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:
Mar. 09, 2021
Filed:
May. 19, 2017
Applicant:
Konica Minolta, Inc., Tokyo, JP;
Inventors:
Assignee:
Konica Minolta, Inc., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 21/00 (2006.01); G02B 1/115 (2015.01); C03C 17/34 (2006.01); G02B 3/00 (2006.01); G03B 21/14 (2006.01);
U.S. Cl.
CPC ...
G02B 1/115 (2013.01); C03C 17/3423 (2013.01); G02B 3/0037 (2013.01); G02B 3/0087 (2013.01); G03B 21/14 (2013.01);
Abstract
A projection lens for projecting an image onto a projection plane includes: a lens substrate; and an antireflective film disposed on a surface of the lens substrate. The antireflective film includes, in order starting from an air side of the antireflective film, a first layer, second layer, third layer, fourth layer, fifth layer, sixth layer, seventh layer, and eighth layer. The first layer is formed of MgF. Each of the second layer, the fourth layer, the sixth layer, and the eighth layer has a refractive index of 2.0 to 2.3. Each of the third layer, the fifth layer, and the seventh layer is formed of SiO.