JPS62187047A - Multi-needle electrode electrostatic recording head - Google Patents

Abstract

PURPOSE:To reduce significantly manhours for connection of electrodes divided into groups by providing a configuration in which a plurality of connection busses are arranged crossing each electrode on a plurality of arranged electrodes and are electrically connected to each plurality of electrodes divided into groups from a plurality of electrodes. CONSTITUTION:A hexagon cylinder is made of six substrates 1, and a coated insulative wire 2' which is the material for an electrode 2 is wound around the external circumference of the cylinder using an automatic wire winder to arrange a plurality of needle-like electrodes 2. In addition, the installation of the electrode 2 to a connection bus 3 through partial removal of an insulative coating can be performed by a laser machining device with a built-in digitally controlled positioner. Then a flexible printed circuit board with a connection bus 3 formed is overlapped and soldered on the electrode 2, thus electrically bonding each plurality of electrodes 2 divided in group to teach connection bus 3. This reduces manhours significantly.

Description

[Detailed Description of the Invention] [Summary] A long needle electrode electrostatic recording head for an electrostatic printer driven by a matrix drive method, in which connection busbars for connecting electrode groups are formed by printed wiring or the like. As a result, the number of man-hours required for group connections has been significantly shortened, reducing costs.

[Industrial application field]

The present invention relates to a long needle electrode electrostatic recording head for a pixel-type electrostatic printer, and particularly to a long needle electrode electrostatic recording head driven by a matrix drive method.

Electrostatic printers are broadly divided into three types: scanning type, pixel type, and character type.The scanning type uses a single-needle electrode electrostatic recording head, and scans one pixel at a time while reciprocating in the main scanning direction. In the case of a single character type, printing is performed character by character using the type matrix-shaped electrode for each character as an electrostatic recording head.

On the other hand, in the pixel type, a long needle electrode electrostatic recording head is used that has a plurality of needle electrodes arranged in a straight line corresponding to the total number of pixels in one scanning line length, and a desired electrode among them is selectively driven. By doing this, printing is performed pixel by pixel.

The pixel density of pixel-type electrostatic printers is generally 200 to 400 per inch.If this is 400, for example, 4096 electrodes would be used for 84 plates, but each Providing a driving gate is not a good idea when configuring a driving circuit.

For this reason, for example, in the case of a long needle electrode electrostatic recording head having 4096 electrodes, 6 electrodes are normally arranged in the order of arrangement.
The electrodes are divided into 64 groups of 4, and the 1st to 64th electrodes of each group are connected to a common terminal by number, thereby forming a 64 x 64 matrix, with one row and one column of the matrix. By selecting the following, one of the 4096 electrodes is selected and driven.

Therefore, in the case of a long needle electrode electrostatic recording head that employs such a driving method (referred to as a matrix driving method), for example, 64 electrodes (63 out of 4096 electrodes) are connected to a common terminal. However, it is desirable to reduce the number of man-hours required for this connection work as much as possible.

[Conventional technology]

FIG. 3 is a diagram illustrating the configuration of a conventional example according to the manufacturing process.

(a) shows a state in which a thin electrode wire 12 is wound around the outer periphery of a cylindrical winding jig ll provided with a spiral grooves at a predetermined pitch.

The winding jig 11 is provided with a groove 1a parallel to the generating line of the cylinder and a slit lb, and (b) shows that the thin wire 1 is formed at the groove 1a.
Apply the adhesive jig 13 having an L-shaped cross section from the outside of 2.

By pouring thermosetting resin into this part, thin wire 1
2 is molded and fixed.

The thin wire 12 is cut at the slit lb, and the winding jig 11
By removing the wire rod 12 from the wire rod and finishing the end face of the thin wire 12 with a molded part 14 made of thermosetting resin 1, long needle electrodes arranged in a blind pattern as shown in (C) are obtained.

(dl represents the state in which the m-wires 12 are divided into groups and soldered to a plurality of terminals T1 to Tn of the connector 15, and (dl represents the completed state with the cover 16 attached).

[Problem that the invention seeks to solve]

↓ In the long needle electrode electrostatic recording head configured as above,
It takes a very long time to manually classify the thin lines into groups, which is a major cause of hindering cost reduction.

Therefore, it is an object of the present invention to provide a long needle electrode electrostatic recording head that can significantly reduce the number of steps required for connecting groups of long needle electrodes.

[Means for solving problems]

FIG. 1 is a diagram showing the principle of the present invention.

Reference numeral 2 denotes a plurality of needle-shaped electrodes arranged in parallel on the substrate 1 with a predetermined pinch.

3 is electrically connected to each of the plurality of electrodes 2 arranged on the plurality of arranged electrodes z, intersecting with each electrode 2, and divided into a plurality of groups from the plurality of electrodes 2; represents multiple connection buses.

[Effect]

The long needle electrode electrostatic recording head according to the present invention can automate the arrangement of a plurality of needle-shaped electrodes 2, as well as the formation of connection busbars 3, the grouping of electrodes 2, and the electrical connection with each connection busbar 3. The connection can be automated, for example by using printed wiring techniques.

As a result, manufacturing man-hours can be significantly reduced.

〔Example〕

FIGS. 2(a) to 2(f) illustrate the structure of the embodiment according to the manufacturing process.

(al represents the structure of the substrate 1', and has a plurality of V-shaped grooves arranged in parallel at the same pitch as one pixel pinch.

This work is shown.

(As illustrated in C1, a hexagonal cylinder is made of six substrates 1', and an automatic winding machine is used to wind electrodes around the outer circumference of the hexagonal tube.
This can be carried out by winding an insulated wire 2' made of the same material.

Note that the insulating coating of the electrode 2 may be applied when fixing it to the substrate 1.

(dl indicates the work of partially removing the insulating coating of the electrode 2 to provide a connection part with the connection bus bar 3, and a laser processing machine or the like equipped with a numerically controlled positioning device can be used for this work.

Note that the portions of the electrodes 2 from which the insulation coating is removed, that is, the connection portions with the connection busbars are provided on one straight line for each group.

In (e), the flexible printed wiring board 4 on which the three connection busbars 3 are formed is stacked on top of the electrodes 2 in the state of (d) and soldered to each other, each of which is divided into groups. It is an explanatory view of the work of electrically connecting the electrodes 2 to each connection bus bar 3, and the soldering is performed by a remelting method.

In this way, the grouping of the electrodes 2 and the connection busbars 3
After the connection with the recording medium is completed, if necessary, a reinforcing material 5 is attached to the surface facing the recording medium, and then the end surface is finished.

(As shown in fl, each connection bus bar 3 is connected to each terminal of the connector 6 to complete the product.

As another example, after applying electroless copper plating to the upper surface of the electrode 2 in the state (d) above, a photo-etching process consisting of photoresist coating, exposure, development, etching, etc. is used to divide the electrodes into predetermined groups. The connection bus bar 3 can also be formed by connecting the connection parts of each electrode 2 so that the connection part of each electrode 2 is connected.

〔Effect of the invention〕

As explained above, according to the present invention, most of the steps required for grouping and connecting electrodes can be automated, and as a result, the number of man-hours can be significantly shortened and manufacturing costs can be reduced.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the principle of the present invention. FIGS. 2(a) to 2(f) are explanatory views of the embodiment. FIGS. 3(a) to 3(e) are explanatory diagrams of conventional examples. In the figure. l・1' is the substrate, 2 is the electrode. 3 is the connection busbar, 4 is the printed wiring board.

Claims (2)

[Claims] (1) A plurality of needle-shaped electrodes (2) arranged in parallel at a predetermined pitch on the substrate (1), and arranged intersecting each electrode (2) on the arranged electrodes (2). A plurality of electrodes (2) are divided into a plurality of groups, and a plurality of connection busbars (3) are electrically connected to each of the plurality of electrodes (2). Long needle electrode electrostatic recording head. (2) The plurality of connection busbars (3) are formed on a common printed wiring board and are connected to the electrodes (2) by soldering.
1) The long needle electrode electrostatic recording head described in section 1).