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:
Sep. 11, 2018
Filed:
Apr. 02, 2014
Essilor International (Compagnie Generale D'optique), Charenton le Pont, FR;
Nikon Corporation, Minato-ku, Tokyo, JP;
Essilor International, Charenton le Pont, FR;
Nikon Corporation, Tokyo, JP;
Abstract
An achromatic phase modulator that modulates a phase of linearly polarized light and outputs the linearly polarized light having undergone phase modulation, comprises: at least two liquid crystal elements disposed in series on a light path of the linearly polarized light, which are constituted with liquid crystal materials with refractive index wavelength dependence characteristics thereof different from each other; and a control unit for applying specific drive electric signals individually to the liquid crystal elements so as to achieve achromatic phase modulation for the linearly polarized light, wherein a polarization direction of the linearly polarized light entering the phase modulator matches the polarization direction of the linearly polarized light exiting the phase modulator.