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:
Aug. 19, 2025
Filed:
Aug. 04, 2021
Applicant:
Konica Minolta, Inc., Tokyo, JP;
Inventors:
Assignee:
KONICA MINOLTA, INC., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 5/28 (2006.01); G01J 3/02 (2006.01); G01J 3/18 (2006.01); G01J 3/26 (2006.01); G01J 3/28 (2006.01); G02B 26/02 (2006.01);
U.S. Cl.
CPC ...
G01J 3/02 (2013.01); G01J 3/0208 (2013.01); G01J 3/0256 (2013.01); G01J 3/26 (2013.01); G01J 3/2803 (2013.01); G02B 5/28 (2013.01); G02B 26/02 (2013.01); G01J 3/18 (2013.01);
Abstract
The photometric device includes a variable light attenuator. The variable light attenuator includes a plurality of light attenuation filters and a driving device. Each of the plurality of light attenuation filters includes an interference multilayer film and a transparent substrate. A combination of any two of the plurality of light attenuation filters is set as a first light attenuation filter and a second light attenuation filter. A first optical path length of the first transparent substrate of the first light attenuation filter is different from a second optical path length of the second transparent substrate of the second light attenuation filter.