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Optical instrument and method for manufacturing optical instrument

The technology of an optical instrument and manufacturing method, which is applied in the field of viewfinder optical system, can solve problems such as difficulty in acquisition and difficulty in uniform acquisition

Inactive Publication Date: 2011-12-07
NIKON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, if the optical axis of the light meter is inclined relative to the optical axis of the viewfinder, it is difficult to uniformly acquire light from the focal plane on the light meter, and to acquire light from the entire surface of the focal plane (that is, the photographing range all light in ) is also difficult

Method used

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  • Optical instrument and method for manufacturing optical instrument
  • Optical instrument and method for manufacturing optical instrument
  • Optical instrument and method for manufacturing optical instrument

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Embodiment Construction

[0032] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. figure 1 A single-lens reflex camera is shown, which is the optical instrument of the present invention. This single-lens reflex camera 1 includes an objective lens 11 , a quick-return mirror 13 , an image sensor 14 for taking pictures, and a viewfinder optical system 20 . The viewfinder optical system 20 also includes a reticle 21 , a pentaprism 25 and an eyepiece 26 arranged in this order from the object through which an image formed by the objective lens 11 on the reticle 21 can be observed.

[0033] Objective lens 11 forms an object image on image sensor 14 or reticle 21 . The quick-return mirror 13 is inserted at an angle of 45 degrees relative to the optical axis passing through the objective lens 11, usually (in a standby state before taking pictures), the quick-return mirror 13 reflects the light passing through the objective lens 11 from the objec...

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Abstract

A single lens reflex camera has a finder optical system that observes an image formed on a reticle by an objective lens, and a photometric device that measures light transmitted through the reticle via at least a part of the finder optical system, at a position shifted from an optical axis of the finder optical system. The finder optical system comprises a Fresnel lens surface which transmits light from the objective lens, and the Fresnel lens surface is positioned so that the center of the Fresnel lens surface is shifted in a direction to cross the optical axis of the finder optical system according to a position of the photometric device.

Description

[0001] This application claims the benefit of Japanese Patent Application Nos. 2007-137497 and 2008-106072, the contents of which are incorporated herein by reference. technical field [0002] The present invention relates to an optical instrument such as a single-lens reflex camera, and more particularly to a viewfinder optical system in which a Fresnel lens and a photometer are installed. Background technique [0003] Traditionally, in the viewfinder of a single-lens reflex camera, the focal plane on which a real image is formed is observed, the real image formed by the objective lens is diffused using the focal plane as a diffusion surface, and the diffused light entering a photometer positioned near the eyepiece is measured . [0004] Figure 8 An example of its configuration is shown in which, when viewing the field of view, an image of an object is formed on a focal plane 53 on a reticle through an objective lens 51, and this image is observed by an viewpoint EP (human...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03B13/06G03B7/02G02B3/08G03B7/0997
Inventor 毛利元寿
Owner NIKON CORP