Graphic structure of touch key
By designing a novel graphical structure consisting of a reference signal layer, a sensing channel layer, and an excitation signal layer, the circuitry of the touch button is simplified, the short circuit and leakage problems caused by circuit aging are solved, and higher anti-aging performance is achieved.
Patent Information
- Application Number
- CN202422665522.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-01
- Publication Date
- 2025-10-21
- Estimated Expiration
- 2034-11-01
AI Technical Summary
Existing touch buttons have complex circuit designs that are prone to aging and short circuits and leakage.
A novel pattern structure is adopted, consisting of a reference signal layer, a sensing channel layer, and an excitation signal layer. The reference signal layer surrounds the sensing channel layer, and the three are separated by a dielectric layer and connected to the scanning channel of the capacitive scanning chip.
It simplifies circuit design, improves anti-aging capabilities, and prevents short circuits and leakage.
Smart Images
Figure CN223463005U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the key design field, concretely relates to a pattern structure of touch key. BACKGROUND
[0002] The existing touch key, circuit design is more complex, and the circuit aging is more prone to short circuit, electric leakage phenomenon. INVENTION CONTENTS
[0003] The utility model discloses a purpose is realized through the following technical schemes.
[0004] Specifically, the utility model provides a pattern structure of touch key, include:
[0005] Reference signal layer, inductive channel layer, excitation signal layer;
[0006] Reference signal layer, inductive channel layer set up on the same side of excitation signal layer.
[0007] Further, the inductive channel layer is square, the reference signal layer surrounds and is set up at the periphery of the inductive channel layer, and the reference signal layer is close to the inductive channel layer but does not contact.
[0008] Further, the outside of the reference signal layer is located in the outermost side of the excitation signal layer.
[0009] Further, the reference signal layer, inductive channel layer and the excitation signal layer have dielectric layer between.
[0010] Further, the reference signal layer, inductive channel layer are attached to one side of film material, and the excitation signal layer is attached to the other side of film material.
[0011] Further, the reference signal layer, inductive channel layer, excitation signal layer are connected the scanning channel of external capacitive scanning chip respectively.
[0012] The utility model discloses a pattern structure of touch key, circuit design is simple, and anti-aging, anti-short circuit, anti-electricity. BRIEF DESCRIPTION OF DRAWINGS
[0013] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments with reference made to the accompanying drawings. The drawings are for purposes of illustration only and are not intended to limit the present utility model. The same reference numerals in the drawings denote the same components throughout the several drawings. In the drawings:
[0014] ATTACHMENT Figure 1 The pattern structure of touch key according to the utility model embodiment is shown.
[0015] Fig. 1 is a schematic diagram of a touch key according to an embodiment of the present application. Figure 2 Fig. 2 is a schematic diagram of a touch key according to an embodiment of the present application.
[0016] Fig. 3 is a schematic diagram of a touch key according to an embodiment of the present application. Figure 3 Fig. 4 is a schematic diagram of a touch key according to an embodiment of the present application.
[0017] Fig. 5 is a schematic diagram of a touch key according to an embodiment of the present application. Figure 4 Fig. 6 is a schematic diagram of a touch key according to an embodiment of the present application.
[0018] Fig. 7 is a schematic diagram of a touch key according to an embodiment of the present application. Figure 5 Fig. 8 is a schematic diagram of a touch key according to an embodiment of the present application.
[0019] Figure 6 Fig. 9 is a schematic diagram of a touch key according to an embodiment of the present application. DETAILED DESCRIPTION
[0020] Exemplary embodiments of the present disclosure will be described more fully hereinafter with reference to the accompanying drawings; however, they are not intended to limit the present disclosure to particular embodiments. Rather, the intention is to convey the concept of the present disclosure to a technical person skilled in the art with the best mode for carrying out the present disclosure.
[0021] As shown in the drawings, according to an embodiment of the present application, a touch key is provided, which includes a reference signal layer (reference), a sensing channel layer (sense), and a dummy signal layer (dummy). The reference signal layer (reference), the sensing channel layer (sense), and the dummy signal layer are respectively connected to a scanning channel of a capacitive scanning chip. Figure 1 The touch key has two layers, the reference and the sense are in the upper layer, and the dummy is in the lower layer. The sense is a square or a similar square-shaped pattern with an area of more than 5mm*5mm, the reference surrounds the periphery, and the reference ring is close to the sense but not in contact with the sense. The outermost side of the dummy in the lower layer should not be smaller than the outer side of the reference.
[0022] A uniform medium can be added between the two layers, or attached to both sides of the film material.
[0023] As shown in the drawings, according to an embodiment of the present application, a touch key is provided, which includes a reference signal layer (reference), a sensing channel layer (sense), and a dummy signal layer (dummy). The reference signal layer (reference), the sensing channel layer (sense), and the dummy signal layer are respectively connected to a scanning channel of a capacitive scanning chip.
[0024] Figure 2 As shown, Cx is the capacitance between sense and reference, Cdr is the capacitance between reference and dummy, Cds is the capacitance between sense and dummy, Cgr is the reference-to-ground capacitance, Cgs is the sense-to-ground capacitance, and Cgd is the dummy-to-ground capacitance.
[0025] The normal sense, reference and dummy are respectively connected to different pins of the touch chip, as shown in Figure 3 When there is no touch on the button, the voltage on sense and reference is the same, at this time, a comparator in the touch chip can obtain that the change of the capacitance between the two ends is 0V.
[0026] As shown in Figure 4 When the finger touches the button, since the human finger carries moisture and is also a good conductor, when the finger touches sense, the finger capacitance is incorporated into sense, so that a small voltage difference appears between the original balanced R and S, as shown in Figure 5 At this time, the comparator adc in the touch chip measures that the capacitance between the two ends is no longer 0V, that is, it is determined that there is a hand touch.
[0027] Figure 6 The equivalent circuit diagram of the finger. As can be seen from the figure, the finger can be equivalent to a resistance in series with a capacitance connected to ground.
[0028] The above is only the preferred specific implementation of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.
Claims
1. A graphical structure of touch keys, characterized in that, Comprise: a reference signal layer, an inductive channel layer, an excitation signal layer; The reference signal layer and the inductive channel layer are arranged on the same side of the excitation signal layer.
2. The graphic structure according to claim 1, characterized in that, The inductive channel layer is square, and the reference signal layer is arranged around the periphery of the inductive channel layer, and the reference signal layer is close to but not in contact with the inductive channel layer.
3. The graphic structure according to claim 1 or 2, characterized in that, The outer side of the reference signal layer is located within the outermost side of the excitation signal layer.
4. The graphic structure according to claim 1 or 2, characterized in that, The reference signal layer, the inductive channel layer and the excitation signal layer have a dielectric layer therebetween.
5. The graphic structure according to claim 1 or 2, characterized in that, The reference signal layer and the inductive channel layer are attached to one side of the film material, and the excitation signal layer is attached to the other side of the film material.
6. The graphic structure according to claim 1, characterized in that, The reference signal layer, the inductive channel layer and the excitation signal layer are respectively connected to the scanning channels of an external capacitive scanning chip.