Abstract: A printed circuit board having a plurality of bumps that serve for connection terminals, the bumps being formed by covering the printed circuit except portions where the bumps are to be formed, applying an electroplating onto the uncovered bump-forming portions on the printed circuit maintaining a thickness nearly equal to that of the covering, applying thereon a non-electrolytic plating and electroplating on the whole surface from the surfaces of the bump-forming portions to the surfaces of the covered portions, and removing the platings by etching from the surface except the bump portions.

Abstract: A suspension pressure control system on a vehicle applies a pressure which is proportional to a current level supplied to a solenoid of a pressure control valve to a shock absorber associated with respective one of suspensions from the valve. An electronic controller controls the current level to maintain an attitude of a vehicle substantially constant in spite of any change of longitudinal and lateral acceleration, which are detected by acceleration sensors. If a driver on the vehicle closes test indication switches TSW1 and TSW2, indicates "high" by a height indication switch HSW and rotates a steering wheel on the vehicle by B toward right, the vehicle laterally inclines such that a height of the left side of the vehicle rises up and a right side falls down responding to the rotation of the steering wheel. The inclination increases as the rotation of the steering wheel increases. The inclination decreases when the steering wheel rotates inverse direction toward the neutral position.

Abstract: In a fluid pressure type active suspension in a vehicle such as an automobile, having a fluid pressure type actuator supporting a vehicle body from a wheel so as to be able to vary a height of the vehicle body relative to the wheel in accordance with a fluid pressure supplied to its fluid chamber, a fluid supply passage for supplying a working fluid to the fluid chamber of the actuator, a fluid exhaust passage for exhausting the working fluid from the fluid chamber of the actuator, and a pressure control circuit including a switching-over valve traversing the fluid supply passage and the fluid exhaust passage so as to be operated by a pilot pressure to selectively connect the fluid chamber of the actuator with either the fluid supply passage or the fluid exhaust passage for controlling the fluid pressure supplied to the fluid chamber of the actuator, a variable throttle valve for generating the pilot pressure for operating the switching-over valve from the pressure of the working fluid in the fluid supply pas

Abstract: A rotation angle detecting device, that outputs a position data and a control data, each having a prescribed number of bits, as a serial data. A position-data generating circuit, that includes first detecting circuits, that are turned on or off according to the angle of rotation of a rotary shaft, outputs a position data, having a prescribed number of bits, according to the angle of rotation. A state-data generating circuit, that includes second detecting circuits, that are turned on or off according to the signals from the first detecting circuits, outputs a state data, having a prescribed number of bits, that indicate the states of operation of the first detecting circuits. The state data is transformed to a control data after passing through a data selector and a control code generating circuit. The last bit of the serial data is a parity bit.