JP2000187270A - Camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a camera compact, reduce its cost, and improve the accident detecting ability. SOLUTION: This camera is provided with photographic picture frame switching members 2, 3 and 4 for switching a photographic picture frame, finder visual field switching members 5 and 6 for switching a finder visual field according to the photographic picture frame, and an operating member 1 for performing switching operations, and when the switching operation is executed by using the operating member, the photographic picture frame switching member is driven to switch the picture frame, and the finder visual field switching member is driven so as to switch the visual field through the photographic picture frame switching member.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera having a shooting screen frame switching mechanism, and more particularly to a camera having a focal plane shutter and a shooting screen frame switching mechanism.

[0002]

2. Description of the Related Art Some cameras have a photographing screen frame switching mechanism for switching a photographing screen between a full size and a panoramic size. Such a camera is mechanically operated in accordance with the photographing screen size switching. A finder field switching member for switching the finder field is often provided.

As such a camera, for example, as disclosed in Japanese Patent Application Laid-Open No. Hei 8-136982, an operation member for operating a photographing screen frame switching member is compared with a photographing screen frame switching member. The finder field-of-view switching member has been driven by separate independent linkage mechanisms.

[0004]

However, when the photographing screen frame switching member and the finder visual field switching member are driven by separate independent linkage mechanisms as described above, the following disadvantages arise. Was.

[0005] Space efficiency is poor, making compactness difficult.

The number of components is large and the cost is high.

Lack of accident detection capability. Specifically, even if the photographing screen frame switching member does not operate, the finder visual field switching member operates alone.

In view of the above, the present invention provides a camera which can be made compact and low in cost, can improve the accident detection capability, and can also improve the contact property. It is an object.

[0009]

In order to achieve the above object, in the camera of the present invention, a photographing frame is switched (for example, a full photographing frame corresponding to 135 format film and a panoramic photographing frame are switched). Switching), a finder visual field switching member for switching the finder visual field according to the photographic screen frame, and an operation member to be switched. When the operation member is switched, photographing is performed. The screen frame switching member is switched and driven, and the finder visual field switching member is switched and driven via the photographing screen frame switching member.

That is, the photographing screen frame switching member is switched and driven by the switching operation force of the operating member or the driving force of the driving source operated by the switching operation of the operating member, and the finder view field switching is performed by the driven photographing screen frame switching member. By adopting a configuration in which the members are switched and driven, the number of components is reduced as compared with a case where separate drive mechanisms are provided for switching of the shooting screen frame and switching of the finder visual field, so that compactness and cost reduction can be achieved. I have. further,
When the shooting screen frame switching member operates, the finder field of view switching member always operates, so it is possible to reliably check the switching of the shooting screen frame with the viewfinder, while if the shooting screen frame switching member does not operate Since the finder field switching member does not operate, the accident detection capability can be improved.

In the case where an opening / closing section (back cover or the like) for loading a film is provided on the back of the camera body,
An operation member is provided on the back side opposite to the finder eyepiece with the opening / closing part interposed therebetween so as to effectively use space and to prevent the operation member from obstructing when a photographer looks into the finder. It is desirable to prevent it. When a mirror box is provided to guide the light beam in the photographing optical path to the viewfinder, a viewfinder switching member and a focal plane shutter are attached to the mirror box so that operation can be confirmed in a unit state. Is desirable. As a result, it is possible to improve the reliability of the unit and thus the entire camera.

Further, the photographing screen frame switching member may be arranged on the focal plane shutter to further reduce the number of parts and reduce the cost.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) FIGS. 1 to 9 show a camera according to a first embodiment of the present invention. FIG. 1 is a mechanism layout diagram showing connections of main mechanisms in the camera. FIG. 2 is a rear view, and FIG. 3 is a central sectional view. 4 and 5 are operation diagrams of the photographing screen switching member. FIGS. 6 and 7 are diagrams viewed from A in FIG.
FIG. 9 is a diagram viewed from B in FIG.

First, the main mechanism will be described with reference to FIG. 1 is a photographing screen frame switching operation member which is slid by a user, 2 is a photographing screen switching lever connected to the operating member 1, 3 is a photographing screen switching mask A driven by the switching lever 2, and a photographing screen This is the switching mask B. Thereafter, the switching lever 2, and the masks A, B, 3, 4
Are collectively called a shooting screen switching member.

Reference numeral 5 denotes a finder mask A and reference numeral 6 denotes a finder mask B. Hereinafter, reference numerals 5 and 6 are collectively referred to as a finder field switching member. Reference numeral 7 denotes a focal plane shutter.

In this embodiment, the movement by the operation of the photographing screen frame switching operation member 1 is transmitted to the finder visual field switching members 5 and 6 via the photographing screen frame switching members 2 to 4.

Hereinafter, the overall structure of the camera will be described with reference to FIGS. 2 and 3, and then the main mechanism will be described in detail. The camera according to the present embodiment is a single-lens reflex camera with an interchangeable lens, equipped with a focal plane shutter 7, and light for finder observation is guided to a pentaprism optical system through a lens via a quick return mirror 22. It is. The film uses a 135 format film.

For 135 format film,
A large back cover 9 is attached to the back of the camera body 15 so as to be openable and closable. Reference numeral 8 denotes a finder eyepiece. The shooting screen frame switching operation member 1 is arranged on the opposite side of the finder eyepiece unit 8 with the back cover 9 interposed therebetween. FIG. 2 shows a state of the full screen size, and the operation unit 1a of the operation member 1 is shown.
Slide to the right with the pad of your finger to switch to the panorama screen size.

Reference numeral 10 denotes a bottom cover, 11 denotes a viewing window for reading the DX code of the loaded film cartridge, and 12 denotes an upper cover. The upper lid 12 is provided with an AE lock button 13 and an exposure correction button 14 so that exposure can be controlled with the thumb of the right hand.

The layout of the photographing screen frame switching operation member may be provided in the vicinity of the viewfinder eyepiece. However, the projection of the operation unit 1a becomes large, and it is unfavorable because it becomes an obstacle when looking into the viewfinder. . In the case of a film-compatible camera (APS film) in which a magnetic recording portion is formed on the film and the cartridge is loaded into the camera in a state where the film is completely housed, the operation member 1 is provided near the center of the rear surface. However, since the camera of the present embodiment is compatible with 135 format film, it is formed with a back cover 9 near the center of the rear surface, and it is difficult to connect a mechanism, which is not preferable.

Next, in FIG. 3, 15 is a main body,
It has a shooting screen frame 15a of full screen size. 16
Denotes a mirror box to which a camera mount 17 is attached. An interchangeable photographing lens (not shown) is attached to the camera mount 17. 18 is a bottom plate,
A tripod mounting screw 19 is provided integrally. Reference numeral 20 denotes a film pressure bonding plate, which is attached to the back cover 9 via a spring 21 and pressed against the film guide rail of the main body 15. By fixing the mount 16 and the body 15 to the mirror box 16 by screwing, the flange bag of the camera is assured.

Next, basic components mounted on the mirror box 16 will be described. 22 is a transflective mirror,
Reference numeral 23 denotes a total reflection mirror which is operated by a quick return mechanism (not shown). Reference numeral 24 denotes an autofocus signal detection unit. Reference numeral 25 denotes a focus plate, on which a finder mask A5 and a finder mask B6 are arranged. FIG. 3 shows a state where the viewfinder switching member is arranged at a position corresponding to the panorama size. Reference numeral 26 denotes a roof pentaprism, and the finder eyepiece 8 is formed by an eyepiece 8a, an eyepiece 8b, and an eyepiece frame 8c. 27 is a photometric lens and 28 is a photometric sensor.

The focal plane shutter 7 is also fixed to the mirror box 16 by screws. The focal plane shutter 7 includes a shutter base plate 7b and a cover plate 7a, and shutter blades are housed between them. A photographing screen switching member such as the photographing screen switching lever 2 is attached to the cover plate 7a. Further, the photographing screen frame switching operation member 1 is provided between the lower surface of the camera body 15 and the bottom cover 10.
And is slidably held.

Next, the main mechanism will be described in detail with reference to FIG. Click spring 2 for shooting screen frame switching operation member 1
Nine urging forces act on the panorama screen, and the panorama screen is slid to the right to stop at two positions. Further, the contact piece 30 is attached and slides on the position detection board 31 to generate an electric signal of a full screen size or a panoramic screen size. This signal passes through a processing circuit (not shown),
Used for mode switching during DATE imprinting. The movement of the shooting screen frame switching operation member 1 is transmitted to the shooting screen switching lever 2 via the absorption spring 32.

The photographing screen frame switching mechanism is attached to the cover plate 7a of the focal plane shutter 7. The photographing screen switching lever 2 is swingably supported about a shaft 32, one end is connected to the photographing screen switching mask A <b> 3 by a connecting shaft 33, and the other end is inserted into the elongated hole 2 a by the connecting shaft 34. It is slidably connected to the switching mask B4. The shooting screen switching mask A3 has a shaft 35 provided on the cover plate 7a inserted into the elongated hole 3a, and is held slidably with respect to the cover plate 7a. The photographing screen switching mask B4 is provided on the cover plate 7a in the elongated holes 4a, 4b, the shafts 36, 37 are inserted, and is held slidably with respect to the cover plate 7a. Further, transmission portions 4c and 4d for pushing the transmission lever 38 are provided on the switching mask B4.
And a spring hook 4e.

Reference numeral 39 denotes a shutter driving unit which is formed on the shutter base plate 7b and drives the shutter blades.

The shutter base plate 7b and the cover plate 7a
Are locked to each other by locking portions 7c and 7d as shown in FIG. Reference numerals 7e and 7f denote attachment portions of the shutter 7 to the mirror box 16, and are attached by screws. FIG. 4 shows a full screen size state, and FIG. 5 shows a panoramic screen size state.

Next, the connection of the photographing screen switching member will be described with reference to FIGS. FIG. 6 shows a state of the full screen size, and FIG. 7 shows a state of the panorama screen size. The transmission member 38 is attached to the mirror box 16 and has a long hole 3.
8a and 38b are slidably held by guide pins 42 and 43. The transmission units 38c and 38d are set to be in contact with the transmission units 4c and 4d of the screen size switching mask B4, respectively.

Further, the absorption spring 44 is provided with the spring hooks 4e, 3
8e and the transmission member 38 via the screen size switching mask B4
Acts in the direction of attracting. The drive pin 38f provided on the transmission member 38 acts on the arm 5b of the finder field switching mask A5. In the state of FIG. 6, the finder visual field switching mask A5 is rotated to a predetermined position in the counterclockwise direction about the rotation shaft 5a by a mechanism described later, and is spring-biased. When this state is as shown in FIG. 7, the drive pin 38f acts on the arm 5b to drive the finder visual field switching mask A5 to a predetermined position in the clockwise direction. The extra stroke is absorbed by the absorbing spring 44.

Next, the connection of the finder visual field switching member will be described with reference to FIGS. FIG. 8 shows a state of the full screen size, and FIG. 9 shows a state of the panorama screen size. Reference numeral 45 denotes a connection lever which links the finder visual field switching mask A5 and the finder visual field switching mask B6. 46 is a return spring, and a spring hook 45b
And acts on the connecting lever 45 through the shaft to bias the spring in a clockwise direction about the rotation shaft 45a.

Here, the whole operation is summarized. The viewfinder field switching members 5 and 6 are always biased by the action of the return spring 46 so as to display the full screen size shown in FIGS. 5 and 7. When the photographing screen frame switching operation member 1 is slid to the right in FIG.
Moves downward, the drive pin 38f acts on the arm 5b of the finder visual field switching mask A5, and the finder visual field switching member operates against the urging force of the return spring 46, as shown in FIGS. The panorama screen size is displayed as described above.

In this embodiment, the case where the photographing screen switching member and the finder visual field switching member are driven by the operating force of the photographing screen switching operation member 1 has been described. However, a motor or a solenoid that operates according to the operation of the operating member is described. The photographing screen switching member and the finder visual field switching member may be driven by the driving force of the driving source such as the above.

The present invention is also applicable to a camera having a shutter other than the focal plane shutter.

Further, the present invention can be applied to a camera in which a magnetic recording portion is formed on a film and a cartridge is loaded in a state where the film is completely stored.

[0035]

As described above, according to the present invention,
The photographing screen frame switching member is switched and driven by the switching operation force of the operating member or the driving force of the drive source operated by the switching operation of the operating member, and the finder field switching member is switched by the driven photographing screen frame switching member. With this configuration, the number of components can be reduced as compared with the case where separate driving mechanisms are provided for switching the photographing screen frame and switching the viewfinder field of view, and the size and cost can be reduced. Furthermore, since the finder field-of-view switching member always operates when the shooting screen frame switching member operates, the switching of the shooting screen frame can be surely confirmed by the finder, while when the shooting screen frame switching member does not operate, Since the finder field switching member is not operated, the accident detection capability can be improved.

When an opening / closing section (back lid or the like) for loading a film is provided on the back of the camera body, the operating member is connected to a finder eyepiece section sandwiching the opening / closing section on the back. If is provided on the opposite side, the space can be effectively used, and the operation member can be prevented from being obstructed when the photographer looks into the viewfinder.

When a mirror box for guiding the light beam in the photographing optical path to the finder is provided, the operation can be confirmed in a unit state by attaching a finder field switching member and a focal plane shutter to the mirror box. As a result, it is possible to improve the reliability of the above-described unit, and thus the entire camera. Further, if the photographing screen frame switching member is arranged on the focal plane shutter, it is possible to further reduce the number of parts and reduce the cost.

[Brief description of the drawings]

FIG. 1 is a layout diagram of a main mechanism of a camera according to a first embodiment of the present invention.

FIG. 2 is a rear view of the main mechanism.

FIG. 3 is a central sectional view of the main mechanism.

FIG. 4 is an operation diagram of a shooting screen switching member (at full screen) in the camera.

FIG. 5 is an operation diagram of the photographing screen switching member (at the time of a panoramic screen).

FIG. 6 is an A view of a main mechanism (at full screen) in FIG. 1;

FIG. 7 is a diagram A of a main mechanism (in a panorama screen) in FIG. 1;
View.

FIG. 8 is a B view of a main mechanism (at full screen) in FIG. 1;

FIG. 9 is a view B of the main mechanism (at the time of a panoramic screen) in FIG. 1;
View.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Screening frame switching operation member 2 ... Screening screen switching lever 3 ... Screening screen switching mask A 4: Photography screen switching mask B 5 ... Finder mask A 6 ... Finder mask B 7 ... Focal plane shutter 8 ... Finder eyepiece 9 … Back cover 10… bottom cover 16… mirror box 29… click spring 32… absorption spring 38… transmission member 44… absorption spring 45… connection lever 46… return spring

Claims (10)

[Claims] 1. A photographing screen frame switching member for switching a photographing screen frame, a finder visual field switching member for switching a finder visual field according to the photographing screen frame, and an operation member to be switched. A camera characterized in that when a member is switched, the photographing screen frame switching member is switched and the finder visual field switching member is switched through the photographing screen frame switching member. 2. The camera according to claim 1, wherein the photographing screen frame switching member and the viewfinder visual field switching member are switched by a switching operation force of the operation member. 3. The camera according to claim 1, wherein the photographic screen frame switching member and the finder visual field switching member are switched by a driving force of a driving source operated by a switching operation of the operation member. 4. An opening / closing portion for loading a film is provided on a back surface of the camera body, and the operation member is provided on the back surface of the camera body on a side opposite to a finder eyepiece across the opening / closing portion. The camera according to any one of claims 1 to 3, wherein: 5. The camera according to claim 1, wherein the shooting screen frame switching member switches the shooting screen frame between at least a full shooting screen frame and a panoramic shooting screen frame. 6. A mirror box for guiding a light beam in a photographing optical path to a finder, wherein the finder visual field switching member is attached to the mirror box. The camera according to. 7. The apparatus according to claim 1, further comprising a focal plane shutter, wherein the photographing screen frame switching member is arranged adjacent to the focal plane shutter. camera. 8. The camera according to claim 1, further comprising a focal plane shutter, wherein the photographing screen frame switching member is disposed on the focal plane shutter.
7. The camera according to any one of items 1 to 6. 9. A mirror box for guiding a light beam in a photographing optical path to a finder, wherein the focal plane shutter and the finder field-of-view switching member are attached to the mirror box. 9. The camera according to 7 or 8. 10. The camera according to claim 1, wherein the camera is of a single-lens reflex type.