WO2018157530A1 - Inductive side key and terminal device - Google Patents

Abstract

The present invention relates to the technical field of pressure keys, and provided thereby are an inductive side key and a terminal device. In the process wherein the key is inserted into an installation groove, a flexible circuit board does not easily deform. The inductive side key provided by the present invention comprises a support plate and a flexible circuit board provided with an inductive coil. The support plate comprises a plate body made of a hard insulating material, and the flexible circuit board is fixed to at least one side surface of the plate body; the plate body is provided with a fixing table made of an elastic material on a surface thereof for fixing the flexible circuit board, and the thickness of the fixing table is greater than that of the flexible printed circuit board. The present invention may be used for pressure keys.

Description

Inductive side button and terminal device

The present application claims priority to Chinese Patent Application No. JP-A No. No. No. No. No. No. No. No. No. No. No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No

Technical field

The present invention relates to the field of pressure button technology, and in particular, to an inductive side button and a terminal device.

Background technique

In recent years, virtual pressure button technology has been widely used in terminal devices such as mobile phones. It is an important direction for innovative design of mobile devices and other terminal devices. It has various application scenarios, such as replacing volume buttons, power buttons, added potential buttons, etc. . The virtual pressure buttons are divided into many types according to the realization principle, such as capacitive, resistive, and inductive, and the inductive pressure button is one of them.

Referring to FIG. 1 , the existing terminal device (such as a mobile phone) includes a metal frame 01. The metal frame 01 is provided with a mounting slot 02 along the thickness direction of the terminal device, and an inductive side button is inserted into the mounting slot 02. 03 (inductive pressure button), wherein the inductive side button 03 comprises a flexible circuit board 031 provided with an inductive coil, and the flexible circuit board 031 is pasted with memory foam 032 on both sides in the thickness direction, the memory foam 032 and The side walls of the mounting groove 02 are closely fitted, and the flexible circuit board 031 is electrically connected to the main board of the terminal device through a connector.

When the pressing is required, the finger presses the metal frame 01 corresponding to the mounting slot 02, and the pressing of the finger causes the metal frame 01 to be slightly deformed. The deformation causes the side wall of the mounting slot 02 to approach the inductive coil on the flexible circuit board 031, and the inductance. The coil can recognize whether or not the metal object is in proximity, that is, whether the pressing is generated, and further determine whether there is a key operation. The following is the principle of the inductive pressure button, as shown in Figure 2 is the equivalent circuit diagram of the inductor and metal object (such as conductive plate or metal shell): inductor Ld and resistor Rs (inductor coil equivalent is the inductor and parasitic resistance in series The capacitors are composed of a resonant circuit connected in parallel, the circuit having a certain resonant frequency. As shown in Figure 3 (U stands for metal object; V stands for inductor coil; M stands for coupling between metal object and inductor coil). When the button needs to be pressed, the finger applies force to force the metal object to approach the inductor coil. The generated high-frequency magnetic field generates eddy currents on the surface of the metal object (indicated by arrow a in the figure), and the induced magnetic field generated by the eddy current reacts to the inductor coil, so that the oscillation capability of the resonant circuit is attenuated, and the equivalent inductance of the new inductor coil is formed. The parasitic resistance value produces a new parallel resonant circuit. The main board can determine whether the metal object is close (ie, whether the pressing is generated) by judging the difference between the front and rear resonant frequencies, and then determine whether there is a key action.

In the process of inserting the inductive side key 03 into the mounting slot 02, as shown in FIG. 1, the inductive side key 03 needs to be clamped by the clamp first, so that the memory foam 032 is thinned by pressing, and then needs to be within 3 seconds. The extruded inductive side key 03 is inserted into the mounting slot 02, and then waits for 10 seconds. After the memory foam 032 resumes expansion, the inductive side key 03 is fixed in the mounting slot by the pressing force of the memory foam 032. 02. Since the flexible circuit board 031 is affixed with the memory foam 032 on both sides in the thickness direction, the memory foam 032 needs to be squeezed and expanded during the mounting process, so that the memory foam 032 is easily flexible during the extrusion and expansion process. The circuit board 031 is deformed, and after the deformed flexible circuit board 031 is inserted into the mounting groove 02, the distance between the flexible circuit board 031 and the side wall of the mounting groove 02 is inconsistent, thereby affecting the induction pressing action of the flexible circuit board 031.

Summary of the invention

The invention provides an inductive side key and a terminal device. In the process of inserting the inductive side key into the mounting slot, the flexible circuit board is not easily deformed, thereby ensuring the distance of the flexible circuit board to the sidewall of the mounting slot. consistency.

In order to achieve the above object, embodiments of the present invention adopt the following technical solutions:

In a first aspect, an embodiment of the present invention provides an inductive side key comprising a support plate and a flexible circuit board provided with an inductive coil, the support plate comprising a plate body made of a hard insulating material, the flexibility The circuit board is fixed on at least one side surface of the board body, and the board body is fixed on the surface of the flexible circuit board with a fixing base made of an elastic material, and the fixing platform has a thickness larger than the Thickness of flexible circuit board

In the inductive side button provided by the embodiment of the present invention, since the thickness of the fixing table is greater than the thickness of the flexible circuit board, after the inductive side key is inserted into the mounting slot, the surface of the fixing table away from the board body is matched with the inner wall of the mounting slot. In contact, the flexible circuit board and the inner wall of the mounting groove are separated by a distance, so that the flexible circuit board can determine whether there is a pressing action by detecting whether the inner wall of the mounting groove changes its distance. In addition, the thickness of the fixing table is greater than the thickness of the flexible circuit board, so that the flexible circuit board can be prevented from being damaged by contact friction with the inner wall of the mounting groove, thereby ensuring the normal operation of the flexible circuit board; since the fixing table is made of an elastic material Thus, the elastic contraction of the fixing table enables the inductive side key to be smoothly inserted into the mounting groove, and the pressing force of the fixing table caused by the pressing of the inner wall of the mounting groove enables the fixing table and the inner wall of the mounting groove to be tightly fitted, thereby Realizing the fixing of the inductive side key in the mounting groove; since the flexible circuit board is fixed on at least one side surface of the board body, the fixing table is fixed on the surface of the board body for fixing the flexible circuit board, instead of being disposed in the flexible On the circuit board, during the insertion of the inductive side key into the mounting slot, the pressing force generated by the elastic contraction of the fixing table acts on the surface of the board instead of the surface of the flexible circuit board, so that the flexible circuit board does not Deformed by the compression caused by the elastic contraction of the fixing table, after the flexible circuit board is inserted into the mounting groove, the side of the flexible circuit board is to the side wall of the mounting groove It can be held away from the consistent and stable, thereby preventing the flexible circuit board sensing performance is affected.

In conjunction with the first aspect, in a first possible implementation of the first aspect, the flexible circuit board is adhered to a surface of the board by a backing.

The flexible circuit board can also be fixed to the board body by screws. Compared with the way of fixing the screws on the board body, the flexible circuit board is glued to the surface of the board body by the adhesive, which can reduce the number of parts, and can also reduce the number of parts. Convenient for the flexible circuit board to be removed from the board.

In conjunction with the first possible implementation of the first aspect, in a second possible implementation manner of the first aspect, the board is configured to fix a surface of the flexible circuit board with a positioning post, the flexible A positioning hole is defined in the circuit board, and the positioning post fits through the positioning hole. In this way, when the flexible circuit board is pasted with the board body, the positioning of the flexible circuit board can be conveniently realized by the cooperation of the positioning post and the positioning hole.

With reference to the first aspect or the first to second possible implementation manners of the first aspect, in a third possible implementation manner of the first aspect, the flexible circuit board is folded and fixed to the two sides of the board body On the opposite surface. In this way, the distance between the two sides of the flexible circuit board is equal to the inner wall of the mounting slot, and the inductance of the inductor is not affected, so that the distance between the inner walls of the mounting slots is not too small, so that the flexible circuit board can be adapted. The distance between the inner walls of both sides of the slot is currently installed without affecting the sensitivity of the induction.

In conjunction with the third possible implementation of the first aspect, a fourth possible implementation in the first aspect The flexible circuit board includes a first fold portion fixed to the first surface of the board body and a second fold portion fixed to the second surface of the board body, the first fold And the second folding portion is connected by a connecting portion, the connecting portion covers the first side edge of the plate body, and the connecting portion has a length smaller than that of the first folding portion and the second folding portion length. Since the length of the connecting portion is smaller than the length of the first folded portion and the second folded portion, when the flexible circuit board is folded, the resistance of the folding can be reduced, thereby making the flexible circuit board fold easier.

In conjunction with the fourth possible implementation of the first aspect, in a fifth possible implementation manner of the first aspect, a portion of the first side edge of the board that does not cover the connecting portion is provided with a reinforcing rib. The rib has a thickness greater than a thickness of the plate body. This can increase the strength and rigidity of the support plate, and can greatly reduce the deformation of the support plate during the insertion of the inductive side key into the mounting groove, thereby preventing the flexible circuit board from being greatly deformed.

In conjunction with the fourth possible implementation of the first aspect, in a sixth possible implementation manner of the first aspect, the first surface of the board is provided with two first fixed stations, and the flexible circuit a first folded portion of the plate is disposed between the two first fixed stages, a second second fixed surface is disposed on the second surface of the plate body, and a second folded portion of the flexible circuit board is Provided between two of the second fixed stations.

The support plate may also be configured as follows: a first fixing platform is disposed on the first surface of the plate body, and the first folding portion of the flexible circuit board is disposed on a side of the first fixing platform along the length direction of the plate body, and the plate body is The second surface is provided with a second fixing platform, and the second folding portion of the flexible circuit board is disposed on one side of the second fixing platform along the longitudinal direction of the plate body. Compared with the first surface and the second surface of the plate body, a fixing platform is disposed, and the first surface and the second surface of the plate body are provided with two fixing tables, and the first folding of the flexible circuit board The uneven portion and the second folding unevenness are located between the two fixing stages, so that the supporting plate is not easily inclined during the insertion of the supporting plate into the mounting groove, thereby making the flexible circuit board not easy to tilt, thereby ensuring the flexible circuit board to the installation. The consistency of the groove sidewall distance.

In conjunction with the first aspect or the first to second possible implementation manners of the first aspect, in a seventh possible implementation manner of the first aspect, the board body is provided with a detaching opening at at least one end of the length direction. In this way, the tool such as the tweezers can pick up the support plate from the mounting groove by clamping the disassembly port, thereby facilitating the removal and replacement of the support plate and the flexible circuit board.

In conjunction with the first aspect or the first to second possible implementations of the first aspect, in an eighth possible implementation of the first aspect, the thickness of the fixing table is gradually reduced in the insertion direction. This allows the support plate to be easily inserted into the mounting slot.

In conjunction with the first aspect or the first to second possible implementations of the first aspect, in a ninth possible implementation of the first aspect, the fixing station is made of plastic or soft glue. Plastic and soft rubber also have good elasticity and wear resistance. They can be expanded and restored immediately after being squeezed, which can shorten the time for the support plate to be inserted into the installation groove, improve the assembly efficiency, and the soft rubber can be expanded and restored. The pressing force is guaranteed to be constant, thus ensuring the stability of the inductive side key in the mounting groove.

In a second aspect, an embodiment of the present invention provides a terminal device, including a metal frame, and a mounting slot is formed on the metal frame along a thickness direction of the terminal device, and the mounting slot is internally inserted in any one of the foregoing embodiments. The inductive side key, the fixing table of the inductive side key is closely matched with the inner wall of the mounting groove.

Since the inductive side key inserted in the mounting slot in the terminal device in the embodiment of the present invention is the same as the inductive side key sucker in any of the above embodiments, the two can solve the same technical problem and achieve the same The expected effect; when pressing is required, the finger presses the metal frame corresponding to the mounting groove, and the pressing of the finger causes slight deformation of the metal frame, and the deformation causes the side wall of the mounting groove to approach the inductor coil on the flexible circuit board, and the inductance The coil can recognize whether or not the metal object is in proximity, that is, whether the pressing is generated, and further determine whether there is a key operation.

With reference to the second aspect, in a first possible implementation manner of the second aspect, the flexible circuit board is adjacent to both sides of the inner wall of the mounting slot and the mounting slot in a thickness direction of the board body The distance between the inner walls is equal and less than the maximum sensing distance of the flexible circuit board. This can offset the effect of the metal frame when the distortion occurs, thereby solving the problem that the metal frame is prone to misjudgment when twisted.

In conjunction with the second aspect, in a second possible implementation of the second aspect, the insertion slot of the mounting slot is formed with a chamfer. This allows the inductive side key to be inserted into the mounting slot.

With reference to the second aspect, in a third possible implementation manner of the second aspect, the board body is provided with a detaching opening at at least one end of the length direction, and one end of the detaching opening is disposed with an inner wall of the mounting slot A gap is formed between the parts to allow the removal tool to extend. This facilitates the removal of the support plate from the mounting slot.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any creative work.

1 is a process diagram of a conventional inductive side key inserted into a mounting slot;

Figure 2 is a schematic diagram (model diagram and equivalent circuit diagram) of the inductive side key;

Figure 3 is a schematic diagram of an inductive side key (a schematic diagram of the coupling of a metal object and an inductive coil when a metal object approaches);

4 is a schematic structural view of an inductive side key according to an embodiment of the present invention (a flexible circuit board is disposed on a side of a board body);

5 is a schematic structural view of an inductive side key according to an embodiment of the present invention (a flexible circuit board is disposed on both sides of the board body);

6 is a schematic structural view of an inductive side key according to an embodiment of the present invention (from another perspective);

7 is a schematic structural view of a support plate according to an embodiment of the present invention;

Figure 8 is a side elevational view of the support plate in accordance with an embodiment of the present invention;

FIG. 9 is a schematic structural diagram of a terminal device (handset) according to an embodiment of the present invention;

10 is a cross-sectional view showing a mounting slot in a terminal device (handset) according to an embodiment of the present invention;

Figure 11 is an enlarged cross-sectional view showing the mounting slot in the terminal device (handset) in the embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described in the following with reference to the accompanying drawings.

Referring to FIG. 4 and FIG. 5, an embodiment of the present invention provides an inductive side key including a support board 2 and a flexible circuit board 1 provided with an inductor coil, and the support board 2 includes a board body 21 made of a hard insulating material. The flexible circuit board 1 is fixed on at least one side surface of the board body 21. The surface of the board body 21 for fixing the flexible circuit board 1 is provided with a fixing base 22 made of an elastic material, and the thickness of the fixing table 22 is larger than the flexible circuit. The thickness of the board 1. The thickness of the fixing table 22 refers to the distance from the surface of the fixed table 22 away from the plate body 21 from the surface of the plate body 21. For example, as shown in FIG. 4, the thickness of the fixing table 22 is a.

Referring to FIG. 4 and FIG. 5, the inductive side key provided by the embodiment of the present invention has a large thickness a of the fixed stage 22. At the thickness b of the flexible circuit board 1 (as shown in FIG. 4), after the inductive side key is inserted into the mounting groove 310 (as shown in FIG. 10), the surface of the fixing table 22 away from the board 21 is mounted. The inner wall of the slot 310 is in contact with each other, and the flexible circuit board 1 and the inner wall of the mounting slot 310 are separated by a distance, so that the flexible circuit board 1 can determine whether there is a change in the distance between the inner wall of the mounting slot 310 and the inner wall of the mounting slot 310. Press the action. In addition, the thickness a of the fixing table 22 is greater than the thickness b of the flexible circuit board 1, so that the flexible circuit board 1 can be prevented from being damaged by contact with the inner wall of the mounting groove 310, thereby ensuring the normal operation of the flexible circuit board 1; The table 22 is made of an elastic material, so that the elastic side contraction of the fixing table 22 enables the inductive side key to be smoothly inserted into the mounting groove 310, and the fixing table 22 can be pressed by the inner wall of the mounting groove 310. The fixing table 22 and the inner wall of the mounting groove 310 are tightly engaged to realize the fixing of the inductive side key in the mounting groove 310. Since the flexible circuit board 1 is fixed on at least one side surface of the board body 21, the fixing table 22 is fixed. On the surface of the board body 21 for fixing the flexible circuit board 1, instead of being disposed on the flexible circuit board 1, the pressing force generated by the elastic contraction of the fixing table 22 during the insertion of the inductive side key into the mounting groove 310 It acts on the surface of the board body 21 instead of the surface of the flexible circuit board 1, so that the flexible circuit board 1 is not deformed by the compression caused by the elastic contraction of the fixing table 22, and the flexible circuit board 1 is inserted into the mounting groove 3. After 10, the distance from the side of the flexible circuit board 1 to the side wall of the mounting groove 310 can be kept uniform and stable, thereby preventing the inductive performance of the flexible circuit board 1 from being affected. Therefore, compared with the prior art, in the process of inserting the inductive side key provided by the embodiment of the present invention into the mounting slot 310, the flexible circuit board 1 is not deformed by the compression caused by the elastic contraction of the fixing base 22, thereby ensuring The distance between the flexible circuit board 1 and the side walls of the mounting groove 310 is uniform and stable, thereby preventing the inductive performance of the flexible circuit board 1 from being affected.

It should be noted that, as shown in FIG. 5, the inductor coil in the flexible circuit board 1 is electrically connected to the motherboard of the terminal device (such as a mobile phone) through the connector 3, and the connector 3 can transmit the induction coil sensing signal to the motherboard, and the motherboard can It is judged based on the signal whether there is a pressing action.

The manner in which the flexible circuit board 1 is fixed to the board body 21 is not unique. For example, the flexible circuit board 1 can be fixed to the board body 21 by screws. In addition, the flexible circuit board 1 can also be attached to the board body 21 by adhesive. on the surface. Compared with the manner in which the flexible circuit board 1 is attached to the surface of the board body 21 by means of screws, the flexible circuit board 1 can not only reduce the number of parts, but also facilitate the flexible circuit board 1 from the board body 21. Disassembly.

When the flexible circuit board 1 and the board body 21 are pasted, since the widths of the flexible circuit board 1 and the board body 21 are relatively small, the flexible circuit board 1 is easily misaligned when pasted together with the board body 21, in order to solve this problem, As shown in FIG. 5, the surface of the board 21 for fixing the flexible circuit board 1 is provided with a positioning post 23, and the flexible circuit board 1 is provided with a positioning hole 11 which is disposed in the positioning hole 11. Thus, when the flexible circuit board 1 and the board body 21 are pasted, the positioning of the flexible circuit board 1 can be conveniently achieved by the cooperation of the positioning post 23 and the positioning hole 11, so that the flexible circuit board 1 and the board body 21 can be pasted together. It is prone to misplacement.

Further, in order to improve the positioning effect of the flexible circuit board 1 and the board body 21, the flexible circuit board 1 and the board body 21 are less likely to be misaligned. As shown in FIG. 5, the number of the positioning holes 11 is two, and two positioning positions are made. The holes 11 are spaced apart along the length of the plate body 21, and the number of the positioning posts 23 is two. The two positioning posts 23 are matched with the two positioning holes 11 in one-to-one correspondence. Since the number of the positioning holes 11 and the positioning posts 23 is two, the two positioning holes 11 are matched with the two positioning posts 23 one by one, and the relative rotation between the flexible circuit board 1 and the board body 21 can be prevented. The flexible circuit board 1 and the board body 21 can be made less likely to be misaligned, thereby improving both of them. Positioning effect between.

Referring to FIG. 5, FIG. 9, and FIG. 10, the inductive side key provided in the embodiment of the present invention is inserted into the mounting slot 310 of the metal frame 300 of the terminal device (such as a mobile phone). When the button needs to be pressed, the finger presses and the mounting slot 310. The corresponding metal frame 300 causes the metal frame 300 to be slightly deformed, and the deformation can be generated to make the side wall of the mounting groove 310 approach the inductance coil on the flexible circuit board 1 (the deformation amount can be induced in the 1 micrometer inductor coil, the shape variable and the force The size is related to the material strength. For example, setting 200 gram force can be deformed by 1 micrometer. When the pressing force is less than this value, the inductor coil will not be sensed, which can prevent misoperation. The inductor coil on the flexible circuit board 1 can be recognized. Whether or not there is a metal object approaching, that is, whether the pressing is generated, and then determining whether there is a button action. In practical applications, the metal frame 300 of the terminal device (illustrated by the mobile phone as an example) will inevitably undergo torsion deformation. For example, the mobile phone is installed in the tight pocket of the clothes, and the mobile phone case may have some twist when the person is pulling out or walking. The deformation makes it easy for the metal frame 300 to reach the amount of deformation that the inductor can sense, thereby causing the inductance coil to be misjudged as having a pressing action, which is very disadvantageous for the normal use of the mobile phone. In order to solve this problem, by appropriately setting the width of the mounting groove 310, the distance between the two sides of the flexible circuit board 1 to the inner walls of both sides of the mounting groove 310 (the inner walls on both sides in the thickness direction of the flexible circuit board 1) is equal. When the outer casing is twisted, the deformation of the metal bezel 300 increases the distance between the inner wall of the flexible circuit board 1 to the mounting groove 310, the distance from the inner wall of the other side of the mounting groove 310, and the amount of distance reduction and the amount of distance increase. Equally, the offset effect of the metal frame 300 can be offset. When the inductance coil senses a distance from the inner wall of the mounting groove 310, the non-pressing action can be judged, thereby solving the problem of misjudgment. problem.

Referring to Fig. 10, the inductance of the inductance coil in the flexible circuit board 1 is usually 0.2 to 0.8 mm, and if it exceeds this distance, the sensitivity of the induction coil is lowered. Since the flexible circuit board 1 is very thin, it is necessary to ensure that the distance between the two sides of the flexible circuit board 1 to the inner walls of the mounting slots 310 is equal and within the maximum sensing distance of the inductor coil, the distance between the inner walls of the mounting slots 310 is required. It is very small, but this will increase the processing difficulty of the mounting groove 310, which is not conducive to reducing the processing cost. In order to make the distance between the two sides of the flexible circuit board 1 from the inner wall of the mounting slot 310 equal, and without affecting the inductance sensitivity of the inductor, the distance between the inner walls of the mounting slots 310 is not too small, as shown in FIG. The flexible circuit board 1 is folded and fixed to the opposite surfaces of the board body 21. Thus, by adjusting the thickness of the plate body 21, the inner wall distances of the two sides of the mounting groove 310 fall within the range that is easy to be processed by the current mounting groove 310, so that the flexible circuit board 1 can be fitted to the inner walls of both sides of the current mounting groove 310. The distance does not affect the sensitivity of the induction.

Referring to FIGS. 5 and 6, the flexible circuit board 1 includes a first folded portion 12 fixed to the first surface of the board body 21 and a second folded portion 13 fixed to the second surface of the board body 21, first The folding portion 12 and the second folding portion 13 are connected by a connecting portion 14, and the connecting portion 14 covers the first side edge 211 of the plate body 21. The length of the connecting portion 14 is smaller than the first folding portion 12 and the second folding portion The length of the portion 13. Since the length of the connecting portion 14 is smaller than the lengths of the first folding portion 12 and the second folding portion 13, when the flexible circuit board 1 is folded, the resistance of the folding can be reduced, thereby making the flexible circuit board 1 Folding is easier, which helps to shorten the folding time and improve the installation efficiency of the inductive side keys.

Since the thickness of the support plate 2 is relatively small, the support plate 2 is easily deformed during the insertion of the inductive side key into the mounting groove 310. To reduce the deformation of the support plate 2, as shown in FIGS. 6 and 7, the plate The portion of the first side edge 211 of the body 21 that does not cover the connecting portion 14 is provided with a reinforcing rib 212, and the thickness of the reinforcing rib 212 is larger than the plate The thickness of the body 21. By providing the reinforcing ribs 212 on the portion of the first side edge 211 of the plate body 21 that does not cover the connecting portion 14, the strength and rigidity of the supporting plate 2 can be improved, and the insertion of the inductive side key into the mounting groove 310 can be greatly reduced. The deformation of the support plate 2 during the process prevents the flexible circuit board 1 from being largely deformed.

In the inductive side key provided by the embodiment of the present invention, the structure of the support plate 2 is not unique. For example, the support plate 2 may have the following structure: the first surface 213 of the plate body 21 is provided with a first fixing base 221, and the flexible circuit The first folded portion 12 of the board 1 is disposed on a side of the first fixing base 221 along the longitudinal direction of the board body 21, and the second surface 214 of the board body 21 is provided with a second fixing base 222, the first of the flexible circuit board 1. The two folded portions 13 are disposed on one side of the second fixing table 222 along the longitudinal direction of the plate body 21.

In addition, the support plate 2 may also be the structure shown in FIG. 6 and FIG. 7. The first surface 213 of the plate body 21 is provided with two first fixing stages 221, and the first folded portion 12 of the flexible circuit board 1 is disposed. Between the two first fixing stages 221, two second fixing stages 222 are disposed on the second surface 214 of the board body 21, and the second folding part 13 of the flexible circuit board 1 is disposed on the two second fixing stages. Between 222. The first surface 213 and the second surface 214 of the plate body 21 are provided with a fixing base 22, and in the solution shown in FIGS. 6 and 7, the first surface 213 and the second surface 214 of the plate body 21 are formed. Two fixing stages 22 are provided on the upper side, and the first folded portion 12 and the second folded portion 13 of the flexible circuit board 1 are respectively located between the two fixing stages 22, so that the supporting plate 2 is inserted into the mounting groove 310. During the process, the support plate 2 is not easily tilted, so that the flexible circuit board 1 is not easily tilted, and the uniformity of the distance between the flexible circuit board 1 and the side wall of the mounting groove 310 is ensured.

In order to facilitate the removal of the support plate 2 from the mounting groove 310, as shown in FIG. 5, at least one end of the plate body 21 along the longitudinal direction is provided with a detaching opening 24, so that the tool such as the scorpion can clamp the detaching port 24 and the supporting plate 2 It is picked up from the mounting groove 310, thereby facilitating the removal and replacement of the support plate 2 and the flexible circuit board 1.

In order to facilitate the insertion of the support plate 2 into the mounting groove 310, as shown in Fig. 10, the thickness of the fixing table 22 is gradually reduced in the insertion direction (i.e., the thickness of the upper end of the fixing table 22 in Fig. 10 is larger than the thickness of the lower end). The support plate 2 is inserted into the mounting groove 310, and the fixing table 22 is in contact with the inner wall of the mounting groove 310. If the lower end of the fixing base 22 has a large thickness, the lower end of the fixing table 22 does not easily protrude into the mounting groove 310, thereby The support plate 2 is not easily inserted into the mounting groove 310, and therefore, the thickness of the fixing table 22 is gradually reduced in the insertion direction, so that the thickness of the lower end of the fixing table 22 is relatively small, and during the insertion of the support plate 2 into the mounting groove 310, The lower end of the fixing table 22 easily protrudes into the mounting groove 310, so that the process of inserting the support plate 2 into the mounting groove 310 is more convenient. The draft angle of the fixing table 21 is 1.5 to 2°.

In the inductive side key provided by the embodiment of the invention, the material of the fixing table 22 is not unique. For example, the fixing table 22 can be made of memory foam, and the fixing table 22 can also be made of plastic. Compared with the memory foam, the plastic has better elasticity during the insertion of the support plate 2 into the mounting groove 310, and can be immediately expanded and restored after being squeezed (the memory foam can be expanded and recovered 10 seconds after being squeezed). Therefore, the time for the support plate 2 to be inserted into the mounting groove 310 can be shortened, and the assembly efficiency can be improved; the plastic can ensure a constant pressing force after expansion and recovery, thereby ensuring the stability of the inductive side key in the mounting groove 310 (memory) The pressing force of the foam on the inner wall of the mounting groove 310 is easily affected by the difference of the air pressure inside and outside the memory foam. When the air pressure difference between the inside and the outside changes, the change of the pressing force of the memory foam on the inner wall of the mounting groove 310 easily affects the inductance. The stability of the side key in the mounting groove 310); in addition, the plastic also has better wear resistance, so that the fixing table 22 is not easily damaged when the inductive side key is assembled (the memory foam is easily damaged by the crucible).

In addition to memory foam and plastic, the fixing table 22 can also be made of soft rubber (such as rubber, silicone, etc.). Compared with the memory foam, the soft rubber also has better elasticity and wear resistance, and can be immediately expanded and restored after being squeezed, which can shorten the time for the support plate 2 to be inserted into the mounting groove 310, improve assembly efficiency, and is soft. The glue can ensure a constant pressing force after the expansion and recovery, thereby ensuring the stability of the inductive side key in the mounting groove 310.

When the fixing table 22 is a soft rubber, the fixing table 22 can be fixed on the supporting plate 2 by a two-color injection molding process, so that the soft fixing table 22 and the hard supporting plate 2 can form a different mechanical property, different tactile sensations and visions. Overall. Among them, the two-color injection molding process, also called sequential stack injection molding, is a process of superimposing a more elastic material on a rigid substrate, which finally forms a polymer composition with different mechanical properties, different touch and vision and is permanently connected. The product.

On the other hand, as shown in FIG. 9 , the embodiment of the present invention further provides a terminal device, including a metal frame 300. The metal frame 300 is provided with a mounting slot 310 along the thickness direction of the terminal device. In the inductive side key 100 of any embodiment, the fixing table 22 of the inductive side key 100 is closely fitted to the inner wall of the mounting groove 310.

Since the inductive side key 100 inserted in the mounting slot 310 in the terminal device in the embodiment of the present invention is the same as the inductive side key 100 in any of the above embodiments, the two can solve the same technical problem, and The same expected effect is achieved; when the pressing is required, the finger presses the metal frame 300 corresponding to the mounting groove 310, and the pressing of the finger causes the metal frame 300 to be slightly deformed, and the deformation causes the side wall of the mounting groove 310 to approach the flexible circuit board 1 The upper inductor coil and the inductor coil can recognize whether or not the metal object is close, that is, whether the press is generated or not, and thereby determine whether there is a button action. The fixing table 22 of the inductive side key 100 is closely matched with the inner wall of the mounting groove 310, and the tight fit may be an interference fit or a zero clearance fit.

Referring to FIG. 10, the metal frame 300 is easily twisted during use of the terminal device such as a mobile phone. For example, the mobile phone is installed in a tight pocket, and the person is prone to twist when walking, and the torsional deformation of the metal frame 300 is easy to make the flexible circuit. The inductance coil in the board 1 is erroneously judged as a pressing operation. To solve this problem, the distance between the side surfaces of the flexible circuit board 1 near the inner wall of the mounting groove 310 and the inner wall of the mounting groove 310 in the thickness direction of the board body 21 is along the thickness direction of the board body 21. Equal and smaller than the maximum sensing distance of the flexible circuit board 1. When the metal frame 300 of the mobile phone is twisted, the deformation of the metal frame 300 increases the distance between the two sides of the flexible circuit board 1 to the inner wall of the mounting slot 310, and the distance from the inner wall of the other side of the mounting slot 310 decreases, and the distance is reduced. The small amount and the distance increase are equal, so that the effect of the metal frame 300 being twisted can be offset. When the inductance coil senses a distance from the inner wall of the mounting groove 310, the non-pressing action can be judged. Therefore, the problem that the metal frame 300 is easily distorted when twisted is solved.

In order to facilitate the insertion of the inductive side key 100 into the mounting groove 310, as shown in FIGS. 10 and 11, a chamfer 311 is formed at the insertion opening of the mounting groove 310. By providing the chamfer 311 at the insertion opening of the mounting groove 310, the area of the notch of the mounting groove 310 can be increased, so that the notch area of the mounting groove 310 is larger than the area of the end of the inductive side key 100 near the notch. The inductive side key 100 is easily opposed to the slot and inserted into the mounting slot 310, thereby facilitating shortening of the alignment time of the inductive side key 100 and the mounting slot 310.

In order to facilitate the removal of the support plate 2 from the mounting groove 310, as shown in FIGS. 5 and 10, at least one end of the plate body 21 in the longitudinal direction is provided with a detaching opening 24, and one end of the detaching opening 24 and the inner wall of the mounting groove 310 are provided. A gap is formed between the parts to allow the removal tool to extend. In this way, the tool such as the tweezers can clamp the support plate 2 from the mounting groove 310 by clamping the detaching port 24 on the plate body 21, thereby facilitating the removal and replacement of the support plate 2 and the flexible circuit board 1.

The above is only the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It is within the scope of the invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims (14)

An inductive side key, comprising: a support plate and a flexible circuit board provided with an inductor coil, the support plate comprising a plate body made of a hard insulating material, the flexible circuit board being fixed to the board On at least one side surface of the body, the surface of the plate for fixing the flexible circuit board is provided with a fixing platform, the fixing table is made of an elastic material, and the thickness of the fixing table is larger than the flexible circuit board thickness of. The inductive side key according to claim 1, wherein the flexible circuit board is adhered to a surface of the board by a backing. The inductive side key according to claim 2, wherein the plate body is provided with a positioning post on the surface of the flexible circuit board, and the positioning circuit is provided on the flexible circuit board, the positioning The column fits through the positioning hole. The inductive side key according to any one of claims 1 to 3, wherein the flexible circuit board is folded and fixed to opposite surfaces of the board body. The inductive side key according to claim 4, wherein the flexible circuit board comprises a first folded portion fixed to the first surface of the board body and a second surface fixed to the board body a second folded portion, the first folded portion and the second folded portion are connected by a connecting portion, the connecting portion covers a first side edge of the plate body, and the connecting portion has a length smaller than The length of the first folded portion and the second folded portion. The inductive side key according to claim 5, wherein a portion of the first side edge of the plate that does not cover the connecting portion is provided with a reinforcing rib, and the reinforcing rib has a thickness larger than the plate body. thickness of. The inductive side key according to claim 5, wherein the first surface of the plate body is provided with two first fixing stations, and the first folding portion of the flexible circuit board is disposed on two Between the first fixing stages, two second fixing stages are disposed on the second surface of the board body, and the second folding part of the flexible circuit board is disposed on the two second fixing stages between. The inductive side key according to any one of claims 1 to 3, characterized in that the plate body is provided with a detaching opening at at least one end in the longitudinal direction. The inductive side key according to any one of claims 1 to 3, characterized in that the thickness of the fixing table is gradually reduced in the insertion direction. The inductive side key according to any one of claims 1 to 3, wherein the fixing table is made of plastic or soft rubber. A terminal device, comprising: a metal frame, wherein the metal frame is provided with a mounting slot along a thickness direction of the terminal device, and the mounting slot is provided with the inductor according to any one of claims 1 to 10. The side key of the inductive side key is closely matched with the inner wall of the mounting groove. The terminal device according to claim 11, wherein a distance between the side faces of the flexible circuit board adjacent to the inner wall of the mounting groove and the inner wall of the mounting groove in the thickness direction of the board body Equal and smaller than the maximum sensing distance of the flexible circuit board. The terminal device according to claim 11, wherein a chamfer is formed at an insertion opening of the mounting groove. The terminal device according to claim 11, wherein at least one end of the plate body along the longitudinal direction is provided with a detaching opening, and one end of the detaching opening is formed with the inner wall of the mounting groove to allow disassembly The gap into which the tool extends.

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