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. 27, 1991
Filed:
Jun. 05, 1990
Applicant:
Inventors:
Makoto Sato, Fussa, JP;
Tatsuo Shimazaki, Tokyo, JP;
Assignee:
Casio Computer Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
359638 ; 359601 ; 359589 ;
Abstract
An elongated X-shaped prism comprising an X-shaped combination of four transparent plates and one central rectangular solid block member. The four transparent plates are disposed in an X-shaped state and each has one side edge adhered to a corresponding side-face of the central member, the width of each side-face of the central member being equal to thickness of each of the four transparent plates. The central member has a refraction index which is higher than the refraction index of the transparent plates. One side surface of the transparent plates is coated with an optical layer.