JPH07209739A - Camera - Google Patents

Abstract

PURPOSE:To obtain a camera which is extremely accurate and whose production cost is low by housing film at a position cut of the optical path of a photographing optical system and inserting the film on an image-formation surface in the optical path of the photographing optical system at the time of exposing the film. CONSTITUTION:When a release is pushed, a lens shutter in a mirror frame 1 is closed first, and then a cartridge 2, a spool chamber 3, a pressing plate and an image plane mask 9 are integrally rotated around a shaft 8 and advance to a specified position in the optical path next. A visual field frame to which the cartridge 2 and the spool chamber 3 advance is retracted backward and the film 5 is set on the image-formation surface. The lens shutter is opened/ closed to perform exposure, and the cartridge 2, the spool chamber 3 and the pressing plate are returned to the specified position, then the lens shutter is opened and the film is wound. A strobe light emitting part 6 can swing up in order to prevent a pink-eye effect and is made distant from a photographing lens 1a. By such constitution, a quick return mirror is fixed in a camera main body, the camera is made extremely accurate and the production cost of the camera is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera, and more particularly to the internal mechanism of the camera.

[0002]

2. Description of the Related Art In a conventional single-lens reflex camera, a film is arranged behind a photographing optical system, and a mirror for reflecting the light passing through the photographing optical system upward is arranged between them. . The light reflected upward can be observed by the photographer by a finder optical system including a pentaprism or the like. The mirror has a quick return structure, and when the film surface is exposed, the light that has retracted upward and passed through the photographing optical system is guided to the film surface.

Further, a part of the quick return mirror is a semi-transmissive mirror, and a sub-mirror for guiding subject light to a light receiving element for autofocusing or exposure control, or the light receiving element itself behind the film, that is, on the film side. Are often arranged.

[0004]

The single-lens reflex camera in the above-mentioned prior art requires a drive mechanism for moving the quick return mirror, but it is necessary to minimize the time lag from the release operation to the exposure. Therefore, the quick return mirror is moved at high speed by the drive mechanism. This drive mechanism needs to meet high requirements such as high speed, high accuracy and durability.
Further, the cost required for manufacturing and assembling also increases with the demand.

Further, in a camera in which a quick return mirror is provided with a sub-mirror, since the sub-mirror guides subject light to a light receiving element when the quick return mirror descends, its positional accuracy must be strictly determined. or,
In order to prevent light leaking from the viewfinder optical system through the semi-transmissive mirror when the quick return mirror is raised, the sub-mirror must be overlapped with the quick return mirror to shield the semi-transmissive mirror portion, and therefore a sub-mirror opening / closing mechanism for that purpose. is necessary.

An object of the present invention is to obtain a camera with high precision and low manufacturing cost by fixing a quick return mirror or the like, which requires precision, to the camera body.

[0007]

In order to achieve the above object, the camera of the present invention comprises a photographing optical system and a finder optical system for observing subject light passing through the photographing optical system. Therefore, the film is housed at a position deviated from the optical path of the photographing optical system, and at the time of exposure of the film, the film is inserted into the image plane in the optical path of the photographing optical system.

[0008]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 to 5 are views for explaining the first embodiment of the present invention, FIG. 1 is a perspective view of the exterior of the camera when retracted, and FIG. 2 is a perspective view of the exterior of the camera when preparing for shooting. FIG. 3 is a perspective view, FIG. 3 is a perspective view of the exterior of the camera at the time of shooting, FIG. 4 is a central sectional view of the camera at the time of collapsing, and FIG. 5 is a central sectional view of the camera at the time of shooting.

First, the preparation for photographing will be described with reference to FIGS. 2 and 4. A field frame 10 is provided on the image-forming surface of the taking lens 1a behind the lens frame 1 which holds the taking lens 1a forming the taking optical system, to show the taking range. Further, a mirror 11 is arranged behind it and reflects the light rays upward. A penta roof prism 12 is provided above it so that the finder field becomes an erect image. An eyepiece lens 13 is provided behind the penta roof prism 12 and constitutes a Kepler finder which is a finder optical system for observing an aerial image by the taking lens 1a.
Here, the finder optical system is not limited to the Kepler finder.

The mirror 11 is partially provided with a half mirror portion, and guides a part of the finder light beam to the rear side of the mirror. AF sensor unit 15 is located behind mirror 11.
Is placed and autofocus is possible. Here, a sub-mirror may be provided on the back surface of the half mirror portion, a part of the light flux may be reflected downward or upward by the sub-mirror, and the AF sensor unit may be provided in front of it.

Above the lens frame 1 and in front of the penta roof prism 12, a strobe light emitting section 6 is provided at a storage position, and a strobe main condenser 7 is arranged on the right side thereof.

Further, a cartridge 2 and two batteries 4 and a spool chamber 3 are arranged from the left under the camera. A pressure plate (not shown) is provided above the film 5 and between the cartridge 2 and the spool chamber 3. In this state, it functions as a light-shielding member that prevents film fogging due to light that has passed through the taking lens 1a or finder light rays. is doing.

The cartridge 2, the spool chamber 3, the pressure plate, and the screen mask (9 in FIG. 3) are integrally rotatably supported by the shaft 8. A motor for feeding and retracting the film is provided behind the mirror 11. In addition to the taking lens 1a, a lens driving mechanism is provided in the lens frame.
A lens shutter (not shown) is arranged.

Next, the operation at the time of photographing will be described with reference to FIGS. When the release is pressed, first the lens frame 1
The lens shutter inside closes. Next, the cartridge 2, the spool chamber 3, the pressure plate, and the screen mask 9 integrally rotate around the shaft 8 and advance to a predetermined position in the optical path. Patrone 2,
When the spool chamber 3 and the like advance, the field frame 10 is retracted rearward, and the film 5 is set on the image plane. Here, since the visual field frame 10 is not related to image formation, the accuracy is comparatively rough.

Next, the lens shutter is opened and closed to perform exposure, and then the cartridge 2, the spool chamber 3, the pressure plate, etc. are returned to the state of FIG. 2, and the lens shutter is opened and the film is wound.

Further, the strobe light emitting section 6 can swing up as indicated by 6'to prevent red eye. As a result, the distance from the optical axis of the taking lens 1a is increased. With the above configuration, the taking lens, the viewfinder optical system, the AF
Since the optical system is fixed, accuracy can be easily achieved.

Further, since there is no quick return mirror, the lens barrel 1 can be easily retracted as shown in FIGS. 1 and 4, and the portability of the camera is increased. The shaft 8 can also be used as a film feeding drive shaft.

The second embodiment of the present invention will be described below.
Although the field frame is movable in the first embodiment, the fixed type is described in the second embodiment. If the field frame is fixed, the film cannot advance to the image forming position of the light beam. Therefore, the film is set on the subject side of the image plane. However, since the amount of deviation is the same every time, after the release, the AF drive is moved by a predetermined amount to move the focus surface for correction.

According to the structure of the second embodiment, the number of movable parts is reduced, the reliability is increased, and the cost is kept low. A third embodiment of the present invention will be described with reference to FIGS. Here, FIG. 6 is a perspective view of the exterior of the camera at the time of preparation for shooting, FIG. 7 is a perspective view of the exterior of the camera at the time of shooting, and FIG. 8 is a top view of the exterior of the camera of the third embodiment. . The finder and AF have the same structure as in the first embodiment.

The cartridge 2, the spool chamber 3, the pressure plate (not shown), and the screen mask 9 are movable as a unit, and are exposed by sliding from above just before the field frame 10. The pressure plate also serves to block the back light from the viewfinder.

The LS and the film advance / retreat are performed as in the first embodiment, and the focus correction is performed as in the second embodiment. Along with this, the battery 4 and the main capacitor 7 are moved after the cartridge 2 and after the spool chamber 3, respectively.

According to the above construction, a high-precision camera can be easily achieved as in the second embodiment, and the film is inserted by sliding, so that the fb of the taking lens can be shortened. It is easy to reduce the size and cost of the lens.

Further, in this embodiment, the battery and the main capacitor are arranged in order to make them as compact as possible, but the battery and the main capacitor may be arranged on the left side of the cartridge to form the grip portion in order to improve grip. good.

A fourth embodiment of the present invention will be described below with reference to FIGS. 9 to 11. Here, FIG. 9 is a perspective view of the exterior of the camera, FIG. 10 is a central sectional view of the camera at the time of preparation for photographing, and FIG. 11 is a central sectional view of the camera at the time of photographing.

In this embodiment, the position of the shaft for rotating the film of the first embodiment is changed. Accordingly, the strobe 6 is moved above the spool chamber 3, the main condenser 7 is moved to the rear of the cartridge 2, the motor 14 is moved to the front of the cartridge 2, and the battery 4 is moved to the rear of the mirror 11 (see FIG. 9).

On the other hand, the cartridge 2, the spool chamber 3, and the film 5 are arranged so as to hold the lens frame 1. The finder, AF, shutter, etc. are the same as in the first embodiment. Although rotation is performed in this example, it is also possible to move it non-linearly by using a cam, a link or the like. In FIG. 9, 2'shows the arrangement of the cartridge 2 at the time of shooting preparation, 3'shows the arrangement of the spool chamber 3 at the shooting preparation, and 5'shows the arrangement of the film 5 at the shooting preparation.

Compared to the first embodiment, the fourth embodiment has a smaller space due to the locus of movement of the cartridge 2, spool chamber 3, etc., and can be miniaturized. Further, it is possible to shorten the fb of the lens, which leads to downsizing of the lens (see FIG. 11).

Further, like the first embodiment, the film is normally retracted, so that it can be retracted (see FIG. 10).
In this example, the film is retracted to the bottom, but it may be on the top.

If a convex lens system is detachably provided between the taking lens and the field frame, the height of the light beam of the finder can be reduced and the mirror prism and the like can be downsized. This is also possible for other embodiments. Naturally, the lens retracts when the film is inserted.

A fifth embodiment of the present invention will be described below with reference to FIGS. 12 and 13. In the above-described first to fourth embodiments, the film is moved by utilizing the small size and light weight of the film and the cartridge by the small cartridge, but in the present embodiment, only the film is moved.

12 and 13, (a) respectively.
Is a front view and (b) is a central sectional view, showing only the film portion and the lens portion. Others are the same as the fourth embodiment. Figure 1
2 shows the time of shooting preparation, and FIG. 13 shows the time of shooting.

When the cartridge 2 is set in the camera, the film 5 is automatically fed out, and the film guide 21,
It is guided by 22 and set as shown in FIG. 12 (the guides of the cartridge outlet and the spool chamber inlet are not shown). That is, the slack portion is formed by the film guide 21.

At the time of photographing, as shown in FIG. 13, the pressure plate 23, the film guide 22, and the screen mask 9 are set in the optical path while sandwiching the film. At this time, the film guide 2
1 retracts to the bottom of the camera.

According to the fifth embodiment, although the space for the film slack is necessary, the cartridge 2 and the spool chamber 3 are required.
It is not necessary to move the camera, the space of the locus due to the movement is small, and the camera can be downsized. Also, the fourth
Similarly to the embodiment, the lens fb can be small. Also, since the inertia of the moving object is small, high speed driving is easy.

Further, as shown in FIG. 14A, when the film is inserted, the pressure plate 23 is not moved integrally, and the film 5 is moved to the position shown in FIG.
It is possible to further shorten fb by deforming as shown in (b). This also applies to the fourth embodiment.

In each of the above-mentioned embodiments, for example, JP-A-5-165166 and JP-A-5-257.
As described in Japanese Patent No. 234, by using a film patrone that is smaller than the conventional film patrone, compared to the case of using the conventional film patrone,
The driving force required to drive the film, film cartridge, or the like is at least good, and the size of the driving mechanism itself can be reduced, so that a camera smaller than a conventional camera can be realized.

That is, the film patrone described in the above-mentioned JP-A-5-165166 and JP-A-5-257234 is the size of a conventional film patrone (φ24 mm, the area of one exposed portion is about 860 mm ² ).
On the other hand, it is a small film cartridge having a diameter of approximately 14 to 20 mm and an area of one exposed portion of approximately 350 mm ^2. By applying these film cartridges and films to the camera as in the above embodiment, the layout inside the camera can be improved. The degree of freedom is increased, so that the drive mechanism required for inserting the film can be downsized and the required drive force can be reduced.

According to the embodiment of the present invention described in detail above,
The following configuration can be obtained. That is, (1) comprises a photographic optical system and a finder optical system for observing subject light that has passed through this photographic optical system, and stores the film at a position outside the optical path of the photographic optical system, A camera characterized in that, when the film is exposed, the film is inserted into an image forming plane in an optical path of the photographing optical system, and shutter means is provided in the photographing optical system. (2) A photographic optical system and a finder optical system for observing subject light that has passed through the photographic optical system.The film is housed at a position outside the optical path of the photographic optical system, and A camera characterized in that the film is inserted into an image forming surface in the optical path of the photographing optical system at the time of exposure to, and the deviation amount between the image forming surface and the film surface is corrected. (3) A photographic optical system and a finder optical system for observing subject light that has passed through the photographic optical system, and the film is housed at a position outside the optical path of the photographic optical system. At the time of exposure to light, the film, the film cartridge containing the film, and the film spool that winds the film pulled out from the film cartridge are moved, and the film is inserted into the image plane in the optical path of the photographing optical system. A camera characterized by: (4) A photographic optical system and a finder optical system for observing the subject light that has passed through the photographic optical system, and the film is housed at a position outside the optical path of the photographic optical system. In a camera that inserts the film into an image forming surface in the optical path of the photographing optical system during exposure to a film, a film pressure plate arranged behind the film when inserting the film into the image forming surface is used. A camera used as a light blocking member when retracted from the image plane. (5) A photographic optical system and a finder optical system for observing subject light that has passed through the photographic optical system, and the film is housed at a position outside the optical path of the photographic optical system. In a camera that inserts the film into the image forming plane in the optical path of the photographing optical system during exposure to light, the film is inserted into the image forming plane by inserting the film into the optical axis of the photographing optical system and the film. A camera characterized by being moved in a direction perpendicular to the feeding direction. (6) A photographic optical system and a finder optical system for observing subject light that has passed through the photographic optical system, and the film is stored at a position outside the optical path of the photographic optical system. In a camera that inserts the film into the image plane in the optical path of the photographing optical system at the time of exposure to the film, the film is inserted into the image plane by rotating the film around an axis along the feeding direction. A camera characterized by being performed. (7) A photographic optical system and a finder optical system for observing the subject light that has passed through the photographic optical system, and the film is housed at a position outside the optical path of the photographic optical system. At the time of exposure to the film cartridge containing the film and a film spool for winding the film drawn from the film cartridge, the drawn film has a slack,
A camera, characterized in that the pulled-out film is inserted into an image forming plane in an optical path of the photographing optical system.

[0039]

As described in detail above, in the first aspect of the invention, the film is housed at a position deviated from the optical path of the photographing optical system, and the film is placed in the optical path of the photographing optical system when the film is exposed. Since it is configured to be inserted into the image forming plane of, the high-speed and high-accuracy driving mechanism required for driving the optical element such as the mirror is not required, so that a camera with high accuracy and low manufacturing cost can be obtained. You can

Further, in the second invention, in the first invention, the film is housed in a small film cartridge, and the film is pulled out from the small film cartridge along the bottom surface of the camera. The film can be configured to be movable back and forth with respect to the image plane without increasing the size of the camera body.

[Brief description of drawings]

FIG. 1 is an external perspective view of a camera of the first embodiment when retracted.

FIG. 2 is a perspective view showing the exterior of the camera when preparing to shoot in the first embodiment.

FIG. 3 is an external perspective view of the camera at the time of shooting in the first embodiment.

FIG. 4 is a central sectional view of the camera of the first embodiment when retracted.

FIG. 5 is a central cross-sectional view of the camera at the time of shooting in the first embodiment.

FIG. 6 is a perspective view showing the exterior of the camera when preparing to shoot in the third embodiment.

FIG. 7 is an external perspective view of the camera at the time of shooting in the third embodiment.

FIG. 8 is a transparent top view of the exterior of the camera of the third embodiment.

FIG. 9 is an external perspective view of the camera of the fourth embodiment.

FIG. 10 is a central sectional view of the camera of the fourth embodiment at the time of preparation for shooting.

FIG. 11 is a central cross-sectional view of the camera during photographing according to the fourth embodiment.

FIG. 12 is a diagram showing the arrangement of camera elements at the time of shooting preparation of the fifth embodiment.

FIG. 13 is a diagram showing the arrangement of camera elements at the time of shooting in the fifth embodiment.

FIG. 14 is a diagram showing a modification of the fifth embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Mirror frame, 1a ... Photographing lens, 2 ... Patrone, 3 ... Spool chamber, 4 ... Battery, 5 ... Film, 6 ... Strobe light emission part, 7 ... Main condenser, 8 ... Axis, 9 ... Screen mask,
Reference numeral 10 ... Field frame, 11 ... Mirror, 12 ... Penta-Dach prism, 13 ... Eyepiece, 14 ... Motor, 15 ... AF sensor unit.

Claims (2)

[Claims] 1. A photographic optical system, and a finder optical system for observing subject light that has passed through the photographic optical system. The film is housed at a position outside the optical path of the photographic optical system, and A camera, characterized in that the film is inserted into an image plane in an optical path of the photographing optical system when the film is exposed. 2. The camera according to claim 1, wherein the film is housed in a small film cartridge and is pulled out from the small film cartridge along the bottom surface of the camera.