JPH10221768A - Finder device for camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact finder device capable of adjusting an information display position in finder visual field. SOLUTION: This device is provided with a light emission display part 7 displaying information concerning photographing by light emission, a reflection member 13 reflecting the light emission displayed information displayed by the light emission by the display part 7, and a display optical system projecting the light emission displayed information reflected by the member 13 to a specified position in the finder visual field. The member 13 is provided with an adjusting means which is turnably pivotally supported so that the reflecting direction of the light emission displayed information may be changed to adjust the information display position in the finder visual field.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a camera finder provided with a display system for displaying information required for photographing.

[0002]

2. Description of the Related Art FIG. 11 shows a known viewfinder device 1 for a camera. The finder device 1 generally includes a quick return mirror 2, a focus plate 3, a pentaprism (pentagonal roof prism) 4, a prism support frame 5 for supporting the pentaprism 4, a finder loupe 6 as an eyepiece, a display block 7, a reflection block. And a member 8.

The pentaprism 4 is used as a part of a finder optical system of a camera. An image from the photographing lens is reflected toward a finder optical system by a quick return mirror 2 arranged at an angle of 45 °. As a result, an inverted image of the subject is formed on the focus surface 3a of the focus plate 3. Light rays from the formed image of the subject are directed to the pentaprism 4 via a condenser lens (not shown). In the pentaprism 4, the light beam passes through a transmission surface (first transmission surface) 4a on the side facing the focus plate 3, and is reflected by a roof surface (second reflection surface) 4b as a reflection surface. Next, the reflective surface (third reflective surface)
4c, and the third reflecting surface 4c of the eyepiece 6
The light is reflected toward the transmission surface (fourth transmission surface) 4d on the side opposite to. The light is refracted at the time of transmission through the fourth transmission surface 4 d and guided to the finder loupe 6. Thereby, the inverted image is guided to the finder loupe 6 as an erect image by the action of the pentaprism 4.

On the other hand, information necessary for photographing, for example, information on the aperture, shutter speed, etc., is transmitted to a display block 7 by a transmission system (not shown). The information is displayed by light emission as character information. This light emitting display information is reflected by the reflecting member 8 and transmits through the first transmitting surface 4a of the pentaprism 4. In the pentaprism 4, the light is reflected by the roof surface (second reflection surface) 4b and the third reflection surface 4c, and travels toward the fourth transmission surface 4d. The light is refracted at the time of transmission through the fourth transmission surface 4 d and guided to the finder loupe 6.

[0005] For example, in the case of a single-lens reflex camera, the display block 7 may be placed in a gap between the pentaprism 4 and the focusing plate 3 together with a meter pointer and an LED dot.
Further, a viewfinder device 1 in which a display block 7 is arranged in a space above the front surface of the pentaprism 4 (the back surface of the fifth surface 4e) is also known.

When the photographer's eye 9 is placed on the eye point EP, an erect image of the subject is placed in the optical image frame in the viewfinder visual field.
In addition, information such as shutter speed and aperture required for photographing is visually recognized by the photographer in the information frame of the viewfinder visual field. In this way, the photographer can confirm information necessary for photographing while determining the composition in the viewfinder view.

[0007]

However, FIG.
Although the finder device 1 shown in FIG. 1 improves the assembling accuracy of each component to prevent the display optical system from being displaced, when the finder device 1 is fixed to the camera body 1 during the assembling process, character information is stored in an information frame. May shift vertically.

On the other hand, a viewfinder device having a display block 7 is known in which a plurality of reflecting members are arranged on the front surface of a pentaprism in order to make the optical path length uniform. Since the number of times is large, high assembly accuracy is required.

There is also known an apparatus in which a reflecting mirror is fixed by a spring and a screw, and the information display position is finely adjusted by changing the angle of the reflecting mirror in cooperation with the spring and the screw. Fine adjustment in the vertical direction using screws causes many problems, such as new left and right deviations.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a finder device for a camera that can adjust a display position of information in a finder visual field.

[0011]

According to a first aspect of the present invention, there is provided a light-emitting display section for displaying light-emitting information relating to photographing, a reflecting member for reflecting light-emitting display information displayed on the light-emitting display section, and a reflection member. A display optical system for projecting the light-emitting display information reflected by the member at a predetermined position in the viewfinder field of view, wherein the reflecting member is rotatably supported by the light-emitting display information. An adjusting means for adjusting the information display position of the finder visual field by changing the reflection direction is provided.

With this configuration, the information display position in the finder field of view is finely adjusted according to the rotation of the rotation support.

This adjusting means comprises a pivot integrally formed on both sides of the reflection member, one of the pivots is fitted and supported in a braking manner with a frictional force, and the other of the pivots is rotatably fitted. A shaft supporting portion rotatably supporting the reflecting member by being jointly supported, and a rotation adjusting portion for allowing the reflecting member to be rotatable on a pivot shaft on which the fitting member is supported in a braking manner. It is desirable to have. With this configuration, the reflection member is fixed by this frictional force with a simple configuration. In addition, the side on which the rotation adjusting portion is located is braked by friction, and the other end is freely rotatably fitted. Therefore, no unnecessary stress is applied to the reflection surface of the reflection member during rotation adjustment. Therefore, it is possible to accurately perform the rotation adjustment without causing a left-right shift in the adjustment of the display position.

The pivot support has a support having an opening at the upper end for mounting a pivot, and a detachment preventing portion for closing the opening of the support to prevent detachment of the pivot. It is desirable to be constituted by cooperation with a reflection member different from the reflection member provided with. As described above, if the shaft supporting portion is supported in cooperation with a reflecting member different from the reflecting member provided with the adjusting means, the shaft supporting portion can be designed to be compact, and the optical path length can be increased.

According to a fourth aspect of the present invention, the display optical system includes a pentaprism, and the luminescent display information is projected onto a finder field via the pentaprism. It is arranged on the back surface of the third reflection surface below the front surface of the prism, and at the lower end of the third reflection surface, a transmission surface for guiding the luminescent display information into the pentaprism is provided.

According to a fifth aspect of the present invention, there is provided a light-emitting display unit for emitting and displaying information relating to photographing, a reflecting member for reflecting the light-emitting display information displayed by the light-emitting display unit, and a light-emitting light reflected by the reflecting member. A display optical system for projecting display information to a predetermined position in a viewfinder visual field via a pentaprism,
The light-emitting display section and the reflection member are arranged on the back surface of the third reflection surface below the front surface of the pentaprism, and a transmission surface for guiding the light-emitting display information into the pentaprism is provided at a lower end of the third reflection surface. It is characterized by having.

According to the fourth and fifth aspects of the invention, the luminescent display information reflected by the reflection member is guided into the pentaprism from the transmission surface at the lower end of the third reflection surface, and the finder field frame is provided. Light emission display information is displayed at the lower end. The display unit and the reflection member are disposed below the front surface of the pentaprism, and no mounting equipment is required above the front surface of the pentaprism. Therefore, the configuration of the entire camera can be made compact. In addition, since the information display position is at the lower end of the finder field frame, it is easy to visually recognize the display.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a camera finder device according to the present invention will be described below with reference to the drawings. The same components as those in the description of the related art will be denoted by the same reference numerals, detailed description will be omitted, and only different portions will be described.

FIG. 9 is a perspective view for explaining an example of the appearance of a general single-lens reflex camera. A lens mount 11 is provided on the front of the camera body 10, and a photographic lens is mounted here by a bayonet method or the like. An upper decorative plate 12 is provided at an upper portion of the camera body 10, and a funder decorative plate 12a is provided at a substantially central portion of the upper decorative plate 12. A finder device 1 mainly including a pentaprism 4 described later is provided inside the finder decoration plate 12a. The viewfinder device 1 of the camera shown in FIG.
The fixed type is fixed to 0, but it may be a detachable type in which the pentaprism can be detached or an exchangeable type in which the pentaprism can be replaced. Generally, in the viewfinder device 1 of these cameras, an unnecessary space is often formed on the back surface of the third reflecting surface of the pentaprism 4.

As shown in FIGS. 1 to 8, in the finder device 1 of the present invention, the pentaprism 4 and the display block 7 arranged in a space below the front surface of the pentaprism (the back surface of the third reflection surface 4c). And reflection members 13 to 15, which are supported by the prism support frame 5.

As shown in FIGS. 2 and 6, the prism support frame 5 has a pair of mounting portions 1 on which the reflecting members 14 and 15 are mounted.
6, 17 and a field frame 18. This mounting part 1
The upper surfaces 16a and 17a of 6, 6 and 17 constitute a plane parallel to the focus surface 3a. The upper surface 16a has a shaft groove 16b having a U-shaped cross section, having an upward opening, and penetrating in the horizontal direction. A cross section U of a predetermined length is provided on the upper surface 17a.
There is a spindle groove 17b that is shaped like a letter and opens upward and inward. Furthermore, positioning pins 1 are provided on the upper surfaces 16a and 17a.
6c, 17c are projected upward, and the screw groove 16 is formed.
d and 17d are bored in the vertical direction.

The reflecting member 14 is integrally provided with rotating pivots 14b and 14c having circular cross sections at both ends with the reflecting surface 14a interposed therebetween. The pivot 14b is fitted tightly from the opening of the support shaft groove 16b. In addition, the pivot 1
Reference numeral 4c is attached through the opening of the shaft groove 17b and is loosely fitted. The end of the pivot shaft 14b protrudes outward from the support shaft groove 16b, and a rotation adjusting portion 14e having a vertical groove 14d is fixed outward. By fitting a flathead screwdriver or the like into the vertical groove 14d from the outside, the rotation pivot 14c can be rotated.

On the other hand, the reflecting member 15 has a reflecting surface 15 at the center.
a and a pair of flat plate portions 15b and 15c whose upper and lower surfaces are parallel surfaces at both ends of the reflection surface 15a. Each of the flat plate portions 15b and 15c has an engagement hole 1
5d, 15e, 15f and 15g are perforated. The engaging hole 15d is fitted to the positioning pin 16c, and the engaging hole 15g is fitted to the positioning pin 17c for positioning, and is placed on the planes 16a, 17a, respectively.
As shown in FIGS. 7A and 7B, a U-shaped support groove 16 is formed.
The upper surfaces of b and 17b are closed by the lower surfaces of the flat plate portions 15b and 15c, respectively, so that the rotating pivots 14b and 14c are closed so as not to separate from the mounting portions 16 and 17.

The reflecting member 13 has three flat reflecting surfaces 13.
a, 13b, and 13c. A convex lens portion 13c 'is provided on the upper surface of the reflection surface 13c.
However, flat portions 13d and 13e having upper and lower parallel surfaces are integrally formed on both sides of the reflection surfaces 13a, 13b and 13c. Engagement holes 13f, 13g, 13h, 13i are formed in the flat plate portions 13d, 13e, respectively. The engaging hole 13f is fitted to the positioning pin 16c, and the engaging hole 13i is fitted to the positioning pin 17c for positioning. 13g of engagement holes with screws not shown
A screw is inserted from above, and is fixed to the screw groove 16d through the engagement hole 15e. In addition, it is fixed to the screw groove 17d through the engagement hole 15f from above the engagement hole 13h by a screw (not shown). Thus, the reflection member 1
3 to 15 are fixed on the receivers 16 and 17. The reflection member 13 has display block holding portions 13j, 1 at both ends.
3k, in which a thread groove is formed.

The details of the display block 7 are, as shown in FIG. 8A, roughly a display LCD 7a, a backlight 7b,
It is composed of a plastic display block body 7d in which a zebra rubber 7c is stored. Information regarding the shutter speed and the aperture is externally input to the display block body 7d through the flexible substrate 7e. This input information is emitted and emitted as character information to the front of the display block (the pentaprism 4 side) by the backlight 7b.

The display block body 7d is sandwiched between two metal plates (a master plate 7f and a holding plate 7g) and is fixed by screws 7h. Both ends of the holding plate 7g are protruded from the display block, and are fixed to the display block holding units 13j and 13k by screws 7i. This reflection member 13
The pentaprism 4 is placed and fixed on the back surface of the lens and on the upper surface of the prism support frame 5.

The outline of the pentaprism 4 is, as shown in FIG. 2, a transmitting surface 4f formed at the lower end of the third reflecting surface 4c. This transmitting surface 4f is used when forming a reflecting film of the third reflecting surface 4c. Can be obtained by masking.

Next, the operation of this configuration will be described.

The information emitted and displayed by the display block 7 is reflected on the reflection surface 13 as shown by the arrows in FIGS.
The light is reflected by a, 14a, 15a, 13b, and 13c, passes through the pentaprism 4 from the transmission surface 4f, and travels toward the fourth transmission surface 4d. The light is refracted at the time of transmission through the fourth transmission surface 4 d and is guided to the finder loupe 6 via the field frame 18. Here, the length of the optical path from the display block 7 to the eye point EP and the distance from the focus plate 3 to the eye point E are determined by the convex lens portion 13c 'provided in the reflection optical path of the reflection member 13.
The optical path lengths up to P are configured to be equal.

When the photographer's eye 9 is placed in the eye point EP, as shown in FIG. 10, an erect image of the subject is placed in the optical image frame 19a of the finder visual field 19 and the information frame 19b of the finder visual field 19. Information such as shutter speed and aperture required for photographing is visually recognized by the photographer. In this way, the photographer can check information necessary for photographing while determining the composition in the finder visual field 19.

The reflection member 14 has pivot shafts 14 at both ends thereof.
b, 14c are the shaft grooves 16b, 17b and the flat plate portions 15b, 1
8c is rotatably supported in cooperation with 5c. When the vertical groove 14d of the rotation adjusting portion 14e is operated by a minus driver or the like to rotate the rotation pivot 14c, FIG.
As shown by the imaginary line in (b), the reflection member 14 rotates in the rotation direction of the arrow a. Thereby, the reflection direction of the reflection surface 14a is changed, the reflection direction of the light emission display information indicated by the straight arrow is changed and adjusted in the direction of the two-dot chain line arrow (up and down direction), and the display position of the light emission display information in the information frame 19b is displayed. Can be adjusted.

Thus, the photographer can display information necessary for photographing at an appropriate position in the information frame 19b of the viewfinder view map 19. This adjustment is very easy because the angle is only adjusted by a driver or the like. The rotation is accompanied by friction, and the reflection member can be fixed in a braking manner by this frictional force, so that the reflection member is accurate. Further, the other end of the rotation adjusting portion 14e (the rotation pivot 14c).
Are loosely fitted and are free ends, so that unnecessary stress is applied to the reflecting surface 14a during this adjustment,
a does not twist. Therefore, there is no shift in the reflection direction when adjusting the display position.

The display block 7 and the reflection members 13 to 15 are provided in a space below the front surface of the pentaprism 4 (the back surface of the third reflection surface).
Are disposed, so that unnecessary space can be effectively used.

In the above description, the aperture and shutter speed have been described as information. However, the present invention is not limited to this. Exposure interlocking range warning mark, ranging area, zone focus mark, date information, override mark, strobe charging signal, A film sensitivity, a film end signal, or the like may be displayed. Also, the display position is not limited to the lower end, and the optical image frame 19a
It may be on both sides of the upper part.

Instead of the pentaprism, for example, a pentamirror having the same function as the pentaprism formed by attaching a reflection mirror and forming a hollow shape may be used.

[0036]

As described above, according to the first aspect of the present invention, the reflection direction of the reflection member is adjusted by the rotation, and the display position of the information in the finder visual field can be adjusted.
This adjustment is easy and accurate.

According to the second aspect of the present invention, it is possible to accurately perform the rotation adjustment without causing a left-right shift in the adjustment of the display position. Further, since this adjusting means is provided integrally with the pivot of the reflecting member, the number of parts can be reduced and the cost can be reduced as compared with the information displaying position adjusting means using a spring and a screw.

According to the third aspect of the present invention, it is possible to design the apparatus compact and to increase the optical path length even with a small number of parts.

According to the fourth and fifth aspects of the present invention, the overall configuration of the camera can be made compact, and the information display position can be set at the lower end of the finder field frame where the display can be easily viewed.

[Brief description of the drawings]

FIG. 1 is a central sectional explanatory view for explaining the principle of a finder device according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view for explaining the entire configuration of the finder device according to the embodiment of the present invention.

FIG. 3 is a plan view for explaining an overall configuration of a finder device according to an embodiment of the present invention.

FIG. 4 is a front view for explaining the overall configuration of the finder device according to the embodiment of the present invention.

FIG. 5 is a partial left side view for explaining a main part of the finder device according to the embodiment of the present invention.

FIG. 6 is a plan view for explaining a prism support frame 5 of the finder device according to the embodiment of the present invention.

FIGS. 7A and 7B are partial cross-sectional views illustrating a rotation mechanism of a finder device according to an embodiment of the present invention.

8 (a) and 8 (b) are enlarged views of a main part of the center sectional explanatory view of FIG. 5;

FIG. 9 is a perspective view illustrating the overall shape of the single-lens reflex camera according to the present invention.

FIG. 10 is a field view of a finder device according to the present invention.

FIG. 11 is a central sectional explanatory view for explaining the principle of a finder device according to the prior art of the present invention.

[Explanation of symbols]

 7: display block (information display section) 13: reflection member 14e: rotation adjustment section 19: finder field of view

Claims (5)

[Claims] 1. A light-emitting display unit for emitting and displaying information related to photographing, a reflecting member for reflecting the light-emitting display information displayed by light-emitting on the light-emitting display unit, and a finder visual field for displaying the light-emitting display information reflected by the reflecting member. And a display optical system for projecting the information on the finder visual field, wherein the reflection member is rotatably supported by a shaft to change the reflection direction of the light emission display information. A viewfinder device for a camera, comprising an adjusting means for adjusting a display position. 2. The adjusting device according to claim 1, wherein said adjusting means includes a pivot integrally formed on both sides of said reflection member, one of said pivots is fitted and supported in a braking manner with a frictional force, and the other of said pivots is free to rotate. A shaft supporting portion rotatably supporting the reflection member by being loosely supported on the shaft; and a rotation allowing the rotation of the reflection member to be adjusted by a pivot on the side on which the braking member is fitted and supported. The viewfinder device for a camera according to claim 1, further comprising an adjustment unit. 3. The adjusting means having a support having an opening for mounting a pivot at an upper end thereof, and a detachment preventing portion for closing the opening of the support to prevent detachment of the pivot. The finder device for a camera according to claim 2, wherein the finder device is configured by cooperation with a reflection member different from the reflection member provided with: 4. The display optical system includes a pentaprism, and the light-emitting display information is projected onto a finder field via the pentaprism, and the light-emitting display unit and the reflection member are provided below a front surface of the pentaprism. 2. The camera according to claim 1, wherein a transmission surface is provided on a back surface of the third reflection surface, and a transmission surface for guiding the light-emitting display information into the pentaprism is provided at a lower end of the third reflection surface. Viewfinder device. 5. A light-emitting display section for emitting and displaying information related to photographing, a reflecting member for reflecting the light-emitting display information displayed by the light-emitting display section, and a pentaprism for displaying the light-emitting display information reflected by the reflecting member. A display optical system for projecting a predetermined position in a finder field via a finder prism, wherein the light-emitting display unit and the reflection member are arranged on a back surface of a third reflection surface below a front surface of the pentaprism. A finder device for a camera, wherein a transmission surface for guiding the light-emitting display information into the pentaprism is provided at a lower end of the third reflection surface.