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. 17, 2007
Filed:
Dec. 20, 2004
Ji-yong Zeng, Beijing, CN;
Ying-bai Yan, Beijing, CN;
Guo-fan Jin, Beijing, CN;
Zhuo Wang, Beijing, CN;
Min-qiang Wang, Beijing, CN;
Ji-Yong Zeng, Beijing, CN;
Ying-Bai Yan, Beijing, CN;
Guo-Fan Jin, Beijing, CN;
Zhuo Wang, Beijing, CN;
Min-Qiang 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 includes an aperture stop (), a first lens (), and a second lens () having a concave surface on an object side. The aperture stop, the first lens and the second lens are aligned in that order from the object side to an image side. The first lens has positive refracting power and has a diffraction grating formed on a convex surface on the image side. The second lens has positive refracting power. The system satisfies the following condition: (1) 1.4<T/f<1.7, wherein f is a focal length of the system, and T is a length from the aperture stop to an image pick-up surface () of the image side. Condition (1) limits the total length of the system in order to provide compactness. The system also satisfies other conditions (2)–(5) as disclosed, in order to provide compactness, cost-effectiveness and improved optical performance.