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:
Nov. 19, 1996
Filed:
Nov. 29, 1994
Applicant:
Inventor:
Kyoichi Miyazaki, Sennan, JP;
Assignee:
Minolta Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ; G03B / ;
U.S. Cl.
CPC ...
359686 ; 359676 ; 359678 ; 396379 ;
Abstract
A finder optical system of the present invention includes from the object side an objective lens system of a positive refractive power and an eyepiece system of a positive refractive power. The objective lens system includes from the object side a first lens unit of a negative refractive power, a second lens unit of a positive refractive power and a third lens unit of a positive refractive power. Zooming is performed by moving the first and second lens units. Each of the first and second lens units includes a single lens having at least one aspherical surface. The third lens unit includes a lens prism at least an incident surface of which is an aspherical surface.