Robert Boschgmbh

Kudelski Sa Fabrique De'enregistreurs Nagra

Jean-Claude Schlup

Stefan Kudelski

Ernest Rosselet

Error prevention in a recording and reproducing device with at least one

To permit multi-color recording on metalized recording paper, in which an electrode burns off a metal layer covering a colored pattern, and to provide for ready association of the electrode with a specific discrete removal position and particular colors appearing thereat, the colors are applied in the form of a line pattern formed of elementary groups or sets (10, 16) of color lines, the color lines being applied in repetitive identical patterns to the carrier, without intervening gaps.

Method and system for thermally recording information on a metalized

To record images, including multicolor representation of colored images on electrosensitive coated paper in which a metallized coating is burned off from a substrate which may be either transparent or opaque, color element information is applied to the substrate, for example in form of dots, so that electrodes traveling across the substrate, or a comb electrode with multiple electrode tips, suitably energized, can expose, by burning off of the metallized coating, the underlying color dot. The color dots can be prepared in accordance with the well-known television color pattern or by applying yellow, green and red dots, in recurring periodic sequence, along the line to be scanned. For alignment of the recording head with the respective dot, markers are prederably provided on both sides of a recording strip, so that synchronization between recording pulses and actual color dots on the paper is obtained in spite of variations of the paper from a standard, occasioned, for example, by dampness or moisture absorbed by the paper.

Multicolor recording carrier and method of recording

To render the grey scale of recording on an electrosensitive recording medium (16) independent of voltage applied by an electrode (22) while maintaining a predetermined relationship between a command voltage (U.sub.c) and the resulting grey scale of the recording, the command voltage (U.sub.c) is compared in a comparator (44) with energy being supplied from an external source through a coil (32) having a primary winding (34) to which a capacitor (36) is connected in parallel to form an oscillatory circuit by a transistor (40). Upon controlling the transistor to conduction, for example in pulses supplied by a pulse source (48), energy will be stored in the L/C circuit 34/36 until the transistor is controlled to cut off when the command signal (U.sub.c) and a signal across a dropping resistor (42) indicates a predetermined relationship, for example equality, and representative of the energy required to burn out an area of the metalized coating corresponding to the selected grey scale. Transition of the transistor (40) to cut off or blocking state results in a pulse being transmitted to a secondary winding (50) coupled with the primary (34) of the coil, the secondary being coupled to the writing electrode. Thus, the voltage across the writing electrode (22) and the metalized coating (20) of the recording carrier (16) will be independent of the applied signal, but the energy content thereof varying in accordance with the applied signal. The result will be a burn-out trace, the width of which underneath the recording stylus varies (see FIG. 3) in accordance with applied energy, leaving variable amounts of non-removed metalized coating on the carrier, thus resulting in a grey tone, similar to half-tone printing, of the applied command signal.

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Cheseaux-sur-Lausanne, Switzerland

Jean-Claude Schlup