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. 13, 1996
Filed:
Jun. 06, 1995
Yasuhiro Miyazaki, Akigawa, JP;
Olympus Optical Co., Ltd., Tokyo, JP;
Abstract
The optical head includes a light source, a reflection mirror for bending the light flux from the light source to an information recording medium, an outward and inward path light separating element for separating an outward path light incident on the recording medium through the reflection mirror and an inward path light reflected on the recording medium, an objective lens for condensing the outward path light on the recording medium, a semiconductor substrate having a semiconductor crystal layer with inclined surfaces and plane surfaces adjacent to the inclined surface, and at least one pair of photodiodes embedded in the inclined surface and the plane surface, respectively. The inward path light emanated from the outward and inward path light separating element is incident on one of these photodiodes, thereby photo-electrically converting the incident light into electrical signals. The inward path light reflected on the one photodiode is incident on the other of the photodiodes, thereby photo-electrically converting the incident light into electrical signals, resulting in acquisition of information signals and servo signals based on these photoelectrically converted signals.