阅读说明：本技术 基于磁悬浮的声音播放装置 (Sound playing device based on magnetic suspension ) 是由 杨昭 于 2019-03-05 设计创作，主要内容包括：基于磁悬浮的声音播放装置,包括录音载体、转盘、外壳、唱臂载体、唱臂和设有转盘触控笔的磁性拾音器,还包括：第一转盘侧永磁体、至少一个壳体侧永磁体和电磁校正线圈,所述第一转盘侧永磁体和至少一个壳体侧永磁体用于产生悬浮电磁力,所述电磁校正线圈用于控制所述转盘的悬浮,所述转盘通过所述悬浮电磁力悬浮于所述外壳的上方；第二转盘侧永磁体和驱动电磁线圈,所述第二转盘侧永磁体和驱动电磁线圈用于产生旋转电磁力,所述驱动电磁线圈用于控制所述转盘的旋转,所述转盘通过所述旋转电磁力旋转于所述外壳的上方。能够确保音乐媒体的旋转在转盘相对较小的质量下尽可能稳定且没有振动,使接触记录的机械部件和触控笔的磨损程度尽可能降低。(Sound play device based on magnetic suspension, including recording carrier, carousel, shell, tone arm carrier, tone arm and be equipped with the magnetism adapter of carousel touch-control pen, still include: the rotary table comprises a first rotary table side permanent magnet, at least one shell side permanent magnet and an electromagnetic correction coil, wherein the first rotary table side permanent magnet and the at least one shell side permanent magnet are used for generating suspension electromagnetic force, the electromagnetic correction coil is used for controlling the suspension of the rotary table, and the rotary table is suspended above the shell through the suspension electromagnetic force; the second turntable side permanent magnet and the driving electromagnetic coil are used for generating rotating electromagnetic force, the driving electromagnetic coil is used for controlling the rotation of the turntable, and the turntable rotates above the shell through the rotating electromagnetic force. It is ensured that the rotation of the music medium is as stable as possible and free of vibrations with a relatively small mass of the turntable, so that the degree of wear of the mechanical parts and stylus contacting the recording is reduced as much as possible.)

1. Sound play device based on magnetic suspension, including recording carrier (1), carousel (2), shell (3), tone arm carrier (4), tone arm (5) and be equipped with magnetism adapter (6) of carousel touch-control pen, its characterized in that still includes:

a first turntable-side permanent magnet (7), at least one shell-side permanent magnet (8) and an electromagnetic correction coil (9), wherein the first turntable-side permanent magnet (7) and the at least one shell-side permanent magnet (8) are used for generating levitation electromagnetic force, the electromagnetic correction coil (9) is used for controlling levitation of the turntable (2), and the turntable (2) is levitated above the shell (3) through the levitation electromagnetic force;

second carousel side permanent magnet (10) and drive solenoid (11), second carousel side permanent magnet (10) and drive solenoid (11) are used for producing rotatory electromagnetic force, drive solenoid (11) are used for controlling the rotation of carousel (2), carousel (2) pass through rotatory electromagnetic force rotate in the top of shell (3).

2. The magnetic levitation based sound playback apparatus as recited in claim 1, wherein a gap between an upper surface of the housing (3) and a lower surface of the turntable (2) is 1 to 200 mm;

the turntable (2) comprises a turntable body (201), a geometric center (203) with a metal tip (202) is formed on the upper side of the turntable body (201), the geometric center (203) is used for centering the record carrier (1), and the diameter of the turntable body (201) is equal to or larger than that of a vinyl record.

3. The magnetic levitation based sound reproducing apparatus as recited in claim 2, wherein the disc body (201) is formed with a plurality of grooves or recesses on the surface, each groove or recess is for receiving the second turntable-side permanent magnet (10), the bottom of the groove or recess is a part of the lower surface of the disc body (201), and the opening of the groove or recess is directed to the inside or the upper surface of the disc body (201), so that the second turntable-side permanent magnet (10) is invisibly fixed in the disc body (201).

4. The magnetic levitation based sound reproducing apparatus as recited in claim 3, wherein the second turntable side permanent magnets (10) are annularly distributed at the outer edge of the disc body (201), the second turntable (2) side permanent magnets are uniformly distributed along the circumferential direction of the disc body (201), the distance between two adjacent second turntable side permanent magnets (10) is 2cm to 10cm, and the number of second turntable side permanent magnets (10) is a multiple of the number of the driving electromagnetic coils (11).

5. The magnetic levitation based sound playback apparatus as recited in claim 1, wherein a shield (12) is provided at an edge of the tray body (201), the shield (12) being rigidly fixed to an upper surface of the tray body (201) and recessed into the tray body (201) over its entire thickness;

the thickness range of the shielding body (12) is 0.1-2.5 mm, the outer diameter of the shielding body (12) is smaller than the diameter of the disc body (201), and the geometric center (203) of the shielding body (12) is provided with a round hole, and the diameter of the round hole allows the metal tip (202) of the disc body (201) to pass through.

6. The magnetic levitation based sound playback device as recited in claim 1, characterized in that the turntable (2) comprises a coating (13), the coating (13) being in the shape of a circular disc, the outer diameter of the coating (13) being the same as the diameter of the turntable (2);

a plurality of reflecting surfaces (14) used for specular reflection of light are formed on the lower side of the rotary table (2), the reflecting surfaces (14) are recessed into the lower surface of the rotary table (2), the reflecting surfaces (14) are uniformly distributed in an annular shape, and the number of the reflecting surfaces (14) is equal to that of the second rotary table side permanent magnets (10);

the housing (3) is provided with a plurality of light sensors (15), the light sensors (15) being arranged to separate the light differences reflected by the reflective surface (14) and to scan the rotational speed of the turntable (2).

7. The magnetic levitation based sound playback device as recited in claim 1, characterised in that the electromagnetic correction coils (9) are evenly distributed within the ring of the housing side permanent magnets (8);

the driving electromagnetic coils (11) are provided with two groups, each group comprises three driving electromagnetic coils (11), the three driving electromagnetic coils (11) in each group are distributed on a horizontal ring at an angle of 120 degrees, the centers of the three driving electromagnetic coils (11) in each group are in an axis, and the two groups of driving electromagnetic coils (11) are offset in angle by 40-80 degrees.

8. The sound playback device based on magnetic levitation of claim 1, further comprising a support foot (17), the support foot (17) being adapted to mechanically support and deposit the turntable (2) when the sound playback device is in the rest position;

the supporting legs (17) are connected to the upper end of the shell (3), the number of the supporting legs (17) is 4, the top of each supporting leg (17) is in a cone shape with a circular cross section, and the supporting legs (17) vertically penetrate through the upper plate of the shell (3) through holes.

9. The sound playback device based on magnetic levitation according to claim 8, wherein the supporting foot (17) is connected with a servo motor (18), the servo motor (18) is located inside the housing (3), the supporting foot (17) is hidden in the housing (3) when the sound playback device is in the rest position, and the servo motor (18) drives the supporting foot (17) to be synchronously raised and extend into the hole of the turntable (2) to support the turntable (2).

10. The magnetic levitation based sound playback apparatus as recited in claim 1, further comprising a control unit (16), a lighting mechanism (21) and a control switch (22); the control unit (16) is used for controlling the power and direction change of the current of the electromagnetic coil to enable the electromagnetic correction coil (9) to generate levitation electromagnetic force and enable the driving electromagnetic coil (11) to generate rotation electromagnetic force;

the lighting mechanism (21) includes an annular lamp (20) provided in an upper surface of the housing (3);

the control switch (22) is used for switching on and off the sound playing device.

Technical Field

The embodiment of the invention relates to the technical field of sound playing, in particular to a sound playing device based on magnetic suspension.

Background

Vinyl records are popular with people of all ages because they are more acoustically perceived as authentic and less expensive. The black glue is a very original pure analog sound production mode, sound vibration ripples are continuously recorded on the surface of the black glue in a spiral shape, a stylus contacts with the black glue carved patterns, a needle rod can vibrate along with the carved patterns, the vibration drives a magnet or a coil to cut magnetic lines of force to generate weak electroacoustic signals, and the weak electroacoustic signals are amplified into hundreds or thousands of times through a pickup amplifier to form black glue music signals which can be received by a general power amplifier or an active sound box.

In order to ensure the quality of the sound played by the vinyl record, the vinyl record is rotated at a suitable and stable speed to avoid any unnecessary acceleration, deceleration and vibration as small as possible. The sound reproduction apparatus itself may generate unwanted vibrations due to quality problems of electrical and mechanical parts, and in addition, the sound reproduction apparatus may also generate vibrations under the influence of vibrations of surrounding spatial objects. For example, when walking on the floor of a room, the vinyl record may come into contact with the base, or vibrate due to sound amplification.

At the present stage, various turntable suspension systems or selection of turntable suspension materials are commercially produced to eliminate unnecessary vibrations, and a relatively heavy turntable is generally used, thereby resulting in an increase in the production cost of the playback device for the purpose of sound quality improvement. In fact, a belt drive is most often used to transmit the rotation of the drive shaft of the motor to the power shaft of the turntable, the motor being usually located under its pivoted turntable to transmit the kinetic energy of rotation to the plastic belt, since the plastic belt absorbs most of the friction and interference, reducing the interference of the motor in the low frequency range. Existing stepper motors use direct drive, however, these motors must be designed not to generate any low frequency noise on the microphone.

The turntable arm of the vinyl record player device functions to hold the pickup above the vinyl with a stylus. The stylus follows the spiral shape of the groove engraved on the recording, and the tone arm must hold the pickup above the spiral groove as accurately as possible, while rubbing and vibrating as little as possible. The ideal tone arm is in a weightless state and does not generate a force to travel in the lateral direction according to the spiral track. Its vertical tracking angle on the helical groove should be identical over its entire length, but is not generally used except for top-grade equipment due to technical obstacles and high price.

Disclosure of Invention

Therefore, the embodiment of the invention provides a magnetic suspension-based sound playing device, which can ensure that the rotation of a music medium is as stable as possible and has no vibration under the condition of relatively small quality of a turntable, and the abrasion degree of a mechanical part and a touch pen which are in contact with recording is reduced as much as possible.

In order to achieve the above object, the embodiments of the present invention provide the following technical solutions: sound play device based on magnetic suspension, including recording carrier, carousel, shell, tone arm carrier, tone arm and be equipped with the magnetism adapter of carousel touch-control pen, still include:

the rotary table comprises a first rotary table side permanent magnet, at least one shell side permanent magnet and an electromagnetic correction coil, wherein the first rotary table side permanent magnet and the at least one shell side permanent magnet are used for generating suspension electromagnetic force, the electromagnetic correction coil is used for controlling the suspension of the rotary table, and the rotary table is suspended above the shell through the suspension electromagnetic force;

the second turntable side permanent magnet and the driving electromagnetic coil are used for generating rotating electromagnetic force, the driving electromagnetic coil is used for controlling the rotation of the turntable, and the turntable rotates above the shell through the rotating electromagnetic force.

As a preferable embodiment of the magnetic levitation based sound reproducing apparatus, a gap between an upper surface of the housing and a lower surface of the turntable is 1 to 200 mm.

As a preferable aspect of the magnetic levitation based sound reproducing apparatus, the turntable includes a disk body, an upper side of the disk body forms a geometric center having a metal tip, the geometric center is used for centering the record carrier, and a diameter of the disk body is equal to or larger than a diameter of a vinyl record.

As a preferable scheme of the magnetic suspension-based sound playing apparatus, a plurality of grooves or concave holes are formed on the surface of the disk body, each groove or concave hole is used for accommodating the second turntable-side permanent magnet, the bottom of the groove or concave hole is used as a part of the lower surface of the disk body, and the opening of the groove or concave hole points to the inside or upper surface of the disk body, so that the second turntable-side permanent magnet is invisibly fixed in the disk body.

As a preferable scheme of the sound playing device based on magnetic suspension, the permanent magnets on the second turntable side are annularly distributed at the outer edge of the turntable body, the permanent magnets on the second turntable side are uniformly distributed along the circumferential direction of the turntable body, the distance between two adjacent permanent magnets on the second turntable side is 2cm to 10cm, and the number of the permanent magnets on the second turntable side is a multiple of the number of the driving electromagnetic coils.

As a preferred solution for a magnetic levitation based sound player, the disc body is provided at its edge with a shield rigidly fixed to the upper surface of the disc body and recessed in the disc body over its entire thickness.

As a preferable scheme of the magnetic suspension based sound playing device, the thickness of the shielding body ranges from 0.1 mm to 2.5mm, the outer diameter of the shielding body is smaller than the diameter of the disk body, and the geometric center of the shielding body is provided with a circular hole, and the diameter of the circular hole allows the metal tip of the disk body to pass through.

As a preferred solution of the magnetic levitation based sound reproducing apparatus, the turntable comprises a coating layer, the coating layer is in the shape of a circular disc, and the outer diameter of the coating layer is the same as the diameter of the turntable.

As a preferable scheme of the magnetic suspension based sound playing device, a plurality of reflecting surfaces for specular reflection of light are formed on the lower side of the turntable, the reflecting surfaces are recessed into the lower surface of the turntable, the reflecting surfaces are uniformly distributed in a ring shape, and the number of the reflecting surfaces is equal to that of the permanent magnets on the second turntable side.

As a preferred solution of the magnetic levitation based sound playing device, the housing is provided with a plurality of light sensors for separating the light difference reflected by the reflecting surface and scanning the rotation speed of the turntable.

As a preferred embodiment of the magnetic levitation based sound player, the electromagnetic correction coils are uniformly distributed in the ring of the housing-side permanent magnet.

As a preferred embodiment of the magnetic levitation based sound playing device, the driving solenoids are provided in two groups, each group comprising three driving solenoids, the three driving solenoids in each group being distributed on a horizontal ring at an angle of 120 degrees, the three driving solenoids in each group being centered on the axis, and the two groups of driving solenoids being angularly offset from each other by 40 to 80 degrees.

As a preferable scheme of the sound playing device based on magnetic suspension, the sound playing device further comprises supporting legs, and the supporting legs are used for mechanically supporting and depositing the turntable when the sound playing device is in a rest position. The supporting legs are connected to the upper end of the shell, the number of the supporting legs is 4, the top of each supporting leg is in a cone shape with a circular cross section, and the supporting legs vertically penetrate through the upper plate of the shell through holes.

As a preferable scheme of the sound playing device based on magnetic suspension, the supporting legs are connected with a servo motor, the servo motor is located inside the shell, the supporting legs are hidden in the shell when the sound playing device is in a static position, and the servo motor drives the supporting legs to be synchronously raised and extend into the holes of the turntable to support the turntable.

The preferable scheme of the sound playing device based on magnetic suspension also comprises a control unit, a lighting mechanism and a control switch; the control unit is used for controlling the power and direction change of the current of the electromagnetic coil to enable the electromagnetic correction coil to generate suspension electromagnetic force and enable the driving electromagnetic coil to generate rotation electromagnetic force; the illumination mechanism includes an annular light disposed in an upper surface of the housing; the control switch is used for switching on and switching off the sound playing device.

The embodiment of the invention has the following advantages: the first rotor side permanent magnet and the at least one shell side permanent magnet generate suspension electromagnetic force, the electromagnetic correction coil controls the suspension of the rotor disc, and the rotor disc is suspended above the shell through the suspension electromagnetic force; the second turntable side permanent magnet and the driving electromagnetic coil generate rotating electromagnetic force, the driving electromagnetic coil controls the rotation of the turntable, and the turntable rotates above the shell through the rotating electromagnetic force. The technical scheme of the embodiment of the invention can ensure that the rotation of the music media is as stable as possible and has no vibration under the relatively small quality of the turntable, so that the abrasion degree of mechanical parts and a touch control pen which are in contact with records is reduced as far as possible, and the sound quality of the record is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.

The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.

Fig. 1 is a schematic perspective view of a magnetic levitation based sound playing apparatus according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a magnetic levitation based sound playing apparatus provided in an embodiment of the present invention, in which a turntable is removed and supporting legs are in a contracted state;

fig. 3 is a schematic structural diagram of a magnetic levitation based sound playing apparatus provided in an embodiment of the present invention, in which a turntable is removed and supporting legs are in an extended state;

fig. 4 is a schematic front view of a magnetic suspension-based sound playing apparatus according to an embodiment of the present invention, wherein the supporting legs are in a contracted state;

fig. 5 is a schematic front view of a magnetic suspension-based sound playing apparatus according to an embodiment of the present invention, wherein the supporting feet of the magnetic suspension-based sound playing apparatus are in an extended state;

fig. 6 is a schematic bottom view of a turntable of a magnetic suspension-based sound playing apparatus according to an embodiment of the present invention;

fig. 7 is a schematic cross-sectional view of a turntable of a magnetic levitation based sound playing apparatus according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of an internal structure of a casing of a magnetic levitation based sound playing apparatus according to an embodiment of the present invention;

fig. 9 is a schematic cross-sectional view of an interior of a casing of a magnetic levitation based sound playing apparatus according to an embodiment of the present invention;

fig. 10 is a schematic view of an illumination mechanism of a magnetic suspension-based sound playing apparatus according to an embodiment of the present invention;

fig. 11 is a schematic view of playing by a magnetic levitation based sound playing apparatus according to an embodiment of the present invention;

fig. 12 is a schematic diagram illustrating an automatic stop of a playing process of a magnetic levitation based sound playing apparatus according to an embodiment of the present invention;

fig. 13 is a schematic diagram illustrating a playing process of a magnetic levitation based sound playing apparatus manually stopping according to an embodiment of the present invention;

in the figure: 1. a recording medium; 2. a turntable; 201. a tray body; 202. a metal tip; 203. a geometric center; 3. a housing; 4. a tone arm carrier; 5. a tone arm; 6. a rotary table stylus; 7. a first rotor-side permanent magnet; 8. a case-side permanent magnet; 9. an electromagnetic correction coil; 10. a second turntable side permanent magnet; 11. driving the electromagnetic coil; 12. a shield; 13. coating; 14. a reflective surface; 15. a light sensor; 16. a control unit; 17. supporting legs; 18. a servo motor; 19. a circular groove; 20. an annular lamp; 21. an illumination mechanism; 22. and controlling the switch.

Detailed Description

The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, 2, 3, 4 and 5, a magnetic levitation based sound playing apparatus is provided, which includes a record carrier 1, a turntable 2, a housing 3, a tone arm carrier 4, a tone arm 5, and a magnetic pickup 6 provided with a turntable stylus, and further includes a first turntable side permanent magnet 7, at least one housing side permanent magnet 8, and an electromagnetic correction coil 9, the first turntable side permanent magnet 7 and the at least one housing side permanent magnet 8 are used to generate levitation electromagnetic force, the electromagnetic correction coil 9 is used to control levitation of the turntable 2, and the turntable 2 is levitated above the housing 3 by the levitation electromagnetic force. A second turntable side permanent magnet 10 and a driving electromagnetic coil 11, where the second turntable side permanent magnet 10 and the driving electromagnetic coil 11 are used to generate a rotating electromagnetic force, the driving electromagnetic coil 11 is used to control the rotation of the turntable 2, and the turntable 2 rotates above the housing 3 through the rotating electromagnetic force.

Referring to fig. 4 and 5, in one embodiment of the magnetic levitation based sound reproducing apparatus, a gap between an upper surface of the housing 3 and a lower surface of the turntable 2 is 1 to 200 mm. The turntable 2 comprises a turntable body 201, the upper side of the turntable body 201 forms a geometric center 203 with a metal tip 202, the geometric center 203 is used for centering the record carrier 1, and the diameter of the turntable body 201 is equal to or larger than that of a black glue record. The surface of the disk body 201 is formed with a plurality of grooves or concave holes, each groove or concave hole is used for accommodating the second disk side permanent magnet 10, the bottom of the groove or concave hole is used as a part of the lower surface of the disk body 201, and the opening of the groove or concave hole points to the inside or upper surface of the disk body 201, so that the second disk side permanent magnet 10 is invisibly fixed in the disk body 201.

In particular, the material of the turntable 2 is preferably plastic, has a low specific gravity, can be injection molded, poured into a mold or can be simply shaped and connected in another way. A metallic tip 202 is provided at the geometric center 203 of the turntable 2 for centering the vinyl record, the metallic tip 202 having a standard size and shape to meet the centering and securing requirements of the vinyl record. Inside the turntable 2, recesses or holes for mounting permanent magnets are developed, which enable the rotation of the disk 201. The magnets are of disc-shaped design and are firmly fixed in the disc 201. Since the outer circular edge of the turntable 2 moves from the outer circular edge of the disc 201 to between 0 and 20mm, preferably 2mm, of its inner part. The wreaths of the disc permanent neodymium magnets are spread out in a ring shape at the outer edge, the distance between the disc permanent neodymium magnets is 2 to 10cm, preferably 5cm, or just the distance required for the pitch circle in the ring diameter to achieve equal distribution of the permanent magnets, and at the same time the number of magnets must be a multiple of the number of electromagnetic coils.

Depending on the polarization direction of the permanent magnets, the magnetic force of the permanent magnets is perpendicular to the disc 201, which means that each subsequent magnet in the ring is rotated 180 degrees depending on the direction of the magnetic force field orientation, or depending on the number of magnets in the ring that are not rotated. The diameter of the disc-shaped permanent magnet is between 5 and 20mm, preferably 10mm, and the height of the disc-shaped permanent magnet is between 1 and 10mm, preferably 4 mm.

Referring to fig. 6, 7 and 8, in an embodiment of the magnetic levitation based sound playing apparatus, the second turntable-side permanent magnets 10 are annularly distributed at the outer edge of the disk 201, the second turntable 2-side permanent magnets are uniformly distributed along the circumferential direction of the disk 201, the distance between two adjacent second turntable-side permanent magnets 10 is 2cm to 10cm, and the number of second turntable-side permanent magnets 10 is a multiple of the number of driving electromagnetic coils 11. The disc 201 is provided with a shield 12 at its edge, the shield 12 being rigidly fixed to the upper surface of the disc 201 and recessed in the disc 201 over its entire thickness. The thickness of the shield 12 ranges from 0.1 to 2.5mm, the outer diameter of the shield 12 is smaller than the diameter of the disc 201, and the geometric center 203 of the shield 12 has a circular hole with a diameter allowing the metal tip 202 of the disc 201 to pass through.

Specifically, the shield body 12 made of soft iron is rigidly fixed to the upper surface of the tray body 201 and recessed into the tray body 201 over the entire thickness thereof, so that the upper surface of the tray body 201 is kept uniform. The shield 12 shares a geometric center 203 with the disc 201, and the thickness of the shield 12 ranges between 0.1 and 2.5mm, preferably 0.5 mm. The outer diameter of the shield 12 is 1 to 10mm, preferably 3mm, smaller than the diameter of the disc 201, so that when the shield 12 is recessed into the disc 201, the edges are not visible and at the same time protected from corrosion. At its geometric center 203, the shield 12 has a circular hole of diameter, allowing the metal tip 202 to pass through. The shield body 12 serves to prevent the magnetic force of the permanent magnet from penetrating upward, in which the electromagnetic pickup is located during operation. The perpendicular distance of the shield 12 and the permanent magnet is between 2 and 50mm, preferably between 10mm, because by increasing the distance between the iron and the permanent magnet the efficiency of the transition of the magnetic field of the neutralizing permanent magnet through the iron is greater.

Referring to fig. 7, in an embodiment of the magnetic levitation based sound player, the turntable 2 comprises a coating 13, the coating 13 is in the shape of a circular disc, and the outer diameter of the coating 13 is the same as the diameter of the turntable 2. The lower side of the turntable 2 is formed with a plurality of reflecting surfaces 14 for specular reflection of light, the reflecting surfaces 14 are recessed into the lower surface of the turntable 2, the reflecting surfaces 14 are uniformly distributed in a ring shape, and the number of the reflecting surfaces 14 is equal to the number of the second turntable-side permanent magnets 10. The housing 3 is provided with a number of light sensors 15, the light sensors 15 being arranged to separate the differences in light reflected by the reflecting surface 14 and to scan the rotational speed of the turntable 2. The electromagnetic correction coils 9 are evenly distributed within the ring of the housing-side permanent magnet 8. The drive solenoids 11 are provided in two groups, each group including three drive solenoids 11, the three drive solenoids 11 in each group being distributed on a horizontal ring at an angle of 120 degrees, the centers of the three drive solenoids 11 in each group being in the axis, and the two groups of drive solenoids 11 being angularly offset by 40 to 80 degrees.

Specifically, the reflection surface 14 and the turntable 2 have different light reflectances, and the reflection surface 14 is used for the optical sensor 15 to accurately separate the difference in light reflection. One or more photosensors 15, preferably two, scan the rotational speed of the disc by reflection from the reflective surface 14 and provide this information to the control unit 16 so that it can adjust the direction and speed of change appropriately, the electromagnetic field strength generated by the electromagnetic coil in the housing 3, the magnetic force of which passes through the permanent magnets in the disc 201, so as to generate the torque required for acceleration, maintaining a constant speed and deceleration of the rotation of the turntable 2.

The suspension of the turntable 2 is achieved by a permanent neodymium magnet in the shape of a uniform magnetic circular plate, whose center is located at the geometric center 203 of the disk 201. The inner diameter of the circular plate is between 2 and 8cm, preferably 4cm, and the cross-section of the magnet is preferably 10 mm. The magnet is mounted in the center of the thickness of the disc 201 and is therefore mechanically fixed and hidden from view. Its magnetic force travels in a direction perpendicular to the surface of the disk 201 and the magnetic field is reflected downward. Therefore, magnetic reflection occurs between the magnetic reflections. The correction solenoid is responsible for balancing and centering the position of the turntable 2.

Referring to fig. 3 and 4, in one embodiment of the magnetic levitation based sound reproducing apparatus, the apparatus further comprises supporting legs 17, the supporting legs 17 are used for mechanically supporting and depositing the turntable 2 when the sound reproducing apparatus is in the rest position. The supporting feet 17 are connected to the upper end of the shell 3, the number of the supporting feet 17 is 4, the top of each supporting foot 17 is in a cone shape with a circular cross section, and the supporting feet 17 vertically penetrate through the upper plate of the shell 3 through holes. The supporting legs 17 are connected with a servo motor 18, the servo motor 18 is located inside the housing 3, the supporting legs 17 are hidden in the housing 3 when the sound playing device is in a rest position, and the servo motor 18 drives the supporting legs 17 to be synchronously raised and extend into the holes of the turntable 2 to support the turntable 2.

In particular, the diameter of the supporting feet 17 is between 5 and 20mm, preferably 10mm, and the height of the conical tips of the supporting feet 17 is between 1 and 10mm, preferably 3 mm. The support foot 17 with a conical tip is in its raised position resting on a circular recess 19 in the tray 201, the circular recess 19 having a width of 0.5 to 10mm, preferably less than the diameter of the support foot 17, so that the tip of the support foot 17 cannot contact the reflecting surface 14, the reflecting surface 14 being located at the bottom of the circular recess 19. There is a bevel on both outer edges of the circular groove 19. The slope is the same as the angle of the support foot 17. In this way, resting the turntable 2 on the supporting feet 17 does not cause wear and deformation of the contact surfaces, while the structure allows maximum centering of the turntable 2 in the axis. When the sound player is not in operation, the supporting feet 17 are hidden in the housing 3, so that only their conical top can be seen. The aperture of the turntable 2 is closed to prevent dust from entering the housing 3.

The supporting feet 17 are synchronously raised vertically from the housing 3 to a height above the levitation height of the turntable 2 on the magnetic pad using a servo motor 18. Before playing music, the electromagnetic mechanism for controlling the rotational centering is first opened, and then the servo motor 18 pulls the supporting feet 17 in the housing 3 through the corresponding holes. After playing the last track on the vinyl record, or before switching off the sound playing device, the servomotor 18 raises the supporting feet 17 to the upright position, thus mechanically supporting the turntable 2 and preventing the turntable 2 from falling off when the electromagnetic mechanism is deactivated. The support feet 17 are raised so that in the upright position the tray 201 is raised 1 to 20mm above the level of levitation on the magnetic pads by 3 mm. The supporting feet 17 bear the entire weight of the turntable 2 and the vinyl record during the rest position or when the sound player device is closed.

Referring to fig. 8, 9 and 10, in one embodiment of the magnetic levitation based sound playing apparatus, the apparatus further includes a control unit 16, a lighting mechanism 21 and a control switch 22; the control unit 16 is used for controlling the power and direction change of the current of the electromagnetic coil to enable the electromagnetic correction coil 9 to generate levitation electromagnetic force and enable the driving electromagnetic coil 11 to generate rotation electromagnetic force; the illumination mechanism 21 includes a ring-shaped lamp 20 provided in an upper surface of the housing 3; the control switch 22 is used to turn on and off the sound playing device.

When the sound player is switched on, the steady magnetic field of the electromagnetic correction coil 9 is automatically started. When the music carrier is properly set and the tone arm 5 is activated, the support legs 17 are automatically folded in the housing 3, and the electromagnetic coil 11 is driven to generate a rotating electromagnetic force to drive the turntable 2 to rotate.

The ring light 20 provides ambient lighting of the device during operation. The annular lamp 20 is recessed into the upper surface of the housing 3 such that the edge surface of the annular lamp 20 is flush with the surface of the housing 3. The cross-section of the annular lamp 20 is preferably rectangular, the thickness of the annular lamp 20 is 1 to 30mm, preferably 2mm, and the width of the annular lamp 20 is 5 to 40mm, preferably 11 mm. The inner diameter of the annular lamp 20 is between 100 and 350mm, preferably 230 mm. The annular lamp 20 is made of a light-transmitting material. The ring light 20 propagates vertically upward to the surface of the housing 3 in a scattered shape, visually highlighting the gap between the housing 3 and the turntable 2, and the ring light 20 can be controlled by a remote control (not shown). The sound playing device of the technical scheme of the embodiment of the invention is universal and is suitable for playing music of all known types and sizes of analog sound carriers in the form of vinyl records, can ensure that the rotation of a music medium is as stable as possible and has no vibration under the relatively small quality of the turntable 2, reduces the abrasion degree of mechanical parts and touch pens which are in contact with records as far as possible, and improves the sound quality of the record.

Referring to fig. 11 and 12, for example, the vinyl record is played by the technical solution of the embodiment of the present invention, the vinyl record is placed on the turntable with the center hole aligned with the main rotating shaft. And cleaning the vinyl record by using a special record brush, and slightly moving along the groove of the record during cleaning. The cleaning is done with a diagonal movement to the edge of the record. The vinyl record placed on the turntable is cleaned only when the turntable is placed on the supporting feet. The protective cover of the record player is taken off by directly pulling forward. Application of a downward force may cause the stylus to fall off. If the stylus has fallen off or is about to fall off, only a low volume can be output. Turning the control button clockwise from the OFF mode (9 o ' clock direction) of the control switch to the 33(33.3rpm-12 o ' clock direction) or 45(45rpm-3 o ' clock direction) mode depends on the play rotational speed appropriate for the record. The tone arm is lifted from the tone arm support and moved toward the vinyl record. The pickup above the track is placed on a black film record to be listened to. Ensure that the stylus is placed over the vinyl record to avoid damage. When the platter reaches the correct speed and stabilizes, the indicator lights on the control buttons will stop flashing and the tone arm will lower itself and the stylus will begin to drop down to contact the platter. When the tone arm reaches the end of the record, the tone arm will lift itself and the suspension disc will slowly stop rotating. And after the tone arm is lifted, the tone arm is moved back to the tone arm support. Ensuring that the tone arm is fully seated within the tone arm support rather than merely resting on it. The supporting legs will automatically rise and drag the turntable. The control switch is rotated counterclockwise to an OFF mode. Referring to fig. 13, when it is desired to manually stop playing a record, the lift arm lever is raised upwardly to move the tone arm back into the tone arm support, ensuring that the tone arm is fully seated within, and not just above, the tone arm support. The supporting legs can automatically rise and catch the rotating disc. And dropping the arm lifting rod. The control switch is rotated counterclockwise to an OFF mode.

Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.