JPS61225784A - Manufacture of elastically electric circuit part - 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]

(Industrial Application Field) The present invention relates to a method for manufacturing elastic electrical circuit components, and in particular to elastic electrical circuit components that are useful for connectors used between IC boards, flexible boards, boards with input contacts, display boards, etc. This invention relates to a method for industrially manufacturing circuit components with high precision. (Prior Art) As for elastic electric circuit parts, there are known input push buttons and conductive 7-nectars which are made by combining an insulating rubber member and a conductive member containing carbon black or the like. However, these are usually made by putting unvulcanized rubber material into a mold and vulcanizing it, or by molding vulcanized insulating rubber and unvulcanized conductive rubber in a Dan MI L mold. 2) Because the molded product is manufactured using a method that makes it difficult to mold, it has the disadvantage that the dimensions of the molded product may vary due to shrinkage or expansion during vulcanization molding of unvulcanized rubber. It is difficult to mold the product, the total mold cost is high, and the mold cost is small.

[The drawback is that it is extremely difficult to produce.On the other hand, recent engineering C boards are trending towards precision miniaturization, and this includes extremely sophisticated structures made using photo printing methods, such as flexible connectors, etc. There is also a need for a method for manufacturing precise and complex circuits in a simple manner. (Structure of the Invention) The present invention relates to a method for manufacturing an elastic electrical circuit component that overcomes the disadvantages of the conventional methods. '' to cut out a circuit section, press an unvulcanized conductive or insulating rubber material into the cutout, and then heat and cure the unvulcanized rubber to form an integrally molded product. Namely, as a result of various studies on simple manufacturing methods for elastic electric circuit components, the present inventor noticed that it is possible to irradiate laser beams onto various rubber materials that have already been vulcanized and hardened. The prepared insulating vulcanized molded product is irradiated with a laser beam to give the molded product “4. If you draw an electric circuit diagram and fill the electrical circuit diagram cut out with this laser beam with a conductive rubber material, you can create the desired conductive circuit!
We discovered that it is possible to easily and accurately obtain molded products with no dimensional changes, and we have developed a new type of rubber material.
The present invention was completed by progressing research on laser processing methods. Examples of the rubber member used as the base material in the method of the present invention include synthetic rubber such as natural rubber-ethylene-propylene, 88R, NBR, silicone rubber, etc. From these points of view, it is preferable to use silicone rubber. This base material is said to be made of electrically insulating rubber, but depending on the purpose, it may be made of a conductive material containing a conductive substance such as carbon black. It may be formed in advance into a desired shape and vulcanized and hardened by means such as heating. The method of the present invention irradiates the base material of the vulcanized rubber molded product with a laser beam and uses the energy to cut out a predetermined portion. laser is suitable. It is better to use carbon dioxide laser beams because they have good absorption efficiency into rubber, but these are several watts to several tens of watts.
(1°) This laser beam processing can be done by drawing a figure corresponding to the circuit diagram to be formed on the base material of the rubber molded product with the laser beam. This is 75t1M
, Child N, C! , if you store it in the control device, it will automatically produce as many pieces of the same shape as you like) - f1 A → S1
, ν can be repelled 100 L-out 17F 9 I, ^, so this labor saving can be easily achieved. Also,
In this case, the irradiation time and operating time can be controlled depending on the thickness of the molded product and the depth of the circuit diagram to be drawn on the molded product.
For example, in order to cut out a circuit diagram on a silicone rubber molded product with a thickness of two wings, a carbon dioxide laser beam of vo, os ~ 0.
It is sufficient to irradiate the SMS address sequentially. A desired circuit diagram is cut out on the surface of the molded product base material by laser beam irradiation, and conductive rubber is then embedded in this cutout. This can be done by pressing a conductive rubber material into the cutout, but
[This is a good idea] A liquid conductive rubber material may be injected into the cutout. After press-fitting or pouring this conductive rubber material, if the conductive rubber material is cured by heating or other means, it can be integrally molded with the insulating member, making it easy to create elastic electrical parts with the desired electrical circuit. and positive RK m fi r J-
When press-fitting or injecting the rubber material of fddesassu 訃7 Shiba (I) Z1 Shihanei A, firing residue (ash) from the laser beam may remain in the cut-out part, and if this remains, the rubber Since adhesion with the material is hindered, it is recommended that the rubber be immersed in an RX solvent, such as ethanol, which has a low surface tension and does not adversely affect the rubber, and then subjected to ultra-high frequency cleaning. According to the method of the present invention, parts with different circuit diagrams can be easily manufactured by simply changing the control board that stores the original design drawings, so this is particularly effective for small-lot, high-mix production. However, in order to mass-produce type B products, it is necessary to use a thicker molded product as the base material, or to make multiple molded products by cutting out the same circuit diagram. These are stacked, and the cutout is filled with 41 [sexual material].
After hardening, it may be sliced in parallel. In addition, above, we explained the method of cutting an insulating rubber molded product to create a cutout 7 and filling this with conductive rubber. However, this method involves processing a conductive rubber molded product with a laser beam and filling this with insulating rubber. It may be filled with rubber. Next, the method of the present invention will be explained based on the attached drawings. , FIGS. 1 to 5 illustrate the method of the present invention according to its working order, and FIG. 1 is a perspective view showing the method of processing a base material of a rubber molded product using a laser beam MK, and FIGS. 4
The figure is a vertical sectional view showing the M layer of the blanked molded product base material and the filling and cutting process of conductive rubber. Box 5 shows a perspective view of the intended elastic electric circuit component. be. K1
The figure shows a method for making a circuit diagram hole 4 by irradiating a laser beam 3 from a laser beam radiator 2 such as a carbon dioxide gas laser beam onto a rubber molded base material 1 that has been press-molded in advance. Processing is done using laser beams! The irradiation can be carried out sequentially according to FIG. 16, and this work can be carried out fully automatically by using the automatic NCt control device Rw in which the circuit diagram is stored. The base material 5 with the circuit diagram holes 4 cut out is then sandwiched between the two base materials 5 with the holes cut out with conductive rubber material 6t, as shown in FIG. By stacking the plastic plates 7 through each other and applying and pressing the suppression plates 8 on the top and bottom, the conductive rubber material 6 is introduced into the cutout of the circuit diagram hole 4 while excluding electricity, and the air inside the cutout is porous plastic plate 715r - degassed through the third
A block body 9 as shown in the figure is formed, and by heating it to an appropriate temperature, this conductive rubber material 6 is formed.
is vulcanized to form an integrally molded product in which the circuit diagram hole 4 of the base material 1 is filled with a conductive rubber material 6. Next, this block-shaped molded product is dismantled and the plastic plate 7 is removed to obtain the desired elastic electric circuit component, but in order to obtain this in the form of a thin film, a layer of conductive rubber material 6 is applied. By slicing the two sheets with the slicing blade 10 in the forming direction, a thinner object 11 shown in FIG. 5 can be obtained. Note that this elastic electric circuit component 11 may be used as is, but this
As shown in Fig. 16, W, and Fig. 7, conductive rubber plate 12. It may also be tamped with an insulating rubber plate '13. In addition, when the molded product base material 1 is difficult to adhere to each other, these surfaces! They may be treated with a primer and then laminated together using a suitable adhesive. Next, Examples of the present invention will be given, and the parts in the four examples indicate parts by weight. Example 1 Silicone rubber KE951U [trade name manufactured by Shin-Etsu Chemical Co., Ltd.] 100 parts with 2 parts of dicumyl peroxide added to it. Silicone rubber foam bound to IFJ force fλ pattern.
A vulcanized base rubber plate of 300 x 300 x 2 m was made by hot pressing at 10 bar y Q n 1 F-/ -J ^^ia- for 3 minutes. Next, while irradiating this base material rubber plate with a 2-20 W carbon dioxide laser beam myx pulse time 0.2 ns,
After cutting out the electrical circuit diagram hole at a speed of 00 m/sec, conductive silicone rubber KE1942 [Shin-Etsu Chemical Co., Ltd. 1! ! The conductive silicone rubber compound was filled into the cutout hole by pressing the product [trade name] with a neck of 0.5 and 4/-d, and then heated at 150°C for 20 minutes to vulcanize the conductive silicone rubber. When cured, an elastic 4° electrical circuit component made of silicone rubber in which the cutout portion was made conductive was obtained. Example 2゜Silicone rubber-KE made according to the method of Example 1
951U″4r-Main material 300X300X2m11
10 circuit diagrams were cut out from the base rubber plate using a carbon dioxide laser beam in the same manner as in Example 1, conductive silicone rubber KE1942 was sandwiched between these two sheets, and these were made into a breathable material. They were stacked with plastic plates interposed between them, suppressing plates were stacked on top and bottom, and the cutout circuit diagram was filled with conductive rubber by pressing it against IK9/cWt, and then the conductive silicone rubber was heated to 150°C. This was cured with sulfur and sliced into 0.3-thick pieces using a cutter made of high-speed steel, yielding 50 elastic electrical circuit parts made of silicone rubber in which the cutout portions 11 were made electrically conductive.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a method of processing a rubber molded product base material using a laser beam according to the method of the present invention, Fig. 2 is a longitudinal cross-sectional view of a rubber molded product base material laminate that has been punched out (inside the cut), and Fig. 3 4 is a longitudinal sectional view of the laminate filled with conductive rubber, FIG. 4 is a longitudinal sectional view showing the cutting process, and FIGS. 5 to 7 are perspective views of the elastic electric circuit component. 1...Rubber molded product base material. 2...Laser beam emitter. 3...Laser beam. 4...Schematic diagram hole. 6... Conductive rubber material - 7... Plastic plate. 8... Suppression board. 9...Block letters. 10...Slicing blade. 11...Elastic electric circuit component.

Claims (1)

[Claims] 1. A circuit section is cut out by irradiating a vulcanized insulating or conductive rubber molded product with a laser beam, and an unvulcanized conductive or insulating rubber material is pushed into the cutout, A method of manufacturing an elastic electric circuit component, which comprises then heating and curing the unvulcanized rubber to form an integrally molded product. 2. The method for manufacturing an elastic electric circuit component according to claim 1, wherein the rubber molded article and the rubber material are made of silicone rubber.