CN112817436A

CN112817436A - Tactile feedback module, thin film keyboard and electronic equipment

Info

Publication number: CN112817436A
Application number: CN201911127893.5A
Authority: CN
Inventors: 于国华; 胡盛棚
Original assignee: Nanchang OFilm Display Technology Co Ltd
Current assignee: Nanchang OFilm Display Technology Co Ltd
Priority date: 2019-11-18
Filing date: 2019-11-18
Publication date: 2021-05-18

Abstract

The application relates to a tactile feedback module, a thin film keyboard and electronic equipment, wherein the tactile feedback module comprises at least two layers of stacked conductive films, each conductive film comprises a thin film insulating layer, a conductive electrode layer and an elastic layer which are stacked, and the thin film insulating layer of one conductive film of adjacent conductive films is adjacent to the elastic layer of the other conductive film; the elastic layer is the magnetic current becomes elastomer material, through the voltage signal of applying different polarity to the conductive electrode layer in the adjacent conducting film for the tactile feedback module when sensing the touch pressure, the elastic layer produces vibration feedback under the effect of electric field force. The elastic layer is made of a magnetorheological elastomer material layer, and can effectively add a magnetic field under the action of an electric field, so that the deformation rebound speed is increased, and the recovery and rebound effects of the elastic layer are increased. The thickness of each layer in the tactile feedback module can be further compressed by changing the deformation quantity change of the voltage control elastic layer between the conductive electrode layers for tactile feedback, so that the thickness of the keyboard is reduced.

Description

Tactile feedback module, thin film keyboard and electronic equipment

Technical Field

The present application relates to the field of haptic feedback technologies, and in particular, to a haptic feedback module, a thin film keyboard and an electronic device.

Background

With the development of computer technology, more and more electronic devices have entered people's lives. After all, for example, a notebook computer is provided with a keyboard, and people perform related operations through the keyboard.

The traditional keyboard is mainly a rubber film keyboard, which comprises an elastic mechanism, a key frame and a key cap, wherein the key cap and the key frame are used for protecting the elastic mechanism and achieving the beautiful effect, the contact of the elastic mechanism is a plastic film overlapped by three layers, the upper layer and the lower layer are covered with film leads, two contacts are arranged at the position of each key, the middle plastic film does not contain any lead, the upper layer and the lower layer of conductive films are separated and insulated, and round holes are arranged at the positions of the key contacts. Under normal conditions, the upper and lower conductive films are separated by the middle layer and cannot be conducted. However, when the upper film is pressed, the upper film and the lower film are combined at the position of the opening, so that a key electric signal is generated. According to the structural design of the traditional keyboard, the thickness is higher due to the material.

Disclosure of Invention

Accordingly, it is desirable to provide a haptic feedback module, a membrane keyboard and an electronic device that can reduce the thickness of a conventional keyboard.

A haptic feedback module includes at least two stacked conductive films,

the conductive film comprises a thin film insulating layer, a conductive electrode layer and an elastic layer which are arranged in a stacked mode, wherein the thin film insulating layer of one conductive film of adjacent conductive films is adjacent to the elastic layer of the other conductive film; the elastic layer is made of a magnetorheological elastomer, and voltage signals with different polarities are applied to the conductive electrode layers in the adjacent conductive films, so that when the touch feedback module senses touch pressure, the elastic layer generates vibration feedback under the action of an electric field force.

Above-mentioned tactile feedback module through the voltage signal of applying different polarity to the conducting electrode layer in the adjacent conducting film for tactile feedback module is when sensing the touch pressure, and the elastic layer produces vibration feedback under the effect of electric field force, and the deformation volume change feedback of elastic layer forms tactile feedback on the user's finger. The elastic layer is made of a magnetorheological elastomer material layer, and can effectively add a magnetic field under the action of an electric field, so that the deformation rebound speed is increased, and the recovery and rebound effects of the elastic layer are increased. The deformation change of the voltage control elastic layer between the conductive electrode layers is changed to carry out touch feedback, so that the limitation of a mechanical structure of a key in a traditional keyboard on thickness reduction is avoided, the thickness of each layer in the touch feedback module can be further compressed, and the thickness of the keyboard is reduced.

In one embodiment, the amplitude of the vibration of the elastic layer increases as the voltage between the conductive electrode layers increases. The vibration amplitude of the elastic layer can be controllably adjusted by controlling the voltage change between the conductive electrode layers, and the operation is simple, convenient and reliable.

In one embodiment, the conductive electrode layer comprises a driving part and an electrode part which are electrically connected, the thin film insulating layer, the driving part of the conductive electrode layer and the elastic layer are arranged in a laminated manner, the electrode parts of the conductive electrode layer with the same voltage polarity are arranged in a bonded manner, and the electrode parts are respectively used as positive and negative electrodes for inputting a driving signal of the tactile feedback module.

The thin film insulating layer, the driving part of the conductive electrode layer and the elastic layer are arranged in a stacked mode, so that the product is prevented from being separated due to vibration of the product in the use vibration process, and the effect of a fixing structure is achieved. The electrode part leading out of the conductive electrode layer is attached to obtain a positive electrode and a negative electrode input by a driving signal of the touch feedback module, so that the driving signal is accessed to adjust the voltage between the conductive electrode layers, and the convenience of driving control of the touch feedback module is improved.

In one embodiment, the elastic layer has a thickness of 10 microns to 100 microns. The thickness of elastic layer designs for 10 microns-100 microns, avoids thickness to hang down to influence touch-control feedback effect excessively, still avoids the thickness too high simultaneously to lead to the excessive increase of thickness of tactile feedback module.

In one embodiment, the elastic layer comprises a plurality of individual columnar elastomers having a height of 30-50 microns. The height of the columnar elastic body is designed to be 30-50 micrometers, and deformation quantity change can be guaranteed to be generated for touch feedback of fingers of a user while the thickness of the keyboard is effectively reduced according to voltage change between the conductive electrode layers.

In one embodiment, the conductive electrode layer is a carbon paste layer or a silver paste layer. The conductive electrode layer adopts a carbon paste layer or a silver paste layer, has strong conductivity and can be matched with the overall structure of the keyboard for shape adjustment.

In one embodiment, the columnar elastic bodies are distributed in the elastic layer in a non-uniform density. The columnar elastic bodies are distributed in the elastic layer in uneven density, different areas of the elastic layer feed back different vibrations to a user during vibration, and the touch feedback effect for the user is enhanced.

A membrane keyboard comprises the tactile feedback module.

According to the film keyboard, the voltage signals with different polarities are applied to the conductive electrode layers in the adjacent conductive films, so that when the touch feedback module senses touch pressure, the elastic layer generates vibration feedback under the action of an electric field force, and deformation quantity of the elastic layer is changed and fed back to fingers of a user to form touch feedback. The elastic layer is made of a magnetorheological elastomer material layer, and can effectively add a magnetic field under the action of an electric field, so that the deformation rebound speed is increased, and the recovery and rebound effects of the elastic layer are increased. The deformation change of the voltage control elastic layer between the conductive electrode layers is changed to carry out touch feedback, so that the limitation of a mechanical structure of a key in a traditional keyboard on thickness reduction is avoided, the thickness of each layer in the touch feedback module can be further compressed, and the thickness of the keyboard is reduced.

In one embodiment, the membrane keyboard further comprises a controller, and the controller is connected with the conductive electrode layer of the tactile feedback module. The user can be according to actual demand, through the voltage of controller control drive signal who carries to the conducting electrode layer, realizes different touch feedback bounce to make the user experience different touch feedback dynamics, it is more convenient to use.

An electronic device comprises the film keyboard.

Above-mentioned electronic equipment through the voltage signal of applying different polarity to the conducting electrode layer in the adjacent conducting film for the tactile feedback module is when sensing the touch pressure, and the elastic layer produces vibration feedback under the effect of electric field force, and the deformation volume change feedback of elastic layer forms tactile feedback on the user's finger. The elastic layer is made of a magnetorheological elastomer material layer, and can effectively add a magnetic field under the action of an electric field, so that the deformation rebound speed is increased, and the recovery and rebound effects of the elastic layer are increased. The deformation change of the voltage control elastic layer between the conductive electrode layers is changed to carry out touch feedback, so that the limitation of a mechanical structure of a key in a traditional keyboard on thickness reduction is avoided, the thickness of each layer in the touch feedback module can be further compressed, and the thickness of the keyboard is reduced.

Drawings

FIG. 1 is a diagram illustrating a conductive film structure of a haptic feedback module in an embodiment;

FIG. 2 is a schematic diagram of a multi-layer staggered stack process in one embodiment;

FIG. 3 is a schematic diagram illustrating the completion of a multi-layered, interleaved stack of the final product according to an embodiment;

FIG. 4 is a schematic diagram of an embodiment of an elastic layer;

FIG. 5 is a schematic diagram of driving signals input to a conductive electrode layer according to an embodiment;

FIG. 6 is a diagram illustrating an embodiment of a haptic feedback module with zero deformation in the elastic layer;

FIG. 7 is a diagram illustrating an embodiment of a haptic feedback module with a maximum amount of deformation of an elastic layer;

FIG. 8 is a diagram illustrating an embodiment of a tactile feedback module with a maximum return of the amount of deformation of the elastic layer to zero;

FIG. 9 is a diagram illustrating the finger contact haptic feedback module with zero deflection in the elastic layer according to one embodiment;

FIG. 10 is a diagram illustrating the finger contacting the haptic feedback module when the amount of deformation of the elastic layer is maximized, according to an embodiment;

fig. 11 is a schematic structural diagram of a membrane keyboard in an embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

In one embodiment, there is provided a haptic feedback module, wherein at least two conductive films are stacked, and as shown in fig. 1, the conductive films include a thin film insulation layer 110, a conductive electrode layer 120 and an elastic layer 130, which are sequentially stacked, wherein the thin film insulation layer 110 of one conductive film of adjacent conductive films is adjacent to the elastic layer 130 of the other conductive film; the elastic layer 130 is made of a magnetorheological elastomer material, and voltage signals with different polarities are applied to the conductive electrode layers 120 in the adjacent conductive films, so that when the tactile feedback module senses touch pressure, the elastic layer 130 generates vibration feedback under the action of an electric field force.

Wherein, the external controller can control the input of the driving signal to the conductive electrode layer 120 of each conductive film in the haptic feedback module, so that the voltage polarities of the two conductive electrode layers 120 of the adjacent conductive films are opposite. Further, the voltage between the two conductive electrode layers 120 of the adjacent conductive films may also be controlled to periodically change, so that the vibration amplitude of the elastic layer 130 between the conductive electrode layers 120 also periodically changes. The magnetorheological elastomer is prepared by doping micrometer-scale ferromagnetic particles into a high-molecular polymer and curing the mixture in a magnetic field environment so that the particles in a matrix have a chain or columnar structure. The elastic modulus of the magnetorheological elastomer can be changed along with the intensity of an external magnetic field, and the magnetorheological elastomer not only has the high technical characteristics of controllability, reversibility, quick response and the like, but also has the unique advantages of good stability and the like. The elastic layer 130 is made of a magnetorheological elastomer material, and can effectively add a magnetic field under the action of an electric field, so that the deformation rebound speed is increased, and the recovery and rebound effects of the elastic layer are increased.

Specifically, the elastic layer 130 may include mutually independent columnar elastic bodies, the thin film insulation layer 110 is located at the outermost layer of the conductive film, and the thin film insulation layer 110 is made of a non-conductive material at the contact surface between the conductive electrode layer 120 and the user, so as to play an insulation protection role, and at the same time, the thin film insulation layer can be separated from the outside air, so as to prevent the conductive electrode layer 120 from being oxidized and play a waterproof evasion role. The conductive electrode layers 120 in each conductive film are correspondingly arranged, the elastic layer 130 is arranged between every two adjacent conductive electrode layers 120, the vibration amplitude of the elastic layer 130 between the conductive electrode layers 120 is periodically changed along with the periodic change of the voltage between the two adjacent conductive electrode layers 120, and the deformation quantity change of the elastic layer 130 is fed back to the finger of the user to form the tactile feedback.

In the tactile feedback module, voltage signals with different polarities are applied to the conductive electrode layers 120 in the adjacent conductive films, so that when the tactile feedback module senses touch pressure, the elastic layer 130 generates vibration feedback under the action of an electric field force, and deformation quantity changes of the elastic layer 130 are fed back to a finger of a user to form tactile feedback. The elastic layer 130 is made of a magnetorheological elastomer material layer, and can effectively add a magnetic field under the action of an electric field, so that the deformation rebound speed is increased, and the recovery and rebound effects of the elastic layer are increased. The deformation change of the voltage control elastic layer 130 between the conductive electrode layers 120 is changed to perform the tactile feedback, so that the limitation of the mechanical structure of the keys in the traditional keyboard on reducing the thickness is avoided, the thickness of each layer in the tactile feedback module can be further compressed, and the thickness of the keyboard is reduced.

The specific manner in which the vibration amplitude of the elastic layer 130 varies with the voltage between the adjacent two conductive electrode layers 120 is not exclusive, and in the present embodiment, the vibration amplitude of the elastic layer 130 increases with the increase in the voltage between the conductive electrode layers 120. The vibration amplitude of the elastic layer 130 can be controllably adjusted by controlling the voltage change between the conductive electrode layers 120, and the operation is simple, convenient and reliable.

The specific types and thicknesses of the thin film insulating layer 110 and the conductive electrode layer 120 are not exclusive, and in one embodiment, the thin film insulating layer 110 may be made of a PET (polyethylene terephthalate) material, and the thickness may be designed to be 50 um. The conductive electrode layer 120 may be a carbon paste layer or a silver paste layer, and the thickness of the conductive electrode layer 120 may be about 10 um. The conductive electrode layer 120 is a carbon paste layer or a silver paste layer, has high conductivity, and can be matched with the overall structure of the keyboard for shape adjustment.

In one embodiment, the elastic layer 130 is 10 microns to 100 microns thick. The thickness of the elastic layer 130 is designed to be 10-100 micrometers, so that the influence of too low thickness on the touch feedback effect is avoided, and the excessive increase of the thickness of the touch feedback module caused by too high thickness is also avoided.

Further, in one embodiment, the elastic layer 130 includes a plurality of individual columnar elastomers having a height of 30-50 microns. The height of the columnar elastic body is designed to be 30um-50um, and deformation quantity change can be guaranteed to be generated for touch feedback of fingers of a user while the thickness of the keyboard is effectively reduced according to voltage change between the conductive electrode layers 120. The single-layer thin film insulation layer 110, the single-layer conductive electrode layer 120 and the single-layer elastic layer 130 are sequentially overlapped to form a single product structure, namely a conductive film, and the multiple product structures are overlapped in a staggered mode to obtain the touch feedback module.

In one embodiment, the columnar elastomer is distributed in the elastic layer 130 with a non-uniform density. The columnar elastic bodies are distributed in the elastic layer 130 in uneven density, different areas of the elastic layer 130 feed back different vibrations to a user during vibration, and the touch feedback effect for the user is enhanced.

The specific structure of the conductive electrode layer 120 is not exclusive, and in one embodiment, the conductive electrode layer 120 includes a driving portion and an electrode portion that are electrically connected, the thin film insulation layer 110, the driving portion of the conductive electrode layer 120, and the elastic layer 130 are stacked layer by layer, and the electrode portions of the conductive electrode layer 120 with the same voltage polarity are attached to each other and respectively serve as positive and negative electrodes for inputting a driving signal of the tactile feedback module.

Specifically, the number of the electrode portions of the conductive electrode layer 120 may be one or more, for example, when the number of the electrode portions is two, the electrode portions may be designed at opposite sides of the driving portion of the conductive electrode layer 120. Specifically, as shown in fig. 2, taking the number of electrode portions of the conductive electrode layer 120 as an example, the multilayer conductive films 100 may be sequentially stacked by rotating 180 ° in a staggered manner, and then bonded to reduce the thickness after the stacking of the multilayer product structure is completed. The electrode part 140 on the same side is attached to serve as a positive electrode/negative electrode for inputting a driving signal of the tactile feedback module, and the electrode part 140 on the other side is attached to serve as a negative electrode/positive electrode for inputting a driving signal of the tactile feedback module. As shown in fig. 3, the electrode portions 140 extending from both sides of the stacked structure are used as positive and negative electrodes to which driving signals are input, respectively.

In this embodiment, the thin film insulating layer 110, the driving portion of the conductive electrode layer 120, and the elastic layer 130 are stacked, so as to prevent the product from being separated due to vibration of the product during the use vibration process of the product, thereby playing a role of a fixing structure. The electrode part 140 of the lead-out conductive electrode layer 120 is attached to obtain a positive electrode and a negative electrode for inputting a driving signal of the tactile feedback module, so that the driving signal is accessed to adjust the voltage between the conductive electrode layers 120, and the convenience of driving control of the tactile feedback module is improved.

In one embodiment, as shown in fig. 4, bonding portions corresponding to the electrode portions of the conductive electrode layer 120 may also be disposed on two opposite sides of the elastic layer 130, after the thin film insulation layer 110, the conductive electrode layer 120, and the elastic layer 130 are sequentially stacked, the electrode portions of the conductive electrode layer 120 located on the same side are bonded by the bonding portions of the elastic layer 130, so as to avoid the bonding effect being affected by an excessively large height difference between the two conductive electrode layers 120.

In addition, the lamination mode among the thin film insulation layer 110, the conductive electrode layer 120 and the elastic layer 130 is not unique, and in this embodiment, the thin film insulation layer 110, the conductive electrode layer 120 and the elastic layer 130 are laminated and bonded by using a double-sided adhesive tape or a water adhesive tape, so as to improve the fixing reliability of the haptic feedback module.

Further, in one embodiment, the elastic layer 130 simulates the shape of a finger and the force distribution applied to the conductive electrode layer 120. Specifically, the elastic layer 130 is coated on the conductive layer 120 to simulate the shape and stress distribution of the finger, and different pattern distribution modes can be adopted for the center point and the edge point of the finger, so that the defect of inconsistent vibration feedback caused by the arc structure of the finger is overcome, and the touch feedback effect of the user is enhanced.

In one embodiment, a membrane keyboard is also provided, comprising the haptic feedback module.

In one embodiment, the membrane keyboard further comprises a controller, and the controller is connected with the conductive electrode layer of the tactile feedback module.

The voltage of the drive signal delivered to the conductive electrode layer may be adjusted by a controller. For example, a user may send a voltage adjustment command to the controller to cause the controller to control the voltage of the drive signal delivered to the conductive electrode layer according to the voltage adjustment command to achieve different haptic feedback bounce forces. The user can be according to actual demand, through the voltage of controller control drive signal who carries to the conducting electrode layer, realizes different touch feedback bounce to make the user experience different touch feedback dynamics, it is more convenient to use.

In one embodiment, the membrane keypad further comprises a voltage control circuit, the voltage control circuit connecting the controller and the conductive electrode layer. The controller controls the voltage amplitude value transmitted to the conductive electrode layer by the voltage control circuit according to the voltage adjusting instruction, so that the driving voltage of the conductive electrode layer is adjusted, and the control is convenient and reliable. It is understood that in other embodiments, the controller may transmit the corresponding driving voltage to the conductive electrode layer directly according to the voltage adjustment command.

In one embodiment, the number of the haptic feedback modules is two or more, and the controller is connected to each haptic feedback module through the voltage control circuit for controlling the voltage control circuit to provide different driving voltages for each haptic feedback module. Different driving voltages are provided for different touch feedback modules in the membrane keyboard to change the maximum deformation amount of the elastic layer in each touch feedback module, so that different touch feedback resilience is realized, a user can feel different touch feedback, the user can conveniently identify different touch feedback modules, different touch feedback resilience can be realized by adjusting the driving voltages for different touch feedback modules according to the user requirements, and the user can experience inconstant touch feedback and is more convenient to use.

In one embodiment, an electronic device is also provided, which includes the membrane keyboard. The electronic device may be a notebook computer, a desktop computer, or other devices that require a keyboard to input information.

In order to better understand the haptic feedback module, the membrane keypad and the electronic device, the following structural embodiments are explained in detail.

Due to the limitation of the structure, the conventional keyboard design realizes pressing and rebounding feedback under the action force of the key cap and the elastic structure matched with the finger, and due to the material reason of the key cap, the mechanical force fed back by the key cap to the finger is the reaction force of the finger pressing the key cap, so that the keyboard is relatively stiff in practical use, the user experience feeling is general, the feeling of tactile feedback can not be fed back to the finger, and meanwhile, different tactile feedback forces can not be given to the finger according to different user environments or different specific letter keys. Moreover, conventional keyboard structure is single independent segmentation formula design of keyboard, leads to unable seamless butt joint between the button, has certain button space, can be according to live time's lapse, can be because of the clearance between button and the button, can adsorb the dust of more tiny granule in the middle of under the effect of electrostatic adsorption, influences pleasing to the eye and reduces user experience and feels. In addition, the keyboard is designed according to a conventional keyboard structure and comprises an elastic mechanism, a surface key frame and a key cap. In view of the material, the thickness of the keyboard cannot be compressed to a great extent, and the thickness of the existing keyboards is relatively high, although the thickness of the keyboard is reduced, the thickness of the existing keyboards still cannot be matched with that of the thin film due to the material.

Based on this, the film keyboard and touch feedback module thereof that this application provided overturns the design of traditional keyboard, is not using traditional key cap, rubber to kick-back and key frame isotructure, but uses the magnetic current rheology elastomer material preparation elastic layer 130 that has high dielectric constant, possess high resilience force material, and thickness can accomplish 30um-50 um. The conductive electrode layer 120 is made of materials with good conductivity, such as carbon paste and silver paste, and the conductive electrode layer is strong in conductivity and can be made into various shapes such as surface bending by matching with the whole structure of the keyboard, and the thickness of the conductive electrode layer can be about 10 um. The thin film insulating layer 110 made of non-conducting materials is used on the contact surface of the electrode and a user to play an insulating protection role, and meanwhile, the thin film insulating layer can be separated from the outside air, so that the electrode is prevented from being oxidized, and a waterproof evasion role is played. The elastic layer 130, the conductive electrode layer 120 and the thin film insulation layer 110 are laminated layer by layer, and may be laminated and bonded by using a common double-sided adhesive tape or a water-based adhesive tape. The product separation caused by the vibration of the product in the use vibration process is avoided, the fixing structure effect is achieved, and the vibration sense is enhanced. The magneto-rheological elastomer material layer is coated on the conductive layer, the shape and stress distribution of fingers can be simulated, different pattern distributions can be adopted for finger force application center points and edge points, the defect of inconsistent vibration feedback caused by the arc-shaped structure of the fingers can be overcome, and the experience and use convenience of users are enhanced.

As shown in fig. 1, a single product structure (i.e., conductive film 100) stack comprises, in order, a thin film insulating layer 110 (e.g., a PET layer), a conductive electrode layer 120 (e.g., a carbon paste, a silver paste layer), and an elastic layer 130. As shown in fig. 2, the multiple product structures are stacked in a staggered manner, and the number of stacked layers can be increased or decreased appropriately according to the user experience, for example, about 8 layers can be used. The multilayer products are sequentially and alternately rotated by 180 degrees for superposition, and the structure shown in figure 2 is formed after superposition. After a plurality of products are stacked, a finished product with reduced gap and reduced thickness is formed by adhering water adhesive or double-sided adhesive, as shown in fig. 3, electrodes extending out from two sides of the product are respectively used as positive and negative electrodes for inputting driving signals, the input testing signals generally adopt unipolar triangular wave periodic signals, the frequency generally adopts about 20-200Hz, and the frequency of a traditional keyboard, such as a mechanical keyboard, is simulated.

After the multi-layer product is stacked to form the tactile feedback module, the input signal is respectively connected to two ends of the tactile feedback module, and the electrode parts on two sides in the tactile feedback module shown in fig. 3 are respectively used as positive and negative electrodes. Input signal referring to fig. 5, the input signal divides four different control sampling points in one period: t1, T2, T3 and T4 are used to briefly describe the configuration of the haptic feedback module under different driving voltages and magnetic fields, respectively. Fig. 6 to 8 are transient diagrams of dynamic changes of the haptic feedback module under different driving signals, taking the elastic layer 130 as an example of being designed as a pillar, fig. 6 is an initial state where the haptic feedback module starts to be subjected to an electric field force, fig. 7 is an initial state where the electric field force and the magnetic field force are the largest, and the pillar-shaped elastic body 132 (specifically, the magnetorheological elastic pillar) is subjected to the largest electric field force and the magnetic force. Fig. 8 shows the original state of the pillar elastomer 132, which is gradually rebounded by the electric and magnetic field forces, and the pillar elastomer 132 is gradually rebounded by its own rebounding force and magnetic field force. The specific process is as follows:

a) the method comprises the following steps T1-T2 state. At time T1, the shape of the magnetorheological elastic column is as shown in fig. 6, and there is no deformation for a while, at time T1-T2, the electric field force gradually increases with the magnetic field force, the electrostatic adsorption force between the two conductive electrode layers 120 gradually increases, and a gradually increasing acting force is generated on the magnetorheological elastic column, at time T2, the electric field force is the largest, the magnetic field force is the largest, the direction of the resultant force is the same, the adsorption force between the two conductive electrode layers 120 is the largest, and at this time, the deformation amount of the column is the largest, as shown in fig. 7.

b) The method comprises the following steps T2-T3 state. At the time T2 to T3, the electric field force gradually decreases, the magnetic field force also gradually decreases, the absorption force between the two conductive electrode layers 120 also gradually decreases, the magnetorheological elastic pillar slowly rebounds according to its own resilience force, and when the driving signal is at the time T3, the magnetorheological elastic pillar rebounds to the maximum, as shown in the state of fig. 8.

c) The method comprises the following steps T3-T4 state. At this time, the input signal is substantially 0, and there is substantially no electric field force or magnetic field force between the two conductive electrode layers 120, so there is no electrostatic adsorption force, and the magnetorheological elastic column still maintains the original initial state.

d) The method comprises the following steps The signals in the stages T1 to T4 vary in period, and the frequency of the input signal shown in fig. 5 is about 50 Hz. Wherein the frequency of the input signal can be selected to be 20Hz-200Hz, and the signal source with different frequency can be input according to different user experiences, for example, if the user wants to experience stronger vibration, the frequency can be increased to be larger. When a user's finger contacts the tactile feedback module, the input signal changes periodically as shown in fig. 5, the magnetorheological elastic pillars change from 0 deformation to the maximum deformation, the feeling fed back to the finger is referred to as tactile feedback for short, as shown in fig. 9, a schematic diagram of the tactile feedback module contacted by the finger when the deformation of the elastic layer 130 is zero, and as shown in fig. 10, a schematic diagram of the tactile feedback module contacted by the finger when the deformation of the elastic layer 130 is maximum.

As shown in fig. 11, the structural design diagram of the membrane keyboard is shown, the bottom of each letter and symbol key 200 (e.g. letters a, B, C … …, etc.) respectively uses the finished structure after stacking the products shown in fig. 3, and each letter or key respectively pulls out the corresponding electrode and respectively inputs different driving signals. Therefore, in the use process of each key, different driving voltages can be input according to the experience requirements of users, and different tactile feedbacks are obtained.

Above-mentioned film keyboard and tactile feedback module thereof adopts elastic layer (like 30 um's magnetic current becomes elastomer material layer), conductive electrode layer (like 10 um's carbon thick liquid or silver thick liquid layer) and film insulation layer (like 50 um's PET layer), and monolithic product gross thickness can accomplish about 0.1mm, can increase to 6 layers-10 layers for reinforcing tactile feedback effect, and whole thickness can accomplish below 1mm for the product is thinner, lighter. Moreover, the design of independent segmentation of a single key in the traditional keyboard is not needed, seamless butt joint between the keys can be realized, and the key gap is reduced to reduce the possibility of adsorbing tiny particle dust. The elastic layer 130 is made of the magnetorheological elastomer, and can effectively have the effect of an additional magnetic field under the action of an electric field, so that the deformation rebound speed is increased, the effect of the electric field is enhanced additionally, and the effects of accelerating the column recovery and rebound are achieved. The outermost layer of the conductive electrode layer and the elastic layer is made of an insulating material, such as a PET (polyethylene terephthalate) material, so that the waterproof and dustproof purposes can be achieved, the service life of the product is prolonged, and the waterproof purpose is achieved.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A haptic feedback module comprising at least two stacked conductive films,

2. A haptic feedback module as recited in claim 1 wherein said elastic layer vibrates with an amplitude that increases with an increase in voltage between said conductive electrode layers.

3. A haptic feedback module according to claim 1, wherein the conductive electrode layer includes a driving portion and an electrode portion electrically connected to each other, the thin film insulating layer, the driving portion of the conductive electrode layer, and the elastic layer are stacked, and the electrode portions of the conductive electrode layers having the same voltage polarity are respectively used as positive and negative electrodes to which a driving signal of the haptic feedback module is input.

4. A haptic feedback module as recited in claim 1 wherein said elastic layer has a thickness of 10-100 microns.

5. A haptic feedback module as recited in claim 4 wherein said elastic layer comprises a plurality of individual pillar-like elastic bodies having a height of 30-50 microns.

6. A haptic feedback module as recited in claim 1 wherein said conductive electrode layer is a carbon paste layer or a silver paste layer.

7. A haptic feedback module as recited in claim 5 wherein said columnar elastomer is distributed in said elastic layer with a non-uniform density.

8. A membrane keyboard comprising a haptic feedback module according to any one of claims 1-7.

9. The membrane keyboard of claim 8, further comprising a controller connected to the conductive electrode layer of the haptic feedback module.

10. An electronic device comprising the membrane keypad of claim 8 or 9.