Method and apparatus for electrographic drawing

Claim 7

A method as defined in claim 3 in which the modifying of the electrical information to be recorded comprises the steps of: applying said clock pulses and electrical information to be recorded to said gate means (N0) to produce gated pulses of said information; deriving, from said gated pulses, pulses of a different time length less than said burnout period, and applying said derived pulses to the signal input of said multiplexer.

Claim 8

Apparatus for displaying information on electrosensitive sheet material, the electrographic effect on which is limited by a localized burnout characteristic comprising: an array of a multiplicity of adjacent writing electrodes electrically insulated from each other; a clock pulse generator; gate means (N0) for producing gated pulses timed by said clock pulses from a signal representative of information to be displayed; demultiplexing means (31) having a successive sequencing interval, determined by said clock pulse generation, at least as long as the time required to produce local burnout on said sheet material and including a binary counter (15) responsive to said clock pulses for distributing said pulses produced in response to operation of said gate means in sequence to the individual writing electrodes of said array, said gate means accordingly being the same for all pulses, and circuit means incorporated in said gate means for assuring that the duration of pulses supplied to said demultiplexing means in response to operation of said gate means is less than the time required to produce local burnout on said sheet material.

Claim 9

Apparatus for displaying information on electrosensitive sheet material, the electrographic effect on which is limited by a localized burnout characteristic comprising: an array of a multiplicity of adjacent writing electrodes electrically insulated from each other; a clock pulse generator; gate means (N0) for producing gated pulses timed by said clock pulses from a signal representative of information to be displayed; demultiplexing means (31) having a successive sequencing interval, determined by said clock pulse generation, at least as long as the time required to produce local burnout on said sheet material and including a binary counter (15) responsive to said clock pulses for distributing said pulses produced in response to operation of said gate means in sequence to the individual writing electrodes of said array, said gate means accordingly being the same for all pulses, and circuit means incorporated in said gate means for assuring that the duration of pulses supplied to said demultiplexing means in response to operation of said gate means is less than the time required to produce local burnout on said sheet material.

Claim 10

Apparatus as defined in claim 5 in which said circuit means incorporated in said gate means is a monostable pulse forming means (40) of adjustable pulse length interposed between said gate means and said multiplexer.

Claim 11

Apparatus as defined in claim 5 in which a multiplicity of controlled semiconductor devices (T0, T1, T2 . . . T15) are interposed between the outputs of said demultiplexing means (31) and the respective writing electrodes (S0, S1, S2 . . . S15) of said array to control the energization of said writing electrodes.

Claim 12

Apparatus for displaying information on electrosensitive sheet material, the electrographic effect on which is limited by a localized burnout characteristic, comprising: an array of a multiplicity of adjacent writing electrodes electrically insulated from each other, said electrodes of said array being disposed in a plurality of sub arrays (21, 22, 23, 24, 25), each comprising the same number of writing electrodes (S0, i, S1, i, S2, i . . . S15, i); a clock pulse generator; monostable gate means (N0) for producing, from a signal representative of information to be displayed, gated pulses timed by said clock pulse generator and having a duration less than the time required to produce local burnout on said sheet material; a plurality of functionally identical demultiplexers (31, 32, 33, 34, 35) timed by said clock pulse generation and respectively arranged to distribute said gated pulses in turn to each sub array (21, 22, 23, 24, 25) of said writing electrodes, each of said demultiplexers hiving two signal inputs and having individual gate means connected between a first signal input of said demultiplexer and the output of said monostable gate means, said individual gate means having a first input to which the output of said monostable circuit is connected and two additional inputs; a resetting circuit; and a plurality of flip-flop circuits are interconnected with each other, with the second and third inputs of said individual gate means and with the second inputs of said demultiplexers and also with said resetting circuit, so that each of said demultiplexers will be activated for a complete cycle of operation in sequence while the others of said demultiplexers are furnishing no output, whereby each one of said writing electrodes will be activated in turn.

Claim 13

Apparatus for displaying information on electrosensitive sheet material, the electrographic effect on which is limited by a localized burnout characteristic, comprising: an array of a multiplicity of adjacent writing electrodes electrically insulated from each other, said electrodes of said array being disposed in a plurality of sub arrays (21, 22, 23, 24, 25), each comprising the same number of writing electrodes (S0, i, S1, i, S2, i . . . S15, i); a clock pulse generator; monostable gate means (N0) for producing, from a signal representative of information to be displayed, gated pulses timed by said clock pulse generator and having a duration less than the time required to produce local burnout on said sheet material; a plurality of functionally identical demultiplexers (31, 32, 33, 34, 35) timed by said clock pulse generation and respectively arranged to distribute said gated pulses in turn to each sub array (21, 22, 23, 24, 25) of said writing electrodes, each of said demultiplexers hiving two signal inputs and having individual gate means connected between a first signal input of said demultiplexer and the output of said monostable gate means, said individual gate means having a first input to which the output of said monostable circuit is connected and two additional inputs; a resetting circuit; and a plurality of flip-flop circuits are interconnected with each other, with the second and third inputs of said individual gate means and with the second inputs of said demultiplexers and also with said resetting circuit, so that each of said demultiplexers will be activated for a complete cycle of operation in sequence while the others of said demultiplexers are furnishing no output, whereby each one of said writing electrodes will be activated in turn.

Claim 14

Apparatus as defined in claim 8 in which one or more of said sub arrays of writing electrodes are mounted on an electrode comb consisting of individual segments which contain writing electrodes, driving semiconductor devices therefor, and demultiplexers.

Claim 15

Apparatus as defined in claim 9 in which the writing electrodes are made up of tungsten wires.