CN2114180U - Hollow ridge prism - Google Patents

Abstract

The utility model relates to an eye level viewfinder device of a single-lens reflex camera. In the view-finder light path of the single-lens reflex camera, the ridge prism of the eye level viewfinder converts images which are opposite right and left into vertical images which has the same direction with an object. The utility model comprises a hollow frame (1) which is provided with and a posterosuperior side sealing face (4), a left sealing face (2) and a right sealing face (3) which is opposite to the left sealing face (2). The utility model also comprises three blocks of reflecting plates which respectively are a left side reflecting plate (5), a right side reflecting plate (6), and an image surface reflecting plate (7). The hollow ridge prism is also provided with a collecting mirror (8) and transparent sealing glass (9). The hollow ridge prism can effectively work even if the collecting mirror (8) and the transparent sealing glass (9) are not arranged, but the structure is more simple. The hollow ridge prism has the same optical principle with a solid glassy layer ridge prism. So the hollow ridge prism can efficiently work like the solid glassy layer ridge prism.

Description

Hollow ridge prism

The utility model relates to the viewfinder of looking squarely of Single-sens reflex camera.

In the light path of finding a view of Single-sens reflex camera, the roof prism of looking squarely view finder becomes the upright image identical with direction in kind with heterochiral image, for the user provides great convenience.

Roof prism before this all adopts solid glass to make, and like this, manufacturing cost height has not only also increased the weight of the weight of camera greatly.And very thick solid glass has absorbed the light in the light path of partly finding a view, and makes the image dimness of finding a view.

The purpose of this utility model is to provide a kind of in light weight, the hollow type roof prism of low cost of manufacture.

The utility model is achieved in that along each bar crest line position of roof prism one hollow frame is set, the room of crest line the right and left respectively embeds a reflector on ridge, and also embed a reflector in the room on imaging inclined-plane, will not need printing opacity, reflective empty position sealing.Like this, by find a view the reflector of image reversed left to right crest line the right and left on ridge on the screen of Single-sens reflex camera, it is transformed into the upright image projecting identical with direction in kind again on the imaging surface reflector, and observer's eyes can be seen the upright clearly image of finding a view behind framing eyepiece.

The utility model is because adopted hollow frame embedding reverse reflector structure, so the hollow type roof prism is not only in light weight, and makes and also be easy to, and the brightness of finding a view also can improve.

The concrete structure of utility model is provided by following embodiment and accompanying drawing thereof.

Fig. 1 is that Fig. 2 is the left side sectional view of hollow type roof prism according to the stereographic map of the hollow type roof prism that the utility model proposes, and Fig. 3 is the working condition sketch of hollow type roof prism in Single-sens reflex camera.

Describe details in detail below in conjunction with Fig. 1, Fig. 2, and the real work situation of this device is described in conjunction with Fig. 3 according to the concrete device that the utility model proposes.

This device comprises a hollow frame (1), and hollow frame (1) has left side sealing surface (2) and the right side sealing surface (3) relative with it, also has back upside sealing surface (4).This device also comprises three reflectors, is respectively: left side reflector (5), right side reflector (6), imaging surface reflector (7).This device also has condenser (8), the seal glass of printing opacity (9).

In the left side sectional view of this device, (10), (11), (12), (13), (14), (15) all are the concrete structures that are positioned at the hollow frame (1) on each bar crest line, with hollow frame (1) links together right side sealing surface (3) and back upside sealing surface (4) are arranged.The silver-plated reflective surface of the left side reflector (5) that embeds, right side reflector (6), imaging surface reflector (7) all should be inside.(16) be in kind, A, B are respectively left and right positioning marks.The image of (16) in kind is projected on the focusing glass (19) through camera lens (17), reflective mirror (18), and at this moment the A of image, B are reversed left to right.Image on the focusing glass (19) is through condenser (8), be projected on the imaging surface reflector (7) after the left side reflector (5) about crest line, right side reflector (6) reverse A, B again on the ridge, observer's eyes (20) just can be seen clearly the identical upright image (22) of direction with (16) in kind through framing eyepiece (21).Do not pack into the seal glass (9) of condenser (8), printing opacity of this device also can be worked fully effectively, but structure is simpler.

Claims (3)

1, be applicable to that looking squarely of Single-sens reflex camera found a view and use hollow type roof prism, this device that a hollow frame (1) is arranged, on its framework, embed three reflectors, it is characterized in that:

A. left side reflector (5) that the room of crest line the right and left embeds respectively on the ridge of hollow frame (1) and right side reflector (6),

B. the imaging surface reflector (7) that embeds at the imaging surface of hollow frame (1).

2, device according to claim 1 is characterized in that hollow frame (1) has left side sealing surface (2) and right side sealing surface (3).

3, device according to claim 1 is characterized in that hollow frame (1) has back upside sealing surface (4).

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