JPH03114757A - Electrostatic multineedle recording head and production thereof - Google Patents

Abstract

PURPOSE:To improve productivity and reliability by a method wherein one exposed part of a sheet-form electrode wire component part is fixed with a resin as a recording part of a head, and the other exposed part is connected to a predetermined circuit pattern on a circuit substrate. CONSTITUTION:In the case of electrode trains of N pieces X M sets, in a sheet- form electrode wire component part 1, N pieces of electrode wires 2 of the same fine pitch as an electrode pitch on a head surface are fixed to both end parts and inside parts thereof with resins 3-6, and exposed parts 7-9 are formed. The sheet-form electrode wire component part 1 is disposed by positioning the exposed part 7 between right and left circuit substrates 20 by a wire positioning body 26. The wires 2 of the exposed parts 8, 9 are each connected to a circuit pattern. A resin block is loaded on a plate jig 25, and the wires 2 are integrally fixed by charging a resin. The wires 2 are cut in half at the center thereof to serve as a recording part of a head. In this manner, productivity and reliability can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an electrostatic multi-needle recording head that can be used in information recording equipment such as facsimiles and plotters, and a method for manufacturing the same.

(Conventional technology) Electrostatic multi-needle recording pads apply high voltage to each electrode, so
While it is necessary to maintain a constant distance between adjacent electrodes, it is also necessary to increase the number of electrodes per unit length as much as possible. The wire rods 2 are arranged in a staggered manner to constitute a first electrostatic multi-needle electrode array and a second electrostatic multi-needle electrode array. Here, when the pitch of the electrode wires in each electrode row is pl, and the mutual pitch between the electrode wires constituting one electrode row and the other electrode wire is p2, the dimensional relationship p□=2P2 is satisfied. It has become.

In the electrostatic hook 1111 recording head configured in this way, when the recording density is 400 Df)f, the electrode spacing is 63.
It is extremely small, such as 5 μm, and the length of the entire helenoid ranges from several tens of cm to over 1 m, so the number of electrodes ranges from several thousand to over 10,000, which is extremely large. Therefore, if the electrodes were individually wired to the circuit board one by one, the number of circuit patterns would be enormous, and the order of the wiring would be likely to be incorrect. Therefore, as shown in FIG. 15, the electrodes 52 made of a large number of wire rods are divided into a predetermined number of blocks M groups each having a predetermined number of 8, and the electrodes 52 in a predetermined order in each block are arranged in a predetermined circuit pattern 51- 71-
A method of wiring in a box shape is used. A common electrode (not shown) is arranged corresponding to each block, and by selecting one of the common electrode and the circuit pattern 51 and applying a high voltage between them, information for one dot can be recorded. It is well known that image information can be recorded by successively performing this operation. Reference numeral 50 indicates a connector for connecting the N circuit patterns 51 to an external circuit, and power is supplied to each electrode 2 via this connector 50 and the circuit pattern 51.

Now, as described above, there are various methods of dividing a large number of electrodes 52 into a predetermined number of blocks and wiring them in a matrix in a circuit pattern. The method described in Japanese Patent Publication No. 56-25390 is one such method, in which electrode wires in a common order among the electrode wires of each block are intensively soldered to a common circuit pattern.

Another example is the one described in Japanese Utility Model Application No. 62-128835. This consists of each electrode formed on an insulating substrate,
Input conducting wires to the electrode groups divided into blocks are arranged through an insulating layer, and an opening is formed in the insulating layer at the intersection of a predetermined electrode group and the corresponding input conducting wire. The electrode is filled with plating to connect the electrode and the input conductor.

(Problem to be solved by the invention) According to the method described in Japanese Patent Publication No. 56-25390, since the electrode wires intersect in a complicated manner, the wires are likely to become tangled and break, or the coating may peel off, causing short circuits. There is a problem like this.

Furthermore, according to the method described in Japanese Utility Model Application Publication No. 62-1.28835, since the board must be made of multiple layers, the structure of the board becomes complicated, and the size of the opening must be adjusted to ensure the reliability of the connection. It is necessary to increase the size to some extent, so it is not suitable for high density.

The present invention was made in order to solve the problems of the prior art, and makes it possible to connect electrode wires without crossing each other, thereby preventing disconnection and short-circuiting of the wires, and improving productivity and reliability. An object of the present invention is to provide an electrostatic multi-needle recording head and a method for manufacturing the same that can improve the performance.

(Means for Solving the Problems) The electrostatic multi-needle recording head according to the present invention has a large number of wires forming a large number of electrodes, with a predetermined portion exposed for each number corresponding to a circuit pattern on a circuit board. It is constructed as a sheet-shaped electrode wire component held at a predetermined pitch interval, one exposed part of the sheet-shaped electrode wire component is fixed with resin to serve as a recording part of the head, and the other exposed part is fixed to a predetermined circuit on the circuit board. It is characterized by being connected to a pattern.

When the electrodes are composed of N×M electrode rows, the number of wires in one sheet-like electrode wire component may be N, an integral multiple of N, or − an integral number of N.

A plurality of sheet-shaped electrode wire parts 117 are connected to the surface of a plurality of circuit boards, and even if one exposed part of the wire of the sheet-shaped electrode wire component connected to the surface of the circuit board is arranged in a straight line. good.

The method for manufacturing an electrostatic multi-needle recording head according to the present invention is performed by holding wires at a predetermined pitch with predetermined portions exposed for each N or an integral multiple of N or an integer fraction of N. A predetermined number of sheet-like electrode wire parts are used, and one exposed part of a predetermined number of sheet-like wire parts is positioned and held by a wire positioning member so that the wires are arranged at a predetermined arrangement pitch, and each wire in the other exposed part is connected to a circuit. It is characterized in that it is connected to a predetermined circuit pattern on a substrate, and one of the exposed parts is fixed with resin to serve as a recording part of the head.

(Function) In the present invention, the electrode wire can be treated as a sheet-shaped electrode wire component, and one exposed part of the sheet-shaped electrode wire component fixed with resin is used as the recording part of the head,
The other exposed portion can be connected to a predetermined circuit pattern.

(Example) Hereinafter, an example of an electrostatic multi-needle recording head and a manufacturing method thereof according to the present invention will be described with reference to the drawings.

FIG. 1 shows an example of a sheet-like electrode wire component used in the present invention. When the sheet-like electrode wire component 1 is composed of N electrode wires x M sets of electrode rows, the N electrode wires 2, resins 3 and 4 fixed at both ends thereof, and resin fixed on the inner side thereof. 5 and 6. The electrode wire 2 is made of resin 5, 6
The space between the electrodes is an exposed portion 7, and the electrodes are held parallel to each other so as to have the same minute pitch as the electrode pitch on the head surface. Further, the wire rod 2 is held in the resins 5 and 6 by being bent at right angles and in opposite directions. Electrode wire 2
The pitch of the bent portion in the perpendicular direction is large enough to not interfere with soldering, which will be described later, with respect to the fine pitch portion. The electrode wire 2 has an exposed portion 7 formed between the resins 5 and 6, and exposed portions 8 at both ends between the resins 4 and 6 and between the resins 3 and 5, respectively.
,9 are formed. The exposed portion 8.9 is formed obliquely with respect to the direction of the electrode wire 2. The sheet-like electrode wire component 1 shown in FIG. 1 substantially constitutes two electrode wire components, and is finally cut at the center of the exposed portion 7 of the wire 2.

Therefore, if we look at one sheet-shaped electrode wire component,
The exposed portions 7 and 9 become exposed portions on both sides of the electrode wire component.

The number of electrode wires 2 per one sea I-shaped electrode wire component 1 is not limited to N and may be set as appropriate; however, when the recording head electrodes are composed of N electrodes x M sets of electrode rows, In terms of control, it is preferable to set the number of electrode wires 2 per one sheet-like electrode wire component 1 to an integral multiple of N or a negative fraction of N.

Here, an example of a method for manufacturing the sheet-like electrode wire component 1 will be explained. First, as shown in FIG. 2, using a ram 11 having axial grooves 12 formed on its outer periphery and grooves formed at a predetermined array pitch on its circumferential surface, electrodes are placed along the grooves on the circumferential surface. The wire rod 2 is wound to position and fix the electrode wire rod 2 at a predetermined pitch. In this state, resin is poured into the groove 12 and onto it, and the wire 2 is inserted into the resin 1 as shown in FIG.
Fix it at 3. Furthermore, the fixing part made of resin 13 is attached to the groove 12.
Cut along the center and fix both ends with resin to make a wire part. In Fig. 4, the wire rod 2 and the resin 1 at both ends thereof
3.13 is the above-mentioned wire rod part. The pitch of each wire 2 at this point, and therefore the pitch of the grooves on the circumferential surface of the drum 11, may be considerably larger than the pitch of the electrode wires on the final head surface.

Next, as shown in FIG. 4, a pair of plates 144, 16 having the same number of pins 15° 17 as the number of wire rods 2 constituting the above-mentioned two wire parts are prepared, and the resin 13 at both ends is prepared. .13 to apply a certain amount of tension to the wire rod 2, each plate 14.16 is parallel to each other, but at an angle to the wire rod 2, and each play 1-1, 4.
, 16 pins 15 and 17 are applied to each wire rod 2. At this time, each pin 15 of play I 14 is applied to the lower side of each wire rod 2, and each pin 17 of play I 16 is applied to the upper side of each wire rod 2. In this state, as shown in FIG.
, 6 diagonally downward in the longitudinal direction, and bend each wire 2 from the position of each pin 15, 17. Plate] 6
Along with the above movement, the resin 13 at one end is also moved in parallel. In this way, when each wire 2 is bent at a right angle at the position of each pin 15, 1.7, the pitch of the middle part of the wire 2 is adjusted to a predetermined minute pitch on the side surface of the spatula 1, as explained in FIG. Set to match the pitch. In this state, both ends of each wire 2 are fixed with resin to form the resin parts 3, 4 fused to the resins 13, 1.3. Furthermore, the resin part 3,
By hardening the inner side of the electrode wire part 4 with the resin parts 5 and 6, a sheet-like electrode wire component 1 as shown in FIG. 1 is obtained.

- Each wire 2 constituting the sheet-shaped electrode wire component described in
Connected to the circuit pattern on the circuit board. FIGS. 6 and 7 show examples of the above circuit board.

The circuit board 20 has the same number of circuit patterns 21 as the number of wire rods 2 constituting one sheet-like electrode wire component 1 in parallel at a predetermined relatively wide pitch on both the front and back surfaces, and each circuit pattern 21 One end is connected to a terminal pattern 22 provided at one end of the circuit board 20. The terminal pattern 22 is connected to an external circuit through a suitable connector. In each circuit pattern 21, lands 24 for attaching half Bff are formed at regular intervals. The lands 24 are formed as a land group 23 having a predetermined correspondence relationship between adjacent circuit patterns 21. Land group 23 is
They are formed at regular intervals and are lined up along a line inclined with respect to the direction of the circuit pattern 21. Each land 24 constituting the land group 23 is formed with a relative positional relationship corresponding to each wire 2 in the exposed portion 8 or 9 of the sheet-like electrode wire component 1.

The sheet-shaped electrode wire component 1 is attached to the circuit board 20.
are connected in the form shown in Figures 8 to 1-0. In FIG. 8, two circuit boards 20 are used and are arranged in parallel with a constant interval. Circuit board 20.
A pair of wire positioning holes 26.degree. 2G are arranged at regular intervals between the electrode wires 20 and 20 for setting the distance between the respective electrode wires. As shown in FIG. 10, the wire positioning body 26
．． 26 has a number of grooves 28. The grooves 28 are formed in a direction perpendicular to the longitudinal direction of the wire positioning bodies 26, 26, and are formed at the same minute pitch as the electrode pitch in the spatula 1. A flat plate jig 25 is disposed between the wire rod positioning bodies 26 and 26 for aligning the linearity of each wire rod 2.

A plurality of sheet-like electrode wire components 1 are placed on one side of the two circuit boards 20.20 at intervals of -.20, spanning the two circuit boards 20.20.

Each sheet-like electrode wire component 1 has exposed portions 8.9 at both ends thereof.
are placed on the runs 1 to group 23 of one circuit board 20 and the runs 1 to 2 of groups 23 of the other circuit board 20, respectively.

The intermediate exposed end portion 7 of each sheet-shaped electrode wire component is positioned in the gap 12 between the two circuit boards 20, 20 using a wire positioning member 26 so as to maintain a predetermined head spacing. Similarly, a plurality of sheet-like electrode wire components 1 are placed on the back side of the circuit board 20.20 at regular intervals so as to be positioned between the wire components 1 on the front side. Therefore, by arranging a plurality of sheet-like electrode wire components 1 arranged on both the front and back surfaces of the circuit boards 20, 20, the wire rods 2 on both the front and back surfaces in the exposed portion 7 can be continuously arranged with a predetermined head electrode interval. become. That is, the circuit board 20°20
Exposed portion 7 of sheave-shaped electrode wire component 1 on one side of sheet 1
Assuming that the mutual spacing is A, the spacing A is the same as the spacing between the exposed portions 7, and the exposed portions 7 of the sheet-like electrode wire component 1 on the back side are located at this spacing A. . Also, put the wire rods 2 on both the front and back sides of the circuit boards 20, 20 one by one into the container 28 of the wire rod positioning body 26.26,
The wire rods 2 are arranged in a line at the predetermined pitch. moreover,
On the opposite side of the wire rod positioning body 26.26 and the flat plate jig 25, holding each wire rod 2, a pair of wire rod holding pins 27.27 are provided.
Place the double wire rods 2 securely on each surface 28 of the wire rod positioning body 26, and press each wire rod 2 so that it hits the blood on the flat plate jig 25. In this state, each wire rod 2 crossing the exposed portions 8 and 9 of each sheet-like electrode wire component 1 is connected to the run constituting the runt group 23].
Solder the corresponding run 1 to 24 of 24. The direction of each wire 2 crossing the exposed portion 8°9 is the circuit pattern 2.
The distance between the wire rods 2 extending across the exposed portions 8 and 9 is wide as described in I) 1, and correspondingly, the distance between the wire rods 2 extending across the exposed portions 8 and 9 is wide. Since the spacing is also wide, the solder does not span adjacent wire rods 2 or circuit patterns 21 in a bridge shape. thus,
Each seal L-shaped electrode wire component 1- is arranged at regular intervals in the longitudinal direction of the circuit board 20, 20, and each wire 2 is connected to the circuit pattern 21. The pair of wire rod positioning bodies 26, 26 can be formed by forming grooves 28 on one material and then dividing it into two, or by processing grooves on two materials at the same time, so that the wire rod positioning bodies 26 and 26 are aligned with each other -j You can obtain high precision. In addition, in the illustrated example, a circuit board with a circuit pattern formed on both the front and back sides is used, and both the front and back sides are used, or multiple circuit boards are used with a circuit pattern formed only on the front side, and only the front side is used. The wire 2 may be connected to the circuit pattern.

Next, as shown in FIG. 11(a), a resin plotter 29 is placed on the second part of the flat plate jig 25 while holding each wire rod 2 between them. The resin flock 29 also has approximately the same length as the flat plate jig 25.

The gap 30 between the flat plate jig 25, each wire rod 2, and the resin block 29 is filled with resin, and the resin flock 29 and the wire rod 2 are fixed together. After the resin has hardened, the flat plate jig 25 and the wire positioning bodies 26 and 26 are removed as shown in FIG. 11(b).

Next, as shown in FIG. 11(c), the resin flock 29 is cut along the longitudinal center line XX along with line I/I2,
The circuit board 20.20 and the sheet-like electrode wire component 1 are divided into two parts. On the cut surface, the end faces of the wire rods 2 appear aligned in a straight line at a predetermined arrangement pitch, as shown in FIG. The bisected circuit board 20°20 and the sheet-shaped electrode wire component 1 are
Next, as shown in FIG. 11(d), the directions of both sheet-like electrode wire parts are rotated by 90'', and the wires 2, 2 of each sheet-like electrode wire part are joined to both sides of the spacer 31.

Also, at this time, both resin blocks 29.2 divided into two
9, the end face of the wire 2.2, and the end face of the spacer 31 are positioned on the same plane. Further, as shown in FIG. 13, both circuit boards are arranged so that each wire 2 constituting one electrode row and each wire 2 constituting the other electrode row are arranged in a staggered manner with spacers 31 in between. 20. The positions of 20 and the sheet-like electrode wire component 1 are shifted by a predetermined slight dimension.

The thickness of the spacer 31 corresponds to the predetermined distance between the first electrostatic multi-needle electrode array and the second electrostatic multi-needle electrode array described with reference to FIG. 16. With each member positioned in this way, the periphery of each wire rod 2 is fixed with resin, leaving only the end face portion. At this time, a common electrode (not shown) is also fixed with resin, if necessary. By doing this, an electrostatic multi-needle recording sleeve is obtained in which the end faces of a large number of wire rods 2 are exposed in the form shown in FIG. 16 on the -plane. Many wire rods 2
The surface where the end face is exposed is polished and made smooth, and this is used as the head surface.

As is clear from the above explanation, the sheet-shaped electrode wire component 1 shown in FIGS. 1 and 8 is ultimately divided into two sheet-shaped electrode wire components. In the sheet-like electrode wire component, the exposed portion 7 and the exposed portions 8 or 9 are both ends. The wire rods 2 in the exposed portion 7 on one end are arranged at a predetermined arrangement pitch and fixed with resin to form the recording portion of the head, and the wire rods 2 in the exposed portion 8 or 9 on the other end are arranged at a predetermined arrangement pitch and fixed with resin. It is connected to each circuit pattern 21 on the circuit board 20, respectively.

According to the above embodiment, the electrode wires 2 are grouped together into a sheet electrode wire component 1 in the number corresponding to the circuit pattern 21 of the circuit board 20, and one exposed end of the sheet electrode wire component 1 is fixed with resin. Since one section is used as a recording section of the head and the other exposed end is connected to a predetermined circuit pattern, countless electrode wires 2 can be handled as a sheet-like electrode wire component 1. It is possible to connect the wires without crossing them, thereby preventing disconnection or shorting of the wire 2, eliminating the need for soldering or bridging, allowing for higher density, and improving productivity. It is possible to improve reliability.

Note that the sheet-like electrode wire component does not necessarily need to be formed into one piece that will ultimately be divided into two parts as in the above embodiment, but as can be seen from the above description, it is possible to By integrally forming the wire rods 2, it is possible to easily and accurately position each wire 2, and the first electrostatic multi-needle electrode array and the second electrostatic multi-needle electrode array can be aligned in a predetermined position. It is also convenient for positioning while determining relative positional relationships.

In addition, although it is not necessarily necessary to use both sides of the circuit board, in order to arrange the electrode wires 2 in a certain number as sheets 1 on the circuit board as sheet-shaped electrode wire components, it is necessary to use the sheet-shaped electrode wire components. It is advantageous to use both sides of the circuit board in order to avoid overlapping.

The form of the sheet-like electrode wire component is not limited to the form used in the above embodiments. For example, as shown in FIG. 14, a predetermined number of electrode wires 2 are lined up in parallel at a predetermined interval, bent at right angles in the same direction at positions closer to both ends, and both ends and the inner side are made of resin. It is also possible to fix the sheet electrode wire component 41 in the shape of a "U". The sheet-like electrode wire component 41 has exposed portions 48 near both ends.
49 degrees, and has an exposed portion 47 in the middle. This sheet-like electrode wire component 41 is also ultimately divided into two parts, with the end face of the wire 2 at the exposed portion 47 being exposed to the head surface, and the wire 2 at the exposed portion 48° 49 having a circuit pattern. connected to.

(Effects of the Invention) According to the present invention, the electrode wires are grouped together into a sheet-like electrode wire component according to the number corresponding to the circuit pattern of the circuit board, and one exposed portion of the sheet-like electrode wire component is fixed with 461 resin. is used as the recording part of the head, and the exposed part of the other side is connected to a predetermined circuit pattern. Therefore, countless electrode wires can be handled as seal L-shaped electrode wire parts. It is possible to connect the wire without causing any damage, thereby preventing disconnection or short-circuiting of the wire, enabling higher density, and improving productivity and reliability.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an example of a sheet-like electrode wire component that can be used in the present invention, FIG. 2 is a perspective view showing one manufacturing process of the sheet-like electrode wire component, and FIG. FIG. 4 is a side view showing the subsequent steps, FIG. 4 is a plan view showing the steps following the above manufacturing step, FIG. 5 is a plan view showing the steps following the above manufacturing step, and FIG. 6 is a circuit board that can be used in the present invention. FIG. 7 is a plan view showing an example of the same, FIG. 8 is a plan view showing an example of the above, and FIG. 8 shows one step of the method for manufacturing an electrostatic multi-needle recording head according to the present invention, which combines the sheet 1 strip-shaped electrode wire component and a circuit board. 9 is a front view of the same, FIG. 10 is a cross-sectional side view showing an example of the wire positioning body used in the above manufacturing process, and FIG. 11 is a diagram showing the steps after the process shown in FIG. 8. 12 is a side view showing the arrangement of the wire rods obtained in the step of FIG. 11(c), and FIG. 13 is a side view showing the arrangement form of the wire rods obtained in the step of FIG. 11(d). FIG. 14 is a plan view showing another example of a sheet-like electrode wire component applicable to the present invention, and FIG. 15 is a plan view showing an example of the electrode connection form in a conventional general electrostatic multi-needle recording head. The circuit diagram and FIG. 16 are plan views showing the arrangement of electrodes of a general electrostatic multi-needle recording head. 1... Sheet-like electrode wire component, 2... Wire rod, 20
...Circuit board, 21...Circuit pattern, 26...
・Wire positioning body. 1st lieutenant

Claims (1)

[Claims] 1. In an electrostatic multi-needle recording head having an electrostatic multi-needle electrode array in which a large number of electrodes are arranged in a row, the large number of electrodes are formed of wire rods, and the wire rods are formed of wire rods. It is configured as a sheet-like electrode wire component held at a predetermined pitch interval with a predetermined portion exposed for each number corresponding to the circuit pattern on the circuit board to be connected, and the sheet-like electrode wire component has one exposed portion. An electrostatic multi-needle recording head characterized in that: is fixed with resin to form a recording section of the head, and the other exposed portion is connected to a predetermined circuit pattern on the circuit board. 2. When the electrode is composed of N electrodes x M sets of electrode rows, the number of wires in one sheet-like electrode wire component is N, an integral multiple of N, or an integral fraction of N. electrostatic multi-needle recording head. 3. Claim 2, wherein the plurality of sheet-shaped electrode wire components are connected to the surfaces of a plurality of circuit boards, and the exposed portions of one of the wires of the sheet-shaped electrode wire components connected to the circuit board surface are arranged in a straight line. The electrostatic multi-needle recording head described. 4. In a method for manufacturing an electrostatic multi-needle recording head having an electrostatic multi-needle electrode array formed by arranging N electrodes x M sets of electrodes in a row, the wire rod is A sheet-shaped electrode wire component is made by holding each wire at a predetermined pitch with a predetermined part exposed, and one exposed part of the predetermined number of sheet-shaped wire parts is positioned and held by a wire positioning body. The wires are arranged at a predetermined arrangement pitch, each wire at the other exposed location is connected to a predetermined circuit pattern on the circuit board, and one of the exposed locations is fixed with resin and connected to the recording section of the head. A method of manufacturing an electrostatic multi-needle recording head, characterized by: