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:
Aug. 11, 2009
Filed:
Aug. 25, 2003
Toshihiko Ushiro, Itami, JP;
Soichiro Okubo, Itami, JP;
Takashi Matsuura, Itami, JP;
Sumitomo Electric Industries, Ltd., Osaka, JP;
Abstract
Practical diffractive optical elements are made available efficiently and at low-cost. A refractive-index-modulated diffractive optical element includes a transparent DLC (diamond-like carbon) film () formed on a transparent substrate (), with the DLC film () containing a diffraction grating having local regions () of a relatively high refractive index and local regions () of a relatively low refractive index. The DLC film () can readily be deposited by plasma CVD onto the substrate (), and the high refractive-index regions () within the DLC film can readily be formed by irradiating it with an energy beam () such as an ion beam.