CN217770051U - Touch key - Google Patents

Abstract

The utility model discloses a touch key, which comprises a light transmission module and a touch feedback mechanism; the touch feedback mechanism comprises a photosensitive transmitting module, a photosensitive receiving module, a processor and an isolating module; the photosensitive receiving module is electrically connected with the processor; an isolation module is arranged between the photosensitive transmitting module and the photosensitive receiving module; the transmitting end of the photosensitive transmitting module faces the light transmitting module, and the receiving end of the photosensitive receiving module faces the light transmitting module. A touch key solves the problem that the existing key is influenced by the mechanical life or is insensitive.

Description

Touch key

Technical Field

The utility model relates to a button technical field, especially a touch button.

Background

Keys are an essential function on household appliances. The key is distinguished whether to trigger or not by acquiring the variable quantity of different signals and comparing. The traditional physical key realizes level change by combining a mechanical structure with electrical characteristics, and the processor identifies whether the key acts to realize the purposes of different functions such as controlling a fan, turning on illumination and the like through the collected level change. The capacitance touch key realizes the key function by collecting capacitance variation. Mechanical keys and capacitive touch keys are commonly used in home electronics.

At present, keys on large household appliances such as a cigarette machine, a dish washing machine, a refrigerator and a washing machine generally adopt mechanical keys or capacitive touch keys. Mechanical keys need to be triggered by applying certain stress, are greatly influenced by the service life of machinery, are difficult to structurally prevent dust and water, and are easy to influence the aesthetic appearance. The capacitive touch keys generally adopt capacitive sensing touch, can avoid mechanical stress, can detect key input by only lightly touching, are not influenced by mechanical service life, are not influenced by spatial structure, are beneficial to appearance design and greatly improve aesthetic standard; however, the use of the capacitor touch keys is limited to non-metal panels, such as plastic and glass surfaces. If the capacitive touch keys are used on a metal panel or a plastic panel welded with metal components, the phenomenon of failure or insensitivity is easy to occur.

SUMMERY OF THE UTILITY MODEL

To the above-mentioned defect, the utility model aims to provide a touch button has solved current button and has received mechanical life influence or insensitive problem.

To achieve the purpose, the utility model adopts the following technical proposal: a touch key comprises a light-transmitting module and a touch feedback mechanism;

the touch feedback mechanism comprises a photosensitive transmitting module, a photosensitive receiving module, a processor and an isolating module;

the photosensitive receiving module is electrically connected with the processor; an isolation module is arranged between the photosensitive transmitting module and the photosensitive receiving module;

the transmitting end of the photosensitive transmitting module faces the light-transmitting module, and the receiving end of the photosensitive receiving module faces the light-transmitting module.

It is worth to be noted that the photosensitive emission module is an infrared emission diode IR7, and the anode of the photosensitive emission module is electrically connected with a power supply VCC;

the touch feedback mechanism further comprises an infrared transmitting circuit, the infrared transmitting circuit comprises an NPN triode Q18, a collector of the NPN triode Q18 is electrically connected with a negative electrode of the photosensitive transmitting module, an emitting electrode of the NPN triode Q18 is grounded, a base electrode of the NPN triode Q18 is electrically connected with an output end I/O1 of the processor, and the processor is used for generating pulses with fixed frequency at the output end I/O1 of the processor.

Optionally, the infrared transmitting circuit further includes a resistor Ri, and the anode of the photosensitive transmitting module is electrically connected to the power VCC through the resistor Ri.

Specifically, the infrared emission circuit further includes a resistor R135, and the base of the NPN triode Q18 is electrically connected to the output terminal of the processor through the resistor R135.

Preferably, the infrared emission circuit further includes a resistor R137, and the base of the NPN transistor Q18 is electrically connected to the emitter of the NPN transistor Q18 through the resistor R137.

It is worth to be noted that the photosensitive receiving module is an infrared photosensitive diode PT7, and the anode of the photosensitive receiving module is electrically connected with a power supply VCC;

the touch feedback mechanism further comprises an infrared receiving circuit, the infrared receiving circuit comprises a resistor R136, one end of the resistor R136 is electrically connected with the negative electrode of the photosensitive receiving module, one end of the resistor R136 is further electrically connected with the input end I/O2 of the processor, and the other end of the resistor R136 is grounded.

Optionally, the infrared receiving circuit further comprises a low-pass filter, and one end of the resistor R136 is electrically connected to the input I/O2 of the processor through the low-pass filter.

Specifically, the low-pass filter includes a resistor R134 and a capacitor C50, one end of the resistor R134 is electrically connected to one end of the resistor R136, the other end of the resistor R134 is electrically connected to the input I/O2 of the processor after being connected in parallel to one end of the capacitor C50, and the other end of the capacitor C50 is grounded.

Preferably, the infrared receiving circuit further comprises a capacitor C49, one end of the capacitor C49 is electrically connected to the positive electrode of the photosensitive receiving module, and the other end of the capacitor C49 is electrically connected to the negative electrode of the photosensitive receiving module.

It is worth to say that, the touch feedback mechanism still includes shielding module and panel, and the printing opacity module is seted up in the panel, and the upside butt of shielding module forms the shielding cavity in the bottom surface of panel, and the shielding cavity is located the printing opacity module under, and photosensitive emission module, photosensitive receiving module and isolation module all set up in the shielding cavity.

One of the above technical solutions has the following beneficial effects: in the touch button, utilize photosensitive emission module, photosensitive receiving module and printing opacity module, the light that photosensitive emission module produced is launched towards the printing opacity module, and owing to set up isolation module, add between photosensitive emission module and photosensitive receiving module and keep apart, isolation module keeps apart light transmission and receipt as far as, avoids photosensitive emission module's light direct action on photosensitive receiving module, so, the light that photosensitive emission module transmitted can not spread photosensitive receiving module. When the light-transmitting module is not touched, the photosensitive receiving module cannot receive the light emitted by the photosensitive emitting module, the photosensitive emitting module does not act, and the processor cannot receive a key instruction, so that the condition that no key action occurs is judged; when a user touches the transparent module with a finger, the finger of the user shields the light generated by the photosensitive emitting module from diffusing outwards, and part of the light generated by the photosensitive emitting module can be reflected to the photosensitive receiving module through the finger, then the photosensitive receiving module acts, and the processor receives a key instruction to judge that the key action occurs. Compared with a mechanical key, the touch key of the utility model is not affected by mechanical service life and space structure, is favorable for appearance design, and greatly improves aesthetic standard; compare with electric capacity touch button, the utility model discloses a touch button is owing to utilized the principle of light reflection, can not confine to non-metallic panel to avoid touch button to use and appear inefficacy or insensitive phenomenon easily on metal decking or the plastic panel who welds the metal composition, improved the sensitivity.

Drawings

Fig. 1 is an exploded view of a touch key in an embodiment of the present invention;

fig. 2 is a circuit diagram of an infrared transmitting circuit and an infrared receiving circuit according to an embodiment of the present invention;

wherein: 1, a light-transmitting module; 2 touching a feedback mechanism; 21 a photosensitive emission module; 22 a photosensitive receiving module; 24 isolating the module; 25 an infrared emitting circuit; 26 an infrared receiving circuit; 27 a shielding module; 28 shielding the cavity; 3, a panel; 4PCBA circuit board.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are exemplary only for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

A touch key according to an embodiment of the present invention is described below with reference to fig. 1 to 2, including a light transmission module 1 and a touch feedback mechanism 2; the touch feedback mechanism 2 comprises a photosensitive transmitting module 21, a photosensitive receiving module 22, a processor and an isolating module 24; the photosensitive receiving module 22 is electrically connected with the processor; an isolation module 24 is arranged between the photosensitive transmitting module 21 and the photosensitive receiving module 22; the transmitting end of the photosensitive transmitting module 21 faces the light transmitting module 1, and the receiving end of the photosensitive receiving module 22 faces the light transmitting module 1. It is worth to be noted that the touch feedback mechanism 2 is arranged right below the light-transmitting module 1, the light-transmitting module 1 can transmit light, and when the photosensitive emitting module 21 emits light, the light can be diffused to the outside through the light-transmitting module 1; the processor is preferably a MCU. The isolation module 24 is preferably a light-tight plate.

In the touch key, by utilizing the photosensitive transmitting module 21, the photosensitive receiving module 22 and the light-transmitting module 1, the light generated by the photosensitive transmitting module 21 is transmitted towards the light-transmitting module 1, and because the isolating module 24 is arranged, isolation is added between the photosensitive transmitting module 21 and the photosensitive receiving module 22, the light transmission and the light receiving are isolated as much as possible by the isolating module 24, the light of the photosensitive transmitting module 21 is prevented from directly acting on the photosensitive receiving module 22, and therefore, the light transmitted by the photosensitive transmitting module 21 cannot be diffused to the photosensitive receiving module 22. When the light-transmitting module 1 is not touched, the photosensitive receiving module 22 cannot receive the light emitted by the photosensitive emitting module 21, the photosensitive emitting module 21 does not act, and the processor cannot receive a key instruction, so that the condition that no key action occurs is judged; when a user touches the transparent module 1 with a finger, the finger of the user shields the light generated by the photosensitive emitting module 21 to diffuse outwards, and part of the light generated by the photosensitive emitting module 21 is reflected to the photosensitive receiving module 22 through the finger, then the photosensitive receiving module 22 acts, and the processor receives a key instruction to judge that the key action occurs. Compared with a mechanical key, the touch key of the utility model is not affected by mechanical service life and space structure, is favorable for appearance design, and greatly improves aesthetic standard; compare with electric capacity touch button, the utility model discloses a touch button is owing to utilized the principle of light reflection, can not confine to non-metallic panel to avoid touch button to use and appear inefficacy or insensitive phenomenon easily on metal decking or the plastic panel who welds the metal composition, improved the sensitivity.

In some embodiments, the photosensitive emission module 21 is an infrared emission diode IR7, and the anode of the photosensitive emission module 21 is electrically connected to a power source VCC; the touch feedback mechanism 2 further comprises an infrared emitting circuit 25, the infrared emitting circuit 25 comprises an NPN triode Q18, a collector of the NPN triode Q18 is electrically connected with a cathode of the photosensitive emitting module 21, an emitter of the NPN triode Q18 is grounded, a base of the NPN triode Q18 is electrically connected with an output end I/O1 of the processor, and the processor is used for generating pulses with fixed frequency at the output end I/O1 of the processor. As shown in fig. 2, the output I/O1 of the processor provides a fixed frequency pulse to the base of NPN transistor Q18 to control the saturation on-time and off-time of NPN transistor Q18, thereby driving infrared emitting diode IR7; when the NPN triode Q18 is conducted, a circuit formed by a power supply VCC, the infrared emitting diode IR7, the collector of the NPN triode Q18, the emitter of the NPN triode Q18 and the ground is conducted, and the infrared emitting diode IR7 is electrified to work so as to emit infrared light; when the NPN transistor Q18 is turned off, a circuit formed by the power supply VCC, the infrared emitting diode IR7, the collector of the NPN transistor Q18, the emitter of the NPN transistor Q18, and the ground is not turned on, and the infrared emitting diode IR7 does not get charged and does not operate. By controlling the saturation conduction time and the cut-off time of the NPN triode Q18, the collector and the emitter of the NPN triode Q18 can be prevented from being in a conduction state for a long time, thereby preventing the infrared emitting diode IR7 from being in a working state for a long time, and further preventing the infrared emitting diode IR7 from shortening the service life due to long-term working.

It should be noted that the infrared transmitting circuit 25 further includes a resistor Ri, and the anode of the photosensitive transmitting module 21 is electrically connected to the power source VCC through the resistor Ri. Resistor Ri functions as a current limiting means to prevent the current from being inputted from power supply VCC to infrared emitting diode IR7 from being too large to damage infrared emitting diode IR7.

Optionally, the infrared emitting circuit 25 further includes a resistor R135, and the base of the NPN transistor Q18 is electrically connected to the output terminal of the processor through the resistor R135. Resistor R135 acts as a current limiting function to prevent excessive current from being input to the base of NPN transistor Q18 by the processor and damaging NPN transistor Q18.

Specifically, the infrared transmitting circuit 25 further includes a resistor R137, and the base of the NPN transistor Q18 is electrically connected to the emitter of the NPN transistor Q18 through the resistor R137. The resistor R137 is a pull-down resistor, and provides a reference control low level when the level of the output terminal of the processor is uncertain before the processor is reset at the power-on moment, so that the collector and the emitter of the NPN transistor Q18 are kept in a cut-off state.

Preferably, the photosensitive receiving module 22 is an infrared photodiode PT7, and the anode of the photosensitive receiving module 22 is electrically connected to a power supply VCC; the touch feedback mechanism 2 further comprises an infrared receiving circuit 26, wherein the infrared receiving circuit 26 comprises a resistor R136, one end of the resistor R136 is electrically connected with the negative electrode of the photosensitive receiving module 22, one end of the resistor R136 is further electrically connected with the input terminal I/O2 of the processor, and the other end of the resistor R136 is grounded. The output terminal I/O2 of the processor is used for collecting voltage at two ends of the resistor R136, the infrared photosensitive diode PT7 changes current flowing through the infrared photosensitive diode PT7 by detecting the intensity of infrared light, the current flowing through the infrared photosensitive diode PT7 passes through the resistor R136, and voltage is formed at two ends of the resistor R136. After infrared photodiode PT7 receives the infrared light that infrared emission diode IR7 sent, infrared photodiode PT 7's resistance reduces, and the electric current that flows through infrared photodiode PT7 increases, and the voltage that adds at resistance R136 both ends will increase, and like this, the voltage that the output I/O2 of treater gathered will increase to it takes place to judge that there is the button action.

In some embodiments, the infrared receiving circuit 26 further comprises a low-pass filter, and one end of the resistor R136 is electrically connected to the input I/O2 of the processor through the low-pass filter. The low-pass filter plays a role in filtering high-frequency signals, so that the high-frequency signals are prevented from being transmitted to the input end of the processor, and misjudgment of the processor is avoided.

It should be noted that the low-pass filter includes a resistor R134 and a capacitor C50, one end of the resistor R134 is electrically connected to one end of the resistor R136, the other end of the resistor R134 is electrically connected to the input I/O2 of the processor after being connected in parallel to one end of the capacitor C50, and the other end of the capacitor C50 is grounded. The low-pass filter composed of the resistor R134 and the capacitor C50 can filter out high-frequency signals passing through the infrared photosensitive diode PT 7.

Optionally, the infrared receiving circuit 26 further includes a capacitor C49, one end of the capacitor C49 is electrically connected to the positive electrode of the photosensitive receiving module 22, and the other end of the capacitor C49 is electrically connected to the negative electrode of the photosensitive receiving module 22. The capacitor C49 is connected in parallel with two ends of the infrared photosensitive diode PT7 so as to improve the dynamic response of the infrared photosensitive diode PT 7. In another embodiment, the capacitor C49 is connected in series with the resistor and then connected in parallel to two ends of the infrared photodiode PT7, which also plays a role in improving the dynamic response of the infrared photodiode PT 7.

Specifically, the touch feedback mechanism 2 further includes a shielding module 27 and a panel 3, the light-transmitting module 1 is disposed on the panel 3, an upper side of the shielding module 27 abuts against a bottom surface of the panel 3 and forms a shielding cavity 28, the shielding cavity 28 is located right below the light-transmitting module 1, and the photosensitive transmitting module 21, the photosensitive receiving module 22 and the isolation module 24 are all disposed in the shielding cavity 28. The shielding module 27 is preferably a light-tight plate, and the shielding module 27 can place both the photosensitive transmitting module 21 and the photosensitive receiving module 22 in the shielding cavity 28 to minimize the influence of external light on the photosensitive receiving module 22. The panel 3 is of a light-tight metal structure, the light-transmitting module 1 is preferably an icon with a designated shape hollowed out on the panel 3, and the hollowed-out area on the icon can emit light, so that the light-sensitive emitting module 21 can only diffuse the light to the outside through the light-transmitting module 1, when a user places fingers on the light-transmitting module 1, the light emitted by the light-sensitive emitting module 21 can be blocked as much as possible, and the light can be reflected to the light-sensitive receiving module 22 as much as possible. Specifically, the lower side of the shielding module 27 is connected with the PCBA circuit board 4, and the infrared transmitting circuit 25 and the infrared receiving circuit 26 are welded on the PCBA circuit board 4.

Other configurations and operations of a touch key according to embodiments of the present invention are known to those skilled in the art and will not be described in detail herein.

In the description herein, references to the description of the terms "embodiment," "example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A touch key, comprising: the system comprises a light transmission module and a touch feedback mechanism;

the touch feedback mechanism comprises a photosensitive transmitting module, a photosensitive receiving module, a processor and an isolating module;

the photosensitive receiving module is electrically connected with the processor; the isolation module is arranged between the photosensitive transmitting module and the photosensitive receiving module;

the transmitting end of the photosensitive transmitting module faces the light-transmitting module, and the receiving end of the photosensitive receiving module faces the light-transmitting module.

2. The touch key of claim 1, wherein: the photosensitive emission module is an infrared emission diode IR7, and the anode of the photosensitive emission module is electrically connected with a power supply VCC;

the touch feedback mechanism further comprises an infrared transmitting circuit, the infrared transmitting circuit comprises an NPN triode Q18, a collector of the NPN triode Q18 is electrically connected with a cathode of the photosensitive transmitting module, an emitter of the NPN triode Q18 is grounded, a base of the NPN triode Q18 is electrically connected with an output end I/O1 of the processor, and the processor is used for generating pulses with fixed frequency at the output end I/O1 of the processor.

3. The touch key of claim 2, wherein: the infrared transmitting circuit further comprises a resistor Ri, and the anode of the photosensitive transmitting module is electrically connected with a power supply VCC through the resistor Ri.

4. The touch key of claim 2, wherein: the infrared emission circuit further comprises a resistor R135, and the base of the NPN triode Q18 is electrically connected with the output end of the processor through the resistor R135.

5. The touch key of claim 2, wherein: the infrared emission circuit further comprises a resistor R137, and the base electrode of the NPN triode Q18 is electrically connected with the emitter electrode of the NPN triode Q18 through the resistor R137.

6. The touch key of claim 1, wherein: the photosensitive receiving module is an infrared photosensitive diode PT7, and the anode of the photosensitive receiving module is electrically connected with a power supply VCC;

the touch feedback mechanism further comprises an infrared receiving circuit, the infrared receiving circuit comprises a resistor R136, one end of the resistor R136 is electrically connected with the negative electrode of the photosensitive receiving module, one end of the resistor R136 is further electrically connected with an input end I/O2 of the processor, and the other end of the resistor R136 is grounded.

7. The touch key of claim 6, wherein: the infrared receiving circuit further comprises a low-pass filter, and one end of the resistor R136 is electrically connected with the input end I/O2 of the processor through the low-pass filter.

8. The touch key of claim 7, wherein: the low-pass filter comprises a resistor R134 and a capacitor C50, one end of the resistor R134 is electrically connected with one end of the resistor R136, the other end of the resistor R134 is electrically connected with the input end I/O2 of the processor after being connected with one end of the capacitor C50 in parallel, and the other end of the capacitor C50 is grounded.

9. The touch key of claim 6, wherein: the infrared receiving circuit further comprises a capacitor C49, one end of the capacitor C49 is electrically connected with the positive electrode of the photosensitive receiving module, and the other end of the capacitor C49 is electrically connected with the negative electrode of the photosensitive receiving module.

10. The touch key of claim 1, wherein: touch feedback mechanism still includes shielding module and panel, the printing opacity module is seted up in the panel, the upside butt of shielding module in the bottom surface of panel forms the shielding cavity, the shielding cavity is located under the printing opacity module, photosensitive emission module, photosensitive receiving module and isolation module all set up in the shielding cavity.

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