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. 25, 2004
Filed:
Jul. 21, 2000
Haruhiko Izumi, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
P-polarized parallel rays are irradiated on a magneto-optical disk and reflected. The reflected light is reflected by a first beam splitter and supplied to a reproduced signal detection system . This reflected light is supplied to a light shading plate , and a p-polarized component is transmitted at a transmittance of substantially 100% and an s-polarized component is transmitted at a transmittance of substantially 0%, i.e., reflected or absorbed so as to be shaded, in the area of a polarization film . The light transmitted through the light shading plate incides on a polarization beam splitter where it is split into the p-polarized component and s-polarized component, and a reproduced signal is detected by differential detection. Since the outputs of photodiodes and are not proportional to the amplitude of light but are proportional to the power of light, the reproduced signal itself is magnified with an increase in the amount of light transmitted through the light shading plate , and the S/N is improved.