Patent ID: 8368523

Claim:
A collision detection sensor for detecting a collision of a vehicle bumper with an object, the collision detection sensor comprising: an absorber configured to be deformed with the collision to absorb impact force of the collision, the absorber being located in the bumper and located in front of a bumper reinforcement in a vehicle front-rear direction; a chamber member defining a chamber room therein, the chamber member being located in the bumper and located in front of the bumper reinforcement in the vehicle front-rear direction; a pressure sensor configured to detect pressure in the chamber room; and a collision detection circuit for detecting the collision based on the detected pressure, wherein a front end of the absorber is located further away from the bumper reinforcement than a front end of the chamber member in the vehicle front-rear direction; wherein the chamber member is located outside the absorber, the chamber member does not overlap the absorber in the vehicle front-rear direction, and the absorber and the chamber member are separate components; and wherein a rear end of the absorber, opposite the front end of the absorber in the vehicle front-rear direction, is fixed to a front surface of the bumper reinforcement, and a rear end of the chamber member, opposite the front end of the chamber member in the vehicle front-rear direction, is fixed to the front surface of the bumper reinforcement; the rear end of the absorber and the rear end of the chamber member are fixed to the same front surface of the same bumper reinforcement.