JPS5833112B2 - Kiroku house - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording device that performs recording by using a plurality of recording electrodes and a plurality of counter electrodes and applying the voltage of the recording electrode and the voltage of the counter electrode additively to a recording medium.

Conventionally, as this type of recording apparatus, there is an electrostatic recording apparatus as shown in FIG.

That is, a plurality of recording electrodes 1□ to 1 m, 2. ~2m,・
...n1 to nm are arranged in a line facing the counter electrodes 11□ to 11n, but in order to reduce the number of drive circuits, they are equally divided into a plurality of electrode rows, and each electrode row has a common drive circuit 12□.
Connected to ~12m.

The plurality of counter electrodes 111-11n are the plurality of recording electrodes 11-i.
mt . . . n1 to nm, each of the electrode rows faces each other via a recording medium, and is connected to drive circuits 131 to 13n, respectively.

These drive circuits 13, to 13n each have a transistor T
R1, and resistors R1 to R4. Normally, when the input voltage makes the transistor TR1 conductive, the driving voltage to the counter electrode becomes 0. When the input pulse makes the transistor TR non-conducting, the driving voltage to the counter electrode becomes the power supply voltage. +E
Make it.

Input pulses are sequentially applied to the drive circuits 131 to 13n, and a power supply voltage +E is sequentially applied to the counter electrodes 111 to 11n for scanning.

Each of the drive circuits 121 to 12m is a level chic circuit consisting of a constant voltage diode ZD for input circuit protection and a coupling capacitor C1, a transistor TR2, and a resistor R5 to
Normally, the transistor TR2 is non-conducting and the voltage of the recording electrode is set to O, and the input signal causes the transistor TR
When 2 becomes conductive, a power supply voltage -E is applied to the recording electrode.

In the recording medium, an electrostatic latent image is formed in the area where the recording electrode is applied only when the power supply voltage -E is applied to the recording electrode and the power supply voltage E is applied to the counter electrode at the same time and 2E is applied.

This recording medium has a recording electrode of 11 nm and a counter electrode of 11□ to 1 nm.
An electrostatic latent image is sequentially formed line by line while being moved in a direction perpendicular to the 1n arrangement direction, and recording is performed by developing this electrostatic latent image.

However, in such a recording device, the drive circuit 121
~12m, 13. ~13n requires two power supplies with different polarities, which complicates the power supply, and the drive circuit 12□~
A level shifter is required at the 12 m input stage, making the circuit complicated.

Therefore, as shown in FIG. 2, drive circuits 13□ to 13n
The power supply voltage is +2E, and the drive circuit 121 to 12m
The power supply voltage is set to +2E, and the level shifter is removed.
Generally, there is a device in which the transistor TR2 is made non-conductive and the transistor TR2 is made conductive by an input signal.

According to such a recording device, only one power supply system is required, which simplifies the system, and the level chicness becomes T4, which simplifies the circuit.

However, the withstand voltage between the recording electrodes and between the counter electrodes is 2
E or higher is critical and there is a manufacturing problem.

Also, the high voltage power supplies present a variety of difficult problems.

The present invention aims to eliminate the above-mentioned drawbacks and provide a recording device that can not only simplify the power supply and circuit, but also lower the voltage of the power supply and reduce the withstand voltage between each electrode. That is.

An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 3, a plurality of recording electrodes 21. ~21 m
, 221~22m...2n1~2nm is the counter electrode 3
Drive circuits 321 to 3 are arranged in a line facing the electrodes 321 to 31n, and are equally divided into a plurality of electrode rows, and are common to each electrode row.
2m each.

A plurality of counter electrodes 31. ~31n is a plurality of recording electrodes 211~
2 nm, each electrode plate row is arranged to face each other with a recording medium interposed therebetween, and is connected to drive circuits 33, to 33, respectively.

This drive circuit 33. ~33n are each composed of an NPN transistor TR3, a resistor Is~R1□, and a capacitor C2, and the base of the transistor TR3 is connected to the input terminal via an input resistor R8, and is connected to the ground by a resistor for earthing. R9 is connected.

The emitter of the transistor TR3 is grounded, and the collector of the transistor TR3 is connected to a positive DC power supply <+E> via a collector resistor R1o.

In addition, the collector of the transistor TR3 is connected to the DC power supply 〈+E
), and the connection point of capacitor C2 and resistor R12 is connected to the counter electrode.

Capacitor C2 and resistor R12 constitute a differentiating circuit, and resistor R71 is for reducing rush current from the differentiating circuit to transistor TR3.

Drive circuits 32□ to 32m are NPN transistors TR
4 and resistors R13 to R15, and the transistor TR
, is connected to the input terminal via an input resistor R13, and a bias resistor R14 is connected between the base and the ground point.

The collector of the transistor TR4 is connected to a DC power supply <+E> via a collector resistor R15, and is also connected to a recording electrode.

In the drive circuits 33□ to 33n, normally, when the input voltage is 0, the transistor TR3 is turned on and the power supply voltage +E> is applied to the counter electrode via the resistor R12.

At this time, the capacitor C2 is charged to the power supply voltage +E>.

When transistor TR3 becomes non-conductive due to a negative input pulse, the charge in capacitor C2 is discharged to the counter electrode, and the voltage at the counter electrode becomes twice <+2E> than the power supply voltage <+E>.

The drive circuits 331 to 33n perform scanning by sequentially applying input pulses to the counter electrodes 31 and 31n from +E to +2E. It becomes conductive and a power supply voltage <+E> is applied to the recording electrode.

When transistor TR4 becomes conductive due to a positive input signal,
Input signals are sequentially applied to the drive circuits 321 to 32m that set the voltage of the recording electrodes to O at a timing m times the input pulse of the drive circuits 331 to 33n.

Then, when the voltage of the recording electrode becomes O and at the same time the voltage of the counter electrode becomes +2E, the recording medium is charged only in the area between the electrodes, and an electrostatic latent image is formed.

This recording medium has a recording electrode of 211 to 2 nm by a driving device.
While being moved in a direction perpendicular to the arrangement direction of the counter electrodes 31□ to 31n, an electrostatic latent image is sequentially formed line by line, and this electrostatic latent image is developed by a developing device.

FIG. 4 shows another embodiment of the present invention, in which a diode D is connected in parallel with the resistor R12 in FIG.

This diode D operates to remove a negative component from the output of the differentiating circuit composed of the capacitor C2 and the resistor R72, and to improve the rise of the voltage at the counter electrode when the power is turned on.

When the period of the input signal of the drive circuits 321 to 32m is extremely large compared to the input pulse width of the drive circuits 33 and 33n, the diode D is omitted and the value of the resistor R12 is set to a large value to increase the time constant of the differentiating circuit. The negative component of the differential output can be removed by

Note that the present invention is not limited to the above embodiments,
Various modifications can be made without changing the gist.

For example, a method has been proposed in which electrostatic recording is performed by placing a recording electrode in close contact with the charge retaining layer of a recording medium consisting of a charge retaining layer and a conductive layer, and placing a counter electrode adjacent to the recording electrode. Can be applied.

Further, when a voltage of +2E is generated between the end of the adjacent counter electrode and the opposing recording electrode, a ghost may be recorded on the recording medium.

Therefore, by selecting two or more counter electrodes at the same time and adding +2E to them, and selecting a plurality of recording electrodes facing these counter electrodes except one part on each side and setting them to 0, the selected recording electrodes A method has been proposed in which the voltage of the counter electrode is made substantially uniform for the area of the recording medium where the counter electrodes are opposed, and another method is available in which every other counter electrode is selected.

The present invention can be applied to both types.

Furthermore, in the above embodiment, the polarity of the DC power supply may be reversed, and the present invention can be applied to recording methods other than the electrostatic recording method described above, and the recording electrode and counter electrode may be arranged in multiple lines. It may be provided.

As described above, the recording device according to the present invention has a drive circuit that applies a higher voltage to one of the recording electrode and the counter electrode than when not recording, and applies a lower voltage to the other than when not recording, The recording power source is one system with the same polarity and lower voltage than sufficient for recording, and the drive circuit has a differentiator that differentiates the voltage applied to the one electrode to make it higher than the power supply voltage. Since it has a circuit, it is possible to simplify the power supply and lower the voltage, which in turn makes it possible to simplify the circuit, and has the effect of lowering the withstand voltage between the recording electrodes and between the counter electrodes.

[Brief explanation of the drawing]

1 and 2 are circuit diagrams each showing a part of a conventional recording apparatus, and FIGS. 3 and 4 are circuit diagrams each showing a part of an embodiment of the present invention. 211-20m...recording electrode, 311-31n...
Counter electrode, 321-32m, 33□-33. ...Drive circuit, TR3, TR4...Drive transistor, C2.
... Differential capacitor, R1□... Differential resistor.

Claims (1)

[Claims] 1. Using a plurality of recording electrodes and a plurality of counter electrodes that are divided into groups and commonly connected at corresponding positions, the voltage of the recording electrode and the voltage of the counter electrode are time-divided. In an apparatus that performs recording by applying an additive action to a recording medium, applying a voltage to a recording power source and a voltage such that the voltage applied to the recording medium is insufficient for recording when not recording, to the recording electrode and the counter electrode, During recording, in order to make the voltage applied to the recording medium sufficient for recording, a voltage higher than that during non-recording is applied to one of the recording electrode and the counter electrode, and a lower voltage is applied to the other than during non-recording. The recording power source is one system with the same polarity and has a voltage lower than that sufficient for recording. A recording device characterized by having a differentiating circuit that makes the voltage higher than the power supply voltage.