TWI401715B - Button module and digital device having the same - Google Patents

Description

Button module and digital device having the same

The invention relates to a button module, in particular to a button module which is easy to assemble and a digital device having the button module.

With the rapid development of digital technology, digital products such as computers and mobile phones are playing an increasingly important role in people's daily life and automated production. The control and data input to computers, mobile phones, etc. are mainly realized by buttons, and thus the importance of the buttons is unquestionable.

The buttons of the previous digital device often have metal shrapnel. During operation, the metal shrapnel is deformed by force and electrically connected between the two contacts of the circuit, thereby realizing data input. When the external force disappears, the shrapnel recovers. When the button is assembled, it is necessary to place the metal domes one by one at a predetermined position of the circuit, which will consume a lot of manpower and time. Moreover, the metal shrapnel is light and thin, and when assembled, a phenomenon in which a plurality of metal shingles stacked on each other are placed at a predetermined position often occurs, which is disadvantageous for improving the assembly yield. In addition, the metal shrapnel has a certain service life, and after a plurality of presses, fatigue phenomenon will occur, which is not conducive to improving the service life of the button.

In view of the above, it is necessary to provide a button module that is easy to assemble and a digital device having the button module to improve assembly efficiency and provide a long service life.

A button module includes a first magnetic plate, a circuit board, a partition plate and a second magnetic plate which are sequentially disposed. The circuit board has a plurality of button contacts, each button contact including a first contact and a second contact spaced apart from each other. The spacer has a plurality of through holes corresponding to the plurality of button contacts in one-to-one correspondence. Each button contact is exposed to a corresponding through hole. The second magnetic plate is configured to generate a mutually repulsive magnetic force with the first magnetic plate. The second magnetic plate has a plurality of conductive protrusions corresponding to the plurality of button contacts, and each of the conductive protrusions extends into a corresponding one of the through holes of the spacer and is exposed to the through hole The button contacts are opposite to each other, and each of the conduction protrusions is configured to contact the button contact opposite to the conduction protrusion under the action of the pressing external force, and electrically connect the first contact and the second contact.

A digital device includes a housing and a button module as described above. The housing has a plurality of pressing structures. The plurality of pressing structures are in one-to-one correspondence with the plurality of conductive protrusions for conducting the pressing external force to the plurality of conductive protrusions.

The button module of the present technical solution has a first magnetic plate and a second magnetic plate, and the second magnetic plate has a conduction protrusion opposite to the button contact. The mutually repulsive magnetic force between the first magnetic plate and the second magnetic plate causes the conductive protrusion on the second magnetic plate to automatically come out of contact with the button contact when the pressing action disappears. The digital device with the button module has a simple structure, is easy to assemble, and has a long service life.

The button module provided by the technical solution and the digital device having the button module will be further described in detail below with reference to the accompanying drawings and the embodiments.

Referring to FIG. 1 to FIG. 4 , the first embodiment of the present invention provides a button module 10 including a first magnetic plate 11 , a circuit board 12 , a partition plate 13 , and a second magnetic plate 14 . The first magnetic plate 11, the circuit board 12, the spacer 13 and the second magnetic plate 14 may be fixed together by an adhesive, a screw or the like.

The first magnetic plate 11 is a plastic magnet, which may be a rectangular parallelepiped plate body. The first magnetic plate 11 is a composite magnetic polymer, that is, a mixture of a high molecular polymer and a permanent magnetic material. The first magnetic plate 11 may be first mixed with a rare earth permanent magnet material, a metal permanent magnet material or a ferrite permanent magnet material, and then formed by extrusion molding, injection molding, calender molding or compression molding. . In the above process, the magnetic field of the permanent magnet material to be added may be sequentially arranged by an external magnetic field or a mechanical force, so that the obtained first magnetic plate 11 has strong magnetic properties. The first magnetic plate 11 has a first magnetic surface 110 and a second magnetic surface 111 opposite to each other. In this embodiment, the first magnetic plate 11 is a mixed barium ferrite (mSrO·nFe 2 O 3 ) permanent magnet material in polyamine, and is adjacent to the first magnetic surface 110 as an N pole of the first magnetic plate 11 . Near the second magnetic surface 111 is the S pole of the first magnetic plate 11.

The shape of the circuit board 12 corresponds to the shape of the first magnetic plate 11, and is also a rectangular parallelepiped plate body. The circuit board 12 includes a first cover layer 120, a first conductive pattern layer 121, an insulating layer 122, a second conductive pattern layer 123, and a second cover layer 124 which are sequentially stacked. The first cover layer 120 is adjacent to the first magnetic plate 11 and is in contact with the second magnetic surface 111. The first cover layer 120 is for protecting the first conductive pattern layer 121. The second cover layer 124 is away from the first magnetic plate 11 . The second cover layer 124 is for protecting the second conductive pattern layer 123. The first cover layer 120 and the second cover layer 124 may both be made of an insulating material. In this embodiment, the second cover layer 124 is a transparent material. The first conductive pattern layer 121 includes a plurality of first conductive lines 125. The insulating layer 122 has a plurality of via holes 126 that are in one-to-one correspondence with the plurality of first conductive lines 125. Each via 126 is connected to a first conductive line 125. The second conductive pattern layer 123 includes a plurality of button contacts 127 and a plurality of second conductive lines 128. The second cover layer 124 covers the plurality of second conductive lines 128 of the second conductive pattern layer 123 and exposes the plurality of button contacts 127. The plurality of first conductive lines 125 and the plurality of second conductive lines 128 are all connected to a microprocessor to realize identification and input of key content. Each of the button contacts 127 includes a first contact 1270 and a second contact 1271 that are spaced apart from each other. The first contact 1270 of each button contact 127 is connected to a first conductive line 125 by a via hole 126. The second contact 1271 surrounds the first contact 1270. Each of the second conductive lines 128 is connected to a second contact 1271. In this embodiment, the number of the plurality of button contacts 127 is twelve, and is divided into three rows and four columns, arranged in an array. Of course, the distribution of the plurality of button contacts 127 can also be changed according to the actual needs of the digital product structure. In this embodiment, each of the button contacts 127 has a concentric shape, that is, the first contact 1270 is circular at the center, and the second contact 1271 is annular around the first contact 1270.

Of course, the circuit board 12 can also have other structures, and the button contacts 127 can also have other structures. For example, the circuit board 12 may include only one insulating layer and one layer of a conductive pattern layer formed on the insulating layer. The conductive pattern layer may include a plurality of button contacts and a plurality of conductive lines, each of which includes The first contact and the second contact, the first contact and the second contact may both be a conventional comb circuit structure, and the comb circuit structure of the first contact and the comb circuit structure of the second contact are mutually Cross settings.

The spacer 13 is located on a side of the circuit board 12 away from the first magnetic board 11. Corresponding to the shape of the first magnetic plate 11, the partition plate 13 is also a rectangular parallelepiped plate body. The spacer 13 may have a thickness of from 180 mm to 200 μm, preferably 188 μm. The spacer 13 may be made of polyester having a first spacing surface 130 and a second spacing surface 131, wherein the first spacing surface 130 is adjacent to the circuit board 12 and the second covering The layers 124 are in contact with each other, and the second spacing surface 131 is remote from the circuit board 12. The partition plate 13 has a plurality of through holes 132 extending through the first spacing surface 130 and the second spacing surface 131. The plurality of through holes 132 are in one-to-one correspondence with the plurality of button contacts 127, and each button contact 127 Both are exposed to a corresponding via 132. In this embodiment, the through hole 132 has a circular cross section.

The second magnetic plate 14 is used to generate mutually repulsive magnetic forces with the first magnetic plate 11. The second magnetic plate 14 is also a plastic magnet, which may be a composite magnetic polymer. In this embodiment, the second magnetic plate 14 is the same composite magnetic polymer as the first magnetic plate 11, that is, a mixed barium ferrite (mSrO.nFe2O3) permanent magnet material in polyamine. The second magnetic plate 14 includes a plate body 140 , a plurality of conductive protrusions 141 , and a plurality of pressing protrusions 142 . In this embodiment, the plate body 140, the plurality of conductive protrusions 141, and the plurality of pressing protrusions 142 are integrally formed.

The shape of the plate body 140 corresponds to the shape of the first magnetic plate 11, and is also a rectangular parallelepiped plate body. The plate body 140 has a first surface 143 opposite to the partition plate 13 and is in contact with the partition plate 13 , and the second surface 144 is away from the partition plate 13 . . Near the first surface 143 is the S pole of the second magnetic plate 14, and near the second surface 144 is the N pole of the second magnetic plate 14. Of course, the magnetic pole distribution of the first magnetic plate 11 and the second magnetic plate 14 may be other manners, and only a mutual magnetic force may be generated between the first magnetic plate 11 and the second magnetic plate 14 . .

The plurality of conductive protrusions 141 extend from the first surface 143 of the board 140 and are in one-to-one correspondence with the plurality of button contacts 127. Each of the conductive protrusions 141 extends into the corresponding through hole 132 of one of the spacers 13 and is opposite to the key contact 127 exposed in the through hole 132. Each of the conduction protrusions 141 is for contacting the button contact 127 opposite to the conduction protrusion 141 under an external force, and electrically connects the first contact 1270 and the second contact 1271. The conductive protrusion 141 has a cylindrical shape and a diameter smaller than or equal to the aperture of the through hole 132 so as to be received in the through hole 132. The conductive protrusion 141 protrudes from the first surface 143 by a height of 80 micrometers to 100 micrometers. Each of the conduction protrusions 141 has a conduction end surface 145 away from the plate body 140, and a conductive layer 146 is formed on the conduction end surface 145. The conductive layer 146 may be a conductive carbon paste formed on the conduction end surface 145 by a printing process. The conductive layer 146 has a thickness of 10 micrometers to 20 micrometers.

It can be understood that if the permanent magnetic material mixed in the second magnetic plate 14 is a conductive material such as a metal permanent magnet material, so that the second magnetic plate 14 has electrical conductivity, the conductive protrusion 146 may not be formed on the conduction protrusion 141.

The plurality of pressing protrusions 142 are located on the second surface 144 of the board body 140 and are in one-to-one correspondence with the plurality of button contacts 127. The plurality of pressing protrusions 142 protrude from the second surface 144 away from the first surface 143 for marking. In this embodiment, each of the pressing protrusions 142 has a truncated cone shape. The pressing protrusion 142 protrudes from the second surface 144 to a maximum height of 50 micrometers to 100 micrometers. The numerals, letters, and the like may be formed on the plurality of pressing protrusions 142 by printing or the like. Of course, the second magnetic plate 14 may not have a plurality of pressing protrusions 142, and directly form a number, a letter, and the like at the corresponding position of the second surface 144 and the plurality of button contacts 127, directly on the second surface 144 and the The input can be realized by pressing the corresponding button contact 127 at the corresponding position.

Since the second magnetic plate 14 is S pole near the first surface 143, the first magnetic plate 11 is also adjacent to the second magnetic surface 111 of the second magnetic plate 14 as an S pole, and the first magnetic plate 11 and the second magnetic plate 14 produces mutually exclusive magnetic effects. In the case where the plurality of conduction protrusions 141 are not pressed, the plurality of conduction protrusions 141 do not come into contact with the corresponding button contacts 127. When a pressing protrusion 142 is pressed such that the external force is pressed by the magnetic force, the conduction protrusion 141 moves toward the opposite one of the button contacts 127, thereby being the first with the button contact 127. The contact 1270 and the second contact 1271 are in contact with each other and electrically connected between the first contact 1270 and the second contact 1271 of the button contact 127, and thus are electrically connected to the first conductive portion of the first contact 1270. The line 125 is electrically connected to the second conductive line 128 connected to the second contact 1271, so that the identification of the input information can be realized by the processing of the micro processing. When the pressing action disappears, the magnetic force of the repulsion causes the conduction protrusion 141 to return to the original position.

Referring to FIG. 3 and FIG. 5 together, the second embodiment of the present invention provides a digital device 100 including a display screen 101, a button module 10 of the first embodiment, a housing 102, and internal components (not shown). . The digital device 100 can be a mobile phone. The button module 10 and the internal components are disposed in the housing 102. The internal components may include conventional components of digital devices such as microprocessors, micro memories, and wireless devices. The housing 102 has a first opening 103 and a plurality of second openings 104 for exposing the display surface of the display screen 101. The second opening 104 is configured to expose a plurality of pressing protrusions 142 of the button module 10 . The button module 10 and the first opening 103 are connected by internal component signals, so that the input function of the digital device 100 can be realized by pressing the plurality of pressing protrusions 142, and the data corresponding to the input information is displayed on the display screen 101.

Certainly, those skilled in the art can understand that when the button module 10 does not press the protrusion 142, the second opening 104 exposes a portion of the button module 10 corresponding to the conduction protrusion 141, and the information input during pressing can also be realized. . In addition, the housing 102 may not be provided with the second opening 104, and an elastic pressing portion may be disposed at a portion corresponding to the second magnetic plate 14, or the housing 102 may be entirely made of a flexible material. In summary, it is only necessary for the housing 102 to have a pressing structure corresponding to the conduction protrusion 141, so that the operator can press the button module 10. The pressing structure may be the second opening 104 as shown above, may be an elastic pressing portion, and may be other structures that facilitate the pressing of the conductive protrusion 141.

The button module 10 of the present technical solution has a first magnetic plate 11 and a second magnetic plate 14, and the second magnetic plate 14 has a conduction protrusion 141 opposite to the button contact 127. The mutually repulsive magnetic force between the first magnetic plate 11 and the second magnetic plate 14 causes the conduction protrusions 141 on the second magnetic plate 14 to automatically come out of contact with the key contacts 127 when the pressing action disappears. The digital device 100 having the button module 10 has a simple structure, is easy to assemble, and has a long service life.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by persons skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims.

10‧‧‧Key Module

11‧‧‧First magnetic board

110‧‧‧First magnetic surface

111‧‧‧Second magnetic surface

12‧‧‧ boards

120‧‧‧First cover

121‧‧‧First conductive pattern layer

122‧‧‧Insulation

123‧‧‧Second conductive pattern layer

124‧‧‧Second overlay

125‧‧‧First conductive line

126‧‧‧through holes

127‧‧‧Key contacts

1270‧‧‧First contact

1271‧‧‧second contact

128‧‧‧Second conductive line

13‧‧‧ Spacer

130‧‧‧First interval surface

131‧‧‧Second spacing surface

132‧‧‧through hole

14‧‧‧Second magnetic board

140‧‧‧ board

141‧‧‧ conduction bulge

142‧‧‧ Pressing the bulge

143‧‧‧ first surface

144‧‧‧ second surface

145‧‧‧Connecting end face

146‧‧‧ Conductive layer

100‧‧‧ digital devices

101‧‧‧ display screen

102‧‧‧ housing

103‧‧‧First opening

104‧‧‧second opening

FIG. 1 is a schematic structural diagram of a button module provided by a first embodiment of the present technical solution.

FIG. 2 is an exploded view of the above button module.

Figure 3 is a partial cross-sectional view taken along line III-III of Figure 1.

Figure 4 is a partial enlarged view of the portion IV in Figure 2.

FIG. 5 is a schematic structural diagram of a digital device according to a second embodiment of the present technical solution.

10‧‧‧Key Module

11‧‧‧First magnetic board

12‧‧‧ boards

120‧‧‧First cover

122‧‧‧Insulation

124‧‧‧Second overlay

13‧‧‧ Spacer

14‧‧‧Second magnetic board

142‧‧‧ Pressing the bulge

Claims (13)

A button module includes a first magnetic plate, a circuit board, a spacing plate and a second magnetic plate arranged in sequence, the circuit board having a plurality of key contacts, each of the key contacts comprising a first contact spaced apart from each other a second contact, the spacer has a plurality of through holes corresponding to the plurality of button contacts, each button contact is exposed to a corresponding through hole, and the second magnetic plate is used for The first magnetic plate generates mutually repulsive magnetic forces, and the second magnetic plate has a plurality of conductive protrusions corresponding to the plurality of button contacts, each of the conduction protrusions extending to one of the corresponding ones of the spacer plates The hole is opposite to the button contact exposed in the through hole, and each of the conduction protrusions is configured to contact the button contact opposite to the conduction protrusion under the action of the pressing external force, and electrically connect the first contact with Second contact. The button module of claim 1, wherein the first magnetic plate and the second magnetic plate are both plastic magnets, both of which are made of a composite magnetic polymer. The key module of claim 2, wherein the composite magnetic polymer is a mixture of a high molecular polymer and a permanent magnet material, and the permanent magnetic material is a rare earth permanent magnet material and a metal permanent magnet material. Or ferrite permanent magnet material. The button module of claim 1, wherein each of the conduction protrusions is provided with a conductive carbon paste near a surface of the button contact. The button module of claim 1, wherein the second magnetic plate has an opposite first surface and a second surface, the first surface is adjacent to the partition plate, and the second surface is away from The plurality of conductive protrusions extend from the first surface toward the circuit board, and the second surface is provided with a plurality of pressing protrusions extending away from the circuit board. The plurality of pressing protrusions are in one-to-one correspondence with the plurality of button contacts. The button module of claim 1, wherein the circuit board comprises a first conductive pattern layer and a second pattern layer, the first conductive pattern layer being adjacent to the first magnetic board, the plurality The button contacts are all located on the second conductive pattern layer, the first conductive pattern layer has a plurality of first conductive lines corresponding to the plurality of button contacts, and each of the first conductive lines is electrically connected to the first The second conductive pattern layer further has a plurality of second conductive lines connected to the plurality of second contacts, each of the conductive protrusions being pressed by the external force and being opposite to the conductive protrusion When the first contact and the second contact are contacted and electrically connected, a first conductive line and a second conductive line are electrically connected correspondingly. The switch module of claim 6, wherein the circuit board further comprises an insulating layer between the first conductive pattern layer and the second pattern layer, wherein the insulating layer is provided with a plurality of via holes The plurality of vias are in one-to-one correspondence with the plurality of button contacts, and each of the first conductive lines is electrically connected to a first contact via a via. The button module of claim 1, wherein the first contact and the second contact are comb circuit structures, and the comb circuit structure of the first contact and the second contact The comb circuit structures are arranged to cross each other. The button module of claim 1, wherein the first magnetic plate, the circuit board, the spacer, and the second magnetic plate are fixed together by screws. A digital device, comprising: a housing and a button module according to any one of claims 1 to 9, wherein the housing has a plurality of pressing structures, and the plurality of pressing structures are in one-to-one correspondence with the plurality of conductive protrusions For conducting the pressing external force to the plurality of conducting protrusions. The digital device of claim 10, wherein the housing has a first opening, the plurality of pressing structures are a plurality of second openings, and the digital device further includes a display screen, the display screen The display surface is exposed to the first opening. The digital device of claim 11, wherein the second magnetic plate has an opposite first surface and a second surface, the first surface is adjacent to the partition plate, and the second surface is away from the In the spacer, the plurality of conductive protrusions extend from the first surface toward the circuit board, and the second surface is provided with a plurality of pressing protrusions extending away from the circuit board. The plurality of pressing protrusions are in one-to-one correspondence with the plurality of button contacts, and the plurality of pressing protrusions are exposed to the plurality of second openings. The digital device of claim 10, wherein the plurality of pressing structures are a plurality of elastic pressing portions.