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:
Apr. 27, 2004
Filed:
Apr. 21, 2000
Ichiro Uchizaki, Fujisawa, JP;
Kazuya Tsunoda, Zama, JP;
Kabushiki Kaisha Toshiba, , JP;
Abstract
An optical pickup device includes a double-source built-in semiconductor laser for emitting light of a first wavelength and light of a second wavelength, a first divergence modifying device for modifying the diverging rate of emitted light from the double-source built-in semiconductor laser to a first diverging rate, a second divergence modifying device for modifying the diverging rate of a part of transmitted light through the first divergence modifying device to a second diverging rate, and an objective lens which focalizes the light with the first wavelength modified to the first diverging rate by the first divergence modifying device onto a first optical disc, and focalizes the light with the second wavelength modified to the second diverging rate by the first and second divergence modifying devices onto a second optical disc.