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:
Aug. 10, 1999
Filed:
Mar. 31, 1998
Takashi Kato, Sakai, JP;
Minolta Co., Ltd., Osaka, JP;
Abstract
A zoom lens structure having a smaller number of assembling parts, so that the structure is more compact, and is manufactured at lower cost. A cam ring has a focusing cam slot for determing a displacement amount of a focusing lens group along an optical axis at time of focusing, and a zooming cam slot for determing a displacement amount thereof in cooperation with the focusing cam slot at time of zooming. At time of focusing, the cam ring is moved along the optical axis without rotation. The cam ring also has another slot, being formed in parallel with a direction in which the cam ring moves at time of focusing, for guiding a zooming lens group. In case that the cam ring is driven at time of focusing, the driving force is not transmitted to the zooming lens group. Therefore, it is possible to drive the focusing lens group only along the optical axis at time of focusing.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile