US 11,692,870 B2
Proximity sensor using partial-transmissive-partial-reflective optical element with a same light transmission window and manufacturing method thereof
Hui-Hsuan Chen, Hsinchu (TW); and Nien-Tse Chen, HsinChu (TW)
Assigned to PIXART IMAGING INCORPORATION, Hsinchu (TW)
Filed by PixArt Imaging Incorporation, HsinChu (TW)
Filed on Mar. 23, 2021, as Appl. No. 17/209,635.
Application 17/209,635 is a continuation of application No. 16/745,483, filed on Jan. 17, 2020, granted, now 10,982,996.
Application 16/745,483 is a continuation of application No. 15/458,941, filed on Mar. 14, 2017, granted, now 10,578,482, issued on Mar. 3, 2020.
Application 15/458,941 is a continuation in part of application No. 15/226,599, filed on Aug. 2, 2016, granted, now 10,222,457, issued on Mar. 5, 2019.
Application 15/226,599 is a continuation of application No. 14/061,709, filed on Oct. 23, 2013, granted, now 9,435,886, issued on Sep. 6, 2016.
Prior Publication US 2021/0207992 A1, Jul. 8, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. G01S 7/481 (2006.01); G01J 1/02 (2006.01); G01J 1/04 (2006.01); G02B 27/14 (2006.01); G01S 7/499 (2006.01); G01S 17/04 (2020.01)
CPC G01J 1/0204 (2013.01) [G01J 1/0233 (2013.01); G01J 1/0414 (2013.01); G01J 1/0466 (2013.01); G01J 1/0488 (2013.01); G01S 7/4811 (2013.01); G01S 7/4813 (2013.01); G01S 7/499 (2013.01); G01S 17/04 (2020.01); G02B 27/144 (2013.01); Y10T 29/49016 (2015.01)] 5 Claims
OG exemplary drawing
 
1. An optical sensing device, comprising:
a light source, configured to emit a light beam;
a sensing unit, configured to receive a reflected light beam;
a light guide unit which includes a partial-transmissive-partial-reflective (PTPR) optical element, disposed in the transmission path of the light beam and the reflected light beam; and
a window located between the PTPR optical element and the object, the light beam emitted from the light source and the reflected light beam passing through this same window;
wherein the light source and the sensing unit are located on a same substrate, and the light beam emitted by the light source is first transmitted to the PTPR optical element, and further next is transmitted to pass through the window,
wherein the reflected light passing through the window is transmitted to the PTPR optical element, and further next is transmitted to the sensing unit.