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:
Aug. 17, 2004
Filed:
Aug. 22, 2000
Yumiko Kato, Kawasaki, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A viewfinder optical system includes an objective lens unit, an image inverting unit for converting an object image formed via the objective lens unit into a non-inverted erecting image, and an eyepiece lens unit for observing the non-inverted erecting image, wherein the image inverting unit comprises a first transparent body and a second transparent body which are disposed with an interval put therebetween, the second transparent body having only a function of transmitting a ray of light, and wherein the interval between the first transparent body and the second transparent body is not uniform. Further, a viewfinder optical system includes an objective lens unit, an image inverting unit for converting an object image formed via the objective lens unit into a non-inverted erecting image, and an eyepiece lens unit for observing the non-inverted erecting image, wherein the image inverting unit comprises a first transparent body and a second transparent body which are disposed with an interval put therebetween, the second transparent body having only a function of transmitting a ray of light, and wherein at least one of surfaces of the first transparent body and the second transparent body is a rotationally-asymmetrical surface.