JP2962375B2 - Albada-type bright frame finder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an Albada-type bright frame finder, and more particularly to an Albada-type bright frame finder adapted to a camera capable of photographing in full size and panoramic size.

[0002]

2. Description of the Related Art Conventionally, a viewfinder adapted to a camera capable of taking a full-size image and a panoramic image is shown in FIG.
A field frame as shown in FIG. In the figure,
2 is a field frame for full size, 4 is a field frame for parallax correction at the time of close-up shooting, 6 is a field frame for panorama size, and 8 is a target mark.

That is, when performing full-size shooting,
The composition is determined so that the subject enters the field of view frame 2, the composition is determined so that the subject does not enter above the field of view frame 4 at the time of close-up shooting, and the subject is set to the field of view frame 6 in the case of panoramic size photography. Frame your composition so that you can enter. The aspect ratio of the full size is 2: 3, and the aspect ratio of the panorama size is 1: 2.6.

[0004]

However, in the case of the above-mentioned conventional finder, the photographer selects a field of view depending on whether full-size shooting or panorama-size shooting is performed, and the subject is placed in the selected field of view. You must always be careful to select the field of view, use a panorama-size field of view for full-size shooting, or use a full-size There is a problem that mistakes such as the use of a field frame are likely to occur.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide an albada-type bright frame finder capable of displaying an appropriate visual field frame depending on whether full-size shooting or panoramic-size shooting is performed. Aim.

[0006]

According to the present invention, there is provided an albada-type bright frame finder adapted to a camera capable of photographing a first size and a second size. A field frame plate for the first size disposed immediately before the eyepiece of the frame finder, and a second frame rotatably disposed between the objective lens and the eyepiece of the albada-type bright frame finder. A size field frame plate and a second size field frame plate are inclined when the first size is photographed, and reflected light of the second size field frame is reflected out of the optical path to obtain a second size frame. A field frame plate switching mechanism for arranging the field frame plate for the second size at right angles to the finder optical axis between the objective lens and the eyepiece at the time of photographing.

Further, in an Albada type bright frame finder adapted to a camera capable of photographing a first size and a second size, the Albada type bright frame finder is rotatable between an objective lens and an eyepiece. A first size field of view frame plate, and a first size of field of view frame plate provided at a predetermined angle,
A second size field frame plate rotatably disposed between the objective lens and the eyepiece of the Albada-type bright frame finder, and a first size field frame plate for photographing the first size. The second size field frame is arranged orthogonally to the finder optical axis and the reflected light of the second size field frame is reflected out of the optical path by tilting the second size field frame.
A field frame plate switching mechanism that arranges the size field frame plate orthogonal to the viewfinder optical axis and tilts the first size field frame plate to reflect the reflected light of the first size field frame out of the optical path; It is characterized by having.

[0008]

According to the present invention, an appropriate field frame is displayed in the albada-type bright frame finder depending on whether the photographing is of the first size or the second size. That is, the field frame plate for the panorama size is provided rotatably, and the field frame plate for the panorama size is tilted between the objective lens and the eyepiece during full-size shooting,
Only the full-size field frame is displayed, and a panorama-size field frame plate is arranged between the objective lens and the eyepiece at the time of panorama-size shooting so as to be orthogonal to the viewfinder optical axis to display both field frames. I have.

According to another aspect of the present invention, in the albada-type bright frame finder, a full-size field frame or a panorama-size field frame is displayed according to whether full-size shooting or panorama-size shooting. I am trying to do it. That is, two field frame plates, a full size field frame plate and a panorama size field frame plate, are prepared, and the full size field frame plate is placed between the objective lens and the eyepiece during full size shooting. Are arranged orthogonally to the finder optical axis, and a panorama size field frame plate is orthogonally arranged to the finder optical axis between the objective lens and the eyepiece during panoramic size imaging. As described above, it is possible to display only the field of view frame corresponding to the full-size shooting or the panorama-size shooting.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a preferred embodiment of an albada-type bright frame finder according to the present invention. FIG. 1 is a view showing an embodiment of an albada-type bright frame finder according to the present invention, and this albada-type bright frame finder is applied to a camera capable of photographing in full size and panorama size. That is, this type of camera has a switching lever for switching between panorama-size shooting and full-size shooting, as is well known, and when switching to panorama-size shooting is performed by this switching lever, the upper and lower light-shielding members cause the film to be cut off. The top and bottom are shaded, and the film is exposed at a panoramic size aspect ratio,
On the other hand, when switching to full-size shooting, the upper and lower light shielding members are retracted, and the film is exposed at the full-size aspect ratio. Now, as shown in FIG. 1, the Albada type bright frame finder includes an objective lens 10, an eyepiece 12, a half mirror lens 14, and a panorama size field frame plate 16. A full-size field frame 12A is formed on the front surface of the eyepiece, and a reflective film is deposited on a surface 14A inside the half mirror lens 14 so as to form a translucent concave mirror.

The field frame plate 16 for the panorama size includes the support shaft 1.
As shown by an arrow through 6A, the camera is rotatably disposed between a normal position and a panoramic position, and a field frame 16B for panorama size is formed on the back side of the field frame plate 16. At the time of full-size shooting, the panorama-size field frame plate 16 is tilted as shown by the solid line in FIG. 1, and at the time of panorama-size shooting, the panorama-size field frame plate 16 is tilted as shown by the dotted line in FIG. Is disposed orthogonal to the finder optical axis immediately before the eyepiece lens 12.

The full-size and panoramic-size photographing are switched by a switching lever. The movement of the panorama-size field frame plate 16 is performed by a mechanism (not shown) mechanically linked to the switching lever. Alternatively, this is performed by an actuator driven according to the switching position of the switching lever. Now, at the time of full-size photographing shown by the solid line in FIG. 1, the field frame of the eyepiece 12 is illuminated with light entering from the objective lens 10 and the half mirror lens 1
The virtual image of the field frame for the full size is reflected at the inner surface 14A of the camera 4 at a distance. Then, the virtual image of the field frame and the image of the subject are simultaneously observed by the eyepiece lens 12. At this time, since the field frame plate 16 is inclined, the reflected light of the field frame 16B is reflected out of the optical path, and
Is not observed.

On the other hand, at the time of panoramic size photographing, the field frame plate 16 is arranged orthogonal to the optical axis as shown by the dotted line from the state shown by the solid line in FIG. Then, the light from the objective lens 10 is applied to the field frame 16 of the field frame plate 16 for panorama size.
B and the full-size field frame 12A are illuminated, reflected by the inner surface 14A of the half mirror lens 14, and reflected in the panorama-size field frame 16B and the full-size field frame 12
A virtual image of A is formed at a distance. Then, as shown in FIG. 2, the virtual images of the field frames 16B and 12A are simultaneously observed by the eyepiece lens 12. It should be noted that the field frame 16B also includes the character "P" shown in FIG. 2, and when the field frame 16B is observed, the character "P" indicates that it is a panoramic size.

FIG. 3 is a view showing another embodiment of an albada-type bright frame finder according to the present invention. As shown in FIG. 1, the Albada-type bright frame finder includes an objective lens 10 and an eyepiece 12.
A reflective film is deposited on the inner surface 14A of the half mirror lens 14 so as to form a translucent concave mirror. Field frame plate 16 for panorama size and field frame plate 18 for full size
Is fixed to the shaft 20 at a predetermined angle. A field frame 16B shown in FIG. 4B is formed on the panorama size field frame plate 16, and a field frame 16B shown in FIG.
Is formed. Incidentally, 21 is the field frame plate 1
6 and 18 are stoppers.

At the time of full-size photographing, the field frame plate 16 is inclined and the field frame plate 18 is arranged orthogonal to the finder optical axis as shown by the solid line in FIG. Therefore, at the time of full-size shooting, the light from the objective lens 10 illuminates the field frame 18A of the field frame plate 18 and the half mirror lens 1
The virtual image of the field frame 18A is formed at a distant place by being reflected by the surface 14A inside 4. Then, the virtual image of the field frame 18A and the image of the subject are simultaneously observed by the eyepiece lens 12.

At this time, since the field frame plate 16 is inclined,
The reflected light of the panorama-size field frame 16B is reflected outside the optical path, and the field frame 16B is not observed. At the time of panorama size photographing, the field frame plate 18 is arranged obliquely as shown by the dotted line in FIG. 3, and the field frame plate 16 is arranged orthogonal to the finder optical axis. Therefore, at the time of shooting for the panorama size, the light from the objective lens 10 illuminates the panorama size field frame 16B of the field frame plate 16 and the half mirror lens 1
The virtual image of the visual field frame 16B is formed at a long distance by being reflected by the inner surface 14A of the light source 4. Then, the virtual image of the field frame and the image of the subject are simultaneously observed by the eyepiece lens 12. At this time, since the field frame plate 18 is inclined, the reflected light from the full-size field frame 18A is reflected outside the optical path, and the field frame 18A is not observed.

Although the first size is a full size and the second size is a panorama size in the embodiment of the present invention, the second size may be a half size, a cine size, or a high definition size. Further, the first and second sizes can be appropriately selected from a full size, a panoramic size, a half size, a cine size, and a high definition size.

[0018]

As described above, according to the albada-type bright frame finder according to the present invention, the field frame can be displayed according to the photographing of the first size or the photographing of the second size. The problem of erroneously determining the composition can also be solved.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of an albada-type bright frame finder according to the present invention.

FIG. 2 is a view showing a field frame at the time of panorama in the embodiment of FIG. 1;

FIG. 3 is a diagram showing another embodiment of an albada-type bright frame finder according to the present invention.

FIGS. 4A and 4B are views showing a full-size field frame and a panorama-size field frame of the embodiment of FIG.

FIG. 5 is a plan view of a field of view of a conventional finder adapted to a camera capable of photographing in full size and panorama size.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Objective lens 12 ... Eyepiece 16 ... Field frame board for panorama size 18 ... Field frame for full size

──────────────────────────────────────────────────続 き Continuing on the front page (72) Kazunori Ohno 1-324 Uetakecho, Omiya City, Saitama Prefecture Inside Fuji Photo Optical Co., Ltd. (72) Seiji Asano 1-324 Uetakecho, Omiya City, Saitama Prefecture (72) Inventor Hideo Kobayashi 1-324 Uetake-cho, Omiya-shi, Saitama Prefecture In-house Fuji Photo-Optics Co., Ltd. (56) Reference: Hikaru 3-71334 (JP, U) ( 58) Field surveyed (Int.Cl. ⁶ , DB name) G03B 13/00

Claims (2)

(57) [Claims] 1. An Albada-type bright frame finder adapted to a camera capable of photographing a first size and a second size, comprising: a first frame disposed in front of an eyepiece of the Albada-type bright frame finder. A field frame plate for a size, a field frame plate for a second size rotatably disposed between an objective lens and an eyepiece of the Albada-type bright frame finder, and a field frame plate for a first size. Tilt the field frame plate for the second size
The second reflected light field frame for size reflects the optical path arranged, finder field frame plate for the second size between the objective lens and the eyepiece when shooting a second size An Albada-type bright frame finder, comprising: a field frame plate switching mechanism arranged orthogonally to the optical axis. 2. An albada-type bright frame finder adapted to a camera capable of photographing a first size and a second size, wherein the albada-type bright frame finder is rotatable between an objective lens and an eyepiece. A first size field frame plate, and a first size field frame plate provided at a predetermined angle, between an objective lens and an eyepiece of an albada-type bright frame finder. A second size field-of-view frame plate rotatably disposed; and a first size field-of-view frame plate arranged orthogonally to the finder optical axis when photographing the first size. The frame is tilted to reflect the reflected light of the second size field frame to the outside of the optical path, and the second size field frame plate is arranged orthogonally to the finder optical axis and the first size at the time of shooting of the second size. Watching An albada-type bright frame finder, comprising: a field frame plate switching mechanism for tilting the field frame plate to reflect the reflected light of the first size field frame to the outside of the optical path.