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. 04, 2001
Filed:
May. 04, 1999
Hisashi Kano, Kumamoto, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
In order to provide an optical pickup apparatus having a structure suitable for making thin, compact and light, there is provided a yoke member having two standing plates for forming magnetic poles and a horizontal yoke plate for connecting the standing plates to each other and having a U-shaped cross section, magnets provided on surfaces in the mutually opposing sides of two standing plates, a focus coil formed by being wound in an annular shape and arranged around the standing plate in a movable manner in a height direction and two track coils formed by being wound in an annular shape, in which a size in the direction of the horizontal width of the magnet is set to be equal to or greater than a height in the standing direction of the magnet, and a size in the direction of the horizontal width of the yoke is set to be equal to or greater than a height in the standing direction of the yoke. Accordingly, it is possible to secure a cross sectional area of the magnetic circuit by increasing the size in the direction of the horizontal width of the yoke so as to set the thickness of the optical disc apparatus to be equal to or less than 10 mm.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile