CN112713034A

CN112713034A - Passive wireless device

Info

Publication number: CN112713034A
Application number: CN202011473258.5A
Authority: CN
Inventors: 吴小龙; 刘远芳
Original assignee: Zhejiang Yibailong Technology Co ltd
Current assignee: Zhejiang Yibailong Technology Co ltd
Priority date: 2020-12-15
Filing date: 2020-12-15
Publication date: 2021-04-27

Abstract

The invention discloses a passive wireless device which sequentially comprises a key, an inner cover, a driving plate, a PCB (printed Circuit Board) substrate and a bottom shell from outside to inside, wherein the driving plate comprises a driving end, a driven end and swing fulcrums respectively arranged on two sides of the driving plate, so that the driving plate can swing around the swing fulcrums; a ring cavity is formed in the position, opposite to the middle of the driving plate, a micro generator is arranged in the ring cavity, and the micro generator comprises a magnetic group and a coil group which can move relatively; the energy accumulator is made of elastic rigid material, one end of the energy accumulator is linked with the driven end of the driving plate, and the other end of the energy accumulator is linked with the magnetic group or the coil group; compared with the prior art, the invention has the advantages of higher power generation efficiency, lighter driving force, smaller noise and lighter weight.

Description

Passive wireless device

Technical Field

The invention relates to the technical field of passive wireless switching devices, in particular to a passive wireless device.

Background

With the development of the technology, products such as passive wireless switches and passive wireless doorbells have been gradually used in buildings, but the passive wireless switches in the prior art have some technical defects, such as patents with publication numbers CN104407522B and CN106972780, and although the passive wireless switch products produced according to the patents are widely used in buildings, the technical scheme disclosed in the patent still has the technical defects of large driving force during driving and low power generation efficiency; with the continuous development of the smart home industry, people have higher and higher requirements on the experience effect of passive wireless products, and need to have soft hand feeling and extremely low noise; meanwhile, the thickness of the passive wireless switch is required to be matched with the thickness of 10 mm of a traditional wall socket, and the thickness of the passive wireless switch is even thinner, so that the passive wireless switch and the socket can be better matched and used in home decoration, the passive wireless switch and the socket can be matched and installed together, and the home environment is more attractive. Therefore, new market demands put forward higher demands on the passive wireless switch, and a power generation device with higher efficiency, lighter driving force, less noise and thinner product thickness are required, but in the prior art, after the thickness of the passive switch is reduced, the stroke of power generation operation is also significantly reduced, the output power is also reduced, and thus the requirements of the passive switch for light weight and light hand feeling are difficult to meet.

Disclosure of Invention

The invention aims to provide a passive wireless device, which improves the power generation efficiency by more than 50% compared with the prior art.

It is another object of the present invention to provide a passive wireless device that reduces the operating effort by 50% compared to the prior art with power enhancement.

Another object of the present invention is to provide a passive wireless device that is thinner and lighter than the related art.

In order to achieve the above purpose, the invention provides the following technical scheme: a passive wireless device comprises a key, an inner cover, a driving plate, a PCB (printed circuit board) substrate and a bottom shell from outside to inside in sequence, wherein the driving plate comprises a driving end, a driven end and swing fulcrums respectively arranged on two sides of the driving plate, and a support for supporting the swing fulcrums is arranged on the bottom shell, so that the driving plate can swing around the swing fulcrums;

a ring cavity is formed in the position, opposite to the middle of the driving plate, a micro generator is arranged in the ring cavity, and the micro generator comprises a magnetic group and a coil group which can move relatively; the energy accumulator is made of elastic rigid material, one end of the energy accumulator is linked with the driven end of the driving plate, and the other end of the energy accumulator is linked with the magnetic group or the coil group;

when the driving plate swings, the energy accumulator is driven to deform, when the elastic mechanical energy stored in the energy accumulator exceeds a critical value, the elastic mechanical energy is released instantly, and the magnetic group and the coil group are driven to move relatively at a high speed so as to generate a primary instant induced electric energy;

still be equipped with resetting means on the drive plate, resetting means includes the reset torsion spring, the both ends of reset torsion spring are connected respectively on the drain pan of drive plate and passive wireless switch.

Furthermore, the magnetic group comprises a magnet, and a magnetic conductive sheet a and a magnetic conductive sheet b which are respectively arranged on two sides of the magnet, and a magnetic gap is formed between the magnetic conductive sheet a and the magnetic conductive sheet b; the coil group comprises a center pillar, a coil surrounding the center pillar and a magnetic conduction cover wrapping the coil, wherein at least one end of the center pillar extends into the magnetic gap; when the magnetic group and the coil group move relatively, the central column can be alternately adsorbed with the magnetic conductive sheet a or the magnetic conductive sheet b.

Furthermore, the stroke of the middle column in the alternate adsorption motion with the magnetic conductive sheet a or the magnetic conductive sheet b is less than 0.95 mm.

Furthermore, a holder is arranged in the middle of the passive end, a through hole matched with the tail end of the energy accumulator is formed in the holder, and the tail end of the energy accumulator movably penetrates through the through hole.

Further, the thickness of the holder is less than 1.2 mm.

Further, the maximum stroke of the driving end of the driving plate is less than 6 mm.

Further, when the drive plate swings by taking a connecting line of the two swing fulcrums as a rotating shaft, the swing angle of the drive plate is smaller than 9 degrees.

Further, the ratio of the power arm to the resistance arm of the driving plate is 2: 1.

Further, the energy storage critical value of the energy storage device is when the deformation amplitude is 0.3-0.6 mm.

Furthermore, a plurality of key detectors corresponding to the keys are arranged on the PCB substrate, and key detection holes for the key detectors to pass through are correspondingly arranged on the drive plate and the inner cover respectively.

Compared with the prior art, the invention has the advantages that: compared with the prior art, the invention has the advantages of higher power generation efficiency, lighter driving force, smaller noise and lighter weight, simultaneously, the invention also refers to the principle of the camera shutter, and once the shutter speed of the camera is set, the shutter can always keep a set curtain accurately opened at a speed no matter whether the speed of pressing the shutter by hand is fast or slow, and the exposure is carried out within a set time.

Drawings

Fig. 1 is an overall exploded schematic view of the present invention.

Fig. 2 is a schematic structural view of a PCB substrate and a driving board in the present invention.

Fig. 3 is a schematic view showing the construction of a driving plate and a micro-generator according to the present invention.

Fig. 4 is a schematic cross-sectional view of a drive plate and a micro-generator in the present invention.

Fig. 5 is another perspective view of the driving board in the present invention.

Fig. 6 is a schematic view of the structure of the inner lid and the waterproof cover in the present invention.

Fig. 7 is a schematic view of the structure of the inner cap and the sealing cap in the present invention.

Fig. 8 is a partial cross-sectional view of the present invention.

Fig. 9 is a schematic view of the bottom case of the present invention.

Fig. 10 is an enlarged schematic view of the drive plate of fig. 9 at a as mounted.

In the figure: 1. the device comprises a driving plate 101, a driving end 102, a driven end 103, a swing fulcrum 104, a ring cavity 105, a key detection hole 106 and a stopper; 2. the miniature generator comprises a miniature generator 201, a magnet 202, magnetic conductive sheets a and 203, magnetic conductive sheets b and 204, a middle column 205, a coil 206, a magnetic conductive cover 207 and a fixing frame; 3. an energy storage device; 4. a holder 401, a bore; 5. a return torsion spring; 6. a support; 7. a PCB substrate 701, a key detector 702 and an on-board antenna; 8. pressing a key; 9. an inner cover 901, a pivot shaft 902, a light transmission hole 903 and a waterproof fixing screw hole; 10. a waterproof cover; 11. a sealing cover 1101, a driving cover 1102 and a detector cover; 12. bottom shell, 1201, water blocking limit.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further specifically described below by way of embodiments in combination with the accompanying drawings.

Example (b): a passive wireless device is shown in figures 1-10 and comprises a key, an inner cover, a waterproof cover, a drive plate, a PCB substrate provided with a communication circuit and a bottom shell from outside to inside in sequence, wherein the PCB substrate of the communication circuit is laid above the bottom shell to strengthen the strength of the bottom shell, so that the bottom shell is not easy to deform, and meanwhile, the passive switch can be thinned further. The PCB substrate is made of glass fiber (FR4) and has higher hardness; after the thickness of the ultrathin passive switch is reduced, the thickness of the bottom shell is only 1 mm, and the bottom shell is soft, so that the condition of operation failure can be caused when the edge of the upper key is pressed, and after the large-area PCB substrate is arranged on the bottom shell, the strength of the bottom shell can be obviously enhanced; in addition, after the PCB substrate is enlarged, the antenna can be made into an onboard antenna, so that the cost of the antenna is saved, and the speed of assembling products is improved. And a water blocking edge is arranged on the periphery of the PCB on the bottom shell.

The driving plate comprises a driving end, a driven end and swing fulcrums respectively arranged on two sides of the driving plate, the two swing fulcrums can be supported on a bottom shell of the passive wireless switch through a support, specifically, as shown in fig. 10, a horizontal gap is arranged on the support, and the swing fulcrums are clamped in the gap. The connecting line of the two swing fulcrums can form a rotating shaft, so that the driving plate can swing around the connecting line of the two swing fulcrums.

In order to realize an ultra-thin space design, in the embodiment, the driving end is set to have a movement stroke less than 6mm, and if the stroke is too large, the thickness of the passive wireless switch is affected; the width of the driving end is greater than or equal to that of the driven end, and the width of the driving end is greater than or equal to that between the two swing fulcrums.

Meanwhile, the driving plate swings by less than 9 degrees by taking a swing fulcrum connecting line as a rotating shaft in the embodiment, so that the design can ensure abundant energy, and the passive wireless switch can be made thinner; if the swing angle is increased, the space of the ultra-thin design is thickened, and the ultra-thin design of the passive wireless switch cannot be realized.

The moving direction of passive end is opposite with the drive end, compares the swing arm design among the prior art, and the obvious advantage of this embodiment is that the proportion of power arm and resistance arm can reach 2: 1 because can provide bigger laborsaving lever for the drive power that needs to provide in the operation is littleer, and laborsaving effect is better, feels lighter.

In this embodiment, the position of the relative middle part of the driving board is hollowed to form an annular cavity for accommodating the micro-generator, and the micro-generator is electrically connected with the communication circuit on the PCB substrate. The driving plate forms an enclosure shape, and the driving end of the driving plate is taken as a whole, so that the strength of the driving plate can be greatly enhanced while the thickness of the passive wireless switch is reduced. Compared with the swing arm design in patent publication No. CN106972780, the swing arm has larger deformation during pressing operation because the two fixed arms are disconnected, and the swing arm needs to be thickened if the deformation is reduced, which is not beneficial to the design of an ultrathin switch; another drawback of large swing arm deformation is that the generator cannot be driven properly when the outer edge of the switch is pressed. Therefore, the driving plate is designed into a connected body by arranging the annular cavity on the driving plate, so that the driving plate can keep higher mechanical strength and is not easy to deform, and the keys of the passive wireless switch can be freely operated at any operation position; another benefit of looping the drive plate around the micro-generator is that the overall thickness of the passive switch is not increased.

In this embodiment, the two sides of the ring cavity are respectively provided with a stopper, when the passive switch is produced and assembled, the driving board can be rapidly installed on the bottom shell of the passive switch by using the stoppers, and the stoppers are movably clamped by clamping positions of the bottom shell to prevent the driving board from falling off.

In the structure, the micro generator comprises a magnetic group and a coil group which can move relative to each other, wherein the magnetic group comprises a magnet, a magnetic conductive sheet a and a magnetic conductive sheet b which are respectively arranged at two sides of the magnet, and a magnetic gap is formed between the magnetic conductive sheet a and the magnetic conductive sheet b; the coil group comprises a center pillar, a coil surrounding the center pillar and a magnetic conduction cover wrapping the coil, wherein one end of the center pillar extends into the magnetic gap, and when the coil group and the coil group move relatively, the center pillar can be alternately adsorbed with the magnetic conduction sheet a or the magnetic conduction sheet b.

In this embodiment, in order to improve the power generation efficiency to the maximum, the moving stroke of the center pillar when the center pillar and the magnetic conductive sheet a or the magnetic conductive sheet b perform the alternate adsorption movement is limited to be less than 0.95 mm; this is because, in this travel, it is advantageous to make the passive switch thinner, and the micro-generator can ensure sufficient energy supply under the slingshot effect, and if the range is exceeded, the wear of the micro-generator is increased to reduce the service life, and the impact noise is increased significantly to affect the experience of the product. In addition, the moving stroke of the central column during the alternate adsorption movement with the magnetic conductive sheet a or the magnetic conductive sheet b is limited to be less than 0.95mm, which is beneficial to reducing the time of magnetic pole switching so as to generate higher energy.

In this embodiment, the coil assembly is fixedly mounted on a bottom case of the passive wireless switch, the magnet, the magnetic conductive sheet a, and the magnetic conductive sheet b are fixed on a fixing frame, and the fixing frame is movably mounted on the coil assembly or the bottom case, that is, the coil assembly is fixed, and the magnet assembly can move relative to the coil assembly. Of course, the movable magnetic set and the fixed coil set are opposite, and in some designs, the magnetic set may be fixed and the coil set may move, and the embodiment is not limited.

The energy accumulator is used for connecting the driven end of the driving plate and the micro generator, is made of elastic rigid materials, and one end of the energy accumulator is connected with the fixed frame so as to be linked or driven by the magnetic group; the other end is movably connected with the driving plate, specifically, a clamper is arranged at the middle part of the driven end of the driving plate, the clamper is provided with a through hole matched with the tail end of the energy accumulator, and the tail end of the energy accumulator movably penetrates through the through hole. The hollow design of the holder enables the held end of the energy accumulator of the generator to have a more free state when the holder drives the micro generator to generate electricity, so that the two times of energy generated by the pressing drive and the resetting drive can be kept consistent. The clamp holder can be fixedly connected with the driven end in a welding, riveting, buckling connection, screw fixation and other modes; of course, in some cases, the holder may also be integrally formed with the passive end. In order to keep the holder from interfering with the energy store during operation, the thickness of the holder is set to less than 1.2 mm.

When the driving end of the driving plate is driven by a driving force, the swing fulcrum of the driving plate rotates by taking the bracket as a rotating shaft, and the driven end starts to move upwards and is linked with the connecting arm and the holder to move; the movement of the clamper is linked with the energy accumulator, the energy accumulator is bent and deformed, and elastic mechanical energy is stored; when the amplitude of the bending deformation of the energy accumulator is larger than a critical value, the energy accumulator releases elastic mechanical energy and ejects and drives the magnetic group and the coil group to do relative motion at a high speed within 1/100 seconds (hundredth of a second) so as to generate stronger instant induced electric energy; in this embodiment, the energy storage critical value of the energy storage device is when the deformation amplitude of the energy storage device is 0.4mm, that is, when the bending deformation amplitude of the energy storage device is greater than 0.4mm, the energy storage device will release the stored elastic mechanical energy.

It should be noted that, according to the principle of electromagnetic induction, the faster the speed of the relative movement between the coil assembly and the magnet assembly is, the stronger the induced energy is, in the present invention, a set of accelerating device based on the slingshot effect is designed by using the principle of slingshot, so as to accelerate the speed of the relative movement between the coil assembly and the magnet assembly in a narrow space; meanwhile, by considering the principle of a camera shutter, no matter the speed of the shutter is high or low, after the shutter speed is set, the exposure can be finished in a preset time period; therefore, in the invention, the coil group and the magnetic group can complete the switching of the magnetic poles once in 1/100 seconds through the power generation of the slingshot device and the slingshot effect; that is, the cooperation of the micro-generator, the energy accumulator and the driving plate forms a slingshot type high-efficiency power generation device, and the instantaneous acceleration effect of the slingshot effect is utilized to drive the center post to do high-speed relative motion in the magnetic gap; assuming that the central column is adsorbed to the magnetic conductive sheet a at the beginning, the mechanical energy is ejected and released to the magnetic group instantly by utilizing the slingshot effect, so that the central column is adsorbed to the magnetic conductive sheet b within 1/100 seconds; the relative movement speed of the coil group and the magnetic group is accelerated through the slingshot device and the slingshot effect, so that strong induced electric energy can be generated in a narrow space.

It should be noted that the speed of the relative movement between the coil assembly and the magnet assembly is crucial, and if the speed is slower, the generated energy is smaller, which cannot meet the requirement of the energy consumption of the passive switch communication circuit; therefore, in the invention, due to the ultra-thin space limitation of the passive switch, the time for relative movement of the coil group and the magnetic group once can be controlled to be less than 1/100 seconds by utilizing the slingshot effect so as to generate enough energy to drive the communication circuit to work; the generated energy can provide a 2V-3V power supply voltage for the communication circuit after being stabilized, and provides about 7 milliseconds power supply time for the load under the condition that the load current is 10-20 milliamperes, so that the communication circuit can transmit at least 15 bytes of data at the rate of 50Kbps-1Mbps under the transmission power of 10dB, and even can repeatedly transmit, thereby achieving the purpose of ultra-thin passive switch control terminal equipment.

In particular, the energy accumulator is not only capable of applying the stored mechanical energy to the movable magnetic group, but in other embodiments of the invention, the stored mechanical energy of the energy accumulator may also be applied to the coil group; so that the coil assembly and the magnetic assembly can complete high-speed relative movement under the slingshot effect within set time.

The reset device is arranged on one side of the annular cavity of the drive plate and used for resetting after the auxiliary drive plate is pressed, the reset device is a reset torsion spring, one end of the reset torsion spring is connected to the bottom shell of the passive wireless switch, the other end of the reset torsion spring is connected to the drive plate, and the drive plate is provided with a clamping groove or a fixing position for fixing one end of the reset torsion spring. In a static state, the reset torsion spring is set to be in a pre-compression state and has certain elastic mechanical energy, in order to keep the invention to have excellent operation hand feeling and not to appear to be laboursome to press, the force of the reset torsion spring during pre-compression is set to be less than 6N.

In this embodiment, a plurality of key detectors are disposed on a PCB substrate of the communication circuit, and respectively correspond to keys of the passive wireless switch to detect a motion state of the keys; the key detector is arranged on the PCB and can be driven by the key through the driving board, and under some conditions, if the strength of the driving board is enough, the detector hole can be set into any shape.

In this embodiment, be equipped with the work pilot lamp on the PCB base plate, can show communication module's operating condition, correspond, cover in and be equipped with the light trap, the light that the work pilot lamp sent can transmit to the button through the light trap.

In the embodiment, the waterproof cover is arranged on the inner side of the inner cover, and compared with the integrated design of the first inner shell and the second inner shell in the patent publication No. CN106972780, the waterproof cover has the advantage of being simpler and more convenient to assemble and is beneficial to the rapid production of products; in addition, in patent publication No. CN106972780, since the area of the soft rubber is too small, air in the inner case cannot be evacuated, and the use of an air spring causes a poor hand feeling of key operation, and if the soft rubber is pressed forcibly, the inner air is discharged to make the inner cover become vacuum and cannot be restored; the present invention solves this problem; with inner cup and waterproof cover separate design and equipment, increase waterproof cover's volume and deformable scope to and set up some unsmooth positions in waterproof cover, like this when the button is pressed when waterproof cover, the reverse conflict effect of the interior air of waterproof cover is showing and is reducing, and the air can flow to each unsmooth position that sets up, and makes the button operation very smooth and easy.

The sealing cover is arranged below the inner cover and is covered above the sealing cover, the sealing cover is provided with a plurality of detector covers and a plurality of driving covers, and the driving covers are covered at driving positions of the driving plate and have a waterproof effect; the detector cover is positioned above the key detector and sleeved on the key detector, so that the detector can be freely driven by the key and has a waterproof function; meanwhile, the detector cover also has the function of supporting the key. In other words, when the keyboard is static, each key is supported by the corresponding detector cover, and when any key is pressed and collapsed, other keys can be supported by the detector cover to keep the original state, so that the attractiveness of the product is improved, and the phenomenon of misoperation is avoided. Of course, in some other embodiments of the present invention, the supporting device for supporting the key may be implemented at another position, but it is within the scope of the present invention that the adjacent keys can be kept as they are when the key is operated.

In order to facilitate the assembly of the key, the inner cover is provided with a pivot shaft for connecting the key which can pivot, the pivot shaft is not arranged on the bottom shell of the shell but arranged on the inner cover, and the plastic mold is convenient for demolding, so that the production cost is lower; in addition, the area of the PCB substrate can be larger, so that an onboard antenna can be placed in a space, the length of the antenna is longer below the high frequency of 1GHz, and a sufficient antenna space is provided, so that the communication range is favorably increased.

In this embodiment, the inner cup is equipped with waterproof fixed screw hole, through the screw fixation in the drain pan, through the screw fixation, promotes waterproof grade on the one hand, and on the other hand is convenient for the dismantlement maintenance of product.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A passive wireless device is characterized by comprising a key, an inner cover, a driving plate, a PCB (printed Circuit Board) substrate and a bottom shell from outside to inside in sequence, wherein the driving plate comprises a driving end, a driven end and swing fulcrums respectively arranged on two sides of the driving plate, and a support for supporting the swing fulcrums is arranged on the bottom shell, so that the driving plate can swing around the swing fulcrums;

2. The passive wireless device according to claim 1, wherein the magnetic assembly includes a magnet and a magnetic conductive plate a and a magnetic conductive plate b respectively disposed at two sides of the magnet, and a magnetic gap is formed between the magnetic conductive plate a and the magnetic conductive plate b; the coil group comprises a center pillar, a coil surrounding the center pillar and a magnetic conduction cover wrapping the coil, wherein at least one end of the center pillar extends into the magnetic gap; when the magnetic group and the coil group move relatively, the central column can be alternately adsorbed with the magnetic conductive sheet a or the magnetic conductive sheet b.

3. The passive wireless device according to claim 2, wherein the stroke of the central pillar in the alternate attracting motion with the magnetic conductive sheet a or the magnetic conductive sheet b is less than 0.95 mm.

4. The passive wireless device as claimed in claim 1, wherein a holder is provided at a middle portion of the passive end, the holder is provided with a through hole matching with the tail end of the energy storage device, and the tail end of the energy storage device is movably inserted into the through hole.

5. A passive radio device according to claim 1, characterized in that the thickness of the holder is less than 1.2 mm.

6. A passive wireless device according to claim 1, wherein the maximum stroke of the drive end of the drive board is less than 6 mm.

7. The passive wireless device as claimed in claim 6, wherein the driving board swings at an angle of less than 9 ° when swinging around a connecting line of two swing pivots as a rotating shaft.

8. A passive wireless device, according to claim 6 or claim 7, wherein the ratio of the power arm to the resistive arm of the drive plate is 2: 1.

9. The passive wireless device of claim 1, wherein the energy storage threshold of the energy storage device is 0.3-0.6mm in deformation.

10. The passive wireless device as claimed in claim 1, wherein a plurality of key detectors corresponding to the keys are disposed on the PCB substrate, and the driving board and the inner cover are respectively and correspondingly disposed with key detection holes for the key detectors to pass through.