US 12,107,385 B2
Light emitting device, optical device, and measurement device
Daisuke Iguchi, Kanagawa (JP); and Kazuhiro Sakai, Kanagawa (JP)
Assigned to FUJIFILM Business Innovation Corp., Tokyo (JP)
Filed by FUJIFILM Business Innovation Corp., Tokyo (JP)
Filed on Dec. 4, 2020, as Appl. No. 17/111,516.
Claims priority of application No. 2020-030345 (JP), filed on Feb. 26, 2020.
Prior Publication US 2021/0265807 A1, Aug. 26, 2021
Int. Cl. H01S 5/0233 (2021.01); G01B 11/24 (2006.01); G06V 40/16 (2022.01); H01S 5/183 (2006.01); H01S 5/343 (2006.01); H01S 5/42 (2006.01)
CPC H01S 5/0233 (2021.01) [G01B 11/24 (2013.01); H01S 5/423 (2013.01); G06V 40/166 (2022.01); H01S 5/18313 (2013.01); H01S 5/18361 (2013.01); H01S 5/3432 (2013.01); H01S 5/34353 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A light emitting device comprising:
a wiring board having a first wiring layer and a second wiring layer adjacent to the first wiring layer via an insulating layer;
a laser having a cathode electrode and an anode electrode, mounted on the wiring board, and driven through low-side driving; and
a capacitive element mounted on the wiring board and configured to supply a drive current to the laser,
wherein the first wiring layer comprises:
a cathode wire connected to the cathode electrode; and
an anode wire connected to the anode electrode,
wherein the second wiring layer comprises a reference potential wire connected to a reference potential,
wherein the reference potential wire overlaps the anode wire, and
wherein the anode wire surrounds the capacitive element,
wherein an area of the anode wire is 50% or more as large as an area of the wiring board.