DE1904599B2 - CIRCUIT FOR THE ELECTROSTATIC RECORDING - Google Patents

Description

3 4

Another known arrangement provides feed for electrostatic recording

are characterized by making use of the fact that the sharp ones, that is, the potential of a pin electrode only

initial voltage for generating the corona- two desired levels are obtained in order to ensure reliable

c discharge higher than the voltage to ensure upright drawing.

the corona is obtained from the corona surface. This 5 according to the invention is provided for this purpose that the

Arrangement is made with reference to Fig. 3 output voltages of the first pin electrode control

explained. With 20 the recording medium is circle and the second pin electrode control circuit

draws, and with 21 the electrode arrangement is of different polarity and that each

referred to, which are connected to groups of pin electrodes 211, Stirt electrode via a diode to ground

212, 213 ... is provided. In the electrode arrangement, the output voltage of the pin electrode

tion are as shown in FIG. 4 shows the excitation electrodes control circuit of the polarity blocked by the diode

24 is provided near the pin electrodes 23. Fig. 5a is dimensioned so that the recording can be triggered,

shows a section of the in FIG. 4 shown elec- while the output voltage is opposite

electrode arrangement. When a voltage + V polarity of the other pin electrode control circuit so

(Fig. 5b) to the electrode assembly 23 for 15 is dimensioned that when the two pin electrode

drawing of the electrostatic charge pattern and control circuits are controlled at the same time, which are connected to the

at the same time a voltage - V, i.e. with the opposite pin electrode applied resulting voltage

The polarity set to the excitation electrode 24 is less than the output value for the recording

the part which corresponds to the position of the · "column.

are applied by the control circuit 26, the 20 In this embodiment, recording of only high voltage for the use of the corona takes place on one when a pin electrode with the voltage of only the pin electrodes 211, 212, 213 ... is applied to a pin electrode control circuit is acted upon,
which the two tensions have been given. The advantage of the subject matter of the invention, and accordingly, the generation of corona is facilitated, is that when the output voltage occurs and then the corona is maintained by the voltage 25 of only one pen electrode control circuit, which draws applied to the pen electrode, while being up, and the electrostatic image is recorded. The output voltage of both pin electrodes occurs - in this case it is therefore not necessary to have a control circuit that ensures that the recording is pressed in independently of a plurality of counter electrodes.

on the opposite side of a plurality of columns 30 The invention is illustrated with reference to FIGS. 6 to 9

to be provided, but it is only necessary to explain one of the drawings, where are

single counter electrode 25 opposite all columns F i g. 6 a representation to explain the elec-

to be arranged horizontally, and the image can also be upstatic recording according to the invention,

are drawn by this counter electrode 25 F i g. 7 is a circuit diagram of the circuit according to FIG

is grounded or by a constant bias 35 Invention,

is applied to this electrode. In this Auf- F i g. 8 shows the output voltage

drawing is the formation of the pin electrodes of a pin electrode control circuit and

complicated, and the control of the excitation voltage F i g. 9 shows the output voltage

voltage of the excitation electrodes and the duration of the other pin electrode control circuit.

of the application must be carried out with a very high degree of accuracy. 6 denotes 30 a recording

are executed. carrier made from a film of highly insulating

There is also an electrographic recording material or a paper which is known with a drawing device with η columns in a line, a thin layer of a highly insulating material and m pin electrodes in a column, is coated. With 31 the electrode arrangement of the one arranged opposite the pin electrodes 45 is designated, and with 32 the potential plate is be-Potentialplatif, pin control circuits for simultaneous drawing. The electrode arrangement 31 contains η pin control of the electrode groups 311, 312, 313... For recording pin electrodes and gap control circuits of η columns in a row. Each pin electrode for generating signals for controlling the pin group includes m pin electrodes a, b, c, d and e. The electrodes are provided through each column. Each 50 potential plate 32 generates a voltage difference between the pin electrodes via a series resistor and a constant pin control circuit and a second voltage, e.g. B. earth potential, is applied to the potential-parallel series resistor on a gap control plate 32 each.

Circuit connected. In this known arrangement, according to FIG. 7 are pin electrodes, which in equi-order a recording is carried out at the location of a 55 Valentin positions within the pin electrodes a, b, c, pin electrode, on which two positive potentials d and e , which act the pin electrode potentials, are arranged. A pin electrode, the applied groups of which form 311, 312, 313. connected and are durcb m first pin electrode when a positive potential is present, controlled control circuits 34 via resistors RB, an intermediate potential to the pin electrodes <> ° On the other hand, each pin electrode group 311, 312, applied, corresponds the any of the selected level 313 ... connected to one another and together, speaks, which is why the intermediate potential is set below the and these pin electrode groups 311, 312, 313 ... critical voltage. In fact, the range between 0 volts and the critical circuits 33 are controlled via the resistors RA separately by η second pin electrode controllers. Any voltage is relatively low, and it is difficult to ground two levels within this range via a diode D in the reverse direction. F i g. 8 shows a profile of the voltage ordering. + VA generated by the pin electrode control circuit 34

The invention has for its object to be applied, and F i g. 9 shows a course of a

Voltage - VB applied by the pin electrode control circuit 33.

According to FIG. 7, recording can be performed only by the pen electrode a of a pen electrode group 312 by controlling the control signal 341 in the pen electrode control circuit 34 and not controlling the control signal 332 in the pen electrode control circuit 33. At this time, the potential of the pin electrode α of a pin electrode group 312 becomes ίο

VA RA + RB

RA and RB according to FIG. 7 and VA according to FIG. 8 must be determined so that the voltage is higher than the critical voltage VL of the recording medium according to FIG. 1 is.

The potentials of the pen electrodes which do not effect recording will be described below. As with the pin electrodes b to e of the pin electrode groups 311 and 313, the control signal 342 in the pin electrode control circuit 34 is not controlled, and the control signals 331 and 333 in the pin electrode control circuit 33 are controlled. For this reason, the potentials of the pin electrodes

RA + RB ' ^RA '

thus negative, but are actually held at around 0 V by the diodes D inserted in the pin electrode circuits. This value is lower than the critical voltage VL of the recording medium shown in Fig. 1, and therefore the recording is not made by the pin electrodes b to e the pin elec- 3; Trode groups 311 and 313 executed. Next, the pin electrodes α of the pin matrix electrode groups 311 and 313 are controlled by the control signal 341 of the pin electrode control circuit 34 and the control signal 331 or 333 of the pin electrode control circuit 33, and therefore the potentials of these pin electrodes are controlled

VA -

VA + VB RÄT ~ RB

RA.

45

If VA and VB are determined so that the voltage is less than the critical voltage VL of the recording medium according to FIG. 1, the recording will not be carried out. Further, as with the pin electrodes b to e of a pin electrode group 312, neither the pin electrode control circuit 34 nor the pin electrode control circuit 33 is controlled, and therefore the potentials of these pin electrodes become 0 V. When the values of VA. VB. RA. RB and VL z. B. are given as

RA = RB = 10 kOhm. j VA = i VB] = 1000 V and VL = 300 V.

For example, the voltage of the pin electrode α of a pin electrode group 312 which performs the above-described recording of FIG. 7 can be expressed as

VA RA l · RB

= ^ _{: w} ^ _W7W ., 0 10- ¹ V = 500 V.

Since this value is higher than the critical voltage VL = 300 V of the recording medium, recording is carried out.

The voltages of the pin electrodes H until e of the pin electrode groups 311 and 313 other than the recording according to FIG. 1 described above. 7 will run

RA + RB
-1000

10 10 ³ V = -500 V.

The voltages are held at about 0 V by the diodes D. Since this value is lower than the critical voltage VL = 300 V of the recording medium, the recording is not carried out. The voltages of the pin electrode α of the pin electrode groups 311 and 313 which do not perform the above-described recording of Fig. 7 become

VA -

VA + VB

RA + RB

= 1000 -

1000 + 1000

10 ■ I0 ³ + 10

RA

10 ίο ¹ ν = ov.

Since this value is lower than the critical voltage VL = 300 V of the recording medium, recording is not carried out.

Next, another embodiment of the operation for recording only by the pen electrode α of a pen electrode group 312 in the manner shown in FIG . 7 described circuit according to the invention. The same result as described above can be obtained and very good recording can be carried out by not controlling the circuit 341 in the pen electrode control circuit 34 and controlling all of the other pen electrode control circuits and by controlling only the circuit 332 in the pen electrode control circuit 33 all other pin electrode control circuits cannot be controlled. Here it is necessary to move the diodes in the opposite direction to FIG. 7 to act and to produce a negative electrostatic charge image on the recording medium or to cause the polarity of the signal voltages shown in FIGS. 8 and 9 to be reversed.

1 sheet of drawings

Claims (1)

applied to both electrodes and thus an elec- Claim: static charge image on the recording medium is formed. The relationship between the an Circuit for electrostatic recording voltage applied to the recording medium and with m ■ η pen electrodes, where a column in s is the charge density of the electrostatic image in pen electrodes and recording for F i g. 1, ie the charge density increases pron columns in a row and is proportional to the applied voltage when the voltage applied to the pin electrodes above the recording is higher than a certain criterion and a potential plate below the table voltage VL On the other hand, an electrical recording medium is arranged with »i first ία trostatic recording does not take place if the pin electrode control circuit for the simultaneous applied voltage is lower than the critical voltage controlling the pin electrodes of equivalent locations VL . It can generally be said that each column and with π second pin electrode corona discharge has a great influence in the initial control circuits for separately controlling each column of the formation of the image. It is therefore known that the electrodes and resistors between the control circuits and the pen electrodes, if the image is generated in an atmosphere, are arranged so that the electrostatic formation enables the corona formation . The voltage for drawing on the recording medium from the generation of the corona is higher than the voltage applied by the pin electrode, which is used both to maintain the introduced corona. A wide rod control circuit operating through the first and second pin electrode 20 using this property is selected, as a result of which the recording device has become known, characterized in that the output voltage is only applied at a high voltage when the first pin electrode control circuit (34) forms corona formation will. Using and the second pen electrode control circuit (33), the property of electrostatic recording, are of different polarity and that each 25 as has been described above, this pen electrode is connected to ground via a diode device for generating an electrostatic, wherein the output voltage of the Stiftelek image a recording paper, which is measured with a film trodensteuerkreises (34) of the diode or a thin layer of a highly insulating blocked polarity (+ VA) so that material is coated, between two electrodes the recording au ^cl can be eyed while arranged the 3 °, wherein said one pin electrode for on-Ausgangsspannun <5 opposite polarity draw the electrostatic image by a signal (-V B) is the other Sttelektrodensteuerkreises and the other electrode is dimensioned as a counter electrode (33) so that when the two pin acts and tensions are reversed The polarity of the two electrode control circuits (33, 34) can be seen simultaneously in such a way that the two electrodes are applied to the pin electrode (311a) in such a way that the sum of the resulting voltage is less than that of the critical voltage VL and is the trigger value (VL) for the recording. Record image. F i g. Fig. 2 explains this known electrostatic recording method. The recording medium 10 40 is moved up (in the drawing), and the Electrode arrangement 11 consists of a plurality of columns and groups of pin electrodes 111, The invention relates to a circuit for the 112, 113 ..., and the electrostatic recording at equivalent points with m ■ η pin electrodes, arranged pins under the pins a, b. c. d and e, where one column contains m pin electrodes and 45 which form the groups of pin electrodes, recording for η columns in a row are interconnected and carried out with the corresponding ones, and with the pin electrodes above the open control circuits 121, 122, 123. .. the control device drawing carrier and a potential plate under the device 12 are connected. On the other hand, Gegsnelek recording media are arranged, with m first electrodes 131, 132, 133 ... of a group 13 of counter-pin electrode control circuits for simultaneous control electrodes, the pin electrodes are arranged opposite the pin electrodes at equivalent positions each and are respectively connected to the control circuits 141,142,143 ... column and connected to η second pin electrode control circuits of the control device 14. When recording for separately controlling each column of the electrodes, an electrostatic image is selected a voltage as well as with resistances which are arranged between the control by controlling the device 12, which rotate accordingly, and the pen electrodes, 55 being the image to be recorded. to which the electrostatic recording is applied to the recording electrode assembly 11 and at the same time voltage carrier is carried out from the pen electrode, a voltage of reversed polarity ar is applied through both the first and second the counter electrode selected at the position of the pen electrode control circuit is. Column is arranged in which the image through the The prior art is now to be recorded using the 6 ° control device 14. The Fig. 1 to 5 b of the drawing explained. desired image is formed in the required columns. An electrostatic latent image can be recorded on one position, and this is successively repeated by electrostatic recording means column by column, and the recording formed, whereby the recording drawing of one line is completed. This known "medium, which has a thin layer of a ^high-6 5 means that the electrode is the advantage ii insulating material easier between two electron manner can be constructed and maintained dal trodes, the angc- opposing only a a small number of electrode control circuits are arranged, and a voltage between them is required.