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:
Sep. 01, 1987
Filed:
Apr. 05, 1985
Akihiro Takagi, Kawasaki, JP;
Kiyoshi Kimoto, Tokyo, JP;
Nippon Kogaku K. K., Tokyo, JP;
Abstract
In an apparatus for irradiating a magnetooptical recording medium with a linearly polarized light beam and detecting the light from the medium, the light from the magnetooptical recording medium is divided, depending on the degree of the plane of polarization, into two light beams of different intensities which are respectively converted into electrical signals for supply to a differential amplifier, wherein an electrical signal corresponding to a light beam is amplified in order to eliminate the noise component in the output signal of the differential amplifier. In addition, the apparatus is so constructed that the amplification of the electrical signal corresponding to a divided light beam is controlled in response to the electrical signals corresponding to the divided light beams.