US 12,188,865 B2
Optical machine of smoke detector
Cheng-Nan Tsai, Hsin-Chu County (TW); Yen-Chang Chu, Hsin-Chu County (TW); Chih-Ming Sun, Hsin-Chu County (TW); Chi-Chih Shen, Hsin-Chu County (TW); and Kuo-Hsiung Li, Hsin-Chu County (TW)
Assigned to PIXART IMAGING INC., Hsin-Chu County (TW)
Filed by PIXART IMAGING INC., Hsin-Chu County (TW)
Filed on Apr. 15, 2022, as Appl. No. 17/722,132.
Claims priority of provisional application 63/237,153, filed on Aug. 26, 2021.
Prior Publication US 2023/0060584 A1, Mar. 2, 2023
Int. Cl. G01N 21/47 (2006.01); G01N 33/00 (2006.01); G08B 17/107 (2006.01); G01N 21/53 (2006.01)
CPC G01N 21/4738 (2013.01) [G01N 33/0027 (2013.01); G08B 17/107 (2013.01); G01N 21/53 (2013.01); G01N 2291/0217 (2013.01)] 12 Claims
OG exemplary drawing
 
1. An optical machine of a smoke detector, the optical machine comprising:
a substrate;
a light sensor, arranged on the substrate;
a light source, arranged on the substrate and having an emission angle;
a transparent gel, encapsulating the light sensor and the light source, and having a first tilted surface extending from a first side of the transparent gel toward the light source to be connected to an upper surface of the transparent gel above the light source, wherein a part of a top surface of the light source is opposite to the first tilted surface in a longitudinal direction and another part of the top surface of the light source is opposite to the upper surface of the transparent gel in the longitudinal direction; and
a first light blocking layer, formed on the first side and the first tilted surface of the transparent gel to block a part of the emission angle of the light source and to expose the another part of the top surface of the light source in the longitudinal direction.