JPH0439641A - Interchangeable single lens reflex camera for photographing special picture - Google Patents

Abstract

PURPOSE:To eliminate the projection part of a pentagonal prism on the upper surface of a camera and to make an entire form compact by respectively making the upper surface and the bottom surface of a camera main body nearly coincident to the heights of the upper edge and the lower edge of a mount seat plate for an interchangeable lens. CONSTITUTION:The condenser lens 25 of a range-finding module 23 is set lower than the lower edge of an exposing area by a special picture frame 11 and upper than the lower edge of the exposure feasible area of a film itself. Therefore, a sub mirror 22 and a main mirror 21 are moved backward, so that the positions of a focusing plate 30 and the pentagonal prism 31 are made lower. Since the upper surface and the bottom surface of the camera are respectively made nearly coincident to the heights of the upper edge and the lower edge of the mount seat plate 6 for the interchangeable lens without increasing the height of the camera, the projection part of the prism 31 is eliminated and the entire form is made compact.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is directed to a normal type film in which a 35 mm film is loaded, a full-frame lens is detachably attached, and the film is fed laterally. In a single-lens reflex camera with interchangeable lenses, in particular, at least a portion of the exposed area of the film itself in the vertical direction is partitioned so as not to be exposed.
For example, it relates to a camera that has the function of shooting on a special screen such as a panoramic screen.

``Prior art'' Conventionally, there have been single-lens reflex cameras with interchangeable lenses that use 35 mm film and are equipped with full-frame lenses to shoot standard screen sizes. The pentaprism part that makes up the finder optical system usually protrudes like a chevron from the top of the camera.

In addition, some cameras of this type have an autofocus function, and their focus detection device is, for example, T
A phase difference detection method is known in TL photometry. by the way,
As illustrated in FIG. 11, this type of focus detection device passes through a camera lens (not shown) to a main mirror 2
The distance measuring module 23 is provided with a distance measuring module 23 into which light from a subject is incident after passing through the sub-mirror 22 and being refracted by the sub-mirror 22. This distance measurement module 23 includes a condenser lens 25 disposed near a film equivalent surface (image surface) 24 that forms a subject image, a separator lens 26 that divides this image,
It is composed of an image sensor 27 made of a COD or the like which re-forms the image through the separator lens 26 and generates a focal position signal. In the example shown in FIG. 11, a mirror 28 is interposed between the condenser lens 25 and the separator lens 26 to bend the optical axis.

In addition, in the front region corresponding to the upper and lower edges of the standard screen frame 10 that partitions the exposed range of the film F, specifically, below the optical axis center 111 from the photographing lens, this optical axis The exposed area of normal film between the center 111 and the line 112 passing through the lower edge of the standard screen frame 10 (
A fixing member that blocks light is not placed in the area corresponding to distance C). This is because there is a fixed member that blocks light.
This is because part of the film will not be exposed. Therefore, the distance measuring module 23 including the condenser lens 25 is not placed closer than the distance C from the optical axis center 111.

On the other hand, if the film storage (tjA surface) 24 is close to the condenser lens 25, the diameter of the condenser lens 25 can be made small (about the size of the image surface), but the film equivalent surface 2
The larger the distance between the condenser lens 25 and the condenser lens 25, the more the light spreads, so the condenser lens 25 needs to have a larger diameter.

Therefore, in order to make the diameter of the condenser lens 25, which must be placed outside (below) the line 112 at a distance MC from the optical axis center 111 as described above, as small as possible, the film equivalent surface 24 should be placed on the line 112. It will be placed as close as possible.

[Problems to be Solved by the Invention] By the way, the sub-mirror 22 is provided in front of the film F on the optical axis 111 from the photographing lens, and as a matter of course, the distance N1 between the sub-mirror 22 and the film F is ,
The distance between the sub-mirror 22 and the film equivalent surface 24 is made equal to the distance between the sub-mirror 22 and the film equivalent surface 24. Therefore, the sub-mirror 22 cannot be placed closer to the film F side than the distance MC. As a result, this becomes one of the constraints in downsizing the dimensional structure of the camera in the longitudinal and height directions, and as a result, as mentioned above, it is necessary to eliminate the protrusion of the pentaprism part from the top surface of the camera. was considered difficult.

In addition, by using regular 35mm film and using a special screen frame that blocks light from exposing at least part of the film's exposure area in the vertical direction, you can shoot special screens, such as panoramas with large horizontal and medium dimensions. Although it has been proposed to perform photographing, no particular consideration has been given to miniaturizing the configuration or eliminating the protruding portion of the pentaprism.

The present invention solves the above-mentioned problems, and is intended to improve the protrusion of the pentaprism on the top of the camera in a single-lens reflex camera that can be equipped with a full-frame lens and that uses ordinary 35 mm film to take special screen shots. The purpose is to eliminate this and make it more compact.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a mount seat plate on which a full-size lens is removably mounted, and a mount seat plate on which a 35 mm film is loaded and the film is horizontally mounted. In a single-lens reflex camera that has a feeding mechanism and a special screen frame that shields at least part of the exposure range in the vertical direction for standard screen shooting with the same film, the top and bottom surfaces of the camera body are connected to the mount seat plate, respectively. Approximately the height of the top and bottom of -
This is what I did.

[Function] According to the above configuration, the height of the camera body can be made almost the same as the diameter of the interchangeable lens, and the pentaprism part does not protrude from the top of the body, making the top surface of the camera flat. .

[Embodiment] Hereinafter, a single-lens reflex camera for special screen photography according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 3 and 5.

Figure 1 shows the appearance with the lens section removed, Figure 2 shows the side cross section, Figure 3 shows the arrangement of each part as seen from the front of the camera, and Figure 5 shows the arrangement of each component as seen from the front of the camera.
The figures show the circuit configurations.

In FIG. 1, the camera is a single-lens reflex camera that is loaded with a normal 35 mm film and has an m-structure for feeding the film in the lateral direction. A top cover 2, a bottom cover 3, a back cover 4, etc. are attached to the main body 1.
A finder eyepiece 5 is provided on the back, and a mount seat plate 6 for detachably attaching an interchangeable lens is provided on the front.

As can be seen from the illustration, although this camera is a single-lens reflex camera, the upper cover 2 and lower cover 3 are designed to have a height approximately equal to the height of the upper and lower ends of the mount seat plate 6 so that the pentaprism portion does not protrude upward. They are made equal, and the overall height is also low. A main switch 7, a release button 8, a display panel 9, etc. are provided on the top surface.

In FIG. 2, inside the main body 1 is a focus detection device (
A distance measuring module (hereinafter referred to as a distance measuring module) 23 is installed with its longitudinal direction facing the front and back direction of the camera, and is installed in a position facing the film surface so that at least a part of its exposure area in the vertical direction is not exposed. A special screen frame 11 is formed to block light and partition. A shutter unit 12 is arranged in front of this special screen frame 11. In addition, 1
3a and 13b are film rails that slide on the upper and lower edges of the film to guide film feeding, and 14 is a film holding plate.

A main mirror 21 and a sub-mirror 22, which can be rotated to open and close relative to the film exposure surface, are provided on the optical path (center optical axis 111) that enters through the photographic lens, and the light refracted by the sub-mirror 22 is used for the measurement described above. Distance module 23
incident on . The distance measuring module 23 includes a condenser lens 25 disposed near a film or the like that forms an image of the incident light, a separator lens 26 that divides this image,
The image pickup device 27 is composed of a CCD or the like that re-forms the image through the separator lens 26. Note that 28 is a module mirror for bending the optical path. The condenser lens 25 is installed below the lower edge of the exposure area formed by the special screen frame and above the lower edge of the exposure area of the film itself in the height direction of the camera.

The upper part of the inside of the main body consists of the finder optical system.
A focus plate 30 and a pentaprism 31 are provided, and the light reflected by the main mirror 21 reaches the finder eyepiece 5 through these. Further, in order to perform in-finder photometry, a light receiving element 32 is provided so as to be able to photometer the light reflected by the pentaprism 31. This is because it is a special screen frame 11 that partially blocks light from the upper and lower parts of the exposure area or the standard screen frame, and as described above, the sub mirror 22 can be moved backward, and therefore the main mirror 21 can be moved backward. , the positions of the focusing plate 3° and the pentaprism 31 can be lowered (in this example, they are mounted with their front sides tilted downward), thereby increasing the height of the camera. This eliminates the need for the pentaprism 31 portion to protrude upward, and furthermore, the height of the upper cover 2 can be made equal to the height of the upper end of the mount seat plate 6.

In the space below the ranging module 23 inside the main body,
A distance measuring (AP) motor 35 and a charging motor 36 for shutters and the like are arranged. The reason why such an arrangement is possible is that the condenser lens 25 of the ranging module 23
As mentioned above, this is because the film is placed above the lower edge of the exposed area of the film itself. This allows effective use of space and makes it possible to make the camera more compact in the height direction.

The arrangement of various parts is as shown in FIG.

In FIG. 3, 33 is a film cartridge chamber, 34 is a spool for winding the exposed film, 37 is a film winding/rewinding motor, 38 is a rewinding mechanism consisting of a series of a plurality of gears, 39 is a winding mechanism, Reference numeral 40 indicates an AP drive mechanism 41 which is a charging mechanism, and reference numeral 50 indicates a control circuit. The distance measuring module 23 is capable of measuring distances at a plurality of points, for example, three points in the left and right (horizontal) directions. This distance measurement module 23
Below the APP motor 35 and charging motor 36,
AF drive mechanism 40 charging mechanism 41 on both sides
is located.

FIG. 10 shows the arrangement of the condenser lens 25 described above. The distance from the optical axis center 111 to the special screen frame 11 is A, the distance to the condenser lens 25 is H,
The distance to the film uniform portion 24 is H', and the normal film F
The setting is made so that the relationship A<H<C is satisfied, where C is the distance to the exposure range line 112. Note that in order to make the condenser lens 25 small in diameter, it is necessary to bring the lens 25 close to the film equivalent surface 24 as described above, so H and H' are set to approximate values. Moreover, the distance iii between the sub-mirror 22 and the film F! d is made equal to the distance d between the sub-mirror 22 and the film equivalent surface 24.

The reason for setting the above relationship is explained below.
If the distance MH is smaller than the distance iwA, the condenser lens 25 will kick the light passing through the photographic lens during exposure, and if the distance MH is larger than the distance MC,
Since the sub-mirror 22 is separated from the film F surface by more than NC, unnecessary space increases. Thus, compared to the conventional one, the sub-mirror 22 can be placed closer to the rear of the camera, that is, closer to the film Fflll, and the distance measuring module 23 can be moved upwards, making it possible to reduce the front and rear and height dimensions of the camera. can.

FIG. 4 shows a modification of the component arrangement in the first embodiment.

In this example, the distance measurement module 23 is arranged in the vertical (vertical) direction, and the AF motor 35 and charge motor 36 are placed in front of it.
are placed. The distance measuring module 23 used here does not require the module mirror 28 described above, and the configuration is simplified accordingly. Note that a light receiving element 42 is provided for photometry on the film surface when using a flash.

FIG. 5 shows the control circuit configuration of the first embodiment, and shows a control device (hereinafter referred to as CPU) 5 made of a microcomputer or the like.
1 takes in various information and controls the entire camera. The data setting section 52 is for inputting various setting data to the CPtJ51.

The switch S1 is a photometry/distance measurement switch that is turned on when the release button 8 is pressed halfway, and causes the camera to proceed to an interrupt process for the photometry/distance measurement sequence. The switch S2 is a release switch that is turned on when the release button 8 is fully pressed. A
The F main light receiver 53 inputs a distance measurement signal from the image sensor 27 of the distance measurement module 23 to the CPU 51 . The aperture encoder 54 generates a monitor signal for controlling the motor drive of the aperture up to the photographing aperture value. Lens control encoder 55
generates a monitor signal for AP sub-control of the lens.

A display section 57 having a display panel 9, a DX code reading section 58 for reading film information, and a photometry section 59 having the aforementioned light receiving elements 32 and 42 are connected to the CPU 51 via a data bus 56. A flash section 61 and a lens ROM 62 are connected via an interface 60. Also, via the driver 63, a shutter front curtain magnet Mgl, a rear curtain magnet Mg2, a release magnet Mg3, an aperture stop magnet M
g4, an AP motor 35, a shutter charge motor 36, and a film winding/rewinding motor 37 are connected.

6 to 9 show a second embodiment. This example is
This embodiment differs from the first embodiment in that the flash is built into the camera body and the lens drive section is provided in the interchangeable lens section.

As shown in FIG. 6, the built-in flash device 61 is arranged so that its light emitting section faces the front of the camera. Further, as shown in FIG. 7, a strobe main motor is provided on the lower side of the distance measuring module 23 in the main body 1, instead of the AP motor etc. in the case of the first embodiment shown in FIG. A capacitor 65, a pre-emission capacitor 66 for so-called red-eye countermeasures, is provided. The arrangement of the condenser lens 25 of the ranging module 23 is the same as that described in FIG. 10 for the first embodiment.

The arrangement of various parts is as shown in FIG. 8, with a main capacitor 65 and a preliminary light emission capacitor 66 arranged below the distance measuring module 23. 67 is a charging/rewinding motor, 68 is a film winding motor, 69 is a shutter charging mechanism consisting of a series of a plurality of gears, and 70 is a winding mechanism.

The circuit configuration is as shown in FIG. 9, and in addition to the camera CPU 71 on the camera body side, a lens CPU 73 is also provided in the interchangeable lens section 72. When the interchangeable lens part 72 is mounted on the mount seat plate 6, the mutual electrical contact terminals are connected. Then, the camera CPU 71 and lens CPU
73 will be connected via the data bus 56 and interface 74. In the figure, 75 is an interface, 76 is a control circuit, and in the lens section 72, 7
7. 78 is a driver, 79 is a pulse motor for aperture control,
80 is a lens drive motor, and 81 is a zoom encoder. In addition, in the flash unit, 85 is a booster circuit;
86 is a light emission start switch, 87 is a light emission trigger circuit, 8
8 is a xenon tube, 89 is a light emission stop switch, and 90 is a charge monitor circuit. Note that the same components as described above are given the same numbers.

Note that the present invention is not limited to the configuration of the above-described embodiments, and various modifications are possible. For example, for the film exposure area, in addition to the special screen frame 11 that partitions the panoramic screen described above, any shape that blocks light from at least a portion of the screen in the vertical direction can be applied.

Further, the condenser lens 25 may be any condensing lens, and a Fresnel lens or the like may be used.

[Effects of the Invention] As described above, according to the present invention, there is provided a single-lens reflex camera with interchangeable lenses that uses a full-frame lens and a regular 35 mm film for special screen photography, and the viewfinder optical The system's pentaprism is lowered, and the top and bottom surfaces of the camera are approximately at the same height as the top and bottom of the interchangeable lens mount seat plate, respectively, so there is no protruding part of the pentaprism, making the overall shape more compact. In addition, even if the camera is accidentally dropped, the impact of the drop will not be concentrated on the protruding part of the pentaprism, making it more durable. Become something.

[Brief explanation of drawings]

1(a), (b), and (c) are respectively a front view, a back view, a top view, and a bottom view of a camera according to a first embodiment of the present invention, and FIG. 2 is a vertical sectional view of the same camera, and FIG. 4 is a diagram showing a partial modification of FIG. 2, FIG. 5 is a circuit configuration diagram of the same camera, and FIG. 6 is a camera according to the second embodiment. 7 is a cross-sectional view of the same camera, FIG. 8 is a layout diagram of each component, FIG. 9 is a circuit configuration diagram, FIG. 10 is a diagram explaining the arrangement of the ranging module, and FIG. 11 FIG. 2 is a diagram illustrating a conventional arrangement. 2...Top cover, 3...Bottom cover, 6...Mount seat plate, 11...Special screen frame, 21...Mirror, 22
...Submirror, 23...Distance measurement module (focus detection device) 25...Condenser lens, 26...Separator lens, 27...Image sensor, 31...Penta prism, F...Film . Applicant Minolta Kamep Co., Ltd. Agent
Patent Attorney Yasuo Itaya Figure 4 (a) Figure (b) Figure (d) Figure 4

Claims (1)

[Claims] (1) A mount seat plate on which a full-frame lens is removably attached, a mechanism for loading 35mm film and feeding the film in the horizontal direction, and an exposure range for standard screen shooting with the same film. A single-lens reflex camera having a special screen frame that shields at least part of the vertical direction, characterized in that the top and bottom surfaces of the camera body are made to substantially match the heights of the top and bottom ends of the mount seat plate, respectively. A single-lens reflex camera with interchangeable lenses for special screen photography.