CN209766291U - Thin film keyboard and keys thereof - Google Patents

Abstract

The disclosure relates to a key of a film keyboard, which comprises a keycap, a shell, an elastic telescopic piece and a pressing device; the clamping device comprises a shell, a clamping unit and a clamping unit, wherein the shell comprises an accommodating unit and at least one clamping unit; the accommodating unit is of a hollow structure; the clamping unit is positioned on the outer side wall of the accommodating unit; a pressing device including a mounting unit and a striking unit; one end of the mounting unit penetrates through one end part of the accommodating unit and is fixedly connected with the keycap, and the other end of the mounting unit is positioned in the accommodating unit; a striking unit having one end connected to the other end of the mounting unit and the other end for penetrating the other end of the receiving unit to contact an external circuit device of the membrane keyboard; and the elastic expansion piece is positioned in the accommodating unit and is abutted between the mounting unit and the other end part of the accommodating unit. This technical scheme can easily define percussion stroke length, dynamics, percussion pressure gram number curve etc. customizes and changes according to the user's demand, satisfies user's user demand. The present disclosure also relates to a membrane keypad.

Description

Thin film keyboard and keys thereof

Technical Field

The disclosure relates to the technical field of keyboards, in particular to keys of a film keyboard and the film keyboard.

background

The traditional keyboards are divided into membrane keyboards and mechanical keyboards, which are widely used in various industries and are important key products for information communication. The keyboard basically generates signals through finger actions, transmits the signals into a host after the signals are processed by the keyboard, and then carries out interaction. After the keyboard is developed for 30 years, under the condition that the popularity of the keyboard is higher and higher along with the higher and higher living quality of the people, the requirement of a consumer on the hand feeling of the keyboard is higher and higher, the requirement on the keyboard with good hand feeling is higher and higher from the original basic requirement capable of being input to the current requirement on inputting comfort, but the price of the keyboard is still limited to a certain extent, and the good hand feeling keyboard product with too high price cannot be accepted by the consumer.

the Membrane keyboard mainly comprises a keycap, an upper cover, a silica gel bowl (Rubber), a flexible circuit (Membrane) and a support lower cover structure at the lowest part. The percussion mode adopts silica gel bowl (Rubber) as dynamics and percussion curve, and flexible circuit (Membrane) is as hitting the circuit, and in the process that the keycap forces silica gel bowl (Rubber) to deform, silica gel bowl (Rubber) and flexible circuit bump, produce the percussion. The main sources of hand feeling are friction between the keycap and the upper cover, deformation of the silica gel bowl (Rubber), and impact of the silica gel bowl (Rubber) on the flexible circuit (Membrane).

The mechanical keyboard mainly comprises a keycap, a shaft, an upper cover, a PCB and a lowermost supporting lower cover structure. The percussion principle is that the shaft body generates a signal to the PCB after generating motion. The user presses the key cap and produces the axis body deformation, and the axis body produces and switches on signal transmission and gives PCB and keyboard main part. The source of feeling mainly provides for the deformation friction of axis body self and inside spring.

SUMMERY OF THE UTILITY MODEL

The embodiment of the disclosure provides a key of a film keyboard and the film keyboard, which can easily define a trigger stroke length, force, a trigger pressure gram curve and the like, and can be customized and replaced according to user requirements, so that the use requirements of users are met. The technical scheme is as follows:

According to a first aspect of the embodiments of the present disclosure, a key of a membrane keyboard is provided, which includes a keycap, a housing, an elastic expansion piece, and a pressing device;

The shell comprises an accommodating unit and at least one clamping unit;

The accommodating unit is of a hollow structure;

The clamping unit is positioned on the outer side wall of the accommodating unit and is used for detachably connecting the accommodating unit with an external device;

The pressing device moves relative to the accommodating unit under the action of external force to penetrate through the accommodating unit and comprises a mounting unit and a striking unit;

the mounting unit is in sliding contact with the accommodating unit, one end of the mounting unit penetrates through one end of the accommodating unit and is fixedly connected with the keycap, and the other end of the mounting unit is positioned in the accommodating unit;

The other end of the striking unit penetrates through the other end opposite to one end of the accommodating unit to contact with a circuit device of an external membrane keyboard;

the elastic expansion piece is positioned in the containing unit and is abutted between the mounting unit and the other end of the containing unit.

the technical scheme provided by the embodiment of the disclosure can have the following beneficial effects: according to the technical scheme, the keycaps are pressed through external force, the mounting units move axially relative to the containing units, and then the mounting units apply force to the elastic extensible members, so that after the elastic extensible members deform, the striking units can be in contact collision with the circuit devices of the thin-film keyboard outside the shell, and electric signals input by the keys are generated. After the external force is cancelled, the elastic expansion piece has the tendency of recovering the original state under the action of the elastic force, and the striking unit is reset and separated from the circuit device. The deformation of the elastic expansion piece provides elasticity for the installation unit and the striking unit, and the elasticity of the elastic expansion piece can be realized by changing the shape or the radial size of the elastic expansion piece, so that the elastic expansion piece with the required elasticity can be adopted as required. According to the elastic telescopic piece, the required trigger stroke length, force, trigger pressure gram curve and the like can be formed when the key is pressed, and a specific hand feeling is formed. Simultaneously, because the unit that holds can dismantle with external device through the joint unit and be connected, so can change holding the unit, be convenient for change the unit that holds of the elastic expansion piece of installing different elasticity size to realize changing the button of different feels, and change and maintain.

In one embodiment, the mounting unit includes a pressing member and two limiting members;

The pressing piece is in sliding contact with the accommodating unit, one end of the pressing piece penetrates through one end of the accommodating unit and is fixedly connected with the keycap, and the other end of the pressing piece is positioned in the accommodating unit;

the two limiting parts are respectively fixed on the two opposite side walls of the pressing part;

Two opposite inner walls of the accommodating unit are respectively provided with a limiting groove;

The long shaft of the limiting groove extends along the moving direction of the pressing piece and is used for accommodating the limiting piece, so that the pressing piece is limited on the accommodating unit when moving;

And the two telescopic ends of the elastic telescopic piece are respectively abutted between the other end of the pressing piece and the other end of the accommodating unit.

The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects: this technical scheme passes through the pressing member and is spacing on holding the unit through the locating part in the motion process. The limiting part slides in the limiting groove without departing from the limiting groove in the process of pressing part movement, so that the pressing part can move relative to the containing unit, and the striking unit is driven to move. The locating part is in holding the inside cooperation structure that forms of unit, simple structure and saving space.

in one embodiment, the number of the clamping units comprises two;

the two clamping units are respectively connected to two opposite outer side walls of the accommodating unit;

The clamping unit comprises a first clamping part and a second clamping part which are protruded towards the surface of the outer side wall far away from the accommodating unit;

The first clamping portion and the second clamping portion are staggered, and the first clamping portion and the second clamping portion are clamped with the external device.

the technical scheme provided by the embodiment of the disclosure can have the following beneficial effects: this technical scheme is through first joint portion and second joint portion and external device joint to the realization holds dismantling of unit and external device and is connected, so hold the unit and can change with press device, be convenient for change the button of different feels, and change and maintain. Meanwhile, the structure of the clamping unit is convenient for a user to detach and operate, and the operation is simple and convenient.

in one embodiment, one of the second clamping parts comprises: the clamping device comprises an accommodating groove, a connecting piece and a clamping piece;

the accommodating groove is positioned on the outer side wall of the accommodating unit where the second clamping part is positioned;

One end of the connecting piece is fixedly connected with the side wall of the accommodating groove, and the other end of the connecting piece extends towards the opposite side;

The clamping piece is fixedly connected with the connecting piece and protrudes towards the surface of the outer side wall far away from the accommodating unit.

The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects: this technical scheme forms cantilever structure through the connecting piece in the holding tank, and when joint spare received external force, external force transmitted to the connecting piece through joint spare, made the other end of connecting piece have certain motion space in the holding tank, formed elasticity joint structure, and further convenient to detach holds the unit with the installation.

In one embodiment, the other second clamping portion is fixedly connected with the outer side wall of the accommodating unit where the second clamping portion is located.

the technical scheme provided by the embodiment of the disclosure can have the following beneficial effects: this technical scheme forms elasticity joint structure through one of them second joint portion, and another second joint portion forms fixed joint structure, and two second joint portions can make hold difficult rocking under the pressing force effect after unit and external device are connected, have promoted the stability and the feeling of pressing the in-process.

In one embodiment, the pressing piece is provided with a containing cavity;

The accommodating cavity is provided with a limiting through hole at the position close to the elastic telescopic piece;

The striking unit comprises a mandrel, a limiting part and a limiting spring;

the mandrel is in clearance fit with the limiting through hole, one end of the mandrel penetrates into the accommodating cavity through the limiting through hole, and the other end of the mandrel is used for penetrating through the other end opposite to one end of the accommodating unit so as to contact with a circuit device of an external thin-film keyboard;

the limiting part is fixedly connected with one end of the mandrel, is positioned in the accommodating cavity and is used for limiting one end of the mandrel in the accommodating cavity;

the limiting spring is abutted between the accommodating cavity and one end of the mandrel, so that the striking unit moves relative to the mounting unit.

The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects: this technical scheme exerts the elastic force effect through spacing spring to the dabber, and after the dabber motion contacted with the circuit arrangement of outside film keyboard, if when receiving circuit arrangement's reaction force when great, the dabber can produce and certainly present and contract under spacing spring's effect, consequently, can avoid the dabber to puncture the circuit and lead to damaging circuit arrangement, not only plays the guard action to circuit arrangement, has still prolonged life.

In one embodiment, the mandrel has a receiving cavity extending in an axial direction;

the accommodating cavity is communicated with one end close to the accommodating cavity;

The axial direction of the limiting spring is overlapped with the axial direction of the mandrel and abuts against and is held between the containing cavity and the inside of the containing cavity.

The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects: this technical scheme holds in holding the chamber through spacing spring, and is more stable when not only making spacing spring concertina movement, practices thrift installation space moreover, compact structure.

In one embodiment, the housing unit,

comprises an upper shell, a lower shell detachably connected with the upper shell, at least two elastic claws and at least two clamping parts;

the elastic clamping claw is fixedly connected with the bottom edge of the upper shell and extends from the bottom edge of the upper shell to the lower shell;

the clamping part is positioned on the outer side wall of the lower shell, protrudes towards the surface of the outer side wall far away from the lower shell and is clamped with the elastic clamping claw;

The upper shell is detachably connected with the lower shell through elastic clamping claws and clamping parts;

The pressing piece is arranged on the upper shell in a penetrating mode;

the limiting groove is positioned on the inner wall of the upper shell;

And the clamping unit is positioned on the outer side wall of the lower shell.

The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects: this technical scheme can dismantle the connection through epitheca and inferior valve, can change and hold the inside elastic expansion piece of unit, changes the elastic expansion piece of different elasticity size to satisfy the different requirements of feeling of user.

In one embodiment, the housing further comprises a light guide hole and a light scattering part;

The light guide hole is positioned on one side part of the other end part of the accommodating unit and is used for guiding a light source of an external device into the accommodating unit;

The light scattering part is positioned on one end part of the accommodating unit, is opposite to the light guide hole, is provided with an arc surface back to the light guide hole, and is made of transparent materials.

The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects: this technical scheme passes through in leaded light hole and astigmatism portion with the leading-in holding unit of external light source, has promoted the visual effect who uses.

According to a second aspect of embodiments of the present disclosure, there is provided a membrane keyboard comprising: a bearing unit, a circuit device and a plurality of keys according to any one of the above schemes;

The upper surface of the bearing unit is provided with a plurality of key mounting holes;

The circuit device is a thin film circuit board, is positioned in the bearing unit and is provided with a plurality of signal triggering parts;

The accommodating unit is detachably connected with the key mounting hole through the clamping unit;

the striking unit penetrates through the other end part opposite to one end part of the accommodating unit to contact the signal triggering part.

the technical scheme provided by the embodiment of the disclosure can have the following beneficial effects: according to the technical scheme, the keycaps are pressed through external force, the mounting unit moves axially relative to the containing unit, and then the mounting unit applies force to the elastic extensible member, so that after the elastic extensible member deforms, the striking unit can be in contact collision with a circuit device of the thin-film keyboard outside the shell, and an electric signal input by a key is generated. After the external force is cancelled, the elastic expansion piece has the tendency of recovering the original state under the action of the elastic force, and the striking unit is reset and separated from the circuit device. The deformation of the elastic expansion piece provides elasticity for the installation unit and the striking unit, and the elasticity of the elastic expansion piece can be realized by changing the shape or the radial size of the elastic expansion piece, so that the elastic expansion piece with the required elasticity can be adopted as required. According to the elastic telescopic piece, the required trigger stroke length, force, trigger pressure gram curve and the like can be formed when the key is pressed, and a specific hand feeling is formed. Meanwhile, the accommodating unit is detachably connected with the external device through the clamping unit, so that the accommodating unit and the pressing device can be replaced, keys with different handfeel can be conveniently replaced, and replacement and maintenance can be carried out.

The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects:

According to the technical scheme, the keycaps are pressed through external force, the mounting unit moves axially relative to the containing unit, and then the mounting unit applies force to the elastic extensible member, so that after the elastic extensible member deforms, the striking unit can be in contact collision with a circuit device of the thin-film keyboard outside the shell, and an electric signal input by a key is generated. After the external force is cancelled, the elastic expansion piece has the tendency of recovering the original state under the action of the elastic force, and the striking unit is reset and separated from the circuit device. The deformation of the elastic expansion piece provides elasticity for the installation unit and the striking unit, and the elasticity of the elastic expansion piece can be realized by changing the shape or the radial size of the elastic expansion piece, so that the elastic expansion piece with the required elasticity can be adopted as required. According to the elastic telescopic piece, the required trigger stroke length, force, trigger pressure gram curve and the like can be formed when the key is pressed, and a specific hand feeling is formed. Meanwhile, the accommodating unit is detachably connected with the external device through the clamping unit, so that the accommodating unit and the pressing device can be replaced, keys with different handfeel can be conveniently replaced, and replacement and maintenance can be carried out.

it is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.

Fig. 1 is a schematic diagram illustrating a key structure of a membrane keyboard according to an exemplary embodiment.

Fig. 2 is a sectional view of a key structure a-a of a membrane keypad according to an exemplary embodiment.

Fig. 3 is a cross-sectional view of a key structure B-B of a membrane keypad according to an exemplary embodiment.

Fig. 4 is a schematic diagram illustrating a pressing device structure according to an exemplary embodiment.

Fig. 5 is a sectional view of a key structure of a membrane keypad according to an exemplary embodiment.

FIG. 6 is a block diagram illustrating a clamping unit according to an exemplary embodiment.

FIG. 7 is a block diagram illustrating a clamping unit according to an exemplary embodiment.

FIG. 8 is a schematic diagram illustrating a striking unit structure according to an exemplary embodiment.

FIG. 9 is a schematic diagram illustrating a striking unit structure according to an exemplary embodiment.

Fig. 10 is a schematic diagram illustrating a pressing device structure according to an exemplary embodiment.

Fig. 11 is a schematic diagram illustrating a key structure of a membrane keyboard according to an exemplary embodiment.

fig. 12 is a schematic diagram illustrating a key structure of a membrane keyboard according to an exemplary embodiment.

FIG. 13 is a schematic diagram illustrating a housing structure according to an exemplary embodiment.

fig. 14 is a cross-sectional view of a key structure C-C of a membrane keypad according to an exemplary embodiment.

FIG. 15 illustrates a cross-sectional view of a key structure B-B of a membrane keypad, according to one exemplary embodiment.

FIG. 16 is a cross-sectional view of a membrane keypad shown in accordance with an exemplary embodiment.

FIG. 17 is a cross-sectional view of a membrane keypad shown in accordance with an exemplary embodiment.

Detailed Description

reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

In the related technology, the membrane keyboard is the most popular keyboard in the market at present, but the hand feeling of the keys is not good enough, and because the deformation degree of the silica gel bowl depends on the material of the silica gel bowl, the deformation degree is difficult to control, and the specific hand feeling curve is difficult to make, the functions of adjusting the percussion pressure curve, the force and the like are difficult to adjust. Although the product is cheap, the hand feeling is not good enough. Meanwhile, the user can not be customized and replaced according to the user requirements, and the use requirements of the user can not be met.

fig. 1 is a schematic diagram illustrating a key structure of a membrane keyboard according to an exemplary embodiment, and as shown in fig. 1, a key of a membrane keyboard includes a key cap 10, a housing 20, an elastic expansion member 30, and a pressing device 40.

the housing 20 includes a receiving unit 21 and at least one clamping unit 22.

The accommodating unit 21 has a hollow structure.

The clamping unit 22 is located on an outer side wall of the accommodating unit 21, and is used for detachably connecting the accommodating unit 21 with an external device.

The pressing device 40, which moves relative to the accommodating unit 21 by an external force to penetrate through the accommodating unit 21, includes a mounting unit 41 and a striking unit 42.

The mounting unit 41 is in sliding contact with the accommodating unit 21, one end of which penetrates through one end 211 of the accommodating unit 21 and is fixedly connected with the key cap 10, and the other end of which is located in the accommodating unit 21.

One end of the striking unit 42 is connected to the other end of the mounting unit 41, and the other end of the striking unit 42 penetrates through the other end 212 of the accommodating unit 21 opposite to the one end 211 to contact with the circuit device 52 of the external membrane keyboard.

the elastic expansion piece 30 is located in the accommodating unit 21 and is abutted between the mounting unit 41 and the other end 212 of the accommodating unit 21.

In this embodiment, the accommodating unit 21 is a hollow structure, the pressing device 40 is mounted on the accommodating unit 21 and can move relative to the accommodating unit 21 under an external force, for example, after a user presses the key cap 10, the mounting unit 41 moves axially (vertically up and down as shown in fig. 1) relative to the accommodating unit 21, and then the mounting unit 41 applies a force to the elastic expansion member 30, so that after the elastic expansion member 30 is deformed, the striking unit 42 can collide with the external circuit device 52 of the membrane keyboard to generate an electrical signal for key input. After the external force is removed, the elastic expansion piece 30 has a tendency to restore its original shape under the action of the elastic force, and the striking unit 42 is reset and separated from the circuit device 52. The pressing device 40 includes a mounting unit 41 and a striking unit 42, and the mounting unit 41 and the striking unit 42 are movable relative to the accommodating unit 21 when the key cap 10 is pressed. The mounting unit 41 is inserted through one end 211 of the accommodating unit 21 (as shown in fig. 1, the top of the accommodating unit 21) and is in sliding contact with the one end 211 of the accommodating unit 21. One end (the upper end as shown in fig. 1) of the mounting unit 41 is located outside the accommodating unit 21, the other end (the lower end as shown in fig. 1) is located inside the hollow structure of the accommodating unit 21, the mounting unit 41 is limited on the accommodating unit 21 during the movement process and cannot be separated from the accommodating unit 21, and the key cap 10 is fixedly connected with one end of the mounting unit 41. The connection mode between the key cap 10 and the mounting unit 41 includes clamping or bonding. The two retractable ends of the elastic expansion piece 30 respectively abut against the other end (the lower end as shown in fig. 1) of the mounting unit 41 and the other end 212 (the bottom as shown in fig. 1) of the accommodating unit 21. One end (upper end as shown in fig. 1) of the striking unit 42 is connected to the other end (lower end as shown in fig. 1) of the mounting unit 41, and the other end (lower end as shown in fig. 1) of the striking unit 42 can penetrate through the other end 212 (bottom as shown in fig. 1) of the accommodating unit 21 to extend out of the accommodating unit 21 to contact with the circuit device 52 under the driving of the movement of the mounting unit 41. The deformation of the elastic extensible member 30 provides elastic force to the mounting unit 41 and the striking unit 42, and the elastic force of the elastic extensible member 30 can be achieved by changing the shape or radial size of the elastic extensible member 30, so that the elastic extensible member 30 having the required elastic force can be used as needed. According to the elastic expansion piece 30, the required percussion stroke length, force and percussion pressure gram curve can be formed when the key is pressed, and a specific hand feeling is formed. The other end 212 of the accommodating unit 21, i.e. the bottom as shown in fig. 1, includes an inner bottom surface and an outer bottom surface, and the elastic expansion piece 30 abuts against the inner bottom surface of the accommodating unit 21.

Meanwhile, in the present embodiment, the clamping unit 22 is detachably connected to an external device, so that the accommodating unit 21 is detachably connected to the external device. Because the accommodating unit 21 is detachably connected with an external device through the clamping unit 22, the accommodating unit 21 can be replaced, so that keys with different hand feelings can be replaced conveniently, and replacement and maintenance can be performed. The number of clamping units 22 may comprise one or more, for example two, three or four. The clamping unit 22 can be clamped with an external device (for example, a key mounting hole on a membrane keyboard), and when the clamping unit 22 needs to be detached, the clamping unit 22 can be elastically deformed by external force, and then the accommodating unit 21 is detached.

In one embodiment, the housing 20 is made of a light-conductive transparent PC (polycarbonate) material, hard PVC (hard polyvinyl chloride), ABS (acrylonitrile butadiene styrene copolymer), or POM (polyoxymethylene) material. The mounting unit 41 is made of a wear-resistant material such as a PC (polycarbonate) material, an ABS (acrylonitrile butadiene styrene) copolymer, or POM (polyoxymethylene), and the striking unit 42 is made of a wear-resistant material such as POM (polyoxymethylene).

in one embodiment, the elastic extension 30 includes, but is not limited to, a spring or leaf spring. The elastic sheet has a cantilever structure extending from the middle to two sides, the two cantilevers respectively abut against the installation unit 41 and the accommodation unit 21, and the two cantilevers can be respectively and fixedly connected with the installation unit 41 and the accommodation unit 21. When an external force is applied to the mounting unit 41, the two cantilevers of the spring plate are compressed by the force, and the middle portion of the spring plate is elastically deformed to generate an elastic force. In this embodiment, as shown in fig. 1, the elastic expansion member 30 is a spring, and two ends of the spring, which can expand and contract, can be respectively and fixedly connected with the mounting unit 41 and the other end 212 of the accommodating unit 21, or the spring can be sleeved on the striking unit 42 to form two ends of the spring, which can expand and contract, to abut against between the bottom of the mounting unit 41 and the bottom of the accommodating unit 21.

In one embodiment, striking unit 42 may have a columnar structure, including a cylinder, a prism, or a square column. The striking unit 42 may be fixedly connected to the mounting unit 41 without relative movement, or may be movably connected to the mounting unit 41 through a connecting member 224, and may move relative to the mounting unit 41 when external force is applied.

In one embodiment, as shown in fig. 2, the housing 20 further includes a first through hole 23 and a second through hole 24.

The first through hole 23 is located at the top (one end 211) of the accommodating unit 21.

the mounting unit 41 penetrates the top of the accommodating unit 21 through the first through hole 23.

The second through hole 24 is located at the bottom (the other end 212) of the accommodating unit 21 opposite to the first through hole 23, and a guide portion 25 is provided on the second through hole 24.

the guiding portion 25 is a tubular structure, is located in the accommodating unit 21, and is coaxial and fixedly connected with the second through hole 24.

The striking unit 42 has the other end located in the guide portion 25 to move in the axial direction of the guide portion 25.

When the elastic extensible member 30 is a spring, the spring is sleeved on the striking unit 42 and the guide portion 25.

in this embodiment, the guide portion 25 extends in the axial direction of the second through hole 24 toward the first through hole 23 and is formed in a tubular structure, the inner diameter of the guide portion 25 is equal to the inner diameter of the second through hole 24, and the lower end of the striking unit 42 is located in the guide portion 25, so that when the striking unit 42 moves in the axial direction of the guide portion 25 (up-and-down movement as shown in fig. 2), the striking unit 42 is in clearance fit with the guide portion 25, and the guide portion 25 can limit the moving direction of the striking unit 42, so that the striking unit 42 is kept in the axial direction of the guide portion 25 or the longitudinal axis direction of the striking unit 42 as much as possible during movement, and thus the striking unit 42 moves more stably, and has better hand feeling. In this embodiment, when elastic expansion piece 30 is the spring, the spring housing is established hit beat unit 42 with on the guide part 25, hit unit 42 and guide part 25 and all be located the spiral hollow structure that the spring formed promptly, can make the central axis of spring in concertina movement process spring not take place the skew as far as possible, kept concertina movement's stability as far as possible, and is further, not only makes the motion of installation element 41 more stable, still avoids the spring to damage, has prolonged the life of button, and has saved installation space. In the present embodiment, the tubular shape of the guide portion 25 matches the shape of the portion of the striking unit 42 located inside the guide portion 25, wherein the guide portion 25 may be a circular tube, and the striking unit 42 may have a cylindrical structure.

in one embodiment, as shown in fig. 3, 4 and 5, the mounting unit 41 includes a pressing member 411 and two limiting members 412.

the pressing member 411 is in sliding contact with the accommodating unit 21, has one end penetrating through one end 211 of the accommodating unit 21 and fixedly connected to the key cap 10, and has the other end located in the accommodating unit 21.

The two stoppers 412 are respectively fixed on two opposite sidewalls of the pressing member 411.

The accommodating unit 21 has a limiting groove 213 on two opposite inner walls.

The long axis of the limiting groove 213 extends along the moving direction of the pressing member 411, and is used for accommodating the limiting member 412, so that the pressing member 411 is limited on the accommodating unit 21 when moving.

The two ends of the elastic extensible member 30 are respectively abutted between the other end of the pressing member 411 and the other end 212 of the accommodating unit 21.

In this embodiment, the pressing member 411 penetrates through one end portion 211 of the accommodating unit 21 (shown as the top of the accommodating unit 21 in fig. 3), one end (the upper end in fig. 3) of the pressing member 411 is located outside the accommodating unit 21, the other end (the lower end in fig. 3) is located in the hollow structure of the accommodating unit 21, the mounting unit 41 is limited on the accommodating unit 21 during the movement process and cannot be separated from the accommodating unit 21, and the key cap 10 is fixedly connected with one end of the mounting unit 41. The limiting groove 213 is located on the inner sidewall of the accommodating unit 21 and has a groove structure, and the limiting member 412 is located in the limiting groove 213. When the pressing member 411 moves relative to the accommodating unit 21, the limiting member 412 slides in the limiting groove 213, and when the pressing member 411 does not move, the limiting member 412 abuts against a side wall of the limiting groove 213, which is perpendicular to the moving direction of the pressing member 411. The limiting member 412 and the limiting groove 213 enable the pressing member 411 to move without separating from the accommodating unit 21, the limiting member 412 can slide in the limiting groove 213, and the limiting groove 213 plays a role in guiding and limiting the movement of the limiting member 412. Meanwhile, two limiting members 412 and two limiting grooves 213 are oppositely arranged to balance the stress of the pressing member 411. The limiting member 412 is engaged with the limiting groove 213 inside the accommodating unit 21, so that the structure is simple and the space is saved.

In this embodiment, the two retractable ends of the elastic extensible member 30 respectively abut against the lower end (the other end) of the pressing member 411 and the bottom (the other end 212) of the accommodating unit 21.

in one embodiment, the pressing piece 411 penetrates through one end portion 211 (top portion) of the accommodation unit 21 through the first through hole 23.

In one embodiment, as shown in fig. 2 and 6, the number of the clamping units 22 includes two.

The two clamping units 22 are respectively connected to two opposite outer side walls of the accommodating unit 21.

the clamping unit 22 includes a first clamping portion 221 and a second clamping portion 222 protruding toward the surface of the outer side wall away from the accommodating unit 21.

The first clamping portion 221 and the second clamping portion 222 are staggered with each other, and the external device is clamped between the first clamping portion 221 and the second clamping portion 222.

In this embodiment, two clamping units 22 are disposed opposite to each other, and after the clamping units 22 are clamped with an external device, the accommodating unit 21 can be balanced in stress. The first and second clamping portions 221 and 222 each have an outwardly protruding structure. When holding unit 21 is in the joint with external device, that is, with the button mounting hole joint, for example, second joint portion 222 is close to another tip 212 of holding unit 21, another tip 212 of holding unit 21 enters the button mounting hole first, then presses and holds unit 21, second joint portion 222 is through the button mounting hole after being extruded and deformed by the button mounting hole, at this moment, the periphery card of button mounting hole is between second joint portion 222 and first joint portion 221, the fall size that forms between first joint portion 221 and the second joint portion 222 equals the thickness of button mounting hole. During the dismantlement, by the extrusion of button back to two second joint portions 222 simultaneously, second joint portion 222 warp the back, continues to exert thrust to holding unit 21, will hold unit 21 and push out the button mounting hole can. In this embodiment, the first clamping portion 221 and the second clamping portion 222 are clamped with the external device to realize detachable connection between the accommodating unit 21 and the external device, so that the accommodating unit 21 can be replaced, that is, the whole key can be replaced, thereby facilitating replacement of keys with different handfeel and replacement and maintenance. Meanwhile, the clamping unit 22 can elastically deform to a certain extent, and the structure of the clamping unit 22 is convenient for a user to detach and operate, so that the operation is simple and convenient.

In one embodiment, the second catching portion 222 may have a slope gradually approaching from an outer end thereof to an outer side wall of the accommodating unit 21, the slope being opposite to a wall of the hole where the second catching portion 222 contacts the key mounting hole to facilitate sliding movement on the key mounting hole when the accommodating unit 21 is mounted and dismounted.

In one embodiment, each of the two clamping units 22 includes a second clamping portion 222, and the two second clamping portions 222 may have the same or different structures.

In one embodiment, as shown in fig. 7, one of the second clamping portions 222 includes: receiving grooves 223, connecting members 224, and snap members 225.

The receiving groove 223 is located on an outer sidewall of the receiving unit 21 where the second clamping portion 222 is located.

One end of the connecting member 224 is fixedly connected to the sidewall of the receiving groove 223, and the other end extends toward the opposite side.

The clamping member 225 is fixedly connected to the connecting member 224 and protrudes to the surface of the outer side wall away from the accommodating unit 21.

In this embodiment, one second clamping portion 222 of the two second clamping portions 222 forms the above-mentioned elastic clamping structure. Specifically, holding tank 223 has been seted up on holding the lateral wall of unit 21, the one end of connecting piece 224 and the lateral wall fixed connection of holding tank 223, the other end of connecting piece 224 to the opposite face direction relative with the one end of connecting piece 224 extend and with holding tank 223 lateral wall between have certain distance, the position that connecting piece 224 and holding tank 223 do not connect all have certain distance with holding tank 223's lateral wall between. Joint spare 225 is protruding to the lateral wall that holds unit 21 far away from holding tank 223 place, so, connecting piece 224 forms cantilever structure in holding tank 223, and joint spare 225 receives external force, and external force transmits to connecting piece 224 through joint spare 225, makes the other end of connecting piece 224 have certain motion space in holding tank 223, forms elasticity joint structure, and further convenient to detach holds unit 21 with the installation. Therefore, a user can conveniently replace different accommodating units 21, and the elastic force of the elastic expansion piece 30 in different accommodating units 21 is different, so as to form keys with different hand feelings. In this embodiment, the accommodating groove 223 includes a rectangular through hole, a square through hole, or a polygonal through hole. Specifically, as shown in fig. 7, in this embodiment, the receiving groove 223 has three side walls, an upper end of the receiving groove 223 is open, one end of the connecting member 224 is fixedly connected to the lower side wall of the receiving groove 223, so as to facilitate detachment of the receiving unit 21 from the external device, the other end of the connecting member 224 extends upward, and a certain distance is provided between the connecting member 224 and the receiving groove 223 and the side wall of the receiving groove 223. The joint piece 225 is protruding to the lateral wall that holds the unit 21 far away from holding tank 223 place, and the joint piece 225 is whole or partly to be located the notch outside of holding tank 223, and connecting piece 224 forms cantilever structure in holding tank 223.

In one embodiment, one of the two second clamping portions 222 forms the above-mentioned elastic clamping structure, and the other second clamping portion 222 may have the same or different structure as the second clamping portion 222.

In one embodiment, another of the second clamping portions 222 is fixedly connected to an outer side wall of the accommodating unit 21 where the other of the second clamping portions is located.

In this embodiment, as shown in fig. 2, 6, and 7, one second clamping portion 222 of the two second clamping portions 222 is the above-mentioned elastic clamping structure, and the other second clamping portion 222 is fixedly connected to the outer sidewall of the accommodating unit 21 where the other second clamping portion 222 is located. Another second joint portion 222 is to keeping away from its place the lateral wall surface arch of holding unit 21 forms fixed joint structure, and two second joint portion 222 structures are different, can make holding unit 21 be connected the back with external device and be difficult for rocking under the pressing force effect, have promoted the stability and the feeling of pressing the in-process.

in one embodiment, as shown in fig. 3 and 5, the pressing member 411 has a receiving cavity 413.

the accommodating cavity 413 is provided with a limiting through hole 414 at a position close to the elastic expansion piece 30.

The striking unit 42 includes a core shaft 421, a limiting portion 422, and a limiting spring 423.

The core shaft 421 is in clearance fit with the limiting through hole 414, one end of the core shaft penetrates into the accommodating cavity 413 through the limiting through hole 414, and the other end of the core shaft is used for penetrating through the other end 212 opposite to the one end 211 of the accommodating unit 21 to contact with the circuit device 52 of the external membrane keyboard.

the limiting portion 422 is fixedly connected to one end of the core shaft 421, is located in the accommodating cavity 413, and is used for limiting one end of the core shaft 421 in the accommodating cavity 413.

The limiting spring 423 is abutted between the accommodating cavity 413 and one end of the core shaft 421, so that the striking unit 42 moves relative to the mounting unit 41.

In this embodiment, the pressing member 411 is provided with an accommodating cavity 413, the accommodating cavity 413 is provided with a limiting through hole 414, and the accommodating cavity 413 is communicated with the inside of the accommodating unit 21 through the limiting through hole 414. One end (the upper end shown in fig. 3) of the mandrel 421 penetrates into the accommodating cavity 413 through the limiting through hole 414, and the limiting portion 422 limits one end of the mandrel 421 in the accommodating cavity 413, so that the mandrel 421 does not separate from the accommodating cavity 413. The other end (lower end as shown in fig. 3) of the spindle 421 can penetrate through the other end 212 opposite to the one end 211 of the receiving unit 21 to contact with the external circuit device 52 of the film keyboard, the spindle 421 can move axially (up and down as shown in fig. 3) along the spindle 421 relative to the receiving unit 21, and the spindle 421 can also move axially (up and down as shown in fig. 3) along the spindle 421 relative to the mounting unit 41. The telescopic both ends of spacing spring 423 support and hold between dabber 421 and the holding chamber 413 top, when dabber 421 motion and the circuit arrangement 52 contact of outside film keyboard, if receive circuit arrangement 52's reaction force when great, dabber 421 can produce certain feed and contract under spacing spring 423's effect, consequently, can avoid dabber 421 to break down the circuit and lead to damaging circuit arrangement 52, not only play the guard action to circuit arrangement 52, still prolonged life.

In one embodiment, the structure of the position-limiting portion 422 includes extending along the axial direction of the mandrel 421 to the outside of the mandrel 421, so that the sum of the transverse axis of the position-limiting portion 422 and the minimum diameter of the mandrel 421 is larger than the diameter of the position-limiting through hole 414, and the mandrel 421 will not be separated from the receiving cavity 413. In this embodiment, as shown in fig. 8, the structure of the position-limiting portion 422 may include, but is not limited to, a cylindrical or disc-shaped structure coaxial with the mandrel 421, and the position-limiting portion 422 is convenient to process, so as to save cost; alternatively, as shown in fig. 9, the limiting portion 422 includes at least two limiting sub-portions, the structure of the limiting sub-portions includes a block shape, and the two limiting sub-portions are symmetrically fixed at two ends of the diameter of the mandrel 421.

in one embodiment, as shown in fig. 10, the two retractable ends of the spacing spring 423 may be fixedly connected or in contact with the top of the accommodating cavity 413 and the spindle 421, respectively, and the number of the spacing springs 423 includes one or more. In this embodiment, when the number of the limiting springs 423 includes a plurality of springs, the springs may be uniformly arranged on the limiting portion 422, so that the force applied to the spindle 421 is uniform.

in one embodiment, as shown in fig. 11, the pressing element 411 includes a key cap mounting portion 415 and a mandrel mounting portion 416, and the key cap mounting portion 415 is fixedly connected to the mandrel mounting portion 416, wherein the fixing manner includes, but is not limited to, a threaded connection, an interference fit or an adhesive connection through a connecting unit, and the like. The key cap mounting portion 415 is located at an end of the spindle mounting portion 416 away from the spindle 421, that is, at an upper end of the spindle mounting portion 416, and the accommodating cavity 413 is located on the spindle mounting portion 416. When the pressing piece 411 and the mandrel 421 are assembled, the mandrel 421 is first inserted through the limiting through hole 414, the limiting spring 423 is then placed, and finally the keycap mounting portion 415 is fixed to the mandrel mounting portion 416.

In one embodiment, as shown in fig. 3, 5 and 11, the mandrel 421 has a receiving cavity 424 extending in the axial direction.

the accommodating cavity 424 is communicated with the accommodating cavity 413 at one end close to the accommodating cavity 413.

The limiting spring 423 axially coincides with the axial direction of the mandrel 421, and abuts between the inside of the accommodating cavity 413 and the inside of the accommodating cavity 424.

In this embodiment, the core shaft 421 has an accommodating cavity 424 extending along the axial direction, the accommodating cavity 424 extends inward along the axial direction of the core shaft 421 from one end (as shown in fig. 3 as the upper end) of the core shaft 421, the top opening of the accommodating cavity 424 is communicated with the accommodating cavity 413, and the limiting spring 423 is located in the accommodating cavity 424 and abuts between the accommodating cavity 424 and the top of the accommodating cavity 413. Spacing spring 423 holds in holding chamber 424, not only makes spacing spring 423 more stable when concertina movement, is difficult for taking place the unstability, practices thrift installation space moreover, compact structure. Meanwhile, the limiting spring 423 can have larger expansion amplitude and stroke, so that the feeding contraction is easier to occur, the damage to the circuit device 52 caused by the fact that the mandrel 421 breaks through the circuit is further avoided, the contact with the circuit device 52 can be kept when the feeding contraction occurs, and the excitation of an electric signal is not influenced.

In one embodiment, as shown in fig. 12, 13 and 14, the receiving unit 21 includes an upper shell 214, a lower shell 215, at least two elastic claws 216 and at least two catching parts 217.

The elastic latch 216 is fixedly connected to the bottom edge of the upper housing 214, and extends from the bottom edge of the upper housing 214 to the lower housing 215.

the engaging portion 217 is located on the outer sidewall of the lower housing 215, protrudes to the surface far away from the outer sidewall of the lower housing 215, and engages with the elastic claw 216.

the upper case 214 is detachably coupled to the lower case 215 by elastic claws 216 and catching portions 217.

the pressing member 411 is inserted into the upper case 214. The limiting groove 213 is located on the inner wall of the upper shell 214. The clamping unit 22 is located on the outer side wall of the lower shell 215.

In this embodiment, after the upper shell 214 and the lower shell 215 are connected, the inner part forms a hollow structure, and the upper shell 214 and the lower shell 215 are detachably connected, so that the elastic expansion piece 30 inside can be replaced, and the elastic expansion pieces 30 with different elastic forces can be replaced, so as to meet different hand feeling requirements of users. As shown in fig. 13, the elastic latch 216 includes a latch arm 2161 and a latch portion 2162, the latch arm 2161 has one end fixedly connected to the bottom edge of the upper housing 214 and the other end fixedly connected to the latch portion 2162, and the latch portion 2162 protrudes toward the outer side wall of the lower housing 215. In this embodiment, the resilient latch 216 may be an integrally formed structure. The engaging portion 217 protrudes away from the outer side wall of the lower case 215, and engages with the elastic claw 216, that is, the claw portion 2162. The first through hole 23 is located at the top of the upper case 214, and the pressing piece 411 is inserted into the upper case 214 through the first through hole 23. The second through-hole 24 is located at the bottom of the lower case 215.

in one embodiment, the number of the engaging portions 217 includes two, which are respectively located on two opposite outer sidewalls of the lower case 215 and located on different outer sidewalls from the clamping unit 22, and the number of the elastic claws 216 includes two, which are respectively matched with the engaging portions 217. The clamping parts 217 and the elastic claws 216 are symmetrically arranged, and the stress is balanced after the upper shell 214 and the lower shell 215 are clamped and connected, so that the connection is reliable. The number of the clamping portions 217 may further include four, two of the four clamping portions are a group, two groups of the two clamping portions are respectively located on the opposite outer side walls of the lower shell 215 and located on different outer side walls with the clamping unit 22, and the number of the elastic clamping claws 216 correspondingly includes four clamping portions 217.

in one embodiment, as shown in fig. 13 and 15, the side wall of the lower housing 215 adjacent to the clamping unit 22 is provided with a guide insertion part 2151 extending toward the upper housing 214.

The guide inserting part 2151 is provided with a clamping groove 2152 extending along the longitudinal axis of the guide inserting part, and the guide inserting part 2151 is inserted into the limiting groove 213.

the card slot 2152 is opened at one end close to the upper shell 214.

the limiting member 412 is located in the clamping groove 2152 and is in sliding contact with the clamping groove 2152.

In this embodiment, the limiting groove 213 is opened at an end close to the lower shell 215, and the guiding inserting part 2151 is inserted into the limiting groove 213 from the opening, so that the connection between the upper shell 214 and the lower shell 215 is more stable, and the relative movement between the upper shell 214 and the lower shell 215 is avoided. The limiting part 412 is in sliding contact with the clamping groove 2152 of the guide inserting-connecting part 2151, the limiting part 412 can move in the clamping groove 2152 along the long axis of the clamping groove 2152, the limiting part has a guiding effect on the movement of the pressing part 411, the pressing part 411 can move more smoothly, and the hand feeling during pressing can be further improved.

in one embodiment, as shown in fig. 15, when assembling the key, the pressing piece 411 and the striking unit 42 are assembled as in the above embodiment, then the assembled pressing piece 411 and striking unit 42 are inserted into the first through hole 23 from below the upper shell 214, then the striking unit 42 penetrates into the spring and guide portion 25, and finally the lower shell 215 is engaged with the upper shell 214.

In one embodiment, as shown in fig. 12, the housing 20 further includes a light guide hole 218 and a light scattering portion 219.

the light guide hole 218 is located on a side portion of the other end portion 212 of the accommodating unit 21, and guides a light source of an external device into the accommodating unit 21.

the light-diffusing part 219 is located at one end 211 of the accommodating unit 21, is opposite to the light guide hole 218, has an arc surface protruding away from the light guide hole 218, and is made of a transparent material.

In this embodiment, the light guide hole 218 is located at a side portion of the other end 212 of the accommodating unit 21, that is, at a side portion of the bottom of the accommodating unit 21, the light guide hole 218 is a through hole, the light scattering portion 219 is opposite to the light guide hole 218, and the light scattering portion 219 is located above the light guide hole 218. When the film keyboard is provided with the light source, the light source can be located below the light guide hole 218, light of the light source enters the accommodating unit 21 through the light guide hole 218 and then is diffused to the outside of the accommodating unit 21 through the light diffusion part 219, and thus, the lower part of the keycap 10 can emit bright light, so that illumination can be provided, and the visual effect can be improved. In this embodiment, the light scattering portion 219 has a convex arc surface, and can uniformly disperse the light of the light source to the periphery of the key cap 10, and avoid dazzling the emitted light.

in one embodiment, as shown in FIG. 12, the light guide holes 218 are located on the bottom of the lower shell 215 and the light diffusers 219 are located on the top of the upper shell 214.

In one embodiment, the light scattering portion 219 may extend into the light guide hole 218 toward a side of the light guide hole 218 to form an extension portion 2191, one end of the extension portion 2191 close to the light guide hole 218 is communicated with the light guide hole 218, and the light source enters from the extension portion 2191 to further photopolymerize and then diffuse the light source.

in one embodiment, the accommodating unit 21 and the light scattering portion 219 are both made of a transparent plastic material such as a light-conductive transparent PC (polycarbonate). Further, transparent plastic materials such as light-conductive transparent PC (polycarbonate) are used for the upper case 214 and the light-scattering portion 219.

According to a second aspect of the embodiments of the present disclosure, as shown in fig. 16 and 17, there is provided a membrane keyboard including: a carrier unit 50, a circuit device 52 and a plurality of keys as described in any of the above embodiments.

the upper surface of the carrying unit 50 is provided with a plurality of key mounting holes 51.

The circuit device 52 is a thin film circuit board, is located inside the bearing unit 50, and has a plurality of signal triggering portions.

The accommodating unit 21 is detachably connected with the key mounting hole 51 through the clamping unit 22.

the striking unit 42 is configured to penetrate through the other end 212 of the accommodating unit 21 opposite to the one end 211 to contact the signal trigger.

in this embodiment, the carrying unit 50 includes a face cover 53 and a rear cover 54, and the face plate and the rear cover 54 are detachably attached. The face cover 53 is provided with a plurality of key mounting holes 51, and the key accommodating unit 21 is detachably connected with the key mounting holes 51 through the clamping unit 22. Because the containing unit 21 is detachably connected with the external device through the clamping unit 22, the containing unit 21 can be replaced, the containing unit 21 provided with the elastic extensible members 30 with different elastic forces can be replaced conveniently, and the keys with different hand feelings can be replaced and maintained. When the user presses the key top 10 with his or her finger, the mounting unit 41 is moved axially (up and down as shown in fig. 16) with respect to the longitudinal axis of the housing unit 21, and the mounting unit 41 applies a force to the elastic extensible member 30 to deform the elastic extensible member 30, the striking unit 42 can contact and collide with the signal trigger portion of the circuit device 52, and an electrical signal for key input is generated. After the external force is removed, the elastic expansion piece 30 tends to restore its original shape under the action of the elastic force, and the striking unit 42 is reset and separated from the signal triggering part. The circuit device 52 is electrically connected to the controller of the membrane keypad.

In this embodiment, when the key top 10 is pressed by an external force to cause the mounting unit 41 to move axially relative to the housing unit 21, and further the mounting unit 41 applies a force to the elastic extensible member 30 to deform the elastic extensible member 30, the striking unit 42 can contact and collide with the circuit device 52 of the membrane keyboard outside the housing 20 to generate an electrical signal for key input. After the external force is removed, the elastic expansion piece 30 has a tendency to restore its original shape under the action of the elastic force, and the striking unit 42 is reset and separated from the circuit device 52. The deformation of the elastic extensible member 30 provides elastic force to the mounting unit 41 and the striking unit 42, and the elastic force of the elastic extensible member 30 can be achieved by changing the shape or radial size of the elastic extensible member 30, so that the elastic extensible member 30 having the required elastic force can be used as needed. According to the elastic expansion piece 30, the required percussion stroke length, force and percussion pressure gram curve can be formed when the key is pressed, and a specific hand feeling is formed. Meanwhile, since the accommodating unit 21 is detachably connected with an external device through the clamping unit 22, the accommodating unit 21 and the pressing device 40 can be replaced, thereby facilitating replacement of keys with different hand feelings and replacement and maintenance.

In one embodiment, as shown in fig. 16, the membrane keypad further includes a light emitting circuit board 55.

The light emitting circuit board 55 is located above the circuit device 52, a fourth through hole 56 is formed at a position corresponding to the signal trigger part, and a light source is electrically connected to a position corresponding to the light guide hole 218. And the fourth through hole 56 is in clearance fit with the striking unit 42.

In this embodiment, the light emitting circuit board 55 includes a PCB, a plurality of light sources are fixedly connected to the light emitting circuit board 55, the light sources are electrically connected to the light emitting circuit board 55, and the light sources are located below the light guide holes 218. The light emitting circuit board 55 is electrically connected to a controller of the membrane keypad. The light emitting circuit board 55 is provided with a plurality of fourth through holes 56, the fourth through holes 56 are located above the signal triggering portion, the diameter of the fourth through holes 56 can be slightly larger than that of the striking unit 42, and the striking unit 42 can penetrate through the fourth through holes 56 to be in contact with the signal triggering portion when moving. Further, the spindle 421 can be contacted with the signal trigger part through the fourth through hole 56. In this embodiment, the light of the light source enters the accommodating unit 21 through the light guide hole 218 and then is emitted to the outside of the accommodating unit 21 through the light scattering part 219, so that the lower part of the key cap 10 can emit bright light, which not only provides illumination, but also improves the visual effect.

other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

it will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (10)

1. A key of a film keyboard is characterized by comprising a keycap, a shell, an elastic telescopic piece and a pressing device;

The shell comprises an accommodating unit and at least one clamping unit;

the accommodating unit is of a hollow structure;

The clamping unit is positioned on the outer side wall of the accommodating unit and is used for detachably connecting the accommodating unit with an external device;

the pressing device moves relative to the accommodating unit under the action of external force to penetrate through the accommodating unit and comprises a mounting unit and a striking unit;

The mounting unit is in sliding contact with the accommodating unit, one end of the mounting unit penetrates through one end of the accommodating unit and is fixedly connected with the keycap, and the other end of the mounting unit is positioned in the accommodating unit;

The other end of the striking unit penetrates through the other end opposite to one end of the accommodating unit to contact with a circuit device of an external membrane keyboard;

The elastic expansion piece is positioned in the containing unit and is abutted between the mounting unit and the other end of the containing unit.

2. The key according to claim 1, wherein the mounting unit comprises a pressing member and two stoppers;

The pressing piece is in sliding contact with the accommodating unit, one end of the pressing piece penetrates through one end of the accommodating unit and is fixedly connected with the keycap, and the other end of the pressing piece is positioned in the accommodating unit;

the two limiting parts are respectively fixed on the two opposite side walls of the pressing part;

Two opposite inner walls of the accommodating unit are respectively provided with a limiting groove;

the long shaft of the limiting groove extends along the moving direction of the pressing piece and is used for accommodating the limiting piece, so that the pressing piece is limited on the accommodating unit when moving;

and the two telescopic ends of the elastic telescopic piece are respectively abutted between the other end of the pressing piece and the other end of the accommodating unit.

3. The key of claim 1, wherein the number of the clamping units comprises two;

The two clamping units are respectively connected to two opposite outer side walls of the accommodating unit;

The clamping unit comprises a first clamping part and a second clamping part which are protruded towards the surface of the outer side wall far away from the accommodating unit;

The first clamping portion and the second clamping portion are staggered, and the first clamping portion and the second clamping portion are clamped with the external device.

4. The key of claim 3, wherein one of said second snap portions comprises: the clamping device comprises an accommodating groove, a connecting piece and a clamping piece;

The accommodating groove is positioned on the outer side wall of the accommodating unit where the second clamping part is positioned;

One end of the connecting piece is fixedly connected with the side wall of the accommodating groove, and the other end of the connecting piece extends towards the opposite side;

The clamping piece is fixedly connected with the connecting piece and protrudes towards the surface of the outer side wall far away from the accommodating unit.

5. The key of claim 4, wherein another of the second clamping portions is fixedly connected to an outer side wall of the accommodating unit where the other of the second clamping portions is located.

6. The key of claim 2, wherein the pressing member has a receiving cavity;

the accommodating cavity is provided with a limiting through hole at the position close to the elastic telescopic piece;

the striking unit comprises a mandrel, a limiting part and a limiting spring;

The mandrel is in clearance fit with the limiting through hole, one end of the mandrel penetrates into the accommodating cavity through the limiting through hole, and the other end of the mandrel is used for penetrating through the other end opposite to one end of the accommodating unit so as to contact with a circuit device of an external thin-film keyboard;

The limiting part is fixedly connected with one end of the mandrel, is positioned in the accommodating cavity and is used for limiting one end of the mandrel in the accommodating cavity;

The limiting spring is abutted between the accommodating cavity and one end of the mandrel, so that the striking unit moves relative to the mounting unit.

7. The key of claim 6, wherein said spindle has an axially extending receiving cavity;

The accommodating cavity is communicated with one end close to the accommodating cavity;

The axial direction of the limiting spring is overlapped with the axial direction of the mandrel and abuts against and is held between the containing cavity and the inside of the containing cavity.

8. The key according to claim 2, wherein the receiving unit comprises an upper case, a lower case detachably coupled to the upper case, at least two elastic claws, and at least two engaging portions;

The elastic clamping claw is fixedly connected with the bottom edge of the upper shell and extends from the bottom edge of the upper shell to the lower shell;

The clamping part is positioned on the outer side wall of the lower shell, protrudes towards the surface of the outer side wall far away from the lower shell and is clamped with the elastic clamping claw;

The upper shell is detachably connected with the lower shell through elastic clamping claws and clamping parts;

The pressing piece is arranged on the upper shell in a penetrating mode;

the limiting groove is positioned on the inner wall of the upper shell;

and the clamping unit is positioned on the outer side wall of the lower shell.

9. The key of claim 2, wherein said housing further comprises a light guide hole and a light diffusing portion;

The light guide hole is positioned on one side part of the other end part of the accommodating unit and is used for guiding a light source of an external device into the accommodating unit;

The light scattering part is positioned on one end part of the accommodating unit, is opposite to the light guide hole, is provided with an arc surface back to the light guide hole, and is made of transparent materials.

10. A membrane keypad, comprising: a carrier unit, a circuit arrangement and a plurality of keys according to any of claims 1-8;

the upper surface of the bearing unit is provided with a plurality of key mounting holes;

The circuit device is a thin film circuit board, is positioned in the bearing unit and is provided with a plurality of signal triggering parts;

The accommodating unit is detachably connected with the key mounting hole through the clamping unit;

The striking unit penetrates through the other end part opposite to one end part of the accommodating unit to contact the signal triggering part.