A mirror cabinet capable of preventing mirror capacitive touch buttons from malfunctioning when touched

Abstract

The present invention relates to a mirror cabinet capable of preventing a capacitive touch button on a mirror from malfunctioning. The mirror cabinet comprises a mirror surface, the mirror surface comprises a glass layer, a metal coating arranged on the back of the glass layer, an uncoated metal layer area is arranged on the back of the glass layer, a capacitive touch plate comprising a plurality of touch buttons is arranged in the uncoated metal layer area; a controller electrically connected to the capacitive touch plate and a high-frequency switching power supply electrically connected to the controller are also arranged on the back of the mirror surface; the mirror cabinet also comprises a metal component arranged on the mirror surface and insulated from the metal coating, the metal component is electrically connected to the ground terminal of the controller; the capacitance of a second capacitor C5 formed between the metal component and the metal coating is at least 10 times the capacitance of a first capacitor C4 formed between the metal coating and the capacitive touch plate. The mirror cabinet can prevent the capacitive touch button on the mirror from malfunctioning so that the touch system has good stability.

Description

Technical Field

[0001] The invention relates to the technical field of household articles, and in particular to a mirror cabinet capable of preventing erroneous touch operations of a capacitive touch button on a mirror surface. Background Art

[0002] As people's living standards continue to improve, people's requirements for home products are getting higher and higher. In order to meet the needs of consumers, mirror cabinets on the market are now usually equipped with LED lights. In order to make the mirror cabinet more beautiful, some products will be used to control the switch, brightness, color tone and other control buttons of the LED lights are set on the mirror surface of the mirror cabinet. These control buttons generally use capacitive touch buttons.

[0003] However, there are some problems with this capacitive touch button during use. The mirror surface of the existing mirror cabinet includes a glass layer, a metal coating, etc. from the front to the back. A non-metal coating area is left on the back of the glass layer to install a touch panel including multiple touch buttons. A high-frequency switching power supply and a controller for controlling LED lights are also provided on the back of the mirror surface. The high-frequency transformer in the high-frequency switching power supply generates a high-frequency radiation signal during operation. The signal will form a coupling capacitor C4 between the metal coating and the touch panel. Figure 4 As shown, this will cause a change in charge at the touch point of the touch pad, resulting in malfunctions during touch operations. For example, when you originally wanted to adjust the brightness of the LED light by touching the brightness button, the color tone of the LED light changed, affecting the stability of the entire touch system. Summary of the invention

[0004] In view of the above problems, an object of the present invention is to provide a mirror cabinet which can prevent the misoperation of the capacitive touch buttons on the mirror surface so as to improve the stability of the touch system.

[0005] In order to achieve the above-mentioned object, the technical solution of the present invention is: a mirror cabinet capable of preventing the misoperation of the capacitive touch buttons on the mirror surface, the mirror cabinet comprising a mirror surface, the mirror surface comprising a glass layer, a metal plating layer arranged on the back of the glass layer, an uncoated metal layer area being arranged on the back of the glass layer, and a capacitive touch plate comprising a plurality of touch buttons being arranged in the uncoated metal layer area;

[0006] The back of the mirror is also provided with a controller electrically connected to the capacitive touch panel and a high-frequency switching power supply electrically connected to the controller;

[0007] Features:

[0008] It also includes a metal component disposed on the mirror surface and insulated from the metal coating, wherein the metal component is electrically connected to a ground terminal of the controller;

[0009] The capacitance of the second capacitor C5 formed between the metal component and the metal plating layer is at least 10 times the capacitance of the first capacitor C4 formed between the metal plating layer and the capacitive touch pad.

[0010] Furthermore, the ground terminal of the controller is connected to a safety capacitor Y1, and the metal component is connected to the ground terminal through the safety capacitor Y1;

[0011] The capacitance of the safety capacitor Y1 is at least 10 times the capacitance of the second capacitor C5.

[0012] Furthermore, the mirror surface also includes an insulating coating disposed on the back of the metal coating, and the back of the glass layer is also provided with an uncoated insulating coating area, and the uncoated insulating coating area corresponds to the position of the uncoated metal layer area.

[0013] Furthermore, the metal component is a metal tape disposed on the back of the insulating coating, and the metal tape is connected to the safety capacitor Y1 through a wire.

[0014] Furthermore, the metal component is a metal frame arranged around the mirror surface.

[0015] Furthermore, the material of the metal plating layer is mercury.

[0016] Compared with the prior art, the advantages of the present invention are:

[0017] By arranging a metal component to connect it to the ground terminal of the controller, and utilizing the characteristic that the capacitance of the second capacitor C5 formed between the metal component and the metal coating of the mirror is much greater than the capacitance of the first capacitor C4 formed between the metal coating and the touch pad, the charge of the capacitor C4 formed by the coupling between the capacitive touch pad and the metal coating when the high-frequency interference signal of the power supply flows through is very small, thereby greatly reducing the influence of the high-frequency radiation interference signal on the capacitive touch pad, thereby converting the potential moving point generated by the interference signal on the capacitive touch pad into the potential static point, preventing the capacitive touch pad from touching incorrectly, and improving the stability of the mirror touch system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the mirror layered structure of this application.

[0019] Figure 2 This is a schematic diagram of the structure of the components on the back of the mirror of this application.

[0020] Figure 3 This is a structural block diagram of the mirror touch button of this application under ideal working conditions.

[0021] Figure 4 This is a structural block diagram of the mirror touch button of this application under actual working conditions.

[0022] Figure 5 This is a structural block diagram of the actual working conditions after the safety capacitors and metal parts are installed in the mirror cabinet of this application.

[0023] Figure 6 for Figure 5 The corresponding equivalent circuit diagram. DETAILED DESCRIPTION

[0024] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0025] like Figure 1 The figure shows a schematic diagram of the mirror layered structure of the mirror cabinet. Figure 2 The figure shows a schematic diagram of the structure of the components on the back of the mirror. The mirror includes a transparent glass layer 1, a metal coating 2 disposed on the back of the glass layer 1 for reflecting light, and the metal coating 2 is usually made of mercury. Of course, in order to insulate the metal coating 2, an insulating coating 3 is also disposed on the metal coating 2, and the insulating coating 3 can be formed by coating with insulating paint. The back of the mirror is also provided with a high-frequency switching power supply 4, a controller 5 electrically connected to the high-frequency switching power supply 4, and a capacitive touch panel 6 electrically connected to the controller 5. The capacitive touch panel 6 is provided with touch buttons such as switch, brightness adjustment, and color tone adjustment. The mirror cabinet is also provided with an LED lamp 7, and the LED lamp 7 is connected to the controller 5.

[0026] In the present application, the LED lamp 7 is arranged around the mirror surface. Obviously, the LED lamp 7 can also be arranged at other positions as long as the lighting needs of the user are met. In order to facilitate the installation of the capacitive touch panel 6, the back of the glass layer 1 has an uncoated metal layer area. At the same time, the back of the glass layer 1 also has an uncoated insulating coating area. The uncoated metal layer area corresponds to the uncoated insulating coating area. Corresponding to the layered structure design, it can be seen that Figure 1 In fact, it is equivalent to that the metal plating layer 2 is provided with a mounting port 21 for mounting the capacitive touch pad 6 , and the insulating coating layer 3 is provided with an opening 31 for mounting the capacitive touch pad 6 .

[0027] like Figure 3The figure shows an ideal working state diagram of the touch button of the mirror cabinet. As shown in the figure, when the user operates, a coupling capacitor C1 is formed between the touching finger and the capacitive touch plate 6, and its capacitance is about 1pF. A coupling capacitor C2 is formed between the user and the ground, and its capacitance is about 100pF. Through the cooperation of capacitors C1 and C2, the corresponding touch button on the capacitive touch plate 6 generates a charge change, thereby realizing corresponding operation feedback, such as turning the LED light 7 on and off or adjusting the color or brightness.

[0028] However, the actual situation is that in addition to the capacitors C1 and C2, the high-frequency transformer in the high-frequency switching power supply 4 will generate a high-frequency radiation signal, which will cause the high-frequency switching power supply 4 to couple with the metal coating 2 to generate a third capacitor C3 (the value of C3 is usually at the PF level), and the metal coating 2 and the capacitive touch pad 6 to couple to generate a first capacitor C4 (the value of C4 is usually at the PF level). Figure 4 As shown, due to the existence of capacitors C3, C4 and the high-frequency radiation signal of the power supply, the mirror metal coating 2 is a potential moving point in the entire mirror cabinet system, and a large part of the high-frequency radiation signal is transmitted to the touch point of the capacitive touch panel 6 through the large-area metal coating 2 of the mirror, causing interference to the touch point and causing malfunction.

[0029] In order to eliminate the potential moving point, the solution adopted by the present application is to set a metal component 8 insulated from the metal coating 2 on the mirror surface, the metal component 8 is electrically connected to the ground terminal of the controller 5, and the capacitance of the second capacitor C5 formed by the coupling between the metal component 8 and the metal coating 2 is much greater than the capacitance of the first capacitor C4 formed between the metal coating 2 and the capacitive touch pad 6. Specifically, the capacitance of the second capacitor C5 is at least 10 times the capacitance of the first capacitor C4. Connecting the metal component 8 to the ground terminal of the controller 5 can make the charge formed by the interference signal flow to the ground terminal, thereby reducing the charge flowing to the capacitive touch pad, so as to reduce the influence of the interference signal on the touch pad.

[0030] In order to ensure the operational safety of the touch button, a safety capacitor Y1 is also provided in the controller in this embodiment. The metal component 8 is connected to the ground terminal of the controller 5 through the safety capacitor Y1, and the capacitance of the safety capacitor Y1 is at least 10 times that of C5, so that the capacitance of the safety capacitor Y1 is much larger than the capacitance of C5.

[0031] As a preferred embodiment, the metal component can be a metal tape 8, which is tightly covered on the back of the insulating coating 3 of the mirror and connected to the safety capacitor Y1 through a wire, such as Figure 5Of course, for some mirrors with metal frames, the metal component can be the metal frame, that is, the safety capacitor Y1 is connected to the metal frame through a wire. As a person skilled in the art, this solution does not make any improvements to the metal frame structure of the mirror, so it is not shown in the figure.

[0032] Through the above structural improvements, we can get the following Figure 6 The equivalent circuit diagram shown is as follows: Figure 6 As shown, the second capacitor C5 and the safety capacitor Y1 are equivalent to being connected in series. C5 and Y1 are connected in series and then connected in parallel with C4. The high-frequency interference signal of the power supply is divided into two paths after passing through the third capacitor C3. One path passes through the first capacitor C4 and is then grounded, and the other path passes through the second capacitor C5 and the safety capacitor Y1 and is then grounded.

[0033] Assume that the high-frequency interference signal voltage of the power supply is V0, and the interference signal voltage divided by the first capacitor C4 is V1, that is, the interference signal voltage divided by the capacitive touch panel is V1. Combined with the capacitive reactance formula Xc=1 / ωc, where Xc is the capacitive reactance, ω is the angular frequency, and c is the capacitance value, since the capacitance value of the safety capacitor Y1 is much larger than the capacitance value of the second capacitor C5, in this case, the capacitive reactance formed by the safety capacitor Y1 can be ignored, so the relationship between V1 and V0 is as follows:

[0034] V1=(1 / (ωc4+ωc5)) / ((1 / (ωc4+ωc5))+(1 / ωc3)), where c3, c4, c5 are the capacitance values ​​of capacitors C3, C4, C5 respectively;

[0035] After conversion:

[0036] V1=(c3 / (c3+c4+c5))V0

[0037] Since the capacitance of the second capacitor C5 is much larger than that of the first capacitor C4, V1 can be approximately calculated as:

[0038] V1=(c3 / (c3+c5))V0

[0039] It can be seen from the formula that when the capacitance of the safety capacitor Y1 is much larger than the capacitance of the second capacitor C5 and the capacitance of the second capacitor C5 is much larger than the capacitance of the first capacitor C4, the voltage divided by the first capacitor C4 is determined by the capacitance ratio of the second capacitor C5 to the third capacitor C3. It can be seen that through this design, the voltage of the high-frequency interference signal of the power supply divided by the touch point on the capacitive touch pad 6 can be borne by C3 and C5, while the parasitic capacitance C4 formed by the coupling of the touch pad itself can be ignored. When the capacitance of C5 is much larger than the capacitance of C3, the value of V1 can be very small, that is, the interference signal voltage divided by the capacitive touch pad 6 is very small. In this way, the capacitance of C3 and C5 can be controlled to reduce the influence of the interference signal on the touch point of the capacitive touch pad, thereby improving the stability of the touch system.

[0040] According to the above and combined with the capacitance calculation formula of the flat plate capacitor: c=εS / 4πkd, where ε is the dielectric constant, S is the area facing the two plates, k is the electrostatic constant, and d is the vertical distance between the two plates, it can be concluded that during production and assembly, the larger the area of ​​the metal tape, the better, because this can make the capacitance of the second capacitor C5 larger. Similarly, when the high-frequency switching power supply is assembled, the farther away from the mirror surface of the mirror cabinet, the better, so that the capacitance of the third capacitor C3 can be smaller. In other words, the above parameters can be adjusted during production and assembly to control the capacitance of C3 and C5, and then achieve the desired effect.

[0041] Of course, the same conclusion can be drawn through current loop analysis, as follows:

[0042] Since the capacitance of Y1 is much larger than that of C5, according to the capacitive reactance formula Xc=1 / ωc, the capacitive reactance of Y1 is very small relative to that of C5 and is therefore ignored during analysis. Also, since the capacitance of C5 is much larger than that of C4, the capacitive reactance of the branch where C5 is located is much smaller than the capacitive reactance of the branch where C4 is located. Most of the charge of the high-frequency interference signal of the power supply flows through C3 to form a loop through C5, and very little charge flows through C4, which makes the influence of the high-frequency interference signal of the power supply on the touch point very small, thereby improving the stability of the touch system.

[0043] Although embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A mirror cabinet capable of preventing a capacitive touch button on a mirror from malfunctioning due to touch, the mirror cabinet comprising a mirror surface, the mirror surface comprising a glass layer (1), a metal coating layer (2) arranged on the back of the glass layer (1), an uncoated metal layer area being arranged on the back of the glass layer (1), and a capacitive touch plate (6) comprising a plurality of touch buttons being arranged in the uncoated metal layer area; The back of the mirror surface is also provided with a controller (5) electrically connected to the capacitive touch panel (6) and a high-frequency switching power supply (4) electrically connected to the controller (5); Features: It also includes a metal component that is disposed on the mirror surface and is insulated from the metal coating (2), and the metal component is electrically connected to the ground terminal of the controller (5); The capacitance of the second capacitor C5 formed between the metal component and the metal coating (2) is at least 10 times the capacitance of the first capacitor C4 formed between the metal coating (2) and the capacitive touch pad (6).

2. The mirror cabinet according to claim 1, characterized in that: The ground terminal of the controller (5) is connected to a safety capacitor Y1, and the metal component is connected to the ground terminal via the safety capacitor Y1; The capacitance of the safety capacitor Y1 is at least 10 times the capacitance of the second capacitor C5.

3. The mirror cabinet according to claim 1, characterized in that: The mirror surface also includes an insulating coating (3) arranged on the back of the metal coating (2), and the back of the glass layer (1) is also provided with an uncoated insulating coating area, and the uncoated insulating coating area corresponds to the position of the uncoated metal layer area.

4. The mirror cabinet according to claim 3, characterized in that: The metal component is a metal tape (8) arranged on the back of the insulating coating (3), and the metal tape (8) is connected to the safety capacitor Y1 through a wire.

5. The mirror cabinet according to claim 3, characterized in that: The metal component is a metal frame arranged around the mirror surface.

6. The mirror cabinet according to claim 1, characterized in that: The material of the metal plating layer (2) is mercury.

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