Title:
SPECTROSCOPIC SYSTEM
Document Type and Number:
WIPO Patent Application WO/2024/038872
Kind Code:
A1
Abstract:
Provided is a spectroscopic system that enables miniaturization. The spectroscopic system has a prism and a liquid crystal diffraction element disposed directly on the first surface of the prism or with another layer interposed therebetween, the prism has a second surface inclined with respect to the first surface, the inclination angle of the second surface is 4° or more, the liquid crystal diffraction element has a cholesteric liquid crystal layer, the cholesteric liquid crystal layer has a liquid crystal alignment pattern in which the orientation of the optical axis derived from the liquid crystal compound changes, while continuously rotating, along at least one in-plane direction, and where the length of 180° rotation of the orientation of the optical axis in the liquid crystal alignment pattern is defined as one period, the length of one period is 0.1-1.4 μm. In the spectroscopic system, the light to be analyzed is incident on the liquid crystal diffraction element side, the incident light is reflected by the liquid crystal diffraction element, the reflected light is totally reflected on the surface of the liquid crystal diffraction element opposite to the prism side, the totally reflected light is made incident on the prism, and the spectrally dispersed light is emitted from the second surface.
Inventors:
SAITOH YUKITO (JP)
YANAI YUJIRO (JP)
HISANAGA KAZUYA (JP)
YANAI YUJIRO (JP)
HISANAGA KAZUYA (JP)
Application Number:
PCT/JP2023/029591
Publication Date:
February 22, 2024
Filing Date:
August 16, 2023
Export Citation:
Assignee:
FUJIFILM CORP (JP)
International Classes:
G01J3/18; G02B5/00; G02B5/04; G02B5/18; G02B5/30
Domestic Patent References:
| WO2021132630A1 | 2021-07-01 | |||
| WO2021200228A1 | 2021-10-07 |
Foreign References:
| JP2002090549A | 2002-03-27 | |||
| JPH11194295A | 1999-07-21 | |||
| US20090034077A1 | 2009-02-05 | |||
| US4691994A | 1987-09-08 |
Attorney, Agent or Firm:
ITOH Hideaki et al. (JP)
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