JPH0655767A - Electrostatic recorder - Google Patents

Abstract

PURPOSE:To provide an electrostatic rcorder where an ion flow recording head are made thinner and smaller. CONSTITUTION:An electrostatic recorder comprises an ion flow recording head in which a head support 6 holds an ion generator 2, a control electrode 3 in which an ion passage 3a is formed, drive circuit boards 5a and 5b each of which is packaged with a driver IC 4 which drives while it controls according to an image signal an amount of ions generated by the ion generator 2 and passing through the ion passage 3a of the control electrode 3. The drive circuit boards 5a and 5b in the grooves 6d and 6e made in both sides of the head support 6 are connected via bonding wires 28 to the control electrode 3 disposed along both the sides of corners 6b and 6c cut in the shape of C after the ion passage 3a is positioned along the edge of the head support 6. Lead wires 32, 33 and 34 drawn from the ion generator 2, the control elctrode 3 and the drive circuit boards 5a and 5b are connected via junction terminals 31 provided on both the sides of the head support 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrostatic recording device,
In particular, the present invention relates to an electrostatic recording apparatus of the type that forms an electrostatic latent image on a recording medium using ions.

[0002]

2. Description of the Related Art In ion deposition recording, ions generated by corona discharge in the air (corona ions) are directly controlled according to an image signal to form an electrostatic latent image, which is developed and hard recorded. This is a type of non-impact recording electrostatic recording method for obtaining a copy.

In this type of electrostatic recording apparatus, an ion flow recording head is used instead of a heat-sensitive recording medium utilizing a laser optical system and a photoconductive layer in a laser printer which forms an electrostatic latent image by using a light beam. A dielectric recording medium is used.

The concept of generating ions in the air for use in electrostatic recording is older than that of laser printers, and a metal electrode is heated to a high temperature in the air and at the same time a high voltage is applied to generate ions for electrostatic recording. As a method, Seleny in 1938
Although it was announced by i, it has not been put to practical use.

Further, the US Delfax Company noted that high-density ions are generated when a high-frequency high voltage is applied to two electrodes sandwiching an insulating layer, and succeeded in commercializing it as a label printer in 1982. ing.

According to this method, a high frequency high voltage of 1 MHz and 2.8 KV _PP for generating high density ions and a voltage of 600 V for carrying ions to a recording medium are used as image signals for each electrode corresponding to an image point. According to this method, binary high-speed recording (500 sheets / minute, equivalent to A4) is performed, and it is said that a high-hardness alumina recording medium can be used to perform large-scale printing with maintenance once every 100,000 sheets.

This method is disclosed, for example, in USP 4,155,0.
93, Japanese Patent Laid-Open No. 54-53537 and the like.

These are recording methods of irradiating a dielectric recording medium with an ion stream to form an electrostatic latent image and developing it to form an image.

The electrostatic recording method using the ion stream is superior to the electrophotographic recording using an optical input such as a laser printer in terms of high speed and maintainability.

Regarding the point of speed, in the method using the ion flow, 330 sheets / minute (A4) was announced (SPSE, The 4th int
ernational congresson advances in non-impact print
ingtechnologies: March 20-25,1988, pp394-397), which is the recording speed of ordinary commercial laser printers 6-
It reaches several tens of times of 8 sheets / minute (A4).

In addition, in the recording method using the ion current, a dielectric recording medium having a high volume resistivity (10 ¹⁴ to 10 ¹⁶ Ω · cm) can be used. As the dielectric recording medium, for example, Al ₂ O _{3 having} a high hardness of an inorganic insulator or an organic insulator resistant to ozone generated when ions are generated can be used. There is little decrease, surface deterioration due to ozone, material deterioration due to toner surface adhesion, and stable recording is possible for a long time.

Further, since the recording is performed by directly controlling the ion for each image point and directly giving an electric charge to the dielectric recording medium, the recording speed is determined by the performance of the ion flow recording head, and the recording medium characteristics such as the laser printer are determined. Recording is possible without being affected.

As described above, the ion deposition recording method has the following features.

(A) Since a laser optical system (light source / rotary mirror scanning system) and a photosensitive recording medium as in a laser printer are not required, it is possible to reduce the recording cost by high-speed recording and downsize the apparatus.

(B) Since the pulse width of the recording image point can be modulated, an equivalent image quality can be obtained with a resolution of a fraction of the laser printer.

(C) Since the recording medium does not use a photosensitive member having (surface potential) dark decay, the charge holding time is long,
You can record intermittent feed.

(D) High-speed one-bus color recording can be performed by successively forming images on a recording medium.

FIG. 10 is a schematic diagram showing an ion flow recording head of an electrostatic recording apparatus disclosed in Japanese Patent Laid-Open No. 54-53537, which is an example of a conventional electrostatic recording apparatus.

As shown in this figure, in this solid-state ion flow recording head, a dielectric electrode 102 is provided on one surface (upper surface in the drawing) of a dielectric substrate 101, and ions are generated on the other surface (lower surface in the drawing). The respective ion generating electrodes 103 are provided, and the ion generating electrode 103 is provided with a slit (or hole) 104 for concentrating an electric field for easily generating ions.

When an AC voltage 105 is applied between the dielectric electrode 102 and the ion generating electrode 103, a high alternating electric field is generated in the slit 104 and high density positive and negative ions are generated.

Of the positive and negative ions thus generated,
Only the negative ions are selected by the high bias voltage 106 of 400 to 500 V, which is approximately the same as the electrostatic latent image potential applied to the ion generating electrode 103, and the dielectric recording medium 10 is selected.
Move in 7 directions.

The ions moving in the direction of the recording medium 107 are 400 to 500 V applied to the acceleration electrode 108 provided between the recording medium 107 and the ion generating electrode 103.
The recording medium 1 is accelerated by a high accelerating voltage 109.
When it reaches 07, an electrostatic latent image corresponding to the image signal is formed.

As described above, the control of the ion flow can be performed by turning on and off the bias voltage 106. The solid-state ion flow recording heads described above are arranged in a large number according to the number of image points.

[0024]

In the electrostatic recording apparatus having the conventional ion flow recording head described above, in order to control the ion flow, a bias voltage as high as the electrostatic latent image potential on the recording medium 107 ( 400 to 500 V or more) must be applied to the ion generating electrode 103 as a signal voltage. This is accomplished by switching the switch 110 in response to the image signal and applying the bias voltage 106.

As described above, the conventional ion flow recording head described above requires a high withstand voltage driver IC.
Since a high withstand voltage driver IC has a large mounting area due to heat radiation or the like, high-density mounting cannot be performed, and it has been impossible to make the solid ion flow recording head thin and compact.

The present invention has been made for the purpose of solving the above-mentioned problems, and an object of the present invention is to provide an electrostatic recording apparatus capable of reducing the thickness and size of an ion flow recording head.

[0027]

In order to solve the above-mentioned problems, the present invention is arranged along the main scanning direction on an end surface of a head support arranged to face a recording medium, with an insulating layer interposed therebetween. Having at least two electrodes arranged in close proximity,
Ion generating means for generating ions by corona discharge when an alternating voltage is applied between these electrodes, and is arranged between the ion generating means and the recording medium and arranged along the main scanning direction of the recording medium. A control electrode having first and second control electrodes between which an insulator having a plurality of ion passage holes for passing ions generated by the ion generating means to the recording medium side is interposed; 1,
The second control electrode is generated by the ion generating means which has one electrode as a fixed potential and selectively applies a potential having a predetermined potential difference with respect to the other electrode to the other electrode to pass through the ion passage hole. A solid-state ion flow recording head is integrally formed with a driving unit that controls the amount of ions according to an image signal, and the ions generated by the ion generating unit are placed between the first and second control electrodes. Through the ion passage hole controlled by the applied control voltage, to form an electrostatic latent image by irradiating on the recording medium to which the potential of the opposite polarity to the ions passing through the ion passage hole is applied, In an electrostatic recording apparatus for recording an image by developing this electrostatic latent image, a corner of an end face of the head support facing the recording medium is cut, and the ion passage hole is provided in the head support. Located on the end face of The control electrodes are fixed to both sides of the head support along the corners of the end face, and grooves are formed on both sides of the head support so that the control electrodes have substantially the same height as the control electrodes. The drive means is disposed on the head support, the control electrode and the drive means are electrically connected to each other, and the control electrode and the ion generating means are provided on at least one surface of the head support through a lead wire. A relay terminal for electrically connecting to the driving means.

[0028]

According to the present invention, since the recording medium is applied with a potential having a polarity opposite to that of the ions passing through the ion passage hole, the ions passing through the ion passage hole are accelerated and irradiated onto the recording medium. Therefore, the flow of ions passing through the ion passage hole can be controlled by the control voltage of a low voltage (for example, about 30V) applied between the first and second control electrodes, and thus the first and second control electrodes can be controlled. Since the withstand voltage of the driving means for driving and controlling the control electrode can be lowered, the driving means can be downsized.

Further, the drive means is provided in the grooves formed on both sides of the head support so as to be substantially at the same height as the control electrodes provided on both sides of the head support. It is possible to easily reduce the thickness and electrically connect the both.

Further, by cutting the corners of the end surface of the head support, the control electrodes are arranged along the corners, so that the control electrodes can be prevented from being broken and the short circuit can be prevented.

Further, since the lead lines from the ion generating means and the control electrode are connected to the driving means through the relay terminals and wired, the wiring can be concentrated, so that high density mounting is possible.

[0032]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to an embodiment shown in the drawings.

FIG. 1 is a schematic configuration diagram showing a solid-state ion flow recording head of an electrostatic recording apparatus according to an embodiment of the present invention, FIG.
FIG. 2 is a sectional view taken along line I-I of FIG. 1. As shown in both figures,
The ion flow recording head according to the present embodiment includes a plate-shaped ion generator 2 arranged to face a recording drum 1 which is a recording medium, and an ion generator 2 arranged between the ion generator 2 and the recording drum 1. Of the film-shaped control electrode 3 formed with the ion passage hole 3a for passing the ions generated in 1. in the direction of the recording drum 1 and the amount of ions generated in the ion generator 2 passing through the ion passage hole 3a of the control electrode 3. Drive circuit boards 5a and 5b on which a plurality of drive circuits (hereinafter, referred to as driver ICs) 4 for controlling and driving the image pickup device according to image signals are mounted
Are integrally formed and attached to the head support 6 made of a shellac substrate.

The recording drum 1 includes an Al drum 7 which is a conductive substrate, and a dielectric layer 8 made of fluorine resin or the like coated on the Al drum 7 to a thickness of about 10 to 50 μm.
And (see FIG. 3).

The ion generator 2 is detachably attached to a support plate 9 provided in a groove 6a formed in an end surface of the head support 6 facing the recording drum 1, and both sides of the support plate 9 are attached to the support plate 9. Adjustment screws 10a and 10b for adjusting the position of the control electrode 3 with respect to the ion passage hole 3a are attached.

As shown in FIG. 3, the ion generator 2 has a dielectric electrode 12 formed on a substrate 11 and having a thickness of several μm (about 2 to 3 μm) and a thickness of several tens of μm (about 20 μm). The insulating layer 13, the ion generating electrode 14 having a thickness of several tens of μm (about 18 μm) formed on the insulating layer 13, and the width of the ion generating electrode 14 formed at a position facing the dielectric electrode 12 are several. The shield electrode 16 is provided between the slits 15 of 10 μm (about 40 μm). The shield electrode 16 has the same potential as the ion generating electrode 14. Also,
The substrate 11 and the insulator layer 1 are provided on both sides of the ion generating electrode 14.
A hole 17 for air blowing is formed penetrating 3 and connected to an air supply source (not shown).

By blowing the compressed air to the control electrode 3 side from the air blowing hole 17b, the ions generated in the ion generator 2 can be stably moved to the control electrode 3 side, and the ion passage is achieved. It is possible to prevent the holes 3a from being clogged.

The back side of the ion generator 2 (support plate 9
The side) is provided with a heater (not shown), and the heat generated by this heater can stabilize the operation of the ion generator 2.

The control electrode 3 is composed of a first control electrode 19 and a second control electrode 20 made of, for example, 18 μm thick copper foil provided on both sides of an insulating substrate 18 made of, for example, 100 μm thick glass polyisid sheet. An ion passage hole 3a having a diameter of about 100 μm is formed so as to be located between the slit 15 of the ion generator 2 and the recording drum 1, and the dielectric layer 8 of the recording drum 1 is separated by about 500 μm.
m, about 100 from the ion generating electrode 14 of the ion generator 2.
It is arranged at a position separated by ˜500 μm.

The first and second control electrodes 1 are arranged in the sub-scanning direction (width direction of the ion generator 2) orthogonal to the main scanning direction of the ion generator 2 (length direction of the ion generator 2).
The reference numerals 9 and 20 are arranged in a plurality of rows along the main scanning direction, and the ion passage hole 3a located substantially in the center of the end surface of the head support 6 corresponds to the image point for recording on the recording drum 1. A plurality (for example, about 1000 in total) is formed.

The corners 6b and 6c of the head support 6 are shown in FIG.
As shown in FIG. 2, the control electrode 3 is provided with the control electrode 3 along the periphery of the C-cut corners 6b and 6c.
Are fixed to both sides of the same with an adhesive or the like.

The switching circuit 2 is provided between the dielectric electrode 12 of the ion generator 2, the ion generating electrode 14, and the shield electrode 16.
An AC power supply 22 for applying an AC voltage at the time of recording is connected via 1. In addition, the first control electrode 19 of the control electrode 3
A first DC power supply 24 for applying a positive control voltage to the second control electrode 20 at the time of recording is connected via a switching circuit 23 between the second control electrode 20 and the second control electrode 20. Between the shield electrode 16 and the control electrode 3, a second DC power supply 26 for applying a negative bias voltage to the first control electrode 19 of the control electrode 3 at the time of non-recording via the switching circuit 25 and a second DC power source 26 at the time of recording. A third DC power supply 27 that applies a positive bias voltage to the first control electrode 19 is connected.

Although the ion generator 2 and the control electrode 3 corresponding to one image point are shown in FIG. 3, in reality, the same ion generator 2 as described above is controlled in accordance with a plurality of image points.
And a plurality of control electrodes 3 each having an ion passage hole 3a.

The drive circuit boards 5a and 5b, on which a plurality of driver ICs 4 are mounted, are arranged in grooves 6d and 6e formed on the both sides of the head support 6 so as to be displaced in the front-rear direction. The upper surfaces of the substrates 5a and 5b are substantially flush with the control electrode 3 adhered to the surface of the head support 6. Part of the grooves 6d and 6e of the head support 6 is 2
The driver IC 4 is also formed inside the drive circuit boards 5a and 5b that are formed in steps and are located in the groove portions 6f and 6g in this portion.
Has been implemented.

The drive circuit boards 5a and 5b and the first control electrode 19 located on the front surface side of the control electrode 3 are connected via a bonding wire 28 and sealed with a resin material 29. The drive circuit board 5a is also provided. , 5b are fixed to the groove portions 6d, 6e of the head support 6 with an adhesive agent 30 or screws.

Further, since the insulating substrate 18 of the control electrode 3 is as thin as about 100 μm, the driving circuit substrates 5a, 5
the front and back surfaces of the control electrode 3 connected to the first end
In order to prevent the control electrode 19 and the second control electrode 20 from being short-circuited, as shown in FIG. 4, the tip end side of the second control electrode 20 located on the back surface side of the control electrode 3 is slightly shortened to Is filled with the adhesive 30.

Further, relay terminals 31 are provided on both sides of the control electrode 3 provided on both surfaces of the head support 6, and a lead wire 32 from the control electrode 3 is provided via the relay terminal 31.
A lead wire 33 from the high voltage circuit of the ion generator 2 is electrically connected to a lead wire 34 from the drive circuit boards 5a and 5b on which the driver IC 4 is mounted.

Next, the recording operation by the electrostatic recording apparatus equipped with the ion flow recording head according to this embodiment will be described.

First, before recording, the dielectric layer 8 of the recording drum 1 is uniformly charged with negative ions of about -600 V by a negative corona ion generator (not shown).

Then, from the AC power source 22 to the ion generator 2
The dielectric electrode 12 and the ion generating electrode 14, a predetermined AC voltage across the shielding electrode 16 (e.g., Voltage: 1～3KV _PP, Frequency: The number K~300KH _z) by applying a slit 15
Corona discharge is generated between them to generate ions. Although the density of the generated ions depends on the voltage and frequency of the AC power supply 22, a high density (for example, about 10 ⁻⁴ to 10 ⁻³ A / cm) that cannot be compared with the conventional corona charger can be obtained.

At this time, the control voltage V _c (about 30 V) is applied to the first control electrode 19 of the control electrode 3 from the first DC power supply 24 via the a ₁ contact side of the switching circuit 23, and Since the positive bias voltage V _b ⁺ (about 240 V) is applied to the ion generating electrode 14 of the ion generator ² from the third DC power supply 27 via the b ₁ contact side of the switching circuit 25, the ion generating electrode 14 And the first control electrode 19
Only the positive ions move to the first control electrode 19 side by the electric field E ₁ therebetween.

Further, the control voltage V _c (about 30 V) is applied from the first DC power supply 24 to the first control electrode 19 and the second control electrode 19.
The electric field E ₂ between the control electrodes 20 causes the first control electrode 19
The positive ions that have moved to the side are the ion passage holes 3 of the control electrode 3.
Pass a.

Since the surface of the dielectric layer 8 of the recording drum 1 is uniformly charged with negative ions of about -600 V in advance by a negative corona ion generator (not shown), the second control is performed. Due to the electric field E ₃ between the electrode 20 and the dielectric layer 8, the positive ions that have passed through the ion passage hole 3a reach the surface of the dielectric layer 8 and an inverted electrostatic latent image is formed on the dielectric layer 8. It

The recording operation described above is similarly performed independently in each of the plurality of ion passage holes 3a formed in the control electrode 3 corresponding to the image point.

Next, the toner image is formed on the dielectric layer 8 of the recording drum 1 by performing reversal development with a developing bias voltage of, for example, about -500 V using a one-component contact developing device (not shown) having negative polarity toner. The formed toner image is transferred to plain paper (not shown) using a transfer device (not shown).

When recording is not performed, the switching circuit 25 prevents positive ions from passing through the ion passage hole 3a.
To the contact b ₂ side to apply the negative bias voltage V _b ⁻ to the first control electrode 19 and the switching circuit 2
3 is switched to the contact a ₂ side to bring the first control electrode 19 and the second control electrode 20 to the same potential (earth potential) to make the electric field E ₂ zero and block the passage of positive ions.

In this way, the ion flow passing through the ion passage hole 3a is a low voltage (about 30 in this embodiment) applied between the first control electrode 19 and the second control electrode 20 of the control electrode 3.
V) can be controlled by the control voltage.

Further, the electric field due to the leakage of the AC voltage applied to the ion generator 2 from the AC power source 22 becomes larger as the control electrode 3 is brought closer to the ion generator 2, and if too close, the magnitude of the leakage electric field is that of air. Ionizing electric field (about 30 KV
/ Cm) or more, spark discharge is generated between the ion generator 2 and the control electrode 3. Therefore, the ion generator 2 and the control electrode 3 are separated by a predetermined distance (for example, about 100 to 500) so that spark discharge does not occur between the ion generator 2 and the control electrode 3.
μm) is provided.

In the above-described embodiment, the corners 6b and 6c of the head support 6 are C-cut to prevent the control electrode 3 from bending at the corners 6b and 6c at a right angle and breaking. In addition, as shown in FIGS. 5 and 6, for example, even if the corners 6b and 6c of the head support 6 are roundly cut or cut into L-shaped grooves, the control electrode 3 is disconnected as described above. Can be prevented.

Further, in the above-described embodiment, the drive circuit boards 5a and 5b and the first control electrode 19 located on the front surface side of the control electrode 3 are electrically connected through the bonding wire 28, but other than this. For example, as shown in FIGS. 7 and 8, the first control electrode 19 may be extended to above the drive circuit boards 5a and 5b and electrically connected via the bumps 35 and the anisotropic conductive film 36. .

Further, in the above-described embodiment, in order to prevent the second control electrode 20 between the front surface and the back surface from being short-circuited at the end portion of the control electrode 3, the tip of the second control electrode 20 located on the back surface side is prevented. Although the side is shortened and the adhesive 30 is filled in that portion, in addition to this, as shown in FIG. 9, for example, the tip side of the second control electrode 20 located on the back surface side is shortened and that portion is filled. The spacer 37 made of an insulator having the same thickness may be inserted and fixed with an adhesive.

[0062]

As described above in detail with reference to the embodiments, according to the present invention, the following effects can be obtained.

(1) By providing the drive means in the groove formed in the head support and electrically connecting it to the control electrode, the drive means does not protrude from the head support, so that the ion current recording head can be made thinner. In addition, since the connection surfaces are substantially the same, electrical connection can be easily performed.

(2) By cutting the corners of the end surface of the head support, it is possible to prevent the control electrode from being bent at a right angle at the corner of the end surface of the head support, and to prevent disconnection of the control electrode. Further, by cutting one electrode located on the back surface side of the end portion close to the driving means of the control electrode shorter than the other electrode located on the front surface side, the first and second electrodes are formed at the end portion of the control electrode. Can be prevented from being short-circuited, so that reliability can be improved.

(3) The wiring can be concentrated by connecting the lead lines from the ion generating means, the control electrode, and the driving means to the relay terminals provided on the head support, and wiring can be concentrated. It is possible to reduce the size of the ion flow recording head.

[Brief description of drawings]

FIG. 1 is a perspective view showing an ion flow recording head of an electrostatic recording apparatus according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line I-I of FIG.

FIG. 3 is a schematic configuration diagram showing an ion generator of the ion flow recording head shown in FIG.

FIG. 4 is an enlarged cross-sectional view showing an end portion of a control electrode.

FIG. 5 is an enlarged cross-sectional view showing a modified example of the corner portion of the head support end portion.

FIG. 6 is an enlarged cross-sectional view showing a modified example of a corner portion of the head support end portion.

FIG. 7 is an enlarged cross-sectional view showing a modified example of the connection portion between the drive circuit board and the control electrode.

FIG. 8 is an enlarged cross-sectional view showing a modified example of the connecting portion between the drive circuit board and the control electrode.

FIG. 9 is an enlarged cross-sectional view showing a modified example of the end portion of the control electrode.

FIG. 10 is a schematic configuration diagram showing an ion flow recording head of a conventional electrostatic recording device.

[Explanation of symbols]

 1 Recording Drum (Recording Medium) 2 Ion Generator 3 Control Electrode 3a Ion Passage Hole 4 Driver IC 5a, 5b Driving Circuit Board 6 Head Support 6a, Grooves 6b, 6c Corner 6d, 6e, 6f, 6g Groove 8 Dielectric Layer 12 Dielectric electrode 13 Insulator layer 14 Ion generation electrode 19 First control electrode 20 Second control electrode 22 AC power supply 24 First DC power supply 26 Second DC power supply 27 Third DC power supply 28 Bonding wire 31 Relay terminal 32 , 33, 34 Leader wire

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuo Hosaka 1 Komukai Toshiba-cho, Sachi-ku, Kawasaki-shi, Kanagawa Toshiba Research Institute

Claims (2)

[Claims] 1. At least two electrodes which are arranged along the main scanning direction on an end surface of a head support which is arranged so as to face a recording medium, and which are arranged in close proximity to each other with an insulating layer interposed therebetween. Ion generating means for generating ions by corona discharge when an alternating voltage is applied between the electrodes, and is arranged between the ion generating means and the recording medium and arranged along the main scanning direction. A control electrode having first and second control electrodes with an insulator having a plurality of ion passage holes for allowing generated ions to pass to the recording medium side; and the first and second control electrodes. One of the electrodes is set to a fixed potential, and a potential having a predetermined potential difference with respect to the other electrode is selectively applied to the other electrode to change the amount of ions generated by the ion generating means passing through the ion passage hole. Image signal An ion flow recording head integrally formed with a driving means for controlling the ion, and controlling the ions generated by the ion generating means by a control voltage applied between the first and second control electrodes. Then, the electrostatic latent image is formed by irradiating the recording medium to which a potential having a polarity opposite to that of the ions passing through the ion passing hole is applied through the ion passing hole to form an electrostatic latent image. In the electrostatic recording device for performing image recording by doing so, the corner portion of the end surface of the head support on the side facing the recording medium is cut, and the ion passage hole is positioned on the end surface of the head support. The control electrodes are fixed to both sides of the head support along the corners of the end face, and grooves are formed on both sides of the head support so that the control electrodes have substantially the same height as the control electrodes. The drive means is installed in the To electrically connect the control electrode and the driving means, and to electrically connect the control electrode and the ion generating means to at least one surface of the head support body to the driving means via a lead wire. An electrostatic recording device having a relay terminal of. 2. An end portion of one electrode of the first and second control electrodes located on the back surface side of the control electrode, which is close to the driving means, is cut shorter than the other electrode located on the front surface side. The electrostatic recording device according to claim 1, which is characterized in that.