Abstract: A method for driving a lamp (2) comprises the steps of: generating a lamp current (ICONST) having a constant magnitude; defining a commutation period having a duration TCOMM; defining a time base of original commutation moments, having fixed mutual intervals of 0.5*TCOMM; receiving data to be embedded in the light output; commutating the lamp current at commutation moments; wherein individual commutations are time-modulated in order to encode said received data. Preferably, a commutation moment is: either equal to an original commutation moment if there are no data to embed; or advanced over a modulation distance (?) with respect to the corresponding original commutation moment in order to encode data having a first value (“0”); or delayed over said modulation distance (?) with respect to the corresponding original commutation moment in order to encode data having a second value (“1”).

Abstract: A method for recording an image on a thermographic material (m) provides a thermographic material, a transparent thermal head (TH) having energizable heating elements (Hi), and a radiation beam (L). The heating elements of the thermal head are activated and the radiation beam is passed through transparent parts of the thermal head. Herein, the total energy resulting from the thermal head and from the radiation beam has a level corresponding to a gradation of the image to be recorded. Further embodiments comprise e.g. holding the thermographic material on one and a same drum during both an imagewise exposing step and a heating step.

Abstract: A plurality of finger articulation units that individually mount on finger and thumb nails and together, by selected up and down movement of the fingers and thumbs (ten fingers), serve as an alternate to a keyboard and/or for any human to machine and/or computer interface. Vertical up and down movements of any single one of the ten fingers and various combinations of the fingers is translated into a range of signals recognizable as alpha-numeric numbers, digital signalling, word and picture forms or other symbol forms a user may choose. The individual finger articulation devices are each attached to the ten fingernails by clips securing a unit to each of the ten fingernails whereby movement of a particular finger, up and down is detected. The device on that finger generates a signal passed via interface control to a computer for interpretation by a program to produce a symbol.