| US 7,586,694 B2 | ||
| Lens assembly | ||
| Shih-Han Chen, Taipei County (Taiwan); Guo-Fei Gao, Fujian (China); and Lie-Hong Li, Shanxi (China) | ||
| Assigned to Genius Electronic Optical Co., Ltd., Shiang Taichung (Taiwan) | ||
| Filed on Feb. 05, 2008, as Appl. No. 12/25,849. | ||
| Prior Publication US 2009/0195893 A1, Aug. 06, 2009 | ||
| Int. Cl. G02B 13/18 (2006.01); G02B 3/02 (2006.01); G02B 9/06 (2006.01) | ||
| U.S. Cl. 359—794 [359/717] | 3 Claims |
| 1. A lens assembly, in an order from an object side toward an image side along an optical axis thereof:
a first lens with positive refractive power having two surfaces, at least one of said two surfaces being a spherical surface;
and
a second lens having two aspheric surfaces; and
said lens assembly satisfying the following conditions:
0<|f1/f2|<2 and
0<|f2/f|<7,
wherein f is an effective focal length of the lens assembly, f1 is an effective focal length of the first lens, and f2 is an effective focal length of the second lens,
wherein said first lens is a meniscus-shaped converging lens, the two surfaces of said first lens include a convex surface
facing the object side and a concave surface facing the image side,
wherein said second lens is a wave-shaped converging lens having positive refractive power, one of the two aspheric surfaces
of said second lens has a centered convex portion facing the object side, and the other of the two aspheric surface has a
centered concave portion facing the image side.
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