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:
Apr. 13, 1993
Filed:
Jan. 29, 1992
Noriyuki Iwata, Fujisawa, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A finder optical system of a camera comprises a main finder and an auxiliary finder. The main finder is constructed by a real image type finder having a main finder objective lens, an ocular lens system, and an optical system disposed between the main finder objective lens and the ocular lens system for forming an erect real image. An optical axis of the main finder objective lens is perpendicular to a vertical symmetry axis of an image pickup lens of the camera and is parallel to an optical axis of the image pickup lens. The auxiliary finder is constructed by a real image finder having an auxiliary finder objective lens and another optical system disposed between the auxiliary finder objective lens and the ocular lens system for forming an erect real image. An optical axis of the auxiliary finder objective lens is perpendicular to a lateral symmetry axis of the image pickup lens and is parallel to the optical axis of the image pickup lens. Another optical system is adapted in such a manner that an optical path of the auxiliary finder is led nearly on a real image forming plane of the main finder into a part of an optical path of the main finder.