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:
Aug. 09, 2011
Filed:
Mar. 15, 2007
Seiji Ono, Yokosuka, JP;
Naomitsu Kuroda, Yokohama, JP;
Eiji Okubo, Yokohama, JP;
Yasushi Kinoshita, Hitachinaka, JP;
Seiji Ono, Yokosuka, JP;
Naomitsu Kuroda, Yokohama, JP;
Eiji Okubo, Yokohama, JP;
Yasushi Kinoshita, Hitachinaka, JP;
Hitachi Media Electronics Co., Ltd., Iwate, JP;
Abstract
In an optical element feeding device and an optical pickup unit using the same, in order to make the device compact and light and achieve a stable operation, the device has a main shaft and a sub shaft supporting a movable frame in which an optical element is arranged in such a manner as to be movable in a direction of an optical axis, a stepping motor, a lead screw rotating on the basis of a rotation of the stepping motor, a resin nut engaging with the lead screw and being movable in the direction of the optical axis on the basis of the rotation of the lead screw, and a spring pressing the movable frame in the direction of the optical axis so as to bring the movable frame into contact with the nut, and a cushioning material is provided between the nut and the movable frame so as to connect the nut and the movable frame.