JPS63283961A - Color recorder - Google Patents

Abstract

PURPOSE:To simplify a structure of a color recorder by recording a color image of a good quality at a high speed, by a method wherein each of two pieces of second electrodes which are separated is selected to a ternary state according to an image signal having different color information with a control circuit. CONSTITUTION:A recording head of which an ion current control electrode is composed of two pieces of control electrodes 4a, 4b having been separated is used, and a drive electrode 2 and control electrodes 4a, 4b are laminated on a substrate 1 via an insulating material 3. Then, potentials thereof are switched with a control circuit 10 according to image signals having different color information, and an latent image of a mutual different polarity is formed on a latent image carrier 9. That is, the control electrodes 4a, 4b, as clearly shown from a structure given in the figure, can select three values of both positive electric potentials, electric potentials of mutual different polarity, and both negative electric potentials by switching and driving charge and a negative charge to be emitted to the latent image carrier 9 can be controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a color recording device, and more specifically, a color recording device for recording a color image according to two-color image signals, which is applicable to facsimiles, printers, etc. The present invention relates to a color electrostatic recording device.

[Conventional technology]

In recent years, the use of color image output devices has progressed, and the demand for color hard copies has increased. Under these circumstances, many proposals have already been made as color image forming apparatuses, including an electrophotographic full-color type as disclosed in JP-A-59-72870, and many others. . In these methods, a latent image (charging, exposure), development, transfer, and cleaning process is performed for each color, and a transfer drum is placed opposite the photoreceptor.
Color images are recorded by transferring each color.

Furthermore, in recent years, a method has been proposed in which a digital charger is used to form positive and negative charge patterns on a carrier, and the patterns are visualized with two types of toners having different colors depending on the polarity. As an example, FIG. 8 shows a schematic diagram of a digital charger disclosed in JP-A-61-103172, and FIG.
The figure shows a time chart of the voltage applied to each electrode of this digital charger.
is a solid dielectric, 21 is a digital charger, 22 to 24 are power supplies, 25 and 26 are multiplexers, and E%F.

G indicates an electrode, and this method uses a latent image forming head formed by laminating three layers of electrodes, that is, a screen electrode E, a control electrode F, and a drive electrode G. In order to release both positive and negative charges, the polarities of the screen electrode E and control electrode F are switched as shown in Figure 9, and this switching enables two-color image formation in one recording process. I have to.

[Problem that the invention seeks to solve]

However, in the former electrophotographic method, since it is necessary to perform transfer for each color, the device itself becomes large and
Another problem is that the recording speed decreases.

Further, in the latter method using a digital charger, the structure of the latent image forming means is complicated and the driving method thereof is also complicated, so that there is a problem that the printing speed is reduced. In other words, by exchanging the polarities of the screen electrode E and the control electrode F, both positive and negative charges are released, so if you try to form a latent image by matrix drive, the polarity of the screen electrode E and the control electrode F will be reversed. Charge release and negative charge release occur with a certain delay. This is because the screen charger iE is common to all dots. Therefore, it is possible to divide the screen electrode E, but
This poses a problem in that control becomes even more complex. Therefore, the recording speed is at least twice as fast as when recording only with positive or negative signals, and a disadvantage is that a decrease in speed cannot be avoided.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the drawbacks of the color recording apparatus described above, to provide a color recording apparatus that can record high-quality color images at high speed, and has a simple configuration.

[Means for solving problems]

For this purpose, the color recording device of the present invention includes a latent image carrier;
A color recording device comprising an electrostatic latent image forming means in which a first electrode and a second electrode are laminated via an insulating material, and forms latent images of mutually different polarities in accordance with image signals having different color information. The second electrode is made up of two separated electrodes, and each of the second electrodes made of the two separated electrodes is connected to the image signal having color information so that both of the second electrodes are correct. The device is characterized in that it is driven by switching between three states of potential, mutually different polarity potentials, and both negative potentials.

[Effect]

In the color recording apparatus of the present invention, the control circuit 10 switches and drives each of the second electrodes consisting of two separated electrodes 4a and 4b in order to control the generation of positive and negative charges. Depending on the image signal having color information, it is possible to select one of three states: positive potential for both, potentials with different polarities, and negative potential for both. Therefore, these three
It is possible to form latent images with different polarities depending on the value.

〔Example〕

Examples will be described below with reference to the drawings.

FIG. 1 is a schematic configuration diagram showing one embodiment of the recording head used in the color recording apparatus of the present invention, FIG. 2 is a plan view of one embodiment of the recording head used in the embodiment of the present invention, and FIG. 3 4 is a timing diagram showing one embodiment of the printing drive method of the present invention, and FIG. 4 is a diagram for explaining the principle of emitting charges in both positive and negative polarities. 2-4 is a drive electrode, 3 is an insulating plate, 4a, 4b, 4al to 4an, 4bl
~4bn is a mm electrode, 7 is an AC power supply, 9 is a latent image carrier,
lO indicates a control circuit.

The color recording device according to the present invention has two control electrodes 4a separated from each other by an ion flow mm electrode, as shown in FIG. 1, for example.
, 4b is used. In this recording head, a drive electrode 2 and a control electrode 4as4b are laminated on a substrate 1 with a wA edge material 3 interposed therebetween as shown in the figure. Then, the control circuit 10 responds to the image signals having different color information.
By switching the potential, latent images of mutually different polarities are formed on the latent image carrier 9. That is, I1
As is clear from the illustrated configuration, the control electrodes 4a and 4b can be switched and driven by the control circuit 10 to select three values: positive potential for both, potentials with different polarities, and negative potential for both. The positive charge and the negative charge emitted to the image carrier 9 can be switched and controlled. FIG. 2 shows a plan view of this recording head.

In FIG. 2, the recording head has linear drive electrodes 2-1 to 2-4 arranged parallel to each other on an insulating substrate 1, an insulating plate 3 on top of which, and further drive electrodes 2-1 to 2-4. ~2
-4 and the ion flow control electrode 4al perpendicular to the matrix shape.
This is a latent image forming head consisting of all of ~4an and 4bl~4bn. Here, the ion flow control electrodes 4al to 4an, 4
bl~4bn are a pair of divided control electrodes 4al,
4b1 makes up 1 pro, ivy.

An example of a method for driving the recording head used in the color recording apparatus of the present invention will be explained with reference to FIG. In Figure 3, v
8-1 to -4 are high frequency voltages for discharge driving that are applied to the drive electrodes 2-1 to 2-4 in a time-division manner. This voltage is, for example, 1 MHz.

It is set at about 2 to 3 kV. Now, regarding the ion flow control electrodes 4al and 4bl in FIG. 2, attention is paid to the discharge region S intersecting with the drive electrode 2-1, and the potential on the latent image carrier 9 opposing the discharge region S is set to Vs. Therefore, the control circuit 10
Accordingly, the ionic modulus m1 is set to the poles 4al, 4bl (7) potential V
4ml s Switch to + to V4, and first, see Figure 3 (a
), when both the potentials Veml % and V4kl are made positive, for example, +300V, positive charges are released and the potential 3 on the latent image carrier 9 is charged to approximately 200 to 300V.

However, as shown in the timing of FIG. 3(b), the potential v4,
1 is positive, for example, +300V, and potential Vab+ is negative, for example, -300V, no charge is released from the discharge region S, and the potential Vs on the latent image carrier 9 remains at Ov. Also, as shown in the timing of FIG. 3(c), the potential V4@l,
Vah, both negative, for example v4□-V. r=-30
When the voltage is set to 0V, negative charges are released and the potential Vs on the latent image carrier 9 is negatively charged to -200 to 300V. By configuring such a drive circuit and driving each discharge jl region in a matrix manner, both positive and negative charges can be generated simultaneously on the l drive electrode. Although not shown, ion flow wi control electrodes 4al, 4b1, 4nl, 4nf
All parts not involved in electrical discharge are filled with insulating material to prevent abnormal electrical discharge.

FIG. 4 shows the control of the ion flow in more detail using the movement of charges. By controlling the ion flow explained in FIG. 3, while applying AC voltage to the drive electrode 2 for a certain time width, both the ion flow control 3'N electrodes 4a and 4b are set to a positive potential in order to release positive charges. Then, creeping discharge occurs between the drive electrode 2 and the control electrodes 4a, 4b, as shown in FIG. 4(a).
As shown in , the ions generated at this time are biased toward the "+" side. As a result, a positive charge is placed on the latent image carrier 9 due to the electric field (arrow) generated between the control electrodes 4a, 4b and the latent image carrier 9, and the latent image carrier 9 is positively charged. Furthermore, when potentials with different polarities are applied to the ion flow control electrodes 4a and 4b in order to turn them into an off state in which no charge is released, creeping discharge occurs due to the force between the drive electrode 2 and the control electrodes 4a and 4b. Figure 4 (
As shown in b), the "+" and "-" ions generated by the electric field between the control electrodes 4a and 4b are each attracted to the opposite pole side, and no charge is released. Moreover, in order to release negative charges, when both the ion flow control electrodes 4a and 4b are set to a negative potential, the ion flow control electrodes 4a and 4b are biased toward the "-" side as shown in FIG. 4 (c7), contrary to FIG. 4(a). Ions are generated, and a negative charge is placed on the latent image carrier 9 due to the electric field (arrow) between the ion flow control electrodes 4a, 4b and the latent image carrier 9, resulting in negative charging.In this case, the ion flow The distance between the control electrodes 4a and 4b is preferably narrower than the distance between the ion flow control electrodes 4a and 4b and the latent image carrier 9 in order to control the charge wi.

FIG. 5 is a schematic diagram showing one embodiment of a color recording device according to the present invention, FIG. 6 is a diagram for explaining the principle of two-color development,
FIG. 7 is a diagram showing a configuration example of a control circuit for color recording. In FIG. 0, 9 is a latent image carrier, 11 is a recording head, 12 is a first developer, 13 is a second developer, and 14 is a pressure roll, 15
1 is a cleaner, and 16 is a static eliminating scorotron.

FIG. 5 shows a color recording apparatus incorporating the recording head described in FIGS. 1 to 4. In FIG. 5, a first developing device 12 and a second developing device 13 are developing devices containing toners of different colors and charging polarities, and the latent images of both positive and negative polarities formed by the recording head 11 are used as developing devices. For example, if the first developing device 12 contains red, positively charged toner, and the second developing device 13 contains black, negatively charged toner, then
As shown in FIG. 6, red toner is developed on the negative latent image, and black toner is developed on the positive latent image. A color image is recorded by pressing and transferring the developed two-color toner onto paper using a pressure roll 14 shown in FIG. After that, the latent image carrier 9 is cleaned by a cleaner 15,
The charge is removed by the charge removal scorotron 16, and the next recording cycle begins. FIG. 7 shows an example of the configuration of the control circuit.

In the control circuit shown in FIG. 7, the image information of two colors is black,
It is on the red image memory. A data assembler rearranges this image information for matrix driving, converts it into serial data, and manually sends each of the black and red information to the high-voltage switching circuit of the ion flow control n-electrodes 4a and 4b. do. Here, for example, in black data,
If the black printed part is "1", the non-printed part is "0", and the red data is "O" and the non-printed part is "1", then rl, Black when IJ, r
A switching circuit may be constructed so that red is printed when O and OJ are printed, and no printing is printed when rO and IJ, and these operations are performed in synchronization with the signal from the timing pulse circuit.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, the release of positive charges and the release of negative charges can be controlled by dividing the ion flow control electrode and switching their potentials, so that the configuration is simple. The printer is compact and can record color images at higher speeds than conventional printers.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing one embodiment of the recording head used in the color recording apparatus of the present invention, 2rM is a plan view of one embodiment of the recording head used in the embodiment of the present invention, and FIG. A timing diagram showing an embodiment of the print driving method of the present invention,
FIG. 4 is a diagram for explaining the principle of positive and negative charge emission, FIG. 5 is a schematic diagram showing an embodiment of a color recording device according to the present invention, and FIG. 6 is a diagram for explaining the principle of two-color development. 7 is a diagram showing an example of the configuration of a control circuit for color recording, FIG. 8 is a schematic configuration diagram of a conventional digital charger, and FIG. 9 is a diagram showing an example of the configuration of a control circuit for color recording. 5 is a timing chart of voltages to be applied. 1... Substrate, 2.2-1 to 2-4... Drive electrode, 3
...Insulating plate, 4 a s 4 b s 4 a 1~
4 a n % 4 b 1-4bn...control electrode,
7... AC power supply, 9... Latent image carrier, 10... Control circuit. Applicant: Fuji Xerox Co., Ltd. Representative Patent Attorney
Ryukichi Abe (2 others) Figure 2 Figure 3 Figure 4 ((L) (b) (f; 7) ππ7] 7

Claims (1)

[Claims] (1) Comprising a latent image carrier and an electrostatic latent image forming means in which a first electrode and a second electrode are laminated via an insulating material, the electrostatic latent image forming means has an electrostatic latent image forming means in which a first electrode and a second electrode are laminated with each other through an insulating material. A color recording device that forms a latent image, wherein the second electrode is composed of two separated electrodes, and each of the second electrodes composed of the two separated electrodes has color information. A color recording device characterized in that it is driven in response to an image signal by switching between three states: positive potential for both, potentials of different polarities, and negative potential for both.