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:
Mar. 04, 2008
Filed:
Sep. 08, 2005
Ji-yong Zeng, Beijing, CN;
Ying-bai Yan, Beijing, CN;
Guo-fan Jin, Beijing, CN;
Min-qiang Wang, Beijing, CN;
Zhuo Wang, Beijing, CN;
Ji-Yong Zeng, Beijing, CN;
Ying-Bai Yan, Beijing, CN;
Guo-Fan Jin, Beijing, CN;
Min-Qiang Wang, Beijing, CN;
Zhuo Wang, Beijing, CN;
Tsinghua University, Haidian District, Beijing, CN;
Hon Hai Precision Industry Co., Ltd., Tu-Cheng, Taipei Hsien, TW;
Abstract
An image pick-up lens system from an object side to an image side includes an aperture stop (), and a meniscus-shaped lens () having a concave surface on the object side and a convex surface on the image side. The lens has at least one aspheric surface and a diffraction grating provided on the convex surface thereof. The lens system satisfies the following condition: (1) 0.1<R2/R1<0.5, wherein, R1 is an absolute value of a radius of curvature of the concave surface of the lens, and R2 is an absolute value of a radius of curvature of the convex surface of the lens. Condition (1) governs a distribution of refracting power for the lens, in order to correct monochromatic aberrations. The lens system also satisfies other conditions (2)-(4) as disclosed, in order to provide compactness, cost-effectiveness and improved optical performance.