US 12,405,255 B2
Detector for liquid chromatograph
Yusuke Nagai, Kyoto (JP)
Assigned to SHIMADZU CORPORATION, Kyoto (JP)
Appl. No. 17/630,125
Filed by SHIMADZU CORPORATION, Kyoto (JP)
PCT Filed Aug. 5, 2019, PCT No. PCT/JP2019/030761
§ 371(c)(1), (2) Date Jan. 25, 2022,
PCT Pub. No. WO2021/024360, PCT Pub. Date Feb. 11, 2021.
Prior Publication US 2022/0260535 A1, Aug. 18, 2022
Int. Cl. G01N 30/74 (2006.01); G01N 30/02 (2006.01)
CPC G01N 30/74 (2013.01) [G01N 2030/027 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A detector for liquid chromatograph comprising:
a light source;
a flow cell that includes:
a casing,
a linear capillary that delimits a flow path for allowing a sample liquid to flow through,
a holding member that holds one end portion of the capillary relative to the casing,
an entrance port in the casing for allowing light to enter one end of the capillary, and
an emission port in he casing for allowing light to be emitted from another end of the capillary;
a condensing mirror for guiding light from the light source to the entrance port of the flow cell; and
a light receiver for detecting the light emitted from the emission port of the flow cell,
a lens provided at the entrance port of the flow cell, such that the guided light is incident on the lens, wherein the lens includes:
a convex surface;
a planar surface opposite the convex surface; and
a side surface perpendicular to the planar surface;
wherein the lens is held relative to the casing via the side surface of the lens, such that the planar surface of the lens seals the entrance portion of the casing;
wherein the light incident on the lens is non-parallelized and is received by the convex surface of the lens;
wherein the lens is arranged so as to parallelize light in a center region around an optical axis among light directed to the one end of the capillary from the condensing mirror and distance a first reflection position of the light in the center region farther from the one end than a portion held by the holding member, such that an amount of light incident on an interface between an outer peripheral surface of the capillary and the holding member is reduced, and total reflection efficiency within the capillary is improved; and
wherein the lens parallelizes the non-parallelized light by reducing an inclination angle to the optical axis.