US 11,942,462 B2
Optical navigation module capable of performing lateral detection
Sai-Mun Lee, Penang (MY); and Lye-Pin Chu, Penang (MY)
Assigned to PIXART IMAGING INC., Hsin-Chu County (TW)
Filed by PixArt Imaging Inc., Hsin-Chu County (TW)
Filed on Jun. 10, 2021, as Appl. No. 17/344,144.
Application 17/344,144 is a continuation of application No. 16/199,341, filed on Nov. 26, 2018, granted, now 11,063,028.
Application 16/199,341 is a continuation of application No. 14/712,012, filed on May 14, 2015, granted, now 10,192,856.
Claims priority of provisional application 62/097,725, filed on Dec. 30, 2014.
Prior Publication US 2021/0305224 A1, Sep. 30, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. H01L 25/16 (2023.01); G06F 3/042 (2006.01); H01L 27/146 (2006.01); G06F 3/0354 (2013.01)
CPC H01L 25/167 (2013.01) [G06F 3/042 (2013.01); G06F 3/0354 (2013.01); H01L 27/14618 (2013.01)] 19 Claims
OG exemplary drawing
 
1. An optical navigation module, comprising:
an optical package having a package surface, and comprising
an image sensor arranged on the package surface;
a light emitting chip arranged on the package surface and configured to emit illumination light upward; and
a reflective structure covering on the optical package and comprising:
a detection plane perpendicular to the package surface of the optical package;
one detection opening at the detection plane;
a first reflective portion having a first end configured to reflect incident light directly coming from the one detection opening downward to impinge directly on the image sensor, and further having a second end extending toward the one detection opening from the first end of the first reflective portion, wherein the incident light directly coming from the one detection opening is reflected once at the first end of the first reflective portion and then directly impinged on the image sensor;
a second reflective portion having a first end configured to reflect the illumination light directly from the light emitting chip to directly go out the reflective structure via the same one detection opening, and further having a second end extending toward the same one detection opening from the first end of the second reflective portion, wherein the illumination light directly from the light emitting chip is reflected once at the first end of the second reflective portion and then directly goes out the reflective structure; and
a wall extending toward the same one detection opening between the first reflective portion and the second reflective portion, wherein a front end of the wall is closer to the same one detection opening than the second ends of the first and second reflective portions but not reaching the same one detection opening.