Abstract: To improve a response rate and an impact detection precision of an auxiliary acceleration sensor device for an air bag system, an auxiliary acceleration sensor device includes a longitudinal G sensor for sensing a longitudinal acceleration G of a vehicle, and lateral G sensor for sensing a lateral acceleration G of the vehicle. The longitudinal G sensor includes a constant current source circuit, a detector portion for outputting an electrical signal representative of a longitudinal acceleration G, and an amplifier portion for amplifying the signal received from the detecting portion. The comparator includes comparing elements that compare the voltage values corresponding to longitudinal threshold values Tf1 to Tf4 of the longitudinal acceleration G with an output signal of the amplifier portion.

Abstract: The invention provides a semiconductor acceleration sensor which is small in size, light in weight, simple in manufacture, low in manufacturing cost, and high in accuracy, and which, with a switch-on time set to a predetermined value, is stable in operation. In a semiconductor acceleration sensor in which a central board 1 having a central contact section 11, and outside boards 2 at least one of which has an outside contact section 21 are stacked; the central board 1 has a weight 12 near the central contact section 11, and the outside board 2 having the outside contact section 21 has a weight confronting section 11 which confronts with the weight 12, for squeezed damping effect.

Abstract: A semiconductor acceleration sensor including a central board having a movable electrode section, an outside board having a stationary electrode section, and a sealing insulating section for joining the central board and the outside board which are laminated on each other, wherein the sealing insulating section has a conductive layer, and the conductive layer is a sealing member or an anodic bonding electrode.

Abstract: An acceleration sensor includes a first substrate, a second substrate and a third substrate. The second substrate has a through-hole, a first contact formed on an inner surface of the through-hole, and a first bonding pad connected to the first contact. An electrically conductive ball is accommodated in the through-hole. The third substrate has a recess, a second contact formed in the recess contacting the bottom of the electrically conductive ball, and a second bonding pad connected to the second contact.

Abstract: A semiconductor acceleration sensor comprising a rectangular semiconductor substrate on the moving electrode side and a rectangular semiconductor substrate on the fixed electrode side laminated on each other, the moving electrode side substrate being formed with a heavy weight and a thin cantilever, a moving electrode being provided on the heavy weight, a first electrostatic attraction electrode being provided on the cantilever, the fixed electrode side substrate being formed with a fixed electrode at a position opposed to the moving electrode and a second electrostatic attraction electrode at a position opposed to the electrostatic attraction electrode. The first and second electrostatic attraction electrodes are placed facing each other. A predetermined spacing is provided between the electrostatic attraction electrodes and a predetermined voltage is applied therebetween.

Abstract: In a semiconductor acceleration sensor, a weight and thin beam parts adjacent to the weight are formed on a substrate, a moving electrode is formed on the weight, and a fixed electrode is formed at a position of the other substrate opposed to the moving electrode. Both the electrodes come in contact with each other and conduct as a result of acceleration on the weight, whereby the semiconductor acceleration sensor operates. The fixed electrode or the moving electrode is formed with a projection toward the opposed electrode and the projection and the electrode come in contact with each other and conduct by action of acceleration with a predetermined spacing held between both the electrodes for preventing occurrence of chattering caused by the electrostatic attraction force between both the electrodes.

Abstract: A small-sized, reliable, low-cost acceleration sensor includes a working mechanism having a large joint surface. In this respect, an acceleration sensor 1 is arranged so that a diaphragm portion 2D is formed on a (100) face of a plate of single crystal silicon. The four corner portions of the joint surface 2A of a square frame are expanded in the center direction of the plate of single crystal silicon so as to form expanded portions 2B. Moreover, the (100) face of the square plate of single crystal silicon is covered with a mask having at least an octagonal opening 10E before being subjected to anisotropic etching, so that the expanded portions 2B directed to the center portion are formed in the respective four corner portions of the plate of single crystal silicon.

Abstract: An acceleration sensor is based on a semiconductor technique which is suitable for mass production. The resulting acceleration sensor is small in size and high in precision. The acceleration sensor includes a stationary section, an acting section to which a force is applied in response to acceleration, a flexible section through which the stationary section is coupled to the acting section, a plurality of distortion sensing elements coupled to the flexible section, a first weight having a bottomed hole which is gradually smaller in width towards the bottom of the hole, the first weight being coupled to the acting section and a second weight, greater in specific gravity than the first weight, coupled to the bottom of the hole of the first weight.

Abstract: A brake control system for a vehicle in which a brake pressure is generated in accordance with a signal from an electronic control unit for applying the brake pressure to vehicle wheels, characterized in that a mechanical brake system is automatically actuated when an unexpected electrical fault has occurred in an electrical brake system.

Abstract: A machine tool employs a cam, driven in response to an angular position signal of a workpiece, to cyclically displace a cutting tool with respect to the workpiece.

Abstract: A light-weight, highly rigid tool slide for a machine tool is provided which may be machined with a high degree of precision, whereby lateral play or "wobble" of the tool is reduced. The tool slide comprises an elongated slide member slidingly carried in a substantially cylindrical channel formed in the surface of a base member. A cover member covers both the channel and the slide member, which has a flat surface machined therein so as to conform to the shape of the covered channel. The channel in the base member may include an enlarged middle portion to reduce surface contact with the slide member and to provide space for lubricating material. A through-bore may be formed in the slide member to reduce its weight. An encoder monitors the rotational angle of a workpiece and drives a numerical controller and servomotor to move a cutting tool inward and outward in synchronism with the rotation of the workpiece.