Viewfinder for single lens reflex cameras including means to view exposure guides专利检索-屋脊地板，天花板和屋顶专利检索查询-专利查询网

Viewfinder for single lens reflex cameras including means to view exposure guides

阅读：261发布：2022-03-04

专利汇可以提供Viewfinder for single lens reflex cameras including means to view exposure guides专利检索，专利查询，专利分析的服务。并且The viewfinder comprises a pentagonal roof prism and a pair of wedge prisms interposed between the roof prism and an eye-piece. The wedge prisms are so arranged that their sloping surfaces face each other with an air gap therebetween, and the light flux travelling directly from the bottom face of the pentagonal roof prism to the slanting surfaces is deflected by full reflection. At least one reflecting surface is provided on one of the wedge prisms, and the light rays from an information source are guided into the wedge prism and to the eye piece after reflection on the reflecting surface, with diaphragm information being indicated in the viewfinder. The light flux from the information source or sources travels either through the pentagonal roof prism or directly from the information source to the wedge prisms.，下面是Viewfinder for single lens reflex cameras including means to view exposure guides专利的具体信息内容。

权利要求

1. In a viewfinder for single lens reflex cameras of the type including a focussing screen, an objective lens forming an image of an object on the focussing screen, a pentagonal roof prism having a bottom light entry surface, a roof surface, at least one front reflecting surface and a rear light exit surface, an eyepiece facing the rear light exit surface, an optical element interposed between the rear light exit surface of the pentagonal prism and the eyepiece and having a reflection-transmission surface for directing, toward the eyepiece, light entering the bottom surface of the pentagonal prism from the focussing screen and reflected by the roof surface and the front reflecting surface for projecting through the light exit surface toward the eyepiece, the optical element having a reflecting surface operable to totally reflect, in a direction away from the eyepiece, undesired light entering the bottom surface of the pentagonal prism and internally reflecteD in the pentagonal prism by the roof surface, the front surface and the bottom surface toward the light exit surface: the improvement comprising, in combination, at least one indication member; and means, including said optical element, forming at least one reflection surface additionally reflecting light from said indication member to said eyepiece.

2. A viewfinder for single reflex cameras, as claimed in claim 1, in which said optical element includes a prism having a first surface opposing and parallel to said light exit surface of said pentagonal prism, and having second and third surfaces extending at an angle to said first surface; said second surface of said optical element constituting a reflection-transmission surface reflecting information light from said indication member toward said eyepiece.

3. A viewfinder for a single lens reflex camera, as claimed in claim 2, in which said optical element further includes a second prism for correcting the optical path; said second prism having a surface opposing and parallel to said second surface of said first-mentioned prism, and having a further surface parallel to said first surface of said firstmentioned prism.

4. A viewfinder for single lens reflex cameras, as claimed in claim 3, including a housing for said viewfinder; said indicating member being mounted within said housing on said viewfinder.

5. A viewfinder for single lens reflex cameras, as claimed in claim 1, in which said indication member is a part of a lens barrel forming a component of said reflex camera; said means forming said at least one reflection surface reflecting information light from said indication member including a further prism mounted on a part of said front surface of said pentagonal roof prism not utilized as a reflecting surface and constituted by a transparent surface, for guiding the light rays from said indication member through said pentagonal roof prism.

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Viewfinder for single lens reflex cameras including means to view exposure guides

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