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:
Mar. 15, 1994
Filed:
Feb. 02, 1993
Kunikazu Oonishi, Chigasaki, JP;
Tohru Sasaki, Yokohama, JP;
Masayuki Inoue, Yokohama, JP;
Yasuo Kitada, Odawara, JP;
Akira Saito, Odawara, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
There is disclosed an optical head device in which at least two laser beams having different wavelengths are converged as light spots on a recording medium or optical disk by use of one objective lens and one of the two laser beams is subjected to a focusing control while the recording or reproduction of a signal on or from the optical disk is made using the other laser beam. When the one laser beam is subjected to the focusing control, the deviation of a converging position of the other laser beam for the optical disk may occur due to a difference in refractive index between transparent substrates of plural kinds of optical disks. In such a case, the converging position of the other laser beam is displaced to cancel the amount of deviation.