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. 31, 2022
Filed:
Jan. 25, 2019
Applicant:
Canon Kabushiki Kaisha, Tokyo, JP;
Inventor:
Junya Ichimura, Utsunomiya, JP;
Assignee:
CANON KABUSHIKI KAISHA, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 9/12 (2006.01); G02B 27/00 (2006.01); G03B 21/14 (2006.01); H04N 5/225 (2006.01);
U.S. Cl.
CPC ...
G02B 9/12 (2013.01); G02B 27/0025 (2013.01); G03B 21/142 (2013.01); H04N 5/2254 (2013.01);
Abstract
An imaging optical system includes, in order from an enlargement conjugate side to a reduction conjugate side, a first lens unit having a positive refractive power, a second lens unit having a positive refractive power, and a third lens unit. A distance between adjacent lens units varies in focusing from a far side to a near side. An intermediate image is formed inside the second lens unit. In focusing from the far side to the near side, the second lens unit moves to the reduction conjugate side, and the third lens unit moves to the enlargement conjugate side.