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. 27, 2012
Filed:
Nov. 12, 2010
Jiro Hashizume, Toride, JP;
Yoshiaki Yamauchi, Omitama, JP;
Tatsuro Ide, Kawasaki, JP;
Koichi Watanabe, Hachioji, JP;
Jiro Hashizume, Toride, JP;
Yoshiaki Yamauchi, Omitama, JP;
Tatsuro Ide, Kawasaki, JP;
Koichi Watanabe, Hachioji, JP;
Hitachi Consumer Electronics Co., Ltd., Tokyo, JP;
Abstract
A pickup and a drive, in a small size, having a spherical aberration correction device capable of correcting various spherical aberration, and coma aberration and/or astigmatism with a low power consumption. A variable-focus lens actuator can correct spherical aberration such that a transparent deformation film warps into a parabolic shape when a magnetic field is applied thereto, thereby changing the light intensity distribution of transmitted light. Further, the variable-focus lens actuator can correct coma aberration and/or astigmatism by arbitrarily tilting the transparent film to change the proceeding direction of the transmitted light.