CN209627347U - A kind of magnetic inductive ultra-thin key switch - Google Patents

Abstract

The utility model discloses a kind of magnetic inductive ultra-thin key switches, including the pedestal being set on pcb board, the lid being set to above pedestal and the balancing stand being set between pedestal and lid, it is characterized in that, further including the magnetic substance being set on lid and the hall effect sensor for being set to below magnetic substance and being electrically connected to pcb board.Magnetic inductive ultra-thin key provided by the utility model switchs, and presses steady, good hand touch, uses for a long time, and still movement is accurate, and induction is sensitive, and long service life, integral thickness is thin, conducive to slimming is realized.

Description

A kind of magnetic inductive ultra-thin key switch

Technical field

The utility model relates to a kind of key switches more particularly to a kind of magnetic inductive ultra-thin key to switch.

Background technique

As various electronic equipments constantly develop to slimming, it is also required to do applied to the key switch on electronic equipment It obtains more and more thinner.Such as Ultrathin notebook computer, in order to enable laptop to reach ultrathin standard, keyboard of notebook computer On key switch have to be made than relatively thin, while also to guarantee its performance and feel.

In general, the conducting principle of key switch is the conducting and disconnection moved up and down come triggering and conducting component by leading core, To realize the conducting and break function of key switch.And feed-through assembly is usually to form mechanical conducting group by stationary plate and movable plate Part, the movable contact that movable plate is triggered by leading core, which is in contact with the stationary contact of stationary plate with separating, realizes conducting and break function.

And this mechanical feed-through assembly, reserved space is needed in key switch to install, and occupied space is big；Meanwhile being Meets the needs of to feel, it is also necessary to corresponding feel recurring structure in increase.Therefore, numerous structures combine, so that pressing Key switch is difficult to reach slimming, and pressing feel is difficult to have both simultaneously with slimming.Moreover, after key switch is used for a long time, The movable contact of movable plate is frequently contacted and is separated with the stationary contact of stationary plate, once for a long time after, surface is also easy to produce abrasion, service life It is short, the stability in use and usage safety performance of key switch are influenced, even results in and cannot achieve conducting and break function.

Utility model content

In view of the above deficiencies, the purpose of this utility model is to provide a kind of magnetic inductive ultra-thin key switches, by pressing Surely, good hand touch uses for a long time, and still movement is accurate, and induction is sensitive, and long service life, integral thickness is thin, is conducive to realize slim Change.

Used technical solution is the utility model in order to achieve the above objectives:

A kind of magnetic inductive ultra-thin key switch, including be set on pcb board a pedestal, be set to above pedestal one Lid and the balancing stand being set between pedestal and lid, which is characterized in that further include the magnetism being set on lid Body and the hall effect sensor for being set to below magnetic substance and being electrically connected to pcb board.

The magnetic substance is set to lid lower end surface as a further improvement of the utility model,.

The lid lower end surface is provided with sleeve as a further improvement of the utility model, has in the casing There is an accommodating cavity, the magnetic substance is set in accommodating cavity, and is offered in the lower end face and be connected to the one of accommodating cavity and open Mouthful.

The hall effect sensor is set to pcb board lower end surface as a further improvement of the utility model, in the base A through-hole is offered respectively at seat and the position for corresponding to hall effect sensor on pcb board.

The hall effect sensor is set to pcb board upper surface as a further improvement of the utility model, in the base Correspond at the position of hall effect sensor to offer on seat and passes through a relief hole for hall effect sensor.

The magnetic substance is magnet as a further improvement of the utility model,.

The balancing stand includes an a balancing pole A and balancing pole B, the balance as a further improvement of the utility model, An elastic component is connected between bar A and balancing pole B.

The elastic component is tension spring as a further improvement of the utility model, is formed on the balancing pole A for drawing The dog hole A that spring one end hooks into is formed with the dog hole B hooked into for the tension spring other end on the balancing pole B.

The balancing pole A is enclosed type frame structure as a further improvement of the utility model, and the balancing pole B is U Type structure；A slotting axis is respectively arranged in the two balancing pole A opposite outer side edges, and opposite in balancing pole A one end Inserting column A on one in insertion lid is respectively arranged in two outer side edges；It is set respectively on two opposite inner side edges of the balancing pole B It is equipped with the jack for inserting axis insertion, and is respectively arranged with insertion pedestal in two opposite outer side edges of balancing pole B one end In inserting column once, be respectively arranged on the opposite two sides in the other end the balancing pole B insertion lid in one on inserting column B。

A sounding elastomer is provided between the pedestal and lid as a further improvement of the utility model, it should Deformation occurs and hits lid, pedestal and/or balancing stand and makes a sound by lid drive for sounding elastomer.

Sounding elastomer both ends are set on pedestal as a further improvement of the utility model,.

Be provided with a fixed bracket on the pedestal as a further improvement of the utility model, the fixation bracket to On extend to form two pieces of branch pieces, offer a branch piece jack respectively in two pieces of branch on pieces, which is inserted in Wherein in the branch piece jack of a piece of branch piece, the other end is inserted in the branch piece jack of other a piece of branch piece.

One first pedestal jack, In are offered on one inner wall of pedestal as a further improvement of the utility model, One second pedestal jack is offered on another inner wall of the pedestal, which is inserted in the first pedestal jack, separately One end is inserted in the second pedestal jack.

Sounding elastomer both ends are set on lid as a further improvement of the utility model, in the lid One first lid jack is offered on one inner wall, and one second lid jack is offered on another inner wall of the lid, the sounding bullet Property body one end is inserted in the first lid jack, and the other end is inserted in the second lid jack.

One be convexly equipped on the balancing stand below sounding elastomer as a further improvement of the utility model, Convex block.

The sounding elastomer is elastic slice or elastic wire as a further improvement of the utility model,.

The utility model has the following beneficial effects:

(1) made by adding magnetic substance (magnet) and the hall effect sensor being electrically connected on circuit board on lid It is passed for the magnetic inductive feed-through assembly of key switch by moving up and down for lid to change magnetic substance (magnet) and Hall effect Distance between sensor contacts conducting compared to traditional dynamic and static plate to realize the conducting and break function of key switch Mechanical conducting structure, not only reduce conducting structure occupied space, reach slimming, and magnetic inductive conducive to key switch Conduction mode movement is accurate, incudes sensitive, structural stability height, during lid moves up and down, because magnetic inductive is connected Component is not in contact collision with other structures, is used for a long time without abrasion, long service life, ensure that its stability in use and Usage safety performance；

(2) it by connecting a tension spring between balancing pole A and balancing pole B, is combined up and down by balancing pole A with balancing pole B It swings to balance out pressing force in the component of inclined direction, makes key stress equalization, improve whole pressing equilibrant force；And it can be with Elastic restoring force is provided for pressing conducting function, the upper swing for balancing pole A and balancing pole B provides motive force, as balancing pole A Offer elastic restoring force is swung up and down with balancing pole B, guarantees that balancing pole A and balancing pole B swings up and down the precise and stable of movement, To further increase pressing equilibrant force；Balancing pole A and balancing pole B are pulled by tension spring, significantly increase pressing stroke, and press Balancing stand is flipped movement when lid, so that manpower is obtained a kind of break and falls sense of touch, improves pressing feel；

(3) by adding sounding elastomer, when pressing lid, promoted sounding elastomer by lid deformation occurs, rebound, It overturns and hits lid, pedestal and/or balancing stand and make a sound, realize pressing sounding effect, and since it has elasticity special Property, pressing feel can be improved, promote user experience, meanwhile, the direct impact force hit to key switch internal structure can be weakened, Protect internal structure without impaired.

Above-mentioned is the general introduction of utility model technical solution, below in conjunction with attached drawing and specific embodiment, to the utility model It is described further.

Detailed description of the invention

Fig. 1 is the explosive view of embodiment one；

Fig. 2 is the external structure schematic diagram of embodiment one；

Fig. 3 is the partial structure diagram of embodiment one；

Fig. 4 is the structural schematic diagram that magnetic substance is set to lid lower end surface in embodiment one；

Fig. 5 is the exploded view of part-structure in embodiment one；

Fig. 6 is the structural schematic diagram that hall effect sensor is set to pcb board lower end surface in embodiment one；

Fig. 7 is the structural schematic diagram that hall effect sensor is set to pcb board upper surface in embodiment one；

Fig. 8 is that key switch is in the sectional view for not pressing off-state in embodiment one；

Fig. 9 is the sectional view that key switch is in pressing on state in embodiment one；

Figure 10 is the structural schematic diagram that balancing stand is combined with elastic component in embodiment one；

Figure 11 is the explosive view of balancing stand in embodiment one；

Figure 12 is the bottom substance schematic diagram of pedestal in embodiment one；

Figure 13 is the structural schematic diagram that balancing stand is combined with lid in embodiment one；

Figure 14 is the explosive view of embodiment two；

Figure 15 is to fix the structural schematic diagram that bracket is set on pedestal in embodiment two；

Figure 16 is that sounding elastomer is set to the structural schematic diagram on fixed bracket in embodiment two；

Figure 17 is that for key switch in when not pressing off-state, sounding elastomer is in upward arch shape in embodiment two Structural schematic diagram；

When Figure 18 is that key switch is in pressing on state in embodiment two, sounding elastomer is in downward arch shape One structural schematic diagram；

When Figure 19 is that key switch is in pressing on state in embodiment two, sounding elastomer is in downward arch shape Another structural schematic diagram；

Figure 20 is that sounding elastomer is set to the structural schematic diagram in pedestal jack in embodiment two；

Figure 21 is that sounding elastomer is set to the structural schematic diagram on lid in embodiment two.

Specific embodiment

Further to illustrate that the utility model is the technical means and efficacy for reaching predetermined purpose and being taken, below in conjunction with Specific embodiment of the present utility model is described in detail in attached drawing and preferred embodiment.

Embodiment one:

Fig. 1 to Fig. 7 is please referred to, the present embodiment provides a kind of magnetic inductive ultra-thin key switches, including are set to pcb board 10 On a pedestal 1, the balancing stand 3 that is set to a lid 2 of the top of pedestal 1 and is set between pedestal 1 and lid 2, In, pedestal 1 can be welded on pcb board 10 by the leg 14 of bottom, naturally it is also possible to corresponding card be arranged on pedestal 1 Button 15, is buckled on pcb board 10.The present embodiment key switch further includes the magnetic substance 4 being set on lid 2 and is set to magnetic Property the lower section of body 4 and be electrically connected to a hall effect sensor 5 of pcb board 10, wherein preferred, magnetic substance 4 is magnet.By magnetic Property body 4 combined with both hall effect sensors 5, constitute the magnetic conducting group for realizing key switch conducting and break function Part.

In the present embodiment, as shown in figs. 4 and 5, the magnetic substance 4 is set to 2 lower end surface of lid, and can be located at Right above hall effect sensor 5.Specifically, being provided with sleeve 20 in 2 lower end surface of lid, have in the casing 20 One accommodating cavity, the magnetic substance 4 are set in accommodating cavity, and are offered in 20 lower end surface of casing and be connected to the one of accommodating cavity and open Mouth 201.Meanwhile magnetic substance 4 can be placed in integrated injection molding in casing 20 and form, alternatively, directly in the external casing 20 of magnetic substance 4, Magnetic substance 4 is fixed in casing 20.

Meanwhile the setting for hall effect sensor 5, there are two types of modes.

First way are as follows: as shown in figs. 5 and 6, hall effect sensor 5 is set to 10 lower end surface of pcb board, in the base A through-hole (16,101) are offered respectively at seat 1 and the position for corresponding to hall effect sensor 5 on pcb board 10.

The second way are as follows: as shown in fig. 7, the hall effect sensor 5 is set to 10 upper surface of pcb board, in the base Correspond at the position of hall effect sensor 5 to offer on seat 1 and passes through a relief hole 17 for hall effect sensor 5.

The conducting of the present embodiment magnetic inductive and disconnection principle are as follows:

When not pressing down on lid 2, as shown in figure 8, the Hall effect on magnetic substance 4 (magnet) and pcb board 10 senses Device 5 is apart from far, hall effect sensor 5 incudes the magnetism less than magnetic substance 4 (magnet), i.e. 5 nothing of hall effect sensor enough Signal generates, and circuit disconnects, i.e., key switch is in an off state.And when pressing down on lid 2, as shown in figure 9, magnetic substance 4 (magnet) are moved down with lid 2, and the distance between magnetic substance 4 (magnet) and hall effect sensor 5 shorten, when between the two Distance Shortened to certain value when, hall effect sensor sense 5 should arrive magnetism, i.e. hall effect sensor 5 produces signal (example Such as, resistance value changes signal, signal of voltage value change etc.), and circuit is sent signal to, circuit is connected, then key It switchs in the conductive state.When pressing of the release to lid 2, is acted on by the upper pendulum of balancing stand 3, lid 2 is driven to move up reset, Magnetic substance 4 (magnet) is moved up with lid 2, then magnetic substance 4 (magnet) and hall effect sensor 5 are remote apart from change, Hall effect Sensor 5 incudes the magnetism less than magnetic substance 4 (magnet), i.e. 5 no signal of hall effect sensor generates, and circuit disconnects, that is, presses Key switch restores to off-state, then switchs and form an on-off circulation in circuit.

In the present embodiment, as shown in Figure 10 to Figure 13, the balancing stand 3 includes an a balancing pole A 31 and balancing pole B 32, an elastic component 33 is connected between balancing pole A31 and balancing pole B 32, it is preferred that the elastic component 33 is tension spring 33'.Together When, the dog hole A 311 hooked into for the one end tension spring 33' is formed on the balancing pole A 31, on the balancing pole B 32 It is formed with the dog hole B 321 hooked into for the tension spring 33' other end.

Specifically, the balancing pole A 31 is enclosed type frame structure, the balancing pole B 32 is U-shaped structure；It is described flat Be respectively arranged with a slotting axis 312 in opposite two outer side edges of weighing apparatus bar A 31, and the balancing pole 31 one ends of A it is opposite two outside Inserting column A313 on one in insertion lid 2 is respectively arranged on side.Meanwhile two inner side edges opposite in the balancing pole B 32 On be respectively arranged with the jack 322 being inserted into for inserting axis 312, and in two opposite outer side edges of the balancing pole 32 one ends of B point It is not provided with inserting column 323 once in insertion pedestal 1, is respectively set on the opposite two sides in 32 the other end balancing pole B There is inserting column B 324 on one in insertion lid 2.

Which during key switch pressing is connected, regardless of the position on pressing lid 2, by balancing pole A31 and put down Weighing apparatus bar B 32, which is combined, to be swung up and down to balance out pressing force in the component of inclined direction, is made key stress equalization, is improved whole Press equilibrant force.Meanwhile elasticity is provided with swinging up and down for balancing pole B 32 for balancing pole A31 by elastic component 33 (tension spring 33') The upper wobbling action (restoring to v-shaped structure on 3 top of balancing stand) of restoring force, balancing pole A31 and balancing pole B 32 is drawn by tension spring 33' It rises, prevents balancing pole A31 and balancing pole B 32 deviates the wobble tracks of former setting, to further increase pressing equilibrant force, and by The upper swing of balancing pole A31 and balancing pole B 32 drives lid 2 to move up reset.Meanwhile by tension spring 33' pull balancing pole A31 with Balancing pole B 32 significantly increases pressing stroke, and balancing stand is flipped movement when pressing lid 2, and manpower is made to obtain one Kind is disconnected to fall sense of touch, improves pressing feel.

Embodiment two:

As shown in Figure 14 to Figure 21, the present embodiment and the main distinction of embodiment one are: in the pedestal 1 and lid 2 Between be provided with a sounding elastomer 7, sounding elastomer 7 can be made of plastic cement or metal, concretely elastic slice or Elastic Steel Silk, the present embodiment attached drawing are that elastic slice is illustrated as an example with sounding elastomer 7, the present embodiment sounding elastomer 7 (elastic slice) Drive deformation occurs to hit lid 2, pedestal 1 and/or balancing stand 3 with springing back and make a sound by lid 2.

In the present embodiment, it in order to cooperate the sounding of sounding elastomer 7, is convexly equipped on the balancing stand 3 positioned at sounding One convex block 30 of 7 lower section of elastomer, when sounding elastomer 7 downwardly turns over and generates deformation, sounding elastomer 7 is in addition to that can tap Outside 1 sounding of pedestal, 30 sounding of convex block can also be tapped, meanwhile, it is multiple that convex block 30 can also drive sounding elastomer 7 to be flipped up Position, as shown in figure 19.

7 both ends of the present embodiment sounding elastomer can be set on pedestal 1, also can be set on lid 2.

When 7 both ends of sounding elastomer are set on pedestal 1, first way are as follows: as shown in Figure 15 and Figure 16, described A fixed bracket 11 is provided on pedestal 1, which upwardly extends to form two pieces of branch pieces 111, in two pieces of branch pieces 111 Upper to offer a branch piece jack 1111 respectively, which is inserted in the branch piece jack of wherein a piece of branch piece 111 In 1111, the other end is inserted in the branch piece jack 1111 of other a piece of branch piece 111.When not pressing down on lid 2, sounding bullet Property body 7 (elastic slice) be in upward arch shape, as shown in figure 16 and figure 17；When pressing down on lid 2,7 (bullet of sounding elastomer Piece) push down on that deformation occurs by lid 2, promote sounding elastomer 7 (elastic slice) to downwardly turn over and hits pedestal 1 and/or balancing stand 3 It makes a sound, at this point, sounding elastomer 7 (elastic slice) is in downward arch shape, as shown in Figure 18 and Figure 19.When release is to lid 2 Pressing when, down force that sounding elastomer 7 (elastic slice) is subject to disappears, and can be driven and be sent out by the convex block 30 on balancing stand 3 Rebound overturning resets acoustic elasticity body 7 (elastic slice) upwards, hits lid 2 when rebound and makes a sound, at this point, 7 (bullet of sounding elastomer Piece) restore to upward arch shape.When pressing lid 2 repeatedly, sounding elastomer 7 (elastic slice) hits lid 2, pedestal 1 repeatedly And/or balancing stand 3 makes a sound.

The second way are as follows: as shown in figure 20, offer one first pedestal jack 12, In on 1 one inner wall of pedestal One second pedestal jack 13 is offered on another inner wall of pedestal 1, which is inserted in the first pedestal jack 12 In, the other end is inserted in the second pedestal jack 13.It is similar to first way, when not pressing down on lid 2, sounding elasticity Body 7 (elastic slice) is in upward arch shape, as shown in figure 20；When pressing down on lid 2, sounding elastomer 7 (elastic slice) is by lid 2 It pushes down on that deformation occurs, promotes sounding elastomer 7 (elastic slice) to downwardly turn over and hit pedestal 1 and/or balancing stand 3 makes a sound, At this point, sounding elastomer 7 (elastic slice) is in downward arch shape.When unclamping the pressing to lid 2, sounding elastomer 7 (elastic slice) The down force being subject to disappears, and sounding elastomer 7 (elastic slice) rebound overturning upwards can be driven by the convex block 30 on balancing stand 3 It resets, hits lid 2 when rebound and make a sound, at this point, sounding elastomer 7 (elastic slice) restores to upward arch shape.When anti- When pressing lid 2 again, sounding elastomer 7 (elastic slice) hits lid 2, pedestal 1 and/or balancing stand 3 repeatedly and makes a sound.

When 7 both ends of sounding elastomer are set on lid 2, as shown in figure 21, offered on 2 one inner wall of lid One first lid jack 21 offers one second lid jack 22 on another inner wall of lid 2,7 one end of sounding elastomer It is inserted in the first lid jack 21, the other end is inserted in the second lid jack 22.When not pressing down on lid 2, sounding Elastomer 7 (elastic slice) is in downward arch shape, as shown in figure 21；When pressing down on lid 2, sounding elastomer 7 (elastic slice) with Lid 2 move down, when sounding elastomer 7 (elastic slice) touches the structure on pedestal 1, the structure on pedestal 1 pushes up hair Acoustic elasticity body 7 (elastic slice) brings it about deformation, promotes sounding elastomer 7 (elastic slice) to be flipped up shock lid 2 and makes a sound, this When, sounding elastomer 7 (elastic slice) is in upward arch shape.When unclamping to the pressing of lid 2, sounding elastomer 7 (elastic slice) by The upward active force that arrives disappears, and sounding elastomer 7 (elastic slice) rebound overturning downwards resets, and when rebound hits pedestal 1 and/or balance Frame 3 and make a sound, at this point, sounding elastomer 7 (elastic slice) restores to downward arch shape.When pressing lid 2 repeatedly, sounding Elastomer 7 (elastic slice) hits lid 2, pedestal 1 and/or balancing stand 3 repeatedly and makes a sound.

The above descriptions are merely preferred embodiments of the present invention, not makees to the technical scope of the utility model Any restrictions, therefore technical characteristic identical or approximate with the utility model above-described embodiment is used, and obtained other structures, It is within the protection scope of the utility model.

Claims (16)

1. a kind of magnetic inductive ultra-thin key switch, including the pedestal being set on pcb board, the lid being set to above pedestal Son and the balancing stand that is set between pedestal and lid, which is characterized in that further include the magnetic substance being set on lid, And it is set to below magnetic substance and is electrically connected to a hall effect sensor of pcb board.

2. magnetic inductive ultra-thin key switch according to claim 1, which is characterized in that the magnetic substance is set to lid Lower end surface.

3. magnetic inductive ultra-thin key switch according to claim 2, which is characterized in that be arranged in the lid lower end surface There is sleeve, there is an accommodating cavity in the casing, the magnetic substance is set in accommodating cavity, and is opened up in the lower end face There is the opening for being connected to accommodating cavity.

4. magnetic inductive ultra-thin key switch according to claim 1, which is characterized in that the hall effect sensor is set It is placed in pcb board lower end surface, it is logical corresponding to offering one respectively at the position of hall effect sensor on the pedestal and pcb board Hole.

5. magnetic inductive ultra-thin key switch according to claim 1, which is characterized in that the hall effect sensor is set It is placed in pcb board upper surface, corresponds at the position of hall effect sensor on the base and offers for hall effect sensor Across a relief hole.

6. magnetic inductive ultra-thin key switch according to claim 1, which is characterized in that the magnetic substance is magnet.

7. magnetic inductive ultra-thin key switch according to claim 1, which is characterized in that the balancing stand includes a balance A bar A and balancing pole B, is connected with an elastic component between balancing pole A and balancing pole B.

8. magnetic inductive ultra-thin key switch according to claim 7, which is characterized in that the elastic component is tension spring, In It is formed with the dog hole A hooked into for tension spring one end on the balancing pole A, is formed on the balancing pole B for the tension spring other end The dog hole B hooked into.

9. magnetic inductive ultra-thin key switch according to claim 7, which is characterized in that the balancing pole A is enclosed type Frame structure, the balancing pole B are U-shaped structure；A slotting axis is respectively arranged in the two balancing pole A opposite outer side edges, and Inserting column A on one in insertion lid is respectively arranged in two opposite outer side edges of balancing pole A one end；In the balancing pole The jack for inserting axis insertion, and two outsides opposite in balancing pole B one end are respectively arranged on two B opposite inner side edges The inserting column once being respectively arranged in insertion pedestal on side, is respectively set on the opposite two sides in the other end balancing pole B There is inserting column B on one in insertion lid.

10. according to claim 1 to any magnetic inductive ultra-thin key switch in 9, which is characterized in that in the pedestal A sounding elastomer is provided between lid, the sounding elastomer by lid drive deformation occurs and hit lid, pedestal and/ Or balancing stand makes a sound.

11. magnetic inductive ultra-thin key switch according to claim 10, which is characterized in that sounding elastomer both ends It is set on pedestal.

12. magnetic inductive ultra-thin key switch according to claim 11, which is characterized in that be provided on the pedestal One fixed bracket, the fixation bracket upwardly extend to form two pieces of branch pieces, offer a branch piece jack respectively in two pieces of branch on pieces, The sounding elastomer one end is inserted in the branch piece jack of wherein a piece of branch piece, and the other end is inserted in the branch piece of other a piece of branch piece In jack.

13. magnetic inductive ultra-thin key switch according to claim 11, which is characterized in that on one inner wall of pedestal One first pedestal jack is offered, one second pedestal jack is offered on another inner wall of the pedestal, the sounding elastomer one end It is inserted in the first pedestal jack, the other end is inserted in the second pedestal jack.

14. magnetic inductive ultra-thin key switch according to claim 10, which is characterized in that sounding elastomer both ends It is set on lid, offers one first lid jack on one inner wall of lid, offered on another inner wall of the lid One second lid jack, the sounding elastomer one end are inserted in the first lid jack, and the other end is inserted in the second lid jack In.

15. magnetic inductive ultra-thin key switch according to claim 10, which is characterized in that the projection on the balancing stand There is the convex block being located at below sounding elastomer.

16. magnetic inductive ultra-thin key switch according to claim 10, which is characterized in that the sounding elastomer is bullet Piece or elastic wire.