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:
Jun. 23, 1998
Filed:
Oct. 18, 1996
Syunji Nishimura, Ohmiya, JP;
Fuji Photo Optical Co., Ltd., , JP;
Abstract
A driving mechanism is disclosed for photographic lens having a stationary lens barrel, a first driving lens barrel adapted to be rotated and moved back and forth relative to the stationary lens barrel, a second driving lens barrel operatively associated with the first driving lens barrel by the aid of a rotation transmitting structure so as to be rotated and moved back and forth relative to the first driving lens barrel, and a movable lens barrel holding a front lens group and being movable back and forth relative to the second driving lens barrel. With this arrangement, power varying or focusing is achieved with a relatively small-sized lens barrel assembly by moving a rear lens group back and forth under a regulating action of the second driving lens barrel. The first driving lens barrel is rotatably received by and operatively associated with the stationary lens barrel through helicoids formed on these two lens barrels. The second driving lens barrel is rotatably received by and operatively associated with the first driving lens barrel through helicoids formed on these two lens barrels. The movable lens barrel is received by and operatively associated with the second driving lens barrel through helicoids formed on these two lens barrels. Rotation of the first driving lens barrel is transmitted by gears to the second driving lens barrel so as to rotate the second driving lens barrel in a direction opposite to that in which the first driving lens barrel rotates.