Touch feedback device
By using ITO film, polyvinyl chloride gel and boost drive circuit in the tactile feedback device, the problem of high linear motor cost in the prior art is solved, and the low-cost and low-volume tactile feedback effect is achieved, which is suitable for a variety of electronic devices.
Patent Information
- Application Number
- CN202510431691.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-08
- Publication Date
- 2025-06-10
AI Technical Summary
Existing haptic feedback devices rely on expensive and large linear motors, resulting in high application costs and are difficult to widely use in most electronic devices.
Tactile feedback is achieved by collecting touch signals and driving the gel device to vibrate.
It achieves low-cost and low-volume tactile feedback effect, reduces application costs, is suitable for a variety of electronic devices, and has low power consumption and long service life.
Smart Images
Figure CN120122828A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the field of operation feedback devices, and specifically relates to a tactile feedback device. Background Art
[0002] Operation feedback systems are widely used in electronic devices. Common operation feedback systems include optical feedback, sound feedback, and tactile feedback (also known as vibration feedback) systems. The optical feedback system usually refers to the situation where, when a user and a device perform a series of interactive operations, the device emits light to remind the user to perform the operation; sound feedback is the situation where the device emits sound to remind the user to perform the operation; tactile feedback is the situation where the device vibrates to remind the user to perform the operation. Since the hardware of optical feedback and sound feedback is inexpensive, they are widely used in electronic products. However, due to its characteristics such as quietness, no light pollution, strong adaptability, and friendliness to disabled people, vibration feedback has irreplaceable uses in the fields of home, noisy places, and special equipment.
[0003] In the prior art, tactile feedback mainly relies on the vibration of a linear motor. However, the linear motor has a certain volume and is expensive. Currently, it is mainly used in mobile phones and high-value-added electronic devices. Therefore, finding a vibration feedback device with a low price and a small volume can greatly reduce the application cost of tactile feedback. Summary of the Invention
[0004] This application provides a tactile feedback device to solve the problems in the background art. This device uses a touch acquisition sensor (such as an ITO film), a polyvinyl chloride gel device, and a boost drive circuit as a module group. By collecting touch signals and using this signal as the start signal of the boost drive circuit, it drives the polyvinyl chloride gel device to vibrate, thereby achieving the effect of touch feedback vibration.
[0005] To achieve the above object, this application adopts the following technical solutions: A tactile feedback device includes a touch signal acquisition layer (1), a metal mesh (2), a polyvinyl chloride gel (3), a metal foil (4), and a drive circuit (5). The drive circuit (5) has 1 signal input terminal (5.1), 1 power input terminal (5.2), and a power output terminal (5.3). The signal input terminal is electrically connected to the touch signal acquisition layer (1). The power input terminal is externally connected to a working voltage of 5V DC. The power output terminal outputs a square wave voltage signal of 220V - 250V during operation and outputs a voltage of 0V in a non-working state. The positive pole of the power output terminal is electrically connected to the metal mesh (2), and the negative pole is electrically connected to the metal foil (4); When the user touches or presses the touch signal acquisition layer (1), this layer will transmit an electrical signal to the drive circuit (5) as an input signal. When receiving the touch signal, this circuit can boost the voltage to 220V - 250V and drive the polyvinyl chloride gel (3) to deform towards the metal mesh (2). The metal mesh (2), polyvinyl chloride gel (3), and metal foil (4) form a vibration unit. When the voltage signal of the drive circuit (5) is output in the form of an on - off square wave, it can cause the polyvinyl chloride gel (3) to be in a continuous state of deformation - restoration, thereby achieving the vibration effect.
[0006] In the above - mentioned technical solution, there are the following further preferred solutions: The preferred solutions for the signal acquisition layer (1) include capacitive sensor films, such as ITO films and ceramic capacitive pressure sensors; piezoelectric sensor films, such as PVDF (polyvinylidene fluoride) films.
[0007] The metal mesh (2) is a copper mesh or a stainless - steel iron mesh, preferably a brass mesh, with a mesh diameter of 40 - 80 meshes, preferably 60 meshes, and a wire diameter of 0.12 - 0.15 mm.
[0008] The thickness of the polyvinyl chloride gel (3) is 0.1 - 0.3 mm, preferably 0.2 mm.
[0009] The metal foil (4) is selected from aluminum foil or copper foil, with a thickness of 0.04 - 0.12 mm, preferably 0.08 mm.
[0010] Furthermore, the vibration unit composed of the metal mesh (2), polyvinyl chloride gel (3), and metal foil (4) can further achieve a stronger vibration effect by increasing the number of layers. The structure of the layers is arranged in sequence as metal mesh - polyvinyl chloride gel - metal foil - polyvinyl chloride gel - metal mesh repeatedly.
[0011] (III) Beneficial effects The device of this application has a simple structure, and the overall device structure occupies a small volume. It can attach the device behind the keys of common electronic devices. When the user presses or touches the keys, the vibration module below vibrates. This solution is applicable to scenarios with large areas and narrow spaces that require vibration solutions, thereby achieving the function of replacing the linear motor and having excellent economy. The power consumption of this device is lower than that of the linear motor, and it has a long service life, with excellent environmental protection properties. Brief description of the drawings
[0012] Figure 1 It is a schematic diagram of the overall structure of this application.
[0013] Figure 2 It is the drive circuit diagram of this application.
[0014] Figure 3This is a physical photo of the driving circuit of the present application. In the figure, A is the output wire of the driving circuit, and B is the vibration unit.
[0015] Figure 4 This is a physical photo of the commercial product of the present application. Detailed implementation manners
[0016] The technical solutions, usage methods, installation sequences, and material properties of the present application will be clearly and completely described below in conjunction with the attached drawings of the present application. For orientation terms such as "upper", "lower", "left", and "right", when not specifically stated, they all refer to the positions seen by the human eye in the corresponding attached drawings.
[0017] Any raw materials used in this embodiment, if the source is not specifically stated, are all conventional raw materials that can be purchased in the market. The polyvinyl chloride gel used in this embodiment refers to the method disclosed in the applicant's CN202310066668.5. Dibutyl adipate and tetrahydrofuran are stirred until fully mixed, and while maintaining the stirring state, PVC powder is added. Then, a casting film is made through a casting machine to obtain a polyvinyl chloride gel film. In addition, due to reasons such as the long development device test and debugging cycle and the high test and detection costs, all experimental supplies in the following embodiments, such as the ITO film used for the touch signal acquisition layer (1), the brass mesh with a mesh diameter of 60 meshes and a wire diameter of 0.15 mm used for the metal mesh (2), and the copper foil with a thickness of 0.08 mm selected for the metal foil (4).
[0018] Refer to Figure 1 , a tactile feedback device, including a touch signal acquisition layer (1), a metal mesh (2), a polyvinyl chloride gel (3), a metal foil (4), and a driving circuit (5). The driving circuit (5) has 1 signal input terminal (5.1), 1 power input terminal (5.2), and a power output terminal (5.3). The signal input terminal is electrically connected to the touch signal acquisition layer (1), the positive pole (5.3+) of the power output terminal is connected to the metal mesh (2), and the negative pole (5.3-) is connected to the metal foil (4). At this time, the assembly of the device of the present application is completed, and when a 5V 1A power supply is connected to the power input terminal (5.2), it can enter the standby state.
[0019] Refer to Figure 2 , Figure 2It is a design diagram of a driving circuit. This circuit can detect the behavior of a human hand touching a button and use a microcontroller (MCU) to output a PWM (pulse width modulation) signal with a specific frequency and voltage to drive the PVC gel to produce a contraction and vibration effect. The entire system uses precise touch sensors to achieve sensitive detection of human hand contact, ensuring a short and accurate response time. When the user touches the button, the touch sensor immediately generates a signal and sends it to the MCU immediately. After the MCU analyzes the signal according to the preset program, it outputs the corresponding PWM signal. The frequency and voltage of the PWM signal can be programmed and adjusted according to requirements, so as to effectively drive the PVC gel. This process can not only cause the contraction of the PVC gel, but also produce a vibration effect, providing intuitive feedback to the user. To ensure the stability and performance of the circuit, power management and signal integrity are particularly considered in the design. In addition, by optimizing the component layout and PCB design, the anti-interference ability and overall reliability of the circuit are enhanced.
[0020] It should be noted that Figure 1 the simplified diagram of the driving circuit does not fully represent Figure 2 For example, for the signal input terminal (5.1), although only 1 is drawn in Figure 1 , in actual use, there are often multiple pins for the ITO film signal input end, Figure 2 and the circuit diagram with multiple pins is given in
[0021] When the user touches or presses the ITO film of the touch signal acquisition layer, this layer will transmit a signal to the driving circuit (5) as an input signal. When receiving the touch signal, the driving circuit can boost the voltage to a 220V - 250V square wave voltage and drive the polyvinyl chloride gel (3) to deform towards the metal mesh (2) for about 0.05 - 0.1 seconds, causing the polyvinyl chloride gel (3) to be in a continuous state of deformation - restoration, thereby achieving the vibration effect.
[0022] Referring to Figure 3 , Figure 3 is a PCB board made according to the circuit design of Figure 2 . To clearly show the working principle of this device, Figure 3 a simplified ITO film and a simplified square vibration unit composed of a metal mesh (2), a polyvinyl chloride gel (3), and a metal foil (4) are used, and the power supply wires are hidden. Figure 3Among the three pictures, the first two pictures are the front and back sides of the PCB board. The ITO film is connected to the board through the FPC connector as the signal input terminal. The exposed wire A is the output wire of the driving circuit (5), which is respectively connected to the vibration units indicated by the arrow B. In the third picture, the ITO film is located above the square vibration unit. When touching the ITO film with the hand, this layer sends a signal to the driving circuit (5) through the FPC connector to turn on the working circuit. The driving circuit (5) boosts the voltage and outputs it to the square vibration unit to cause vibration, realizing tactile feedback.
[0023] Refer to Figure 4 , Figure 4 is the commercial solution of this application. In the left picture, one end of the ITO pin of the touch panel of the washing machine is connected to the control circuit of a conventional manufacturer, and the other end of the ITO pin is connected to the driving circuit through the FPC connector. In the right picture, there are protective frames such as adhesive strips and sponges on the back of the touch panel. The middle hollow part is filled with a vibration unit composed of a metal mesh, polyvinyl chloride gel, and metal foil, and finally pasted on the frame of the product itself. The thickness of the vibration feedback module provided by this technical solution is only 0.78 mm, the coverage area reaches 5000 square millimeters, and the cost is about 0.2 yuan. It is an application scenario that cannot be achieved by the linear motor technical solution. At the same time, the technical solution of this application provides a good choice of feedback mechanism for some people with hearing impairments, visual impairments, or those who dislike the light pollution and noise pollution of household appliances.
[0024] This application discloses the combined use method of traditional ITO film sensors and polyvinyl chloride gel vibration device units. For other application scenarios not disclosed in this application, such as making a keyboard and mouse with vibration feedback functions using equivalent technical solutions, or improving the waterproof and dustproof performance of the technical solution of this application by adding some protective measures, and furthermore, obtaining a better vibration experience by optimizing the circuit, all belong to the technical solutions derived from this application and should all fall within the protection scope of this application.
Claims
1. A tactile feedback device, characterized in that: The invention comprises a touch signal collection layer (1), a metal mesh (2), a polyvinyl chloride gel (3), a metal foil (4), and a drive circuit (5). The drive circuit (5) has a signal input terminal (5.1), a power input terminal (5.2), and a power output terminal (5.3). The signal input terminal is connected to the touch signal collection layer (1) circuit. The external working voltage of the power input terminal is a direct current of 5V. The power output terminal outputs a 220V-250V square wave voltage signal when working and outputs a voltage of 0V when not working. The positive electrode of the power output terminal is connected to the metal mesh (2), and the negative electrode is connected to the metal The foil (4) is turned on, and when the touch signal collection layer (1) is working, it transmits an electrical signal to the driving circuit (5) as an input signal. When receiving the input signal, the driving circuit (5) increases the voltage to 220V-250V, and drives the polyvinyl chloride gel (3) to deform toward the metal mesh (2). The metal mesh (2), the polyvinyl chloride gel (3), and the metal foil (4) form a vibration unit. When the voltage signal of the driving circuit (5) is output in the form of an on-off square wave, the polyvinyl chloride gel (3) can be caused to be in a state of continuous deformation-recovery, thereby achieving a vibration effect.
2. A tactile feedback device according to claim 1, characterized in that: The preferred schemes of the signal collection layer (1) include capacitive sensor films, ITO films, ceramic capacitor pressure sensors; piezoelectric sensor films, PVDF (polyvinylidene fluoride) films.
3. The tactile feedback device according to claim 1, characterized in that: The metal mesh (2) is a copper mesh, a stainless steel mesh, preferably a brass mesh, with a mesh diameter of 40-80 mesh, preferably 60 mesh, and a wire diameter of 0.12-0.15 mm.
4. The tactile feedback device according to claim 1, characterized in that: The thickness of the polyvinyl chloride gel (3) is 0.1-0.3 mm, preferably 0.2 mm. The metal foil (4) is aluminum foil or copper foil, with a thickness of 0.04-0.12 mm, preferably 0.08 mm.
Citation Information
Patent Citations
Casting preparation method of electrically-deformed PVC (polyvinyl chloride) gel
CN116082681A