The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 14, 2000
Filed:
May. 28, 1998
Tetsuji Shono, Tokyo, JP;
Asahi Kogaku Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
In a viewfinder optical system in a thin-type camera, the following are provided: first to fourth lenses for effecting image-forming operation; a first reflecting mirror for bending a principal optical axis 90 degrees in a heightwise direction of a camera; a second reflecting mirror for bending thin bent optical axis 90 degrees in a widthwise direction of the camera; a third reflecting mirror for bending this bent optical axis 90 degrees in an opposite direction to the heightwise direction of the camera; and a fourth reflecting mirror for bending this bent optical axis 90 degrees in a direction parallel with the principal optical axis. Despite the fact that the camera is made thin, its optical path length can be made long, and it is possible to form a viewfinder optical system having a high magnification of the viewfinder or a viewfinder optical system having a zooming structure.