JPH0224179Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a push button device used in electronic equipment such as a video tape recorder (VTR).

(b) Prior Art Conventionally, a mark for displaying the operation mode, etc. is attached to the top surface of a push button base, and in order to improve the appearance, it has been disclosed in the conventional example part of Publication of Utility Model Application No. 57-60337. As shown in the figure, a method of attaching a cover to the push button base is widely used. However, when the push button base and the cover are separate parts as described above, work such as alignment and gluing of the push button base and the cover is required when attaching the cover, resulting in poor workability. Further, in order to give the surface of the push button part a metallic luster, it is necessary to make the cover made of aluminum or to apply plating to the cover made of synthetic resin. In particular, when applying plating, if you use a cover that has been plated in advance, you only need to plate only the push button part after installing the cover to prevent damage such as peeling off the plating during installation. - In the case of a push button in which the push button base and the hinge part are integrated as shown in Publication No. 141802, if the plating is accidentally placed on the hinge part, the elasticity of the hinge part will be significantly weakened and the operability of the entire push button device will deteriorate. Connect.

(c) Purpose of the invention This invention was created in view of the above points,
To provide a push button device in which a base body, a push button base, a hinge part, and a push button cover are integrally formed, and only the push button cover is plated.

(d) Structure of the invention In this invention, a base body and a push button base are integrally molded using a first synthetic resin via a hinge part, and a push button cover having a display hole is placed on the push button base using a second synthetic resin. The push button device is characterized in that the first synthetic resin is a synthetic resin that is difficult to plate, and the second synthetic resin is a synthetic resin that is easy to plate.

(e) Embodiment An embodiment of the present invention will be described below with reference to the drawings.

Fig. 1 is a partially cutaway perspective view of an embodiment of the present invention, and Fig. 2 shows an example of the push button device shown in Fig. 1.
FIG. 3, a perspective view of the VTR, is a sectional view of the main part taken along line A-A' in FIG. 1 is a base body, which has a plurality of through holes 1a.
... is provided, and the base 1 and the top surface are fast forwarded (
), rewind (), playback (), etc., are provided with a first protrusion 2a in the shape of a mark for displaying operation modes, and a second protrusion 2 for pressing a tact switch is provided on the back side.
The push button base 2 provided with the push button base 2 is integrally molded with a synthetic resin (first synthetic resin) such as polycarbonate, which is difficult to plate, via an elastic hinge portion 3. A mold is placed on the molded product and a synthetic resin (second synthetic resin) that can be easily plated using a two-color injection molding method, such as ABS.
The push button cover 4 is placed on top of the push button base 2 using resin.
to be formed. Note that the mold is the push button base 2.
The push button cover 4 is shaped such that a display hole 4a for exposing the first protrusion 2a of the push button cover 4 is provided on the front side. The push button member 5 thus formed is chemically etched to remove the butadiene component on the surface, and then chemically plated. Then, electrodes are formed only on the surface of the push button cover 2, which is molded from ABS resin containing a butadiene component,
Thereafter, if electroplating (chrome plating) is performed in a plating bath, only the push button covers 2 will be chrome plated. As mentioned above, the push button member 5, in which only the push button cover 2 has been plated, is used for VTR as shown in FIG.
The through-holes 1a are inserted into the columnar projections 6a provided on the inner surface of the front panel 6 and fixed by melting, thereby forming a push-button device that is attached to the VTR main body. When a pressing force is applied from the direction of the arrow in FIG. 3, the hinge portion 3 is elastically deformed, and the second protrusion 2b...
can press the pressing portion 8a of the tactile switch 8 on the printed circuit board 7 screwed inside the VTR to perform the desired operation. Furthermore, the first
The part indicated by the dashed line in the figure is a molding runner 9 for injecting ABS resin when molding the push button cover 4 using the mold, and is a molding runner 9 for injecting ABS resin when electroplating is performed. Since each of the push button covers 4... is electrically connected by the previous chemical plating, all the push button covers 4...
...can be plated at once. Further, the molding runners 9 are removed by post-processing after the plating process.

(f) Effects of the invention As described above, according to the invention, the push button base with the hinge part and the push button cover are molded from two types of synthetic resins that have different ease of plating, so plating can be done at the same time. Moreover, since the synthetic resin used to mold the hinge part is made of a material that is difficult for plating to adhere to, there is no risk of plating accidentally resting on the hinge part, weakening the elasticity of the hinge part itself and impairing the operability of the push button device. In addition, since the push button base and the push button cover are integrally formed, they can be managed as one part, which improves assembly work efficiency and is extremely effective.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view of an embodiment of the present invention, and Fig. 2 shows an example of the push button device shown in Fig. 1.
FIG. 3, a perspective view of the VTR, is a sectional view of the main part taken along line A-A' in FIG. Explanation of main drawing numbers, 1...Base body, 2...Push button base, 3...Hinge part, 4...Push button cover, 4a...
...Display hole.

Claims (1)

[Scope of utility model registration request] In the push button device, the base body and the push button base are integrally molded with a first synthetic resin via a hinge part, and a push button cover having a display hole is molded on the push button base with a second synthetic resin. A push button device characterized in that the first synthetic resin is a synthetic resin that is difficult to plate, and the second synthetic resin is a synthetic resin that is easy to plate.