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. 04, 1994
Filed:
Jul. 24, 1992
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
An optical magnetic disk recording/reproducing apparatus is capable of reproducing address data when recording data signals on a magneto-optical disk and when deleting data signals from a magneto-optical disk. The reproduction of address data is performed with a high degree of stability. The apparatus includes an optical head, photoelectric voltage converters, various adders, a differential device and several switches. A first switch switches between a first position in which an output of the first switch is connected to the output of the differential device and a second position in which the output of the first switch is connected to a reference voltage. A second switch includes a first position in which an output of the second switch is connected to the output of one of the adders and a second position in which an output of the second switch is connected to the output of the first switch. Several control signal generators control the switches. Thus, the first switch outputs a signal from a differential amplifier during data reproduction and outputs a reference voltage during data recording and erasing.