CN105655173A

CN105655173A - Weld-leg internally-installed surface-mounted elastic key and manufacturing method thereof

Info

Publication number: CN105655173A
Application number: CN201610186168.5A
Authority: CN
Inventors: 郑建娜; 杨笛
Original assignee: Guilin Xuyan Electromechanical Technology Co Ltd
Current assignee: Guilin Xuyan Electromechanical Technology Co Ltd
Priority date: 2016-03-29
Filing date: 2016-03-29
Publication date: 2016-06-08
Anticipated expiration: 2036-03-29
Also published as: CN105655173B

Abstract

The invention discloses a weld-leg internally-installed surface-mounted elastic key and a manufacturing method thereof. The key comprises a base and a key soft body. The key soft body comprises a key convex body, an elastic soft main body and a conductive contact. The elastic soft main body is in a conical cylinder shape, the small-opening inner edge of the elastic soft main body is connected with the key convex body, the large opening end of the elastic soft main body is connected with the upper surface of the base, and a through hole corresponding to the large opening end of the elastic soft main body in size is formed in the middle of the base; the conductive contact is arranged on the lower end face of the key convex body; protruding-downwards weld legs are arranged on the bottom end face of the base and are not exposed out of the outer side of the base, and the lower end faces and the periphery faces of the weld legs are the weld faces. A key lead is good in coplanarity, and the requirements of the size, the shape and the number of the different key leads can be met; the weld-leg internally-installed surface-mounted elastic key is applied to surface mounting application, and has the advantages of being low in manufacturing cost and good in practicability; by means of the key, gapless arrangement can be achieved, and particularly, the key has the prominent advantages in high-density product application occasions and high-integration-density product application occasions.

Description

SMD flexible keypad that a kind of leg is built-in and preparation method thereof

Technical field

The present invention relates to the structure of macromolecular elastomer button and manufacturing technology, SMD flexible keypad that specifically a kind of leg is built-in and preparation method thereof.

Background technology

Conductive rubber key industry is the industry being born in the eighties of last century 80-90 age. The problem not being suitable for surface mount process for traditional non-standard monomer silica gel push-button, the silica gel push-button of surface-adhered type is suggested, and namely adds pin support at silica gel push-button base, by embossing the SMD silica gel push-button of a set of formation; But, on the one hand in process of production, the existing silica gel push-button with Surface Mount pin, it is to avoid pin does not bend technique, not only causes complex manufacturing technology, and lead coplanarity is difficult to control to; On the other hand in the application scenario of high density, high integration, owing to being exposed to button edge when pin welds, it is impossible to accomplish gapless high-density applications demand.

Summary of the invention

The order of the present invention is for the deficiencies in the prior art, and provides built-in SMD flexible keypad of a kind of leg and preparation method thereof. This button leg is hidden, it is adaptable to surface mounting technology, the advantage with high density, cheap for manufacturing cost, applied range; This manufacture method, by the direct built-in leg of formation on leg link, once forms SMD silica gel push-button in the auxiliary of leg protecting film, it is to avoid leg bends technique, improves the coplanarity controllability of leg simultaneously.

The technical scheme realizing the object of the invention is:

The SMD flexible keypad that a kind of leg is built-in, including base and button software, described button software includes key convex body, elastic soft and conductive contact, the conical round bar shape of elastic soft, the osculum inner edge of elastic soft is connected with key convex body, the big opening end of elastic soft is connected with base upper surface, and in the middle of base, offer the through hole of size corresponding with the big opening end of elastic soft, conductive contact is arranged on the lower surface of key convex body, unlike the prior art, described base bottom is provided with the leg down protruded, leg does not expose to chassis outer side, lower surface and the peripheric surface of described leg are solder side.

Described base is provided with leg link, and leg link is connected with the upper surface of leg.

Described leg link is encapsulated in chassis interior.

The first half of described leg is encapsulated in chassis interior.

Described leg is at least 2.

Described leg total quantity is the multiple of 2.

Described leg is symmetrical in button bottom surface sections.

Described leg only exposes the latter half of lower surface and side, and the other parts of leg are encapsulated in base.

The SMD flexible keypad manufacture method that above-mentioned leg is built-in, comprises the steps:

1) sheet metal with solderability is chosen;

2) sheet metal is carried out direct punching press or etching forming processes, obtains the leg link with leg;

3) on the leg of leg link, on leg, protecting film is formed through bonding, spraying or die press technology for forming;

4) on leg link, carry out silica gel heat pressure or silica gel injection moulding forms the SMD silicone elastomer key semi-finished product that leg is built-in;

5) protecting film of leg on semi-finished product is removed, obtain the SMD silicone elastomer button that leg is built-in.

The described sheet metal with solderability is the metallic plate electroplated and had solderable coating.

This button lead coplanarity is good, it is possible to the requirement of simple realization different key pin size, shape and quantity; This button is not only applicable to surface mount application, has again advantage cheap for manufacturing cost, that practicality is good; Use additionally, this button can realize gapless arrangement, in the products application occasion of high density, high integration, there is prominent advantage especially.

This manufacture method is in advance formed directly into built-in leg on leg link, not only achieves leg built-in, and avoids leg and bend processing step, improves coplanarity and the controllability thereof of built-in leg. This manufacture method technological process is simple, low production cost, it is adaptable to produce in enormous quantities. The button that the method realizes is applicable to surface mounting technology, has that leg is hidden, a feature of high density, cheap for manufacturing cost, applied range.

Accompanying drawing explanation

Fig. 1-Fig. 5 schematically shows the method that the embodiment of the present invention makes SMD flexible keypad;

Fig. 6 is the elevational schematic view of Fig. 5;

Fig. 7 is the schematic top plan view of Fig. 5;

Fig. 8 is the schematic front view of the sectional median plane of Fig. 5.

In figure, 1. sheet metal 2. leg link 3. leg 4. protecting film 5. key convex body 6. elastic soft 7. base 8. conductive contact.

Detailed description of the invention

Below in conjunction with drawings and Examples present disclosure made further to elaboration, but be not limitation of the invention.

Embodiment:

Referring to Fig. 5-8, the SMD flexible keypad that a kind of leg is built-in, including base 7 and button software, described button software includes key convex body 5, elastic soft 6 and conductive contact 8, the conical round bar shape of elastic soft 6, the osculum inner edge of elastic soft 6 is connected with key convex body 5, the big opening end of elastic soft 6 is connected with base 7 upper surface, and in the middle of base 7, offer the through hole of size corresponding with the big opening end of elastic soft 6, conductive contact 8 is arranged on the lower surface of key convex body 5, the leg 3 down protruded it is provided with bottom described base 7, leg 3 does not expose to outside base 7, lower surface and the peripheric surface of described leg 3 are solder side.

Described base 7 is provided with leg link 2, and leg link 2 is connected with the upper surface of leg 3, thus can be embedded in inside base 7 by leg 3 simply in moulding process, it is achieved the built-in effect of leg 3.

It is internal that described leg link 2 is encapsulated in base 7.

It is internal that the first half of described leg 3 is encapsulated in base 7, so that leg 3 is formed integrated with base 7, simultaneously facilitates the face of weld realizing leg 3 and exposes, it is possible to controls the coplanarity of button leg 3 simply well;

Described leg 3 is at least 2.

Described leg 3 total quantity is the multiple of 2.

Described leg 3 is symmetrical in button bottom surface sections, it is simple to realize balance when button uses.

Described leg 3 only exposes the latter half of lower surface and side, and leg 3 down vertically protrudes bottom base 7, and the other parts of leg 3 are encapsulated in base 7, thus realizing controlling the lower surface of leg 3 and surrounding is solder side.

Between multiple legs 3, if leg link 2 is designed as open circuit, then realize the electrical open between leg 3.

1) sheet metal 1 with solderability is chosen, as shown in Figure 1;

2) sheet metal 1 is carried out direct punching press or etching forming processes, obtains the leg link 2 with leg 3, as shown in Figure 2;

3) on the leg 3 of leg link 2, on leg 3, protecting film 4 is formed through bonding, spraying or die press technology for forming, as shown in Figure 3;

4) on leg link 2, carry out silica gel heat pressure or silica gel injection moulding forms the SMD silicone elastomer key semi-finished product that leg 3 is built-in, as shown in Figure 4;

5) protecting film 4 of leg on semi-finished product 3 is removed, obtain the SMD silicone elastomer button that leg is built-in, as shown in Figure 5.

The described sheet metal 1 with solderability is the metallic plate electroplated and had solderable coating.

In step 5), SMD silicone elastomer button is carried out burr removing shaping after removing by protecting film.

Claims

1. the SMD flexible keypad that a leg is built-in, including base and button software, described button software includes key convex body, elastic soft and conductive contact, the conical round bar shape of elastic soft, the osculum inner edge of elastic soft is connected with key convex body, the big opening end of elastic soft is connected with base upper surface, and in the middle of base, offer the through hole of size corresponding with the big opening end of elastic soft, conductive contact is arranged on the lower surface of key convex body, it is characterized in that, described base bottom is provided with the leg down protruded, leg does not expose to chassis outer side, lower surface and the peripheric surface of described leg are solder side.

2. the SMD flexible keypad that leg according to claim 1 is built-in, is characterized in that, described base is provided with leg link, and leg link is connected with the upper surface of leg.

3. the SMD flexible keypad that leg according to claim 2 is built-in, is characterized in that, described leg link is encapsulated in chassis interior.

4. the SMD flexible keypad that leg according to claim 1 is built-in, is characterized in that, the first half of described leg is encapsulated in chassis interior.

5. the SMD flexible keypad that leg according to claim 1 is built-in, is characterized in that, described leg is at least 2.

6. the SMD flexible keypad that leg according to claim 5 is built-in, is characterized in that, described leg total quantity is the multiple of 2.

7. the SMD flexible keypad that leg according to claim 5 is built-in, is characterized in that, described leg is symmetrical in button bottom surface sections.

8. the SMD flexible keypad that leg according to claim 1 is built-in, is characterized in that, described leg only exposes the latter half of lower surface and side, and the other parts of leg are encapsulated in base.

9. the SMD flexible keypad manufacture method that leg is built-in, is characterized in that, comprise the steps:

1) sheet metal with solderability is chosen;

10. the SMD flexible keypad manufacture method that leg according to claim 9 is built-in, is characterized in that, in step 5), SMD silicone elastomer button is carried out burr removing shaping after removing by protecting film.