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. 20, 1989
Filed:
Dec. 28, 1987
Yoshichi Ohtake, Kamakura, JP;
Abstract
An optical zooming system comprising a zoom lens device for varying the focal length of the zooming system by its own movement in directions of the optical axis thereof and a cylindrical cam device arranged to encase the zoom lens. The zoom lens device has an engaging pin at its peripheral surface which is engaged with a cam groove formed at the inner circumferential surface of the cylindrical cam device to be movable along the cam groove. The cylindrical cam device is coupled to a drive device to be rotated so that the zoom lens device is moved in the optical axis directions in response to the rotation of the cylindrical cam device. The cam groove has a configuration formed so that the focal length of the zooming system is varied in linear relationship to the angle of rotation of the cylindrical cam device.