Siemens Aktiengesellschaft

Mannesmann Vdo Ag

Christopher Sievers

Reinhold Berberich

Gregor Hassler

Thorsten B&uuml;rger

An invention relates to an apparatus for shielding an electronic circuit situated on a printed circuit board in an electrically conductive housing which has at least one opening and/or bushing, in which a shielding tube extends from the printed circuit board as far as the housing and encompasses the opening and/or the bushing, and a device for length equalization of the shielding tube forms an electrical contact of the shielding tube independently of tolerances between the printed circuited board and the housing.

Apparatus for shielding

In an apparatus and a method for enabling and/or activating/deactivating a security device, in particular an access device for a motor vehicle, in which, after receiving a stimulation sequence which is transmitted by a transmitter of a transmission device, coded information (enable signal) is transmitted by a portable transmission unit (radio key) and is received by a receiver in the transmission device, a controller comparing the received enable signal with predetermined coded information and, if they match, emitting an actuation signal to the security device, if a plurality of matching radio keys are present in the reception area of the device, the transmission quality between the security device and the radio keys is checked. The only radio key which is used to transmit an enable signal is that which has the best transmission conditions to the security device.

Growing community of inventors

Hanau, Germany

Christopher Sievers