The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 07, 2021
Filed:
Sep. 28, 2018
Applicant:
Apple Inc., Cupertino, CA (US);
Inventor:
Saroj K. Sahu, Fremont, CA (US);
Assignee:
Apple Inc., Cupertino, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01N 15/14 (2006.01); H04M 1/21 (2006.01); G01N 15/06 (2006.01); G01N 15/00 (2006.01);
U.S. Cl.
CPC ...
G01N 15/1434 (2013.01); G01N 15/06 (2013.01); H04M 1/21 (2013.01); G01N 2015/0046 (2013.01); G01N 2015/0693 (2013.01); H04M 2250/12 (2013.01);
Abstract
A particulate matter sensing device includes a light source to generate a pulsed light at a first wavelength in response to a drive pulse. The device further includes one or more photodetectors. A thin-film filter is formed over the photodetectors and is tuned to be transparent to scattered light having a second wavelength substantially equal to the first wavelength. The scattered light is produced as a result of scattering of the pulsed light by the particulate matter. A charge collection circuit of the plurality of photodetectors electronically rejects background light.