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:
May. 04, 1999
Filed:
Feb. 06, 1997
Akihiko Doi, Tokyo, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
In an optical disk device with various types of optical disks, the amounts of light are set for the various types of optical disks by emitting laser light from a semiconductor laser oscillator while sequentially increasing the light amount thereof for the optical disks in an order from the optical disk of the smallest set light amount. That is, first, whether or not an optical disk of CD, CD-ROM or DVD-ROM can be suitably used is determined based on the amount of reflection light from the optical disk obtained by causing the semiconductor laser oscillator to emit laser light in the smallest light amount setting state, and if it is not determined that the optical disk can be suitably used, the light amount is raised to a level higher than the lowest light amount set level by one level.