JPH05107596A - Albada type bright frame finder - Google Patents

Abstract

PURPOSE:To display only either of field frames for first size or second size, according to the photographing of the first size or that of the second size. CONSTITUTION:In this Albada type bright frame finder having only a field frame for full size 22, a panoramic changeover mirror lens 30 is taken in and out between an objective lens 10 and an eyepiece 20, according to the photographing of the full size or that of panoramic size. In other words, when the photographing of the full size is executed, the field frame for the full size is displayed as it is. On the other hand, when the photographing of the panoramic size is executed, the panoramic changeover mirror 30 is inserted, the above-mentioned field frame for the full size is reflected by the panoramic changeover mirror lens 30, to form the virtual image of the field frame for the panoramic size. Thus, only the field frame can be displayed according to the photographing of the full size or that of the panoramic size.

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 shooting full size and panoramic size.

[0002]

2. Description of the Related Art Conventionally, a viewfinder adapted to a camera capable of shooting full-size and panoramic-size images is shown in FIG.
The field of view frame as shown in is used. In the figure,
Reference numeral 2 is a full-size field frame, 4 is a field frame for parallax correction during short-range shooting, 6 is a panoramic size field frame, and 8 is a target mark.

In other words, when performing full-size shooting,
The composition is determined so that the subject falls within the visual field frame 2, and the composition is determined so that the subject does not enter above the visual field frame 4 during short-distance shooting. Determine the composition so that you can enter. The aspect ratio of the full size is 2: 3, and the aspect ratio of the panoramic size is 1: 2.6.

[0004]

However, in the case of the above-described conventional viewfinder, the photographer selects a field frame depending on whether full-size shooting or panorama size shooting is performed, and the subject is placed in the selected field frame. You must compose the shot so that you can enter it, you must always pay attention to the selection of the field of view frame, and use the field of view frame for panorama size when shooting full size, There is a problem that mistakes such as using the field of view frame are likely to occur.

The present invention has been made in view of the above circumstances. Depending on whether the first size image is taken or the second size image is taken, either the first size field frame or the second size image field frame is used. An object of the present invention is to provide an albada-type bright frame finder capable of displaying only one of the visual field frames.

[0006]

In order to achieve the above-mentioned object, the present invention is adapted to a camera capable of photographing a first size and a second size, and has only a field frame for the first size. In the albada type bright frame finder, the albada type bright frame finder is arranged so as to be freely inserted and removed between the objective lens and the eyepiece lens,
And a field frame switching mirror lens having an opening for a second size and having a concave mirror around the opening for reflecting the field frame for the first size to form a virtual image of the field frame for the second size. A switching mechanism that inserts the field-view frame switching mirror lens between the objective lens and the eyepiece lens at the time of photographing in the second size.

[0007]

According to the present invention, in the albada type bright frame finder having only the visual field frame for the first size, the visual field frame is switched depending on whether the first size image is taken or the second size image is taken. The mirror lens is inserted and removed between the objective lens and the eyepiece lens. That is, when shooting the first size, the field frame for the first size is displayed as it is. On the other hand, when shooting the second size, the field frame switching mirror lens is inserted, and the field frame switching mirror lens is used to move the first frame. The field of view frame for the size of
I am trying to form a virtual image of the field frame for the size of.
As a result, it is possible to display only the field frame depending on whether the first-size shooting or the second-size shooting is performed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of an albada type bright frame finder according to the present invention will be described in detail below with reference to the accompanying drawings. First, the principle of the albada type bright frame finder according to the present invention will be described with reference to FIGS.

As shown in FIG. 2, the albada type bright frame finder comprises an objective lens 10 and an eyepiece lens 20, and a reflective film is vapor-deposited on the inner surface 10A of the objective lens 10 so as to form a semitransparent concave mirror. The field frame 20 is directly vapor-deposited on the inner surface 20A of the eyepiece lens 20. The field frame 22 is a full-size field frame.

Therefore, at the time of full-size photographing, the field frame 22 is illuminated by the light entering from the objective lens 10 and reflected by the inner surface 10A of the objective lens 10 to form a virtual image of the field frame 22 at a distance. Then, the virtual image of the field frame 22 and the image of the subject are simultaneously observed by the eyepiece lens 20. Now, in the albada type bright frame finder according to the present invention, as shown in FIG. 2, the panorama switching mirror lens 30 is disposed between the objective lens 10 and the eyepiece lens 20 so as to be freely inserted and removed. That is, the panorama switching mirror lens 30 is rotatably arranged via the support shaft 30A, and when rotated in the clockwise direction, it is inserted between the objective lens 10 and the eyepiece lens 20 (see FIG. 2). State), when rotated counterclockwise,
It is retracted from between the objective lens 10 and the eyepiece lens 20.

As shown in FIG. 3, the panorama switching mirror lens 30 has an opening 32 having an aspect ratio for panorama size, and a concave mirror portion 34 for total reflection is formed around the opening 32. The concave mirror portion 34 reflects the full-size field frame 22 when the panorama switching mirror lens 30 is inserted between the objective lens 10 and the eyepiece lens 20 as shown in FIG. It is configured to form a virtual image of the size field frame. The appearance of the panoramic size field frame will be described later.

FIG. 1 is a perspective view of a main part of a camera to which the albada type bright frame finder shown in FIG. As shown in the figure, this camera is switched to a state in which panorama size shooting is possible by a switching lever 40 that switches between panorama size shooting and full size shooting (normal shooting).

In this state, the panorama switching mirror lens 30 is inserted between the objective lens 10 and the eyepiece lens 20 so that the panoramic size field frame can be seen as described above. In addition, the upper and lower light blocking members 42A, 42
The upper and lower sides of the film (not shown) are shielded by B so that the exposure can be performed in a panoramic size aspect ratio. Next, a case of switching from the panoramic size shooting state to the normal shooting state will be described.

In this case, the switching lever 40 is moved from the panoramic position to the normal position as shown by the arrow. By the movement of the switching lever 40, the members described below rotate or move in the directions indicated by the arrows. That is, the lever 44 is rotated by a certain amount in the arrow direction, and the click spring 46 holds the rotational position. The rotation of the lever 44 causes the lever 48 to rotate in the arrow direction against the biasing force of the spring 50, and the rotation of the lever 48 causes the panoramic switching mirror lens 30 to resist the biasing force of the spring 52. The support shaft 30A is rotated in the direction of the arrow. As a result, the panorama switching mirror lens 30 inserted between the objective lens 10 and the eyepiece lens 20 is retracted, and the panoramic size field frame is switched to the full size field frame.

On the other hand, by the movement of the switching lever 40,
The levers 54, 56, 58, the rod 60, and the lever 62 are each rotatable or movable in the arrow direction.
The biasing force of the spring 64 that biases the light shielding member 42A, 42 and the light shielding members 42A, 42 that are biased in the opening direction by the springs 66, 68.
The lever 54, 56, 58 is rotated in the arrow direction by the pressing force from B, the rod 60 is lifted in the arrow direction, and the lever 62 is rotated in the arrow direction.

Then, the upper and lower light shielding members 42A and 42B are rotated in the direction of the arrow and retracted so that the film (not shown) can be exposed with a full size aspect ratio. In addition, lever 5
6 and the lever 58 are integrated by a spring 70 and normally rotate at the same time. However, when the light shielding members 42A and 42B cannot be rotated when the lever 58 is pressed by the rod 60, only the lever 58 is rotated. Is rotated so that no force more than the biasing force of the spring 70 is applied to the member at the rear stage.

Next, variations of the panorama switching mirror lens and the field frame, and how the panorama size field frame looks in each variation will be described. Figure 4
(A), (B) and (C) respectively show a first example of how the panorama switching mirror lens, the field frame and the field frame for panorama size are viewed. This panorama switching mirror lens has a concave mirror portion 36 above and below the opening for panorama size.
A and 36B are provided. In addition, in FIG. 7A, · indicates the eccentric position of each concave mirror portion.

When the field frame of FIG. 4B is reflected by the panorama switching mirror lens, the field frame for panorama size as shown in FIG. 4C becomes visible.
As for the upper and lower frames of this field frame, some of the frames (upper and lower frames) of the field frame of FIG.
It is a virtual image reflected by 6A and 36B,
The left and right frames and the target mark are virtual images formed by being reflected by the inner surface of the objective lens 10. Also, FIG.
In (C), reference numeral 37 is the entire field of view defined by the aperture of the panoramic switching mirror lens.

FIGS. 5A, 5B and 5C show a second example of how the panorama switching mirror lens, the field frame and the field frame for the panorama size look, respectively. This panorama switching mirror lens is above the opening for panorama size,
Concave mirror portions 38A, 38B, 38C are provided on the lower left and lower right. When the field frame of FIG. 5 (B) is reflected by the panorama switching mirror lens, the field frame for panorama size as shown in FIG. 5 (C) becomes visible.
The upper, lower left and lower right frames of this field frame are the upper, lower left and lower right frames of FIG. 5B, respectively.
It is a virtual image reflected and formed by the concave mirror portions 38A, 38B, 38C on the lower right side.

FIGS. 6A, 6B and 6C respectively show a third example of how the panorama switching mirror lens, the field frame and the field frame for panorama size look. This panorama switching mirror lens has concave mirror portions 39A, 39B, 39C, 39D at the top, bottom, left and right of the panorama size opening.
Is provided. When the field frame of FIG. 6 (B) is reflected by the panorama switching mirror lens, the field frame for panorama size as shown in FIG. 6 (C) becomes visible. That is, the upper, lower, left and right frames of this field frame are shown in FIG.
The upper and lower and left and right portions of the field of view frame are the concave and upper concave mirror portions 39A, 39B, 39C and 39D, respectively.
It is a virtual image reflected and bound by.

The shape and number of concave mirrors of the panorama switching mirror lens, the shape of the field frame for full size, and the like are not limited to this embodiment, and various other shapes are conceivable. Further, the panorama switching mirror lens is not limited to the rotary type, but may be a slide type that can be inserted and withdrawn between the objective lens and the eyepiece lens. In the embodiment of the present invention, the first size is the full size and the second size is the panoramic size, but the second size may be a half size, a cine size, or a high definition size. Further, the first and second sizes may be appropriately selected from the full size, panorama size, half size, cine size, and high definition size.

[0022]

As described above, according to the bright frame finder of the albada type according to the present invention, the field of view frame for the first size or the first size is selected depending on whether the first size or the second size is taken. It is possible to display only one of the two view frames for the two sizes, which makes it easier to see the view frame and solves the problem of deciding the composition by mistakenly selecting the view frame.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part of a camera to which an albada-type bright frame finder according to the present invention is applicable and which is capable of shooting full-size and panoramic-size images.

FIG. 2 is a diagram showing an optical system of an albada type bright frame finder according to the present invention.

FIG. 3 is a front view of the panorama switching mirror lens of FIG.

4A, 4B, and 4C are diagrams showing a first example of how a panorama switching mirror lens, a field frame, and a field frame for a panoramic size are viewed, respectively.

5 (A), (B) and (C) are diagrams showing a second example of how a panorama switching mirror lens, a field frame and a field frame for panorama size are viewed, respectively.

6 (A), (B) and (C) are diagrams showing a third example of how a panorama switching mirror lens, a visual field frame and a visual field frame for panoramic size are viewed, respectively.

FIG. 7 is a plan view of a field frame of a conventional finder that is applied to a camera capable of shooting full-size and panoramic-size images.

[Explanation of symbols]

10 ... Objective lens 20 ... Eyepiece 22 ... Field frame 30 ... Panorama switching mirror lens 32 ... Aperture 34, 36A, 36B, 38A, 38B, 38C, 39
A, 39B, 39C, 39D ... concave mirror portion 40 ... switching lever 44, 48 ... lever 50, 52 ... spring

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Seiji Asano 1-324 Uetakecho, Omiya City, Saitama Prefecture Fuji Photo Optical Co., Ltd. (72) Inventor Hideo Kobayashi 1-324 Uetakecho, Omiya City, Saitama Prefecture Fuji Inside Photo Koki Co., Ltd.

Claims (2)

[Claims] 1. An Albada-type bright frame finder adapted to a camera capable of photographing in a first size and a second size and having only a field frame for the first size, wherein the objective of the albada-type bright frame finder is It is arranged between the lens and the eyepiece so that it can be freely taken in and out.
A field frame switching mirror lens having an opening for the size of, and a concave mirror that reflects the field frame for the first size around the opening to form a virtual image of the field frame for the second size, A switching mechanism for inserting the field-of-view frame switching mirror lens between the objective lens and the eyepiece at the time of image capturing of size 2, and an alvada-type bright frame finder. 2. The concave mirror in the field frame switching mirror lens comprises a plurality of concave mirrors, and the plurality of concave mirrors are respectively arranged with eccentricity and / or declination, and a part of the field frame for the first size. 2. The albada-type bright frame finder according to claim 1, wherein a virtual image of the field frame for the second size is formed by reflecting the light.