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. 01, 2001
Filed:
Oct. 28, 1998
Applicant:
Inventors:
Mayumi Masui, Tokyo, JP;
Mitsuru Hagimoto, Tokyo, JP;
Assignee:
Oki Electric Industry Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 5/04 ; B29D 1/100 ;
U.S. Cl.
CPC ...
G02B 5/04 ; B29D 1/100 ;
Abstract
The bottom surfaces of an entering surface-forming portion,for forming a light-entering surface,of a reflector type prism,and of an emitting surface-forming portion,for forming a light-emitting surface,of the reflector type prism,are formed as concave surfaces in a die,. Even if shrinkage of the reflector type prism,occurs during its formation, the light-entering surface,and the light-emitting surface,are, at least, not formed as concave surfaces, so that a light beam entering the reflector type prism,and a light beam emitted from the reflector type prism,are prevented from becoming scattered.