Sensor
AssigneeFUJIFILM Corporation
InventorsHiroshi SATO, Katsumi SASATA, Yukito SAITOH
Life of this patent
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Abstract
Provided is a sensor having a high SN ratio. The sensor includes a light source, a band pass filter, and a light-receiving element, in which the band pass filter includes two cholesteric liquid crystal layers and a discontinuous layer disposed between the two cholesteric liquid crystal layers, in the two cholesteric liquid crystal layers, helical twisted directions and helical pitches are the same, and in a case where the discontinuous layer is a layer other than a cholesteric liquid crystal layer and a wavelength having a lowest reflectivity in a selective reflection wavelength range of the band pass filter is represented by λm [nm], a thickness [nm] is in a range of “30×(λm/550) to 150×(λm/550)”.
Claims20
A sensor comprising:
- a light source;
- a band pass filter;
- and
- a light-receiving element,
- wherein the band pass filter includes a first cholesteric liquid crystal layer and a second cholesteric liquid crystal layer that are layers obtained by immobilizing a cholesteric liquid crystalline phase and a discontinuous layer that is disposed between the first cholesteric liquid crystal layer and the second cholesteric liquid crystal layer,
- in the first cholesteric liquid crystal layer and the second cholesteric liquid crystal layer, helical twisted directions and helical pitches of the cholesteric liquid crystalline phases are the same, and
- in a case where the discontinuous layer is a layer other than a cholesteric liquid crystal layer and a wavelength having a lowest reflectivity in a selective reflection wavelength range of the band pass filter is represented by λm [nm], a thickness [nm] is in a range of
- 30×(λm/550) to 150×(2 m/550).
A sensor comprising:
- a light source;
- a band pass filter;
- and
- a light-receiving element,
- wherein the band pass filter includes a first cholesteric liquid crystal layer and a second cholesteric liquid crystal layer that are layers obtained by immobilizing a cholesteric liquid crystalline phase,
- in the first cholesteric liquid crystal layer and the second cholesteric liquid crystal layer, helical twisted directions and helical pitches of the cholesteric liquid crystalline phases are the same,
- the first cholesteric liquid crystal layer and the second cholesteric liquid crystal layer are in direct contact with each other, and
- an angle between optical axes derived from a liquid crystal compound on contact surfaces of the first cholesteric liquid crystal layer and the second cholesteric liquid crystal layer is 45° to 90°.
Dependencies are inferred from the claim text.