JPH0357865B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a magnetic ink recording device that is easy to handle and records uniform images with less noise by arranging internal electrodes in two rows in a staggered manner. The purpose of the present invention is to provide a magnetic ink recording device that can.

FIG. 1 shows a cross-sectional view of a recording section of a conventional magnetic ink recording device. In this figure, a needle electrode 5 placed on a stylus base 19 is magnetized by a bump magnet 15. On the other hand, the magnetic ink 17 sent into the ink chamber 18 is sent to the tip of the needle electrode 5 through the slit portion formed by the bump magnet 15 and the supply slit magnet 16. A counter electrode 1 fixed on a support base 2 is connected to a needle electrode 5 via a recording paper 11.
is facing. A bias voltage is always applied between the needle electrode 5 and the counter electrode 1, and when a positive high voltage pulse signal is applied to the needle electrode 5 and a negative high voltage pulse signal is applied to the counter electrode 1, the recording paper 11 The strength of the electric field between the magnetic ink 17 at the tip of the needle electrode 5 increases, and even the magnetic ink 17 acts on the magnetic ink 17 at the tip of the needle electrode 5.
Fly above 1.

FIG. 2 shows a schematic configuration diagram of a conventional counter electrode.
In this figure, counter electrodes 1 are formed on an insulating base 3 by a method such as etching at equal pitches (for example, 2 mm, distance between electrodes 200 μm), and are connected to a high voltage pulse generation circuit by a connector 4.

A conventional matrix configuration diagram of the counter electrode 1 and the needle electrode 5 shown in FIG. 2 is shown in FIG. The needle electrodes 5 are arranged at equal pitches (125 μm pitch when the recording density is 8 dots/mm) and are electrically connected every 32 needles. The pitch of the counter electrode 1 corresponds to 16 needle electrodes, and needle electrodes numbered 1 to 4 face the first counter electrode 1a, and the needle electrodes numbered 1 to 4 are opposed to the first counter electrode 1a.
Needle electrodes numbered 5 to 20 are opposed to the counter electrode 1b, and needle electrodes numbered 21 to 37 are opposed to the third counter electrode 1c. As described above, the 16 needle electrodes 5 are arranged so that one counter electrode faces them. When recording an image using this matrix configuration, first, a control signal is sent from the needle electrode control circuit 8 to the needle electrode high voltage pulse generation circuit 6a.
A selection signal is sent to every 32 needle electrodes 5 from the th. At this time, if there is an image on a dot corresponding to the 1st, 33rd, 65th, etc. needle electrode 5, the image signal from the counter electrode control circuit 9 is applied to the counter electrode 1 that the needle electrode 5 is facing. A high voltage pulse signal generated by the counter electrode high voltage pulse generation circuit 7 is added based on the control signal. On the other hand, a DC bias is applied between the opposing electrodes of the needle electrode 5 by a bias power supply 10, and when a high voltage pulse is applied to the partner of the needle electrode 5 and the opposing electrode 1, the magnetic ink 17 at the tip of the needle electrode 5 is It flies and forms an image. In this way, the needle electrode high voltage pulse generation circuits 6 are sequentially selected from 6a to 6z, and images are sequentially formed using the counter electrode 1 facing each needle electrode 5. However, the gap between the opposing electrodes 1, such as between the opposing electrodes 1a and 1b, 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 with the accuracy of alignment between the needle electrode 5 and the counter electrode 1, when recording with the needle electrodes 5 facing each other near the gap of the counter electrode 1, the same image signal should be input to both the left and right counter electrodes. Records must be made. For example, when recording from the needle electrode 5b to the needle electrode 5h 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. FIG. 4 shows the distribution of surface potential appearing on the recording paper in contact with the counter electrodes 1a and 1b in this case. The graph shown in the upper part of this figure shows the potential distribution in the main scanning direction on the steam paper 11, and the broken line shows the potential distribution in the main scanning direction on the steam paper 11.
a shows the case where the electrode is applied to the counter electrode 1b alone, and the solid line shows the case where the voltage is applied to both the counter electrodes. When a voltage is applied to the two opposing electrodes 1 as shown in this graph, the potential near the gap between the opposing electrodes 1 becomes high. Therefore, if the above is carried out in such a state, the magnetic ink in the area to be recorded by applying two opposing electrodes 1 will be extremely likely to fly away.
Only this portion has a higher density than other portions, resulting in a recording ram. In addition, since the surface potential on the recording paper 11 becomes too high, magnetic ink flies off even from the needle electrode 5 to which no high voltage pulse is applied due to the bias voltage and the surface potential of the recording paper 11.
As a result, the image becomes an image with many nozzles.

The present invention solves the above-mentioned problems, and provides a magnetic ink recording device which has a very simple structure and is free from uneven density and no flying magnetic ink.

The specific configuration of the present invention will be described below with reference to FIGS. 5 and 6. 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 equally spaced counter electrodes are arranged with a 1/2 pitch shift (hereinafter referred to as staggered counter electrodes 12) by means such as etching, 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 a matrix configuration diagram of a magnetic ink recording device using staggered counter electrodes 12 according to the present invention. The needle electrodes 5 are arranged at equal pitch (recording density is 8 dots/
mm, they are arranged at a pitch of 125 μm), and every 32 wires are electrically connected. Staggered counter electrode 1
1 pitch of 2 corresponds to 16 needle electrodes 5, and the first staggered opposing electrode 12a has 1 to 4 needle electrodes.
The numbered needle electrode 5 corresponds to the second staggered counter electrode 12.
Needle electrodes 5 numbered 1 to 12 correspond to b, needle electrodes 5 numbered 5 to 20 correspond to the third staggered counter electrode 12c, and needle electrodes 5 numbered 5 to 20 correspond to the fourth staggered counter electrode 12d.
Needle electrodes 5 from No. 13 to No. 28 correspond to the above. Similarly, 16 needle electrodes 5 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, first a control signal is sent from the electrode control circuit 8 to the needle electrode high voltage pulse generation circuit 6a.
A high voltage pulse is applied to every 32 needle electrodes 5 from the first. At this time, 1st, 33rd, 65th etc. 32
When there is an image on a dot corresponding to every other needle electrode 5, the corresponding needle electrode 5 is placed in a staggered manner by a control signal corresponding to an image signal from the staggered counter electrode control circuit 14 to the facing staggered counter electrode 12. A high voltage pulse signal generated by the 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, numbers 1 to 8
When recording with needle electrodes Nos. 5 to 16, use the staggered opposing electrodes 12b, when recording with needle electrodes 5 from No. 9 to 16, use the staggered opposing electrodes 12c, and when recording with needle electrodes 5 from No. 17 to 24. When recording, staggered opposing electrode 1
2d, so that only the center of the staggered opposing electrode 12 is always opposed to the needle electrode 5 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, it is possible to perform recording while keeping the paper surface potential always constant. It is possible to obtain clear images by preventing density unevenness and magnetic ink nozzle flying caused by fluctuations in recording paper surface potential. moreover,
According to the present invention, since recording is performed using the needle electrodes facing only near the center of the staggered counter electrodes, the alignment accuracy of the needle electrodes and the staggered counter electrodes in the main scanning direction does not need to be coarse, and the manufacturing accuracy of the staggered counter electrodes can also be improved. Rough and good.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a recording section of a conventional magnetic ink recording device, FIG. 2 is a schematic diagram of a counter electrode in the same section, FIG. 3 is a matrix configuration diagram of a needle electrode and a 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. 1... Counter electrode, 2... Support stand, 3... Base,
4... Connector, 5... Needle electrode, 6... 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, 13...Staggered counter electrode high voltage pulse generation circuit, 14...Staggered counter electrode control circuit, 15...Elevation magnet, 16...Slit magnet for supply, 17...Magnetism Ink, 18...
...Ink chamber, 19...Stylus base.

Claims (1)

[Claims] 1 Use magnetism to hold magnetic ink at the tip,
and a plurality of needle electrodes forming one row, a plurality of counter electrodes arranged in two rows so as to sandwich the row of needle electrodes to face the needle electrodes, and a selection signal and a signal to the needle electrodes. flying means for applying an image signal to each of the opposing electrodes and causing magnetic ink to fly from the tip of the needle electrode onto a recording paper disposed near the opposing electrode, one of the opposing electrodes being one of the plurality of needle electrodes; The counter electrodes forming one row of the counter electrodes and the counter electrodes forming the other row are arranged in a staggered manner, and one of the counter electrodes forming one row is connected to the other counter electrode. A magnetic ink recording device arranged to face two opposing electrodes forming a row, characterized in that during recording, only the central portion of the opposing electrodes is opposed to the needle electrode. Magnetic ink recording device.