Heimann Gmbh

Juergen Meyer

Norbert Schaaf

Claus Kunze

Irmtrud Wendling

A contactless conductance potentiometer is provided in which the total conductance between two electric terminals can be selectively divided, the two parts being equal to the total conductance. This can be accomplished by using a ring-shaped photoconductor on a substrate, the ring-shaped photoconductor being divided along a diametral line. One exterior electrode is located on the substrate in a position surrounding one portion of the ring-shaped photoconductor and being in contact with the marginal edge thereof. The remaining part of the ring-shaped photoconductor is in marginal contact with the second exterior electrode. A tapping electrode is mounted inside the ring-shaped photoconductor and is in marginal contact with the inner edge of the ring-shaped photoconductor. The construction is such that when the photoconductor is exposed to light falling on the combined ring-shaped parts, current will flow through the exposed part of the photoconductor between the tapping electrode and one of the two exterior electrodes.

Contactless conductance potentiometer

The present invention involves a structure of a contactless ohmic resistance potentiometer. A current path between two exterior electrodes is provided by a photoconductor, and a means is provided for causing an exposure of a portion of the length of the photoconductor between one exterior electrode and a tapping electrode. This permits a voltage division between two exterior electrodes. The usable surface of the photoconductor layer is delimited by an exterior electrode and a tapping electrode having a definite geometric course between the exterior electrodes. The distance ratio from the tapping electrode to the two exterior electrodes is varied by means of displacing the exposure of the photoconductor which causes the active partial surface of the photoconductor to be varied at will.

A contactless resistance potentiometer

A photosensitive matrix having a substrate with a group of row conductors, a group of column conductors extending across the row conductors to form a plurality of points of intersection with a photoconductive cell in series with a rectifier adjacent each point to inteconnect the row conductor to the column conductor characterized by the substrate being of a material which is at least approximately light impermeable in the light-sensitive spectrum of the photoconductive cells so that light projected on one cell is not conducted by the substrate to create a false signal in adjacent cells. Preferably, the substrate is a ceramic material which has been dyed black and the dyed black ceramic material consists of Al.sub.2 O.sub.3 mixed with Fe.sub.2 O.sub.3.

Photosensitive matrix with substrate

A manipulatable read-only memory, particularly a punched card read device, having conductor paths comprising row and column conductors, disposed in a matrix formation in the manner of a cross-bar distributor, adapted to be operatively connected at their respective intersections by a corresponding photo-resistor and a rectifier containing a blocking contact, which are connected in series with the blocking contact being formed directly on one of the two conductors.

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Taunusstein, Germany

Juergen Meyer