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. 05, 2005
Filed:
Feb. 21, 2002
Applicant:
Masamichi Tanaka, Tokyo, JP;
Inventor:
Masamichi Tanaka, Tokyo, JP;
Assignee:
TDK Corporation, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G11B007/00 ;
U.S. Cl.
CPC ...
Abstract
A high-frequency superposition module for an optical pickup that reduces the number of devices, facilitates scale-down and allows an oscillating circuit to be turned off when a power supply for feeding a direct current to a laser diode is turned off and an optical pickup using the high-frequency superposition module. An oscillating circuit for feeding a high frequency to a laser diode comprises at least an active element and passive elements such as capacitors, resistors, and inductors. A power supply for feeding a direct current to the laser diode is also used as a power supply for the oscillating circuit.