JPH02266941A - Connecting method of liquid jet recording head - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] C industrial use! ? 1. The present invention relates to a liquid jet recording head connection method for electrically connecting the liquid jet recording head to an apparatus main body.

[Prior Art] Conventionally, an electrical connection between a liquid jet recording head and a liquid jet recording apparatus main body is provided on an electrical wiring board 2 of the recording head, as shown in the steps shown in FIGS. 4A to 4B, for example. Embossed electrodes 8 are used to connect the electrodes 3 and the electrodes of flexible printed board (hereinafter referred to as FPC) 5 (located on the back side of FPC 5 in Fig. 4C) for electrically connecting the main body of the device and the head. This is accomplished by aligning and overlapping the crimping fittings 7 and tightening the crimping fittings 7 with screws 10 via the crimping rubber 6. In such a liquid jet recording device, F
An energy generator, such as an electrothermal converter that generates thermal energy, is used to eject the recording liquid provided in the head element 13 via the electrodes of the PC 5 and the electrodes 3 provided in the electric wiring board 2. A signal is sent to and recorded.

In addition, the code to is the holder of the head element 13, and the code 1
1 is a supply pipe that supplies recording liquid to the head element 13;
Reference numeral 12 denotes a holding fitting for the head element 13.

In such a liquid jet recording head, while it is being used, the recording liquid may enter the crimping part of the FPC, and since the recording liquid is usually conductive, a short circuit occurs between the electrodes. Something happened.

In particular, when the recording liquid that has entered the crimping part dries and becomes a solid layer, the insulation properties may be reduced and a large current may flow between adjacent electrodes, which may cause a failure of the head. For this reason, after the FPC is crimped, a sealing agent 4 made of an insulating resin is applied around the crimped part to perform sealing and insulation, as shown in Figure 3@4C.

[Problem that the invention seeks to solve] However,
In the above method, the sealant 4 is applied after the FPC is crimped in the state shown in Figure 14B, so the application area is the entire circumference of the crimping part, the front and back of the screw, the entire periphery of the crimping fitting, etc. where there is a possibility that the recording liquid may intrude. There were problems such as the need for a certain amount of cutting, which resulted in long working hours, a large amount of sealant, and the inability to proceed to the next process until the sealant had hardened. Furthermore, it is difficult to completely prevent the recording liquid from entering. For example, the recording liquid may enter through the gap between the base plate 1 and the electrical wiring board 2 and reach the electrodes through the screw holes 9, causing a short circuit. There was also a problem.

[Means for Solving the Problems] The present invention solves the above-mentioned conventional problems.

The present invention provides a method for electrically connecting a liquid jet recording head to an apparatus main body, including the step of providing a sealant on and/or around the electrodes of the liquid jet recording head. , a step of electrically connecting an electrode of a member for sending a signal from the device main body to the liquid jet recording head and an electrode of the liquid jet recording head. It's a method.

[Embodiment Example] FIGS. 1A to 1C are top process views showing a first embodiment example of the present invention. In addition, FIGS. 2A and 2B are
FIG. 1 is a perspective process diagram showing a first embodiment of the present invention. In these drawings, the same members as in FIGS. 4A to 4C are designated by the same reference numerals, and their explanations will be omitted.

FIG. 1A is a top view showing the state of the recording head before the FPC 5 is pressed. After applying a small amount of sealant 4 to the FPC 5, the FPC 5 is crimped with a crimping fitting 7 via a crimping rubber 6, as shown in FIGS. 1C and 2B. By crimping the FPC 5, the sealant 4 spreads uniformly over the crimping surface. Electric wiring board 2 and FPC 5
There is a film of sealant 4 between the two electrodes, but the gold plating of the electrodes forms a slight protrusion from the surface to be plated, so the picture electrodes do not electrically contact each other. ing.

According to this embodiment, it is possible to completely prevent the recording liquid from entering the electrode pressure-bonding portion with a small amount of sealant by a simple operation.

Furthermore, it is possible to proceed to the next operation without waiting for the sealant 4 to harden.

FIGS. 3A to 3C are top process views showing a second embodiment of the present invention. This embodiment differs from the above-described first embodiment in that, as shown in FIG. 3B, a sealant 4 is applied around the electrode 3 before crimping. According to this method, since no sealant 4 remains between the crimping surfaces after crimping, more reliable electrical connection between the electrodes is possible. or,
Since the sealant 4 is not exposed to the outside after the FPC 5 is crimped, there is no need to wait for the sealant 4 to harden, as in the first embodiment, and the process can proceed to the next step.

In addition, in the present invention, the following can be suitably used as the sealant.

Room temperature curing (RTV) silicone rubber TSE399 (manufactured by Toshiba Silicone Corporation) TSE397
(manufactured by Toshiba Silicone Company) Silicone oil compound SH4 (manufactured by Toray Silicone Company) SH14 (manufactured by Toray Silicone Company) Furthermore, in the present invention, a sealant 4 is provided both on and around the electrode 3 of the electrical wiring board 2. Alternatively, the FPC 5 may be crimped.

[Effect of the invention] As explained above, flexible printed board (FPC)
By applying a sealant to the electrode surface before the electrode is crimped, it is possible to completely prevent the recording liquid from entering the electrode crimping portion with a small amount of sealant and with a simple operation.

Furthermore, since the next operation can be carried out without waiting for the effect of the sealant, the entire operation process can be shortened.

It is a top process view showing the root side.

FIGS. 2A and 2B show the first embodiment 3 of the present invention...
Electrode 4...Sealant 5...Flexible printed board 6...Crimp rubber 7...Crimp fitting 8...Emboss 9...Screw hole 10...Holder 11...Supply pipe 12 . . . Presser fitting 13 . . . Head element process diagram.

1- Base plate 2...Electrical wiring board Figure IA Figure 1B Ne5; twin Akira 3A figure q Isamu 3B figure Figure 44 Figure 4B

Claims (1)

[Scope of Claims] A method for connecting a liquid jet recording head for electrically connecting the liquid jet recording head to an apparatus main body, comprising: providing a sealant on and/or around the electrodes of the liquid jet recording head; A method for connecting a liquid jet recording head, comprising the step of electrically connecting an electrode of a member for sending a signal from the device main body to the liquid jet recording head and an electrode of the liquid jet recording head. .