JP2568479Y2 - Electrostatic recording head - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrostatic recording head used for a facsimile or the like, and more particularly to an improvement in an electrostatic recording head using a multi-needle electrode and a control electrode.

[0002]

2. Description of the Related Art FIG. 3 shows a structure of an electrostatic recording head which has been frequently used in the past, and FIG. 4 shows an outline of a manufacturing method thereof. 3, reference numeral 1 denotes a needle electrode made of a nib (Nib) wire, reference numeral 2 denotes a control electrode, reference numeral 3 denotes a lead wire, and reference numeral 4 denotes a casting resin. The electrostatic recording head having this configuration is manufactured by the method shown in FIG. can get. That is, two molds 5, 5 in which the control electrode 2 is embedded and fixed are abutted so as to sandwich the needle electrode 1, a resin is poured into the mold by a resin injection machine 6, and after removing the mold, the head surface is polished. Products.

[0003]

The electrostatic recording head having the above configuration has the following problems. (1) It is difficult to obtain the positional accuracy of the control electrode due to misalignment due to resin shrinkage or mold alignment error during casting. (2) Since the amount of the casting resin is large, it is difficult to obtain dimensional accuracy of the needle electrode due to curing shrinkage and the like. (3) When the control electrode is fixed to a casting mold and insert-molded, the polishing amount on the head surface increases. (4) It is difficult to hold the lead wire of the control electrode.

[0004]

The purpose of the present invention is to easily obtain the positional accuracy and dimensional accuracy of the needle electrode and the control electrode, to enable a significant reduction in the amount of polishing on the head surface, and to hold the lead wire from the control electrode. It is an object of the present invention to provide an electrostatic recording head that can simplify the recording.

[0005]

SUMMARY OF THE INVENTION According to the present invention, there is provided a pair of side plate members each comprising a wiring board for fixing and holding a control electrode which is close to and facing a needle electrode. The gist of the present invention is that the electrode, the control electrode, and the side plate member are made of a casting resin that is integrated.

[0006]

In the electrostatic recording head having the above-described structure, the control electrode is fixed and held on the side plate, thereby obtaining positional accuracy. In addition, the use of the side plate can significantly reduce the amount of the casting resin used, and can provide dimensional accuracy. Furthermore, by using the side plate as the wiring board, the lead lines from the control electrodes are simplified.

[0007]

1 to 2 (a), (b) and (c) show an embodiment of the present invention. Figure 1 is a cross-sectional view of the fabricated electrostatic recording head, FIG. 2 (a), shows the (b), (c) the fabrication process.

In FIG. 1, reference numeral 10 denotes a needle electrode;
Is a control electrode which is close to and opposes the needle electrode, and each control electrode 11 is fixedly held by the side plate member A, and a casting resin such as an epoxy resin injected between both side plate members A, A. 12, the needle electrode 10, the control electrodes 11, 11 and the side plate members A, A are integrated. Reference numeral 13 denotes a lead of the control electrode.

Next, the manufacturing process of the electrostatic recording head having the above configuration will be described with reference to FIGS. 2 (a), 2 (b) and 2 (c). In this embodiment, as shown in FIG. 2A, the side plate member A uses an insulating plate 14 obtained by impregnating glass fibers with an epoxy resin and heat-curing the resin. A circuit board that is integrally formed during heat curing and used as a wiring board is used. The insulating plate 14 having the above-described configuration is not limited to the above as long as it is an insulating material.

The control electrode 11 is bonded to the surface of the printed wiring 15 on the insulating plate 14 and fixedly held. FIG.
Reference numeral 16 in (b) denotes solder or a conductive adhesive.

As shown in FIG. 2 (c), a pair of side plate members A, A, each holding and holding the control electrode 11, are fixed to the needle electrode 10 in the casting mold 17, as shown in FIG. It is set at a position that is close to and opposes, casting resin 12 is poured into the mold from the injection machine 6, and the needle electrode 1 is set.
0, the control electrode 11 and the side plate member A are integrated. Next, after demolding, the two-dot chain line 18 in FIG.
By polishing the head surface until this, the electrostatic recording head shown in FIG. 1 is obtained.

[0012]

[Effect of the invention] As described above, according to the invention,
With the configuration, the following effects can be obtained. (1) Since the control electrode is fixed and held to the side plate member by bonding, positional accuracy can be obtained. (2) By using the side plate member, the amount of the casting resin used is greatly reduced, so that the curing shrinkage and the like are reduced, and the dimensional accuracy is obtained. (3) In the case of insert molding, there is no portion to be embedded in the mold for fixing the control electrode, and the amount of polishing on the head surface can be greatly reduced. (4) By forming the side plate member as a printed wiring, the lead wire from the control electrode is printed and wired, so that it is simplified.

[Brief description of the drawings]

1 is a cross-sectional view of an electrostatic recording head of an embodiment of the present invention.

FIG. 2 is a manufacturing process diagram of the electrostatic recording head.

3 is a cross sectional view of a conventional electrostatic recording head.

FIG. 4 is a view showing a production of a conventional electrostatic recording head.

[Explanation of symbols]

 A side plate member 10 needle electrode 11 control electrode 12 casting resin 13 lead wire 14 insulating plate 15 printed wiring 16 adhesive 17 mold for casting

Claims (1)

(57) [Scope of request for utility model registration] 1. A pair of side plate members each comprising a wiring board for fixing and holding a control electrode which is close to and opposed to a needle electrode, and is injected between the two side plate members to be injected between the needle electrode, the control electrode and the side plate member. An electrostatic recording head, comprising: a casting resin that integrates the above.