CN115295026A - Inductive double magnetic circuit transducer for black rubber disc recorder - Google Patents

Abstract

The invention discloses a sensitive double-magnetic circuit transducer for a vinyl record recorder, which relates to the field of production and manufacture of high-fidelity vinyl records and comprises a shell, a driving mechanism and a signal feedback mechanism, wherein the driving mechanism and the signal feedback mechanism are both fixed on the shell: the driving mechanism adopts a single double-magnetic circuit design, the main magnetic circuit is responsible for the power output of the transducer, and the ultrasonic magnetic circuit is mechanically coupled with the output end of the main magnetic circuit, so that the turning capacity of the transducer on a hard substrate can be greatly improved; the signal feedback mechanism can feed back the working state of the system in real time, and provides convenience for counteracting amplitude-frequency response distortion caused by the resonant frequency of the hard suspension structure; the shell adopts a grid type penetration design, improves the air flow exchange between the driving mechanism and the outside, improves the heat dissipation capacity of the system, and realizes higher peak thrust and reliability. The invention has compact structure and excellent performance, and is suitable for wide popularization.

Description

Inductive double magnetic circuit transducer for black rubber disc recorder

Technical Field

The invention relates to the field of production and manufacture of high-fidelity vinyl records, in particular to an inductive double-magnetic-circuit transducer for a vinyl record recorder.

Background

The transducers currently used in vinyl record recorders are classified into inductive transducers and non-inductive transducers according to their structure.

The two principles are similar to those of a moving-coil loudspeaker in the field of electroacoustic, an electrified coil is subjected to ampere force in a magnetic field, and alternating current passes through the coil, so that the main shaft is driven to vibrate. However, compared with the flexible suspension edge and the centering support piece of the moving coil loudspeaker, the constraint structure of the transducer for the vinyl record recorder has extremely high equivalent mass, so that the main resonance peak is positioned in the auditory frequency band of the human ear of 1kHz-2kHz, and the negative influence is brought to high fidelity recording.

The essential difference between inductive and non-inductive transducers is whether there is a sensor to feed back the operating state of the transducer in real time.

From a higher level of recording accuracy, the inductive transducer is widely used in high-end vinyl record recording systems because it can perform negative feedback high-accuracy control in cooperation with a dedicated preamplifier.

However, the inductive transducers in the market also have certain defects, and the miniaturization design of the transducers restricts the heat dissipation capacity of the transducers, so that the transducers have poor reliability and short service life. The problem of heat accumulation of the transducer further restricts the peak thrust of the transducer, so that the transducer can only carry out cutting work on a digested cellulose paint laminate with lower hardness and cannot be applied to occasions such as direct etching of a vinyl substrate and the like.

Disclosure of Invention

The invention mainly aims to provide an inductive double-magnetic-circuit transducer for a vinyl record recorder, which can effectively solve the problems in the background technology.

In order to achieve the purpose, the invention specifically adopts the following technical scheme:

a double magnetic circuit transducer with induction for a black adhesive disc recorder comprises a shell, a driving mechanism and a signal feedback mechanism, and is characterized in that the shell is used for fixing the driving mechanism and the signal feedback mechanism and isolating a magnetic field between the driving mechanism and the signal feedback mechanism, the shell mainly comprises an upper shell and a lower shell, a lower centering support sheet used for limiting a main shaft is fixed below the lower shell, the upper part and the lower part of the lower centering support sheet are respectively fixed with an anti-thrust buckle, the anti-thrust buckle is used for enhancing the connection strength of the lower centering support sheet and the main shaft, a magnetic restraining plate is fixed on the upper shell and used for magnetic shielding, a flange plate is fixed on the magnetic restraining plate, an upper centering support sheet used for limiting the main shaft is fixed above the flange plate, the upper part and the lower part of the upper centering support sheet are respectively provided with an anti-thrust buckle, the utility of thrust button is the same with lower centering support part, actuating mechanism mainly includes main shaft, central magnet, peripheral magnet, be fixed with the fixer on the main shaft, the fixer outside is fixed with the coil support, the coil support outside has wound ultrasonic coil and main coil, central magnet top is fixed with central magnetic conduction plate, central magnet below is fixed with central magnetic conduction plate down, peripheral magnet top is fixed in peripheral magnetic conduction plate below, and peripheral magnet below is fixed in peripheral magnetic conduction plate top down, signal feedback mechanism mainly includes the tripod, the central cover of tripod has inlayed annular magnet, annular magnet top is connected with T type magnetic conduction plate, there is the slit between the lower part outside of T type magnetic conduction plate and the annular magnet inboard, be even strong magnetic field in the slit, signal feedback coil support has still been placed in the slit, and a feedback coil is wound on the outer side of the feedback coil support, and the feedback coil support is connected with the main shaft.

Furthermore, slits are respectively arranged between the inner side of the peripheral upper magnetic conduction plate and the outer side of the central upper magnetic conduction plate, and between the inner side of the peripheral lower magnetic conduction plate and the outer side of the central lower magnetic conduction plate in pairs, uniform magnetic fields are arranged in the two slits, the ultrasonic coil and the main coil wound on the outer side of the coil support are respectively arranged in the upper slit and the lower slit, the ultrasonic coil and the main coil are respectively arranged in the upper slit and the lower slit with the uniform magnetic fields, the magnetic air gap of the two magnetic circuits is 0.6mm-0.8mm, and 70% -80% of magnetic fluid is filled in the two magnetic air gaps.

Furthermore, a gap exists between the upper part of the central upper magnetic conduction plate and the lower part of the magnetic suppression plate in the upper shell, the fixer moves in the gap, and the gap between the upper part of the fixer and the lower part of the magnetic suppression plate, and the gap between the lower part of the fixer and the upper part of the central upper magnetic conduction plate are not less than 2mm.

Furthermore, eight peripheral magnets are bonded on the upper portion of the peripheral lower magnetic conduction plate and are uniformly distributed in a ring shape, the diameter of each peripheral magnet is equal to the ring diameter of the peripheral lower magnetic conduction plate, and the ring diameter of the peripheral lower magnetic conduction plate is the same as that of the peripheral upper magnetic conduction plate.

Furthermore, the lower part of the peripheral magnet is adhered to the upper part of the peripheral lower magnetic conductive plate, the upper part of the peripheral magnet is adhered to the lower part of the peripheral upper magnetic conductive plate, the lower part of the central magnet is adhered to the upper part of the central lower magnetic conductive plate, and the upper part of the central magnet is adhered to the lower part of the central upper magnetic conductive plate by magnetic conductive adhesives.

Furthermore, the upper surface of the fixer is provided with a through hole, the opening rate is more than 50%, and the single opening area is not less than 10% of the upper surface area of the fixer.

Furthermore, grid-type through holes are formed in the lateral surfaces of the upper shell and the lower shell, and the penetrating area of the grid-type through holes after the upper shell and the lower shell are combined is 50% -70% of the surface area of the combined rear side.

Further, main shaft, fixer are the carbon fiber material, coil bracket, last casing, lower casing, ring flange, tripod, feedback coil bracket, thrust are detained and are the aluminum alloy material, magnetic conduction board, peripheral magnetic conduction board, central magnetic conduction board, T type magnetic conduction board, magnetic restraining plate are the magnetic conductor down in magnetic conduction board, peripheral magnetic conduction board, the center on the periphery, feedback coil, main coil, ultrasonic coil are anaerobic copper enameled wire, go up the centering journal piece, down the centering journal piece be the spring steel material, annular magnet, central magnet, peripheral magnet are the strong magnetism of neodymium iron boron that has nickel coating.

Furthermore, the surfaces of the peripheral upper magnetic conduction plate, the peripheral lower magnetic conduction plate, the central upper magnetic conduction plate, the central lower magnetic conduction plate and the T-shaped magnetic conduction plate are all provided with composite coatings, wherein the unit mass of the silver layer is less than or equal to 2.4g/dm < 2 > -3.2g/dm < 2 >.

Furthermore, the coverage area of the magnetic suppression plate is 100% -120% of the upper surface area of the magnetic conduction plate on the periphery, and after the magnetic leakage on the upper part of the transducer is not more than 10^ (-3) T (10 Gs).

Furthermore, the flange plate is provided with 6 blind hole threads, the depth, the aperture, the thread pitch and the like of the blind hole threads are equal, and the blind hole threads are annularly and uniformly distributed on the upper part of the flange plate.

Furthermore, the fixator, the central upper magnetic conduction plate, the central magnet and the central lower magnetic conduction plate are all hollow cylinders and are coaxially arranged, and the diameters of the central upper magnetic conduction plate, the central magnet and the central lower magnetic conduction plate are equal.

Furthermore, the inner diameters of the central through holes of the T-shaped magnetic conduction plate, the magnetic suppression plate, the central upper magnetic conduction plate, the central magnet, the central lower magnetic conduction plate and the lower shell are 5% -10% larger than the outer diameter of the main shaft.

Furthermore, the peripheral lower magnetic conduction plate and the central lower magnetic conduction plate are respectively bonded with the lower shell, the peripheral upper magnetic conduction plate is bonded with the upper shell, the top surface of the lower shell is bonded with the bottom surface of the upper shell, and the central through holes of the fixator, the thrust buckle, the feedback coil bracket, the upper centering support piece and the lower centering support piece are bonded with the spindle.

Furthermore, a central through hole is formed in the lower portion of the feedback coil support, and the central through holes of the fixator, the thrust buckle, the feedback coil support, the upper centering support piece and the lower centering support piece are in over-fit with the spindle.

Furthermore, the upper shell and the upper part of the peripheral upper magnetic conduction plate, the lower shell and the lower part of the peripheral lower magnetic conduction plate, and the lower shell and the lower part of the central lower magnetic conduction plate are bonded by using a heat-conducting adhesive, so that the thermal contact resistance is reduced.

Compared with the related art, the inductive double-magnetic-circuit transducer for the vinyl record recorder provided by the invention has the following beneficial effects:

1. the invention adopts inductive design, can be matched with a preamplifier with a negative feedback circuit to control the transducer, uses a signal feedback mechanism to sense the working state of a main shaft and generate an alternating electric signal, the signal is fed back to the preamplifier to execute negative feedback conversion so as to compensate the uneven amplitude-frequency response of the transducer, thereby realizing the aim of linear response of the transducer, slightly reducing the amplitude-frequency response characteristics of low-frequency bands and part of high-frequency irregular parts, solving the problem by a simple external passive equalization network or reverse RIAA equalization and greatly improving the distortion index of the transducer.

2. The invention adopts a single double-magnetic-circuit design, the main coil is connected with the main shaft and is responsible for the conversion output of the burning signals, the ultrasonic coil is mechanically coupled with the main coil, and a 28KHz sine ultrasonic signal is added into the output signals, thereby greatly improving the turning capability of the ultrasonic transducer on a hard surface substrate, reducing the load of the main coil, relieving the heat of the main coil and effectively prolonging the service life of the transducer.

3. The invention adopts the magnetic conduction plate with the silver composite coating, can reduce the skin effect loss and the magnetic flux modulation heating caused by the alternating current eddy current in the iron-based magnetic conductor material, and combines the air gap magnetic fluid filling and the grid type penetration through hole, thereby obviously improving the heat dissipation capability of the transducer and realizing higher peak thrust and reliability under the same input power.

Drawings

FIG. 1 is a 45 degree isometric view of an inventive transducer

FIG. 2 is a full sectional view of the transducer of the invention

FIG. 3 is an axial exploded view of the transducer of the invention

FIG. 4 is an axial exploded view of the signal feedback mechanism of the invention

FIG. 5 is a partial cross-sectional view of the drive mechanism of the invention

FIG. 6 is an axial exploded view of the housing of the invention

In the figure: 1. a main shaft; 2. a T-shaped magnetic conductive plate; 3. a ring magnet; 4. a tripod; 5. a feedback coil; 6. a feedback coil support; 7. a thrust button; 8. an upper centering branch sheet; 9. a flange plate; 10. a magnetic suppression plate; 11. an upper housing; 12. a lower housing; 13. a holder; 14. the periphery is provided with a magnetic conduction plate; 15. a peripheral magnet; 16. a peripheral lower magnetic conductive plate; 17. a central upper magnetic conductive plate; 18. a central magnet; 19. a central lower flux plate; 20. a coil support; 21. an ultrasonic coil; 22. a main coil; 23. a lower centering branch; 24. a drive mechanism; 25. a signal feedback mechanism; 26. a housing.

Detailed Description

In order to make the technical means, the creation characteristics and the utility purpose of the invention easy to understand, the following will be made a complete description of the specific embodiments of the invention with the accompanying drawings.

It should be noted that like numerals represent like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the embodiments of the present invention, it should be noted that the terms "inside", "outside", "upper", "lower", "center", "periphery", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

Embodiment one, as shown in fig. 1-6, a sensitive dual magnetic circuit transducer for a vinyl disc recorder comprises a housing 26, a driving mechanism 24 and a signal feedback mechanism 25, the housing 26 is used for fixing the driving mechanism 24 and the signal feedback mechanism 25 and for magnetic field isolation between the driving mechanism 24 and the signal feedback mechanism 25 as shown in fig. 6, the housing mainly comprises an upper shell 11 and a lower shell 12, a lower centering support sheet 23 for limiting a spindle 1 is fixed below the lower shell 12 by using three screws, a thrust button 7 is respectively bonded on the upper part and the lower part of the lower centering support sheet 23 for enhancing the connection strength between the lower centering support sheet 23 and the spindle 1, a magnetic suppressing plate 10 is bonded on the upper shell 11 for magnetic shielding, a flange 9 is bonded on the magnetic suppressing plate 10, an upper centering support sheet 8 for limiting the spindle 1 is fixed above the flange 9 by using three screws, the upper part and the lower part of the upper centering branch 8 are respectively provided with a thrust button 7, the effect is the same as that of the lower centering branch 23, the driving mechanism 24 is shown in figure 5 and is a core transduction mechanism of the transducer and mainly comprises a main shaft 1, a central magnet 18 and a peripheral magnet 15, a fixer 13 is bonded on the main shaft 1, a coil bracket 20 is bonded on the outer side of the fixer 13, an ultrasonic coil 21 and a main coil 22 are wound on the outer side of the coil bracket 20, a central upper magnetic conduction plate 17 is bonded above the central magnet 18, a central lower magnetic conduction plate 19 is bonded below the central magnet 18, a peripheral magnet 15 is bonded above the peripheral magnet 14, a peripheral magnet 15 is bonded below the peripheral magnet 16, a signal feedback mechanism 25 is shown in figure 4 and is used for collecting amplitude-frequency response information of the driving mechanism and mainly comprises a tripod 4, a ring-shaped magnet 3 is bonded and embedded in the center of the tripod 4, the upper part of the annular magnet 3 is connected with the T-shaped magnetic conduction plate 2 through a magnetic conduction adhesive, a slit is arranged between the outer side of the lower part of the T-shaped magnetic conduction plate 2 and the inner side of the annular magnet 3, a uniform magnetic field is arranged in the slit, a feedback coil support 6 is also arranged in the slit, a feedback coil 5 is wound on the outer side of the feedback coil support 6, and the feedback coil support 6 is bonded with the main shaft 1.

Preferably, the top surface of the lower case 12 and the bottom surface of the upper case 11 are bonded using a strong adhesive.

Preferably, the flange 9 is provided with 6 blind hole threads, the depth, the aperture, the thread pitch and the like of the blind hole threads are equal, and the blind hole threads are uniformly distributed on the upper part of the flange 9 in an annular manner, wherein three blind hole threads are used for fixing the tripod 4 of the feedback mechanism.

Preferably, two slits are respectively formed between the inner side of the peripheral upper magnetic conductive plate 14 and the outer side of the central upper magnetic conductive plate 17, and between the inner side of the peripheral lower magnetic conductive plate 16 and the outer side of the central lower magnetic conductive plate 19, and a uniform magnetic field is formed in the two slits, the ultrasonic coil 21 and the main coil 22 wound on the outer side of the coil support are respectively arranged in the upper slit and the lower slit, and the principle that the coils are subjected to ampere force in the magnetic field is utilized to drive the main shaft 1 to move.

Preferably, the ultrasonic coil 21 and the main coil 22 are respectively disposed in an upper slit and a lower slit having uniform magnetic fields, and the magnetic air gap of the two magnetic circuits is 0.6mm-0.8mm.

Preferably, 70% -80% of magnetic fluid is filled in each of the two magnetic air gaps, so that the bearing power and the heat dissipation capacity of the transducer can be remarkably improved.

Preferably, the peripheral lower magnetic conductive plate 16 and the central lower magnetic conductive plate 19 are respectively bonded to the lower case 12, and the peripheral upper magnetic conductive plate 14 is bonded to the upper case 11, it should be noted that the central upper magnetic conductive plate 17 is not bonded to the upper case 11, a gap exists between the upper portion of the central upper magnetic conductive plate 17 and the lower portion of the magnetic suppressing plate 10 in the upper case 11, the holder moves in the gap, and the gap between the upper portion of the holder 13 and the lower portion of the magnetic suppressing plate 10, and the gap between the lower portion of the holder 13 and the upper portion of the central upper magnetic conductive plate 17 should be not less than 2mm.

Preferably, the upper shell 11 and the upper portion of the peripheral upper magnetic conduction plate 14, the lower shell 12 and the lower portion 16 of the peripheral lower magnetic conduction plate, and the lower shell 12 and the lower portion of the central lower magnetic conduction plate 19 are bonded by using a heat-conducting adhesive, so as to reduce the contact thermal resistance.

Preferably, the lower part of the feedback coil support 6 has a through hole, the through hole is in over fit with the spindle 1, and is bonded with the spindle 1 by using an adhesive, and the purpose of the assembly mode is as follows: when the driving mechanism drives the main shaft 1 to move, the feedback coil 5 on the feedback coil bracket 6 is driven to move in a uniform magnetic field in a slit between the outer side of the lower part of the T-shaped magnetic conduction plate 2 and the inner side of the annular magnet 3, and amplitude-frequency response information of the driving mechanism is acquired by utilizing the principle of cutting magnetic induction lines.

Preferably, eight peripheral magnets 15 are bonded to the upper portion of the peripheral lower magnetic conductive plate 16 and are uniformly distributed in a ring shape, the diameter of the peripheral magnets should be equal to the ring diameter of the peripheral lower magnetic conductive plate, and the ring diameter of the peripheral lower magnetic conductive plate is the same as that of the peripheral upper magnetic conductive plate.

Preferably, the lower part of the peripheral magnet 15 and the upper part of the peripheral lower magnetic conductive plate 16, the upper part of the peripheral magnet 15 and the lower part of the peripheral upper magnetic conductive plate 14, the lower part of the central magnet 18 and the upper part of the central lower magnetic conductive plate 19, and the upper part of the central magnet 18 and the lower part of the central upper magnetic conductive plate 17 are bonded by using magnetic conductive adhesives, so that compared with the common adhesives, the magnetic conductivity of the bonded part is greatly improved.

Preferably, the holder 13, the central upper magnetic conductive plate 17, the central magnet 18, and the central lower magnetic conductive plate 19 are all hollow cylinders and are coaxially arranged, and the diameters of the central upper magnetic conductive plate 17, the central magnet 18, and the central lower magnetic conductive plate 19 are equal.

Preferably, the central through holes of the fixer 13, the thrust button 7, the feedback coil bracket 6, the upper centering branch piece 8 and the lower centering branch piece 23 are in over fit with the spindle 1 and are bonded by using a strong adhesive.

Preferably, the inner diameter of the central through hole of the T-shaped magnetic conduction plate 2, the magnetic suppression plate 10, the central upper magnetic conduction plate 17, the central magnet 18, the central lower magnetic conduction plate 19, and the lower housing 12 should be 5% -10% larger than the outer diameter of the main shaft.

Preferably, the upper surface of the fixer 13 is provided with a through hole, the aperture ratio is greater than 50%, the single aperture area should be not less than 10% of the upper surface area of the fixer 13, so as to improve the heat dissipation capability of the machine body, the through hole also has the function of adjusting the pressure of the inner cavity and the outer cavity in the system, and the too low aperture ratio can cause the pressure in the cavity to be unable to be released quickly, thereby affecting the performance of the transducer.

Preferably, grid-shaped through holes are formed in the side surfaces of the upper shell 11 and the lower shell 12, and the penetration area of the grid-shaped through holes after the upper shell and the lower shell are combined is 50% -70% of the surface area of the combined rear side, so that internal and external airflow exchange is enhanced, the heat dissipation efficiency is improved, and heat accumulation of a magnetic circuit is avoided.

Preferably, the spindle 1 and the holder 13 are made of carbon fiber to reduce the overall quality of the displacement mechanism, the coil holder 20, the upper housing 11, the lower housing 12, the flange 9, the tripod 4, the feedback coil holder 6, and the thrust button 7 are made of aluminum alloy, the peripheral upper magnetic conductive plate 14, the peripheral lower magnetic conductive plate 16, the central upper magnetic conductive plate 17, the central lower magnetic conductive plate 19, the T-shaped magnetic conductive plate 2, and the magnetic suppressing plate 10 are made of magnetic conductors, the feedback coil 5, the main coil 22, and the ultrasonic coil 21 are made of oxygen-free copper enameled wires, the upper centering support 8 and the lower centering support 23 are made of spring steel, and the ring magnet 3, the central magnet 18, and the peripheral magnet 15 are made of neodymium iron boron strong magnet with nickel plating.

Preferably, the surfaces of the peripheral upper magnetic conduction plate 14, the peripheral lower magnetic conduction plate 16, the central upper magnetic conduction plate 17, the central lower magnetic conduction plate 19 and the T-shaped magnetic conduction plate 2 are all provided with composite coatings, wherein the unit mass of a silver layer is less than or equal to 2.4g/dm < 2 > -3.2g/dm < 2 >, and the addition of the silver layer can greatly reduce skin effect loss and magnetic flux modulation heating caused by alternating current eddy currents in the magnetic conduction plates and reduce nonlinear distortion.

Preferably, the coverage area of the magnetism suppressing plate 10 is 100% -120% of the upper surface area of the peripheral upper magnetic conducting plate 14, and after the coverage, the magnetic leakage on the upper part of the transducer is less than or equal to 10 < -3 > T (10 Gs).

The working principle is as follows: when in use, the invention needs to be loaded into a head module of a vinyl record recorder, wherein the extension end of the main shaft 1 is connected with a waveguide rod in the head module to be responsible for the output of mechanical vibration and drive the vinyl record recorder to record. Then, the tap lead of the main coil 22 is connected to the signal output terminal of the power amplifier dedicated for the vinyl disc recorder, the tap lead of the feedback coil 5 is connected to the feedback signal input terminal of the preamplifier dedicated for the vinyl disc recorder, and the tap lead of the ultrasonic coil 21 is connected to the ultrasonic generator dedicated for the vinyl disc recorder. When recording is started, an audio signal is input to a tap of the main coil 22, and because the main coil 22 is located in a uniform magnetic field formed by the peripheral magnet 15, the peripheral lower magnetic conductive plate 16, the central magnet 18 and the central lower magnetic conductive plate 19, and the main coil 22 is connected with the main shaft 1 through the coil support 20 and the fixer 13, the electrified main coil 22 is stressed in the magnetic field to drive the main shaft 1 to vibrate. Meanwhile, an ultrasonic signal is input to a tap of the ultrasonic coil 21, and because the ultrasonic coil 21 is positioned in a uniform strong magnetic field formed by the peripheral magnet 15, the peripheral upper magnetic conduction plate 14, the central magnet 18 and the central upper magnetic conduction plate 17, and the ultrasonic coil 21 is also connected with the spindle 1 through the coil bracket 20 and the fixer 13, the electrified ultrasonic coil 21 is stressed in the magnetic field to vibrate, and the electrified ultrasonic coil 21 and the vibration of the main coil are synthesized and interfered to drive the spindle 1 to vibrate together. The ultrasonic waves can be superposed in the original audio signals, the recording resistance of the transducer is reduced by utilizing the ultrasonic waves, and the performance of the transducer is obviously improved; the main coil 22 and the ultrasonic coil 21 are respectively arranged in the two sets of magnetic circuits, so that the heat dissipation capacity of the machine body can be effectively improved, and meanwhile, the two sets of signal transmission wires can be respectively used for reducing interference. In the recording process, the feedback coil 5 is positioned in a magnetic field formed by the T-shaped magnetic conduction plate 2 and the annular magnet 3 and is fixed on the main shaft 1 through the feedback coil bracket 6, so that the feedback coil 5 can vibrate along with the main shaft 1 to vertically cut a magnetic induction line, induced electromotive force can be generated at two ends of the feedback coil 5, and the induced electromotive force is input to a feedback signal input terminal of a preamplifier special for the vinyl record through a tap lead of the feedback coil 5, and the effect of feeding back the working state of the main shaft 1 is achieved.

It is worth to say that, when the invention is applied to the occasion of the black rubber record, the invention can be provided with at most three groups of leads which are used as the main driving signal input, the ultrasonic driving signal input and the feedback signal output, wherein the main driving signal input lead and the ultrasonic driving signal input lead are respectively the taps of the main coil and the ultrasonic coil, the main driving signal input lead and the ultrasonic driving signal input lead are both led out to the outside of the machine body through the gap between 8 peripheral magnets, and the feedback signal output lead is the tap of the feedback coil and is led out to the outside of the machine body through the space at the lower part of the tripod.

An ideal steady state operating characteristic of the embodiment is illustrated assuming the main drive signal input lead is loaded with a standard sine wave signal at 1000 Hz. For convenience of illustration, only one oscillation period of the main driving signal is intercepted, and one period is simply represented as five time points: 0 μ s, 250 μ s, 500 μ s, 750 μ s, and 1000 μ s, wherein 250 μ s is the highest point of the positive half cycle, and 750 μ s is the lowest point of the negative half cycle. At 0 mus, the suspension is in the initial position, which is the same as the static equilibrium position of the suspension. At 250 mu s, the suspension system moves upwards to the highest point, and the upper centering support piece and the lower centering support piece have the function of preventing the suspension system from deviating from the axis. At 500 mus, the suspension system recovers the original position, which is the same as the static equilibrium position of the suspension system. At 750 mus, the suspension system moves downwards to the lowest point, and the upper centering disk and the lower centering disk are used for preventing the suspension system from deviating from the axis. At 1000 mus, the suspension system recovers the original position, which is the same as the statically balanced position of the suspension system. The output signal of the feedback coil tapped in the ideal steady state operation described above should be a standard sine wave signal at 1000 Hz. If the ultrasonic signal input lead is loaded with ultrasonic waves in the ideal steady-state operation, the output signal of the feedback coil should be the result of mutual interference of the ultrasonic signal and the 1000Hz standard sine wave signal. In particular, in practical applications, the influence of factors such as radial joint vibration, a suspension system support compliance control region, a magnetic fluid mechanical resistance control region, body resonance and the like on the performance of the transducer needs to be considered, and the above description is only intended to better describe the specific implementation mode of the embodiment.

Having thus described the general principles of the invention, its principal features and advantages, it will be apparent that the embodiments are not exclusive and that various changes and modifications may be made therein without departing from the spirit and scope of the invention, and it is intended that all of the elements of the embodiments of the invention generally described and illustrated in the accompanying drawings may be arranged and designed in a wide variety of different configurations. Accordingly, the detailed description of the embodiments of the present invention presented above in the drawings and written description is not intended to limit the scope of the claimed invention, but is merely illustrative of selected embodiments of the invention. 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.

Claims (10)

1. A sensible double-magnetic-circuit transducer for a vinyl record recorder comprises a shell (26), a driving mechanism (24) and a signal feedback mechanism (25), and is characterized in that the shell (26) mainly comprises an upper shell (11) and a lower shell (12), a lower centering support (23) for limiting a spindle (1) is fixed below the lower shell (12), a thrust buckle (7) is respectively fixed on the upper part and the lower part of the lower centering support (23), the thrust buckle (7) is used for enhancing the connection strength of the lower centering support (23) and the spindle (1), a magnetism inhibiting plate (10) is fixed on the upper shell (11), the magnetism inhibiting plate (10) is used for magnetic shielding, a flange plate (9) is bonded on the magnetism inhibiting plate (10), an upper centering support (8) for limiting the spindle (1) is arranged above the flange plate (9), the upper portion and the lower portion of the upper centering support (8) are respectively provided with a buckle (7), the thrust buckle (7) and the lower centering support (23) are the same as the thrust support (23), the spindle (13) and the driving mechanism (13) comprises a spindle (13) and a main fixing magnet (13), the spindle (13) and a fixing mechanism (13) and a main fixing effect, an ultrasonic coil (21) and a main coil (22) are wound on the outer side of the coil support (20). Central magnet (18) top is equipped with central magnetic conduction board (17) of going up, central magnet (18) below is equipped with central magnetic conduction board (19) down, peripheral magnet (15) top is fixed on peripheral magnetic conduction board (14) of going up, and peripheral magnet (15) below is fixed on peripheral magnetic conduction board (16) down, signal feedback mechanism (25) mainly include tripod (4), the center of tripod (4) is fixed with ring magnet (3), ring magnet (3) top is connected with T type magnetic conduction board (2), there is the slit between the lower part outside of T type magnetic conduction board (2) and ring magnet (3) inboard, be even strong magnetic field in the slit, feedback coil support (6) have still been placed in the slit, feedback coil support (6) outside has been around having feedback coil (5), and feedback coil support (6) are fixed mutually with main shaft (1).

2. The transducer of claim 1, wherein a slot is formed between the inner side of the peripheral upper magnetic conductive plate (14) and the outer side of the central upper magnetic conductive plate (17), and between the inner side of the peripheral lower magnetic conductive plate (16) and the outer side of the central lower magnetic conductive plate (19), and a uniform magnetic field is formed in the two slots. The ultrasonic coil (21) and the main coil (22) wound on the outer side of the coil support are respectively arranged in the upper slit and the lower slit. The ultrasonic wave coil (21) and the main coil (22) are respectively arranged in an upper slit and a lower slit with uniform magnetic fields, the magnetic air gaps are 0.6mm-0.8mm, and 70% -80% of magnetic fluid is filled in the two magnetic air gaps.

3. The transducer of claim 1, wherein a gap exists between the upper portion of the central upper magnetic conductive plate (17) and the lower portion of the magnetic suppressing plate (10) in the upper case (11), the holder (13) is movable in the gap, and the gap between the upper portion of the holder (13) and the lower portion of the magnetic suppressing plate (10) and the gap between the lower portion of the holder (13) and the upper portion of the central upper magnetic conductive plate (17) are not less than 2mm.

4. The transducer of claim 1, wherein eight peripheral magnets (15) are bonded to the upper portion of the peripheral lower magnetic conductive plate (16) and are uniformly distributed in a ring shape, the diameter of the peripheral magnets (15) is equal to the ring diameter of the peripheral lower magnetic conductive plate (16), and the ring diameter of the peripheral lower magnetic conductive plate (16) is equal to the ring diameter of the peripheral upper magnetic conductive plate (14).

5. The transducer of claim 1, wherein the lower portion of the peripheral magnet (15) and the upper portion of the peripheral lower magnetic conductive plate (16), the upper portion of the peripheral magnet (15) and the lower portion of the peripheral upper magnetic conductive plate (14), the lower portion of the central magnet (18) and the upper portion of the central lower magnetic conductive plate (19), and the upper portion of the central magnet (18) and the lower portion of the central upper magnetic conductive plate (17) are bonded together by a magnetic conductive adhesive.

6. The transducer of claim 1, wherein the holder (13) has a through hole on the upper surface, and the open area is greater than 50% and the single open area is no less than 10% of the upper surface of the holder (13).

7. The inductive dual magnetic circuit transducer for a vinyl disc recorder as claimed in claim 1, wherein the upper and lower cases (11, 12) have grid-shaped through holes on their side surfaces, and the penetration area of the grid-shaped through holes after the upper and lower cases are combined is 50% -70% of the surface area of the combined side.

8. The inductive double-magnetic-circuit transducer for the vinyl record recorder as claimed in claim 1, wherein the spindle (1) and the holder (13) are made of carbon fiber, the coil holder (20), the upper case (11), the lower case (12), the flange (9), the tripod (4), the feedback coil holder (6) and the thrust button (7) are made of aluminum alloy, the peripheral upper magnetic conductive plate (14), the peripheral lower magnetic conductive plate (16), the central upper magnetic conductive plate (17), the central lower magnetic conductive plate (19), the T-shaped magnetic conductive plate (2) and the magnetic restraining plate (10) are made of magnetic conductors, the feedback coil (5), the main coil (22) and the ultrasonic coil (21) are made of oxygen-free copper enameled wires, the upper centering support (8) and the lower centering support (23) are made of spring steel, and the ring magnet (3), the central magnet (18) and the peripheral magnet (15) are made of neodymium iron boron strong magnetic material with nickel.

9. The transducer of claim 1, wherein the surfaces of the peripheral upper magnetic conductive plate (14), the peripheral lower magnetic conductive plate (16), the central upper magnetic conductive plate (17), the central lower magnetic conductive plate (19) and the T-shaped magnetic conductive plate (2) are coated with composite coatings, and the silver layer has a mass per unit of 2.4g/dm or less ² -3.2g/dm ² 。

10. The inductive dual magnetic circuit transducer for a vinyl record writer according to claim 1, wherein the cover area of the magnetic suppressing plate (10) is 100% -120% of the upper surface area of the peripheral upper magnetic conductive plate (14), and after covering, the magnetic leakage at the upper part of the transducer is less than or equal to 10^ (-3) T (10 Gs).

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