JPS59197060A - Image recorder - Google Patents

Abstract

PURPOSE:To improve the recording density and make a recorded picture clear by forming a recording electrode, which is arranged to face a recording medium, into a projecting shape in the recording position of an insulating substrate and arranging electrodes, which are connected to a signal electrode, in opposite directions alternately along a substrate face. CONSTITUTION:A toner T applied onto the recording medium is formed as bristles of the toner T at the tip of a recording electrode 4 by the magnetic field of the recording electrode 4 which is generated by a voltage from a signal electrode 9. Electrodes for voltage application are led out alternatell to the toner supply side and the carrying-out side to recording electrodes 4 consisting of electrodes 16 formed on an insulating substrate 15 by etching. Therefore, wiring is possible with a half density. Consequently, the width of electrodes for voltage application can be made wide to prevent the short-circuit between electrodes, and the precision at the time when electric parts are mounted on a toner carrying member is improved, and recording electrodes are arranged with a high density to make a recorded image clear.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is disclosed herein for depositing monocomponent conductive magnetic particles (hereinafter referred to as toner) onto a recording medium in response to an electrical signal. An outline of this conventional device will be explained with reference to FIG. In FIG. 1, reference numeral 1 denotes a toner conveying member, which is a non-magnetic cylinder made of stainless steel, aluminum, etc. provided in a toner storage container 2. As shown in FIG. 6 is a magnet, and the toner conveying member 1
The magnet is movably (rotatably) provided inside the magnet, and magnetic poles of different polarity are alternately magnetized on the circumferential surface at approximately equal intervals on the circumference. 4 is a recording electrode, which is located in a part on the toner conveying member 1;
A large number of them are arranged in the axial direction of the member, each independently and electrically insulated, and the grip is made of Nokuichi Malloy, nickel, iron, or the like.

Reference numeral 5 denotes a recording medium, which is transported in the direction of the arrow while facing the electrode member 4, and has an insulating layer 5b formed on the surface of a conductive substrate 5a. It is also possible to use paper. Reference numeral 6 denotes a back ml electrode, which uses a conductive roller placed in contact with the conductive substrate 5a of the recording medium 5 and opposed to the electrode member 4.

A conventional image recording apparatus to which the present invention is applied has the above configuration, in which the magnet 3 is placed in the direction of arrow A, and the recording medium 5
are respectively driven in the direction of arrow B by hand-wound drive means (not shown). The toner T in the container 2 is attracted by the magnetic force, held on the toner conveying member 1 in a layered manner, and conveyed in a direction C opposite to the direction of rotation of the magnet 6. The transported toner T1 is regulated into a uniform thin layer by a doctor blade 7 provided at the outlet of the container, and when it reaches the recording position 8 where the recording electrode 4 and the back electrode 6 face each other, the signal power source 9
A voltage corresponding to the image to be recorded is applied to the recording electrode 4, and as a result, charges are injected into the recording medium 5 through the toner T, and due to the force of this charge, which is stronger than the magnetic force, the toner T is transferred to the insulating layer 5b of the recording medium 5. and an image is formed according to the above principle.

The image is fixed by a fixing means (not shown) such as heat or pressure.

FIG. 2 shows another embodiment of the JIII image forming apparatus to which the present invention is applied, the details of which are described in Japanese Patent Publication No. 55-127578. In the figure, the same numbers as in FIG. 1 indicate members having the same functions, and 10 is a toner applying member, which is made of a non-magnetic cylinder and has a rotating body inside which is rotated by a drive means (not shown) K. It has a magnet 11. When the rotating magnet 11 rotates in the direction of the arrow, the toner T is taken out of the toner container 12 in a thin layer, moves on the application member 1o in the direction of the arrow E, and is carried out to the recording medium 5. At this time, when a voltage is applied between the recording medium 5 and the toner application member 10 from the power source 16, the toner T is applied onto the recording medium 5 in a thin layer. This can be considered to be the same phenomenon as applying a voltage to all of the recording electrodes in the device shown in FIG. 1 above.

When the toner T coated on the recording medium in this manner reaches the layer-like recording electrode 4, the toner T is affected by the magnetic field generated in the recording electrode, and a spike of toner T is formed at the tip of the electrode 4. That is, the magnet 4a attached to the electrode 4
generates a magnetic field at the tip of the

At the position of the recording electrode 4, when the electrode 4 is at ground bias, the electric charge of the toner escapes to the electrode 4 through the ears of the toner T, so there is an electrostatic (one-sticking force) between the recording medium 5 and the toner 1. become unable to work.

However, when a signal voltage is applied to the recording electrode 4 from the signal power supply 9, the toner T which forms ears as explained in FIG.
An electric charge is generated, and an electrostatic force acts to cause the toner T to adhere to the recording medium 5. The voltage applied to the recording electrode 4 is set to have the same polarity as the voltage that the toner T had.

Next, after this charge is obtained in an image pattern, the toner T is removed by a toner removal device using, for example, a magnetic field or air suction. If it is removed without disturbing the state, a recorded image will appear on the recording medium 5.

In this case, the five electrodes connected to the recording electrode and the signal power source used in the conventional recording device were formed on one side of the insulating substrate with respect to the recording electrode. The pole pattern width becomes extremely small (for example, about 40 μm for 16 pels), and there is a problem that it becomes discontinuous and short circuits easily occur. Furthermore, since the width of the pattern is small, it is difficult to connect it to a signal power source.

An object of the present invention is to solve the problems of the recording apparatus used in the above system. A further object of the present invention is to provide a recording device that can improve recording density and sharpen recorded images.

The image recording device of the present invention that achieves the above object includes: a developer transport member that transports four-electromagnetic particles; a recording electrode that is arranged independently and electrically insulated on the developer transport member; a recording medium that is transported opposite the recording electrode; 1. , l: In a device that applies a voltage to a recording electrode to form an image using four-electromagnetic particles on a recording medium, the recording electrode is formed of a magnetic material, and the insulating substrate is formed into a convex shape at the recording position. The electrodes connecting the recording electrodes and the signal power source are arranged alternately in opposite directions along the surface of the insulating substrate.

To use the above recording electrode more effectively, a recording electrode made of a magnetic material is provided on the edge of an insulating substrate, and this end is bent nine times to form a recording electrode, or the insulating substrate is bent to form a convex shape. A recording electrode made of a magnetic material is provided on the top of the electrode.

As a new recording electrode configuration that can solve the problems of the prior art described above, there is a proposal for a recording electrode as explained in the following FIGS. 6A and 3B.

FIG. 6A is a plan view of a recording electrode, and such an electrode is used by being adhered to the circumferential surface of the toner conveying member 10 shown in FIG. The structure of this recording electrode is to form an electrode 16 on an insulating film 15 by etching, and then to drill a fine hole in glass or the like so that the hole is located above the electrode 16 corresponding to the position where the recording electrode is to be formed. The mask members thus obtained are superimposed, a magnetic material is attached by a method such as plating, and the mask member is then removed to form the signal electrode 4 (also shown in Figure B).
6A is a sectional view taken along line F--F in FIG. 6A.

The advantage of the recording electrode having such a configuration is that the electrodes for applying the li voltage are drawn out alternately on the toner carry-in side and the toner carry-out side to the signal 'Iff pole 4, so that the electrodes can be drawn out only from one side. The reason is that wiring can be done at half the density of the previous case. As a result, the line width of each electrode for voltage application can be widened, preventing discontinuity of electrode turns and short circuits between electrodes, and at the same time, when electrical components are mounted on the toner transport member. It is possible to improve the accuracy of the recording electrodes, and the density of the recording electrodes can be increased.

As is clear from FIG. 6B, in the recording electrode obtained by this method, the signal electrode portion cannot be configured so high above the toner conveying member as compared to other portions. The reason for this is that a large amount of magnetic material cannot be attached by plating. For this reason, when this electrode is directly attached to the toner transport member, the height of the recording electrode is not sufficient, making it difficult to concentrate the magnetic field on the recording electrode. The contact portion spreads in both the toner carrying-in and toner-carrying directions of the signal electrode 4 portion. Therefore, the resolution of the recorded artist in the moving direction of the recording medium may be distorted from above (or may cause phenomena such as fogging in the background).

An example of a recording electrode that takes advantage of the advantages of the recording electrode shown in FIG. 6 and solves the above problems will be described below in detail with reference to the drawings.

FIG. 4 shows an embodiment in which the tip of the insulating substrate is also used as a recording electrode. As an example of forming the signal electrode in the figure, 15
On both sides of the insulating film, electrodes 16 in the shape of comb teeth are formed of iron, copper, nickel, etc. by etching, following the signal electrode moss 9 joints. Thereafter, a magnetic material such as iron is attached to the vicinity of the tip of the electrode 16 by plating to form a signal electrode. In order to actually form a magnetic material only on the electrode 16, it is possible to form a fine opening in the glass as in the above example and attach the magnetic material onto the electrode 16 only through this opening. It is OK to plate the entire top with magnetic material.
. By extending the electrode 16 to the tip side, such a magnetic material can be applied not only to the flat surface of the film 15 but also to the tip side.
Alternatively, it can be formed only on the tip side by a plating method, Tl (casting method, etc.).

As shown in Figure 5, the signal electrode Q1 in Figure 4 formed as described above is bent at a fixed position from its tip side to the front and back for the purpose of smoothing the movement of toner and insulating the electrodes from each other. An insulating member 1B made of resin is provided as shown in the figure, and is fixed on the toner conveying member 1. Alternatively, if the electrode 16 is made of a magnetic material and supported in a flat manner, it can also be used as the No. 1 electrode of the apparatus shown in FIG.

In the present embodiment shown in FIG. 4, as in the case of FIG.
Since the wiring for the signal '1E source 9 can be done with half the accuracy of the conventional method, the effect of the electrodes shown in FIG. 6 can be inherited. At the same time, unlike the case shown in Fig. 4 where magnetic material is stuck in dots, the amount of magnetic material forming the signal electrode can be increased, making it possible to sufficiently concentrate the magnetic field at the recording position. becomes. Also, depending on the bending position of the insulating substrate, the signal '[L
Since the pole portion can be sufficiently spaced from the surface of the toner transport section, it is possible to eliminate the drawbacks of the electrode shown in FIG. 3 above.

FIGS. 6 and 7 show an embodiment in which an insulating substrate is bent and the top side thereof is used as a signal power source. Specific examples and preparation examples thereof will be described below with reference to each drawing.

Figure 6A is a plan view of the electrode part, and Figure 6B is the figure 6 human G.
- Shows a cross section along line G. As shown in the figure, on the insulating film 15,
The electrode 16 following the signal power source is formed of copper by etching, and the magnetic material 1 is further attached to the tip of the electrode 16 in the same manner as above as shown in the figure.
7 is plated to form a signal electrode. Thereafter, in order to improve the accuracy when bending the insulating substrate 15, a recess is formed at the bending position as shown in FIG. 5B. The side of the electrode through which toner passes is coated with an insulating material 18 to prevent leakage due to toner.

FIG. 7 is a perspective view of the electrode bent and fixed on the toner conveying member, and FIG. 7B is a cross-sectional view of the signal electrode portion of FIG. 7. The insulating material 18 provided on each of the electrodes is removed by polishing or the like only on the top of the magnetic material that will become the signal electrode. If the space 22 is made of a magnetic material in order to maintain the bent shape, it becomes possible to apply an even stronger magnetic field to the toner passing through the signal electrode.

The electrode in FIG. 7 is formed to be attached to the toner conveying member as shown in FIG. 1, but if the four parts 19 and 21 in FIG. It can also be used as a signal electrode in the device shown in FIG. In this case, the electrode 16 may be made of a magnetic material, the bent electrode may be supported by a magnetic plate, or both may be used in combination. Such a configuration can also be applied to the electrode shown in FIG. 6, and the electrode shown in FIG. 3 is bent 9 around the position of the signal electrode.

With the above configuration, the signal electrode and the signal power source can be configured to have a wide junction electrode, so that short circuits between the electrodes can be prevented. Furthermore, by using the electrode configurations shown in FIGS. 4 and 6, the amount of magnetic material near the tip of the signal electrode can be increased, making it possible to make sufficient spikes of toner at the recording position, thereby improving the recording of the recorded image. We were able to increase the density. Furthermore, according to the electrode configurations shown in FIGS. 4 and 6, it is possible to maintain a sufficient distance between the surface of the toner conveying member and the recording position, so that sharp spikes of toner can be formed, which also improves the recording density. It contributes to the effectiveness.

[Brief explanation of the drawing]

1 and 2 are sectional views of essential parts of a recording device to which the present invention can be applied, FIG. 6 is a plan view showing an embodiment of the recording electrode of the present invention, and FIG. -F line sectional view, perspective view of another embodiment of the fourth upper electrode, Figure 5 is a perspective view of a completed example electrode using the electrode in Figure 4, figure 6 is another embodiment of the electrode. The plan view of the example, Figure 6B is a sectional view taken along line G-G of Figure 6, and Figure 7
The figure shows a perspective view of a completed example of the electrode using the electrode shown in FIG. 6, and FIG. 7B shows a sectional view taken in FIG. 7. In the figure, 1 is a toner conveying member, 6 is a rotating magnet, 4 is a recording electrode, 15 is an insulating substrate, 16 is an electrode connecting a signal electrode and a signal power source, and T is a toner.

Claims (3)

[Claims] (1) A developer transport member that transports conductive magnetic particles, a recording electrode that is independent and electrically insulated and placed on the developer transport unit side, and a recording that is transported facing the recording electrode. In the apparatus, the recording electrode is formed into a convex shape at the recording position of the insulating substrate, and the recording electrode is formed in a convex shape at the recording position of the insulating substrate. An image recording device characterized in that electrodes connecting the electrodes and a signal power source are formed on the surface of an insulating substrate and alternately arranged in opposite directions. (2) The image recording apparatus according to claim 1, wherein the recording electrode is formed by bending an end of an insulating substrate at a recording position to use the end as the recording electrode. (3) The recording electrode is made into a convex shape by bending the insulating substrate,
The electrode facing the top should be used as the recording electrode.