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:
Apr. 28, 2009
Filed:
Nov. 16, 2006
Mamoru Miyawaki, Irvine, CA (US);
Mamoru Miyawaki, Irvine, CA (US);
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A grating for an optical device. The grating includes a working area comprising a periodic grating structure and a non-working area comprising a support structure for mating with an additional component of the optical device. The support structure supports the additional component in order to prevent strains from developing in the grating. The strains may come from physical stresses applied to the optical device during manufacturing or use or may come from changes in the temperature of the optical device. The support structure may operate by providing an element whose width to height ratio is greater than a width to height ratio of the elements in the grating structure. The support structure may also operate by being higher than the working area of the grating. Furthermore, the non-working area of the grating may include alignment marks used during the manufacturing of the optical device.