Abstract: Air heater with PTC heating element with semiconductor switch, the semiconductor switch (5) without the housing being located in the heating tube (9) in the immediate vicinity of the PTC heating element (15).

Abstract: A heating element and a process for conducting the operating heat of a semiconductor switch to a heating cell which is triggered by the semiconductor switch via first and second heat and current conducting material strips and a frame terminal with an interposed heat-conducting insulating film. The semiconductor switch is provided with a cooling fin and is applied directly to a surface of the first heat and current conducting material strip.

Abstract: A heating element and a process for conducting the operating heat of a semiconductor switch to a heating cell which is triggered by the semiconductor switch via first and second heat and current conducting material strips and a frame terminal with an interposed heat-conducting insulating film. The semiconductor switch is provided with a cooling fin and is applied directly to a surface of the first heat and current conducting material strip.

Abstract: Air heater with PTC heating element with semiconductor switch, the semiconductor switch (5) without the housing being located in the heating tube (9) in the immediate vicinity of the PTC heating element (15).

Abstract: This invention relates to a steering angle sensor wherein the angle values are determined by the position of a code disk provided with an incremental track and a code track. So as to be able to express the 8-step-code-word-defined precision by means of six-step code words on the code track the six-step code words are supplemented by 2 bit resulting from the momentary state of the incremental track scanned by two detectors.

Abstract: This invention relates to a steering angle sensor, particularly for yawing moment control in automotive vehicles. In order to determine the required steering angle of the steered wheels the angle of rotation of the steering wheel is measured. To this end, a code disk is used which enables the reading of the position of the angle of rotation of the disk. As the steering wheel can perform a plurality of revolutions in order to pivot the steered wheels the result readable at the code disk is ambiguous. This invention suggests a counter which records the revolutions of the code disk, starting from a zero position. Further advantageous developments involve the design of the gear mechanism and the evaluation of the signals of the counter.

Abstract: The invention concerns a scanning device which scans a code disc by means of a subassembly comprising a radiation emitter and a radiation receiver. The object of the invention is to emulate the length ratio of the tooth to the tooth space by the ratio, on the output side, of pulses to interpulse periods without using complicated regulating devices. To that end, when the operating voltage for the assembly is at the maximum permissible level, the ratio of the teeth to the tooth spaces on the code carrier is to be adapted such that, on the output side, the ratio of pulses to interpulse periods is 1:1.