Siemens Aktiengesellschaft

Josef Kraiczyk

Johannes Kroitzsch

Stephanus Mulders

A handheld transmitter has a housing in which there are disposed a printed circuit board and a battery. The circuit board and the battery are electrically connected by a contact spring. The contact spring has two preshaped spring arms each on its two ends, which are elastically braced against the printed circuit board and against the battery. The contact spring ensures that the battery and the printed circuit board are at all times securely connected electrically without being subject to disconnection caused by shaking the handheld transmitter.

Contact spring having an improved electrical contact

A chip card has flexible housing parts which are secured on one another. When the housing parts are secured to one another, support elements of the housing parts form voids, in which a flexible printed circuit board is disposed along with its components. In order to ensure that the components will not be mechanically stressed, one lubricant film is disposed between each of the housing parts and the printed circuit board and the components. The printed circuit board or components slide on the film when the card is bent.

Chip card

An antenna is constructed as an 'on-board antenna' in the form of conductor tracks on a circuit board. A conductor track on the upper surface of the circuit board is electrically connected to a conductor track on the lower surface thereof through plated-through holes. This increases both the effective antenna surface area and thus the radiation power.

Growing community of inventors

Wuppertal, Germany

Josef Kraiczyk