JPH06328506A - Production of panel button for electrical component and its panel button - Google Patents

Abstract

PURPOSE:To form an automatic restorable push button on plastic sheet material by providing a recessed part on the bottom of the cavity of a retainer plate at a movable side and providing a projected part capable of being inserted into the recessed part around the gate of a core retainer plate and introducing the plastic sheet material into both retainer plates allowed to abut and inserting the plastic sheet material into the cavity and injecting synthetic resin through the gate. CONSTITUTION:An injection molding die is constituted of a movable retainer plate 1 having a cavity 2 provided with a recessed part 3 for molding a button on the bottom and of a core retainer plate 5 provided with a projected part 9 on the rear surface around a gate 8 and used. Plastic sheet material 13 intervening between the retainer plate 1 at the movable side and the core retainer plate 5 is inserted into the cavity 2. A part of the plastic sheet material 13 is inserted into the recessed part 3 for molding the button by the projected part 9. Therein synthetic resin is injected on the back of the plastic sheet material 13 and both a plastic projection 15 and a plastic thin-walled layer 16 are integrally laminated to form a push button 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a panel button for electric parts used for electric switches and the like, and more particularly to a panel button for molding the plastic sheet material by injecting a synthetic resin. The present invention relates to a panel button manufacturing method and a panel button, which are formed by integrally laminating a plastic panel, a thin plastic layer, and a plastic protrusion on the back surface.

[0002]

2. Description of the Related Art A conventional panel button of this type and a method of manufacturing the same include a plastic panel having holes formed in predetermined portions and a plastic sheet attached to the plastic panel. A button convex part that can be automatically restored corresponding to the hole of the plastic panel is partially formed by press working or vacuum forming, and then a plastic sheet is placed on the plastic panel so that the button convex part and the hole match. It was made by pasting.

However, the above-mentioned method requires complicated molding because the plastic sheet and the plastic panel must be separately molded and then the plastic sheet must be adhered to the plastic panel while being accurately aligned. There was a problem that it required skill and the work efficiency was extremely poor.
Further, since it is difficult to align the button protrusion and the hole with each other, there is a problem that a defective product in which the positions of the two are slightly deviated is generated. Moreover, there is a problem that air bubbles are easily generated between the plastic sheet and the plastic panel and wrinkles are easily generated. Further, if it is used for a long period of time, there is a risk that the plastic sheet may peel off from the plastic panel.

Recently, in order to improve the above-mentioned conventional problems, a new technique as disclosed in, for example, Japanese Patent Publication No. 4-11094 is developed. According to the present invention, a painted plastic film is housed in a cavity, a synthetic resin is injected onto the back surface of a part of the plastic film to form a molded product, and a part of the plastic film on which the synthetic resin is not injected is embossed. This is a technique in which this portion is curved to form irregularities by processing.

[0005]

However, in the latter invention, the plastic film is housed in the cavity and the synthetic resin is injected on the back surface of a part of the cavity, while the other part where the synthetic resin is not injected is the core mold. This is a method of embossing with the fixed mold protrusion to form irregularities on the plastic film, so that the precision of the molded product is good, but there were the following problems.

(1) Since the plastic film is provided with irregularities by embossing, the irregularity once formed is blurred due to the restoring force of the film itself.
(2) If the plastic film is deeply squeezed, there is a risk of breakage, and thus it is difficult to form large unevenness.
(3) It is difficult to provide the plastic film with a sharp-edged concavo-convex shape. (4) It is difficult to use a thin plastic film, and therefore accurate and sharp molding is difficult. (5) It is difficult to form unevenness such as fine characters and figures on the surface of the plastic film by embossing.

(6) Since the plastic film is strongly pressed by the fixed mold protrusion and the core mold, there is a problem that the print on the surface of the plastic film is damaged or peeled off. (7) Since the concavo-convex portion formed by embossing is formed only of the plastic film, when this portion is used as a push button for electrical parts, there is a problem of poor durability. (8) Since the embossing is performed while being heated in the injection molding die, there is a problem that the plastic film in the embossed portion is changed by heat and becomes weak. (9) When the button diameter is increased or decreased,
When the button is pressed, there is a problem that the flexibility is different and the variation occurs.

The manufacturing method according to the present invention is a completely new technique developed in view of the above-mentioned conventional problems, and in particular, a plastic panel is integrally laminated on the back surface of a plastic sheet by injection molding of synthetic resin. In addition, a completely new method for manufacturing a panel button for electrical parts and a technology for the panel button, in which a push button with a high degree of self-restoration lined with a plastic layer by injection molding is formed on a part of a plastic sheet material, are provided. To do.

[0009]

A method of manufacturing a panel button for an electric component according to the present invention is a technique which fundamentally improves the above-mentioned conventional problems, and its gist is to insert a plastic sheet material. In the method of manufacturing a panel button, the movable side template having the cavity to be obtained, a core template having a runner, a sprue, and a gate therein, and a fixed side template having a sprue are used. A recess for button molding is provided at the bottom of the cavity of the side template, a convex portion that can be fitted into the recess is provided around the gate of the core template, and the movable side template is brought into contact with the core template and supplied between them. The plastic sheet material is inserted into the cavity, synthetic resin is further injected from the gate of the core template to laminate the plastic panel on the back surface of the plastic sheet material, and Is a manufacturing method of the collector parts panel buttons characterized by forming a push button which can be automatically restored to the rear surface of a portion of Kushito material provided and the plastic protruding plastic thin layer.

The panel button according to the present invention is a technique which has fundamentally improved the above-mentioned conventional problems, and its gist is to provide a plastic panel having a button hole at a predetermined position and the plastic panel. It has a structure in which a plastic sheet is integrally laminated on the front surface, and a thin plastic layer and a plastic protrusion are integrally provided on the back surface of the plastic sheet at a portion corresponding to the button hole. Panel button for electrical parts.

[0011]

As described above, in the method of manufacturing the panel button for electric parts according to the present invention, the synthetic resin is cavities while the plastic sheet material supplied between the movable side mold plate and the core mold plate is inserted into the cavity. Since the plastic panel is integrally laminated on the back surface of the plastic sheet material by injecting into, the plastic sheet material and the plastic panel can be firmly fixed to each other. Further, a concave portion for forming a button is provided at the bottom of the cavity, and a synthetic resin is injected to form a press button that can be automatically restored by curving while laminating a thin plastic layer and a plastic protrusion on the back surface of a plastic sheet material. Can be done. Furthermore, the holes provided in the plastic panel and the buttons of the plastic sheet material can be accurately matched.

The panel button for electrical parts according to the present invention is
Due to the above-mentioned structure, a plastic panel, a thin layer of plastic, and a protrusion of plastic are firmly and integrally laminated on the back surface of the plastic sheet material. Further, it is possible to obtain a product in which the hole of the plastic panel and the push button of the plastic sheet material are completely matched. Further, since the thin plastic layer and the plastic projection are integrally provided on the back surface of the push button of the plastic sheet, the strength of the push button can be remarkably increased. This push button can be molded by deeply narrowing it down to an acute angle. In addition, since the push button is provided with the thin plastic layer and the plastic projection on the entire surface, it can be prevented from being flattened by the restoration.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for manufacturing a panel button for electric parts and an embodiment of the panel button according to the present invention will be specifically described with reference to the drawings. FIG. 1 shows a molding die and a plastic sheet material showing the manufacturing method of the present invention. 2 is a sectional explanatory view of the molding die of FIG. 1 in a closed state, FIG. 3 is a sectional explanatory view of a state where a synthetic resin is injected into the cavity, FIG. 4 (A),
FIG. 5B is an explanatory view showing the configuration of panel buttons, FIG.
7A and 7B are cross-sectional explanatory views of a molding die that can inject and mold two kinds of synthetic resins, respectively, and FIG. 6 is an enlarged cross-sectional explanatory view of a state in which two kinds of synthetic resins are injected. A), (B)
Is a cross-sectional explanatory view showing a state where a synthetic resin is injected from the first gate on the back surface of a part of the plastic sheet material, FIG. 8 (A),
FIG. 9B is a cross-sectional explanatory view showing a state in which a synthetic resin different from the second gate is injected onto the back surface of the remaining remaining plastic sheet material to mold the push button, and FIG. FIG.

1 to 3, reference numeral 1 denotes a movable side mold plate in an injection molding die used in the manufacturing method of the present invention, and a cavity 2 is provided on an upper surface of the movable side mold plate 1. Has been drilled. A plurality of button forming recesses 3 are formed in the bottom of the cavity 2. Pattern recesses 4 such as characters and figures are formed deeper on the bottom surface of some of the button forming recesses 3.

A core template 5 is provided with a runner 6, a sprue 7 and a gate 8 in this order from the top to the bottom. Further, a convex portion 9 which can be fitted into the button-forming concave portion 3 is provided so as to project downward around the gate, and the concave portion 1 extends from the tip of the convex portion 9 toward the gate 8.
0 is drilled. Reference numeral 11 denotes a fixed-side template, on which a sprue 12 is provided. In particular, as is clear from FIG.
When the convex portion 9 is fitted into the button-forming concave portion 3, a small gap is formed between the tip of the convex portion 9 and the button-forming concave portion 3 so that a synthetic resin can be injected. ing. 13 is a plastic sheet material, on the outer surface of which a decorative print and an adhesive layer are laminated.

The method for manufacturing the panel button and the structure of the panel button according to the present invention using the injection molding die and the plastic sheet material 13 as described above will be described below. That is, FIG. 1 to FIG.
In (B), after the plastic sheet material 13 is interposed between the movable side template 1 and the core template 5, the movable side template 1 is brought into close contact with the core template 5 to close the cavity 2. At the same time, a part of the plastic sheet material 13 is pressed into the button-forming concave portion 3 by the tip of the convex portion 9.

In this state, as shown in FIG.
Sprue 12, runner 6, sprue 7, and gate 8
By injecting the synthetic resin into the cavity 2 through the plastic sheet material 13, the plastic panel 14 is integrally laminated on the back surface of a part of the plastic sheet material 13, and a convex portion is formed on the back surface of the plastic sheet material 13 of the other part. Recessed part 1 of part 9
A push button 17 that can be restored by laminating a plastic projection 15 corresponding to 0 and a plastic thin layer 16 around the plastic projection 15 and squeezing the plastic sheet material 13 by the button molding concave portion 3 to bend it into a button shape.
Can be formed. Further, by the action of the pattern recess 4 provided in the button forming recess 3, the push button 1
It is possible to project a convex pattern 18 such as characters and figures, which are clearly shown in FIGS. 4A and 4B, on the outer surface of 7.

In the above embodiment, the plastic panel 14 laminated on the back surface of the plastic sheet material 13 is used.
And the plastic projection 15 and the thin plastic layer 16
And the push button 17 are made of the same synthetic resin.
In order to improve the feeling, the plastic projection 15 and the thin plastic layer 16 laminated on the back surface side of the push button 17 can be made of a soft synthetic resin material such as urethane resin, as will be described later. .

That is, in this manufacturing method, as shown in FIG.
As shown in FIGS. 6A and 6B and FIG. 6, the sprue 7a and 7b and the first gate 8 which are independent from each other are provided on the core template 5.
a, the second gate 8b, and the fixed side template 11 also has two sprues 12a corresponding to the sprues 7a and 7b.
A molding die provided with 12b is used.

In the method of manufacturing the panel button, as shown in FIGS. 5 (B) and 6, the sprue 7 is manufactured by supplying a general molten synthetic resin to the sprue 12a of the stationary mold plate 11.
The molten synthetic resin is injected into the cavity 2 through a and the first gate 8a to laminate the plastic panel 14 on the back surface of the plastic sheet material 13.

A molten soft synthetic resin such as urethane resin is supplied to the sprue 12b so as to be interposed between the concave portion 10 and the convex portion 9 of the convex portion 9 and the button forming concave portion 3 through the sprue 7b and the second gate 8b. The molten synthetic resin is injected into the gap (the plastic sheet material 13 has already been inserted in this gap) to squeeze the plastic sheet material 13 to bend it, and at the center of the back surface of the plastic sheet material 13. The soft plastic projections 15a are stacked and projected, and the soft plastic thin layer 16a is stacked around the projections.
The flexible push button 17a can be formed.

In the manufacturing method shown in FIGS. 5 (A), 5 (B) and 6, the first core 7a and the second gate 7b are provided on the same core template 5, and the gates 7a and 7b Although the method of simultaneously injecting and molding different synthetic resins has been described, FIGS. 7 (A), (B) and FIG. 8 (A),
By using the two types of core molds 5a, 5b and movable side mold plates 1a, 1b as shown in (B), the plastic panel 14, the soft plastic protrusion 15a, and the soft plastic thin layer 16a are separately provided at different timings. It can also be molded.

That is, FIGS. 7A, 7B and 8
In (A) and (B), first, a hard synthetic resin is injected from the first gate 7a of the core mold 5a into the cavity 2 of the movable side mold plate 1a to mold the plastic panel 14, and then another Movable mold plate 1 from the second gate 7b of the core mold 5b
The soft synthetic resin is injected into the button-forming concave portion 3b of b to form the soft plastic protrusion 15a and the soft plastic thin layer 1
It is also possible to mold 6a.

In the above embodiment, the second gate 18b
The recess 1 where the plastic projections 15 and 15a are molded
Since it is provided at 0, there is a concern that a gate mark of the protrusion may be formed on the outer peripheral surfaces of the plastic protrusions 15 and 15a. Therefore, in order to prevent the gate traces from being formed on the plastic protrusions 15 and 15a, the second gate 8b may be moved to a position other than the recess 10 and manufactured as shown in FIG. Is.

As described above, the panel button according to the present invention is the plastic sheet material 1 for the push buttons 17 and 17a.
Since the plastic protrusions 15 and 15a and the plastic thin layers 16 and 16a are integrally laminated on the entire back surface of 3, the push buttons 17 and 17a are different from the push button formed by embossing only the plastic sheet material 13.
You can make the diaphragm deep and sharp. Therefore, it is possible to reliably form the push buttons 17 and 17a which are high in height, curved at a steep angle close to a right angle, and having a sharp concavo-convex pattern.

Further, in the panel button according to the present invention, since the injection synthetic resin is entirely laminated on the back surface of the plastic sheet material 13, the thin plastic sheet material 13 is formed.
There is no fear that the uneven portion may be extended by the restoring force of the plastic sheet material 13 or may be damaged by long-term use as in the case of molding by conventional embossing. Further, since the plastic sheet material 13 is not strongly pressed as in the embossing, there is no fear of weakening the strength of the plastic sheet material 13 or peeling the print layer on the surface of the plastic sheet material 13. In addition, when a conductive material such as carbon is mixed in the injection resin, it is possible to energize with the push buttons 17 and 17a.

[0027]

The method of manufacturing a panel button for electric parts and the panel button according to the present invention have the above-described structure and operation, and thus have the following effects.

(1) In the manufacturing method according to the present invention, the plastic panel, the plastic protrusions, and the thin plastic layer are laminated on the entire back surface of the plastic sheet material by injection molding of synthetic resin, so that both are integrally fixed and Highly accurate products can be mass-produced with simple processes. (2) A push button can be formed by injecting a synthetic resin into a part of a plastic sheet material and bending it while laminating a plastic protrusion and a thin plastic layer. (3) The hole of the plastic panel and the position of the push button can be accurately matched.

(4) The pressing button can be deeply squeezed at the time of molding, so that the pressing button having a large ruggedness and an acute angle can be formed. (5) It is possible to prevent the plastic sheet material of the push button portion from being restored and losing its shape.
(6) A press button with high durability can be molded. (7) Sharp characters, patterns, etc. can be displayed on the outer surface of the push button. (8) When a soft synthetic resin is laminated on the back surface of the push button, a push button having a good feel can be formed. (9) It is possible to prevent the printing provided on the plastic sheet material from peeling off when the press button is molded.
(10) Even when the diameter of the push button is different, it is possible to obtain a push button that is rich in flexibility and has no variation in feel.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a molding die and a plastic sheet material showing a manufacturing method of the present invention.

FIG. 2 is an explanatory cross-sectional view of the molding die of FIG. 1 in a closed state.

FIG. 3 is an explanatory cross-sectional view of a state in which a synthetic resin is injected into a cavity.

4 (A) and 4 (B) are explanatory views showing a configuration of a panel button.

5 (A) and 5 (B) are cross-sectional explanatory views of a molding die capable of respectively injecting and molding two kinds of synthetic resins.

FIG. 6 is an enlarged cross-sectional explanatory view of a state where two types of synthetic resins are injected.

7 (A) and 7 (B) are cross-sectional explanatory views showing a state in which a synthetic resin is injected from the first gate to the back surface of some plastic sheet materials.

8 (A) and 8 (B) are cross-sectional explanatory views showing a state where a different synthetic resin is injected from the second gate to mold the press button on the back surface of the remaining plastic sheet material.

FIG. 9 is an enlarged cross-sectional explanatory view illustrating a molding method of another example.

[Explanation of symbols]

 1 movable side mold plate 2 cavity 3 button forming recess 4 pattern recess 5,5a core mold plate 6 runner 7,7a, 7b sprue 8,8a, 8b gate 9 convex part 10 concave part 11,11a, 11b fixed side mold Plate 12 Sprue 13 Plastic sheet material 14 Plastic panel 15,15a Plastic protrusion 16,16a Thin plastic layer 17,17a Press button

Claims (5)

[Claims] 1. A panel using a movable template having a cavity into which a plastic sheet material can be inserted, a core template having a runner, a sprue, and a gate therein, and a stationary template having a sprue. In the method for manufacturing a button, a concave portion for forming a button is provided at the bottom of the cavity of the movable side template, a convex section that can be fitted into the concave section is provided around the gate of the core template, and the movable side template is provided. The plastic sheet material abutted against the core template is inserted into the cavity, the synthetic resin is injected from the gate of the core template, and the plastic panel is laminated on the back surface of the plastic sheet material. An electric appliance characterized in that a thin plastic layer and a plastic protrusion are provided on a back surface of a part of a sheet material to form a push button capable of being automatically restored. Manufacturing method of panel button for parts. 2. A plastic sheet in which a recessed portion is bored from the tip of a convex portion projecting on the lower surface of the core template toward the gate, and a synthetic resin is injected from the first gate of the core template. A plastic panel is laminated on the rear surface of the material, and a soft synthetic resin is injected from the second gate of the core template into the concave portion and fixed to the plastic sheet material to form a press button, and at the same time the press button is pressed. 2. The method for manufacturing a panel button for electric parts according to claim 1, wherein a soft plastic thin layer and a soft plastic protrusion are provided on the back surface of the button. 3. A second core type having a second gate different from the core template after injecting a synthetic resin from the first gate of the core template to stack a plastic panel on the back surface of the plastic sheet material. After exchanging the plate and the second cavity, the soft synthetic resin is injected from the second gate and fixed to the plastic sheet material to form the push button, and at the same time, the soft plastic thin layer and the soft plastic protrusion are formed on the back surface of the push button. 2. The method according to claim 1, wherein
Of manufacturing panel buttons for electrical parts of. 4. A plastic panel having a button hole at a predetermined position and a structure in which a plastic sheet is integrally laminated on the surface of the plastic panel, and a plastic sheet of a portion corresponding to the button hole. A panel button for electrical parts, characterized in that a thin plastic layer and a plastic projection are integrally provided on the back surface of the. 5. The electrical component according to claim 4, wherein the thin plastic layer and the plastic projection provided on the back surface of the plastic sheet in the portion corresponding to the button hole are made of soft synthetic resin. Panel button.