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:
Jul. 06, 1993
Filed:
Mar. 28, 1991
Youichi Konno, Saitama, JP;
Pioneer Electronic Corporation, Tokyo, JP;
Abstract
A magneto-optical recording and reproducing device in which recording is carried out by applying a modulated laser beam and a bias magnetic field to a recording point of a magneto-optical recording disc and erasing is carried out by reversing a direction of the bias magnetic field and continuously applying a laser beam to the recording point. The device includes an electromagnet (2) for applying the bias magnetic field, a carriage (3) on which a laser for irradiating the laser beam is mounted, an actuator including magnets (4) and coils (5) for controlling the focal point of the laser beam, a linear motor including magnets (7), yokes (8) and coils (6) for linearly moving the carriage (3). In one embodiment, the polarities of the magnets (4, 7) of the actuator and linear motor, respectively, are arranged such that a direction of the magnetic field of the actuator is opposite to that of the linear motor so as to minimize the resulting magnetic flux. In another embodiment, the magnets (7) of the linear motor are arranged such that the polarities of the magnets are opposite one another to form a closed magnetic path.