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:
Dec. 06, 1994
Filed:
Sep. 21, 1992
Nidek Co., Ltd., , JP;
Abstract
A stereoscopic retinal camera comprises an illuminating optical system, a photographing optical system, an observation optical system and a focus detection optical system. The focusing optical system consists of an index projecting system combined with one of the two light paths of the observation optical system, and an index detecting system combined with the other light path of the observation optical system. The respective positions of the focusing lenses of the photographing optical system are adjusted so that a sharp image of the focusing index is detected by the index detecting system. Thus, the stereoscopic retinal camera can be easily focused without requiring any particular skill and is capable of enabling the minute observation of the fundus of the eye by means of a direct-vision viewfinder.