JPH06347869A - Finder for camera - Google Patents

Abstract

PURPOSE:To reduce the number of parts and the cost and simultaneously, to miniaturize a finder by making a transparent plate one. CONSTITUTION:One transparent plate 6 is disposed so as to be adjustable by the movement in the direction of a finder optical axis 5, thereon between a mirror 3 and an eyepiece 4. The transparent plate 6 has plate thickness (t) larger than the depth (s) of an eye, an index (11) showing a photographing range in panoramic photographing and an autofocus mark (12) are provided on one surface 6a and a short-distance correcting index 13 and an autofocus mark 14 are provided on the other surface 6b. Then, the transparent plate 6 is moved to the side of an observer in the panoramic photographing, to locate one surface 6a in an image forming position (x) and to the side of an object in normal photographing, to locate the other surface 6b in the image forming position (x). Thus, the indexes (11) and 13 are switched.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a finder of a camera suitable for use in, for example, a compact camera having a zoom type photographing lens.

[0002]

2. Description of the Related Art Conventionally, in this type of camera, the shooting range is different between the standard shooting and the panoramic shooting, so that the index provided in the viewfinder is switched between the standard shooting and the panoramic shooting. For this reason, the viewfinder has a transparent plate on which an index (display frame) for standard shooting is displayed, a transparent plate on which an index (display frame) for panoramic shooting is displayed, and a lever, a button, etc. for switching between these transparent plates. Equipped with an appropriate switching means, while moving the standard shooting transparent plate on the viewfinder optical axis during standard shooting, the panoramic shooting transparent plate is retracted from the viewfinder optical axis, and the panoramic shooting transparent plate is opened during panoramic shooting. While moving to the optical axis of the viewfinder, the transparent plate for standard photography is retracted from the optical axis of the viewfinder.

[0003]

However, since such a conventional finder requires two transparent plates, the number of parts and the manufacturing cost increase, and one transparent plate is retracted from the optical axis of the finder. Since there is a need to secure a space for making the viewfinder large, there is a problem that it becomes an obstacle to downsizing the camera.

Therefore, the present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to reduce the number of parts and cost by using a single transparent plate. It is to provide a viewfinder for a camera that enables downsizing of the viewfinder.

[0005]

In order to meet such a demand, the viewfinder of the camera according to the first invention comprises one transparent plate disposed in the optical path between the objective lens and the eyepiece lens. , The transparent plate has a plate thickness equal to or greater than the depth of the eyes of the observer, and the first index for imaging is displayed on one surface, and the second index is displayed on the other surface at a position different from the first index. The index is displayed and is arranged so as to be movable and adjustable in the optical axis direction of the finder so that one of the surfaces is positioned on the image forming surface of the finder system. In a second aspect based on the first aspect, the first index indicates that the camera is set to the first angle of view for standard shooting, and the second index indicates that the camera is the first angle. This shows that the second angle of view for panoramic photography different from the angle of view is set.

[0006]

In the present invention, the transparent plate has a plate thickness equal to or larger than the eye depth. Here, the eye depth means the width in the finder optical path through which the observer can visually recognize the index of the transparent plate. Therefore, when one surface is within the depth range, only the index provided on the one surface is visually recognized, and the index on the other surface deviated from the depth position of the eye is not visually recognized. When switching to the index of the other surface, the transparent plate may be moved in the finder optical axis direction and the other surface may be moved to the eye depth position. The amount of movement of the transparent plate is only the thickness of the transparent plate, and is a very small amount of movement.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings. 1 is a perspective view of a finder optical system showing an embodiment of a camera finder according to the present invention, FIG.
(A), (b), (c) is a figure which shows one surface of a transparent plate,
It is a side view and a figure showing the other side. In these drawings, reference numeral 1 is a finder incorporated in the upper part of the camera body, and the finder 1 includes an objective lens 2 and a mirror 3
And an eyepiece 4, and one transparent plate 6 arranged on the finder optical axis 5 between the mirror 3 and the eyepiece 4.

The objective lens 2 is arranged so as to be movable and adjustable in the direction of the finder optical axis 7 in conjunction with the zoom lens of the lens barrel, and is composed of, for example, four objective lenses 2A to 2D. The lenses 2A and 2B are integrally coupled and arranged so as to be movable in the direction of the finder optical axis 7, and the remaining two objective lenses 2C and 2D are also integrally coupled so as to be movable in the direction of the finder optical axis 7. It is arranged. Objective lens 2A, 2B and objective lens 2C,
The 2D interval is changed during zooming, which allows the view angle of the viewfinder to be changed. The mirror 3 is the first mirror 3 tilted at a predetermined angle with respect to the finder optical axis 7.
A and the second tilted at a predetermined angle with respect to the finder optical axis 5.
And a mirror 3B, which reflects the subject image transmitted through the objective lens 2 and forms an image at the image forming position x. Eyepiece 4
Is composed of two eyepiece lenses 4A and 4B and two mirrors 8 and 9, respectively.

The transparent plate 6 has a plate thickness t which is equal to or larger than the depth s of the eyes of the observer and is arranged at the image forming position x of the finder optical axis 5, and two main surfaces 6a orthogonal to the finder optical axis 5. , 6
As shown in FIG. 2A, an index (first index) 11 for displaying a shooting range at the time of panoramic shooting and an Oto focus mark 12 are displayed on the object-side surface 6a of b. Used when shooting. On the other hand, on the observer-side surface 6b, an index (second index) 1 for short distance correction is provided.
3 and Oto focus mark 14 are displayed, and these are used at the time of standard size photography. The index 11 for panoramic photography is composed of two lines extending across the entire length of the facing plate 6 in the longitudinal direction on both sides of the auto focus mark 12. The short-distance correction index 13 is composed of a single line bent in an inverted L shape so as to surround the upper side and the right side of the otofocus mark 14.
Needless to say, these indexes 11 and 13 can be changed appropriately. The transparent plate 6 is adapted to be moved and adjusted on the finder optical axis 5 in the direction of the finder optical axis 5 by a plate thickness t by a movement adjusting mechanism (not shown) including an appropriate screw or the like. Sometimes it is moved to the observer side so that one surface 6a is positioned at the image forming position x,
At the time of standard photographing, the other surface 6b is moved to the subject side and is positioned at the image forming position x, whereby the indices 11 and 13 are switched. That is, since the plate thickness t of the transparent plate 6 is set to be larger than the depth s of the eyes of the observer (t> s), if one surface 6a is moved to the image forming position x during panoramic photographing, the other surface 6a is moved. 6b is located away from the eye depth s. Therefore, the observer can
Only the index 11 of a can be seen, and the index 13 of the other surface 6b cannot be seen. And one side 6
The subject image formed on a is magnified by the eyepiece lens 4 and can be viewed by an observer as a viewfinder image. On the other hand, when the other surface 6b is moved to the image forming position x during the standard photographing, the one surface 6a moves to a position away from the eye depth s. Therefore, the observer can see only the index 13 on the other surface 6b and cannot see the index 11 on the other surface 6a. And
The subject image formed on the other surface 6b is magnified by the eyepiece lens 4 and can be viewed by an observer as a viewfinder image.

As described above, according to the present invention, only one transparent plate 6 is provided, and an index 11 for panoramic photography and an index 13 for standard photography are displayed on both sides of the transparent board 6, respectively. Since the transparent plate 6 is moved in the direction of the finder optical axis 5 by the plate thickness t to switch the indexes 11 and 13, the number of transparent plates can be reduced by one, and the cost can be reduced. . Further, since the transparent plate 6 is moved by a small amount and is not retracted from the viewfinder optical axis 5, the viewfinder itself can be downsized.

[0011]

As described above, according to the viewfinder of the camera of the present invention, it is possible to display two in-finder displays.
Since it is configured with two transparent plates, it is possible to reduce the number of parts and cost, and in addition to reducing the number of parts, it is possible to move from the finder optical axis by the plate thickness in the finder optical axis direction. Since there is no need to evacuate, the viewfinder and eventually the camera itself can be made smaller, which is a great effect.

[Brief description of drawings]

FIG. 1 is a perspective view of a finder optical system showing an embodiment of a finder of a camera according to the present invention.

2A, 2B, and 2C are views showing one surface of a transparent plate, a side view, and a view showing the other surface.

[Explanation of symbols]

 1 camera viewfinder 2 objective lens 3 mirror 4 eyepiece 5 viewfinder optical axis 6 transparent plate 6a one side 6b the other side 11 panoramic shooting index 12 auto focus mark 13 near distance correction index 14 auto focus mark

Claims (2)

[Claims] 1. A transparent plate disposed in an optical path between an objective lens and an eyepiece lens, the transparent plate having a plate thickness equal to or greater than a depth of an observer's eye and provided on one surface thereof. A first index for photographing is displayed, a second index is displayed at a position different from the first index on the other surface, and one of the surfaces is positioned on the image plane of the finder system. The finder of the camera is arranged so that it can be moved and adjusted in the optical axis direction. 2. The viewfinder of the camera according to claim 1, wherein the first index indicates that the camera is set to a first angle of view for standard shooting, and the second index indicates that the camera is A viewfinder of a camera, characterized in that it is set to a second angle of view for panoramic photography different from the first angle of view.