JPS5896571A - Magnetic ink recorder - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic ink recording device,
By arranging opposing electrodes in two rows in a staggered manner, it is possible to provide a magnetic ink recording device that is easy to handle and can record uniform images with less noise.

FIG. 1 shows a cross-sectional view of a recording section of a conventional magnetic ink recording device. In this figure, a needle electrode 6 placed on a stylus base 19 is magnetized by a bump magnet 16.

On the other hand, the magnetic ink 17 sent into the ink chamber 18 is fed through the tip of the needle electrode 6 through the slit portion formed by the bump magnet 16 and the supply slit magnet 16. The counter electrode 1 identified on the support base 2 is connected to the needle electrode 5 via the recording paper 11.
is facing. A bias voltage is always applied between the needle electrode 6 and the counter electrode 1, and when a positive high voltage pulse signal is applied to the needle electrode 6 and a negative high voltage pulse signal is applied to the counter electrode 1, the recording paper 11 and magnetic ink 1 at the tip of the needle electrode 6
7 increases, and the magnetic ink 1 at the tip of the needle electrode 6 increases.
The magnetic ink 17 flies onto the recording paper 11 due to the Coulomb force acting on the recording paper 11 .

FIG. 2 shows a schematic configuration diagram of a conventional counter electrode.

In this figure, counter electrodes 1 are etched on an insulating base 3 at equal pitches (for example, 21m pitch, distance between electrodes 2.
00 μm) and is connected to the high voltage pulse generation circuit through connector 4VC.

The opposing type 'Ja!' shown in FIG. , 1 and the needle electrode 6 in a conventional matrix configuration diagram is shown in FIG. Needle electrode 5
is 126 if the recording density is equal pitch (s)'y)/-
micrometer pitch) and are electrically connected every two 9z. The pitch of the opposing electrodes 1 corresponds to 16 needle electrodes, and the first opposing electrode 1a is opposed to the needle electrodes 1 to 4 and 1, and the second opposing electrode 1b is opposed to the needle electrodes 1 to 4. The needle electrodes numbered to number 20 are facing each other, and the third facing electrode I
CE has needle electrodes numbered 21 to 37 facing each other. Hereinafter, one counter electrode faces the 16 needle electrodes 6 in this way. When recording an image using this matrix configuration, first, the needle electrode control circuit 8 sends a needle electrode high voltage pulse generation circuit 6alC control signal,
A selection signal is sent to every other needle electrode 6. At this time, if there is an image on a dot corresponding to the 1st, 33rd, 66th, etc. needle electrode 6, the needle electrode 5 corresponds to the image signal from the opposing electrode IK and the opposing electrode control circuit 9. A high voltage pulse signal generated by the counter electrode high voltage pulse generation circuit 7 is applied according to the control signal. On the other hand, a DC bias is applied between the needle electrode 6 and the counter electrode by a bias power supply 10, and when a high voltage pulse is applied to the partner of the needle electrode 6 and the counter electrode 1, the magnetic ink 17 at the tip of the needle electrode 6
fly and form an image. In this way, the needle electrode high-voltage pulse generating circuits 6 are sequentially selected from 6a to 6z, and images are sequentially formed using the counter electrode 1 facing each needle electrode 6. However, the counter electrode 1a and the counter electrode 1b
The gap between the opposing electrodes 1 cannot be made very small due to the withstand voltage between the electrodes (200 μm in the case of FIG. 2). Also, due to problems such as the accuracy of alignment between the needle electrode 6 and the counter electrode 1, when recording with the needle electrodes 6 facing each other near the gap between the counter electrodes 1, it is necessary to input the same image signal to both the left and right counter electrodes. Records must be made. For example, when recording needle electrode discharge from the needle electrode 5b in FIG. 3, a high voltage pulse corresponding to the image signal is applied to both the counter electrode 1a and the counter electrode 1b.

In this case, the entire distribution of surface potential appearing on the recording paper in contact with the counter electrodes 1a and 1b is shown in FIG.

The graph shown in the upper part of this figure shows the potential distribution in the main scanning direction on the recording paper 11, and the broken lines indicate the counter electrode 1a,
This is the case where a voltage is applied to the opposing electrode 1b alone, and the solid line is the case where a voltage is applied to both opposing electrodes. As shown in this graph, when IK voltages are applied to two opposing electrodes, the potential near the gap between the opposing electrodes 1 becomes high. Therefore, if recording is performed in such a state, the magnetic ink in the area where two opposing electrodes 1 are applied and recorded will fly easily, and this area will have a higher density than other areas (<1) recording. Causes unevenness. In addition, since the surface potential on the recording paper 11 becomes too high, magnetic ink is ejected from the needle electrode 6 to which no high voltage pulse is applied due to the insulating pressure and the surface potential of the recording paper 11. As a result, the image becomes very noisy.

The present invention solves the above-mentioned problems, and provides a magnetic ink recording device with a very simple structure that is free from density unevenness and magnetic ink noise flying.

The specific configuration of the present invention will be explained below with reference to FIGS. FIG. 4 is a schematic diagram of the counter electrode of the magnetic ink recording device according to the present invention. On an insulating base 3, two rows of equal pitch counter electrodes are arranged with a 1/2 pitch shift (hereinafter referred to as staggered counter electrodes 12) by etching or other means, and are fixed to the support base 2. . The staggered counter electrodes 12 are connected to a high voltage pulse generation circuit (not shown) via a connector 4.

FIG. 6 shows an IJ sock configuration of a magnetic ink recording device using staggered counter electrodes 12 according to the present invention. Needle electrode 6
is equal pitch (recording density is 8 dots)/12 in case of IIB
．． They are arranged at a pitch of 6 μm), and every 32 are electrically connected. One pitch of the staggered counter electrodes 12 corresponds to 16 needle electrodes 6, and the first staggered counter electrode 1
The needle electrodes 6 numbered 1 to 4 correspond to 2a, the needle electrodes 6 numbered 1 to 12 correspond to the second staggered counter electrode 12b, and the needle electrodes 6 numbered 1 to 12 correspond to the third staggered counter electrode 12c. , numbers 6 to 20
The needle electrodes 6 up to the number correspond to the fourth staggered counter electrode 12d.
The needle electrodes 6 from No. 13 to No. 28 correspond to the above.

Similarly, 16 needle electrodes 6 each face one staggered opposing electrode 12. By arranging the opposing electrodes in this manner, a gap between the opposing electrodes can be eliminated. When recording using this matrix configuration, a control signal is sent to the square needle electrode control circuit 8 and the needle electrode high voltage pulse generation circuit 6a, and high voltage pulses are applied to every 32 needle electrodes 6 from the first needle electrode. . At this time, the 1st, 33rd, 66th
When there is an image on a dot corresponding to every 32 needle electrodes 5, etc., a control signal corresponding to the image signal from the staggered counter electrode control circuit 14 is sent to the staggered counter electrode 12 facing the corresponding needle electrode 6. A high voltage pulse signal generated by the staggered counter electrode high voltage pulse generation circuit 13 is applied.

In this way, the needle electrode high-voltage pulse generating circuits 6 are sequentially selected from 6a to 6z, and images are recorded using the staggered opposing electrodes 12 facing each needle electrode 5.

In this case, when recording with needle electrodes 5 from No. 1 to 8, use the staggered opposing electrodes 12b, when recording using needle electrodes 6 from No. 9 to 16, use the staggered opposing electrodes 12c, and from No. 17 to 24, use the staggered opposing electrodes 12c. When recording with the needle electrodes 6 up to the number, use the staggered opposing electrodes 12d, and so on, so that only the central portion of the staggered opposing electrodes 12 is always opposed to the needle electrodes 6 for recording. At the same time, it is possible to eliminate the situation in which magnetic ink is caused to fly using two staggered opposing electrodes.

As described above, according to the present invention, by arranging the counter electrodes in two rows in a staggered manner and performing recording using only one counter electrode at all times, recording can be performed while keeping the surface potential of the recording paper constant at all times. I can do it,
It is possible to obtain clear images by preventing density unevenness and flying noise of magnetic ink caused by fluctuations in the surface potential of the recording paper. Furthermore, according to the present invention, since recording is performed using the needle electrodes facing only near the center of the staggered counter electrodes, the positioning accuracy of the needle electrodes and the staggered counter electrodes in the main scanning direction can be coarse.
Also, the manufacturing precision of the staggered counter electrodes is low and good.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of the recording section of a conventional magnetic ink recording device, FIG. 2 is a schematic diagram of the counter electrode in the same section, FIG. 3 is a matrix configuration diagram of the needle electrode and counter electrode in the same section, and FIG. The figure is an explanatory diagram showing the surface potential of the recording paper when the same counter electrode is used. FIG. 5 is a schematic diagram of the counter electrode of the magnetic ink recording device according to the present invention. FIG. FIG. 3 is a matrix configuration diagram. 11.0.Counter electrode, 2..Support stand, 3..
...Base, 4φ...Connector, 5...
... Needle electrode, 6.0... Needle electrode high voltage pulse generation circuit, 7... Counter electrode high voltage pulse generation circuit, 8...
...Needle electrode control circuit, 9...Counter electrode control circuit, 10...Bias power supply, 11...
・Recording paper, 12...Staggered counter electrode, 1300・Fist staggered counter electrode high voltage pulse generation circuit, 14...Staggered counter electrode control circuit, 15 Fist...Meet/uplift magnet, 1
6...φ supply slit magnet, 17...
Magnetic ink, 18... Ink chamber, 190...
・Stylus base.

Claims (1)

[Claims] A plurality of needle electrodes each having magnetic ink held at the tip using magnetic force, a plurality of counter electrodes, a selection signal applied to the needle electrodes, an image signal applied to the counter electrodes, and arranged near the counter electrodes. a flying means for causing magnetic ink to fly from the tip of the needle electrode onto the recording paper, and the opposing electrode rows are arranged in two rows in a staggered manner, and one opposing electrode on one side is connected to two opposing electrodes on the other side. are arranged on the same surface so as to face each other, and
A magnetic ink recording device characterized by applying a voltage to each of the opposing electrodes in a column.