US 12,085,449 B2
Color measurement apparatus
Kenichi Furuya, Shiojiri (JP); Haruki Miyasaka, Matsumoto (JP); and Hisayuki Akahane, Matsumoto (JP)
Assigned to SEIKO EPSON CORPORATION, Tokyo (JP)
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on Nov. 12, 2021, as Appl. No. 17/524,890.
Claims priority of application No. 2020-188466 (JP), filed on Nov. 12, 2020.
Prior Publication US 2022/0146318 A1, May 12, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. G01J 3/02 (2006.01); G01D 5/14 (2006.01); G01J 3/50 (2006.01); G01J 3/51 (2006.01)
CPC G01J 3/51 (2013.01) [G01D 5/14 (2013.01); G01J 3/0232 (2013.01); G01J 3/50 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A color measurement apparatus, comprising:
an opening portion forming member in which an opening portion for causing light arriving from a measurement target to enter inside the color measurement apparatus is formed, wherein the opening portion forming member is arranged on a bottom surface at a time of measurement performed by the color measurement apparatus;
an incident light processing portion configured to process light incident through the opening portion, wherein the incident light processing portion comprises a photo diode;
a shutter unit that includes a shutter, wherein
the shutter unit is configured to be displaced between a closed position at which the opening portion is covered, and an open position at which the opening portion is open, and
the shutter unit includes a magnet and a reflection reference surface used as a reference of reflectance at a position facing the opening portion; and
a detection section that includes a sensor, wherein
the detection section detects a position of the shutter unit,
the detection section detects changes in a detection signal to be output in accordance with displacement of the shutter unit,
the detection section comprises a magnetic sensor, and
in the open position of the shutter unit, the magnet is at a position that overlaps the magnetic sensor in an optical axis direction of the color measurement apparatus.