US 12,422,598 B2
ATR prism and method of manufacturing ATR prism
Mitsuru Tomita, Shiga (JP)
Assigned to NIPPON ELECTRIC GLASS CO., LTD., Shiga (JP)
Filed by Nippon Electric Glass Co., Ltd., Shiga (JP)
Filed on Aug. 31, 2022, as Appl. No. 17/900,234.
Claims priority of application No. 2021-148793 (JP), filed on Sep. 13, 2021.
Prior Publication US 2023/0079647 A1, Mar. 16, 2023
Int. Cl. G02B 5/04 (2006.01); G01N 21/552 (2014.01)
CPC G02B 5/04 (2013.01) [G01N 21/552 (2013.01)] 12 Claims
OG exemplary drawing
 
8. An attenuated total reflection (ATR) prism comprising:
glass having an internal transmittance of 90% or higher at a wavelength falling within a wavelength range of from 8 μm to 10 μm when the glass has a thickness of 2 mm;
an incident portion on which light having a wavelength falling within the wavelength range is incident;
a reflecting portion configured to reflect the light;
an exit portion configured to allow the light to exit; and
a lens portion formed integrally with the exit portion,
wherein the exit portion is formed integrally with the reflecting portion,
wherein the reflecting portion comprises a reflecting surface configured to reflect the light,
wherein the lens portion is formed on the reflecting surface, and
wherein the lens portion is formed on a recessed portion formed in the reflecting surface so as to prevent the lens portion from projecting beyond the reflecting surface.