JPS5979769A - Electrostatic recording head - Google Patents

Abstract

PURPOSE:To make the titled recording head adaptable to a hard recording body based on a metal such as a metal drum without using a charge corotron, by forming the main electrode and control electrode of an electrostatic recording head on a plastic film. CONSTITUTION:An electrostatic recording head 10 is contituted from a base film 1 comprising polyimide resin, an integrated circuit 2 for a drive circuit fixed on said film, lead electrodes 4 provided with recording electrodes 3 at the leading end parts thereof connected to said circuit 2 at predetermined intervals, control electrodes 6 arranged in parallel to the recording electrodes 3 and connected to said circuit 2 and respective insulating layers 5, 7. Because the leading end of this recording head 10 is attached to a recording body 11 so as to be contacted therewith by proper elastic force and the base film 1 is contacted with said recording body 1 while functioning the same as a leaf spring, said head is not damaged even if the hard recording body is used. In addition, because the control electrode is provided, it is unnecessary to perform charging prior to recording and a charge corotron is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrostatic recording head in which a main electrode and a control electrode are formed on a plastic film so that it can be used even with a hard recording medium.

A conventional electrostatic recording head uses, for example, a multi-needle electrode in which a large number (e.g., 8 lines) of insulating coated wires are arranged in a row and the periphery is hardened with epoxy resin.

In the above configuration, the tip of the recording head is brought close to the moving insulating recording paper surface, a voltage is distributed to each of the wires by a distribution circuit according to the input information, and an electrostatic charge corresponding to the information is generated on the recording paper. A visible record can be obtained by applying this and developing it with fine powder.

However, in conventional static top recording heads, the wire is a hard stylus hardened with resin, so the recording medium is limited to soft materials such as paper and film.

The present invention has been made in view of the above.
To provide an electrostatic recording head in which a main electrode and a control electrode are formed on a plastic film in order to be able to apply the charge corotron to a hard recording medium based on JJ'6 Drano etc. without changing the charge corotron once. It is.

Hereinafter, the electrostatic recording head according to the present invention will be reviewed in detail.

2131 and 2 show an embodiment of the present invention, and 7
A base film 1 is made of a polyimide film having a size of /r, and an integrated circuit (IC) for the 71J9 circuit is fixed on the base film 1 and applies a voltage according to input information to each stylus. )2, i1'ie is connected to the integrated circuit 2 at a predetermined interval, and its jy[
A lead electrode 4 having a lead length fixed to the base film 1 by photoetching or plating and arranged in a line at the tip;
an insulating layer 5 covering the entire area of the lead electrode 4 except for the recording electrode 3; a control electrode 6 disposed parallel to the row of recording '1L poles 3 and connected to the integrated circuit 2; and the control electrode 6. It is composed of an insulating layer 7 that covers the.

The base film is made of polyimide, for example, and
The recording electrode 3 has a thickness of 16 dots/m.
m, 40μ771φ, 3μ! It is formed to about the same thickness. The lead electrodes 4, the recording electrodes 3, and the control electrodes 6 are all formed by depositing nickel on the entire surface of the base film 1, coating it with a resist, exposing it to a photomask, and then removing the resist and etching the nickel.
The width is 0 μm and the thickness is about 3 μn1. The size of the control electrode 6 is about 5 mm 1i', and the length is slightly longer than the width of the recording paper.

In the above 41'Q formation, the tip of the electrostatic recording head 10 (portion of recording electrodes 3 and control electrodes 6) which is in the unfolded state as shown in FIG. 1 is attached to the recording body 11 as shown in FIG. It is attached so that it makes contact with a moderate 9jlt force. Because of this structure, the base film 1 has a function similar to a plate, and since the stylus and the recording medium come into contact flexibly, the stylus and the recording medium will not be damaged. In addition, control 1 (by providing an electrode, there is no need to charge the recording medium before recording, and there is no need to provide a charge corotron. Furthermore, the control electrode is divided and scanned (11f configuration). Then, the 'Ii'J configuration of the drive circuit for the stylus can be simplified to 1:'il.

FIG. 4 shows an example of a recording device using the electrostatic recording head of the present invention, in which a charge is applied to a recording medium mounted on the surface of a drum using the electrostatic recording head of the present invention. It is. The recording machine, tl'y, is made of cylindrical aluminum with a resistance layer (20 μm of carbon + binder coat) on its surface.
A drum 12 is provided with a recording body 11 formed by providing a conductive layer (polyester resin of 5 μm) on the surface thereof, a motor 13 that drives the drum 12, and a drum 12 with a recording body 11 formed by providing a dielectric layer (polyester resin of 5 μm) on the surface thereof, a motor 13 that drives the drum 12, and a two-component film on the surface of the recording body 110. a developing device 14 that attaches powder (toner) according to the surface charge; a transfer corotron 15 that attaches (transfers) the toner attached to the surface of the recording medium 11 to the surface of the recording medium 11; It is composed of a cleaner 17 that removes toner adhering to the surface of the subsequent drum, and a corotron 18 that does not remove the charge on the recording medium 11 that has been cleaned by the cough cleaner 17.Each of the above-mentioned devices And the electrostatic recording head 10 has an open side 1 part 20 or a drive 1ijO controlled by the control part.
It is driven by circuit 30.

The control unit 20 receives recording signals, console key outputs, and outputs from various sensors and switches as input information, converts them into predetermined digital signals, and outputs them to an input interface 22 and a recording machine (according to a predetermined sequence). A ROM 23 stores a program for moving the stylus and distributing voltage to the stylus according to a recording signal to the electrostatic recording pad 10, and executes necessary calculations, judgments, and control commands according to the program in the ROM 23. A CPU 24 for outputting, a RAM 25 for temporarily storing calculation results and input information by the CPU 24, and a CPU 24 for outputting data.
An output interface 26 and an output interface 11''q are configured to output the control commands 24 to the outside.

one! 1: Distributes voltage to each stylus (Nj2 f, j! electrode 4) of the electrostatic recording head 10 according to input information (has 4 functions, the configuration of which is shown in FIG. The image signal DS from Book π111 Part 20 is transferred to a shift register 41, a latch circuit 42 that latches the contents of the register 41, and a latch circuit 42 that latches the contents of the register 41. a gate circuit 43 that outputs a signal according to an enable signal ES (outputted from the control unit 20), and high voltage drive transistors 441 to 4 provided in one-to-one correspondence to each of the recording electrodes 3.
It is composed of 4n and Yoshi. When creating integrated circuit 2,
High voltage drive transistors 441 to 44n are manufactured using a VMOS process, and other devices are manufactured using a CMOS process. Specifically, one chip is 64 bits 'li'7.
It is mounted using a ceramic chip carrier method.

In the above 11 configurations, the drum 12 whose load has been made zero by the erase corotron 18 (surface 'Fg) is rotated while being controlled at a constant circumferential speed by the control section 20, and the position of the electrostatic recording head 10 is adjusted. Electrostatic recording is performed at P3=. The electrostatic recording head 10 applies a direct current heavy pressure (for example, +40
0V) is applied, and the recorder voltage sr is applied to pole 3.
One line of voltage is simultaneously distributed to each stylus using the image signal DS and the enable signal ES output from s 20 (for example, a pulse of 300 V and 100 μs is applied to the recording medium 11). make a statue Next, toner is applied by the developing device 14, and a visible image is applied to the sheet.Furthermore, the transfer corotron 16 is installed. A visible image is transferred by applying a high voltage (for example, -51 cV).The transferred plain paper 15 is sent out to the outside of the recording device, and the drum 12 is cleaned by a cleaner 17 and erased using an AC corotron. Recording body 1 with Corotron 18
Erase the static charge on 1.

The inventors obtained 44/l! shown in FIG. I checked the stylus and 'i8 recorder for wear during construction, but the B4
No wear was observed even after recording 10,000 sheets of paper1, confirming the practicality of the present invention.

In addition, in the embodiment of the present invention, an example was shown in which the control electrode was provided in the recording head, but a charge corotron is provided in the recording apparatus. Kamoai ni υ is unnecessary.

According to the electrostatic recording head of the present invention as explained above,
Main electrode and control 'til1 on plastic film
It can be used for hard recording media such as gold-plated i-pace drums.

Furthermore, since a control electrode is provided, a recording device can be constructed without using a charge corotron.

4. Detailed Description of the Invention FIG. 1 is a plan view showing one embodiment of the invention. Figure 2 is the first
FIG. 3 is a sectional view taken along line A-A of the embodiment shown in the figure. FIG. 3 is a sectional view of the embodiment of the present invention in use.

FIG. 4 is a diagram showing an example of a He recording device using the static 11I recording head of the present invention. FIG. 5 is a circuit diagram showing details of the integrated circuit according to the present invention.

1... Base film, 5, 7... Insulating layer, 2
... Integrated circuit for driver 7i and i11 circuits, 3... Recording electrode, 4... Lead electrode, 61... Control electrode.

Patent applicant: Nobuyuki Matsubara, agent for Xerox Co., Ltd., patent attorney

Claims (1)

[Claims] In a recording head that has a regular electrode array and performs static recording in the horizontal direction of image scanning in rows by row by applying a voltage according to recorded information to each pole, 4. a plastic film having elasticity, a Lee pole fixed at a predetermined interval on the plastic film and having one end connected to a drive circuit; Recording electrode provided at the other end of the pole: A single pole or a number of one pole arranged corresponding to the recording electrode.
An electrostatic recording head characterized in that it is provided with an electrode 11' and an insulator 9') covering the lead electrode.