JPS58178378A - Image recorder - Google Patents

Abstract

PURPOSE:To obtain a recorded image of high accuracy free from the unevenness in the image by providing a control means in the position where the aperture centerline thereof maintains roughly the same distance from an electric charged particle generating source. CONSTITUTION:When a high voltage is applied from a high voltage power source 10 to a corona wire 9, ions are formed from the wire 9 and part thereof arrive at the aperture 4 of a control means. When the voltage is applied from a signal source 11 on a signal electrode 1 in this stage, an electric field is generated between the electrodes 1 and 3 and the ions are acted with force in the direction of the electrode 1, by which the ions are passed through the aperture 4 or the passage thereof is blocked by the same. A DC power source 12 applies a DC voltage on the base electrode 3 and a back electrode 5, and the sticking of the ions on the electrode 1 is prevented by the electric field generated by said voltage. The ions are further accelerated so as to stick on the surface of a recording member 6. The apertures 4 in this case are arranged to draw an arc around the wire 9 to make the degrees of the electric charged particles arriving at the member 6 equal. The sharp image having no unevenness is thus obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device that uses an electric field generated in an aperture to control the infrared radiation of charged particles such as ions and charged toner through the aperture, thereby obtaining a recorded image. be.

Conventionally, this type of image recording technology is disclosed in U.S. Patent No. 111.
It is proposed in iF No. 3689935. In this method, two electrodes are provided with an insulating layer interposed between them, and a control means in which holes are formed in a row is used.The control means controls the passage of charged particles, and the electrodes are placed on the side opposite to the charged particle supply source. The objective is to obtain an image by charged particles that have passed onto a recording member, which is an image receiving member provided.

However, in this conventional method, there are other methods such as arranging the holes in a staggered manner to increase the density per line, but in the method, charged particles generated from a charged particle source are used as a control means. Holes that are far away from each other have the disadvantage of being difficult to reach.

For this reason, when the charged particle generation source is a corona wire, the apparatus becomes complicated.

The object of the present invention is to eliminate the above-mentioned conventional drawbacks, and at the same time
This makes it possible to downsize the device and improve the accuracy of recorded images.

Hereinafter, the present invention will be explained according to one embodiment and its explanation factors.

FIG. 1 is a sectional view showing the principle of the recording apparatus of the present invention.

In the figure, a signal electrode is a first electrode that applies a signal voltage in the form of an image, and 6 is a base electrode that is a second electrode. Both electrodes are kept electrically insulated by an insulating member 2. . Signal electrode 1 constituting this control means. Base electrode 3
The insulating member 2 is provided with an opening 4. The recording member 6 is made of a dielectric or a sheet of ordinary paper coated with a dielectric, and is moved at a constant speed in the direction of the arrow in close contact with the back electrode 5.

On the side opposite to the recording member of the modulation device, there is a charged particle generating means 7 using a corona discharger that generates ions, which are charged particles, to the recording position. Regarding this charged particle generating means 7, there is a corona wire 9 for causing corona discharge inside a metal shield 8 having an opening in a part thereof, and this wire 9 is connected to a high voltage power source 10, and the shield plate 8 is grounded. It is kept at a potential.

In the above configuration, when a high voltage is applied to the corona wire 9 from the high voltage power supply 10, ions are generated from the corona wire 9, and the generated -S reaches the opening 4 of the control means. At this time, when a voltage is applied to the signal electrode 1 from the signal power supply 11, an electric field is generated between the electrodes 1 and 6, and a force is exerted on the ions in the direction of the signal electrode 1, so that the ions pass through the aperture 4 or are blocked.

Note that 12 in the figure is a DC power supply that applies a DC voltage to the base electrode 6 and back electrode 5, and the electric field caused by this applied voltage prevents the ions from adhering to the signal electrode 1 (they are further accelerated by the DC electric field and are not recorded). It adheres to the surface of the member 60.

Since the ions deposited on the recording member 6 as described above are electrostatic latent, they are visualized using magnetic brush development or liquid development in order to be visualized. In an actual device, the electrodes 1.3 having the apertures 4 are provided over the entire width of the recording member 6, and images are formed by applying control signals to each electrically independent signal electrode. .

By the way, in a recording device based on the above principle, there is a limit to the recording density, so K to increase this density is to arrange the apertures 4 in two staggered rows, or to arrange them in multiple rows as shown in Fig. 2. The shape must be such that the apertures are arranged across the entire width of the recording member. The problem with this method is that the distance from a single charged particle source to each aperture 4 is different, so that the charged particles passing through the control means are strong (
, a phenomenon occurs in which it is difficult for the charged particles to reach the recording member.As a result, undesirable results such as image unevenness are obtained.

To solve this problem, attempts have been made to solve the problem as described above (by moving the charged particle source away from each hole, or by arranging a large number of charged particle sources corresponding to each hole row). However, with such a solution, it is inevitable that the device configuration becomes complicated and the device becomes larger. Note that Fig. 2 1 is a plan view of the control means, and Fig.
Fi Fig. 2 1-111! A cross-sectional view is shown.

FIG. 3 is a sectional view of the device showing a new configuration that solves the drawbacks of the conventional example. In the diagram, the same structure or function as in the wSi diagram is numbered by company regulation number.

As shown in FIG. 3, each aperture of the control means is arranged in a circular arc H with the charged particle (corona wire 9) at its center. It is possible to always keep the distance to the source 9 constant.Therefore, image irregularities caused by differences in the degree of arrival of charged particles to the recording member can be eliminated by simply controlling the control means as in the present invention. By providing a curved surface, charged particles can be uniformly supplied to the recording member 6, thereby making it possible to prevent their occurrence.

FIG. 4 In another modification of the present invention, the electric field generated in the aperture 4 of the control means shown in FIG. 2 controls the passage of powdered toner as charged particles. As in the above embodiment, the control means used here has a plurality of rows of control holes over the entire width of the recording member, as described in FIG.

In addition, in the drawings, as in the case of FIG. 6, members having the same configuration or function as those in FIG. 1 are given the same numbers.

The major difference between the charged particle generation source [7] and the case shown in FIG. 1, which generates charged particles, is that charged magnetic powder toner is used instead of using ions as charged particles. Toner, which is a charged particle, is supplied to the apertures 4 using a hollow cylindrical toner conveying member 14 made of a non-magnetic conductor. A fixed magnet 15 is located inside this conveying member 14, and these are inserted into the hopper 16. Fixed. A blade 17 is disposed within the hopper 16, and applies a certain amount of toner 16 in a thin layer onto the toner conveying member 14 by magnetic force with the fixed magnet 15. On the other hand, an 18IIi AC power source is connected to generate an AC electric field between the base electrode 6 and the toner transport member 14.

In the above configuration, the base electrode 3 and the toner transport member 14
In the meantime, the toner 131i on the toner transporting member 14 moves between the base electrode 6 and the toner transporting member 14 by applying an AC voltage from the AC power supply 18 or an AC voltage biased by DC. At this time, when a voltage is applied from the signal power supply 11 between the signal electrode 1 and the base electrode 6, the toner 16 on the transporting member 14, which is moving, enters the opening 4, and first the signal electrode 1 Due to the action of the electric field generated by the electric field applied between the back electrode 5 and the base electrode 3,
It adheres to the recording member 6.

As can be seen from FIG. 4, by arranging the aperture 4 of the control means at approximately the same distance as the surface of the charged particle source, it is possible to keep the supply amount of toner 16 constant as in the case of FIG. 6. did it.

As explained above, when a plurality of apertures 4 of the control means are provided in the moving direction of the recording member, the control means is configured in an arc shape, When a counter electrode is provided along this arc-shaped control means, if the recording member is pressed against the recessed portion of the counter electrode, the back electrode and the recording member 6 can be brought into close contact with each other.

In order to convey the recording member well along the concave surface of the counter electrode, the recording member may be conveyed by providing an opening in the counter electrode and applying suction air to the counter electrode.

Furthermore, regarding the image receiving member, in addition to using a recording member as in the above embodiment, when the charged particles are ions, they are developed and fixed, and in the case of toner, these latent particles are used after being simply fixed. The image or unfixed image may be transferred to another transfer material for use. Of course, as a control member, the electric current provided on both sides of the insulating member 2

[Brief explanation of drawings]

Plan view of possible control means, FIG. 2 or 1-1 in FIG.
6 and 4 are cross-sectional views of a device showing an embodiment of the present invention. In the figure, 4 shows the opening of the control means, 5 shows the back electrode, 6 shows the recording member which is an image receiving member, and 7 shows the charged particle generating means. Tafu Canon Co., Ltd.' - Agent Gi Marushima -: 4

Claims (1)

[Claims] 1) A charged particle generator disposed in the width direction of the recording member, a control means having at least two or more rows of control apertures in the width direction of the image receiving member for controlling the passage of charged particles, and a control aperture provided from the charged particles in the width direction of the image receiving member. an image-receiving member that receives and receives the controlled charged particles passing therethrough, and wherein the center line of the aperture of the control means is maintained at approximately the same distance from the charged particle source.