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:
Jan. 08, 2008
Filed:
Oct. 15, 2003
Syunsuke Kimura, Nishinomiya, JP;
Masayuki Takahashi, Kawanishi, JP;
Yoshiharu Yamamoto, Toyonaka, JP;
Syunsuke Kimura, Nishinomiya, JP;
Masayuki Takahashi, Kawanishi, JP;
Yoshiharu Yamamoto, Toyonaka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
The present invention includes three or more lens groups. These are arranged in the order of a first lens group () that has positive refractive power and a second lens group () that has negative refractive power, as seen from the side having the longer conjugate distance, wherein a first lens () of the lenses of the second lens group (), as seen from the side having the longer conjugate distance, has positive refractive power. Thus, it is possible to suppress distortion aberration to a small value.