JPS63237320A - Manufacture of rubber key - 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] This invention relates to a method for manufacturing a rubber push button (rubber key) for opening and closing electrical contacts used in remote control devices such as televisions, videos, and CD players. Regarding.

[Conventional technology]

Rubber keys for opening and closing electrical contacts are screen-printed with symbols and numbers to identify the key. However, the edges and corners where the top and sides of the rubber key intersect are rounded to improve the feel of the rubber key, so if you want to print up to the edges, such as half the entire top surface, you can use the The screen does not follow the rounded edges, and the printing becomes blurred and unsightly at the edges.

[Problem that the invention seeks to solve]

An object of the present invention is to provide a rubber key in which the edge of a portion of the top surface of the rubber key that is different in color from the other portion is clearly colored.

[Means for solving problems]

In order to achieve this object, the present invention has a top surface constituting surface that constitutes a part of the top surface of the key, and a side surface constituting surface that is continuous with the top surface constituting surface, and is embedded in the key. A rubber piece having an inclined surface in which at least a part of the surface extending in the direction T intersecting with the surface is inclined toward the opposite side of the top surface forming surface is placed in the mold, and the top surface forming surface and the side forming surface are placed inside the mold. The present invention provides a method for manufacturing a rubber key, characterized in that the rubber key is molded by placing a rubber piece in contact with a mold, and injecting a rubber piece and injected rubber of different colors into a mold.

[Effect]

According to this invention, a rubber piece of a color different from that of the rubber forming the key is arranged in a mold with the top surface forming surface and side surface forming surface in contact with the inner surface of the mold, and the rubber piece of a color different from that of the rubber piece is injected. When rubber is injected into a mold to form a rubber key, a piece of rubber is used in which at least a part of the surface extending in a direction intersecting the top surface has an inclined surface that is inclined toward the opposite side of the top surface. Therefore, the injection pressure of the injected rubber acts on the inclined surface that is integrally connected to the injected rubber, and the top and side surfaces of the rubber piece are pressed against the inner surface of the mold, so that the rubber piece is bonded to the metal. It is possible to obtain a rubber key that does not move within the mold due to the injected rubber and is integrally molded in a predetermined position with respect to the injected rubber, and whose top surface is partially colored properly up to the edge.

[Example] An example of a rubber key made by the manufacturing method of the present invention shown in FIGS. 1 and 2 will be described. This rubber key 1 is a rectangular parallelepiped, and a thin rubber film is formed around the four circumferences on the opposite side of the top surface. A spring part 6 which is formed into a pyramidal cylinder shape that spreads outward, a connecting part 7 which connects a plurality of rubber keys 1 via the spring part 6, and a connecting part 7 which is formed on the surface opposite to the inner top surface of the spring part 6. The rubber key 1 has a protrusion 8 for operating an electrical contact, and is made of injected rubber 9 molded by injection, and a pre-filled rubber key 1 that is different in color from the injected rubber 9, which is marked with dots to distinguish it from the injected rubber 9. It consists of a molded rubber piece 2 integrated with injected rubber 9, and includes a top surface 3 forming a part of the top surface of the rubber key 1, and a side surface 4 continuous with the top surface 3. and an inclined surface 5 which extends in a direction intersecting the top surface forming surface 3 integrally bonded to the injection rubber 9 and is inclined into eight protrusions.

As shown in FIG. 3, in this rubber key 1, a pre-molded rubber piece 2 is placed on the top forming surface 3 and side forming surface 4 of the mold inner surface 11 of the mold 10, respectively. are placed in contact with each other, and injection rubber 9 is injected.

The inclination angle α of the inclined surface 5 with respect to the side surface 4 is generally selected between 5 and 85°. For example, when forming a U-shaped top surface having different colored parts like the rubber piece 2& in Fig. 1, it is recommended to use a rubber piece 2a having the shape shown in Fig. 4. In piece 2a, the central side surface 4
Although the sloped surface 5 is formed only in the portion corresponding to the side surfaces 4 at both ends, the sloped surface 5 may also be formed in the portion corresponding to the side surface 4 at both ends.

〔Effect of the invention〕

According to the present invention, it is possible to provide a rubber key in which a part of the top surface has a different color from the rest of the key, and the color is clear up to the edge.

Brief description of the main aspects FIG. 1 is a plan view of an embodiment of a rubber key made by the manufacturing method of the present invention, FIG. 2 is an enlarged sectional view taken along the line A-A in FIG. 1, and FIG. 3 is a rubber piece. A cross-sectional view showing the arrangement of the inside of the mold,
FIG. 4 is a perspective view of the rubber piece 2a of FIG. 1.

1...Rubber key 2.2a...Rubber piece 3...Top surface 4...Side surface 5...Slanted surface 6...Spring part 7...Connection part 8...Protrusion 9...Injected rubber 10.・Mold 11...Inner surface of the mold

Claims (1)

[Claims] (1) It has a top surface constituting a part of the top surface of the key and a side surface constituting the top surface and is continuous with the top surface constituting surface, and extends in a direction intersecting the top surface constituting surface embedded in the key. A rubber piece having an inclined surface in which at least a part of the surface is inclined toward the opposite side of the top surface forming surface is placed in a mold with the top forming surface and the side forming surface in contact with the inner surface of the mold, and the rubber piece A method for manufacturing a rubber key, which comprises injecting injected rubber of a different color into a mold to form a rubber key.