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:
Feb. 23, 2010
Filed:
Nov. 06, 2006
Yuichi Atarashi, Hachioji, JP;
Kohei Ota, Hachioji, JP;
Junji Hashimura, Sagamihara, JP;
Kiyono Ikenaka, Hino, JP;
Yuichi Atarashi, Hachioji, JP;
Kohei Ota, Hachioji, JP;
Junji Hashimura, Sagamihara, JP;
Kiyono Ikenaka, Hino, JP;
Konica Minolta Opto, Inc., Tokyo, JP;
Abstract
An optical pickup apparatus for information recording and/or reproduction on different optical information recording media with compatibility among these media, the optical surface of a first objective lens and the optical surface of a second objective lens are formed only of a refractive surface. The second objective lens is used in common for the first light flux with a wavelength of λand the second light flux with a wavelength of λbut in the case where the protective substrate tof the second optical information recording medium and the protective substrate tof the third optical information recording medium are the same, it is not necessary to take the difference in thickness of the protective substrate into consideration. Chromatic aberration based on the difference in wavelength between the first light flux and the second light flux can be corrected by displacing the second coupling lens.