US 11,953,648 B1
Light curtain
Hirokazu Niimura, Osaka (JP)
Assigned to KEYENCE CORPORATION, Osaka (JP)
Filed by Keyence Corporation, Osaka (JP)
Filed on Aug. 4, 2023, as Appl. No. 18/230,248.
Claims priority of application No. 2022-147677 (JP), filed on Sep. 16, 2022; and application No. 2023-032502 (JP), filed on Mar. 3, 2023.
Int. Cl. G01V 8/20 (2006.01)
CPC G01V 8/20 (2013.01) 18 Claims
OG exemplary drawing
 
1. Alight curtain comprising:
a housing in which one element of a pair of a light projecting element and a light receiving element forming a plurality of optical axes is disposed inside along a longitudinal direction in order to form the plurality of optical axes at intervals, the housing including a metal case extending in the longitudinal direction and end members connected to both ends of the metal case;
a cover that transmits light from the light projecting element and is attached to the housing so as to cross the plurality of optical axes;
an indicator lamp that is a light diffusing member disposed outside an outer surface of at least one of the cover and the housing along the longitudinal direction or formed in series with the cover; and
an indicator lamp light source that is accommodated in the housing and supplies light for displaying toward the indicator lamp.