| 摘要 |
PROBLEM TO BE SOLVED: To further reduce variation of a position of a light-emitting body due to mounting of a heat transmission body in comparison to that in a configuration in which the heat transmission body is mounted while pressing an exposure device in one direction along an optical axis of the light-emitting body.SOLUTION: An LPH 14 of the present invention includes: a light-emitting chip; a heating element 49 that generates heat according to light-emitting operation of a circuit board 42 and the light-emitting chip; a holder 45 for holding the circuit board 42; and a transmission member 50 that is mounted while sandwiching the holder 45 and to which the heat generated in the heating element 49 is transmitted by being in contact with the heating element 49. The transmission member 50 is mounted to a position in which the circuit board 42 exists on a straight line connecting pressing positions for pressing side surfaces of the holder 45. |
