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. 29, 1989
Filed:
Jan. 21, 1988
Takayuki Hatase, Yokohama, JP;
Yoshimi Ohno, Kawasaki, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A variable focal lens device having an optical system comprising a variable power lens group and a focusing lens group disposed on one identical optical axis in which a deviation of a focusing position is resulted with an identical object when the focusing lens group is set at a predetermined focusing position from a nearest position to an infinite position on the optical axis corresponding too an object distance from a nearest distance to an infinite distance and then moving the variable power lens group along the optical axis thereby renewing an entire system focal length of the variable power optical system from a first focal length to a second focal length.