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:
May. 22, 2001
Filed:
Sep. 23, 1998
Michio Cho, Saitama, JP;
Takashi Tanaka, Saitama, JP;
Other;
Abstract
A real image finder comprises an objective lens system including a convex lens and having a positive power as a whole, an erect image prism having four reflection surfaces and inverting an inverted image of an object formed through the objective lens system in horizontal and vertical directions, and an eyepiece having a positive power, wherein the erect image prism and the eyepiece lens is integrated by forming an eyepiece surface on the image side of the erect image prism. To provide a fixed magnification finder, the objective lens system consists of a single lens having a positive power and at least one aspherical surface. To provide a zoom finder, the objective lens system comprises a first lens with a negative power and a second lens with a positive power arranged in this order from the object side. The second lens is moved along the optical axis for zooming.