;

FIG. 8 is a diagram showing a state in which the viewfinder screen operating member is set to be a “panorama screen” on the viewfinder screen in the structure of FIG. 3;

FIG. 9 is a diagram showing a state where the viewfinder screen is set to a “panorama screen” in the structure of FIG. 3;

FIG. 10 is a rear perspective view of a conventional single-lens reflex camera having a screen changing device.

11 is an exploded perspective view showing a configuration of a conventional screen changing device incorporated in the camera of FIG.

FIG. 12 is an enlarged vertical cross-sectional view in the vicinity of the bottom of the camera, for explaining the work at the time of assembling the camera having the screen changing device of FIG.

[Explanation of symbols]

1 ... Screen change operation lever 2 ... Camera bottom cover 3 ... Click spring 4 ... Screw 5 ... Slider 6 ... Screw coil spring 7 ... Shooting screen switching lever 8,9 ... Shading member 10 ... Finder switching lever 11 ... Cam plate 12,13 ... Swing levers 12a, 13
a ... Follower rollers 12b, 13b ... Viewfinder field frame 14 ... Mirror box 14a ... Pin 14b ₁ . 1
4b ₂ ... Cylindrical protrusion 15 ... Focus plate 16 ... Field mask 18 ... Camera body 19 ... Press plate 51 ... Screen change operation lever 52 ... Camera bottom lid 53 ... Click spring 54 ... Screw 55 ... Slider 56 ... Screw recoil spring 57 ... Shooting Screen switching lever 58, 59 ...
Light-shielding member 60 ... Camera body

Claims (1)

[Claims] 1. A light blocking member movable between a first position for blocking a part of an exposure opening of an optical device such as a camera and a second position retracted from the exposure opening, and a main body of the optical device. And a transmission means for transmitting a force for moving the light shielding member between the first position and the second position, while being held by the exterior body forming member of the optical device. An operating means that engages with the transmitting means,
An optical device, characterized in that a direction in which the operating means and the transmitting means are engaged with each other is aligned with a direction in which the main body of the optical device and the exterior body forming member are assembled. Screen change device.