Light emitting module

A light-emitting module comprising:

• a laser element configured to emit a laser light;
• a converting member configured to reduce 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;
• and
• 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;
• wherein the electric potential determining circuit comprises
• a first comparator configured to output the first value when the electric potential at the first end of the sense wiring is lower than a first reference potential, and to output the second value when the electric potential at the first end of the sense wiring is higher than the first reference potential,
• a second comparator configured to output the first value when the electric potential at the first end of the sense wiring is lower than the first reference potential, and to output the second value when the electric potential at the first end of the sense wiring is higher than the first reference potential,
• a third comparator configured to output the first value when the electric potential at the first end of the sense wiring is higher than a second reference potential that is lower than the first reference potential, and to output the second value when the electric potential at the first end of the sense wiring is lower than the second reference potential, and
• a fourth comparator configured to output the first value when the electric potential at the first end of the sense wiring is higher than the second reference potential, and to output the second value when the electric potential at the first end of the sense wiring is lower than the second reference potential.