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:
Nov. 10, 1987
Filed:
Oct. 16, 1986
Saburo Funada, Hamura, JP;
Yoshiro Yoda, Tama, JP;
Shoji Yoshikawa, Hachioji, JP;
Masanori Doi, Akishima, JP;
Kazutake Sugawara, Hachioji, JP;
Olympus Optical Co., Ltd., Tokyo, JP;
Abstract
The optical recording and reproducing apparatus comprises a magnetic field applying section, a movable mechanism for moving the magnetic field applying section, a distance detecting section for detecting a distance between magnetic poles of the magnetic field applying section and the surface of a recording medium, and a distance control section for maintaining the above distance constant in response to an output of the distance detecting section. The distance between two magnetic pole ends of the magnetic field applying section can be minimized. Further, on the basis of the tracking control of either one of the recording and erasing light beams, it is possible to enable a high-precision tracking control to the other of the two light beams.