Koninklijke Philips Corporation N.v.

Excelitas Technologies Gmbh & Co Kg

Martin Liess

Aldegonda Lucia Weijers

Juergen Schilz

A method for correcting the output signal of a radiation sensorincludes obtaining two or more temperature signals from a corresponding number of measurements of quantities at different times and/or different locations relating to the temperature of the sensor, and correcting the output signal with reference to said temperature signals.

Method and apparatus for correcting the output signal of a radiation sensor and for measuring radiation

In an apparatus for handling sheet material or an optical input device, for example, which employs a relative movement sensor () utilizing the so-called 'self-mixing' effect of a laser diode, a band pass filter () is provided for filtering the electric signal resulting from measurement of the electric signal to reduce or substantially eliminate the effects of both the low frequency carrier signal and the high frequency noise present in such a signal. As a result, the precision of the laser self-mixing translation measurements is significantly improved.

Movement sensor

An apparatus includes an optical keyboard and an optical input device controlled by a moving object. The input device has at least one diode laser and photo diode for supplying at least one measuring beam to a device window and for receiving radiation reflected by the object placed on the window. The input device may be integrated in the keyboard such that the measuring beam is guided via the positions of the keys to the window.

Apparatus equipped with an optical keyboard and optical input device

In an optical input device based on movement of an object () and the device relative to each other and which comprising at least one optical sensor unit including a laser () having a laser cavity for generating a measuring beam (), converging means () for converging the measuring beam in an action plane and for converging measuring beam radiation reflected by the object in the laser cavity to generate a self-mixing effect in the laser and measuring means for measuring the result of the self-mixing effect, which effect is determined by said movement, the converging means () is adapted to provide a self-mixing effect that is smaller than a possible maximum but larger than a detection threshold for an extended range of distances (&#x394;Z) between the object and the device. This allows obtaining the required self-mixing effect in an extended range of distances between the object and the device.

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Wiesbaden, Germany

Martin Liess