JPH0615054U - Camera exposure range switching mechanism - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent the camera from increasing in size by providing an exposure range switching mechanism. [Structure] Driven by light-shielding plates 3 and 4 held by a camera body 1 movably along the film surface between an exposure range restriction position that covers a part of the exposure range of the film surface and an open position that opens the entire exposure range. The plates 5 and 6 are connected, and the drive plates 5 and 6 are connected.
An operation member 14 connected to 6 is provided at a position on the rear surface side of the lower end portion of the camera body 1 so as to be operable from the outside.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a mechanism for switching the exposure range of a camera.

[0002]

[Prior art]

 Conventionally, in addition to full size shooting where the entire shooting area of each frame of film is used for one exposure, half size shooting where about half of the shooting area of each frame is used, and the upper and lower edges are covered with a predetermined width. Then, a camera capable of panorama photography that exposes only the horizontally long portion remaining in the meantime is provided. In this way, when performing full-size shooting and half-size shooting or panoramic shooting in a mixed manner on one film, a mechanism for changing the exposure range by changing the size of the shooting frame is provided.

The exposure range is preferably switched as close as possible to the film surface in order to prevent blurring of the image frame reflected on the film surface and to maintain constant accuracy. Therefore, the exposure range switching mechanism is provided so that, for example, a movable shading plate is arranged immediately before the film surface, a driving member is connected to the shading plate, and the driving member can be operated from the outside. It is configured to drive the light shielding plate by being moved by the operation member.

[0004]

[Problems to be solved by the device]

 However, especially in the case of single-lens reflex cameras, a focal plane shutter is provided immediately in front of the film, and many mechanical parts are densely arranged around it, so by providing this exposure range switching mechanism. However, it is necessary to shift the positions of other mechanical parts, which may increase the size of the camera.

Therefore, a technical problem to be solved by the present invention is to prevent the camera from increasing in size by providing an exposure range switching mechanism.

[0006]

[Means for Solving the Problems]

 In order to solve the above technical problem, the exposure range switching mechanism of the camera according to the present invention is configured as follows. That is, the shading plate movably held by the camera body along the film surface between the exposure range control position that covers a part of the exposure range of the film surface and the open position where the entire exposure range is opened, and the shading plate. The camera body is provided with a drive member that is connected and configured to be movable along the film surface, and an operation member that is connected to the drive member and that is attached to the camera body so that the drive member can be operated from the outside. It is characterized in that it is placed at the position on the rear side of the lower end of the camera, specifically, at a position below the back cover of the camera or at a position near the back cover on the bottom surface of the camera.

[0007]

[Action / effect]

 In the above configuration, by operating the operation member from the outside to move the drive member, the light shielding plate connected to the drive member is moved parallel to the film surface between the exposure range regulation position and the open position. Can be moved in any direction. In this case, since both the light shielding member and the driving member can be moved along the film surface, both members can be formed in a thin plate shape, and therefore, both members can be slightly moved between the film surface and the focal plane shutter. Can be placed in any space.

Further, since a pentagonal roof prism is usually located above both members, and a cartridge chamber and a spool chamber are located on the left and right of both members, the operation member is placed at the upper part or the left and right positions of the camera. If it is arranged, the arrangement of the pentagonal roof prism, the cartridge chamber, the spool chamber, etc. will be shifted, or a connecting mechanism will be required to bypass these and connect the operating member and the drive member, and the camera will be large, but with the above configuration. According to this, since the operation member is provided at the position on the rear surface of the lower end portion of the camera, the movement of the operation member can be directly transmitted to the drive member, so that the size of the camera can be prevented from increasing.

[0009]

【Example】

 A camera having an exposure range switching mechanism according to an embodiment of the present invention shown in FIGS. 1 to 11 will be described in detail below. This switching mechanism is configured to switch between the exposure range for full-size photography and the exposure range for panoramic photography in single-lens reflex cameras.

FIG. 1 is a plan view showing the outline of the basic configuration inside the camera, and FIG. 2 is a front view. As shown in the figure, the body 1 has an aperture 1a and a film rail surface 1b in the central portion, and a cartridge chamber 1c and a spool chamber 1d on both side portions thereof. Reference numeral 2 is a focal plane shutter unit which is arranged between the cartridge chamber 1c and the spool chamber 1d with a slight space left from the exposed surface of the film. A mirror box (not shown) is arranged in front of the focal plane shutter unit 2, and a penta prism 12 is arranged above it.

The exposure range switching mechanism of this embodiment is arranged in a small space between the body 1 and the shutter unit 2 (the portion indicated by the symbol A in FIG. 1). If this mechanism is arranged in front of the shutter unit 2, problems such as blurring of the image frame projected on the film surface and deterioration of the dimensional accuracy thereof occur, but in this embodiment, it is immediately before the film. Since it is located at, it is possible to prevent such problems from occurring.

Next, details of the exposure range switching mechanism will be described with reference to FIGS. 3 to 5. 3 and 4 are rear views of this mechanism, FIG. 3 showing a full-size image pickup, and FIG. 4 showing a panoramic image pickup. FIG. 5 is a perspective view of this mechanism as seen from the front. As shown in the figure, L-shaped light-shielding plates 3 and 4 for restricting the exposure range are arranged substantially vertically above and below the aperture 1a of the camera body 1. The light-shielding plates 3 and 4 have elongated holes 3a and 4a on the side of the short side located beside the aperture 1a. The elongated holes 3a and 4a allow the guide pins 9 fixed to the camera body 1 to move. Is attached to. Further, the light shielding plates 3 and 4 have pins 10 and 11 at the base ends of the long side portions located above and below the aperture 1a.

Above and below the aperture 1a, drive plates 5 and 6 each formed in a substantially L shape are arranged substantially vertically symmetrical with each other and substantially symmetrically with the light shielding plates 3 and 4. The drive plates 5 and 6 are connected to the light shielding members 3 and 4 by inserting the pins 10 and 11 into the long holes 5b and 6b formed at the tips of the long side portions thereof. The drive plate 5 is held by a fulcrum shaft 7 fixed to the camera body 1, and the drive plate 6 is held by a fulcrum shaft 8 so that substantially the center of the portion on the short side thereof is rotatable. A convex portion 5a is formed at the tip of the short side portion of one drive plate 5, and a concave portion 6a with which the convex portion 5a engages is formed at the opposite portion of the other drive plate 6. With the above configuration, when the drive plate 5 rotates counterclockwise about the fulcrum shaft 7, the drive plate 6 rotates clockwise about the fulcrum shaft 8 and conversely the drive plate 5 rotates about the fulcrum shaft. When it is rotated clockwise about the center 7, the drive plate 6 is rotated counterclockwise about the fulcrum shaft 8.

The drive plates 5 and 6 can be moved by the operation member 14. As shown in the exploded perspective view of FIG. 6, the operation member 14 has two projecting pieces 14b on the front surface of a rectangular board portion 14a and an operation protrusion 14c on the back surface. It is attached to the lower end of the camera body 1 so as to be slidable left and right. The two projecting pieces 14b are arranged at positions sandwiching the pin 13 provided on the drive plate 5 from both left and right sides, and the operating portion 14c is mounted on the camera as shown in FIG. 7 which is a rear view of the camera. Further, it slightly protrudes from the body to the back side below the back cover 15.

In the above configuration, the exposure range can be switched from the full size shooting state to the panorama shooting state as follows. First, the operation member 14 is slid rightward in the drawing from the position shown in FIG. Then, the drive plate 5 rotates counterclockwise about the fulcrum shaft 7 while the pin 13 moves upward between the projecting pieces 14. At this time, since the convex portion 5a of the drive plate 5 and the concave portion 6a of the drive plate 6 are engaged, the drive plate 6 simultaneously rotates in the clockwise direction about the fulcrum shaft 8. Therefore, the drive pin 10 receives an upward force and the drive pin 11 receives a downward force, so that the light shielding member 3 keeps the long side portion parallel to the long side of the aperture 1a. While moving upward, the light-shielding member 4 moves downward while keeping the long side of the film parallel to the long side of the aperture 1a, and as a result, as shown in FIG. The edge part of the is covered and the exposure range is regulated (exposure range regulation position). On the contrary, by moving the operation member to the left in the figure from this panoramic shooting state, the light shielding plates 3 and 4 are retracted to the outside of the aperture 1a in the opposite movement to the case of FIGS. 3 to 4. The open position) and exposure range can be switched to full size shooting.

Here, unlike the present embodiment, if the operating member 14 is provided at a position other than the rear surface of the lower end portion of the camera, it is used as an input path to the light shielding members 3 and 4 from the light shielding members 3 and 4 to the front, left and right Alternatively, a connecting mechanism extending upward or the like is required. In that case, since the shutter mechanism 2 and the mirror mechanism are located in front of the light blocking members 3 and 4, the cartridge chamber 1c and the spool chamber 1d are located on the left and right, and the pentagonal roof prism 12 is located above the input channel. It is necessary to detour the mechanism from these mechanisms or to shift the arrangement of these mechanisms, which causes the camera to become large. However, if the operation member 14 is provided at the lower end of the camera as in the present embodiment. The space required for the input path to the light shielding members 3 and 4 is small, and the enlargement of the camera can be prevented. Further, with this arrangement, the movement of the operation member 14 can be transmitted to the light shielding plate with an extremely simple structure. Furthermore, since the lower end of the camera is at a position where it is easy to operate while looking through the viewfinder, arranging the operating members in this way provides excellent operability during switching.

Next, a second embodiment shown in FIGS. 8 and 9 will be described. FIG. 8 is an exploded perspective view showing a mounted state of the operation member, and FIG. 9 is a bottom view of the camera. This embodiment differs from the first embodiment only in the mounting state of the operation member 14 'on the camera. That is, in this embodiment, the operation member 14 'is mounted so that it can be operated from the bottom surface side of the camera, not from the back surface side. Even with this configuration, the operation can be performed easily as in the first embodiment, and the size of the camera can be prevented from increasing due to the simplified configuration.

Next, a third embodiment will be described with reference to FIGS. 10 and 11. 10 and 11 are rear views of this mechanism, FIG. 10 showing full-size shooting, and FIG. 11 showing panoramic shooting. In this embodiment, pins 5c and 6c are provided near the tips of the short sides of the drive plates 5 and 6, and springs 16 are attached to both pins 5c and 6c so that the pins 5c and 6c are separated from each other. It is different from the first embodiment in that it is biased to.

According to this structure, both pins 5c and 6c are located closer to the aperture 1a side than the line connecting both fulcrum shafts 7 and 8 in the full size photographing state shown in FIG. The drive plates 5 and 6 are urged in such a manner that their tip ends open to each other, and the light shielding members 3 and 4 are held in a state of being retracted to the outside of the aperture 1a. Further, in the state of FIG. 11 in which the exposure range is restricted to the panoramic photographing state by sliding the operation member 14, both pins 5c and 6c are located on the opposite side of the aperture 1a with respect to the line connecting both fulcrum shafts 7 and 8. As a result, both drive plates 5 and 6 are urged so that their tip portions close to each other, and the light blocking members 3 and 4 are held in a state of covering the upper and lower portions of the exposure range.

Therefore, according to the above configuration, when the operation member 14 is operated between the full-size photographing state and the panoramic photographing state, the springs are kept until the pins 5c and 6c cross the line connecting the fulcrum shafts 7 and 8. Since the light shielding members 3 and 4 try to maintain the original positions by the biasing force of 16, and try to change to the other position when the light shielding members 3 and 4 are crossed, it is possible to prevent the light shielding members 3 and 4 from stopping at an intermediate position. .

[Brief description of drawings]

FIG. 1 is a plan view showing an outline of a basic configuration inside a camera provided with an exposure range switching mechanism according to a first embodiment of the present invention.

FIG. 2 is a front view showing an outline of a basic configuration inside the camera.

FIG. 3 is a rear view showing the exposure range switching mechanism in a full-size shooting state.

FIG. 4 is a rear view showing the exposure range switching mechanism in a panoramic shooting state.

FIG. 5 is a perspective view of this mechanism as seen from the front.

FIG. 6 is an exploded perspective view showing a mounted state of the operation member.

FIG. 7 is a rear view of the camera.

FIG. 8 is an exploded perspective view showing a mounted state of an operation member in the exposure range switching mechanism according to the second embodiment.

FIG. 9 is a bottom view of the camera.

FIG. 10 is a rear view showing the exposure range switching mechanism according to the third embodiment in a full-size shooting state.

FIG. 11 is a rear view showing the exposure range switching mechanism in a panoramic shooting state.

[Explanation of symbols]

1 Camera body 1a Aperture 1b Film rail surface 1c Patrone chamber 1d Spool chamber 2 Shutter unit 3,4 Light shield 3a, 4a
Long hole 5,6 Drive plate 5a Convex part 6a Recessed part 5b, 6b
Slotted hole 5c, 6c Pin 7,8 Support shaft 9 Guide pin 10,11
Drive pin 12 Pentagonal roof prism 13 Pin 14,14 'Operation member 14a Substrate part 14b Projection piece 14c Operation part 15 Back cover 16 Spring

Claims (1)

[Scope of utility model registration request] 1. A light shield movably held by a camera body (1) along the film surface between an exposure range restriction position that covers a part of the exposure range of the film surface and an open position where the entire exposure range is opened. A plate (3, 4), a drive member (5, 6) connected to the light shielding plate (3, 4) and configured to be movable along the film surface, and connected to the drive member (5, 6) and The drive member from the outside
In an exposure range switching mechanism for a camera, which comprises an operating member (14) mounted on the camera body (1) so that the operating members (5, 6) can be operated, the operating member (14) is a lower end of the camera body (1). An exposure range switching mechanism, which is arranged at a position on the back side of the unit.