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:
Feb. 12, 1991
Filed:
Jun. 03, 1988
Hiroshi Fuji, Tenri, JP;
Tomiyuki Numata, Tenri, JP;
Tsuneo Fujiwara, Tenri, JP;
Kentaroh Tsuji, Nara, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
A magneto-optic record signal processing system uses a linearly polarized light beam to be projected onto a magneto-optic medium and a recorded signal is reproduced by analyzing the polarized conditions of a reflected light beam from the medium. This processing system also includes a recording face identifying device for determining the recording face of the magneto-optic record medium. To determine the recording face, an initialized area projecting device projects a light beam onto an initialized area of a magneto-optic record medium. A transducing circuit then converts a slant in a polarization plane of a reflected light beam from the initialized area into a light intensity. A photo-detector detects the light intensity outputted from the transducing means and a comparator compares the output from the photo-detector with a reference level to determine the magnetization of the recording face.