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. 01, 2013
Filed:
Apr. 01, 2011
Nobuyuki Miyazawa, Utsunomiya, JP;
Yasuaki Hagiwara, Utsunomiya, JP;
Nobuyuki Miyazawa, Utsunomiya, JP;
Yasuaki Hagiwara, Utsunomiya, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An eyepiece lens includes, in order from an image display surface side to an observer side, a positive first lens, a negative second lens, and a positive third lens. A surface on the image display surface side of the positive first lens has a refractive power stronger than a refractive power of an opposite surface thereof. The negative second lens has a meniscus shape, and a surface on the image display surface side of the negative second lens has a convex shape. Both surfaces of the positive third lens have a convex shape. In the eyepiece lens, during diopter adjustment, the first through the third lenses move along an optical axis. A focal length (f) of the entire eyepiece lens and a diagonal length (H) of the image display surface satisfy the following conditions:0.45<<0.70, and21.0 (mm)<<29.0 (mm).