Takata Corporation

Kazuo Yoshimura

Shigeru Shimozono

Ryo Satoh

Ryo Sato

Koichi Furukawa

Satoh Ryo

An acceleration sensor is formed of a housing, an inertia member located inside the housing so as to be freely movable in a longitudinal direction of the housing, a conductor provided on at least an end surface of the inertia member in the longitudinal direction of the housing, a pair of electrodes disposed at one end side of the longitudinal direction of the housing, and electrically connected together by a conductive bridging inertia member. An attractor is disposed at the other end side of the longitudinal direction of the housing and magnetically attracts the inertia member. A stopper is disposed at an opposite side of the inertia member with respect to the electrodes, and abuts against the tip surface of the inertia member when the inertia member moves forwardly. The stopper is disposed at a position which is located off-center with respect to or deviated from the axial center line of the housing.

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 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. At least a part of the electrodes described is made of a magnetic material which attracts magnetically the inertial member to prevent chattering between the inertial member and the electrodes.

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 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 one end surface of the inertial member that faces a first longitudinal end of the cylinder, a pair of electrodes disposed at the first longitudinal end of the cylinder, and an atracting 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 sensor further comprises a coil for testing the operation of the sensor and an another coil capable of biasing magnetically the inertial member to compensate operation of the cylinder due to temperature.

An accelerator sensor comprises 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 one 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 has a thick wall portion at the end of the cylinder where the electrodes are located. Chattering of the electrodes is prevented by a strong magnetic force of the thick wall portion which reduces the impact speed of the inertial member prior to engagement of the conductive member and the electrodes.

Disclosed is an acceleration sensor comprising: a rotary member rotatable about a rotary shaft having its gravity center positioned outwardly of the rotary shaft and a conductive member constituting at least a part of the portion other than the rotary shaft; a magnet provided opposite to the conductive member during a rotation of the rotary member; and a rotation detecting device for detecting a predetermined rotational angle of the rotary member. The locations of the magnet and the conductive member may be reversed.

Acceleration sensor with magnetically influenced rotary member

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

Kazuo Yoshimura