JPH08238792A - Electrostatic recording device, intermediate recording body, and recording method using them - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an electrostatic recording device for recording stable images of high resolution. [Structure] The recording electrode section 4 includes a recording electrode layer 4a-1 and an insulating layer 1.
2 and the conductive member 16, the uppermost conductive member 16 is formed by extending the length m toward the downstream side (left side in the drawing) in the developer transport direction with respect to the recording electrode layer 4a-1. . An electric field Ej due to the pulse voltage V18 applied to the recording electrode 4a is formed with a spread indicated by an arrow J on the downstream side in the developer transport direction (FIG. 8A). On the other hand, the electric field Ek generated by the bias voltage having the opposite polarity to the pulse voltage V applied from the power source 19 to the insulating layer 12 is formed only on the downstream side of the recording electrode 4a in the developer transport direction due to the electric field shield effect of the recording electrode 4a ( The same figure (b)). As a result, the widened portion of the recording electric field (arrow J) and the reverse bias electric field (arrow K) are canceled out, a substantially vertical electric field Eh is formed from the recording electrode 4a, and a high-resolution electric field is transferred from the developing sleeve 9 to the recording film 3. A toner image is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrostatic recording apparatus for transferring a developer, which is conveyed along a predetermined path, to an intermediate recording medium according to recording information to form a recorded image.

[0002]

2. Description of the Related Art Conventionally, as one of electrostatic recording devices,
Multi stylus printers are known. This multi-stylus printer has a large number of needle electrodes (stylus).
Are arranged in the main scanning direction at evenly small intervals to form a recording head, and a voltage is selectively applied to each needle electrode according to a recording signal (image signal), and an electrostatic latent image is directly discharged on the paper. And a developer is adsorbed on the electrostatic latent image to record an image.

In this multi-stylus printer, when the distance between the tip of the needle electrode and the surface of the paper is wide, the discharge electric field is widened and the dots of the electrostatic latent image formed on the paper surface become large. Difficult to form. Further, when the paper has waviness or the like, there is a problem that the interval between the needle-shaped electrode and the paper cannot be kept constant and the formed image becomes unstable.

In order to solve such a problem, therefore, a plurality of recording electrodes arranged in parallel and a counter electrode arranged so as to face the recording electrodes are provided, and a stable intermediate recording having a stable shape is formed at the facing portions of these electrodes. The body is placed, the developer conveyed onto the counter electrode is transferred to the intermediate recording body according to the image signal, and an image is first formed by the developer on the intermediate recording body. An electrostatic recording apparatus has been proposed in which a recording image is obtained by transferring it to a recording sheet that is a recording body.

FIG. 9 is a front view of a recording portion of such an electrostatic recording device. In the figure, needle electrodes W1, W2, W3
., The toner T on the toner conveying member S is turned on in response to a recording signal to the intermediate recording medium F conveyed from the opposite side to the front side of the drawing.
The state in which the recording dots are adsorbed by and transferred to the side of the intermediate recording material F to form recording dots by the transfer toners T1 and T2 is shown.

[0006]

By the way, originally, the recording dots in this case should be formed by the transfer toner T1 shown in the figure in correspondence with the needle electrode W4 which is turned on. Due to the spread, the toner T2 is also transferred around the toner T1, and the recording dots become large as a whole and the resolution is lowered. In order to realize high resolution without such a situation, it is necessary to suppress the spread of the recording electric field inside the intermediate recording body, and therefore the intermediate recording body must be formed in a thin layer. However, when the intermediate recording material is formed in a thin layer in this way, there is a problem that the durability of the intermediate recording material is reduced and the practicality is lost.

Therefore, the front view of FIG. 10 (a) and the same view (b) of FIG.
As shown in a side sectional view of the recording electrodes W (W1, W2, W
3 ..) as the lowermost layer, an insulating layer R is formed on the lowermost layer, and a conductive member layer Db is formed on the entire surface of the insulating layer R. A bias voltage "-v" having a polarity opposite to the recording voltage V is applied to the conductive member layer. A method of applying Db has been proposed. Certainly, this method suppresses the spread of the electric field E1 between the recording electrodes W. Therefore, the resolution in the main scanning direction (middle direction of the intermediate recording medium) is improved. However, the spread of the electric field E2 in the sub-scanning direction (conveying direction of the intermediate recording medium) has not been solved, and therefore, the roughness of the resolution in the sub-scanning direction has not been improved yet, leaving a problem. It was a thing.

In view of the above situation, an object of the present invention is to provide an electrostatic recording device for recording stable images of high resolution.

[0009]

The structure of the electrostatic recording apparatus according to the present invention will be described below. An electrostatic recording apparatus according to a first aspect of the present invention is a plurality of recording electrodes arranged in parallel, a counter electrode arranged to face the recording electrodes with a recording body interposed therebetween, and a counter electrode on the counter electrodes. And a recording medium for selectively applying a recording voltage to the recording electrode so as to transfer the developer conveyed by the developer to the recording medium according to a recording signal. The present invention is applied to an electrostatic recording apparatus which is provided with a voltage applying unit and which transfers an image formed by a developer formed on the recording medium to a recording sheet by applying a recording voltage by the recording voltage applying unit to obtain a recorded image. .

In the electrostatic recording apparatus according to the first aspect of the invention, a recording electrode layer, an insulating layer, and a conductive member are sequentially laminated from the side facing the recording body, and the conductive member is developed more than the recording electrode layer. The recording electrode section is formed to extend downstream in the agent transport direction, and bias voltage applying means for applying a bias voltage having a polarity opposite to the recording voltage to the conductive member.

Next, the invention according to claim 2 (second invention)
The recording medium of No. 1 is composed of a plurality of layers in which the dielectric constant sequentially changes in ascending or descending order from the layer forming one surface to the layer forming the other surface.

According to the recording method of the invention of claim 3 (the third invention), a recording electrode portion having a plurality of recording electrodes juxtaposed with each other and a recording medium are arranged so as to face the recording electrode. Recording on the recording electrode in order to transfer the counter electrode, the developer conveying means for conveying the developer onto the counter electrode, and the developer conveyed by the developer conveying means to the recording medium according to a recording signal. A recording voltage applying unit for selectively applying a voltage, and by applying the recording voltage by the recording voltage applying unit, the image formed by the developer on the recording medium is transferred to a recording sheet to obtain a recorded image. An electrostatic recording device,
A recording medium composed of a plurality of layers whose permittivity sequentially changes in ascending or descending order from a layer forming one surface to a layer forming the other surface, and a surface having a lower dielectric constant of the recording body is used. Used as a recording surface. Further, for example, as described in claim 4, the recording electrode portion is formed by sequentially stacking a recording electrode layer, an insulating layer, and a conductive member from a side facing the recording body, and the conductive member is the recording electrode. A bias voltage applying unit that extends to the downstream side of the layer in the developer conveying direction and that applies a bias voltage having a polarity opposite to the recording voltage to the conductive member is further provided.

[0013]

In the electrostatic recording apparatus of the first invention, the bias voltage applying means applies a bias voltage having a reverse polarity to the recording voltage to the conductive member of the recording electrode. This conductive member cancels the electric field radiated from the electrode in the space corresponding to the portion formed on the downstream side in the developer transport direction. As a result, the recording electric field is narrowed down and the resolution is improved.

Next, in the recording medium of the second invention, the dielectric constant sequentially changes in ascending or descending order from the layer forming one surface of the plurality of layers to the layer forming the other surface. As a result, when the recording electric field is applied from the surface having the higher dielectric constant, the spread of the electric field formed on the surface having the lower dielectric constant is suppressed, and the recording electric field is narrowed down to improve the resolution.

The recording method of the third invention performs electrostatic recording using the recording medium of the second invention. As a result, a high-resolution recorded image can be obtained. In this case, the resolution is further improved by using the electrostatic recording device of the first invention.

[0016]

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a schematic cross-sectional view showing the overall configuration of the electrostatic recording device of the first embodiment. FIG. 2 is a partial perspective view thereof. In FIG. 1, the electrostatic recording device 1 is composed of a developing device 2, a recording film 3, a recording electrode portion 4, a transfer roll 5, and the like. The developing device 2 is composed of a developing sleeve 9 containing a magnet roll 8 and a developing container 10.

In the developing container 10, a magnetic toner d having a negative (-) triboelectrification polarity, for example, a one-component developer, is stored as a developer. The developing sleeve 9 is
The developing electrode 9 is configured as a counter electrode facing the recording electrode portion 4, and approximately half of the developing sleeve 9 is disposed inside the developing container 10.

The magnet roll 8 is constructed as a developer transport means, and has different magnetic poles (N
It is formed by alternately magnetizing the poles and the S poles. The magnet roll 8 is configured to be rotatable in a clockwise direction indicated by an arrow A in the drawing around a rotation shaft (not shown). By rotating the magnet roll 8 in the direction of the arrow A, the magnetic toner d can be conveyed along the peripheral surface of the developing sleeve 9 in the counterclockwise direction shown by the arrow B in the figure. A doctor blade 11 is formed on one end (right end in the drawing) of the developing container 10 to regulate the layer thickness of the magnetic toner d to an appropriate thickness.

A bias power source 7 is provided to the developing sleeve 9 described above.
Is connected, and a positive (+) low voltage having a polarity opposite to the triboelectric charging polarity of the magnetic toner d is applied to the developing sleeve 9 from the bias power source 7.

On the other hand, the recording film 3 is constructed as an intermediate recording body and has a volume resistivity in a predetermined range. This recording film 3 includes three support rolls 14a,
It is stretched by 14b and 14c, and is conveyed in the clockwise direction indicated by arrow C in the figure by these three support rolls 14a to 14c. Those three support rolls 14a-
14c are grounded respectively, thereby preventing the recording film 3 from being adversely affected by the electric charge accumulated in the supporting rolls 14a to 14c.

Of these, two support rolls 14b, 1
The central portion of the recording film 3 located between 4c is configured to face the developing sleeve 9 described above, and the facing position forms the recording portion Wr. In the recording portion Wr, the recording electrode portion 4 is in contact with the inner side (inner surface) of the recording film 3. Therefore, the recording electrode portion 4 and the developing sleeve 9 are arranged to face each other with the recording film 3 interposed therebetween in the recording portion Wr.

A step G is formed on the developing sleeve 9 at the position of the recording portion Wr. This step G
Is formed to widen the gap between the recording film 3 and the developing sleeve 9 so that the above-mentioned voltage applied to the developing sleeve 9 does not affect the magnetic toner d transferred to the recording film 3.

As shown in FIG. 2, a large number of recording electrodes 4a are arranged in the recording electrode section 4 in the width direction (the direction perpendicular to the paper surface of FIG. 1 (main scanning direction)). In the recording electrode 4a, a large number of recording electrode wires 4b made of a non-magnetic conductive material are arranged side by side on the electrode supporting member 12 made of a flexible insulating material at a predetermined fine pitch in the width direction of the electrode supporting member 12. The recording electrode wires 4b form the recording electrodes 4a at one end of the electrode supporting member 12. Electrode support member 12
A plurality of circuit elements 15 for driving the recording electrodes 4a are mounted on the other end of the. Each of these circuit elements 15 has a recording electrode wire 4 divided into an appropriate number.
b is connected, and a pulsed high voltage V (see FIG. 1) according to the print data is applied from the circuit element 15 to the recording electrode wire 4.
b, that is, it is selectively applied to the recording electrode 4a. The number of these recording electrodes 4a corresponds to the maximum number of pixels for one main scanning line of the paper.

The selective application of the pulse voltage in the recording portion Wr is, for example, when a certain 1-bit recording data is "1" (printing), a high positive voltage (+) is applied to the corresponding recording electrode 4a, for example. 200V is applied. At this time, a predetermined low voltage (for example, 50 V) is applied to the developing sleeve 9 from the bias power source 7, but since the voltage applied to the recording electrode 4a is high, the magnetic toner charged negatively (-). d is transferred to the side of the recording electrode 4a having a high electric potential. As a result, a toner image with the magnetic toner d is formed on the recording film 3.

The recording film 3 is moving in the direction of arrow C as described above, whereby the magnetic toner d (toner image) transferred onto the recording film 3 in the recording portion Wr is transferred to the transfer portion TA (see FIG. 1). Be transported to.

The transfer portion TA is formed in a state in which the support roll 14a and the transfer roll 5 are in pressure contact with each other via the recording film 3. As a result, the recording film 3 is held while the paper P is nipped and conveyed between the support roll 14a and the transfer roll 5.
The toner image transferred to is transferred to the paper P. The transfer process performed between the support roll 14a and the transfer roll 5 is
This is so-called roll transfer, and a bias power supply 13 for applying a predetermined bias voltage is connected to the transfer roll 5.

FIG. 3 is a diagram showing a state of the recording portion Wr when the magnetic toner d is transferred. As shown in the figure, the magnetic toner d on the developing sleeve 9 located in the recording portion Wr is attracted to the recording electrode 4a side by the pulse voltage applied to the recording electrode 4a, and at this time, the lower surface of the recording electrode 4a is attracted. Transferred to the moving recording film 3.

The recording film 3 is moving in the direction of arrow C at a constant speed, and at the beginning of applying a positive (+) high voltage to the recording electrode 4a, the length L of the recording electrode 4a on the recording film 3 is increased. Although the magnetic toner d is transferred to the same width as the (left and right widths in the figure), it becomes longer in the direction of arrow C as indicated by T'in the figure with the passage of time. Here, if the moving speed of the recording film 3 at this time is Vt and the application time of the pulse voltage V is Tv, the width L'of the magnetic toner d formed on the lower surface of the recording film 3 becomes L + Vt.multidot.Tv.

After that, when the voltage application to the recording electrode 4a is stopped, the recording electrode 4a becomes the ground potential. At this time, the developing sleeve 9 still has the bias power supply 7
Since a positive (+) low voltage is applied from the
The magnetic toner d transferred to the a side (recording film 3) returns to the peripheral surface of the developing sleeve 9. However, the width L of the recording electrode 4a
The magnetic toner d transferred to the lower surface of the recording film 3 that has moved in the direction of arrow C beyond the distance (note that this magnetic toner d is particularly indicated by d ') has a gap G formed in the developing sleeve 9 and thus has static electricity. It receives no force and remains transferred to the recording film 3.

FIG. 4 shows a state immediately after the application of the recording pulse voltage is stopped. As shown in FIG.
Recording film 3 that has moved in the direction of arrow C beyond the width L of a
Of the magnetic toner d (d ') transferred to the lower surface of the recording film 3, only the magnetic toner d'is held on the lower surface of the recording film 3 to form a black dot (1 dot printing), as indicated by T "in the figure.

On the other hand, for the recording electrode 4a to which the pulse voltage is not applied from the beginning ("0" (non-printing)), the magnetic toner d on the developing sleeve 9 at the corresponding position is the developing sleeve to which the low voltage is applied. It is still adsorbed on the 9 side,
There is no transfer to the recording film 3. This makes it possible to prevent so-called scumming.

When the magnetic toner d is transferred to the lower surface of the recording film 3, a structure for preventing the expansion of black dots in the main scanning direction is as described in FIG. 10 (a). In the present embodiment, the black dots in the sub-scanning direction, which have not been solved up to now, are prevented from spreading, and the black dots that are well cut, that is, do not have an excessive spread are held on the lower surface of the recording film 3 described above. Special arrangements are made in the structure of the recording electrode unit 4. The configuration of the recording electrode section 4 and its operating state will be described below.

5 (a), 5 (b) and 5 (c) are diagrams for explaining the structure of the recording electrode portion 4 in the present embodiment and its operating state. 1 to 4 described above, the configuration of the recording electrode portion 4 in the recording portion Wr is illustrated only as the recording electrode 4a, but the recording portion Wr of the recording electrode portion 4 in the present embodiment is shown.
5A, as shown in FIG. 5A, the recording electrode layer 4
a-1, an insulating layer (the electrode supporting member 12 shown in FIG. 2), and a conductive member 16. The recording electrode layer 4a-1, the insulating layer 12, and the conductive member 16 are sequentially laminated from the side facing (contacting) the recording film 3,
The uppermost conductive member 16 is formed by extending the length m toward the downstream side (left side in the drawing) of the recording electrode layer 4a-1 in the developer transport direction.

A bias voltage having a reverse polarity to the pulse voltage V18 applied to the recording electrode 4a (hereinafter referred to as a reverse bias voltage) is applied to the conductive member 16 from a power source 19. FIG. 6A is for explaining how the state of the electric field of the recording portion Wr is when the conductive member 16 does not function, that is, when the reverse bias voltage is not applied. , The switch is turned off to disconnect the power supply 19. As shown in (a) of the same figure, in the recording portion Wr, the recording pulse voltage V applied to the recording electrode 4a radiates downward in the direction indicated by the arrow H and in the downstream direction in the developer conveying direction indicated by the arrow J in the figure. A recording electric field Ej is formed. Therefore, in this case, as in the case shown in FIG. 9, in this case, black dots are enlarged on the downstream side in the developer conveying direction.

Next, FIG. 5B shows the state of the electric field of the recording portion Wr when the conductive member 16 functions.
The recording pulse voltage V applied to the recording electrode 4a is turned off,
The state where only the reverse bias voltage of the conductive member 16 is applied is shown. As shown in the figure, the reverse bias electric field Ek composed of the conductive member 16 having the reverse bias potential and the developing sleeve 9 (opposing electrode) having the ground potential is applied to the recording electrode 4
Due to the electric field shielding effect of a, it exists only on the downstream side of the recording electrode 4a in the developer conveying direction in the recording film 3,
In addition, it indicates that it is directed upward as indicated by arrow K in the figure.

Therefore, in the state where the reverse bias voltage 19 is always applied to the conductive member 16, when the recording pulse voltage V is applied to the recording electrode 4a, the downward recording electric field indicated by the arrow J in FIG. And the reverse bias electric field indicated by the arrow K in FIG. 5B overlap and cancel each other on the downstream side of the recording electrode 4a in the developer transport direction, and as shown in FIG. Recording electrode 4a which is not affected by
A substantially vertical electric field Eh is formed toward the developing sleeve 9. As described above, the reverse bias electric field largely cancels out the radiated part of the electric field of the recording electrode 4a in the recording film 3, in particular.

As a result, the attraction of the magnetic toner d transferred from the developing sleeve 9 is limited to the contact surface of the recording electrode 4a to which the recording pulse voltage is applied, and it does not spread to the surroundings, and the recording is very sharp. Dots that are faithful to the signal (image signal) are formed, so that a high-resolution image is obtained.

By the way, in the above embodiment, the electric field region penetrating the recording film 3 is shown by a single straight line, but in general, all the physical properties have a constant dielectric constant, and two dielectrics having different dielectric constants are present. At the body interface, the electric field produces a constant slope corresponding to the respective permittivity.

FIG. 6A shows the slope of the electric field at the interface between two dielectrics having different permittivities. The electric field Ej shown in FIG. 5A should actually be represented by two continuous two-dot chain lines Ej-1 and Ej-2 as shown in FIG. 6A.

FIG. 6 (b) shows a recording film 3a as a second embodiment of the present invention which utilizes the properties of such a dielectric material.
Is shown. As shown in the figure, the recording film 3a
Are four layers 3a-1, 3a-2, having different dielectric constants,
3a-3 and 3a-4. Due to the constitution of the recording film 3a, the electric field Em radiated from the recording electrode 4a does not spread largely to the downstream side in the developer conveying direction as shown in FIG. 4A, but is substantially vertical as shown in FIG. It is formed toward the developing sleeve 9 in a close state.

FIG. 7 shows the state of the electric field at the interface between air and water as an example showing the state of the electric field at the interface between two dielectrics having different permittivities ε1 and ε2. At the boundary surface 30 shown in the figure, the electric potential is continuous at the top and bottom,
Therefore, since the electric field component in the x direction along the boundary surface 30 is also continuous, if the angles formed by the electric field E1 of air and the electric field E2 of water with the normal line of the boundary surface are θ1 and θ2, then E1 · sin θ1 = E2 · sin θ2 holds.

Further, in the y direction perpendicular to the boundary surface 30, if there is no true charge on the boundary surface 30 according to Gauss's theorem, the following equation between the electric flux densities D1 and D2, D1.cos.theta.1 = D2.cos.theta.2. It holds.

Since D1 = ε1 · E1 D2 = ε2 · E2, tan θ1 / ε1 = tan θ2 / ε2 is derived from the above equation. Therefore, when the dielectric constant ε1 is larger than the dielectric constant ε2, the angle θ1 becomes larger than the angle θ2. Figure 6
The recording film 3a of (b) is constructed based on the above logic.

That is, in the enlarged view of FIG. 6 (b) shown in FIG. 8, each layer 3a-1, 3a-2, 3a-3 and 3a-
The dielectric constants ε 1, ε 2, ε 3 and ε 4 of 4 are ε 1> ε 2>
When configured as ε3> ε4, the angles θ1, θ2, θ3 and θ4 formed by the recording electric field formed when the recording voltage V is applied to the recording electrode 4a are θ1>θ2> θ.
3> θ4, and sequentially changes downward (vertical direction) for each boundary surface. Then, the electric field Em is applied to the developing sleeve 9 from the lower surface (fourth layer) of the recording film 3a, and the electric field Ej in the case of using the single recording film 3 can be narrowed in the vertical direction more greatly. Of course, the structure of the recording film 3a is not limited to four layers, and if the number of layers is further increased, better results can be obtained. This multi-layering can be easily formed by applying appropriate materials such as resins having different permittivities onto the base material by coating, for example, and solidifying it, and then peeling off the whole.

If this recording film 3a is used in the electrostatic recording apparatus of the previous embodiment, that is, if it is constructed like the conductive member 16 shown in FIG. A more narrowed electric field can be obtained, and a recorded image with high resolution can be realized.

Although the developer is simply the magnetic toner d in the above embodiment, it may be composed of carrier + magnetic toner. In this case, if the magnetic force of the magnet roll in the developing sleeve is set to 250 to 350 gauss. Sufficient recording density can be obtained, and good results can be obtained for prevention of background stain.

Further, it is desirable that the surface of the recording electrode is hard, because the recording electrode is not sharply cut when it is worn. To this end, by coating the surface of the recording electrode with a coating material of 6H or more, abrasion of the recording electrode can be suppressed, and thus a long life can be provided.

Although not particularly described in the embodiment, if a voltage having the same polarity (minus in this example) as that of the magnetic toner is applied without setting the non-recording electrode to the ground potential (OFF), the recording film. It is possible to easily prevent the toner from physically adhering to the surface of the toner, thereby preventing the background stain.

[0049]

As described above in detail, according to the first aspect of the invention, the conductive member laminated on the recording electrode via the insulating member is formed by extending it to the downstream side in the developer conveying direction, and the recording voltage and Since the reverse voltage is applied, the spread of the electric field to the downstream side in the developer transport direction due to the recording voltage can be suppressed, and thus a recorded image with high resolution can be formed. Also,
According to the second aspect of the invention, since the recording films are sequentially formed in the order of decreasing dielectric constant, the electric field passing through the recording film is sequentially narrowed at the boundary surface of each layer, so that the spread of the electric field can be suppressed. A recorded image with high resolution can be formed. Further, according to the third invention, since the electrostatic recording apparatus of the first invention is used for recording by using the multilayer film of the second invention, the recording electric field is further narrowed down and an electric field faithful to the recording electrode is formed. Therefore, it becomes possible to obtain an even higher resolution recorded image.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing the overall configuration of an electrostatic recording device according to a first embodiment.

FIG. 2 is a partial perspective view of the electrostatic recording apparatus according to the first embodiment.

FIG. 3 is a diagram showing a state of a recording unit when a magnetic toner is transferred.

FIG. 4 is a diagram showing a state immediately after application of a recording pulse voltage to a recording unit is stopped.

5A, 5B, and 5C are views for explaining the configuration of the recording electrode unit and its operating state in the embodiment.

FIG. 6A is a diagram showing an electric field gradient at a boundary surface between two dielectrics having different dielectric constants, and FIG. 6B is a second embodiment of the present invention utilizing the properties of the dielectrics having different dielectric constants. It is a figure which shows the multilayered recording film of.

FIG. 7 is a diagram showing an example of a state of an electric field at a boundary surface between two dielectrics having dielectric constants ε1 and ε2.

FIG. 8 is an enlarged view of FIG. 6 (b).

FIG. 9 is a front view of a recording unit of a conventional electrostatic recording device.

FIG. 10A is a front view of a recording unit of a conventional improved electrostatic recording apparatus, and FIG. 10B is a side sectional view thereof.

[Explanation of symbols]

 W1, W2, W3 ... Needle-shaped electrode F Intermediate recording medium S Toner conveying member T, T1, T2 Toner E Recording electric field R Insulating layer Db Conductive member layer V Recording voltage-v Bias voltage E1 Electric field between recording electrodes E2 Electric field in the sub-scanning direction 1 Electrostatic recording device 2 Developing device 3 Recording film 3a Multilayer recording film 4 Recording electrode part 4a Recording electrode 4b Recording electrode wire 4-1 Base member 5 Transfer roll 8 Magnet roll 9 Developing sleeve 10 Developing container 11 Doctor blade 12 Electrode supporting member (insulating member) 13 Bias power supply 14a, 14b, 14c Support roll 15 Circuit element 16 Conductive member 18 (V) Recording pulse voltage 19 Reverse bias power supply d, d'Magnetic toner Wr Recording portion G Step TA Transfer part P Paper T ', T "Black dot

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroyuki Takeyama 3-2-1 Sakaemachi, Hamura-shi, Tokyo Casio Computer Co., Ltd. Hamura Technical Center (72) Inventor Kazushi Amaya 3-2-1 Sakaemachi, Hamura-shi, Tokyo No. Casio Computer Co., Ltd. in Hamura Technical Center (72) Inventor Hideki Takahashi 3-2-1 Sakaemachi, Hamura City, Tokyo Casio Computer Co., Ltd. in Hamura Technical Center (72) Inventor Shigeru Shimizu 3-2 Sakaemachi, Hamura City, Tokyo No. 1 Casio Computer Co., Ltd. in Hamura Technical Center

Claims (4)

[Claims] 1. A plurality of recording electrodes arranged in parallel, and a counter electrode arranged to face the recording electrodes with an intermediate recording body interposed therebetween.
A developer transport means for transporting the developer onto the counter electrode, and a recording voltage for the recording electrode is selected so that the developer transported by the developer transport means is transferred to the intermediate recording body according to a recording signal. And a recording voltage applying unit that applies a recording voltage to the recording medium to transfer a recording voltage applied by the recording voltage applying unit onto a recording paper to obtain a recorded image. In the recording device, a recording electrode layer, an insulating layer, and a conductive member are sequentially laminated from the side facing the intermediate recording body, and the conductive member is extended downstream of the recording electrode layer in the developer transport direction. An electrostatic recording apparatus comprising: a recording electrode portion formed by the above; and a bias voltage applying unit that applies a bias voltage having a reverse polarity to the recording voltage to the conductive member. 2. An intermediate recording medium comprising a plurality of layers whose permittivity sequentially changes in an ascending order or a descending order from a layer forming one surface to a layer forming the other surface. 3. A recording electrode portion having a plurality of recording electrodes arranged in parallel, a counter electrode arranged to face the recording electrode with an intermediate recording body interposed therebetween, and a developer carrying a developer on the counter electrode. And a recording voltage applying unit that selectively applies a recording voltage to the recording electrode in order to transfer the developer conveyed by the developer conveying unit to the intermediate recording body according to a recording signal, An electrostatic recording device for transferring an image formed by the developer formed on the intermediate recording medium to a recording sheet to obtain a recorded image by applying a recording voltage by the recording voltage applying means, and a layer forming one surface And an intermediate recording body composed of a plurality of layers whose permittivity sequentially changes in ascending or descending order to a layer forming the other surface, and the surface of the intermediate recording body having a lower dielectric constant is used as a recording surface. Recording method characterized by. 4. The recording electrode portion is formed by sequentially stacking a recording electrode layer, an insulating layer, and a conductive member from the side facing the intermediate recording body, and developing the conductive member more than the recording electrode layer. 4. The recording method according to claim 3, further comprising a bias voltage applying unit that extends to the downstream side in the agent transport direction and that applies a bias voltage having a reverse polarity to the recording voltage to the conductive member.