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. 01, 2011
Filed:
Dec. 21, 2007
Junichi Nio, Narashino, JP;
Junichi Nio, Narashino, JP;
Seiko Precision, Inc., Chiba, JP;
Abstract
A first lens (L), a second lens (L), a third lens (L), and a fourth lens (L) are arranged in this order from an object side. The first lens (L) has a biconvex shape and a positive refracting power. The second lens (L) has a meniscus shape that is convex toward the object side, and has a negative refracting power. The third lens (L) has a meniscus shape that is convex toward an image side, and has a positive refracting power. The fourth lens (L) has a meniscus shape that is convex toward the object side, and has a negative refracting power. A chromatic aberration generated by the first lens (L) is corrected by the second lens (L). A chromatic aberration generated by the third lens (L) is corrected by the fourth lens (L).