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:
Feb. 20, 2007
Filed:
Oct. 29, 2004
Zhuo Wang, Beijing, CN;
Guo-fan Jin, Beijing, CN;
Min-qiang Wang, Beijing, CN;
Ji-yong Zeng, Beijing, CN;
Ying-bai Yan, Beijing, CN;
Zhuo Wang, Beijing, CN;
Guo-Fan Jin, Beijing, CN;
Min-Qiang Wang, Beijing, CN;
Ji-Yong Zeng, Beijing, CN;
Ying-Bai Yan, Beijing, CN;
Tsinghua University, Beijing, CN;
Abstract
An image pick-up lens system includes an aperture stop (), a biconvex first lens (), and a meniscus-shaped second lens () having a concave surface on a side of an object. The aperture stop, the first lens and the second lens are aligned in that order from the object side to an image side. Each of the lenses has at least one aspheric surface, and at least one of the lenses is made from an optical glass. The system satisfies the following condition: (1) 1<T/f<1.6, 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. The first condition (1) limits the total length of the system in order to provide compactness. The system also satisfies other conditions (2)–(6) as disclosed, in order to provide compactness, improved optical performance, and cost-effectiveness.