JPS636869B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for connecting multi-needle electrodes for electrostatic recording used in facsimile machines, printers, and the like.

For example, facsimile machines and printers have
Electrostatic recording devices are used to record images on recording media. This electrostatic recording device has a recording electrode made up of a large number of extremely thin needle-like electrodes, and an auxiliary electrode that faces this electrode with a minute gap, which are placed close to each other with a recording medium such as electrostatic recording paper interposed therebetween. Alternatively, a recording head equipped with both a recording electrode and an auxiliary electrode is made to face the recording medium, and a voltage containing an information signal is applied between these recording electrodes and the auxiliary electrode to perform recording scanning, thereby recording a signal on the recording medium. After forming an electrostatic latent image on
This latent image is visualized to obtain an information image.

Referring to FIG. 1, an example of a recording electrode head will be explained.

On the head end surface 1a of the recording electrode head 1, the end surfaces of a large number of extremely thin needle-like electrodes 2 are exposed and arranged in one direction at minute pitches. A conductive wire 2a integral with the needle electrode 2 extends from the end surface opposite to the head end surface 1a. The needle electrodes 2 are provided in a staggered pattern or in multiple rows, for example, 2048 needles at a pitch of 8 electrodes/mm. The number and pitch of the electrodes 2 correspond to the linear density in a facsimile device or the like.

The conducting wire 2a is generally connected to an insulating substrate, such as a printed circuit board. This substrate is connected to a control circuit that applies a voltage containing an information signal to the recording electrodes. Therefore, the recording electrode head is connected to the control circuit via the insulating substrate.

That is, the 2048 conductive wires are necessarily connected to the insulating substrate, and an example of this connection method will be explained based on FIG. 2.

In FIG. 2, the conductor 2a of the recording electrode head 1
A predetermined number of the total number of wires are bundled together and connected to one through hole of the insulating substrate 3 by soldering, and this connection is made sequentially for each through hole. The through hole is connected to a terminal 5 via a common connection line 4. This terminal 5 is connected to the aforementioned control circuit via a connector or the like.

According to the connection method shown in FIG. 2, since the conductor wires are soldered to the through holes all at once, there is an advantage that the number of times of soldering can be reduced. However, the lengths of the plurality of conductive wires connected to one through hole are some short and some extremely long, which causes a problem of stray capacitance and greatly affects electrostatic recording performance.

Next, referring to FIG. 3, another example of a method for connecting multi-needle electrodes will be described. For example, 2048 needle-like electrodes are embedded in the recording electrode head 6. The 2048 needle-shaped electrode conductors are divided into 32 groups, each group consisting of 64 wires. One group consisting of the first to 64th conducting wires is connected to each of the first to 64th wires of the common tangent 8 of the insulating substrate 7 as shown in the figure. Then, from the 65th to the 128th
The two groups of conducting wires up to the 64th line are similarly connected to the 1st to 64th lines of the common tangent line 8 as shown in the figure. Then, all the conductive wires are connected to the insulating substrate 7 by repeating these connections sequentially for each group. In addition, in FIG. 3, the reference numeral 9 indicates a terminal of a common tangent.

According to the connection method shown in Fig. 3, it is necessary to take out adjacent electrode wires one by one with extremely small pitches (8 wires/mm) and solder them, and the number of times is 1. 64 times in the group, convenient in all groups
It will be 2048 times. To improve recording density,
A large number of electrodes must be prepared, and their diameters must also be made smaller.

Therefore, the wiring work becomes more difficult, and the soldering work not only has to be performed more often but also becomes extremely complicated.

In particular, if a metal that is not easy to solder is used as the electrode, it cannot be connected to the insulating substrate. Therefore, welding using a laser beam may be considered, but such equipment is expensive and has poor workability, which has the drawback of increasing the cost of the recording electrode head.

The present invention has been made in view of the above, and includes:
It is an object of the present invention to provide a multi-needle electrode connection method that can extremely easily connect needle-shaped electrodes, so-called conductive wires, which cannot be easily connected by soldering, welding, etc., to an insulating substrate.

The object of the present invention is to divide the conductive wires of a large number of needle-shaped electrodes arranged in a row on the electrode head into n groups, with m wires forming one group, and to divide the conductive wires of one of the groups into n groups.
Place adjacent conductive wires on a first insulating substrate at intervals, and stack a second insulating substrate on top of the first insulating substrate,
A conductive resin that will become a basic connection wire is filled into a hole formed in the second insulating substrate that crosses a group of m conductive wires and exposes a part of the conductive wire, and then this is heated. By curing, the m conductors of one group are electrically connected to each other, and by repeating this operation n times, all the conductors (m×n
This is achieved by a multi-needle electrode connection method characterized in that the wires (1) are connected to n common connection lines.

According to the present invention, a large number of conducting wires is divided into n groups of m wires, one group of conducting wires is sandwiched between a pair of insulating substrates, and the conducting wires are inserted into holes provided in one of the substrates. Since conductive resin is filled and cured by heating to form one group of m common connection wires, even conductive wires that are difficult to solder or weld can be connected to the insulating substrate extremely easily.

Furthermore, compared to the conventional method in which the number of soldering operations is the same as the number of all the conductive wires, the number of times of heating corresponding to this is n times, and the workability of connecting the conductive wires is greatly improved.

Furthermore, when carrying out the present invention, if a semi-cured resin layer is provided on the joint surface of at least one of the insulating substrates to be superposed on each other and a group of conductive wires is sandwiched, the conductive wires and each insulating substrate are substantially separated. At the same time, this resin layer fills in the space between adjacent conductive wires, so that the conductive resin serving as the common connection wire does not leak from the hole when heated.

Hereinafter, the present invention will be explained in detail based on the drawings.

FIG. 4 shows a still unfinished electrode head. A large number of, for example, 2048 conductive wires 20a and 20b extend from both end surfaces of the electrode support 10 in which a large number of needle-like electrodes are arranged. In the illustrated example, the 2048 conductive wires 20a are divided into eight groups each having 256 conductive wires. Each group is then attached to eight identification tapes T ₁ to T ₈ . Note that this identification tape may be a color-coded adhesive tape.

One group is identified by the identification tape T, and the structure of this group will be explained. For example, the conductive wires attached to the identification tape T ₁ are the 1st, 9th, 17th, 2041st, etc. of the series of conductive wires.
There are a total of 256 conductors numbered on the identification tape T ₂ .
A total of 256 conductor wires, No. 2, No. 10, No. 18, No. 2042, are pasted.

On the other hand, the conducting wires 20b are also affixed to eight identification tapes and divided into eight groups in the same manner as described above. Thereafter, the electrode support 10 is cut along line L and the cut surfaces are polished to obtain two electrode heads.

In the present invention, the conductive wires divided into groups may be connected to the common connection line after the electrode support 10 is divided into two, but in the following explanation, the conductive wires are connected before the support 10 is divided into two. Give an example. That is, this is an explanation of an example in which the conductor wires of two electrode heads are connected at the same time.

In FIG. 5, reference numeral 11 indicates a first insulating substrate made of an insulator. First insulating substrate 1
1 is formed with a rectangular window hole 11a that is large enough for the electrode support 10 to enter. This window hole 11
At both ends of the long side portions 11b and 11c forming a, a second insulating substrate 12, which is superposed thereon, is provided.
A positioning hole for positioning 13 is formed. The second insulating substrates 12, 13 have substantially the same width and length as the long side portions 11b, 11c, and have holes 12a, 12b formed in the longitudinal direction. Semi-hardened resin layers 12b and 13b are formed on the surfaces of both substrates 12 and 13 to be bonded to the first substrate 11 so as to frame the holes 12a and 13a.

On the other hand, as shown in FIG. 4, it is assumed that the needle-like electrodes of the electrode head material into which the conducting wires are grouped, in other words, the conducting wires are not subjected to insulation coating treatment.
The needle electrode may be made of a material that is difficult to solder or weld, such as stainless steel or tungsten.

Then, as shown in FIG. 6, the electrode support 10 is inserted into the window hole 11a of the first insulating substrate 11, and among the conductive wires 20a and 20b, the eighth group of conductive wires 20a ₈ and 20b ₈ are connected to the substrate. 11 long side portion 11b, 1
Place it on 1c. At this time, it is important to maintain a distance between adjacent conducting wires so that they do not come into contact with each other. Next, the second insulating substrates 12 and 13 are stacked on the long side portions 11b and 11c, and the eighth group of conducting wires 20a ₈ and 20b ₈ are sandwiched therebetween. The first and second insulating substrates are positioned relative to each other by inserting positioning pins of a support mechanism (not shown) into positioning holes drilled in each.

As shown in FIG. 7, the first and second insulating substrates 11, 12, and 13 holding the conductive wires 20a ₈ and 20b ₈ are pressed together and heated to bond them together. Due to this pressurization and heating, the semi-cured resin layers 12b and 13b located on the bonding surfaces of both substrates are melted and the two substrates are bonded to each other.At this time, the conductive wire _20b8 is As only one side is shown in , it is buried in the resin layer 13b. When both substrates and conductive wires are integrated, a portion 20 of all the conductive wires is inserted into the holes 12a and 13a of the second insulating substrates 12 and 13.
This means that A and 20B are exposed.

Next, with both substrates pressed, as shown in FIG.
The conductive resin 14 is injected and filled into 13a and heated as shown by the arrow. When the conductive resin 14 and the semi-cured resins 12b and 13b are cured, the conductive resin 14 causes the eighth
A common connection line for the group of conductors is now formed.

That is, the conductive resin 14 injected into the holes 12a and 13a surrounds the part 20B of the conductive wire that has been exposed until now, as only one of them is shown in FIG. 10, and is heated and hardened. To that end, the 8th
The 256 conductive wires consisting of No. 8, No. 16 (see Figure 4), No. 2046, which make up the group, are all connected to the conductive resin 14, which is one common connection wire. Become.

As mentioned above, the recording head material 30 shown in FIG.
The conductors are divided into eight groups. Therefore, when forming a common connection line for one group, the other groups are moved upward _, for example, so as not to interfere with the connection of the conductors, as shown in _FIG . Leave it in place.

This completes the connection of the eighth group of conductors, but there are still seven groups left to connect. Therefore,
First and second insulating substrates 1 integrated with each other
1, 12, and 13 are cut at four locations indicated by reference numerals a in FIG. 6, and the connected conductive wires are bent and evacuated as shown in FIG.

FIG. 11 shows a state in which the formation of the common connection line for the eighth group of conductive wires has been completed and the seventh group of conductive wires is being connected. At this time, the other groups of unconnected conductive wires are retracted upward, as represented by the sixth group of conductive wires 20a ₆ and 20b ₆ .

Regarding the connection of the 7th group of conductors, please refer to the 8th group mentioned above.
Since it is exactly the same as that of the group, its explanation will be omitted as it will be redundant.

Hereinafter, if a common connection line is formed for each of the remaining groups, the conducting wires of each group will be connected to each other by the respective common connection lines.

After all the conductor wires have been connected, the recording head material 30 is cut along the line L shown in FIG.
one recording head 300 (only one is shown in FIG. 14). By the way, the distances between the electrode support 10 and the eight common connection lines may be the same or different from each other.

For example, as the first insulating substrate, the short side x (the fifth
If eight groups of conductive wires (see figure) are prepared and the eight groups of conductive wires are connected, a recording head with approximately equal distances between the electrode support 10 and the common connection line 140 will be created, as shown in FIG. is obtained. Furthermore, if a substrate in which x is different for each group is used as the first insulating substrate, the first group 141 and the second group shown in FIG.
Like the group 142 and the third group 143, the electrode support 1
Recording heads having different distances from each common connection line are obtained.

For example, when the recording head material 30 shown in FIG. 12 is cut along line L, two recording heads are obtained. The recording head thus obtained is shown in FIG. In addition, in Fig. 14, the first
Only the common connection line 141 of the conductors of the group and the common connection line 148 of the conductors of the eighth group are shown.

The conductive wire of the recording head 300 shown in FIG. 14 is not coated with insulation. Therefore, when all the conductive wires have been connected, or when they are cut at the line L to form the recording head, the conductive wires are insulated by a known means.

Further, as shown in FIG. 14, after the conductive wires of each group have been connected and have been insulated, the conductive wires of the first to eighth groups are connected to the electrode support 10 along with their respective common connection lines. It is hardened with an appropriate insulating resin so that it is virtually integrated with the
At this time, it is advantageous in terms of electrostatic recording performance to arrange a shield plate for stray capacitance between each group of conducting wires.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing an example of an electrode head, Figure 2 is a perspective view showing an example of an electrode head;
3 and 3 are front views showing different examples of the conventional multi-needle electrode connection method, and FIG. 4 is a perspective view of the recording head material in which the conductive wires are divided into eight groups in carrying out the present invention. FIG. 5 is a perspective view showing the first and second insulating substrates used in implementing the present invention, FIG. 6 is a perspective view showing the state in which the present invention is implemented, FIGS. 7, 8, and 11 9 is a sectional view taken along the - line in FIG. 7, FIG. 10 is a sectional view taken along the - line in FIG. 8, and FIG.
2 and 13 are side views showing different examples of electrode head materials obtained according to the present invention, and FIG.
FIG. 4 is a perspective view showing an electrode head obtained from the electrode head material shown in FIG. 12. 10... Electrode support, 11... First insulating substrate, 12, 13... Second insulating substrate, 12a, 1
3a...hole, 12b, 13b...semi-cured resin layer,
14... Conductive resin, 20a, 20b... Conductive wire,
20a ₆ , 20b ₆ ... 6th group conductor, 20a ₇ , 20
b ₇ ... 7th group conductor wire, 20a ₈ , 20b ₈ ... 8th group conductor wire, T ... Identification tape, 141 ... 1st group common connection line, 148 ... 8th group common connection line ,3
00... Recording head.

Claims (1)

[Scope of Claims] 1. The conductor wires of a large number of needle-like electrodes arranged in a row on the electrode head are divided into n groups with m wires as one group, and the conductor wires of one group are divided into adjacent conductor wires. A second insulating substrate is placed on the first insulating substrate at intervals, and a second insulating substrate is stacked on top of the first insulating substrate. In addition, conductive resin that becomes a common connection line is filled into the hole that exposes a part of the conductor wires, and by heating and curing it, the m conductor wires are electrically connected to each other, and this operation is repeated n times. A multi-needle electrode connection method characterized by connecting all conductive wires to n common connection wires by threading. 2. A semi-cured resin layer is provided on the bonding surface of at least one of the first insulating substrate and the second insulating substrate, and the conductive wire is connected to both substrates. 2. The multi-needle electrode connection method according to claim 1, wherein the three parts are substantially integrated when clamped.