US 12,216,268 B2
Filter unit, filter selection method, and imaging device
Takuma Tanae, Kanagawa (JP); and Hideki Nakamaru, Kanagawa (JP)
Assigned to SONY GROUP CORPORATION, Tokyo (JP)
Filed by SONY GROUP CORPORATION, Tokyo (JP)
Filed on Feb. 27, 2023, as Appl. No. 18/175,391.
Application 18/175,391 is a continuation of application No. 16/964,592, granted, now 11,592,661, previously published as PCT/JP2019/002403, filed on Jan. 25, 2019.
Claims priority of application No. 2018-021662 (JP), filed on Feb. 9, 2018.
Prior Publication US 2023/0204940 A1, Jun. 29, 2023
Int. Cl. G02B 26/02 (2006.01); G02B 5/20 (2006.01); G02B 26/00 (2006.01); G02B 27/28 (2006.01)
CPC G02B 26/023 (2013.01) [G02B 5/205 (2013.01); G02B 26/008 (2013.01); G02B 27/281 (2013.01); G02B 27/288 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A filter unit, comprising:
a disk provided with a plurality of filters including a neutral density (ND) filter and having a continuously variable transmittance, wherein
the ND filter is a polarization filter,
the polarization filter has a non-circular shape whose longitudinal direction is in a rotation direction of the disk, and
the filter unit is provided between an imaging unit and an ultraviolet cut filter that blocks ultraviolet components contained in an incident light.