JPH0619013A - Image frame size switching camera - Google Patents

Abstract

PURPOSE:To provide an image frame size switching camera in which dust, etc., is surely prevented from entering into a camera main body. CONSTITUTION:The switching operation part of an image frame size switching mechanism 13 housed in the camera main body 1 is exposed to a back cover 6 side through a guide hole in a long hole state formed on the camera main body 1 on the periphery of an aperture II in this image frame size switching camera. The guide hole is formed on the bottom of a groove in the light shielding rib 10 of the camera main body 1 along the rib 10, and the switching operation part is constituted of an operation part main body engaged to freely slide on the rib 10 in a state where it covers the guide hole from the back cover 6 side, an engaging projection which is inserted through the guide hole from the operation part main body, extended and engaged with the mechanism part of the image frame size switching mechanism 13, and an operation end provided on the back cover 6 side of the operation part main body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention switches between a normal shooting mode corresponding to a normal screen size and a pseudo panoramic shooting mode corresponding to a horizontally long screen size obtained by cutting the upper and lower sides of the normal screen size. The present invention relates to a screen size switching camera that is freely configured.

[0002]

2. Description of the Related Art FIGS. 5 and 6 show a screen size switching mechanism of a conventional screen size switching camera. In both figures, the camera body is viewed from the rear with a cover and a back cover removed. It is explanatory drawing of operation. As shown in both figures, the screen size switching mechanism 51 is provided in the camera body 52, and a screen size switching plate 54 facing the aperture 53, moving means 55 for moving the screen size switching plate 54 up and down, and the camera body 52. And a guide hole 56 which is an operation portion of the moving means 55. The screen size switching plate 54 has openings 5 that define the panorama size.
It is formed in a frame shape having 7 and is arranged in the vicinity of the front of the aperture 53. An engaging hole 58 extending in the horizontal direction is formed in the upper part of the screen size switching plate 54, and the screen size switching plate 54 has a moving means 55 at this portion.
, Is guided by a guide (not shown), and is moved up and down by the moving means 55.

The moving means 55 has a switching lever 59 whose one end is engaged with the screen size switching plate 54 and whose other end is rotatably fixed to the camera body 52, and a spring 60 which urges the switching lever 59 to rotate. It consists of and. The switching lever 59 is slidably engaged with the engagement hole 58 of the screen size switching plate 54 via the pin 61 at the tip end, and the camera body 52 is provided with a long hole 62 extending substantially vertically in the lower middle portion. It faces the guide hole 56 formed in. The guide hole 56 is disposed above the aperture 53 and extends in the horizontal direction. For example, by inserting a pen tip or the like into the long hole 62 of the switching lever 59 from the guide hole 56 and sliding it in the left-right direction. The switching lever 59 can be rotated.

Therefore, when the portion of the long hole 62 of the switching lever 59 along the guide hole 56 is slid to the right as shown in FIG. 5, the switching lever 59 is rotated upward and at the same time, the screen size switching plate. When 54 moves up and out of the aperture 53, and slides to the left as shown in FIG. 6, the switching lever 59 is rotated downward, and at the same time, the screen size switching plate 54 moves down and the aperture 53 moves.
Then, the screen size is switched.

[0005]

As described above, in the conventional screen size switching camera, the screen size switching mechanism 51 is used.
The back cover side and the inside of the camera body 52 are communicated with each other at the guide hole 56, which is a switching operation portion of, and there is a possibility that dust, dust, or the like may enter the inside of the camera body 52 from the guide hole 56. .

The present invention has been made in view of the above problems, and an object of the present invention is to provide a screen size switching camera capable of reliably preventing dust and the like from entering the inside of the camera body.

[0007]

In order to achieve the above object, according to the present invention, a switching operation portion of a screen size switching mechanism housed in the camera body is a long hole formed in the camera body around the periphery of the aperture. A screen size switching camera exposed on the case back side through a guide hole, wherein the guide hole is formed in the groove bottom of the light shielding rib along the light shielding rib of the camera body,
The switching operation unit is an operation unit main body that slidably engages with the light shielding rib with the guide hole covered from the back cover side, and a mechanism part of the screen size switching mechanism that extends from the operation unit main body through the guide hole. It is characterized in that it is composed of an engaging projection to be engaged and an operation end provided on the case back side of the operation section main body.

[0008]

[Function] When a pen tip or the like is applied to the operation end of the switching operation unit and the operation unit body is slid using the light shielding rib as a guide, the engaging projection of the switching operation unit is slid along the guide hole, The mechanical part of the screen size switching mechanism is switched. In this case, if the guide hole is formed in the groove bottom of the light-shielding rib, the operation portion and the film are not separated from each other, the film is not damaged by the switching operation, and there is no fear of light leakage to the film. In addition, if the operation section body of the switching operation section is slidably guided by the light shielding ribs with the guide hole covered from the back cover side, the guide hole will not be exposed even when the back cover is opened. Since it is not exposed to the outside and the light shielding rib can be used as a guide member, it is not necessary to separately provide a guide member.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A screen size switching camera according to an embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a side view of a camera cut in a pseudo panoramic shooting mode, FIG. 2 is a side view of an enlarged part of a screen size switching mechanism, and FIG. 3 is a rear view of the camera opened in a normal shooting mode. 4 is a rear view of the camera in the pseudo panoramic shooting mode with the back cover opened.
This camera is a so-called panoramic camera modified based on a 35 mm compact camera, and can switch between a normal shooting mode with a screen size of 24 mm x 36 mm and a pseudo panoramic shooting mode with a screen size of 13 mm x 36 mm. ing. This switching operation is performed when the film is filled.

As shown in FIG. 1, this camera includes a front photographic lens (combined lens) 2 in the front part on the optical axis L of the camera body 1 and a rear photographic lens in the rear lens barrel on the optical axis L. (Combined lens) 3. On the other hand, the rear of the camera body 1 is positioned so as to be orthogonal to the optical axis L and defines an aperture 4 for defining the screen size in the normal photographing mode, a pressure plate 5 for pressing the film F facing the aperture 4, and the pressure plate 5. And a back cover 6 for pressing the film to the film F side. A dark box-shaped lens barrel 7 is provided between the photographic lens 2 and the film F, and a flange back can be taken between them.

Further, an upper chassis 8 and a lower chassis 9 are provided in contact with the upper front part and the lower front part of the pressure plate 5, respectively. The upper chassis 8 has an upper edge of the aperture 4 and an upper light shielding rib 10. Is formed, the lower chassis 9
The lower edge of the aperture 4 and the lower light-shielding rib 11 are formed in the. The upper light-shielding ribs 10 and the lower light-shielding ribs 11 are fitted into the upper and lower inner surfaces of the back cover 6 so as to mesh with each other, so that light leakage from the closed gap between the back cover 6 and the main body case 12 can be completely blocked. There is. Also, the upper chassis 8
A screen size switching mechanism 13 is incorporated in the front space of the device. In addition, by this arrangement configuration,
The screen size switching mechanism 13 and the film F are separated from each other and do not come into contact with each other.

2 to 4 show a screen size switching mechanism. The screen size switching mechanism 13 has a screen size switching plate 21 which faces the front space of the aperture 4 from above.
And moving means 2 for moving the screen size switching plate 21 up and down.
2, a switching knob 23 (switching operation portion) for operating the moving means 22, and a guide hole 2 formed in the upper chassis 8.
It is composed of 4 and. The screen size switching plate 21 is formed in a rectangular frame shape having an opening 25 for defining a pseudo panorama size, and is configured to be movable between a switching position facing the aperture 4 and a retracted position escaping above. Has been done. Although not shown, this movement is guided in the vertical direction by a guide member, and at the switching position moved downward, the photographing light is exposed to a pseudo-panoramic size defined by the opening 25 of the screen size switching plate 21, and moved upward. At the position, the photographing light is in an exposure state of a normal size defined by the aperture 4. Then, the vertical movement is performed by the moving means 2 connected to the screen size switching plate 21 via the engagement pin 26 attached to the upper portion of the screen size switching plate 21.
2 is performed.

The moving means 22 includes a switching lever 27 pivotally supported on the upper chassis 8 and a switching lever 27.
And a spring 28 for urging the rotation of the switching lever 27, and the tip of the switching lever 27 is connected to the screen size switching plate 21. The switching lever 27 is rotatably attached to the upper chassis 8 by a retaining screw 29 screwed from the rear at the tail end, and pivots in the vertical direction to move the screen size switching plate 21 to the switching position and the retracted position. Move up and down between and. In order to align the rotation of the switching lever 27 and the vertical movement of the screen size switching plate 21 in a link manner, a first elongated hole 30 is formed at the tip of the switching lever 27. The engagement pin 26 of the screen size switching plate 21 is slidably engaged with the hole 30.

Further, in the upper middle part of the switching lever 27,
A winding-type spring 28 having one end supported by the upper chassis 8 is attached. The spring 28 has a virtual line connecting the center of the support portion on the side of the upper chassis 8 and the center of rotation of the switching lever 27, that is, the center of the retaining screw 29 as a boundary (dead point), and the switching lever 27 is located below the spring. When it is located at, it is biased downward, and when it is located at top, it is biased upward. Thus, the switching position and the retracted position of the screen size switching plate 21 are stably held in a biased state. On the other hand, a second elongated hole 31 extending in the radial direction with respect to the center of rotation of the switching lever 27 is formed in the lower middle portion of the switching lever 27, and the switching knob 23 is engaged with the second elongated hole 31. It is supposed to meet.

The switching knob 23 can be operated with the back cover 6 opened, and is provided on the switching lever 27 and the knob body 32 (operating portion body) slidably engaged with the upper light shielding rib 10. It is composed of an engaging projection 33 to be engaged and an operation hole 34 (operation end) formed at the end of the knob body 32. The knob body 32 is formed in the shape of a thin square rod, and is exposed to the side of the back cover 6 so that the groove 1 of the upper light-shielding rib 10 is exposed.
It is attached to the groove bottom of 0a. The knob body 32 slides in the left-right direction between the normal photographing mode position and the pseudo panoramic photographing mode position, using the groove 10a of the upper light shielding rib 10 as a guide.

The engaging projection 33 penetrates the guide hole 24 formed in the upper chassis 8 and slidably engages with the second long groove 31 of the switching lever 27. A retaining collar 35 is provided at an intermediate portion of the engaging protrusion 33 so that the engaging protrusion 33 does not fall out of the guide hole 24. The guide hole 24 is the groove 1 of the upper light shielding rib 10.
It is formed at the bottom of the groove 0a and guides the switching movement of the switching knob 23 together with the groove 10a. The operation hole 34 is formed by rounding the end portion of the knob body 32, and a pen tip or the like is inserted into this portion so that the switching knob 23 can be slid.

Next, the switching operation of the screen size switching mechanism 13 will be described with reference to FIGS. 3 and 4. In FIG. 3, the switching knob 23 is in the normal photographing mode position moved to the right, and the switching lever 27 is in the position rotated upward. Similarly, the screen size switching plate 21 also moves upward and is in the retracted position. In this case, the screen size switching plate 21 has completely escaped from the aperture 4, and the shooting light causes the screen size 2 on the film 3 by the aperture 4.
A subject image of 4 mm × 36 mm is formed.

Then, from this state, when the switching knob 23 is slid to the left and moved to the pseudo panoramic photographing mode position, the switching lever 27 is rotated downward, and at the same time, the screen size switching plate 21 is moved downward. Aperture 4
Is set to the switching position facing the. At this switching position, the photographing light forms a subject image having a screen size of 13 mm × 36 mm on the film 3 through the opening 25 of the screen size switching plate 21. Conversely, if the switching knob 23 is operated to the right, the pseudo panoramic shooting mode is switched to the normal shooting mode in the reverse order.

As described above, in this embodiment, the switching knob 2
The mode can be easily switched between the pseudo panoramic shooting mode and the normal shooting mode simply by sliding 3 on a protrusion such as a pen tip. In this case, since the switching knob 23 is mounted in the groove 10a of the upper light shielding rib 10 and slid so as to cover the guide hole 24,
The guide hole 24 that communicates the inside of the camera body 1 with the outside of the back cover 6 side is not exposed to the outside even when the back cover 6 is opened, and not only light leakage but also dust or the like enters the camera body. Can be effectively prevented. Moreover, since the upper light-shielding rib 10 can be used as a slide guide for the switching knob 23, it is possible to provide a structure in which mode switching can be smoothly performed without particularly increasing the number of parts.

In this embodiment, the 35 mm camera has been described, but it goes without saying that it can be applied to so-called half size cameras and the like.

[0021]

As described above, according to the present invention, the switching operation section for operating the screen size switching mechanism covers the guide hole that communicates the inside of the camera body with the outside of the case back side from the case back side. Since it is provided and is slidable on the light-shielding rib, damage to the film and light leakage can be effectively prevented, and dust can effectively enter the camera body even when the back cover is opened. It can be prevented. Moreover, the light shielding rib can be used as a guide member, and the operability of the switching operation unit can be improved without increasing the number of parts.

[Brief description of drawings]

FIG. 1 is a cut side view of a camera of an embodiment in a pseudo panoramic shooting mode state.

FIG. 2 is a side view of an enlarged portion cut of the screen size switching mechanism according to the embodiment.

FIG. 3 is a rear view of the camera of the embodiment in the normal shooting mode with the back cover opened.

FIG. 4 is a rear view of the camera of the embodiment in the pseudo panoramic shooting mode with the back cover opened.

FIG. 5 is a rear view of the conventional camera in a normal shooting mode with the back cover opened.

FIG. 6 is a rear view of the conventional camera in the pseudo panoramic shooting mode with the back cover opened.

[Explanation of symbols]

 1 Camera Main Body 4 Aperture 6 Back Cover 10 Upper Light-Shielding Rib 13 Screen Size Switching Mechanism 23 Switching Knob 24 Guide Hole 32 Knob Main Body 33 Engagement Protrusion 34 Operation Hole

Claims (1)

[Claims] 1. A screen size switching mechanism in which a switching operation section of a screen size switching mechanism housed in the camera body is exposed to the back cover side through an elongated guide hole formed in the camera body at the periphery of the aperture. In the camera, the guide hole is formed in the groove bottom of the light shielding rib along the light shielding rib of the camera body, and the switching operation part is provided on the light shielding rib with the guide hole covered from the back cover side. An operation part main body that slidably engages, an engagement projection that extends from the operation part main body through the guide hole and engages with a mechanical part of the screen size switching mechanism, and a back cover side of the operation part main body. A screen size switching camera characterized by being configured with an operating end provided.