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. 25, 2021
Filed:
Apr. 12, 2018
Applicant:
Canon Kabushiki Kaisha, Tokyo, JP;
Inventor:
Seiji Nakahara, Sakura, JP;
Assignee:
CANON KABUSHIKI KAISHA, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 9/34 (2006.01); G02B 1/04 (2006.01); G02B 3/02 (2006.01); H04N 5/232 (2006.01); H04N 5/225 (2006.01); G02B 25/00 (2006.01);
U.S. Cl.
CPC ...
G02B 9/34 (2013.01); G02B 1/041 (2013.01); G02B 3/02 (2013.01); G02B 25/001 (2013.01); H04N 5/2254 (2013.01); H04N 5/23293 (2013.01);
Abstract
In an ocular optical system including a first lens having positive refractive power, a second lens having negative refractive power, a third lens having positive refractive power, and a fourth lens having positive refractive power which are arranged in this order from an object side to an observation side, the shape and position of each lens is set appropriately to increase the angle of view and to minimize on-axis and magnification chromatic aberrations.