JPS60260348A - Picture recorder - Google Patents

Abstract

PURPOSE:To decrease the fog density of a picture and to make the miniaturization of a magnet possible, by a method wherein in a toner type picture recorder, the measure giving vibration to a recording medium is provided when the picture is recorded. CONSTITUTION:When vibration is given to the recording medium 1 near a recording position 10 with a vibrator 13, toner T becomes of a state easy to be freed. At that time, when a signal voltage is applied to a recording electrode 7 from a letter signal generator 9, the charges of polarities reversed to each other are generated at the toner T and a dielectric layer 1a by putting a dielectric 1b between them and the toner T is adhered to the recording medium 1 with the electrostatic attraction force thereof. Even through vibration is given, the toner T is not freed at this position. On the other hand, at the position where no signal voltage is applied, free toner T is attracted with the magnetic force by a magnet 8 and only the toner T attributed to picture recording remains on the recording medium 1. The fog or the like disappear and a clear picture is obtained without the dimness around the recorded image. Further, the magnetic force of the magnet 8 can be lowered.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an image recording apparatus, particularly to a direct-component conductive magnetic developer (hereinafter abbreviated as toner) in response to an image electrical signal.
The present invention relates to an improvement in an image recording device that records an image by attaching a substance to a recording medium.

[Background of the invention]

A conventional device of this kind is described in detail in U.S. Pat. A very general outline of this conventional device will be explained with reference to FIG.

In Fig. 2, reference numeral 1 denotes a recording medium, and in this example, it has a structure in which an alumite-treated dielectric layer 1b is provided on an aluminum cylinder 1a. Available for use. Reference numeral 2 denotes a hollow housing for containing the conductive magnetic toner T, inside of which there is a hollow cylindrical toner application roller 4 made of a non-magnetic conductor, and inside it there is a rolled magnet 3. is accommodated.

7 is a recording electrode, usually made of magnetic material, e.g. iron, /41-
It is made of malloy, nickel, etc., and is created by arranging a large number of thin wires facing the recording medium 1 and parallel to the axial direction, or by a technique such as an etching technique. Although not shown, they are electrically insulated from each other and fixed together using an insulating adhesive. The recording electrode 7 is sandwiched between magnets 8 having the same polarity and facing each other. Further, each of the recording electrodes 7 is independently connected to a character signal generator 9.

The recording medium 1 rotates in the direction of arrow A. When the toner application roller 4 rotates in the direction of arrow B, the toner T in the hook 2 is attracted to the toner application roller 4 by the action of the magnet 3, and the doctor blade 5 spreads the toner T uniformly.
is formed on the application roller 4. When this toner T is carried by the rotation of the application roller 4 and comes into contact with the recording medium 1, it is attached to the recording medium 1 by being electrostatically charged by applying a DC voltage from the bias power source 6.

By the time the toner T reaches the recording position 10 due to the rotation of the recording medium 1 in the direction of arrow A, the electrostatic charge is almost lost and the toner adheres to the recording medium mainly due to molecular force;
When the recording position 10 is reached, the magnetic field emitted from the magnet 8 affects the recording electrode 7, forming a spike of toner T spanning between the recording medium 1 and the recording electrode 7, and the remaining static charge passes through this spike. At this time, the toner loses almost all its adhesion to the recording medium 1 as the toner escapes. However, when the character signal generator 9 applies a recording signal voltage corresponding to the multi-image pattern at this time, the toner T formed between the recording electrode 7 and the recording medium 1
Charges of opposite polarity appear on the conductive layer 1& and the tip of the toner T ear with the dielectric layer 1b in between. This charge provides an electrostatic force sufficient to cause the toner T to adhere to the recording medium 1. On the other hand, in the area where the recording signal voltage is not applied (non-image area), there is no charge injection as described above, so no electric force acts between the recording medium 1 and the toner 1.
The toner T in that area is accumulated in the vicinity of the magnet 8 along the recording electrode 7 by the magnetic field generated from the magnet 8.

As a result, a visualized toner image is formed on the recording medium 1 after passing through the recording position 10 facing the recording electrode 7 . Although this toner image is not shown, typically corona discharge,
It may be transferred to paper by pressure transfer and fixed, or if electrostatic recording paper or the like is used as the recording medium 1, it may be fixed as is.

3A and 3B are enlarged views of the vicinity of recording position 10 in order to explain the operation of the apparatus shown in FIG. 2 in more detail.

FIG. 3A shows a case where a recording signal voltage is applied, and FIG. 3B shows a case where a recording signal voltage is not applied. Broken line 1
0 indicates that the magnetic field generated by the magnet 8 passes near the recording electrode 7. When a signal voltage is applied from the character signal generator 9 between the recording medium 1 and the recording electrode 7 as shown in FIG. 3A, the toner T adheres to the recording medium 1 against the magnetic force of the magnetic field 10 as described above. However, as shown in FIG. 3B, unless a signal voltage is applied from the character signal generator 9 to the recording electrode 7, no adhesive force is exerted between the recording medium 1 and the toner 1, so the magnetic field 10 generated by the magnet 8 by force,
Toner T moves in the direction of arrow C. As a result, a visualized toner image appears on the recording medium 1.

However, in the above-mentioned apparatus, depending on the strength of the magnetic force of the magnet 8, there is a possibility that the density of the recorded image may be lowered or capriulation may occur. According to the inventor's experiments, it was not possible to obtain a good quality image with uniform density without capri unless the magnetic flux density at the tip of the recording electrode 7 was set to 1000/1300 Gauss. Further, depending on the surface properties of the recording medium 1, if unnecessary toner T remains attached to the recording medium 1, the creased recorded image becomes unsightly. In order to prevent these, special public disclosure was made in 1973.
As detailed in 5-127578, it is conceivable to provide a means to remove capri by blowing a capri-removal magnet onto a windshield immediately after recording, but if such a means is provided, It is undeniable that the apparatus with reduced image density after recording becomes larger. Furthermore, if the surface properties of the recording medium 1 are poor, the toner T will penetrate into the recesses and it will be difficult to remove this toner, which will seriously damage the image and make it impractical.

[Purpose of the invention]

An object of the present invention is to eliminate the above-mentioned conventional drawbacks in this type of image recording apparatus, and to enable recording of uniform density and good image quality without capri.

[Summary of the invention]

A feature of the present invention is that the above-mentioned type of image recording apparatus is provided with means for applying vibration to the recording medium during image recording.

[Embodiments of the invention]

Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 shows an embodiment of the present invention. In the figure, parts corresponding to those in FIGS. 2, 3, and 3 are designated by the same reference numerals.

The recording medium 1 is shown in the form of a flat plate in FIG. 1, and a Mylar film is used as the substrate IC. ITO is deposited on the upper surface of the IC and a conductive layer 1a is formed thereon. It is coated with titanium to a thickness of 2μ.

Toner T can be used as long as it has a magnetic property of less than about 1010 Ω-m and contains magnetism, but in this example, a 5 x 100-pixel image was created by adding some carbon to imaging powder VQC355 sold by 3M Company. / I used the one adjusted so that it was.

The recording electrode 7 is made of pure iron with a diameter of 20 μm.
3,360 pieces were arranged in parallel across the width, and they were each electrically insulated and fixed with an insulating material 11 made of Cemedine High Super (trade name). The fixed recording electrode group 7 faces the recording medium 1 so as to be substantially perpendicular to the recording medium 1 with a gap of 75±25 μm. magnet 8
The same poles are arranged to face each other so that the recording electrode group 7 is sandwiched therebetween and the magnetic flux density at the recording position of the recording electrode 7 is high. If the magnetic flux density of the magnet 8 alone is sufficiently high, the magnet may be provided only on one side.

Reference numeral 12 denotes an ultrasonic power source for driving the vibrator 13. A coil 14 is wound around a vibrator 13 connected to an ultrasonic power source 12, and a back plate 15 is attached to the tip of the vibrator 13.
It is placed on the opposite side. When the vibrator 13 takes an image, ultrasonic waves are transmitted to the back plate 15, causing the recording medium 1 to vibrate. Note that when the recording medium 1 uses a metal drum or the like as shown in FIG. 1, the vibration of the vibrator 13 may be applied directly to the recording medium 1 without the back plate 15. In this case, it is necessary to prevent standing wave vibration from occurring, but since there are various well-known methods for this purpose, they will not be described in detail here.

In this example, a ferrite magnetostrictive vibrator made by TDK with a frequency of π(4) and an i-wave number of 281 kHzO was used as the vibrator 13, but other electrical or mechanical vibrators such as an electrostrictive vibrator, a bimorph vibrator, a voice coil, etc. Means are also available.

With the above configuration, when vibration is applied to the recording medium 1 near the recording position 10 by the vibrator 13, the toner T on the recording medium 1 near the recording position 10 is likely to be released. At this time, when a signal voltage is applied from the character signal generator 9 to the recording electrode 7,
As explained in FIG. 2, charges of opposite polarity are generated in the toner T and the conductive layer 1a facing the toner T with the dielectric 1b in between, and due to the electrostatic attraction, the toner is transferred to the recording medium 1. T is attached. Therefore, even if vibrations are applied to this portion, the toner T will not be released from the recording medium 1. However, on the other hand, in areas where no signal voltage is applied,
The free toner T is attracted to the magnet 8 by the magnetic force generated by the magnet 8. As a result, only the toner T that contributes to image recording remains on the recording medium 1, so there is no fogging, etc.
Furthermore, the area around the recording section does not become distorted, making it possible to obtain a clear image. Furthermore, since the toner T on the recording medium 1 is easily separated, even if the magnetic force generated from the magnet 8 is weak, it is possible to reliably strip off toner unnecessary for image formation from the recording medium 1. Conventionally, the magnetic flux density at the tip of the recording electrode 7 was required to be 1000-1300 Gauss, but in the embodiment of the present invention, the magnetic flux density was 500-1 Gauss.
000 was able to be reduced to about 1000 yen.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to prevent image fog density in this type of image recording device and to make the magnet smaller by simply vibrating the recording medium near the recording electrode. At the same time, the image density can be increased and clear images can be obtained without arranging a complicated capri removal device or the like.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is a side sectional view of a conventional example of an image recording apparatus to which the present invention relates, and FIGS. 3A and 3B are partially detailed views of FIG. 1. 1: Recording medium, 2: Toner hole, nozzle, 3: Roll magnet, 4 Ni sleeve, 6: DC bias power supply, 7: Recording electrode, 8: Magnet, 9
: Character signal generator, 10: Recording position, , 11: Insulator, 12: Ultrasonic power source, 13: Vibrator, 15: Back plate. Figure 1 Figure 2

Claims (1)

[Claims] A recording electrode array, a recording medium that is closely opposed to the recording electrode array and moves it relatively, means for supplying conductive magnetic toner between the recording electrode array and the recording medium, and the recording electrode array and the recording medium. In an image recording apparatus, the image recording apparatus includes means for generating a magnetic field between the recording medium and a selected electrode of the recording electrode array, and means for applying an image signal voltage between the selected electrode of the recording electrode array and the recording medium. An image recording device characterized by being provided with means for applying vibration.