US 12,092,846 B2
Filter and imaging apparatus
Shigeaki Nimura, Kanagawa (JP); and Shuji Ono, Kanagawa (JP)
Assigned to FUJIFILM Corporation, Tokyo (JP)
Filed by FUJIFILM Corporation, Tokyo (JP)
Filed on Jan. 10, 2022, as Appl. No. 17/572,556.
Application 17/572,556 is a continuation of application No. PCT/JP2020/024551, filed on Jun. 23, 2020.
Claims priority of application No. 2019-131728 (JP), filed on Jul. 17, 2019.
Prior Publication US 2022/0128747 A1, Apr. 28, 2022
Int. Cl. G02B 5/26 (2006.01); G02B 5/30 (2006.01); H01L 27/146 (2006.01)
CPC G02B 5/26 (2013.01) [G02B 5/3083 (2013.01); H01L 27/14625 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A filter comprising:
an optical filter layer; and
a patterned retardation layer that is laminated on the optical filter layer,
the optical filter layer includes a reflective layer that is formed of a cholesteric liquid crystal layer having at least two different reflection center wavelengths, and
the patterned retardation layer has a slow axis in a direction corresponding to the reflection center wavelength of the reflective layer,
wherein a helical pitch of the cholesteric liquid crystal layer continuously changes such that the reflection center wavelength continuously changes.