Patent ID: 9746149
Date: 2017-08-29
CPC Classifications: F21S

Claim:
1. A vehicle lighting unit having a bulb fixation structure, comprising: a main body having a bulb attachment hole formed therein and an opening end face, and a holder that is integrally formed with the main body and projected around a peripheral edge of the bulb attachment hole and has an opening end face; a supporter spring that is made of a metal plate and is attached to the opening end face of the holder, the supporter spring having a plurality of claw escape holes by cutting part of the supporting spring and a plurality of engagement springs formed adjacent to the respective claw escape holes; and a bulb having a plurality of engagement claws to be allowed to pass through the claw escape holes of the supporter spring so that part of the bulb is incorporated within the holder, wherein the bulb is fixed to the main body with a type of a bayonet scheme in which the passed bulb is rotated around an axial center thereof, so that the engagement claws of the bulb are interposed in between and held by the engagement springs of the supporter spring and the opening end face of the bulb attachment hole, the supporter spring is attached to the opening end face of the holder by countersunk screws at at least three locations in a circumferential direction of the supporter spring, the supporter spring is formed with tapered cylindrical screw holes at locations corresponding to the at least three locations for the countersunk screws so that the countersunk screws are inserted thereinto a projection for preventing wrong assembling is formed at one circumferential end of each of the claw escape holes of the supporter spring the engagement springs are formed on a side of the holder and the projections are formed on a side opposite to the side of the holder with respect to the supporter spring, the projection and the engagement spring are continuously and integrally formed to be smoothly transitioned to each other, and the claw escape hole, the projection, the engagement spring, and the screw hole are arranged in this order in the circumferential direction of the supporter spring.