JPS61279564A - Electrostatic multineedle recording head - Google Patents

Abstract

PURPOSE:To sharply reduce the number of assembling processes and to obtain an electrostatic multineedle recording head having a high abrasion resistance and durability by a construction wherein a group of recording electrodes in a large number which are constructed by forming a large number of slits in a conductive thin film are formed integrally on one side of a ceramic substrate, and a plurality of control electrodes are formed integrally on the other side of the ceramic substrate. CONSTITUTION:An electrostatic multineedle recording head 1 has a construction wherein a large number of recording electrodes 3 are formed on the opposite sides of a pair of ceramic substrates 2 disposed opposite to each other and the groups of the recording electrodes 3 on the two ceramic substrates 2 are so disposed as to form a zigzag. On each of the ceramic substrates 2, control electrodes 5 are formed on a recording surface whereon the end faces of the recording electrodes 3 are positioned and on a part of the side adjacent to the recording surface, and the recording electrodes 3 and the control electrodes 5 are insulated from each other by thin layers of the ceramic substrates 2 themselves interposed therebetween. The recording electrodes 3 form slits in a conductive thin film formed by coating on the side of each ceramic substrate 2, low-melting glass 6 is filled up in these slits, and thereby the two ceramic substrates 2 and a separator 4 are joined integrally.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an electrostatic multi-needle recording head used in a recording section of an information recording device such as a facsimile machine.

2. Description of the Related Art In general, an electrostatic multi-needle recording head using a multi-stylus solid-state scanning method, as shown in FIG. 11, groups a large number of recording electrodes a and connects them in a matrix.
The configuration is such that control electrodes are arranged corresponding to a predetermined number of recording electrodes a. The control electrode group is connected to an M-bit shift register, and the two recording electrode groups are each connected to an m-bit shift register, and a driver circuit including these shift registers controls the selected recording electrode a and the control electrode. The electrostatic latent image recording is performed sequentially between the electrodes.

The recording electrode group has conventionally been constructed by regularly arranging and fixing a large number (for example, 2048) of recording electrode wires made of ultra-fine coated copper wires with a wire diameter of 0.1 mm in parallel at a pitch of 0.125 m. , the alignment method is as follows:
For example, as shown in Japanese Patent Publication No. 56-25390, recording electrode wires are aligned in guide grooves formed at 0.125 fin pitch on a wire arrangement table, and a bonding agent is applied onto these recording electrode wires. There is a known method for fixing it. Then, the recording electrode unit 20 is constructed by sandwiching the thus obtained recording electrode group between a pair of substrates made of glass epoxy resin plates and fixing them using an adhesive. Printed circuit board 23
Then, as shown in FIG. 10, a plurality of control electrodes 21 (for example, 65111) are placed on both outer surfaces of this recording electrode unit 20, and molded with epoxy resin or the like using mold jigs 24, 25, and 26. The recording electrode unit 20 and the control electrode 21 are formed by forming an exterior body of synthetic resin.
was embedded and fixed to form an electrostatic multi-needle recording head.

Problems to be Solved by the Invention However, the above conventional example has the following problems. In other words, since the recording electrode group or recording electrode unit and the control electrode are made separately and then both are integrally molded from synthetic resin, the relative positional accuracy of the recording electrode and the control electrode may be distorted, and the number of assembly steps may be reduced. There were problems such as spending a large amount of money.

In addition, the exterior body is made of synthetic resin, the substrate of the recording electrode unit is made of glass epoxy resin, and the adhesive for the recording electrode wire is also a synthetic resin adhesive, so it has poor abrasion resistance and lacks durability. There was also the problem.

Means for Solving the Problems In order to solve the above problems, the present invention integrally forms a group of recording electrodes on one side of a ceramic substrate, each consisting of a large number of slits formed in a conductive thin film. , a plurality of control electrodes are integrally formed on the other side surface of the ceramic substrate.

Function Since the present invention has the above-mentioned configuration, by integrally forming both the recording electrode group and the control electrode on one ceramic substrate, the relative positional accuracy of both is increased, and
Since the process of accurately aligning the recording electrode group and control electrodes during assembly is omitted, assembly man-hours are significantly reduced, and the head base material is a ceramic substrate, which provides high wear resistance and durability. It turns out.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings.

In FIGS. 1 to 4, reference numeral 1 denotes an electrostatic multi-needle recording head, in which a large number of recording electrodes 3 are integrally formed on opposing sides of a pair of ceramic substrates 2, which are disposed facing each other. The three groups of recording electrodes on the two ceramic substrates 2 are arranged so that each recording electrode 3 is staggered, and
The recording electrodes 3 are insulated by a separator 4 made of an insulating thin plate interposed between the ceramic substrates 2 and 2, so that the recording electrodes 3 can be arranged at high density. Each ceramic substrate 2 has 1. A control electrode 5 is formed over a part of the recording surface where the end surface of the recording electrode 3 is located and a side surface adjacent thereto, and a ceramic substrate 2 is formed between the recording electrode 3 and the control electrode 5.
It is insulated by a thin intervening layer of itself. A plurality of control electrodes 5 are formed, each of which corresponds to a predetermined number of recording electrodes 3.

The recording electrode 3 is constructed by forming a slit in a conductive WI film coated on the side surface of a ceramic substrate 2, and this slit is filled with a low melting point glass 6. Both the ceramic substrates 2 and the separator 4 are integrally joined to form a head main body 10. The control electrode 5 is formed in advance by integrally firing the ceramic substrate 2 or by metallizing the ceramic substrate 2 in a predetermined pattern.

The three groups of image recording electrodes are connected in a matrix to printed wiring on a printed circuit board 8 via a flexible wiring board 7. Further, the head main body 10 and the printed circuit board 8 are integrated by an exterior frame 9 formed by resin molding, and the circuit portions of the flexible wiring board 7 and the printed circuit board 8 are arranged in this exterior frame 9. A hollow portion 9a is formed, and windows 9b penetrating the hollow portion are opened on both sides. Reference numeral 11 designates I plates attached to both sides of the exterior frame 9.

Next, the manufacturing process of the electrostatic multi-needle recording head 1 will be explained with reference to FIGS. 5 to 9. First, as shown in FIGS. 5 and 6, a ceramic substrate 2 is manufactured, in which a control electrode conductor 5 having a cross-sectional shape is integrally fired in a predetermined pattern at one corner, and its surface is coated with an ultrasonic solvent. After cleaning and drying, a base treatment is applied to one adjacent side surface, and a conductive material of copper, copper alloy, stainless steel, nickel, etc. is formed by plating or vacuum deposition.This conductive thin film 12
The appropriate thickness is about 40 μm.Next, as shown in FIG. 7, a slit 13 is formed in the conductive W 111112 using a laser beam 16 from a laser device 15 to form a recording electrode 3.

When a neodymium YAG laser is adopted as the laser device 15 and its second harmonic (wavelength 0.532 μm) is used,
Suitable for processing copper and copper alloys. By this slit processing, the recording electrode 3 is formed into a rectangular cross-sectional shape with a width of 52 μm, for example. The slit 13 is formed by hollowing out the surface layer of the ceramic substrate 2 to ensure insulation between the recording electrodes 3. In this way, the control electrode 5 is formed in advance on the side surface of one ceramic substrate 2,
conductive ff integrally formed on a side surface adjacent to the side surface;
By slitting 151112 to form the recording electrode 3, the positional accuracy between the two can be made extremely high.

Next, one end of the conductor of the flexible wiring board 7 is connected to the recording electrode 3, and the other end is matrix-connected to the printed circuit board 8, and then the two ceramic substrates 2 processed as described above are connected to the recording electrode. 3 facing each other and with a separator 4 interposed between them, they are integrally joined with a low melting point glass 6 to constitute the head main body lO,
The head body 10 and the printed circuit board 8 are held in a molding jig (not shown) and molded with resin, and the head body 10 and the printed circuit board 8 are integrated with the exterior frame 9 formed as shown in FIG. As shown in FIG. 9, the head surface is ground into a circular arc surface. Thereafter, by attaching the cover plate 11 to the exterior frame 9, the electrostatic multi-needle recording head 1 is completed.

The present invention can be configured in various ways other than those shown in the above embodiments. For example, the recording electrodes 3 formed on a pair of ceramic substrates 2 as described above may be arranged in a staggered manner with a separator 4 interposed therebetween. Instead of arranging the recording electrodes 3, the recording electrodes 3 of both ceramic substrates 2 can be arranged in a line so that they are fitted into the slits 13 between the recording electrodes 3 on the other side. In addition, the recording electrode 3 and the control electrode 5
The shape, dimensions, manufacturing method, etc. are not limited to those shown in the above embodiments.

Effects of the Invention According to the electrostatic multi-needle recording head of the present invention, by integrally forming both the recording electrode group and the control electrode on one ceramic substrate as described above, the relative position of both electrodes can be determined with high precision. Can be set. Further, the process required for accurately positioning the recording electrode group and the control electrodes during assembly can be omitted, and the number of assembly steps can be significantly reduced. Furthermore, since the base material of the head is made of a ceramic substrate, it exhibits great effects such as high wear resistance and a durable electrostatic multi-needle recording head.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional side view of one embodiment of the present invention, and FIG.
Figure nn perspective view, Figure 3 is a partially enlarged view of Figure 2, Figure 4 is an enlarged view of Figure 2.
The figures are overall perspective views of the same embodiment, Figures 5, 6, 7,
8 and 9 are perspective views showing the manufacturing process, FIG. 10 is a perspective view of a conventional example, and FIG. 11 is a circuit diagram of an electrostatic multi-needle recording head. 1・−・・−・・−・−・−−−−−・−・−・・
・・・−・・Electrostatic multi-needle recording head 2−・・−・−・−
・・−・−・・−・・−・−・−Ceramics substrate 3−
・−・・−−−−−・−・−・・−・−−−−
1-・--・-Recording electrode 5・-----------・・-・-
−−−−−・−・−−−−−−1−・・−・=−・Control electrode.

Claims (1)

[Claims] (1) On one side of the ceramic substrate, a group of recording electrodes made up of many slits formed in a conductive thin film are integrally formed, and on the other side of the ceramic substrate, a plurality of control electrodes are integrally formed. An electrostatic multi-needle recording head characterized by: