CN2672831Y - Single-chip circuit switch shrapnel - Google Patents

Abstract

The utility model discloses a monolithic formula circuit switch shell fragment, there is a welding section with punching mode integrated into one piece, a connection welding section end border and with the deformation buffer section of an angle extension, a connection deformation buffer section end border press the section, and two are adjoint respectively and press the opposite both sides reason of section and press an angle towards keeping away from the support section of pressing the section direction extension, make the shell fragment utilize surface adhesion method location to a circuit board on, and when pressing the section atress, the deformation buffer section produces elastic deformation, with the pushing power of absorbing to pressing the section atress back to the welding section direction, and keep the location steadiness of welding section on the circuit board.

Description

Single-chip circuit switch shrapnel

technical field

The utility model relates to a shrapnel, in particular to a shrapnel integrally formed by punching and used as a circuit switch.

Background technique

Generally, in electronic products, touch switches are widely used in the interface of human-machine communication, such as the keypad used to input numbers in mobile phones or home phones, the keyboard used to input letters and numbers in computer equipment, Even the control panels of various home appliances with microcomputer control devices, etc., can be seen in the application of touch switches.

As shown in FIG. 1 , taking the single button structure 9 of a keyboard used in a mobile phone as an example, it is one of the structures of a touch switch.

The button structure 9 is installed on a circuit board 8, and the circuit board 8 is provided with a plurality of electrical contacts 81 (only a single electrical contact 81 is shown in the figure), and the button structure 9 includes a plastic shrapnel sequentially from bottom to top 91. A silicon rubber cover 92 covered on the plastic elastic sheet 91, and a button joint 93 on the silicon rubber cover 92, wherein the bottom surface of the plastic elastic sheet 91 is provided with a conductive contact corresponding to the electrical contact 81. part 911, when the user presses down the button connector 93, and then presses the silicon rubber cover 92 and the plastic elastic sheet 91 to deform downward, the conductive part 911 of the plastic elastic sheet 91 will contact the corresponding electrical contact 81, resulting in the conduction of the circuit. An electronic signal is generated, and when the user no longer exerts any force on the button connector 93 , the conductive part 911 is separated from the corresponding electrical contact 81 by the elastic restoring force of the plastic elastic sheet 91 and resets.

However, from a manufacturing point of view, since the plastic elastic sheet 91 is not directly fixed on the circuit board 8, but a acupuncture point 921 for the plastic elastic sheet 91 is formed in advance at the corresponding position of the silicon rubber cover plate 92, and then the silicon rubber is used to The cover plate 92 and the circuit board 8 are relatively fixed to achieve the alignment effect between the plastic shrapnel 91 and the electrical contacts 81 on the circuit board 8 . The electrical contacts 81 on the circuit board, and the corresponding plastic shrapnel 91 are placed in the acupuncture points 921, so that they can be assembled to the circuit board 8. Due to the complicated process, it is difficult to automate the assembly process. At present, most of them are assembled manually, and the manufacturing cost Unable to descend. In addition, since a silicone cover 92 must be provided, the cost of materials is also increased, and the more components there are, the more difficult it is to comply with the trend of thinning in product design.

In addition, taking the keyboard used in general computer equipment as an example is another application of the touch switch. And the button structure of the keyboard that computer equipment is used is more complex and the number of elements is more than the button that aforementioned mobile phone is used, wherein usually there is so-called scissors type support structure in the middle of the keycap that presses for user and circuit board, or adopts Other additional support structures, etc., therefore also face the aforementioned shortcomings of being difficult to automate assembly, and the cost of materials and assembly cannot be further reduced. Since the keyboard structure of the computer equipment is not the focus of discussion in the present utility model, no further illustrations will be made. detailed instructions.

Utility model content

The purpose of this utility model is to provide a single-piece shrapnel that is integrally formed by stamping and used as a circuit switch, which can greatly reduce the production cost of electronic product components, and can be automatically welded on the circuit board by using the surface adhesion method. Additional positioning components can greatly reduce the assembly cost of electronic products.

The single-chip circuit switch shrapnel of the utility model is characterized in that: the shrapnel is integrally formed by punching, and is positioned on a circuit board by a surface adhesion method, and can be elastically reset to contact a bit on the circuit board after being stressed. The corresponding electrical contact on the upper part triggers an electronic signal by contacting the electrical contact with the shrapnel. The shrapnel includes a welding section, a pressing section, a deformation buffer section and two supporting sections. in:

The welding section is located on the side of the electrical contact and is welded on the circuit board. The deformation buffer section extends from the edge of the welding section and extends away from the welding section at an angle. The pressing section connects the deformation buffer section away from the welding section. The supporting section is adjacent to the opposite side edges of the pressing section and extends away from the pressing section at an angle, and is located on the same side of the pressing section as the deformation buffer section. In the unstressed state, the deformation buffer section and the two supporting sections jointly elastically support the pressing section, so that the pressing section maintains a distance from the electrical contact when no force is applied to withstand the pressing force approaching the circuit board, and when the pressing section is stressed and close to the circuit board The deformation buffer section produces elastic deformation to absorb the pushing force of the pressing section to the direction of the welding section, so as to maintain the stability of the welding section on the circuit board.

The single-chip circuit switch shrapnel of the utility model is directly welded on the circuit board by the welding section, and cooperates with the design of the deformation buffer section to absorb the pressing force of the pressing section and push the force toward the welding section, so that only a single shrapnel is needed. It is used as a circuit switch without other complicated positioning structures, which not only reduces the cost of materials, but also achieves the possibility of further thinning electronic products due to the reduction of its component parts. More importantly, use the adsorption device of the automation equipment to absorb the pressing section of the shrapnel, and then move the single shrapnel to any specific position on the circuit board, and use the surface adhesion method to quickly and accurately weld it on the circuit board. The surface mount technology is a very mature manufacturing process in the industry. The design of this utility model makes good use of this advantage of automation, which makes the positioning and connection of the shrapnel used as a circuit switch and the circuit board more efficient, and can also greatly save production and labor costs. The cost of assembling, so really can reach the purpose of the utility model.

In order to further understand the essence of the utility model, the shrapnel of the utility model will be described in detail below with reference to the drawings and specific embodiments.

Description of drawings

FIG. 1 is a schematic cross-sectional view of a conventional button structure;

Fig. 2 is a perspective view illustrating the shape and structure of the preferred embodiment 1 of the present invention and its relationship with the circuit traces of the electrical contacts on a circuit board;

Fig. 3 is a perspective view illustrating the circuit routing relationship between the preferred embodiment 1 and the electrical contacts on another circuit board;

Fig. 4 is a schematic side view illustrating the unstressed state of the preferred embodiment 1;

Fig. 5 is a schematic side view illustrating the state of the preferred embodiment 1 after being stressed;

Fig. 6 is a perspective view illustrating the structure of the preferred embodiment 1 with an additional contact portion;

Fig. 7 is a schematic side view illustrating the state of the shrapnel in Fig. 6 after being stressed;

Fig. 8 is a perspective view illustrating the structure of the preferred embodiment 2 of the present utility model;

Fig. 9 is a perspective view illustrating the structure of the preferred embodiment 3 of the present utility model; and

Fig. 10 is a perspective view illustrating the structure of the preferred embodiment 4 of the present utility model.

Detailed ways

Example 1

Referring to Fig. 2 and Fig. 3, the preferred embodiment 1 of the one-piece circuit switch elastic piece 5 of the present utility model is to form a monolithic structure by integrally stamping and bending the conductive metal material, so that the elastic piece 5 is applied in a circuit on the board 2, while the surface of the circuit board 2 is pre-formed with a plurality of electrical contacts 21 (only a single electrical contact 21 is represented in the figure), and on the opposite sides of the electrical contacts 21 to meet the needs of the surface mount method. Two welding pads 22 are provided on the surface of the circuit board 2 . As shown in Figure 2, one of the pads 22 is connected to a circuit trace 23, and the electrical contact 21 is formed of a single-area conductive material, which can be connected to another circuit trace 24, so that the circuit trace 23 is connected to the circuit trace. The line 24 forms a circuit break state, and the contact between the elastic piece 5 and the electrical contact 21 (the function will be described later) makes its circuit conduction to trigger an electronic signal. Also as shown in Figure 3, the electrical contact 21 can also be divided into a first conductive region 211 and a second conductive region 212 which are not connected to each other, the first conductive region 211 is connected to a circuit trace 25, and the second conductive region The area 212 is connected to another circuit trace 26, so that the circuit trace 25 and the circuit trace 26 form a circuit disconnection state, and the contact between the elastic piece 5 and the electrical contact 21 can also be used (that is, the contact between the first conductive region 211 and the first conductive region 211 at the same time). the second conductive region 212) to conduct the circuit to trigger an electronic signal. Of course, there are other types of electrical contacts 21 , and only two examples are given here for illustration, not to limit the scope of application of the elastic piece 5 of the present invention.

As shown in FIG. 2 and FIG. 4 , the elastic piece 5 of the present invention includes two welding sections 51 , 56 , two deformation buffer sections 53 , 55 , a pressing section 52 and two supporting sections 54 .

The welding section 51 is roughly parallel to the extending direction of the plane of the circuit board 2, so that the two welding sections 51, 56 are spaced apart from the welding pads 22 on the opposite sides of the electrical contact 21 on the circuit board 2, and can be bonded to each other by surface adhesion. The corresponding welding pads 22 are welded, so that the welding sections 51 , 56 can be fixed on the circuit board 2 .

The two deformation buffer sections 53 , 55 respectively extend upward from the opposite end edges of the corresponding welding sections 51 , 56 in a direction away from the welding sections 51 , 56 . In this example, the deformation buffer section 53 has a curved portion 531 extending inwardly from the opposite end edge of the welding section 51, and an upright portion 532 connected to the curved portion 531 and extending upward. The curved portion 531 is in an inverted U shape. The cross-sectional shape is formed by bending. And the deformation buffer section 55 also adopts the same form.

The opposite sides of the pressing section 52 are respectively connected to the end edges of the upright portions of the deformation buffering sections 53 , 55 away from the welding sections 51 , 56 . In this example, the extending direction of the pressing section 52 is roughly parallel to the extending direction of the plane of the circuit board 2, and its purpose is to withstand the pressing force close to the circuit board 2, but the pressing section 52 is kept with the circuit board 2 in the unstressed state. There is a distance, at this time, the circuit connected to the electrical contact 21 on the circuit board 2 is in an open circuit state.

The supporting section 54 is connected to the opposite side edges of the pressing section 52 that are not connected with the deformation buffer sections 53, 55, and extends outward and downward at an inclined angle respectively. The lower free ends of the two supporting sections 54 only touch the The circuit board 2 is on the surface but not fixed with the circuit board 2 , so that the deformation buffer sections 53 , 55 and the two support sections 54 elastically support the pressing section 52 above the circuit board 2 .

Referring to FIG. 5 at the same time, when the pressing section 52 is subjected to a downward pressure as shown by the solid line arrow (for example, when the user presses the button), the pressing section 52 will bend and deform downward to contact the electrical contact 21. , by virtue of the conductive property of the material of the elastic piece 5 itself, the circuit on the circuit board 2 is conducted to generate an electronic signal. On the other hand, since the welding section 51 is fixed on the circuit board 2, and when the pressing section 52 is bent and deformed under a force, there will be forces pushed in the direction of the side welding section 51 as shown by the dotted arrows in the figure. The connection stability between the section 51 and the welding pad 22 is damaged by the lateral shear force, and the deformation buffer section 53 plays a role at this time. Absorb most of the pushing force, so that the welding section 51 can be firmly positioned on the circuit board 2 , and the deformation buffer section 55 also has the same effect, so that the welding section 56 can be stably positioned on the circuit board 2 . At the same time, the support section 54 can also produce elastic deformation so that its free end stretches away from the pressing section 52, which has the function of strengthening the elastic reset of the pressing section 52. In addition, the supporting section 54 will produce a deformation during the deformation and recovery process. The sound of "answer, answer", when the shrapnel 5 is applied to the keyboard structure, can constitute a similar sound effect as a traditional keyboard when hitting a word key. And when the force on the pressing section 52 disappears, it can return to its original shape based on the elastic recovery property of the material of the elastic piece 5 .

As shown in Figures 6 and 7, in order to further increase the reliability of the electrical contact between the pressing section 52 and the electrical contact 21, a one-to-two welding section can be punched out at the center of the pressing section 52 when the elastic piece 5 is stamped and formed. The contact portion 521 protruding in the direction of the lower circuit board 2 in the middle of 51 and 56, when the pressing section 52 is stressed and approaches the circuit board 2, the contact portion 521 contacts the electrical contact 21 to ensure that the two are in contact position. accuracy.

Example 2

As shown in Figure 8, it is the shrapnel 5 of the preferred embodiment 2 of the present utility model, and its structure mainly omits the deformation buffer section 55 and the welding section 56 on the side of the pressing section 52 of the preferred embodiment 1 (can be compared with that shown in Figure 6 (shown), so that the pressing section 52 is only supported by a deformation buffer section 53 and two support sections 54 to form a three-point support, and the rest of the structure is the same as that of the preferred embodiment 1.

Example 3 and Example 4

Referring again to Fig. 9 and Fig. 10, it is the shrapnel 6 of the preferred embodiment 3 and embodiment 4 of the present utility model, its structure can be compared with Fig. 6 and Fig. 8 respectively, but the difference lies in the deformation buffer section 63 or the deformation buffer section 65 The form is in an outwardly stretched arc shape, and the deformation buffer sections 63 and 65 are directly in an arc shape from the opposite end edges of the welding section 61 to connect the corresponding end edges of the pressing section 62 .

By changing the arc curvature of the deformation buffer section 63 or 65, it is also possible to absorb the pushing force of the pressing section 62 toward the welding section 61 or 66, so that each welding section 61 or 66 has a better connection on the circuit board stability. The structures and functions of the remaining parts are the same as those of the aforementioned preferred embodiments. For example, the pressing section 62 can also be changed in shape to form different appearances such as a circle.

Claims (6)

1, a kind of one chip contactor shell fragment, the distortion breeze way, that includes a welding section, this welding section of connection connects the section of pushing of this distortion breeze way, and the hold segment of two these sections of pushing of connection, it is characterized in that:

This distortion breeze way is to extend from the ora terminalis of this welding section and press from both sides an angle towards extending away from this welding section direction, this section of pushing is the ora terminalis away from this welding section that connects this distortion breeze way, this two hold segment is then respectively in abutting connection with this section of pushing two opposite sides edge and press from both sides an angle towards extending away from this section of pushing direction again, and with the same one side side of this distortion breeze way coordination in this section of pushing.

2, one chip contactor shell fragment as claimed in claim 1 is characterized in that: this distortion breeze way has a bend from this welding section ora terminalis bending extension, and the erection part of this bend of connection and this section of pushing ora terminalis.

3, one chip contactor shell fragment as claimed in claim 2 is characterized in that: this bend be with a reverse U shape cross section kenel bending constitute.

4, one chip contactor shell fragment as claimed in claim 1 is characterized in that: this distortion breeze way be directly from this welding section in opposite directions the curved state of ora terminalis to connect this corresponding section of pushing ora terminalis.

5, one chip contactor shell fragment as claimed in claim 1 is characterized in that: this section of pushing is provided with a contact site that is standing shape to this welding section and hold segment third side to dashing.

6, one chip contactor shell fragment as claimed in claim 1 is characterized in that: this section of pushing more is provided with a distortion breeze way and a welding section of same modality at opposite another ora terminalis that connects this distortion breeze way.

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