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:
Jan. 21, 1997
Filed:
Mar. 21, 1995
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
An object of the present invention is to enhance the transmission efficiency of light signals. An output end of a light guide is coupled to a light receiving portion of a semiconductor substrate with an optical coupling agent. Reflection preventing films of silicon dioxide are formed on both the output end and the input end of the light guide. Similar reflection preventing films are formed on both surfaces of a light introducing window provided at the input end of the light guide, too. The light introducing window is provided to maintain the inside of the device airtight while enabling passage of light signals. Since the reflection preventing films are formed, the transmission efficiency of light signals is high, so that the sensitivity of the device increases.