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Single-lens reflex camera

A camera and mirror technology, applied in the configuration field of viewfinder optical system, to achieve the effect of miniaturization

Inactive Publication Date: 2008-02-13
OLYMPUS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, in the single-lens reflex camera disclosed in Japanese Patent Application Laid-Open No. 11-352582, the camera is further enlarged in the thickness direction.

Method used

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Embodiment Construction

[0015] Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

[0016] In this embodiment, the movable mirror is disposed so as to reflect the light beam from the photographing optical system at an obtuse angle with respect to the optical axis of the photographing optical system. For example, in this embodiment, one side of the focus plate on the subject side is further away from the optical axis of the photographing optical system than the other side, and is arranged obliquely above the reflecting mirror. In addition, the focusing plate is located at a position perpendicular to the optical axis of the imaging optical system reflected by the mirror.

[0017] Fig. 1 is a perspective view of a single-lens reflex camera according to an embodiment of the present invention, Fig. 2 is a longitudinal sectional view of the single-lens reflex camera cut along a section line A of Fig. 1 , and Fig. 3 is cut along another sectio...

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Abstract

The present invention discloses a single-lens reflex camera configured such that, upon viewing a subject image through a finder optical system, a movable reflecting mirror reflects the optical axis of a light beam from a shooting optical system at an obtuse angle to guide the light beam to an optical element such as a pentamirror or a pentaprism. According to the present invention, since the light beam from the shooting optical system is reflected at the obtuse angle by the movable reflecting mirror, the overall pentagonal section as a reflective member, for example, for guiding a viewing image to an eyepiece optical system is arranged on a more rear side than that in such a structure that the light beam is reflected at right angles. This configuration of the invention can result in a reduction in camera size in the direction of the shooting optical path.

Description

[0001] This application is based on and claims priority from prior Japanese Patent Application No. 2006-217899 filed on August 10, 2006. technical field [0002] The present invention relates to a single-lens reflex camera, and in particular to the configuration of a viewfinder optical system in a single-lens reflex camera. Background technique [0003] Generally, in a single-lens reflex camera, subject light beams passing through a photographing optical system are reflected upward by a movable mirror (main mirror) on the optical axis, and formed into an image on a focusing plate. Then, the pentaprism (or pentamirror) located above the focusing plate converts the image (inverted image) into an erect image, and the subject image of the erect image is observed with the eyepiece optical system located behind the pentaprism. [0004] As mentioned above, the focusing plate and the pentaprism are located above the reflecting mirror on the optical axis of the photographing optical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B17/17G03B19/12G03B15/05G03B13/24H04N5/225
CPCG03B15/03G03B19/12
Inventor 岩濑滋
Owner OLYMPUS CORP
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