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:
Oct. 18, 1977
Filed:
Dec. 19, 1975
Mitsuo Yasukuni, Osaka, JA;
Minolta Camera Kabushiki Kaisha, Osaka, JA;
Abstract
A compact varifocal lens system, such as a zoom lens assembly, is provided having a front focusing lens component of negative refractive power, a variator lens component of positive refractive power, a compensator lens component of negative refractive power and a master lens component. The lens assembly has a compact configuration and further, provides a highly desirable macrophotography capability. The macrophotography mode of operation can be effected by fixing one of the variator and compensator lens components, or by separating one of the variator and compensator lens components into positive and negative subcomponents with a predetermined relative positioning of the subcomponents to provide a close-up focusing.