JPH04211969A - Manufacture of control grid for image forming device - Google Patents

Abstract

PURPOSE: To realize substantially collective bonding in units of column direction or row direction by temporarily bonding the ends of a wire electrode and a lead wire using a tape-like film and then bonding them electrically. CONSTITUTION: A wire electrode 10 has three layer structure of an aluminum or copper core wire 10a, an insulation layer 19b surrounding the core wire 10a, and a first outer adhesive layer 10c which can be bonded externally by physical addition. After the electrodes 10 are arranged, the electrode group is bonded temporarily on the end side through a conductive adhesive tape 20 previously bonded with the end side of each lead wire 21. It is then pasted such that the end side part temporarily bonded by the tape 22 is concealed and the lead wire 21 is located constantly between electrodes 10A1 -1, 10A2 and the tape parts 2O-22 are hot pressed. Adhesive at the surface layer part of the wire electrode 10A fuses to bond the end side part and the core wire is bonded to the conductive tape and bonded electrically.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is characterized by arranging a toner carrier and a back electrode across a control grid that forms toner holes corresponding to image information by controlling energization. An image forming apparatus configured to be able to transfer toner that has passed through the toner hole onto the recording material while moving the recording material along the electrode surface,
In particular, manufacture of a control grid for an image forming apparatus, which is formed by electrically connecting the ends of a pair of adjacent wire electrodes of a large number of wire electrodes extending substantially parallel to each other and connecting them to corresponding lead wires. Regarding the method.

[Prior Art] Conventionally, an image is created in which toner carried on a toner carrier is directly transferred onto a recording material in a dot pattern corresponding to image information without using a photosensitive drum that functions as a latent image carrier. The forming apparatus is publicly known (Sweden Patent Application No. 8704883, etc.), and the configuration of this apparatus will be briefly explained based on the basic configuration diagram shown in FIG. Sleeping toner carrier,
2 is a back electrode 2 disposed opposite to the toner carrier 1;
A matrix-like control grid 3 is arranged between the two, and by controlling the control grid 3 to be energized in the X-Y axis direction, the developing electric field acting on the holes 3a between the matrices is selected in accordance with the image information. The recording paper 4 arranged on the surface of the back electrode 2
Toner corresponding to the image information can be transferred from the toner carrier 1 through the toner passage hole 3a in the control grid 3 above.

Further, the control grid 3 is arranged in the longitudinal direction (as shown in FIG. 9).
A matrix shape consisting of a plurality of X-axis lines X1, X2... extending in A group of conducting wires is sandwiched between front and back insulating thin films, and a through hole is formed at a portion sandwiched between the Y axis and the X axis of each pair to form a toner through hole 3a.
Formed by PC.

The control grid is controlled by sequentially energizing the X1, X2 lines . . . with a time difference as shown in FIG. As a result, the toner pattern becomes one row, and as a result, it is possible to form a dense dot pattern without making the Y-axis line width particularly dense.

"Technical Problems to be Solved by the Invention" Now, in order to improve the accuracy of the matrix-like axis spacing, the homogeneity of tension, and the insulation properties of the control grid in the device,
Generally, FPC is manufactured using FPC, but FPC is expensive and requires drilling the toner holes with precise positional accuracy at each axis interval in the matrix, making the drilling process extremely complicated. .

In order to eliminate these drawbacks, we are currently considering a method of manufacturing a control grid by arranging and fixing wire electrodes in a matrix, at least conductive wires covered with an insulating layer. As shown, after a large number of wire electrodes are extended in parallel in the X-axis direction and the Y-axis direction and arranged and bonded in a matrix shape, or before the arrangement and bonding is performed, the ends of a pair of adjacent wire electrodes are connected to each other. Since the wire electrodes are electrically connected to form a closed loop and connected to respective lead wires at the joints to form a control grid, in other words, the process of joining the ends of the wire electrode pairs and the lead wires is difficult. It is necessary to perform twice the number of rows and columns of toner holes (on both ends). For example, when making a grid of 640 dots, it is necessary to perform 8 x 2 times (row direction) + 80 x 2 times (column direction). , it is necessary to perform a bonding process with the lead wire, which makes the manufacturing process extremely complicated.

Therefore, the present invention makes it possible to substantially collectively perform the bonding process in the column direction or the row direction as one unit without performing the bonding process for each individual electrode pair, and to easily and reliably perform the process without causing erroneous connections. The purpose of this invention is to provide a control grid terminal processing method that enables the following.

"Technical Means for Solving the Problem" In order to achieve the technical problem, the present invention aims to, for example, arrange and fix a large number of wire electrodes in a matrix shape in the X-Y axis direction, and then extend them in parallel. X-axis direction or Y
After temporarily fixing the wire electrode end groups and the lead wire end groups in each axial direction via a tape-like film, electrical connection between the wire electrode ends and the lead wire ends is performed using brazing, adhesive tape, or the like. It is characterized by this.

In this case, since the wire electrode and the lead wire are generally coated with insulation, it is necessary to remove the insulation portion before making the electrical connection.

Even in such a case, since the wire electrode end and the lead-out wire end are temporarily fixed using a tape-like film, as described in claim 2), with the both members temporarily fixed, the temporary After removing the insulating coating layer by applying pressing force, thermal force, or other physical force to the fixed portion, electrical connection between the wire electrode end and the lead wire end may be performed.

Therefore, it is preferable that the tape-like film can withstand the pressing force, thermal force, and other physical forces.

Now, in the above invention, a closed loop cannot be formed unless each pair of wire electrodes and one lead wire are individually electrically connected, but this makes the terminal processing complicated.

Therefore, in the invention described in claim 3), X or Y
After the ends of the wire electrodes extending in the axial direction and the ends of the lead wires are joined side by side at once, the ends of the adjacent electrodes that are not joined to the lead wires, in other words, the ends of the adjacent closed loops of the adjacent closed loops are cut with a knife or other tool. Complications in the terminal processing can be avoided by using a cutting jig to separate the parts and release the electrical connection.

In this case, a flat cable group in which a pair of wire electrodes are integrally connected via an insulated dummy wire is used, and after temporarily fixing the ends of the cable group and the ends of the lead wire group using a tape-like film, Even if the ends of the opposing wire electrodes of the adjacent flat cables are electrically connected to each other and the end of the lead wire, and finally the dummy wire is removed by tearing, the adjacent electrode ends of the closed loop are connected. It is possible to easily separate the terminals and release the electrical connection, and this method also avoids complicating the terminal processing.

Further, after temporarily fixing the wire electrode end and the lead wire end while placing an insulating tape-like film so as to stitch the electrode ends of each pair of wire electrodes, the electrical connection between the wire electrode end and the lead wire end is By performing the bonding, the separation operation described above becomes unnecessary.

``Example'' Hereinafter, an example of the present invention will be described in detail based on the drawings. Unless otherwise stated, the scope of the present invention is not intended to be limited thereto and is merely an illustrative example.

FIG. 1 shows a wire electrode 10 used in an embodiment of the present invention, in which an insulating layer 10b is surrounded by a core wire 10a made of aluminum or copper wire.
Furthermore, it has a three-layer structure in which the outer layer is coated with a first adhesive layer 10c.

In this case, the first adhesive layer 10c is preferably a hot-melt adhesive, but is not particularly limited as long as it can be joined by physical application from the outside.

Next, a method of manufacturing a control grid using the wire electrode 10 will be explained based on FIG. 2.

First, as shown in FIG. 2(a), the wire electrode 10
A large number of pieces A are stretched in parallel at the spacing shown below.

That is, the pitch interval is the same as that of the electrode 10A1 for forming a closed loop.
- wire electrodes 10A2-10A with a width slightly larger than the diameter of the through hole 20 and located back-to-back;
The space 1' is set to have a narrower width than the above-mentioned space.

That is, for example, when the wire electrode 10A has a diameter of 0.2φ, the diameter is 0.6 mm-0.2 mm-0.6 mm-0.2 m.
It is preferable to arrange them at a pitch interval of about m.

Then, as shown in FIG. 2(b), after the arrangement, the ends of the electrode groups are temporarily joined using conductive adhesive tape 20, which has been joined at predetermined arrangement intervals to the ends of each lead wire 21. do.

It should be noted that an insulated wire is used for the lead wire 21, and the arrangement interval is equal to that of the electrodes 10A1-10A2 for forming a closed loop.
For example, 0 so that the leader line 21 is always located between
．． It is best to set them at 8mm intervals.

Next, as shown in FIG. 2(c), use another conductive adhesive tape 2.
After affixing the tape portions 20-22 so as to hide the end portions temporarily joined in step 2, heat and pressing force are applied to the tape portions 20-22.

As a result, as shown in FIG. 2(d), the wire electrode 10A
The adhesive on the surface layer of the wire melts and the final bonding of the end portion is performed, and at the same time, the insulating layer 10b/21b of the wire electrode 10A and the lead wire 21 portion is ruptured by the pressing force, exposing the core wire 10a/21a. At the same time, the core wire is adhered to the conductive tape, and an electrical connection is established.

Next, as shown in FIG. 2(e), wire electrodes 10A2-10A1 are placed on the backs of the joined tape parts.
' Insert the knife 23 into the gap 24 and cut.

Next, the other end in the X-axis direction is similarly terminal-treated to form a closed loop in the X-axis direction, while the wire electrode 10B in the Y-axis direction is
Similar processing is also performed in , forming a closed loop in the X-axis direction.

Note that FIG. 3 shows another embodiment in which an FPC 30 with a slitter is used for the lead line, and as shown in (a), the end side of the FPC 30 on which the lead line 31 is printed is widened to the same width as the group of wire electrodes 10A. At the same time, a conductive tape-like film 32 that is electrically connected to the lead wire 31 is deposited on the widened end surface, and further wire electrodes 10A2-10A are placed back to back.
Insert a slit 33 at a position interval corresponding to 1',
Electrically cut off.

Next, as shown in (b), the end sides of the electrode group 10A are joined so that the electrodes 10A1 to 10A2 for forming a closed loop are arranged between the respective slits 33 in the same manner as in the above embodiment, and then the tape A pressing force is applied to the end side of the electrode group together with the 32 portion, the insulating layer 10b of the wire electrode 10A is ruptured to expose the core wire 10a, and the core wire 10a is joined to the tape 32 portion.

FIG. 4 shows another embodiment using an insulating film 40 (a
), using an insulating tape film 40 to which the end sides of each lead wire 41 are bonded in advance at a predetermined arrangement interval, the pairs of electrodes 10A1-10A2 for forming the closed loop are always alternately positioned on opposite sides. After the film is sewn and bonded between the wire electrodes 10A2-10A1 located back to back, as shown in FIG.
Conductive part 42a and insulating part 4 according to the A1-10A2 pair spacing.
After adhering the adhesive tape 42 having the adhesive tapes 2b arranged alternately in the longitudinal direction from both sides, heat and pressing force are applied to the tape 42 portion.

As a result, similar to the embodiment described above, the wire electrode 10A and the insulating layer 10b/41 of the lead wire 41 portion are
b is ruptured to expose the core wire 10a/41a, and
The core wire 10a/41a is the conductive part 42a of the tape 42.
It adheres to the parts and makes an electrical connection.

Figure 5 shows an embodiment of the present invention using a flat cable.
The flat cable 50 has a dummy wire 5 for maintaining a distance between a pair of wire electrodes 501 and 502 that are integrally extended in parallel.
It is formed with 00 interposed.

In this case, the wire electrodes 501 and 502 have a two-layer structure in which a core wire 50a made of aluminum or copper wire is covered with an insulating layer 30, while the dummy wire 500 is made of the same material as the wire electrodes 501 and 502. Although wire electrodes 501 and 502 may be used, it is preferable to use a different type of insulating material that has a higher tensile strength than wire electrodes 501 and 502.

Next, to explain the terminal processing method using the flat cables in FIG. 6, the flat cables are formed by forming a large number of flat cables 50 with a gap slightly larger than the toner hole diameter, and making the dummy wires 500 slightly longer. After arranging the flat cable in parallel, a tape-shaped insulating film 52 with a lead wire 51 arranged thereon is adhered to the end side of the flat cable, and then a conductive adhesive tape 53 is pasted from the opposite side of the insulating film 52. Then, by tearing the dummy wire 500 toward the conductive film 53 and removing it, the adjacent electrodes of the conductive film 53 are cut, and a closed loop similar to that described above is formed.

The electrodes forming a closed loop as described above are shown in Figure 7 (a).
), the tension generating rods 11 and 12 are arranged in a matrix on the left, right, upper and lower sides so as to surround the rectangular surrounding space that forms the control grid 3, and then the intersections 15 are made into point joints. The temporarily bonded matrix wire array 1 is then placed in a bonding tank 16 consisting of a flat, wide-area concave tank made of an inert material such as polyethylene or fluororesin.
0A/10B are stretched horizontally, and then the second adhesive 30 is poured from above. Next, as shown in (b), the cover body 18 is placed on the top of the bonding tank 16, and the bottom is A suction port 19 connected to a suction pump 22 via a second adhesive storage tank 21 is attached to the opening 16A from which the moving plate 17 has been removed, and the liquid adhesive 30 layer is heated to a predetermined viscosity or higher during curing. When this occurs, the pump 22 sucks the area corresponding to the control grid forming area.

As a result, as shown in (c), the portion of the adhesive 30 that is in the middle of curing that corresponds to the toner passage hole 3a is removed by the suction, but at this time, the adhesive 30 is Due to the high viscosity, the adhesive 30 remains in the area around the wire and in the narrow width area where the dummy line 500 has been removed due to surface tension, and the adhesive 30 is removed in a circular shape only in the toner hole 3a area. However, other parts will be held by surface tension.

After the treatment, the adhesive is cured to complete the control grid shown in FIG. 7(d).

Note that the control grid may be formed beforehand.

"Effects" As described above, according to the present invention, the bonding process is not performed for each electrode pair, and the column direction or row direction is
The practical effect is extremely high because it is possible to substantially perform collective connection processing as a unit, and the terminal processing can be performed simply and reliably without causing erroneous connections.

It has various effects such as

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the wire electrode used in the present invention, Figure 2 is a cross-sectional view of the wire electrode used in the present invention;
3A and 3B are operational diagrams showing a method for terminal treatment of a control grid formed using the wire electrodes, and FIG. 3 shows a control grid completed by this manufacturing process. FIG. 4 is a flat cable used in the present invention, FIG. 5 is an operational view showing a method for terminal treatment of a control grid formed using the flat cable, and FIG. An operational diagram showing a process of manufacturing a control grid and a control grid completed by the manufacturing process are shown. FIGS. 8 and 9 are a schematic configuration diagram showing the basic invention to which the present invention is applied, and an action diagram showing the energization control state thereof.

Claims (5)

[Claims] Claim 1: A large number of wire electrodes extending substantially in parallel,
In a control grid for an image forming apparatus formed by electrically connecting a pair of adjacent wire electrode ends to each other and connecting each corresponding lead wire, the wire electrode ends and the lead wire ends are connected using a tape-like film. A method for manufacturing a control grid for an image forming apparatus, characterized in that the wire electrode end and the lead wire end are electrically connected and terminal processing is performed after the wire electrode end and the lead wire end are temporarily fixed. 2. While the wire electrode end and the lead wire end are temporarily fixed using a tape-like film while still being insulated, pressing force, force, or other physical force is applied to the temporarily fixed portion to insulate the wire. The method for manufacturing a control grid according to claim 1), characterized in that after removing the coating layer, electrical connection is made between the wire electrode end and the lead-out wire end. 3. After the wire electrode end and the lead wire end are temporarily fixed using a tape-like film and the temporarily fixed portions are integrally electrically connected, a gap between adjacent electrode ends that are not joined to the lead wire is formed. The terminal processing method according to claim 1), wherein the electrical connection is released by separating the terminals from each other. 4. After temporarily fixing the wire electrode end and the lead wire end while arranging an insulating tape-like film so as to stitch the electrode ends of each pair of wire electrodes, the wire electrode end and the lead wire end are temporarily fixed. The method for manufacturing a control grid according to claim 1), characterized in that electrical connection between the control grid and the control grid is performed. 5. After temporarily fixing the ends of a flat cable group in which a pair of wire electrodes are integrally connected via an insulated dummy wire and the ends of the lead wire group using a tape-like film,
The method for manufacturing a control grid according to claim 1, characterized in that electrical connection is performed between the end sides of opposing wire electrodes and the end of the lead wire of the adjacent flat cables.