Preh Gmbh

Preh, Elektrofeinmechanische Werke

Anton Rüttiger

Jürgen Nauth

Markus Peschel

Thomas Ofenhitzer

An indicating instrument including at least one display unit including display segments that are used to represent a currently engaged gear and a background surrounding the display segments, and a control circuit configured to apply a first signal having a first polarity to the display segments and a second signal having a second polarity opposite to the first polarity to the background such that the display segments and the background have different contrasts to indicate the currently engaged gear.

Indicating instrument with a gear indicator

A measuring device for detecting a humidity and temperature of a window surface including at least one moisture sensor and at least one temperature sensor placed on the window surface, an evaluation unit connected downstream from the moisture and temperature sensors, and a signal converting and linking unit placed between the moisture and temperature sensors and the evaluation unit. Further, when the temperature sensor detects a change in a temperature of the window surface or the moisture sensor detects a change in a moisture of the window surface, a frequency of an oscillator included in the signal and converting unit is changed.

Condensation sensor

A rotary switch including a control element, a light-emitting device arranged on a printed circuit board and configured to emit light, and at least two receivers arranged on the printed circuit board in correspondence with the light-emitting device and configured to detect switching positions of the rotary switch. Further, the light-emitting device is mounted radially at an outside portion of inside of a hollow cylindrical extension of the control element, and wherein on level with the light-emitting device, the extension includes orifices evenly distributed around a periphery of the extension, and that opposite the light-emitting device, on an exterior side of the extension, the at least two receivers are arranged.

Integrated optical encoder

A measuring device for detecting a humidity and temperature of a surface of a glass pane facing an interior of a vehicle. The measuring device includes at least one humidity sensor and at least one temperature sensor jointly arranged on the surface of the glass pane, an evaluation unit connected downstream of the humidity and temperature sensors, and a signal conversion and linking unit arranged between the humidity and temperature sensors and the evaluation unit. Further, the converting and linking unit generates a rectangular wave-shaped signal having at least two different impulse lengths, each impulse length being a measure of a detected humidity and temperature.

An indicating instrument including a light guiding system having at least a first and second light guides, a sensor disposed at a first end of the first light guide and configured to receive incident ambient light that has traveled through the first light guide, a light-emitting device disposed at a first end of the second light guide and configured to emit light through the second light guide, and a covering body disposed at a second end of the first and second light guides that is opposite to the first ends. Further, the incident ambient light is incident upon the covering body and travels through the first light guide and is received by the sensor, and the light emitted by the light-emitting unit travels through the second light guide and exits the covering body.

Display device with combined light guide

A remote control set is provided for two like or similar devices, each of which is adjustable by remote control independently of the other, for example beds in a room. Normally, each operator controls the functions of his/her device by means of his/her remote control transmitter, and only if necessary will he/she control the functions of the device of the partner. Erroneous operation of the partner's device is thus prevented to the greatest possible extent. For this purpose, a pushbutton switch is provided in each of the two remote control transmitters. When and as long as the pushbutton switch of the one transmitter is actuated, it controls the functions of the receiver of the partner.

Growing community of inventors

Wildflecken, Germany

Anton Rüttiger