| US 7,492,534 B2 | ||
| Imaging optical system including optical element having discontinuous plane | ||
| Kouei Hatade, Osaka (Japan); and Norihisa Sakagami, Osaka (Japan) | ||
| Assigned to Nalux Co., Ltd., Osaka (Japan) | ||
| Appl. No. 11/661,864 PCT Filed Sep. 01, 2005, PCT No. PCT/JP2005/016040 § 371(c)(1), (2), (4) Date Jun. 08, 2007, PCT Pub. No. WO2006/025505, PCT Pub. Date Mar. 09, 2006. |
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| Claims priority of application No. 2004-256573 (JP), filed on Sep. 03, 2004. | ||
| Prior Publication US 2008/0068731 A1, Mar. 20, 2008 | ||
| Int. Cl. G02B 9/00 (2006.01) | ||
| U.S. Cl. 359—796 [359/741; 359/742; 359/743; 359/718; 359/719] | 15 Claims |
| 1. An imaging optical system which has at least one lens, at least one surface of the at least one lens being divided into
at least one band region surrounding a periphery of an optical axis and a center region including the optical axis,
wherein a boundary between the at least one band region and the center region is defined by a circle having the center located
on the optical axis and a step is provided at the boundary such that a meridional image plane is brought close to a reference
image plane of the imaging optical system.
|