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:
May. 06, 2003
Filed:
Sep. 08, 2000
Tomohiro Saito, Kawaguchi, JP;
Isamu Kaneko, Kawaguchi, JP;
Enplas Corporation, Saitama, JP;
Abstract
An image pickup lens system comprises a first lens which has a concave face formed on the side of an object in the vicinity of an optical axis, and which has a positive power, a diaphragm, a second lens having a negative power, and a third lens having a positive power. The first lens, the diaphragm and the second and third lenses are disposed sequentially from the side of the objects. If the image pickup lens system is formed in the above manner, a desired optical performance can be maintained, and a sufficient back focal length can be ensured, while a high telecentric property can be ensured. Moreover, various aberrations can be corrected satisfactorily, and the image pickup lens system can be produced easily.