Takata Corporation

Ryo Satoh

Shigeru Shimozono

Kazuo Yoshimura

The acceleration sensor is formed of a cylinder; an inertial member slidably mounted in the cylinder so as to be movable in the longitudinal direction of the cylinder; a conductive member fixed at least on an end surface of the inertial member facing one longitudinal end of the cylinder; a pair of electrodes fixed relative to the cylinder at one longitudinal end of the cylinder and which, when the conductive member of the inertial member makes contact with the electrodes, are caused to conduct via the conductive member; and an attracting member fixed relative to the cylinder near the other longitudinal end of the cylinder, for magnetically attracting the inertial member. The electrodes are formed by a metal sheet whose basal ends are held by an electrode holding member and whose front ends are protruding in the travel area of the inertial member, and one of planes of the metal sheet is disposed so that it faces to the inertial member. In the acceleration sensor, the edge portions of the sheet metal forming the electrode are bent in the direction opposite to the inertial member.

Acceleration sensor

An accelerator sensor is formed of a cylinder of a conductive material, a magnetized inertial member mounted in the cylinder so as to be movable longitudinally of the cylinder, a conductive member mounted at least on the end surface of the inertial member that is located on the side of one longitudinal end of the cylinder, a pair of electrodes disposed at this one longitudinal end of the cylinder, and an attracting member disposed near the other longitudinal end of the cylinder wherein each of the electrodes has an end portion communicating to a terminal for a conductive wire and a front end which the conductive member makes contact with. Each electrode has a slit extended from the end portion to the front portion thereof. One side of the electrode divided by the slit is communicated to the terminal, and a resistor is installed between the other sides of the electrodes.

Acceleration sensor with diagnostic resistor for detecting broken

An accelerator sensor comprising a cylinder of a conductive material, a magnetized inertial member mounted in the cylinder so as to be movable longitudinally of the cylinder, a conductive member mounted at least on the end surface of the inertial member that is on the side of one longitudinal end of the cylinder, a pair of electrodes disposed at this one longitudinal end of the cylinder, and an attracting member disposed near the other longitudinal end of the cylinder. When the conductive member of the inertial member comes into contact with the electrodes, these electrodes are caused to conduct via the conductive member. The attracting member is made of a magnetic material such that the attracting member and the inertial member are magnetically attracted toward each other. The cylinder is made of a copper alloy having a resistance temperature coefficient less than 3.times.10.sup.-3.

An accelerator sensor comprising a cylinder of a conductive material, a magnetized inertial member mounted in the cylinder so as to be movable longitudinally of the cylinder, a conductive member mounted at least on the end surface of the inertial member that is on the side of one longitudinal end of the cylinder, a pair of electrodes disposed at this one longitudinal end of the cylinder, and an attracting member disposed near the other longitudinal end of the cylinder. When the conductive member of the inertial member comes into contact with the electrodes, these electrodes are caused to conduct via the conductive member. The attracting member is made of a magnetic material such that the attracting member and the inertial member are magnetically attracted toward each other. An electrical resistor is bridged between the electrodes. The electrodes and the resistor are fabricated integrally out of a synthetic resin by insert molding.

Acceleration sensor with magnetic biased mass and encapsulated contact

An acceleration sensor comprising a cylinder of a conductive material, a magnetized inertial member mounted in the cylinder so as to be movable longitudinally of the cylinder, a conductive member mounted at least on an end surface of the inertial member that is on a side of one longitudinal end of the cylinder, a pair of electrodes disposed at this one longitudinal end of the cylinder, and an attracting member disposed on a supporting device near the other longitudinal end of the cylinder. When the conductive member of the inertial member comes into contact with the electrodes, these electrodes are caused to conduct via the conductive member. The attracting member is made of a magnetic material such that the attracting member and the inertial member are magnetically attracted toward each other. The magnetized inertial member comprises a core including a cylindrical permanent magnet, a hard plating layer formed on the curved surface of the core, and a conductive plating layer formed at an end surface of the core that is located on a side of the electrodes. Another magnetized inertial member comprises a cylindrical core including a permanent magnet, a synthetic resin layer enclosing the curved surface of the core, and a conductive plating layer formed on the end surface of the core that is located on the side of the electrodes.

Disclosed is a method of manufacturing an acceleration sensor including: a cylindrical body composed of a conductive material; a magnetized inertial body so charged in an interior of the cylindrical body as to be movable in the longitudinal direction of the cylindrical body; a conductive body provided on an end surface of at least one end of the magnetized inertial body in the longitudinal direction of the cylindrical body; a pair of electrodes disposed at one end in the longitudinal direction of the cylindrical body and made conductive through the conductive body when contacting the conductive body of the magnetized inertial body; and an attracting body composed of a magnetic material, disposed at the other end in the longitudinal direction of the cylindrical body and magnetically mutually attracting the magnetized inertial body, the method comprising the steps of: assembling the acceleration sensor by incorporating the inertial body before becoming the magnetized inertial body by magnetization; and magnetizing the inertial body by thereafter applying a magnetic field to this assembled unit.

Growing community of inventors

Kanagawa, Japan

Ryo Satoh