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:
Mar. 23, 2004
Filed:
Dec. 11, 2002
Yasuhisa Kitaoka, Tokushima, JP;
Yukihiro Takabatake, Ehime, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A zoom lens system with temperature compensation function includes the first lens group having a positive refractive power, the second lens group that has negative refractive power and moves along an optical axis, the third lens group having a plastic lens of positive refractive power, the fourth lens group that has positive refractive power and moves along the optical axis, the first lens barrel which extends from the first lens group to the third lens group, and the second lens barrel which extends from the third lens group to an image pickup element, and expansion or contraction of at least one of lens barrels in accordance with temperature change cancels variation of image location caused by temperature change of the lens groups.