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. 18, 2014
Filed:
May. 13, 2009
Akiko Murata, Osaka, JP;
Yuka Okada, Hyogo, JP;
Akiko Murata, Osaka, JP;
Yuka Okada, Hyogo, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A diffractive optical element according to the present invention includes: a bodybeing composed of a first optical material containing a first resin, and having a diffraction gratingon a surface thereof; and an optical adjustment layerbeing composed of a second optical material containing a second resin, and provided on the bodyso as to cover the diffraction grating. The first optical material has a refractive index which is smaller than a refractive index of the second optical material; the refractive index of the first optical material has a wavelength dispersion which is greater than a wavelength dispersion of the refractive index of the second optical material; and a difference in solubility parameter between the first resin and the second resin is no less than 0.8 [cal/cm]and no more than 2.5 [cal/cm].