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:
Dec. 17, 1991
Filed:
Oct. 17, 1990
Yasuo Idei, Tama, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
To form a semiconductor light emitting element provided with three light emitting portions into a monolithic structure, the element of double heterojunction structure has a p-type GaAs semiconductor substrate, an n-type GaAlAs current restriction layer formed with conductive regions arranged at regular intervals, a p-type GaAlAs cladding layer, a p-type GaAlAs active layer, an n-type GaAlAs cladding layer, and two grooves formed extending from the surface of the n-type GaAlAs cladding layer deep through the p-type GaAlAs active layer and between the two adjacent conductive regions. Since the three light emitting portions are formed at precise intervals in a monolithic structure, when mounted on a camera for use with an automatic focusing mechanism, it is possible to measure a distance to a subject in trigonometrical survey without the subject being out of focus.