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:
Oct. 19, 2010
Filed:
Dec. 21, 2007
Junichi Nio, Chiba, JP;
Junichi Nio, Chiba, JP;
SEIKO Precision Inc., , JP;
Abstract
An imaging lens comprises a first lens (L), a second lens (L), a third lens (L), and a fourth lens (L), which are arranged in ascending sequence, starting from the lens nearest to the object. The first lens (L) has a double-convex shape and positive refractive power. The second lens (L) has a double-concave shape and negative refractive power. The third lens (L) has a meniscus shape with its convex surface facing an image plane, and has positive refractive power. The fourth lens (L) has a meniscus shape with its convex surface facing the object. A chromatic aberration occurred in the first lens (L) is corrected by the second lens (L). A chromatic aberration occurred in the third lens (L) is corrected by the fourth lens (L).