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:
May. 14, 1991
Filed:
Jul. 19, 1989
Applicant:
Inventors:
Shigeru Nakamura, Hachioji, JP;
Sadao Takahashi, Nagaoka, JP;
Masateru Watanabe, Kanagawa, JP;
Akira Arimoto, Musashimurayama, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ; G11B / ;
U.S. Cl.
CPC ...
369112 ; 369100 ; 350421 ;
Abstract
Prism optics for changing the shape of a light beam, including a composite prism consisting of at least two types of prisms made of materials having different variations in the refractive index due to variations of the refractive index due to wavelength variations and to temperature variations, which materials are so chosen that the angle of the light beam exitting from the prism optics remains almost constant, independent of variations in the wavelength of the light beam and temperature, and an optical information processing apparatus using these prism optics.