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. 19, 2009
Filed:
Feb. 15, 2006
Daisuke Kuroda, Kanagawa, JP;
Masafumi Sueyoshi, Kanagawa, JP;
Kazuya Watanabe, Saitama, JP;
Sony Corporation, , JP;
Tamron Co., Ltd., , JP;
Abstract
There is provided a zoom lens system including at least a first lens group GRhaving a positive refractive power, a second lens group GRhaving a negative refractive power, a third lens group GRhaving a positive refractive power, a fourth lens group GRhaving a negative refractive power, a fifth lens group GRhaving a positive refractive power, and a sixth lens group GRhaving a negative refractive power, arranged sequentially from the object side. Zoom ratio is varied by changing the distance between the adjacent lens groups. The distance, taken as DW(i-j), between the i- and j-th lens groups at the wide angle end during at-infinity imaging and that, taken as DT(i-j), between the i- and j-th lens groups at the telephoto end during at-infinity imaging meet the following conditions (1), (2), (3), (4) and (5)DW(1-2)<DT(1-2)  (1)DW(2-3)>DT(2-3)  (2)DW(3-4)>DT(3-4)  (3)DW(4-5)<DT(4-5)  (4)DW(5-6)<DT(5-6)  (5)and focusing is made by moving the fourth lens group GRaxially of the lenses.