JPH08248492A - Camera and shutter block - Google Patents

Abstract

PURPOSE: To provide a camera and a shutter block capable of preventing the deformation of a film positioning rail and a frame aperture even if stress is applied. CONSTITUTION: A camera 200 is provided with a supporting plate 22, the camera body 23 provided with a film cartridge chamber 236 on one side and a spool chamber 237 on the other side, a mirror box 24, the shutter block 25 and a body side bayonet mount 29. The camera body 23 and the mirror box 24 are fixed on the supporting plate 22 and the mirror box 24 is fixed on the camera body 23. Further, inner rails 261a and 261b and outer rails 262a and 262b are provided on the rear of the shutter block 25 and it is fixed on the mirror box 24.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a camera and a shutter block.

[0002]

2. Description of the Related Art Generally, an interchangeable lens single lens reflex camera (S
The LR) camera has an internal skeleton, or chassis. Such a chassis is generally called a camera body, and has a film cartridge chamber, a spool chamber,
The unitary structure integrally includes a guide rail and a rear plate having a frame aperture that regulates the exposure area of the photographic film. The camera body is typically constructed of die cast aluminum or other metal to maintain its optical alignment and to provide sufficient rigidity to support large lenses. However, if the camera body is made of metal, the weight becomes heavy.

In recent years, the performance of engineering plastic materials has improved, and these plastics have been gradually used as materials for manufacturing various parts of cameras. Then, in terms of weight reduction and cost reduction, it is possible to form the camera body with plastic, but since the camera body withstands a large mechanical load and needs a reference surface for alignment,
Metals are still used as the material.

FIG. 1 is an exploded perspective view showing a conventional SLR camera, and FIG. 2 is a sectional side view (longitudinal sectional view) showing the conventional SLR camera. As shown in FIG. 1, the main components of the conventional camera 100 are a camera body 13 and a support plate 12.
And the mirror box 14.

The support plate 12 is a screw hole 1 of the support plate 12.
21a, 121b and 121c and the screw holes 134a, 134b and 134c of the camera body 13,
It is fixed to the bottom of the camera body 13 by screws 116a, 116b and 116c.

The shutter block 15 has mounting tabs 151a and 151b formed on the upper portion thereof, and the screw holes 152a and 152b of the mounting tabs 151a and 151b and the screw hole 1 of the camera body 13 are provided.
It is fixed to the upper part of the camera body 13 by screws 118a and 118b via 33a and 133b. Further, the shutter block 15 is fixed to the lower portion of the camera body 13 by a screw 118c via the screw hole 152c of the shutter block 15 and the screw hole 133c of the camera body 13.

As shown in FIGS. 1 and 2, the shutter block 15 includes a front frame plate and a rear frame plate, a plurality of shutter blades 153b, and a shutter blade chamber 1 containing the shutter blades 153b.
53 and a drive mechanism (not shown) for driving these shutter blades 153b. The shutter blade chamber 153 is arranged between the front frame plate and the rear frame plate.

The shutter block 15 controls exposure by driving the shutter blades 153b when taking a picture. An opening 153a is formed behind the shutter block 15, and the opening 1
An opening corresponding to 53a is formed in front of the shutter block 15, and the body side bayonet mount 19 is provided.
Incident light that has passed through a taking lens (not shown) attached to the photographic film reaches the photographic film.

The camera body 13 has upper mounting blocks 131a and 131b formed integrally. On the other hand, the mirror box 14 has mounting blocks 141a and 141b that are integrally formed. The mirror box 14 includes screw holes 132a and 132 of the upper mounting blocks 131a and 131b.
It is fixed to the upper part of the original camera 13 by screws 119a and 119b (above the shutter block 15) via b and the screw holes 142a and 142b of the mounting blocks 141a and 141b.

The bottom of the mirror box 14 has screw holes 121d and 121e formed in the support plate 12,
It is fixed to the support plate 12 by screws 117a and 117b via the screw holes 142c and 142d of the mirror box 14. The support plate 12 is provided with a tripod socket 115 having an internal thread for attaching a tripod or other support device.

The camera body 13 of this conventional camera 100
The film cartridge chamber 136 and the spool chamber 1
37, and a thin back plate 13 disposed between the film cartridge chamber 136 and the spool chamber 137.
And 5 are formed. The back plate 135 has a camera 1
A frame aperture 135a for restricting the exposure area of one frame (frame) of the photographic film in 00 is formed.

For the photographic film, a film cartridge (patrone) containing the photographic film is mounted in the film cartridge chamber 136, and the photographic film is pulled to the take-up spool (not shown) in the spool chamber 137 through the frame aperture 135a. When taken out, the camera 100 is loaded.

In order to stabilize the position and conveyance of the photographic film, the back plate 135 of the camera body 13 has a pair of inner rails 161a and 161b integrally formed and a pair of outer rails 162a and 162b integrally formed. Is provided. When taking a picture or winding up the photographic film, the photographic film is set on the inner rails 161a and 161.
It is flattened by b and is guided between the outer rails 162a, 162b. A cover portion (decorative plate) 122 shown by a dotted line in FIG. 2 is provided on the top, front, and bottom of the camera 100.

As shown in FIGS. 1 and 2, the camera 10
A body side bayonet mount 19 is provided in front of 0 (on the photographing lens side), and is fixed to the mirror box 14 by a screw 19a. A lens-side bayonet mount is provided on a lens barrel of an interchangeable photographing lens (not shown), and the lens-side bayonet mount is detachable from the body-side bayonet mount 19.

The mirror box 14 is provided with a quick return mirror having a main mirror 111 and a sub mirror 112 shown by a dotted line in FIG. The quick return mirror is swingably supported by a mirror box 14 and swings between a photographing position and an observation position.

The position indicated by the dotted line in FIG. 2 is the observation position, and the incident light is the main mirror 11 which is a half mirror.
It is divided into reflected light and transmitted light by 1. This reflected light is guided upward toward the focusing plate, the pentamirror and the finder (not shown). In addition, the transmitted light is
Sub-mirror 1 for automatic focus detection system (not shown)
It is reflected by 12.

The quick return mirror moves to its photographing position when a release switch (not shown) is turned on. That is, the main mirror 111 and the sub mirror 112 bounce up and become parallel to the focusing plate and reach the shooting position, whereby the incident light reaches the shutter block 15. After this, the shutter block 15 is activated and the shutter is opened to expose the photographic film.

As shown in FIG. 2, the back cover 17 is adapted to be closed at the rear of the camera body 13. Grooves 13a and 13b are provided on the rear side of the camera body 13,
When the back lid 17 is closed, the upper and lower rims of the back lid 17 are in the groove 1
3a and 13b are fitted to each other, which blocks light from entering the rear part of the camera 100. Case back 1
7 (inside the camera 100 when the back cover 17 is closed), a photographic film is attached to the outer rails 162a and 16a.
The pressure plate 18 is elastically supported by the support 18a so as to be pressed against the inner rails 161a and 161b between the pressure plate 18 and 2b.

Since the back plate 135 of the camera body 13 is influenced by the stress applied from the outside, the camera body 13 is conventionally made of metal in order to reduce the influence. When the back plate 135 is distorted by the stress applied from the outside, the frame aperture 135a, the inner rails 161a and 161b, and the outer rails 162a and 162b are also distorted, and the image quality is deteriorated.

For example, when the conventional camera 100 is attached to a tripod, a large bending stress from the outside is directly transmitted from the tripod to the back plate 135 via the screw 116b, for example. At that time, the back plate 135 warps, as a result, the flatness of the photographic film regulated by the inner rails 161a and 161b is impaired, the position of the photographic film regulated by the outer rails 162a and 162b is displaced, and the frame aperture 135a. The image regulated by is deteriorated.

The camera body 13 of the conventional camera 100 having the inner rails 161a and 161b, the outer rails 162a and 162b and the frame aperture 135a thus formed on the back plate 135 is easily affected by a force applied from the outside. . In particular, when the camera body 13 is made of resin, there is a problem that it is more susceptible to distortion when a force is applied from the outside.

[0022]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a camera and a shutter block which can prevent deformation of a rail for positioning a film and a frame aperture even when stress is applied to the camera from the outside.

[0023]

The above objects are achieved by the present invention described in (1) to (18) below.

(1) A camera body provided between the film cartridge chamber and the spool chamber and provided with a plate having an opening formed therein, and a mirror box fixed to the camera body and swingably supporting a mirror. A shutter block including a frame aperture formed to regulate an exposure area of the photographic film and at least a pair of rails for positioning the photographic film, the shutter block including the mirror box. Alternatively, the camera is fixed to the camera body, and the frame aperture and the rail are configured to be located in the opening, respectively.

(2) A camera body provided between the film cartridge chamber and the spool chamber and having a plate having an opening formed therein, a frame aperture formed to regulate the exposure area of the photographic film, and A shutter block having at least a pair of rails for positioning a photographic film, the shutter block being fixed to the camera body, and the frame aperture and the rail respectively in the opening. A camera that is configured to be located at.

(3) The camera according to (2), further comprising a mirror box fixed to the camera body and swingably supporting a mirror.

(4) The camera according to (3), wherein the shutter block is fixed to the mirror box.

(5) The camera described in (1), (3) or (4), which has a support plate fixed to each of the camera body and the mirror box.

(6) The camera according to (5), wherein the support plate is provided with a tripod socket in which a female screw for attaching the tripod to the camera is cut.

(7) The rail comprises a pair of inner rails for flattening the photographic film, and a pair of outer rails located outside the inner rail for guiding the photographic film. Yes (1) to (6)
The camera described in any of.

(8) The shutter block includes a front frame plate located at the front, a rear frame plate located at the rear, a shutter blade chamber located between the front frame plate and the rear frame plate, and The camera according to any one of (1) to (7) above, further comprising a plurality of shutter blades held in a shutter blade chamber, wherein the front frame plate and / or the rear frame plate is made of metal.

(9) The rail is formed or fixed to a film guide plate provided on the rear frame plate, and the film guide plate is located in the opening. camera.

(10) A camera having a camera body provided between the film cartridge chamber and the spool chamber and having a plate having an opening formed therein, and a shutter block having a film guide plate located in the opening. The film guide plate is formed to have substantially the same size as the opening, and has a surface that is substantially flush with the surface of the plate. A frame aperture formed to regulate a region, a pair of inner rails for flattening the photographic film, and a pair of outer rails located outside the inner rail and for guiding the photographic film. A camera characterized by having.

(11) The shutter block is located at the front frame plate at the front and at the rear.
A rear frame plate provided with the film guide plate, a shutter blade chamber located between the front frame plate and the rear frame plate, and a plurality of shutter blades held in the shutter blade chamber, The front frame plate and / or the rear frame plate is made of metal (10)
The camera described in.

(12) The above-mentioned (10) or (11), which has a mirror box fixed to the camera body and swingably supporting a mirror, and the shutter block is fixed to the mirror box. camera.

(13) A support plate fixed to each of the camera body and the mirror box is provided, and the support plate is provided with a tripod socket in which a female screw for attaching the tripod to the camera is cut. The camera according to (12) above.

(14) The camera according to any one of (1) to (13), wherein at least the plate of the camera body is made of resin.

(15) A shutter block for a camera, comprising a shutter and a rear frame plate located behind the shutter and provided with a film guide plate, wherein the film guide plate is in the traveling direction of the photographic film. And a pair of inner rails for contacting the surface of the photographic film and flattening the photographic film, and extending in the running direction of the photographic film, contacting the edges of the photographic film and guiding the photographic film. A shutter block, comprising: a pair of outer rails for effecting the above operation; and a frame aperture formed on the film guide plate between the pair of inner rails to regulate a maximum exposure area of the photographic film.

(16) The shutter block according to (15), further comprising a front frame plate located in front of the shutter, wherein the front frame plate and / or the rear frame plate is made of metal.

(17) The shutter block according to the above (15) or (16), which has means for attaching the shutter block to a mirror box that swingably supports a mirror.

(18) The height of the outer rail in the thickness direction of the photographic film is higher than the height of the inner rail in the thickness direction of the photographic film.
Shutter block described in any of.

[0042]

BEST MODE FOR CARRYING OUT THE INVENTION The camera and shutter block of the present invention will be described below in detail with reference to the preferred embodiments shown in the accompanying drawings. FIG. 3 is an exploded perspective view showing an embodiment of the camera of the present invention, and FIG. 4 is a sectional side view (longitudinal sectional view) showing an embodiment of the camera of the present invention.

As shown in these figures, the camera 200
Is an interchangeable lens single-lens reflex (SLR) camera having an autofocus type TTL finder. As shown in FIG. 3, main components of the camera 200 are a camera body 23, a support plate 22, a shutter block 25, and a mirror box (mirror box) 24.

The support plate 22 has screw holes 2 of the support plate 22.
21a, 221b and 221c and the screw holes 234a, 234b and 234c of the camera body 23,
It is fixed to the bottom of the camera body 23 by screws 216a, 216b and 216c.

The shutter block 25 has mounting tabs 251a and 251b formed on the upper portion thereof, and the screw holes 252a and 252b of the mounting tabs 251a and 251b and the screw hole 2 of the mirror box are formed.
It is fixed to the upper part of the mirror box 24 by screws 218a and 218b via 42e and 242f. Further, the shutter block 25 is fixed to the lower portion of the mirror box 24 by a screw 218c via a screw hole 252c of the shutter block 25 and a screw hole 242g of the mirror box 24.

The camera body 23 has upper mounting blocks 231a and 231b which are integrally formed. On the other hand, the mirror box 24 has mounting blocks 241a and 241b that are integrally formed. The mirror box 24 includes screw holes 232a and 232 of the upper mounting blocks 231a and 231b.
It is fixed to the upper part of the camera body 23 by screws 219a and 219b (above the shutter block 25) via b and the screw holes 242a and 242b of the mounting blocks 241a and 241b.

The support plate 22 has a female screw threaded tripod socket 2 for attaching a tripod or other supporting device.
15 are provided. A male screw on the side of a tripod or other supporting device is screwed into the tripod socket 215. The screws 216b, 219a, and 219b have a distance between the tripod socket 215 and the screw 216b (which connects the support plate 22 and the camera body 23) to the tripod socket 215 (the mirror box 24 and the camera body 23, respectively). And the screws 219a and 219b are connected to each other.

The bottom of the mirror box 24 has a support plate 22.
Screw holes 221d and 221e of the mirror box 2
4 through the screw holes 242c and 242d.
It is fixed to the support plate 22 by 17a and 217b. The screws 216b, 217a, and 217b have a distance between the tripod socket 215 and the screw 216b (which connects the support plate 22 and the camera body 23) to the tripod socket 215 (support plate 22 and the mirror box 2).
4) and screws 217a and 217b.

The camera body 23 comprises a film cartridge chamber 236, a spool chamber 237, and a thin back plate (plate) 235 arranged between the film cartridge chamber 236 and the spool chamber 237. A rectangular film guide plate 256 formed on a shutter block 25, which will be described later, is inserted into the back plate 235, and a rectangular opening (window) 23 is formed to face the film surface side.
8 are formed. The opening 238 and the film guide plate 256 are formed to have substantially the same size. Such a camera body 23 is integrally formed of, for example, a hard resin.

FIG. 5 is a rear view showing the shutter block 25 attached to the mirror box 24. As shown in the figure, the shutter block 25 of the camera 200
The rear frame plate 255 of the film guide plate 2
56 is integrally formed.

The film guide plate 256 has a frame aperture 253a for controlling the maximum exposure area (exposure area) of a frame (one frame of photographic film) of a silver salt photographic film (photographic film). Further, the film guide plate 256 extends in the traveling direction of the photographic film (left and right direction in FIG. 5) and is formed as a pair of inner rails 261 that are integrally formed.
a and 261b and a pair of outer rails 262a and 262b that are integrally formed and extend in the running direction of the photographic film (left and right direction in FIG. 5) are provided, and these stabilize the position and conveyance of the film.

The outer rails 262a and 262b are arranged outside the inner rails 261a and 261b. The height of the outer rails 262a, 262b in the thickness direction of the photographic film is higher than the height of the inner rails 261a, 261b in the thickness direction of the photographic film. This height difference is equal to or greater than the thickness of the photographic film.

Also, a pair of outer rails 262a, 262b
Are each divided into three. The frame aperture 253a is arranged between the inner rails 261a and 261b.

As shown in FIGS. 3 and 4, the shutter block 25 is a so-called focal plane shutter block, and includes a front frame plate 254 and a rear frame plate 255, a plurality of shutter blades 253b, and these shutter blades 253b.
The shutter blade chamber 253 accommodates (holds) the shutter blade chamber 253, and a drive mechanism (not shown) for driving these shutter blades 253.

The shutter blade chamber 253 is arranged between the front frame plate 254 and the rear frame plate 255. In this case, at least one of the front frame plate 254 and the rear frame plate 255 is made of metal. Further, an opening is formed in the front frame plate 254 corresponding to the frame aperture 253a of the film guide plate 256. The shutter block 25 controls exposure by driving the shutter blades 253b when taking a photograph.

The shutter block 25 is not directly fixed to the camera body 23. That is, the shutter block 25 is fixed to the camera body 23 via the mirror box 24.

As shown in FIG. 4, in the camera 200, the area between the outer rails 262a and 262b (film traveling path).
In, the film guide plate 256 is fitted into the opening 238 of the camera body 23 so that the surface of the film guide plate 256 on the photographic film side and the surface of the back plate 235 on the photographic film side are substantially on the same plane. Can be assembled together.

That is, as shown in FIG. 6, the outer rail 2
In the region between 62a and 262b, the edge portion 235a facing the opening 238 of the back plate 235 and the end portion 256a of the film guide plate 256 are configured so that there is no step.
As a result, when the photographic film runs, the edge 2
35a and the edge portion 256a are prevented from rubbing and damaging the emulsion side surface (exposed surface) of the photographic film.

As shown in FIG. 4, the frame aperture 253a, the inner rails 261a and 261b, and the outer rails 262a and 262b are located inside the opening 238, respectively.

The inner rails 261a and 261b and the outer rails 262a and 262b slightly project rearward from the same plane of the film guide plate 256 and the back plate 235, respectively.

During photographing and film feeding, the photographic film is regulated by the inner rails 261a and 261b so as to be flat and guided between the outer rails 262a and 262b. That is, the inner rails 261a and 261b are
It contacts the surface of the photographic film and regulates the position of the photographic film in the front-back direction and the curvature in the width direction of the photographic film. The outer rails 262a and 262b contact the edges of the photographic film, regulate the position of the photographic film in the width direction, and guide the photographic film so that the photographic film can be fed smoothly.

FIG. 6 is a rear view showing the camera body 23 with the shutter block 25 attached to the camera body 23. As shown in the figure, the photographic film is
Film cartridge that stores it (Patrone)
Is mounted in the film cartridge chamber 236,
The photographic film is loaded into the camera 200 by pulling it through the film guide plate 256 and the frame aperture 253a to the take-up spool 237a in the spool chamber 237.

As shown in FIG. 4, the cover portion (decorative plate) 222 shown by the dotted line in FIG.
It is provided on the front and bottom. As shown in FIGS. 3 and 4, in front of the camera 200 (on the side of the photographing lens),
The body side bayonet mount 29 is provided,
It is fixed to the mirror box 24 by screws 29a. A lens-side bayonet mount is provided on a lens barrel of an interchangeable photographing lens (not shown), and the lens-side bayonet mount is detachable from the body-side bayonet mount 29.

The mirror box 24 is provided with a quick return mirror having a main mirror 211 and a sub mirror 212 shown by a dotted line in FIG. The quick return mirror is swingably supported by a mirror box 24 and swings between a photographing position and an observation position.

The position shown by the dotted line in FIG. 4 is the observation position, and the incident light is the main mirror 21 which is a half mirror.
It is divided into reflected light and transmitted light by 1. This reflected light is guided upward toward the focusing plate, the pentamirror and the finder (not shown). In addition, the transmitted light is
Sub-mirror 2 for automatic focus detection system (not shown)
It is reflected by 12.

The quick return mirror moves to its photographing position when a release switch (not shown) is turned on. That is, the main mirror 211 and the sub mirror 212 bounce up and become parallel to the focus plate and reach the shooting position, whereby the incident light reaches the shutter block 25. After this, the shutter block 25 is activated and the shutter is opened to expose the photographic film.

As shown in FIG. 4 and FIG.
Are to be closed at the rear of the camera body 23. The back cover 27 has an upper rim 271 and a lower rim 272 that are provided upright along the periphery thereof, that is, along the edge portion. Further, grooves 23a and 23b are provided on the rear side of the camera body 23, and when the case back 27 is closed, the upper rim 271 fits in the groove 23a and the lower rim 272 fits in the groove 23b. This prevents light from entering the rear part (inside) of the camera 200.

As shown in FIG. 4, inside the back cover 27 (inside the camera 200 when the back cover 27 is closed),
In order to press the photographic film against the inner rails 261a, 261b between the outer rails 262a, 262b, the pressure plate 28 is elastically supported by a support 28a made of an elastic material. The pressure plate 28 is formed in a shape and a size included in the opening 238.

When the back cover 27 is closed, the support 28a
The pressure plate 28 is pressed to the left in FIG. 4 by the pressure plate 28.
Is crimped to the outer rails 262a and 262b. The height of the inner rails 261a and 261b is the same as that of the outer rails 262a and 261,
Since it is lower than the height of 2b, the pressure plate 28 and the film guide plate 2
A gap is formed with 56.

The photographic film is located in this gap, and the inner rails 261a and 261b and the pressure plate 28 regulate the position in the front-rear direction (horizontal direction in FIG. 4), and the curvature is corrected to be flat. Further, the position of the photographic film in the width direction (vertical direction in FIG. 4) is regulated by the outer rails 262a and 262b.

According to the camera 200 of this embodiment, since the shutter block 25 has the frame aperture 253a for restricting the exposure area of the frame of the photographic film, the camera body 23 has a similar frame aperture. There is no need to provide it separately. Therefore, the camera 2
It is possible to reduce the number of working steps when manufacturing 00, and productivity is improved.

When external stress is applied to the support plate 22 and the camera body 23, the distortion due to the stress is transmitted through the camera body 23 or the support plate 22 and the mirror box 2.
4 is transmitted. However, in the camera 200, the frame aperture 253a, the inner rail 261a,
261b and outer rails 262a and 262b are provided on the shutter block 25, so that the camera body 23
Or from the support plate 22 to the frame aperture 253a,
Inner rails 261a, 261b and outer rails 262a,
It is possible to prevent the stress from being directly transmitted to 262b.

In this case, since the mirror box 24 is formed in a box shape and therefore has a relatively high strength, the distortion transmitted to the mirror box 24 is the shutter block 2.
Little is transmitted to 5. Since at least one of the front frame plate 254 and the rear frame plate 255 of the shutter block 25 is made of metal, the shutter block 25 has high strength and is hard to be deformed.

Therefore, as compared with the conventional camera 100, the frame aperture 253a and the inner rails 261a and 261b.
The outer rails 262a and 262b are less likely to be deformed.

When the camera 200 is attached to a tripod (not shown), the stud provided on the tripod is attached to the support plate 22.
It is screwed into the tripod socket 215. The transmission path of the stress from the tripod socket 215 passes through the support plate 22, the mirror box 24, and the shutter block 25, and the inner rails 261a and 261b, the outer rail 262a,
It reaches 262b.

Therefore, even when the tripod stud is excessively tightened or another force is applied when the camera 200 is attached to the tripod, the frame aperture 253a is provided.
And inner rails 261a and 261b, outer rail 262
a, 262b are substantially isolated from strain stress. Therefore, the film guide portion (inner rails 261a, 261b,
Outer rails 262a, 262b, frame aperture 25
3a) is stable, and the photographic film can be positioned and guided properly and surely.

As described above, in the camera 200, since it is not necessary to consider the problem of the distortion force as in the conventional camera, all or part of the camera body 23 is made of resin, and the camera body 23 and the camera 200 are made lighter. can do.

In the above-described embodiment, the shutter block 25 is preferably fixed to the mirror box 24. That is, the shutter block 25 is indirectly fixed to the camera body 23.

However, in the present invention, the shutter block 25 may be directly fixed to the camera body 23. Also in this case, the frame aperture 253a, the inner rails 261a and 261b, and the outer rails 262a and 262b.
With respect to the resistance to the stress from the outside, the stress is not directly transmitted to the frame aperture 253a, the inner rails 261a and 261b, and the outer rails 262a and 262b.
Higher than the resistance of conventional cameras. Although the camera and shutter block of the present invention have been described above based on the illustrated configuration example, the present invention is not limited to this.

[0080]

As described above, according to the camera and shutter block of the present invention, the rail for positioning the film and the frame aperture are prevented from being deformed even when the camera is stressed, or the rail is more rail-shaped than the conventional one. The deformation of the frame aperture can be reduced.
Therefore, the flange back dimension can be stabilized, and thus the photographic film can be properly aligned.

Further, when the shutter block is fixed to the mirror box, particularly when the front frame plate and / or the rear frame plate of the shutter block is made of metal, it is more reliable.
It is possible to prevent deformation of the rail for positioning the film and the frame aperture. Further, when at least the plate of the camera body is made of resin, the weight of the camera can be reduced and the productivity is improved.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a conventional SLR camera.

FIG. 2 is a sectional side view (longitudinal sectional view) showing a conventional SLR camera.

FIG. 3 is an exploded perspective view showing an embodiment of the camera of the present invention.

FIG. 4 is a sectional side view (longitudinal sectional view) showing an embodiment of the camera of the present invention.

FIG. 5 is a rear view showing the shutter block attached to the mirror box in the present invention.

FIG. 6 is a rear view showing the camera body with the shutter block attached to the camera body in the present invention.

[Explanation of symbols]

 12 support plate 13 camera body 13a, 13b groove 14 mirror box 15 shutter block 17 back cover 18 pressure plate 18a support 19 body side bayonet mount 19a screw 100 camera 111 main mirror 112 sub-mirror 115 tripod socket 116a to 116c screw 117a, 117b screw 118a -118c screw 119a, 119b screw 121a-121e screw hole 122 cover part 131a, 131b upper mounting block 132a, 132b screw hole 133a, 133b screw hole 134a-134c screw hole 135 back plate 135a frame aperture 136 film cartridge chamber 137 spool chamber 141a , 141b Mounting block 142a to 142d Screw hole 151a, 151b Mounting tab 1 2a to 152c Screw hole 153 Shutter blade chamber 153a Opening 153b Shutter blade 161a, 161b Inner rail 162a, 162b Outer rail 22 Support plate 23 Camera body 23a, 23b Groove 24 Mirror box 25 Shutter block 27 Back cover 28 Pressure plate 28a Support 29 Body side Bayonet mount 29a Screw 200 Camera 211 Main mirror 212 Sub mirror 215 Tripod socket 216a to 216c Screw 217a, 217b Screw 218a to 218c Screw 219a, 219b Screw 221a to 221e Screw hole 222 Cover part 231a, 231b Upper mounting block 232a, 232b Screw hole 234a to 234c Screw hole 235 Back plate 235a Edge 236 Film cartridge chamber 237 Spool 238 opening 241a, 241b mounting block 242a-242g screw hole 251a, 251b mounting tab 252a-252c screw hole 253 shutter blade chamber 253a frame aperture 253b shutter blade 254 front frame plate 255 back frame plate 256 film guide plate 256a end portion 256a Inner rail 262a, 262b Outer rail 271 Upper rim 272 Lower rim

Claims (18)

[Claims] 1. A camera body provided between a film cartridge chamber and a spool chamber, the camera body including a plate having an opening formed therein, and a mirror box fixed to the camera body and swingably supporting a mirror, A frame aperture formed to regulate the exposure area of the photographic film, and a shutter block including at least a pair of rails for positioning the photographic film, wherein the shutter block is the mirror box or A camera fixed to the camera body, wherein the frame aperture and the rail are arranged in the opening, respectively. 2. A camera body provided with a plate having an opening formed between a film cartridge chamber and a spool chamber, a frame aperture formed to regulate an exposure area of a photographic film, and the photograph. A shutter block including at least a pair of rails for positioning the film, the shutter block is fixed to the camera body, the frame aperture and the rail,
Each of the cameras is configured to be located within the opening. 3. The camera according to claim 2, further comprising a mirror box fixed to the camera body and swingably supporting a mirror. 4. The camera according to claim 3, wherein the shutter block is fixed to the mirror box. 5. A support plate fixed to each of the camera body and the mirror box.
Or the camera described in 4. 6. The camera according to claim 5, wherein the support plate is provided with a tripod socket in which a female screw for attaching the tripod to the camera is cut. 7. The rail comprises a pair of inner rails for flattening the photographic film, and a pair of outer rails located outside the inner rail for guiding the photographic film. The camera according to any one of claims 1 to 6, wherein: 8. The shutter block includes a front frame plate located in the front, a rear frame plate located in the rear, a shutter blade chamber located between the front frame plate and the rear frame plate, and the shutter. 8. A plurality of shutter blades held in a blade chamber, wherein the front frame plate and / or the rear frame plate are made of metal.
The camera described in any of. 9. The camera according to claim 8, wherein the rail is formed or fixed to a film guide plate provided on the rear frame plate, and the film guide plate is located in the opening. 10. A camera having a camera body provided between a film cartridge chamber and a spool chamber, the plate having an opening formed therein, and a shutter block having a film guide plate located in the opening. The film guide plate is formed to have substantially the same size as the opening and has a surface that is substantially flush with the surface of the plate. A frame aperture formed for regulating the photographic film, a pair of inner rails for flattening the photographic film, and a pair of outer rails located outside the inner rail for guiding the photographic film. A camera having. 11. The shutter block includes a front frame plate located in front, a rear frame plate located rearward and provided with the film guide plate, and between the front frame plate and the rear frame plate. The camera according to claim 10, further comprising a shutter blade chamber located therein, and a plurality of shutter blades held in the shutter blade chamber, wherein the front frame plate and / or the rear frame plate is made of metal. 12. The camera according to claim 10, further comprising a mirror box fixed to the camera body and swingably supporting a mirror, and the shutter block being fixed to the mirror box. 13. A support plate fixed to each of the camera body and the mirror box, wherein the support plate is provided with a tripod socket in which a female screw for attaching the tripod to the camera is cut. The camera according to claim 12, wherein the camera. 14. The camera according to claim 1, wherein at least the plate of the camera body is made of resin. 15. A shutter block for a camera, comprising a shutter and a rear frame plate located behind the shutter and provided with a film guide plate, wherein the film guide plate is arranged in a running direction of a photographic film. A pair of inner rails extending and contacting the surface of the photographic film for flattening the photographic film, extending in the running direction of the photographic film, contacting the edges of the photographic film, and guiding the photographic film A shutter block having a pair of outer rails for controlling the maximum exposure area of the photographic film formed on the film guide plate between the pair of inner rails. 16. The shutter block according to claim 15, further comprising a front frame plate located in front of the shutter, wherein the front frame plate and / or the rear frame plate is made of metal. 17. The shutter block according to claim 15, further comprising means for attaching the shutter block to a mirror box that swingably supports a mirror. 18. The shutter block according to claim 15, wherein a height of the outer rail in a thickness direction of the photographic film is higher than a height of the inner rail in a thickness direction of the photographic film.