CN205984725U - Key device - Google Patents

Abstract

The utility model discloses a key device, it includes sensor and switch, the sensor can be with the pressure conduction that receives extremely when pressing the switch makes the switch is triggered. Key device still includes soft and hard combined plate, soft and hard combined plate including the first hardboard that is located the top, be located the second hardboard of below and press from both sides in first hardboard with softness circuit board between the second hardboard, sensor settings is in on the first hardboard, switching system is in on the second hardboard. The utility model discloses an among the key device, can realize through the switch that mechanical button function in order to avoid the mistake to touch, can realize touch panel nimble relatively through the sensor, possess touch and two kinds of control function of mechanical button simultaneously, and with switch and sensor integration on soft and hard combined plate, simplified the structure.

Description

Key device

Technical field

This utility model is related to button technical field, more particularly, to a kind of key device.

Background technology

Existing terminal, such as mobile phone, the commonly used mechanical key as navigation key, volume key etc..With technology development, Touch key-press occurs, that is, user only needs to touch ad-hoc location and can realize some operations.But touch key-press often goes out The situation of existing false touch, mechanical key does not enable the relatively flexible function of touch-control again, the two each own certain defect.

Utility model content

The technical problems to be solved in the utility model is, provides a kind of improved key device.

This utility model solves its technical problem and be employed technical scheme comprise that：There is provided a kind of key device, it includes passing Sensor and switch, can be by the pressure conduction being subject to described switch so that described switch be triggered when described sensor is pressed. Described key device also includes Rigid Flex, and described Rigid Flex includes the first hardboard above, underlying Second hardboard and be sandwiched in flexible circuit board between described first hardboard and described second hardboard, described sensor is arranged on described On first hardboard, described switch is arranged on described second hardboard.

Preferably, described sensor includes at least one of：Fingerprint sensor, touch sensing, blood oxygen transducer and Heart rate sensor.

Preferably, described switch is fixed on described second hardboard, described second hardboard includes be electrically connected with contact portion, works as institute When stating key device and being pressed, described switch is contacted thus being triggered and producing a switching signal with the described contact portion that is electrically connected with.

Preferably, described switch as metal dome, described metal dome is fixed on described second hardboard by colloid or solder.

Preferably, described switch as touch-switch, it include metal clips, peripheral contacts, central contact, the first pin and Second pin, the section of described metal clips is domed, and the edge of described metal clips is contacted with described peripheral contacts, described Metal clips is used for deforming upon when pressed and contact with described central contact, described peripheral contacts and described first pin Electrical connection, described central contact is electrically connected with described second pin, and described second hardboard also includes corresponding described first pin First binding portion, the second binding portion of corresponding described second pin, described first pin is fixed on by conductive rubber or solder In described first binding portion, described second pin is fixed in described second binding portion by conductive rubber or solder.

Preferably, described sensor is cased with a becket.

Preferably, described flexible circuit board includes main part and the extension being connected with described main part, described main part It is sandwiched between described first hardboard and described second hardboard, described extension is used for electrically connecting other outer members or circuit, institute State the device area that extension includes being provided with electronic component, described device area is additionally provided with the benefit for supporting electronic component Strong plate.

Preferably, described stiffening plate is fixed on described device area by colloid, and described electronic component and described reinforcement Plate is located at the both sides of the device area of described extension respectively.

Preferably, the quantity of described stiffening plate is two and the respectively first stiffening plate and the second stiffening plate, wherein first Stiffening plate is arranged at the extension end of described flexible circuit board, and the wherein second stiffening plate is arranged between described extension two ends Region.

Preferably, described first stiffening plate is electrically connected with a chase by conducting resinl and fixes, thus described first reinforcement Electrical ground realized by plate.

Preferably, described key device also includes cover plate, and described cover plate is arranged on described sensor to protect described biography Sensor.

Preferably, described cover plate includes substrate and is arranged at the dyed layer between described substrate and described sensor.

Preferably, described sensor surface is coated with ink layer.

Implementing the beneficial effects of the utility model is：In key device of the present utility model, machinery be can achieve by switch Keypress function, to avoid false touch, can realize relatively flexible touch control by sensor, be provided simultaneously with touch and machinery by Two kinds of control functions of key；And will switch with sensor integration on Rigid Flex, simplify structure.

Brief description

Below in conjunction with drawings and Examples, the utility model is described in further detail, in accompanying drawing：

The front plan schematic diagram of the key device that Fig. 1 provides for this utility model first embodiment；

Fig. 2 is the back side plane schematic diagram of key device shown in Fig. 1；

Fig. 3 is the decomposition view of key device shown in Fig. 1；

Fig. 4 is sectional view at the A-A of key device shown in Fig. 1；

The decomposition view of the switch that Fig. 5 provides for this utility model；

Fig. 6 is the top view of the pedestal of switch shown in Fig. 5；

Fig. 7 is the sectional view of switch shown in Fig. 5；

Rigid Flex, sensor and the sectional view switching that Fig. 8 provides for this utility model second embodiment；

Rigid Flex, sensor and the sectional view switching that Fig. 9 provides for this utility model the 3rd embodiment；

The key device principle schematic that Figure 10 provides for this utility model；

Figure 11 is the principle schematic of processor in Figure 10；

The Fundamentals of Sensors schematic diagram that Figure 12 is supplied to for this utility model；

The touch-control sensing module board front schematic view that Figure 13 provides for this utility model；

The touch-control sensing module board reverse side schematic diagram that Figure 14 provides for this utility model；

The schematic diagram of the touch-control sensing module that Figure 15 provides for this utility model.

Main element symbol description

Key device	200
		Touch control component	10
Sensor	12
		Touch-control sensing module	122
Driver element	12A
		Sensing unit	12B
Analytic unit	12C
		Touch-control judge module	124
Becket	14
		Switch	20
Metal clips	21
		Peripheral contacts	22
Central contact	23
		First pin	24
Second pin	25
		Pedestal	26
Host cavity	261
		Button	27
Lid	28
		Through hole	282
Pad	292
		Sealing member	294
Rigid Flex	30
		First hardboard	32
Second hardboard	34
		It is electrically connected with contact portion	342
First binding portion	344
		Second binding portion	346
Flexible circuit board	36
		Main part	362
Extension	364
		Device area	365
Ground area	366
		Stiffening plate	37
Chase	38
		Processor	40
First output module	41
		Second output module	42
Select control module	43
		Cover plate	50
Substrate	52
		Dyed layer	54

Following specific embodiment will further illustrate this utility model in conjunction with above-mentioned accompanying drawing.

Specific embodiment

Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is carried out Clearly and completely description is it is clear that described embodiment is only a part of embodiment of this utility model rather than whole Embodiment.Based on the embodiment in this utility model, those of ordinary skill in the art are not under the premise of making creative work The every other embodiment being obtained, broadly falls into the scope of this utility model protection.

It should be noted that when an assembly is considered as " connection " another assembly, it can be directly to separately One assembly or may be simultaneously present assembly placed in the middle.When assembly be considered as " located at " another assembly, it can be It is set directly on another assembly or may be simultaneously present assembly placed in the middle.Term as used herein " top ", " upper table Face ", " lower surface ", " lower section ", " peripheral ", " " center " and similar statement are for illustrative purposes only.

Unless otherwise defined, all of technology used herein and scientific terminology are led with belonging to technology of the present utility model The implication that the technical staff in domain is generally understood that is identical.In term used in the description of the present utility model it is simply herein The purpose of description specific embodiment is it is not intended that in limiting this utility model.

Refer to Fig. 1 to Fig. 4, the key device 200 that this utility model first embodiment provides, described key device 200 are installed on a kind of terminal（Not shown）In.Described terminal can set for mobile phone, panel computer, PDA or other electric terminals Standby.Described terminal can adopt but be not limited to adopt Android system.

Described key device 200 includes touch control component 10, switch 20 and Rigid Flex 30.Described touch control component 10 with And the both sides that described switch 20 is arranged at described Rigid Flex 30.

Described Rigid Flex 30 includes the first hardboard 32, flexible circuit board 36 and the second hardboard 34 being stacked. Wherein, described first hardboard 32 is above, and described second hardboard 34 is located at lower section, and described flexible circuit board 36 is sandwiched in described the Between one hardboard 32 and described second hardboard 34.Described first hardboard 32, flexible circuit board 36 and the second hardboard 34 pass through heat The mode of pressing is combined into one.Described second hardboard 34 is provided with and is electrically connected with contact portion 342 and the first binding portion 344 and second Binding portion 346.

Described flexible circuit board 36 includes main part 362 and the extension 364 being connected with described main part 362.Described master Body 362 is sandwiched between described first hardboard 32 and described second hardboard 34.Described extension 364 is used for electrically connecting outside other Element or circuit（Not shown）.Described extension 364 includes the device area 365 being provided with electronic component, and with described device The spaced ground area 366 in part region 365.Described ground area 366 is used for realizing electrical ground.

Described device area 365 is additionally provided with the stiffening plate 37 for supporting electronic component.Described stiffening plate 37 passes through glue Body（Not shown）It is fixed on described device area 365, and described electronic component is located at described extension respectively with described stiffening plate 37 The both sides of the device area 365 in portion 364.Described stiffening plate 37 is steel disc.Specifically in the shown embodiment（Fig. 1 and Fig. 2）, institute The quantity stating stiffening plate 37 is two and the respectively first stiffening plate and the second stiffening plate, and the wherein first stiffening plate is arranged at described Extension 364 end of flexible circuit board 36, the wherein second stiffening plate is arranged at the region between described extension 364 two ends.

One chase 38 passes through conducting resinl（Not shown）Electrically connect and fix with described first stiffening plate, and with described access area Domain 366 electrically connects, so that described first stiffening plate realizes electrical ground.Wherein, described chase 38 is fixed on described access area Domain 366.

Described touch control component 10 includes sensor 12 and becket 14.Described becket 14 is sheathed on described sensor 12 On.Described sensor 12 is welded on the upper surface of described first hardboard 32 thus being electrically connected with described first hardboard 32 by solder Connect, and described sensor 12 is fingerprint sensor or touch sensing.Can be by pressing of being subject to when described sensor 12 is pressed Power is conducted and is switched 20 so that described switch is triggered to described.It is understood that described sensor 12 can directly be pressed, Can indirectly be pressed.Described sensor 12 can be fingerprint sensor, touch sensing, blood oxygen transducer or heart rate sensor.

The lower surface of described becket 14 is fitted closely with the upper surface of described first hardboard 32.Described becket 14 is Big width is more than or equal to the Breadth Maximum of described first hardboard 32, the Breadth Maximum of described becket 14 also greater than or be equal to institute State the Breadth Maximum of the second hardboard 34., in order to improve structural strength and sealing waterproof, described becket 14 is also for described becket 14 Can be used for information gathering, the processor of terminal will be transferred to the biological information of the object of metallic rings contact.For avoiding Becket 14 produces the static interference to sensor 12, need to electrically connect becket 14 with sensor 12.

Described switch 20 is fixed on the lower surface of described second hardboard 34.The pressing that described switch 20 is used for user inputs, When user's pressing（Directly pressing or indirect pressing）During key device 200, described touch control component 10 is under the effect of user's pressing force Move near described switch 20 direction, described switch 20 is contacted thus being triggered and producing one with the described contact portion 342 that is electrically connected with Switching signal.Can achieve that mechanical press-key apparatus switching function avoids false touch by switching 20.Alternatively, switch 20 can be Metal dome, described metal dome is fixed on described second hardboard 34 by colloid or solder.Switch 20 is preferably film key dress Put, in other embodiments, switch 20 can also be other mechanical opens such as SMD touch-switch or conductive rubber switch Close key device.

See also Fig. 5 to Fig. 7, described switch 20 is touch-switch.Described switch includes metal clips 21, periphery is touched Point 22, central contact 23, the first pin 24, second pin 25, pedestal 26, button 27, lid 28, pad 292 are with sealing member 294.

The generally U-shaped pedestal of described pedestal 26, recessed in its one end is formed with host cavity 261.Described peripheral contacts 22 fill On the inwall of described pedestal 26.Described central contact 23 is arranged at the approximate mid-section position of the diapire of described host cavity 261, Wherein said peripheral contacts 22 are arranged around described central contact 23.Described first pin 24 and described second pin 25 are arranged On the lateral wall of described pedestal 26, wherein said peripheral contacts 22 are electrically connected with described first pin 24, described central contact 23 are electrically connected with described second pin 25.Described first pin 24 is fixed on described first binding portion by conductive rubber or solder On 344, described second pin 25 is fixed in described second binding portion 346 by conductive rubber or solder.

The section of described metal clips 21 is domed, and the recessed formation downwards of the approximate mid-section position of described metal clips 21 One salient point（Not shown）.Described metal clips 21 is contained in described host cavity 261, and its edge and described peripheral contacts 22 phase Contact.Described metal clips 21 is used for deforming upon when pressed and contacting with described central contact 23, and then turns on described First pin 24 and described second pin 25.

Described lid 28 covers described host cavity 261, and offers the through hole being connected with described host cavity 261 thereon 282.Described button 27 is partially housed in described host cavity 261, and part stretches out in described lid 28 via described through hole 282 Outward.Described pad 292 is sheathed on described button 27 periphery, so that described button 27 is relatively fixed with described lid 28 being connected.Institute State sealing member 294 to be located between described button 27 and described metal clips 21.

The key device 200 of this utility model embodiment also includes a cover plate 50.Described cover plate 50 is arranged at described biography To protect described sensor 12 on sensor 12.Described cover plate 50 includes substrate 52 and is arranged at described substrate 52 and described sensor Dyed layer 54 between 12.Described dyed layer 54 is used for decorating and protect described sensor 12.Described dyed layer 54 can be silk Print layer.Described substrate 52 can be glass plate.

It is understood that in other embodiments, directly described coloring can be set in the surface of described sensor 12 Layer 54, for example, directly form ink layer in described sensor 12 surface spraying, to realize decorating the function of described sensor 12.

Refer to Fig. 8, the key device that this utility model second embodiment provides is filled with the button of first embodiment Put roughly the same, its difference is：The Rigid Flex of the key device in second embodiment omits in first embodiment The second hardboard, described sensor 12 is arranged at the upper surface of the first hardboard 32, described switch 20 is arranged at described soft electricity On road plate 36.Wherein, described flexible circuit board 36 is provided with and is electrically connected with contact portion 342, when described key device 200 is pressed, Described switch 20 is contacted thus being triggered and producing a switching signal with the described contact portion 342 that is electrically connected with.

Refer to Fig. 9, the key device that this utility model the 3rd embodiment provides is filled with the button of first embodiment Put roughly the same, its difference is：The Rigid Flex of the key device in the 3rd embodiment omits in first embodiment The first hardboard, described sensor 12 is arranged at the upper surface of described flexible circuit board 36, described switch 20 is arranged at described The lower surface of the second hardboard 34.Wherein, described second hardboard 34 is provided with and is electrically connected with contact portion 342, when described key device 200 quilt During pressing, described switch 20 is contacted thus being triggered and producing a switching signal with the described contact portion 342 that is electrically connected with.

In some embodiments of this utility model, from the angle of operation principle, as shown in Figure 10, key device 200 Also include processor 40, processor 40 realizes corresponding function with switch 20, sensor 12 cooperation.Wherein, sensor 12 is used for root Export touching signals according to touch, switch 20 is used for according to push action output one pressing signal, processor 40 and sensing Device 12 and switch 20 communication connect, and export and touching signals or the pressing corresponding control instruction of signal.In certain embodiments, The control method of key device includes step S1 to S3.S1：Processor 40 judges whether produce a pressing signal on switch 20, if It is then to execute S3, if it is not, then execution step S2；S2：Processor 40 judges whether sensor 12 produces touching signals, if so, Then export the first control instruction, if it is not, then not exporting；S3：Export the second control instruction.Preferably, control instruction includes first Control instruction and the second control instruction.

Wherein, in conjunction with shown in Figure 11, processor 40 includes the first output module 41, the second output module 42 and selects to control Module 43.It is to be appreciated that the device that processor 40 can be separately provided for key device 200, or or belong to originally in Terminal but with key device 200 share part.

First output module 41 is used for exporting the first control instruction according to touching signals.Alternatively, the first output module 41 are additionally operable to search in register data storehouse whether there is corresponding valid data according to touching signals, and are finding relatively The first control instruction is exported during the valid data answered.Described valid data comprise the fingerprint prestoring.Preferably, the first output Module 41 reads the data of related register in control chip by iic bus.

Second output module 42 is used for according to pressing signal output second control instruction.Alternatively, the first control instruction And/or second control instruction be ESC Escape instruction, return key instruction, dormancy awakening instruction, at least one in exit instruction.Excellent Selection of land, the first control instruction and the second control instruction are respectively the instruction of HOME key or the instruction of BACK key.For example, the first control refers to Make and instructing for return key, described second control instruction is exit instruction.

Control module 43 is selected to be connected with the first output module 41 and the second output module 42, for according to pressing signal choosing Select the first output module 41 and export the first control instruction or the second output module 42 output the second control instruction.Preferably, switch 20 when not having any pressing or press pressure is less than pressing force threshold, and the voltage that processor 40 detects switch 20 is High level（Magnitude of voltage is equal to VDD/AVDD）；Finger corresponding to when pressing signal or other objects are pressed into switch 20 When pressure is up to or over pressing force threshold, the voltage that processor 40 detects switch 20 is low level（With GND short circuit State）.It is to be appreciated that pressing force threshold is 1.6-3.5N.Preferably, pressing force threshold is 2.4N.When processor 40 detects To the voltage of switch 20 be high level when, now processor 40 thinks that switch 20 is not pressed, and can detect simultaneously The signal of sensor 12.When the voltage that processor 40 detects switch 20 is low level, now biography ignored by processor 40 The signal of sensor 12, thinks that switch 20 is in the state being pressed simultaneously.

Preferably, the method that may also include false-touch prevention in some embodiments.Before step S1, may also include following step Suddenly：Processor 40 judges whether switch 20 produces a touch sensible signal according to external touch action, and if so, then explanation pressing is believed Number generation be based on the sent instruction of user on the basis of, thus step S1 can be continued executing with.If it is not, then illustrating not to use The sent instruction in family, but because false touch leads to other objects press the generation of signal, in this case, be immediately finished Subsequent operation.Such benefit is just to carry out further pressing the judgement of signal only after user sends instruction, if by mistake Touch other objects in the case of, then directly exit current operation interface, can prevent user because false touch switch 20 and experience lf being influenced.

In some preferred embodiments, control method also comprises the steps T1 to T3.T1：Control module 43 is selected to judge A pressing signal whether is produced, if so, then execution step T3 on switch 20；If it is not, then execution step T2.T2：Select to control mould Block 43 selects the first output module 41 to export the first control instruction.T3：Control module 43 is selected to select the second output module 42 defeated Go out the second control instruction.

In conjunction with shown in Figure 12, sensor 12 includes touch-control sensing module 122 and touch-control judge module 124.Touch-control sensing mould Block 122 is used for sensing touch and exporting induced signal.In conjunction with shown in Figure 13 to Figure 15, touch-control sensing module 122 includes driving Moving cell 12A, sensing unit 12B and analytic unit 12C, wherein, forming one between driver element 12A and sensing unit 12B can The variable capacitance amount being changed according to the change of touch, analytic unit 12C is according to variable capacitance amount output sensing letter Number.Preferably, predetermined threshold value is predetermined capacitive threshold value, and described predetermined threshold value can be adjusted according to actually used needs.Institute State touch-control sensing module 122 to be made up of two sides, front is driver element 12A and sensing unit 12B, the two is mutually embedded and hands over Wrong setting, reverse side be GND cover copper.Preferably, driver element 12A and sensing unit 12B is comb shaped structure, the comb of the two The interlaced embedded setting in position, and can exchange.Alternatively, front is driver element 12A and sensing unit 12B also may be used For other structures, as long as staggered embedded arrange can be realized.Wherein becket 14 can meet GND, to improve electrostatic screen Performance.When no any material is contacted with sensor 12, between driver element 12A and sensing unit 12B electrode, one can be formed Electric capacity.When the pressure touching or being pressed against keytop gently is less than a pressure threshold with finger or other conductive materials When value, the electric capacity between driver element 12A and sensing unit 12B can be caused to change.It is to be appreciated that pressure threshold For 1.6-3.5N.Preferably, pressure threshold is 2.4N.The size of pressure threshold can be according to switch 1（Switch 1 can select pot Young piece switch）Model determine, different closing pressure threshold value is different, can carry out type selecting according to actual needs.When above-mentioned electricity When appearance change reaches and exceedes capacitance variation amount set in advance, analytic unit 12C can produce an interrupting information, and exports Induced signal, induced signal includes interrupting information.

Touch-control judge module 124 is used for judging whether induced signal reaches a predetermined threshold value, and exports touch-control when reaching Signal.It is to be appreciated that the first output module 41 is connected with touch-control judge module 124, and according to receiving touching signals output the One control instruction.

Preferably, in certain embodiments, also comprise the steps P1 to P3 in above-mentioned steps S2.P1：Touch-control sensing mould Block 122 sensing touch simultaneously exports induced signal, and induced signal includes interrupting information.Alternatively, the first output module 41 Judge whether to have corresponding valid data in register data storehouse always according to touching signals, if so, then output first control refers to Order, if it is not, then do not export.P2：Touch-control judge module 124 judges whether induced signal reaches a predetermined threshold value, if so, then executes Step P3；If it is not, then terminating.P3：First output module 41 exports the first control instruction.

In this utility model embodiment, touch control component 10 is integrated on Rigid Flex 30 with switch 20, and simplification finishes Structure.Flexible circuit board 36 can touch control component 10 press and the moving process upspring in occur certain deformation not affect to electrically connect Circuit, convenient use, increase the service life.Using switch 20 and touch control component 10 so that key device 200 is provided simultaneously with machinery Button and touch controllable function, the touch of user and push can provide two kinds of different signals of telecommunication, realize on one component Realize various control function.When user's pressing keys device 200, touch sensible signal and switch 20 can be triggered simultaneously, from And realize realizing on one component various control function, save structure space.Two controls that sensor 12 is produced with switch 20 Signal processed may be respectively used for controlling difference in functionality it is also possible to control identical function simultaneously, such as when two control signals are same When produce when just start a certain function, such that it is able to be prevented effectively from false touch.

Further, this utility model also provides a kind of key device of change embodiment and terminal, and described change is real The scheme applying mode is essentially identical with above-mentioned embodiment, and that is, the basic explanation of above-mentioned embodiment is for described change in fact Apply mode, the scheme of described change embodiment differs primarily in that, described touch control component is changed to above-mentioned embodiment Other sensors assembly（As fingerprint sensing device assembly）, described sensor cluster be additionally operable to when by touch or pressing obtain apply The biological information of the object touching or pressing.Described biological information can be finger print information.

Specifically, described terminal is additionally operable to will obtain after the biological information obtaining the object applying to touch or press Biological information compare with default biological information, if comparison result be identical, execute the 3rd control function.

Described terminal includes processor, and described processor detects whether described terminal is in using biological information solution The state at lock/checking interface, if so, described processor control described sensor cluster obtain apply to touch or pressing object Biological information, and control the biological information of acquisition is compared with default biological information, if comparison result is identical, Then output control instruction executes described 3rd control function, if comparison result is different, described processor judges whether produce on switch A raw pressing signal, if so, then output control instructs to execute described second control function, if it is not, then described processor judges Whether sensor cluster produces touching signals, and if so, then output control instructs to execute described first control function, if it is not, Then do not export.

Described being in includes unlocked by fingerprint state, confidential data using the state that biological information unlocked/verified interface Process at least one in fingerprint authentication state and fingerprint authentication pay status.

Described 3rd control function is unlocking screen, open data, backup data, deletion data, in payment function At least one.

Described sensor cluster is used for when being pressed can be by the pressure conduction being subject to described switch so that described switch quilt Trigger and realize the 4th control function, described 4th control function is to wake up sleep mode.

Described touch as clicking touch, that is, described sensor cluster produced when clicking touch control signal realize described Second control function.

Embodiment of above only in order to the technical solution of the utility model to be described and unrestricted, although with reference to preferably real above Mode of applying has been described in detail to this utility model, it will be understood by those within the art that, can be new to this practicality The technical scheme of type is modified or equivalent should not depart from the spirit and scope of technical solutions of the utility model.

Claims (13)

1. a kind of key device, it includes sensor and switch, can by the pressure conduction being subject to extremely when described sensor is pressed Described switch described switch is triggered it is characterised in that：Described key device also includes Rigid Flex, described soft or hard knot Plywood includes the first hardboard above, underlying second hardboard and is sandwiched in described first hardboard and described second hardboard Between flexible circuit board, described sensor is arranged on described first hardboard, and described switch is arranged on described second hardboard.

2. key device as claimed in claim 1 it is characterised in that：Described sensor includes at least one of：

Fingerprint sensor, touch sensing, blood oxygen transducer and heart rate sensor.

3. key device as claimed in claim 1 it is characterised in that：Described switch is fixed on described second hardboard, described Include on second hardboard being electrically connected with contact portion, when described key device is pressed, described switch is contacted with the described contact portion that is electrically connected with Thus being triggered and producing a switching signal.

4. key device as claimed in claim 3 it is characterised in that：Described switch as metal dome, described metal dome passes through glue Body or solder are fixed on described second hardboard.

5. key device as claimed in claim 1 it is characterised in that：Described switch as touch-switch, it include metal clips, Peripheral contacts, central contact, the first pin and second pin, the section of described metal clips is domed, and described metal clips Edge contact with described peripheral contacts, described metal clips be used for deform upon when pressed and connect with described central contact Touch, described peripheral contacts are electrically connected with described first pin, and described central contact is electrically connected with described second pin, described second Hardboard also includes the first binding portion of corresponding described first pin, corresponds to the second binding portion of described second pin, and described first Pin is fixed in described first binding portion by conductive rubber or solder, and described second pin passes through conductive rubber or solder is solid It is scheduled in described second binding portion.

6. key device as claimed in claim 1 it is characterised in that：One becket is cased with described sensor.

7. key device as claimed in claim 1 it is characterised in that：Described flexible circuit board include main part and with described master The extension that body connects, described main part is sandwiched between described first hardboard and described second hardboard, and described extension is used for Electrically connect other outer members or circuit, described extension includes the device area being provided with electronic component, described device area It is additionally provided with the stiffening plate for supporting electronic component.

8. key device as claimed in claim 7 it is characterised in that：Described stiffening plate is fixed on described device region by colloid Domain, and described electronic component is located at the both sides of the device area of described extension respectively with described stiffening plate.

9. key device as claimed in claim 7 it is characterised in that：The quantity of described stiffening plate is two and respectively first Stiffening plate and the second stiffening plate, the wherein first stiffening plate is arranged at the extension end of described flexible circuit board, the wherein second benefit Strong plate is arranged at the region between described extension two ends.

10. key device as claimed in claim 9 it is characterised in that：Described first stiffening plate passes through conducting resinl and a chase Electrically connect and fix, thus described first stiffening plate realizes electrical ground.

11. key devices as claimed in claim 1 it is characterised in that：Described key device also includes cover plate, and described cover plate sets It is placed on described sensor to protect described sensor.

12. key devices as claimed in claim 11 it is characterised in that：Described cover plate includes substrate and is arranged at described substrate Dyed layer and described sensor between.

13. key devices as claimed in claim 1 it is characterised in that：Described sensor surface is coated with ink layer.