US 11,672,059 B2
Light source device and electronic device
Takashi Masuda, Kanagawa (JP); Mitsushi Tabata, Kanagawa (JP); Koichi Okamoto, Kanagawa (JP); and Yasuo Oba, Kanagawa (JP)
Assigned to SONY SEMICONDUCTOR SOLUTIONS CORPORATION, Kanagawa (JP)
Appl. No. 17/310,313
Filed by SONY SEMICONDUCTOR SOLUTIONS CORPORATION, Kanagawa (JP)
PCT Filed Jan. 16, 2020, PCT No. PCT/JP2020/001168
§ 371(c)(1), (2) Date Jul. 27, 2021,
PCT Pub. No. WO2020/162128, PCT Pub. Date Aug. 13, 2020.
Claims priority of application No. JP2019-019194 (JP), filed on Feb. 5, 2019.
Prior Publication US 2022/0104322 A1, Mar. 31, 2022
Int. Cl. H05B 45/30 (2020.01); H05B 45/325 (2020.01); H05B 47/25 (2020.01); G01S 7/484 (2006.01); G05F 1/56 (2006.01)
CPC H05B 45/325 (2020.01) [G01S 7/484 (2013.01); G05F 1/56 (2013.01); H05B 45/30 (2020.01); H05B 47/25 (2020.01)] 21 Claims
OG exemplary drawing
 
1. A light source device, comprising:
a first resistor connected to a potential;
a light emitting element connected in series to the first resistor;
a second resistor connected to the potential;
a first current source connected in series to the second resistor, wherein the first current source is configured to supply a freely-selected current;
a first connection part where the first resistor is connected to the light emitting element, wherein the first connection part is configured to output a first voltage;
a second connection part where the second resistor is connected to the first current source, wherein the second connection part is configured to output a second voltage; and
a detector configured to detect a first drive current for the light emitting element, wherein the detection of the first drive current is based on the first voltage, the second voltage, and the freely-selected current.