| US 7,524,073 B2 | ||
| Layered periodic structures with peripheral supports | ||
| Mamoru Miyawaki, Irvine, Calif. (US) | ||
| Assigned to Canon Kabushiki Kaisha, Tokyo (Japan) | ||
| Filed on Nov. 16, 2006, as Appl. No. 11/560,617. | ||
| Prior Publication US 2008/0117508 A1, May 22, 2008 | ||
| Int. Cl. F21V 5/02 (2006.01); F21V 9/14 (2006.01); G02B 5/18 (2006.01) | ||
| U.S. Cl. 362—19 [362/339; 359/486; 359/576] | 16 Claims |
| 1. A grating in an optical device, comprising:
a working area comprising a first periodic grating structure located in a first layer and a second periodic grating structure
located in a second layer adjacent to the first layer; and
a non-working area comprising a first support structure located in the first layer and a second support structure located
in the second layer.
wherein the first periodic grating structure and the second periodic grating structure are different from each other,
wherein the first support structure mates with the second support structure, and
wherein the first support structure mates with an additional component of the optical device.
|