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:
Jan. 30, 2001
Filed:
Sep. 16, 1999
Noboru Koizumi, Omiya, JP;
Fuji Photo Optical Co., Ltd., Omiya, JP;
Abstract
An eyepiece lens for a display image observation device is disclosed that has only six lens elements with refractive power, in the order from the eye side, as follows: a first lens group G,formed of two lens elements L,and L,, both of positive refractive power, with the lens element L,on the eye side being of positive meniscus shape with its convex surface on the eye side; a second lens group G,formed of two lens elements L,and L,which are either separated by air or cemented together, the first of the lens elements on the eye side (i.e., L,) having negative refractive power and the other having positive refractive power; and a third lens group G,formed of two lens elements which are either separated by air or cemented together, the first of the lens elements on the eye side (i.e., L,) having positive refractive power and the other having negative refractive power. Preferably, one of the surfaces of the lens elements in the first lens group G,is aspherical, and specified conditions are satisfied in order to achieve favorable aberration correction in an eyepiece lens that is compact.