CN114509930B - Electronic watch crown module and electronic equipment - Google Patents
Electronic watch crown module and electronic equipment Download PDFInfo
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- CN114509930B CN114509930B CN202111591100.2A CN202111591100A CN114509930B CN 114509930 B CN114509930 B CN 114509930B CN 202111591100 A CN202111591100 A CN 202111591100A CN 114509930 B CN114509930 B CN 114509930B
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- 230000005674 electromagnetic induction Effects 0.000 claims abstract description 31
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 23
- 230000006698 induction Effects 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 238000003754 machining Methods 0.000 abstract description 4
- 230000000149 penetrating effect Effects 0.000 abstract description 3
- 230000004907 flux Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 208000033897 Systemic primary carnitine deficiency Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 208000016505 systemic primary carnitine deficiency disease Diseases 0.000 description 1
- 238000007514 turning Methods 0.000 description 1
- 230000002618 waking effect Effects 0.000 description 1
- 210000000707 wrist Anatomy 0.000 description 1
Classifications
-
- G—PHYSICS
- G04—HOROLOGY
- G04G—ELECTRONIC TIME-PIECES
- G04G17/00—Structural details; Housings
-
- G—PHYSICS
- G04—HOROLOGY
- G04G—ELECTRONIC TIME-PIECES
- G04G21/00—Input or output devices integrated in time-pieces
- G04G21/02—Detectors of external physical values, e.g. temperature
- G04G21/025—Detectors of external physical values, e.g. temperature for measuring physiological data
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- G—PHYSICS
- G04—HOROLOGY
- G04G—ELECTRONIC TIME-PIECES
- G04G21/00—Input or output devices integrated in time-pieces
- G04G21/08—Touch switches specially adapted for time-pieces
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biophysics (AREA)
- General Health & Medical Sciences (AREA)
- Physiology (AREA)
- Electric Clocks (AREA)
Abstract
The invention discloses an electronic watch crown module and electronic equipment, comprising: the electromagnetic induction device comprises a shell forming an accommodating space, a rotating shaft penetrating through the shell, and a magnetic assembly and an electromagnetic induction assembly which are accommodated in the accommodating space; the magnetic component comprises a ring-shaped magnet arranged on the rotating shaft, the ring-shaped magnet is magnetized along the radial direction of the ring-shaped magnet, and the ring-shaped magnet and the rotating shaft are coaxially arranged; the electromagnetic induction assembly comprises a C-shaped iron core and a coil wound on the C-shaped iron core, the C-shaped iron core is provided with a notch, a part of the annular magnet is located at the notch, so that the coil is located in a magnetic field formed by the annular magnet, when the rotating shaft rotates, the annular magnet moves relative to the coil, and the coil generates induced electromotive force, so that the electromagnetic induction assembly can collect the rotating speed and/or the rotating angle of the rotating shaft. The electronic watch crown module has lower requirements on machining precision and assembly precision, reduces production difficulty, improves product yield, and reduces production cost.
Description
Technical Field
The invention relates to the technical field of intelligent wearable equipment. And more particularly, to an electronic crown module and an electronic device.
Background
With the development of electronic technology, more and more intelligent wearable devices, particularly intelligent watches, gradually walk into lives of people, and crowns are important input components of the intelligent watches, wherein one is used as key operation, and the other is used as rotation operation. At present, a crown is usually rotated by adopting an optical mode, for example, a grating disk is arranged on a rotating shaft of the crown and used for measuring the angle and the angular displacement of the rotating shaft, and the requirements of the structure on the processing precision and the assembly precision of components are very high, so that the production yield of the crown is low.
Disclosure of Invention
The invention aims to provide an electronic watch crown module and electronic equipment. The electronic watch crown module has lower requirements on machining precision and assembly precision, and higher product yield.
According to an aspect of the present invention, there is provided an electronic crown module comprising: the electromagnetic induction device comprises a shell, a rotating shaft, a magnetic assembly and an electromagnetic induction assembly, wherein the shell forms an accommodating space, the rotating shaft penetrates through the shell, and the magnetic assembly and the electromagnetic induction assembly are accommodated in the accommodating space;
the magnetic assembly comprises a ring-shaped magnet fixed on the rotating shaft, the ring-shaped magnet is magnetized along the radial direction of the ring-shaped magnet, and the ring-shaped magnet and the rotating shaft are coaxially arranged;
the electromagnetic induction assembly comprises a C-shaped iron core and a coil wound on the C-shaped iron core, wherein the C-shaped iron core is provided with a notch, a part of the annular magnet is located at the notch, so that the coil is located in a magnetic field formed by the annular magnet, when the rotating shaft rotates, the annular magnet moves relative to the coil, and the coil generates induced electromotive force so that the electromagnetic induction assembly can collect the rotating speed and/or the rotating angle of the rotating shaft.
Preferably, the magnetic assembly further comprises a supporting disc fixedly connected with the rotating shaft, and the annular magnet is arranged on the surface of the supporting disc.
Preferably, the electromagnetic induction assembly further comprises a flexible circuit board, an upper cover and a lower cover which enclose to form a containing cavity, the C-shaped iron core and the coil are located in the containing cavity, the coil is connected with a processor unit on the flexible circuit board, and the processor unit and the coil form a loop so that the processor unit can collect induction current signals of the coil.
Preferably, the coil includes a first coil and a second coil connected in series, the first coil and the second coil being wound on both sides of the C-shaped core, respectively.
Preferably, a plurality of magnets are arranged side by side on the support plate to form the annular magnet, the magnetic pole directions of the magnets are arranged along the radial direction of the support plate, and the magnetic poles of the adjacent magnets are oppositely arranged.
Preferably, a plurality of magnets are arranged side by side on the support disc to form the annular magnet, the magnetic pole directions of the magnets are arranged along the radial direction of the support disc, the magnetic poles of adjacent magnets are the same, and the magnetic field strengths are different.
Preferably, a cap is arranged at one end of the rotating shaft, which is positioned at the outer side of the shell, a conductive sheet connected with the processor unit is embedded on the inner side surface of the shell, and a fixing sheet contacted with the conductive sheet is arranged on the rotating shaft, so that the cap is electrically connected with the processor unit.
Preferably, the other end of the rotating shaft is located in the shell, the rotating shaft can move along the axis direction of the rotating shaft, a key is arranged in the shell, and the other end of the rotating shaft triggers the key through the axial movement of the rotating shaft.
Preferably, an elastic element for driving the rotating shaft to axially move is arranged on the rotating shaft.
According to one aspect of the present invention, an electronic device is provided, including the electronic crown module described above.
The beneficial effects of the invention are as follows:
according to the electronic watch crown module, the annular magnet moves relative to the coil of the electromagnetic induction assembly, so that the electromagnetic induction assembly collects the rotation speed and/or angle of the rotating shaft, the requirements on machining precision and assembly precision are reduced, the production difficulty is reduced, the product yield is improved, and the production cost is reduced.
Drawings
The following describes the embodiments of the present invention in further detail with reference to the drawings.
Fig. 1 shows a schematic structure of an electronic crown module according to the present invention.
Fig. 2 shows an exploded view of the electronic crown module of the present invention.
Fig. 3 shows a cross-sectional view of the electronic crown module of the invention.
Fig. 4 shows a schematic partial structure of the electronic crown module of the present invention.
Fig. 5 shows an exploded view of the electromagnetic induction assembly of the electronic crown module of the present invention.
Detailed Description
In order to more clearly illustrate the present invention, the present invention will be further described with reference to preferred embodiments and the accompanying drawings. Like parts in the drawings are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and that this invention is not limited to the details given herein.
Some embodiments of the present disclosure include an electronic crown module that may be incorporated into a portable electronic device to provide input. The portable electronic device may be a smart wearable device, which in some embodiments is a smart watch, smart bracelet, or the like that can be worn on a user's wrist.
In one embodiment of the electronic crown module of the present invention shown in fig. 1 and 2, the electronic crown module includes a housing 10, a rotation shaft 20, a magnetic assembly 30, and an electromagnetic induction assembly 40, wherein a receiving space is formed in the housing 10, and the magnetic assembly 30 and the electromagnetic induction assembly 40 are received in the receiving space. The rotating shaft 20 penetrates through the shell 10, the rotating shaft 20 can rotate around the axis of the rotating shaft 20, the electromagnetic induction assembly 40 is fixedly arranged in the shell 10, the magnetic assembly 30 is fixedly connected with the rotating shaft 20, when the rotating shaft 20 rotates, the magnetic assembly 30 moves relative to the electromagnetic induction assembly 40, namely, a magnetic field formed by the magnetic assembly 30 moves relative to the electromagnetic induction assembly 40, the electromagnetic induction assembly 40 generates electromotive force according to electromagnetic induction phenomenon, and if the electromagnetic induction assembly 40 is closed into a loop, induced current is formed. Based on the induced current or electromotive force, the electromagnetic induction component 40 is capable of capturing the rotational speed and/or rotational angle of the shaft 20 to provide one or more types of input to the electronic device.
In the present embodiment, the magnetic assembly 30 includes the ring magnet 32, the ring magnet 32 is magnetized in the radial direction thereof, and the ring magnet 32 is disposed in the radial direction of the rotation shaft 20, that is, the ring magnet 32 is disposed coaxially with the rotation shaft 20, and the ring magnet 32 can be rotated by rotating the rotation shaft 20.
The electromagnetic induction assembly 40 includes a coil 41 and a C-shaped iron core 44, and since the coil 41 needs to be connected with the processor unit, the electromagnetic induction assembly 40 is fixedly connected with the housing 10, so that the coil 41 is prevented from affecting the electrical connection state during the rotation process. The C-shaped iron core 44 has a notch 441, and a portion of the ring magnet 44 is located at the notch 441, and when the ring magnet 32 rotates, the magnetic field around the coil 41 periodically changes, and the magnetic flux passing through the coil 41 changes, so that an induced electromotive force is generated in the coil 41.
Specifically, the magnetic assembly 30 further includes a support plate 31, and the support plate 31 is configured in a disc shape and is fixedly connected to the rotation shaft 20 coaxially, so that the support plate 31 rotates together with the rotation shaft 20. The ring magnet 32 is provided on the support plate 31, and the coil 41 is positioned in a magnetic field formed by the ring magnet 32, and when the rotating shaft 20 is rotated, the plurality of magnets are rotated together with the support plate 31, the magnetic field around the coil 41 is periodically changed, and a magnetic flux passing through the coil 41 is changed, so that an induced electromotive force is generated in the coil 41.
As shown in fig. 5, the electromagnetic induction assembly 40 further includes an upper cover 42, a lower cover 43, and a flexible circuit board 45, wherein the upper cover 42 and the lower cover 43 enclose a housing cavity, the coil 41 is wound on a C-shaped iron core 44, and the two are housed together in the housing cavity. The lower cover 43 and the flexible circuit board 45 are fixed in the housing 10, and the C-shaped iron core 44 is fixedly connected to the lower cover 43. The upper cover 42 and the lower cover 43 may be made of a magnetic shielding material, such as commercially available magnetic shielding material SPC series products, which are steel materials. Wherein the first english letter in the english abbreviation SPC represents a material, i.e., S (english full name: steel) represents a Steel material; the second SPC English letter indicates shape type usage, namely P (full English name: plate) indicates Plate; the third letter indicates the type of steel, i.e., C (English full name: cold) indicates Cold rolling. The SPC series products comprise SPCE, SPCD and other different brands, wherein the fourth English letter represents the stamping grade, such as E (English: drawing) represents the deep stamping grade; and D (english: deep draw) represents a deep drawing stage.
The coil 41 is placed in the accommodating cavity, so that the interference of an external magnetic field can be avoided, the coil 41 is wound on the C-shaped iron core 44, and the C-shaped iron core 44 is arranged at a position close to the annular magnet 32, so that magnetic induction wires penetrating through the coil 41 are dense, and the magnetic field change of the magnet can be accurately picked up. The flexible circuit board 45 is further provided with a processor unit, and the processor unit and the coil 41 are closed to form a loop, so that the processor unit can collect the induction current generated by the coil 41.
The C-shaped iron core 44 in the present embodiment is configured as a C-shape, a notch 441 is provided at one side of the C-shaped iron core 44, the coil 41 includes a first coil 411 and a second coil 412 connected in series, and the first coil 411 and the second coil 412 are respectively wound on two sides of the C-shaped iron core 44, so that induced currents are generated in the first coil 411 and the second coil 412, and the detection accuracy of the processor unit is improved. Openings are provided in the upper cover 42 and the lower cover 43 corresponding to the notches 441.
As shown in fig. 3 and 4, a plurality of magnets are arranged side by side on the support plate 31 to form a ring-shaped magnet 32, and the magnetic pole direction of each of the magnets is arranged in the radial direction of the support plate 31, that is, the magnetizing direction of the ring-shaped magnet 32 is magnetized in the radial direction of the support plate 31. The support disc 31 is coaxially arranged with the rotating shaft 20, a part of the ring-shaped magnet 32 is positioned at the notch 441 of the C-shaped iron core 44, and when the rotating shaft 20 is rotated, a part of the magnetic ring 32 is always positioned at the notch 441, that is, when the ring-shaped magnet 32 is rotated, the part always passes through the notch 441. Because the annular magnet 32 and the C-shaped iron core 44 are in clearance, the annular magnet 32 and the C-shaped iron core 44 are not in direct contact, the requirements on machining precision and assembly precision are low, the production difficulty is reduced, the product yield is improved, and the production cost is reduced.
In this embodiment, the poles of adjacent magnets are oppositely disposed, that is, the NS poles of adjacent magnets are oppositely disposed, and when the ring magnet 32 rotates, the direction and magnitude of the magnetic flux passing through the coil 41 are alternately changed, so that the coil 41 generates a periodically changing induced current, and the processor unit obtains the rotation speed and/or angle of the spindle 20 according to the periodically changing current, thereby obtaining one or more input signals. The ring magnet 32 of this construction enables a larger current to be generated by the coil 41, facilitating a more accurate rotational speed or angle value to be obtained by the processor unit. Preferably, the ring magnet 32 may be formed on the surface of the support plate 31 by printing or coating.
In some embodiments, the poles of adjacent magnets are the same, i.e. the NS poles of adjacent magnets are the same, and the magnetic field strengths of adjacent magnets are different, the magnitude of the magnetic flux passing through the coil 41 is alternately changed, so that the coil 41 generates a periodically varying induced current, and the processor unit obtains the rotational speed and/or angle of the shaft 20 according to the periodically varying current, thereby obtaining one or more input signals. The ring magnet 32 with the structure has lower processing difficulty and is convenient to produce and manufacture.
The electronic crown module of the present invention drives the ring magnet 32 to rotate through the rotation shaft, so that the magnetic flux passing through the coil 41 keeps varying, and the coil 41 generates electromotive force. Since the coil 41 and the processor unit on the flexible circuit board 45 form a loop, the electromotive force drives electrons to flow, and a periodic current is generated in the coil 41, so that the processor unit obtains the rotation speed and/or angle of the rotating shaft 20 according to the current, and further obtains one or more input signals, which can be used for controlling the switching or selection of the screen display information, for example, by rotating the rotating shaft 20, pages can be scrolled on the screen of the smart watch or different application programs can be selected.
As shown in fig. 3, the rotating shaft 20 is arranged on the casing 10 in a penetrating manner, one end of the rotating shaft 20 is positioned at the outer side of the casing 10, a cap 21 is arranged at the end part of the side, an annular fixing piece 22 is sleeved on the rotating shaft 20, a conductive sheet 11 is embedded on the inner side surface of the casing 10, the fixing piece 22 is contacted with the conductive sheet 11, and the conductive sheet 11 is connected with the processor unit on the flexible circuit board 45. The cap 21, the rotation shaft 20, the fixing piece 22 and the conductive piece 11 are all made of conductive metal materials, thereby achieving the electrical connection of the cap 21 and the processor unit.
In some embodiments, the cap 21 may be used as a tactile switch, for example, by touching the cap 21 with a user's finger, waking up the lighting control screen, and then turning the cap 21 to make a selection of an application program, thereby avoiding operating the device when another object turns the cap 21, and avoiding the problem of misoperations. That is, the cap 21 can be turned to operate the device only after the user's finger has established an electrical connection with the processor unit.
In some embodiments, the cap 21 may be used as an electrode for collecting electrical parameters of the user's body, e.g. the smart wearable device may comprise a first user contact position and the cap 21 forms a second user contact position when touched by the user, both contact positions may generate an electrical path between the user and the device allowing the processor unit of the device to sense electrical parameters of the user, e.g. heart rate, electrical activity of the heart such as an electrocardiogram, etc.
As shown in fig. 2 and 3, the other end of the rotating shaft 20 is located in the housing 10, and the rotating shaft 20 can move along the axial direction thereof, and the housing 10 is internally provided with the key 12, and the key 12 is fixed on the inner side wall of the housing 10 and located in the axial direction of the rotating shaft 20. By the axial movement of the shaft 20, the other end of the shaft 20 can trigger the key 12.
Pressing cap 21 not only can follow the trigger of axial displacement pivot 20 realization to button 12, can also produce magnetic field change information through rotating cap 21 to through the signal that coil 41 output was transformed according to the magnetic field change information received, different output signals can be used for controlling equipment screen display information's switching or selection, compare in touch-sensitive screen's setting method, the function integration degree of this particular embodiment provided electronic watch crown improves, and the use is more convenient.
Further, the rotating shaft 20 is provided with an elastic element 23, specifically, the elastic element 23 is a spring sleeved on the outer side of the rotating shaft 20, one end of the spring is abutted with the housing 10, and the other end of the spring is abutted with the rotating shaft 20. In the direction shown in the figure, after the user presses the cap 21 to drive the rotating shaft 20 to move to the right to trigger the key 12, the elastic element 23 drives the rotating shaft 20 to move to the left to release the triggering of the key 12, that is, the elastic element 23 drives the rotating shaft 20 to be separated from the key 12, so as to provide the power for resetting the rotating shaft 20. At this time, the fixing piece 22 contacts with the conductive piece 11 on the housing 10, and the fixing piece 22 can prevent the rotating shaft 20 from moving to the left, so as to limit the axial movement of the rotating shaft 20.
The invention also discloses electronic equipment comprising the electronic watch crown module, and the electronic watch crown module is connected to the side wall of the electronic equipment shell.
In some embodiments, the user may operate the electronic device by pressing or rotating the cap 21 of the electronic crown module.
It should be understood that the foregoing examples of the present invention are provided merely for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention, and that various other changes and modifications may be made therein by one skilled in the art without departing from the spirit and scope of the present invention as defined by the appended claims.
Claims (10)
1. An electronic timepiece crown module, characterized by comprising: the electromagnetic induction device comprises a shell, a rotating shaft, a magnetic assembly and an electromagnetic induction assembly, wherein the shell forms an accommodating space, the rotating shaft penetrates through the shell, and the magnetic assembly and the electromagnetic induction assembly are accommodated in the accommodating space;
the magnetic assembly comprises a ring-shaped magnet fixed on the rotating shaft, the ring-shaped magnet is magnetized along the radial direction of the ring-shaped magnet, and the ring-shaped magnet and the rotating shaft are coaxially arranged;
the electromagnetic induction assembly comprises a C-shaped iron core and a coil wound on the C-shaped iron core, wherein the C-shaped iron core is provided with a notch, a part of the annular magnet is located at the notch, so that the coil is located in a magnetic field formed by the annular magnet, when the rotating shaft rotates, the annular magnet moves relative to the coil, and the coil generates induced electromotive force so that the electromagnetic induction assembly can collect the rotating speed and/or the rotating angle of the rotating shaft.
2. The electronic crown module of claim 1, wherein the magnetic assembly further comprises a support plate fixedly connected to the shaft, the ring magnet being disposed on a surface of the support plate.
3. The electronic crown module of claim 2, wherein the electromagnetic induction assembly further comprises a flexible circuit board and an upper cover and a lower cover enclosing to form a receiving cavity, the C-shaped iron core and the coil are positioned in the receiving cavity, and the coil is connected with a processor unit on the flexible circuit board, the processor unit and the coil form a loop, so that the processor unit collects induction current signals of the coil.
4. The electronic crown module of claim 3, wherein the coil comprises a first coil and a second coil connected in series, the first coil and the second coil being wound on both sides of the C-shaped core, respectively.
5. The electronic timepiece crown module according to claim 2, wherein a plurality of magnets are arranged side by side on the support plate to form the ring-shaped magnet, the magnetic pole directions of the magnets are arranged along the radial direction of the support plate, and the magnetic poles of adjacent magnets are arranged opposite to each other.
6. The electronic timepiece crown module according to claim 2, wherein a plurality of magnets are arranged side by side on the support plate to form the ring-shaped magnet, the magnetic pole directions of the magnets are arranged along the radial direction of the support plate, the magnetic poles of adjacent magnets are the same, and the magnetic field strengths are different.
7. The electronic crown module according to claim 3, wherein a cap is provided at an end of the rotation shaft located outside the housing, a conductive sheet connected to the processor unit is embedded in an inner surface of the housing, and a fixing piece contacting with the conductive sheet is provided on the rotation shaft, so that the cap is electrically connected to the processor unit.
8. The electronic crown module according to claim 7, wherein the other end of the rotating shaft is located in the housing, and the rotating shaft can move along the axial direction of the rotating shaft, a key is provided in the housing, and the other end of the rotating shaft triggers the key by the axial movement of the rotating shaft.
9. The electronic crown module of claim 8, in which the shaft is provided with an elastic element that drives the shaft to move axially.
10. An electronic device comprising an electronic crown module as claimed in any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111591100.2A CN114509930B (en) | 2021-12-23 | 2021-12-23 | Electronic watch crown module and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111591100.2A CN114509930B (en) | 2021-12-23 | 2021-12-23 | Electronic watch crown module and electronic equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114509930A CN114509930A (en) | 2022-05-17 |
| CN114509930B true CN114509930B (en) | 2023-10-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111591100.2A Active CN114509930B (en) | 2021-12-23 | 2021-12-23 | Electronic watch crown module and electronic equipment |
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| Country | Link |
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| CN (1) | CN114509930B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP1709453S (en) * | 2021-01-22 | 2022-03-10 | Crown for smartwatch |
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|---|---|---|---|---|
| US3657685A (en) * | 1968-02-10 | 1972-04-18 | Rafi Raimund Finsterholze Elek | Non-contacting limit switch |
| JPH06209536A (en) * | 1993-01-06 | 1994-07-26 | Toshiba Corp | Magnetic fluid shaft seal device |
| JP2013197786A (en) * | 2012-03-19 | 2013-09-30 | Casio Comput Co Ltd | Sensitivity adjustment device and radio wave communication device |
| CN103529234A (en) * | 2013-09-30 | 2014-01-22 | 江阴众和电力仪表有限公司 | Device for detecting revolution speed of nuclear-stage main pump |
| CN110198063A (en) * | 2019-06-25 | 2019-09-03 | 歌尔股份有限公司 | A kind of magnet attraction charging fixing device, wrist-watch and wrist-watch charging system |
| CN110249145A (en) * | 2016-11-17 | 2019-09-17 | 通用电气(Ge)贝克休斯有限责任公司 | Roll the thrust active magnetic bearings of control slowly for axis |
| CN213042828U (en) * | 2020-11-06 | 2021-04-23 | 歌尔科技有限公司 | Electronic equipment and electromagnetic type rotary pressing key thereof |
| CN112965362A (en) * | 2019-12-12 | 2021-06-15 | 华为技术有限公司 | Device for operating wearable equipment |
-
2021
- 2021-12-23 CN CN202111591100.2A patent/CN114509930B/en active Active
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|---|---|---|---|---|
| US3657685A (en) * | 1968-02-10 | 1972-04-18 | Rafi Raimund Finsterholze Elek | Non-contacting limit switch |
| JPH06209536A (en) * | 1993-01-06 | 1994-07-26 | Toshiba Corp | Magnetic fluid shaft seal device |
| JP2013197786A (en) * | 2012-03-19 | 2013-09-30 | Casio Comput Co Ltd | Sensitivity adjustment device and radio wave communication device |
| CN103529234A (en) * | 2013-09-30 | 2014-01-22 | 江阴众和电力仪表有限公司 | Device for detecting revolution speed of nuclear-stage main pump |
| CN110249145A (en) * | 2016-11-17 | 2019-09-17 | 通用电气(Ge)贝克休斯有限责任公司 | Roll the thrust active magnetic bearings of control slowly for axis |
| CN110198063A (en) * | 2019-06-25 | 2019-09-03 | 歌尔股份有限公司 | A kind of magnet attraction charging fixing device, wrist-watch and wrist-watch charging system |
| CN112965362A (en) * | 2019-12-12 | 2021-06-15 | 华为技术有限公司 | Device for operating wearable equipment |
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| CN114509930A (en) | 2022-05-17 |
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