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:
Jul. 05, 2016
Filed:
Feb. 01, 2013
Kenji Matsumoto, Tokyo, JP;
Ayano Tanabe, Tokyo, JP;
Masafumi Yokoyama, Tokyo, JP;
Nobuyuki Hashimoto, Saitama, JP;
Makoto Kurihara, Saitama, JP;
Kenji Matsumoto, Tokyo, JP;
Ayano Tanabe, Tokyo, JP;
Masafumi Yokoyama, Tokyo, JP;
Nobuyuki Hashimoto, Saitama, JP;
Makoto Kurihara, Saitama, JP;
CITIZEN HOLDINGS CO., LTD., Tokyo, JP;
Abstract
A phase modulation device corrects wave front aberrations generated by an optical system including an objective lens disposed on an optical path of a light flux. The phase modulation device includes a phase modulation element which includes a plurality of electrodes, and modulates the phase of the light flux in accordance with a voltage applied to each electrode, and a control circuit which controls the voltage to be applied to each electrode. The control circuit controls the voltage to be applied to each electrode in such a manner that the light flux is imparted with a phase modulation amount in accordance with a phase modulation profile having a polarity opposite to the polarity of a phase distribution to be determined according to a relational equation representing a relationship between a numerical aperture of the objective lens and a ratio between third-order spherical aberration and fifth-order spherical aberration.