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. 17, 1992
Filed:
Sep. 27, 1989
Susumu Takahashi, Kunitachi, JP;
Yoshinao Oaki, Hachiouji, JP;
Akira Takano, Hachiouji, JP;
Hirofumi Miyanaga, Hachiouji, JP;
Hisanari Shimazu, Akishima, JP;
Kimihiko Nishioka, Hachiouji, JP;
Akitoshi Toda, Kinitachi, JP;
Yoshisada Aoki, Hachiouji, JP;
Olympus Optical Co., Ltd., Tokyo, JP;
Abstract
An objective optical system is provided with at least one liquid crystal lens whose polarizing characteristic selected in a direction such that polarizing components of light reflected from the lens are counterbalanced and a variable liquid crystal stop is arranged at an angle with respect to an optical axis so that an incident direction of light is deviated to the side on which contrast between transmission and blocked states of light is maximized. The objective optical system enables the balance of the polarizing components to bring about a proper image for observation, can moderate asymmetry, relative to the optical axis, of the contract between the transmission and blocked states of light of the liquid crystal stop, and can secure an adjustable object image.