JPS62163223A - Key board - 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 (Field of Industrial Application) The present invention relates to a keyboard, and particularly to a keyboard C2, which is useful for manual keys, etc., in which a large number of movable contacts are attached to one substrate.

(Prior Art) Conventionally, keyboards with a large number of movable elastic contacts have been manufactured by first embedding vulcanized conductive contacts in desired locations in a mold designed in advance to have the shape of a desired keyboard. Then, unvulcanized insulating rubber is placed on top of the rubber, heated and pressurized to create a push button switch member that connects and integrates a large number of push button switches used in this keyboard. This is done by attaching multiple through holes or comb-shaped electrodes to a substrate provided at predetermined positions.

Therefore, this requires mold design and manufacturing for the manufacture of push button switch parts, and this also requires mold setup, trial punching, and product inspection, so high-mix, low-volume production is required. ζ: has the disadvantage of poor efficiency and high mold depreciation costs, making the product unit expensive. It is necessary to increase the key pitch, and when using other methods, a special peripheral fixing jig is required for fixing the push button switch member (two steps become complicated, and the resulting keyboard becomes expensive). There is also a disadvantage.

(Structure of the Invention) The present invention relates to a keyboard that solves the above-mentioned disadvantages, and the present invention relates to a keyboard in which a single push button switch member is formed by punching holes (
=The arrangement is fixed.

That is, as a result of various studies by the present inventors on an inexpensive manufacturing method for keyboards that can accommodate high-mix, low-volume production, the present inventors discovered that the push-button switch member used in this product was constructed by connecting and integrating a large number of push-button switches. Prepare a large number of these as a single standard push-button switch without using a standard push-button switch. If the push button switch is fixed to the base material with adhesive, there will be no need for a mold to be made for each arrangement pattern for the push button switch, which is an integral part of the push button switch, and the associated costs will be reduced. There is no need for this at all, and if the push button switch is fixed to the base material using bone cement, the installation cost can be reduced, making it possible to obtain the desired keyboard at a low cost. According to the authors, the present invention was completed by discovering that keyboards with arbitrary patterns can be obtained by punching holes in the base material, so that high-mix, low-volume production (2) can be readily produced.

The single push-button switch member constituting the keyboard of the present invention may be of any known type; therefore, it may be made of elastic material whose sliding portion is an inverted curved elastic rubber rod, or may be made of elastic material whose sliding portion is made of an elastic rubber rod shaped like an inverted curve, or a push-button switch member whose sliding portion is made of an elastic material made of a metal plate. Examples include things that have a body. This elastic push button switch is made of natural rubber, polybutadiene, polyisoprene, 8BR
It may be made from synthetic rubbers such as diene-based synthetic rubbers such as , neobunone, ethylene-propylene-based, phrethane-based, polyester-based, and silicone-based rubbers, which have excellent heat resistance, weather resistance, and electrical insulation properties. It is preferable to use silicone rubber (for those using this metal plate), it is preferable to use a molded piece of stainless steel with a disc spring pressed into an inverted bowl shape to give it elasticity. .

Further, this push button switch member may be entirely insulative or electrically conductive, but usually the contact portion is 4-conducting and the dome portion is insulating.
These may be made in large numbers by a known method such as compression molding, injection molding, or transfer molding.

On the other hand, the base material constituting the keyboard of the present invention is made by punching a through hole for arranging the single push button switch member described above, and this material is made of polyester, polycarbonate, polyacrylate, polyarylate, polyimide, It may be made of plastic such as silicone rubber, rubber, metal plate, or metal foil. The size of this base material is arbitrary depending on the intended use of the keyboard, but if the thickness is less than 10 μm, it will be too thin and transportation will be inconvenient, and if it is more than 2.000 μm, the material cost will be high, and the material will be punched. Processing becomes difficult, so 10~2,
It is necessary to have a range H of 000 μm, but the preferable range is 75 to 300 μm. Holes may be punched in this base material by punching, laser processing, or blade processing, but the number and arrangement of these holes are determined by the purpose, use of the keyboard to be lowered, usage conditions, and molding shrinkage after assembly. The pattern should be .

Note that although this base material is usually electrically insulating, it may be conductive or semiconductive in order to prevent static electricity and prevent static air pollution, and is referred to as S@ conductive or semiconductive. In order to do this, it may be made of plastic or rubber kneaded with conductive carbon black, carbon fiber, metal powder, metal fiber, etc., or the base material may be made of metal plate. It may be made of an insulating material coated with conductive paint, vacuum-deposited or plated with metal, or laminated with a conductive material.

The keyboard of the present invention is manufactured by arranging and fixing the single push button switch member in the hole of the base material which has been subjected to the punching process described above. When fixing the push button switch member by fitting it into the base material hole, it is required that the legs of the push button switch have a relatively large pitch. After the legs are inserted, they may be fixed with an adhesive or an adhesive; in this case, the adhesive or adhesive is applied in advance around the hole in the base material by a casting method, a topping method, etc. After inserting the push-button switch member, the legs may be pressed down and fixed with adhesive to the base material. It is sufficient to drop the necessary amount of adhesive on the leg C2 of the switch member before inserting and pressing, but this may be done by applying heat, pressure, etc. to accelerate curing if necessary. But that's fine.

The thus obtained keyboard of the present invention is in contrast to the conventional keyboard, which required the use of molds designed for individual keyboards in order to make an integrated push button switch member. , a specific single standard push button switch member is used, and the base material can be punched in any pattern, so a keyboard with any pattern can be obtained with a large capacity and at a low cost. According to this 22, it is possible to produce a wide variety of products in small quantities, and it also has the industrial advantage of shortening delivery times and improving production efficiency (2 Examples of the present invention) I'll give you.

Reference Example 1 (Manufacture of push button switch parts) 70 parts of silicone rubber compound KE742μ [trade name manufactured by Shin-Etsu Chemical Co., Ltd.] and 30 parts of acetylene black powder.
A conductive rubber containing 0.5 parts of Jigmill peroxide and 0.5 parts of Jig Mill peroxide was molded at 50 KP/cnr and 170°C to make a conductive contact, and then this was placed in a predetermined position in a mold for molding a push button switch. After that, an insulating rubber compound made by adding 15 parts of dicumyl peroxide to 100 parts of this mold C silicone rubber compound KE951U (trade name manufactured by Shin-Etsu Chemical Co., Ltd.) was charged, and 50"/ca
1, and molded at 170°C to produce conductive contacts and insulating solids.

Reference Example 2 Insulating properties obtained by adding 40 parts of calcium carbonate, 3 parts of digmil peroxide, 1 part of vulcanization aid, and 40 parts of paraffin softener to 100 parts of ethylene propylene rubber EPDM501A (trade name manufactured by Sumitomo Chemical Co., Ltd.) The rubber compacted material was charged into a mold and molded under the conditions of 5 (UP/c/, 170°C) to produce 480 push button switch members in individual pieces.

Example 1 250 x 50
Product name] was topping processed, a silicone rubber film with a thickness of 0.1 mx was rolled and bonded, and a polypropylene film with a thickness of 0.02511x was laminated as a cover film.
011LIIl, diameter 1], 50, pitch 14.5R1 in a pattern of 12 holes with a pattern of 3 vertically and 4 horizontally, and then the polypropylene film was peeled off to prepare a base material.

Next (= After applying a 3 μml thick cyanoacrylate adhesive as an adhesive around the hole of this base material,
When the 12 push-button switch members obtained in Reference Example 1 were inserted and arranged in this, and they were heated in an oven at 160°C for 3 minutes to harden the adhesive, the push-button switch members were firmly attached to the base material. A bonded keyboard was obtained, and the pushbutton switch passed a 5 million key press test.

Example 2 A 300 x 300 x 0.2 mm polyester sheet was treated with Primer 44 (part name manufactured by Shin-Etsu Chemical Co., Ltd.) and dried, and then a silicone rubber film with a thickness of 0.1 mm was applied thereon in the same manner as in Example 1. Then, using a male and female punching tool, holes with an outer size of 60 x 170 mm, a diameter of 11.5 mm, and a pitch of 14.5 mm were formed by 3 vertically and 4 horizontally.
The silicone rubber film was peeled off after punching out 30 pieces in a pattern.

Next, apply adhesive to a thickness of 5 μ77 L (Nimiya cloth) around this hole, then insert and arrange 30 push button switch members obtained in Reference Example 1, and place them in an oven at 160°C for 30 minutes. When this adhesive was cured by heat treatment for a few minutes,
A keyboard in which the push-button switch member was firmly adhered to the base material was obtained, and this push-button switch passed a keystroke test of 5 million times.

Example 3 100X100X0.15iIm polyxste) Lt
;/ Using a punch on the
16 holes with a diameter of 5.5 mm were punched out in a pattern of 4 vertically and 4 horizontally.

Next, the side of the leg of the push-button switch obtained in Reference Example 1 facing the base material was treated with a primer with an alkali such as sodium hydroxide, and after drying, 0.0% of α-cyanoagerylate adhesive was applied to this. After dropping #05, it was inserted into the hole in the base material and pressed to harden the adhesive, resulting in a keyboard in which the push button switch member was firmly adhered to the base material, and this push button switch passed the 5 million keystroke test C:

Example 4 Primer/164 ( After drying, a material coated with adhesive was inserted and placed, and then heated in an oven at 160°C for 3 minutes to harden the adhesive. A keyboard was obtained which was firmly adhered to the keyboard, and this push button switch passed a 5 million key press test.

Example 5 0.05.9 drops of α-cyanogellate adhesive was added to the side facing the base material of the leg of the EPDM push button switch member obtained in Example 2, and this was applied to the push button switch member obtained in Example 3. When the push-button switch members were inserted into the holes of a polyester base material that had been punched, and the adhesive was cured, a keyboard was obtained in which the push-button switch members were firmly adhered to the base material. passed the 5 million keystroke test.

Patent applicant: Shin-Etsu Polymer Co., Ltd. ゛－“・２”

Claims (1)

[Scope of Claims] 1. A keyboard characterized in that a single push-button switch member is arranged and fixed in a hole of a base material that is punched in a desired size and in an arbitrary pattern. 2. The keyboard according to claim 1, wherein the push button switch member is arranged and fixed in the base material hole with an adhesive.