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. 20, 2001
Filed:
Jul. 27, 1999
Yoshihiro Nakao, Kawasaki, JP;
Haruhiko Izumi, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A method and device for controlling a power of pulsed light is provided, which is emitted by a light source, condensed by a object lens and irradiated to a recording medium for recording information in the recording medium. In order to use the power more efficiently under the limitation of the maximum output of the light source and the maximum efficiency of condensing light in the optical system, the method includes steps of performing test writing with the pulsed light having a fixed bottom power and variable peak power, calculating an optimum average power in accordance with the bottom power and the peak power of the optimum condition obtained by the test writing step, and recalculating the peak power and the bottom power in accordance with the optimum average power so that the peak power is decreased and the bottom power is increased.