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. 15, 1990
Filed:
Dec. 16, 1988
Hiroshi Taniura, Ibaragi, JP;
Think Laboratory Co., Ltd., Chiba, JP;
Abstract
An optical beam splitter including a prescribed number of stacked transparent parallel plates whose thicknesses are uniform to a high degree of precision, the back surface of the transparent parallel plate which is the farthest from the side at which light beam that is to be split enters is coated with a totally reflective film, while the back surfaces of all of the remaining transparent parallel plates are coated with different semi-reflective film whose respective reflectivities gradually increase and the coating region of the totally reflective film and semi-reflective films are positioned in an oblique arrangement which is struck by the light beam traveling obliquely through the interiors of the transparent parallel plates. With this optical beam splitter, the incident light beam is converted into a number of split light beams which are of equal luminous intensity by partial reflection by the respective semi-reflective films and total reflection by the totally reflective film, and the respective split light beams are emitted parallel to each other in a row in the direction of the side of the stack from which the incident light beam initially entered without any of the split light beams striking the preceding semi-reflective films.