Jaguar Cars Limited

Perkins Limited

W.a. Technology Limited

Colin John Wilson

Carl Pickering

Peter Robert Thomas

Richard Dean Parkinson

Ian Richard Thorp

David Roy Withers

Ewan Stuart Bewley

A touch screen control system comprising a touch screen having first and second conductive layers arranged to be brought together by touching of the screen. A detection system is arranged to detect a contact position at which the screen is touched by monitoring electrical signals from at least one of the layers. The system further comprises an antenna, and the detection system includes a proximity sensing signal generator arranged to generate a proximity sensing signal to be transmitted between the antenna and the first layer via a user of the system. The detection system is further arranged to receive the transmitted proximity sensing signal and determine therefrom the distance between a part of the user and the touch screen.

Touch screens

A touch screen control system comprising a touch screen () having first () and second conductive layers () arranged to be brought together by touching of the screen (). A detection system () is arranged to detect a contact position at which the screen () is touched by monitoring electrical signals from at least one of the layers (). The system further comprises an antenna (), and the detection system includes a proximity sensing signal generator arranged to generate a proximity sensing signal to be transmitted between the antenna () and the first layer () via a user () of the system. The detection system is further arranged to receive the transmitted proximity sensing signal and determine therefrom the distance between a part () of the user and the touch screen ().

A method of operating a two-coil solenoid valve of the type including an armature member located in a housing for movement between a first electromagnet and a second electromagnet, each electromagnet being located adjacent to a respective end of the armature member and being switchable between an on state and an off state. In order to move the armature member from a first position closely adjacent to the first electromagnet to a second position closely adjacent to the second electromagnet, the electromagnets are controlled to be at the same initial switched state and subsequently one of the electromagnets is switched to the other switched state for a first predetermined period sufficient to allow the resultant pull exerted on the armature member to be such that the armature member is caused to move towards the second electromagnet. The duration of the first predetermined period is such that the one electromagnet is switched back to its initial switched state before the armature member reaches the second position.

Method of operating a two-coil solenoid valve

A current amplifier including two stages. A first stage is formed by a primary operational amplifier (IC1) connected in a virtual earth feedback configuration and having a feedback loop formed by a resistor (R1) and capacitor (C1) connected in parallel so that the primary operational amplifier has a frequency response up to a predetermined frequency and thereafter the frequency response rolls off at a predetermined rate. A second stage including another operational amplifier (IC2) connected in a virtual earth or non-inverting feedback configuration having a frequency characteristic chosen to provide in combination with the frequency characteristic of the primary amplifier a desired operating range for the amplifier. The predetermined frequency lies between the frequency extremes of the operating range and the frequency characteristic of the second stage has a constant gain up to said predetermined frequency and a gain matched with and complementary to the roll-off of the primary operational amplifier (IC1) above the predetermined frequency so that the overall frequency response of the current amplifier is flat over its operating range.

Growing community of inventors

Hertfordshire, United Kingdom

Colin John Wilson