US 12,068,578 B2
Light emitting module
Takuya Suzuki, Naruto (JP)
Assigned to NICHIA CORPORATION, Anan (JP)
Filed by NICHIA CORPORATION, Anan (JP)
Filed on Jan. 19, 2022, as Appl. No. 17/578,462.
Claims priority of application No. 2021-010873 (JP), filed on Jan. 27, 2021.
Prior Publication US 2022/0239065 A1, Jul. 28, 2022
Int. Cl. H01S 5/068 (2006.01); F21S 41/16 (2018.01); H01S 5/02257 (2021.01)
CPC H01S 5/06825 (2013.01) [F21S 41/16 (2018.01); H01S 5/02257 (2021.01)] 14 Claims
OG exemplary drawing
 
1. A light-emitting module comprising:
a laser element configured to emit a laser light;
a converting member configured to reduce a coherence of the laser light;
a sense wiring electrically connected to the converting member;
an electric potential determining circuit configured to output a first value when an electric potential at a first end of the sense wiring is in a predetermined range, and to output a second value when the electric potential at the first end of the sense wiring is out of the predetermined range;
a first switching element electrically connected in series to the laser element, the first switching element configured to become conductive when the output of the electric potential determining circuit is the first value, and to become non-conductive when the output of the electric potential determining circuit is the second value; and
a second switching element electrically connected in parallel to a circuit comprising the laser element and the first switching element, the second switching element configured to become conductive when the output of the electric potential determining circuit is the second value, and to become non-conductive when the output of the electric potential determining circuit is the first value.