US 12,320,701 B2
Filter array and imaging system
Motoki Yako, Osaka (JP); and Atsushi Ishikawa, Osaka (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
Filed on Feb. 1, 2023, as Appl. No. 18/162,730.
Application 18/162,730 is a continuation of application No. PCT/JP2021/028235, filed on Jul. 30, 2021.
Claims priority of application No. 2020-140906 (JP), filed on Aug. 24, 2020.
Prior Publication US 2023/0168126 A1, Jun. 1, 2023
Int. Cl. G01J 3/28 (2006.01); G01J 3/26 (2006.01); G01J 3/36 (2006.01); G01J 3/51 (2006.01); G02B 5/20 (2006.01); G02B 5/26 (2006.01); G02B 5/28 (2006.01); H04N 23/12 (2023.01); H04N 25/13 (2023.01); H10F 39/00 (2025.01)
CPC G01J 3/2823 (2013.01) [G01J 3/26 (2013.01); G01J 3/36 (2013.01); G01J 3/513 (2013.01); G02B 5/20 (2013.01); G02B 5/201 (2013.01); G02B 5/26 (2013.01); G02B 5/28 (2013.01); G02B 5/288 (2013.01); H04N 25/134 (2023.01); H10F 39/8053 (2025.01); G01J 2003/2806 (2013.01); G01J 2003/2826 (2013.01); G01J 2003/283 (2013.01); G01J 2003/516 (2013.01); H04N 23/12 (2023.01)] 17 Claims
OG exemplary drawing
 
1. A filter array comprising:
optical filters that are arranged in two dimensions, wherein
the optical filters include a first filter and a second filter,
the first filter includes
a first multimode filter that has, within a target wavelength range, first peak wavelengths at each of which an optical transmittance is at a local maximum, and
a first band-limiting filter that restricts transmission of light in a first sub-wavelength range that is a part of the target wavelength range, and
the second filter includes
a second multimode filter that has, within the target wavelength range, second peak wavelengths at each of which an optical transmittance is at a local maximum, at least one of the second peak wavelengths being different from the first peak wavelengths, and
a second band-limiting filter that restricts transmission of light in a second sub-wavelength range that is a part of the target wavelength range and that is different from the first sub-wavelength range,
first transmitted light that has passed through the first multimode filter and the first band-limiting filter has at least two peak wavelengths in the target wavelength range, and
second transmitted light that has passed through the second multimode filter and the second band-limiting filter has at least two peak wavelengths in the target wavelength range.