KR790001727B1 - Turntable apparatus - Google Patents

Abstract

A direct drive for turntables of the type having a platter coupled to a shaft for rotation of the platter relative to the deck of the turntable, wherein the improvement has been made; a deckshaped armature having a plurality of insulated layers of windings thereon and concentrically arranged about the shaft and fixedly coupled to the platter, flux return means fixedly coupled to the platter between the disk-shaped amature and the platter.

Description

Turn Table Device

1 is a longitudinal sectional view showing an example of a turn table apparatus main body according to the present invention;

FIG. 2 is a reduced plan view showing the structure of the upper surface of the insulating plate in FIG.

3 is a reduced plan view showing the structure of the inner surface of the turntable shown in FIG.

4 is a connection diagram of a circuit for driving control of the turn table apparatus main body shown in FIG.

5 and 6 are reduced plan views showing another embodiment of the inner surface of the turntable of FIG.

Figure 7 is a longitudinal sectional view showing another embodiment of a turn table apparatus main body according to the present invention.

8 is a longitudinal sectional view showing yet another embodiment of a turn table device according to the present invention.

9 is a partial plan view showing another embodiment of the structure of the upper surface of the installed insulating plate of the turn table device shown in FIG.

FIG. 10 is a partial plan view showing another embodiment of the inner structure of the turn table which is the turn table device of FIG.

11 and 12 are longitudinal cross-sectional views showing an application example of a turn table device according to the present invention.

The present invention relates to a turn table device for driving a turn table in a record player.

A turn table device used in a conventional record player or the like is to rotate drive a turn table by an AC motor.

That is, the high speed rotation of the AC motor is transmitted to the turn table by a belt or an idler, and the driving is performed. This is a belt or idler that transmits the vibration generated during the high speed rotation of the AC motor to the turn table. There was a drawback that the turntable did not rotate stably and smoothly due to the transmission variation of. In addition, conventionally, the turntable axis is directly connected to the rotation axis of the motor, and the turntable is directly driven, which is not preferable because the record player or the like cannot be flat and light in weight.

The present invention has been invented in view of the above points, and an object thereof is to provide a turntable device that can be rotated stably and smoothly at a desired speed.

Another object of the present invention is to provide a round table apparatus that is flat and light in weight.

The present invention, in order to achieve the above object, the rotary table is freely rotatably supported on the fixed substrate, having the same shape on the inner surface of the rotary table, and at substantially the same distance with respect to the center of rotation, evenly spaced apart from each other. Attaching magnetic bodies alternately arranged in the opposite polarity, and placing a plurality of coils on the fixed substrate corresponding to the magnetic bodies, and the electromagnetic force between the plurality of coils and the magnet bodies attached to the inner surface of the turntable. By rotating the turntable by

The present invention will be described below by creating an embodiment of the accompanying drawings.

In Fig. 1 to Fig. 10, the same parts are denoted by the same reference numerals.

In FIG. 1, the donut-shaped insulating plate 3 is attached to the upper surface of the fixed substrate 1 on which the hub 2 and the recess 2a are formed. On the insulating plate 3, three coils S ₁ , S ₂ , and S ₃ having substantially the same shape as the second diagram are arranged at substantially the same distance with respect to the center of the hub 2 at equal intervals from each other. It is printed and arranged.

In addition, FIG. 2 is a plan view of the upper surface of the insulating plate in FIG. 1, which is reduced in size, on the above-described insulating plate 3 positioned between the three coils S ₁ , S ₂ , and S ₃ . Detectors V ₁ , V ₂ , V ₃ , for example, hall elements, position detection coils, and the like are disposed. In addition, in the recess 2a formed in the fixed substrate 1, a cylindrical bearing box 5 with a closed bottom is inserted. The turntable shaft 7 having the spindle portion 6 is arranged in a bearing 8 provided in the bearing box 5. In addition, the turn table 9 disposed to face the coils S ₁ , S ₂ , and S ₃ is supported by the turn table shaft 7 to be freely rotated. The inner surface of the turntable 9 corresponds to the three coils S ₁ , S ₂ , and S ₃ which are printed and arranged on the upper surface of the insulating plate _{3, as} shown in FIG. 3. As described above, four magnet bodies R ₁ , R ₂ , R ₃ , and R ₄ printed on the thin annular synthetic resin body 10 are alternately arranged with opposite polarities. 3 is a plan view showing the inner surface of the turning table 9 in FIG.

FIG. 4 is a circuit for driving control of the above-described apparatus. In the drawing, the anode of the DC power supply E is formed of the coils S ₁ , S ₂ , and S ₃ connected by molding through the transistor TR. The free terminals a ₁ , a ₂ , and a _{3 of} the coils S ₁ , S ₂ , and S ₃ are connected to the connection terminal a, and the transistor T ₁ ), (T ₂ ), and (T ₃ ) are connected to the negative electrode of DC power source E described above. The direct current circuit of the resistor R and the constant voltage diode DI is connected to the DC power supply E, and the position detectors V ₁ , V ₂ , and V ₃ are connected through the constant voltage diode DI. For example, a DC constant voltage is applied to a Hall element, a position detection coil, or the like. The output terminals of the position detectors V ₁ , V ₂ , and V ₃ are connected to the base terminals of the transistors T ₁ , T ₂ , and T ₃ described above. The transistors T ₁ , T ₂ , and T ₃ are conducted by the output signals of the position detectors V ₁ , V ₂ , and V ₃ , which are changed in the magnetic field according to the rotation of 9). And non-conductive, current supplied to the coils S ₁ , S ₂ , and S ₃ from the DC power source E is controlled on and off. On the other hand, the free terminals a ₁ , a ₂ , and a ₃ of the coils S ₁ , S ₂ , and S ₃ connected by molding are connected to the input terminal of the speed control circuit TSC. A speed control circuit (TSC) connected to the coil S ₁ , S ₂ , and S ₃ , which compares the reverse reference voltage proportional to the rotational speed induced in the coils S ₃ and S ₃ , is operated. The transistor TR is conductive and non-conductive, and the magnitude of the current supplied from the DC power supply E to the coils S ₁ , S ₂ , and S ₃ , that is, the rotation speed of the turn table Controlled.

In the above-described embodiment, the inner surface of the turn table 9 has almost the same shape printed on the thin annular synthetic resin 10, and alternately at opposite distances at substantially the same distance with respect to the rotation center, alternately having opposite polarities. Four magnet bodies R ₁ , R ₂ , R ₃ , and R ₄ are arranged, and instead, a magnetic powder material like powder is formed on the inner surface of the turntable 9. May be molded into a synthetic resin, and the thin annular synthetic resin molded magnets 11 which are alternately arranged in opposite polarities at substantially the same distance with respect to the rotation center may be bonded together.

In addition, as in the sixth diagram, four flat magnets W ₁ , W ₂ , W ₃ , and W ₄ having almost the same shape on the inner surface of the turntable 9 are substantially the same with respect to the rotation center. Alternatively, they may be bonded alternately in opposite polarity at equal distances from each other.

7 shows another embodiment according to the present invention. In the case where the above-described turn table device is used in an acoustic device such as a record player, the magnetic flux generated by the magnet body disposed on the inner surface of the turn table is reduced. It is to prevent the noise from increasing upward and causing acoustic noise, in particular, the magnetic field of the magnet body is strong, and the leakage magnetic flux increases. That is, in FIG. 7, the iron plate 12 is interposed between the inner surface of the turn table 9 and the magnet bodies W ₁ , W ₂ , W ₃ , and W ₄ . Most of the magnetic flux generated in ₁ ), (W ₂ ), (W ₃ ), and (W ₄ ) is prevented from leaking upward of the turntable through the iron plate 12.

8 is a view showing another embodiment of the present invention, in which a driving torque of a turn table is increased. That is, the donut-shaped heat transfer plate 3 on which the coils S ₁ , S ₂ , and S ₃ are printed are fixed to the upper portion of the hub 2 of the fixed substrate 1, thereby fixing the fixed substrate 1. Opposite in a position isolated from), wherein the turntable 9 is supported on the fixed substrate 1 so as to be freely rotatable, and the magnet body R ₁ , (R ₂ ), ( In the outer peripheral end portion 9a of the turn table 9 in which R ₃ ) and (R ₄ ) are alternately arranged with the N pole and the S pole, the annular iron plate 13 is attached to the fixed substrate 1 and the insulating plate 3. ) So that they are arranged between

Four magnet bodies N ₁ , N ₂ , N ₃ , which have almost the same shape on the annular iron plate 13 and are arranged in opposite polarities alternately at the same distance with respect to the rotation center at equal intervals. The thin annular synthetic resin body 14 on which N ₄ is printed is bonded to correspond to the coils S ₁ , S ₂ , and S ₃ arranged on the insulating plate 3.

In the above turntable device, since the magnet body is disposed on both the upper and lower sides of the coils S ₁ , S ₂ , and S ₃ , the driving torque of the turn table can be increased.

In the embodiments of FIGS. 2 and 3, three coils S ₁ , S ₂ , and S ₃ are disposed on the insulating plate 3, and 4 is provided on the inner surface of the turn table 9. Magnet bodies R ₁ , R ₂ , R ₃ , and R ₄ are arranged, and a plurality of coils B ₁ on the insulating plate 3 as shown in part in FIG. 9. ), (B ₂ ), (B ₃ ), (B ₄ ). … And a plurality of magnet bodies C ₁ , C ₂ , C ₃ , and C ₄ on the inner surface of the turntable 9 as shown in FIG. 10. do.

11 and 12 show an application example of the apparatus according to the present invention. That is, FIG. 11 shows an example in which the substrate 1 is placed and fixed on the support plate 21 with a vibration absorber 19 such as a rubber plate interposed therebetween. A recess 22 is formed at the periphery of the lower surface of the support plate 21, and an elastic member 23, such as air bellows, is inserted into the recess 22.

Repulsion between the magnet body (R ₁ ), (R ₂ ), (R ₃ ), (R ₄ ) and the coil (S ₁ ), (S ₂ ), (S ₃ ) by the vibration absorbing material 19 Absorbing force and the vibration of the substrate 1 due to the vibration (S ₁ ), (S ₂ ), (S ₃ ) itself. In addition, the thick support tube 21 and the elastic member 23 can achieve the effect of preventing the resonance of the turntable device due to the high frequency vibration of the external environment.

FIG. 12 shows the support member 21 and the elastic member 23 attached to the outer periphery of the housing 20 with the flexible member 19 placed on the lower surface of the substrate 1 in the middle. The example supported by is shown, but the upper surface becomes flat compared with FIG.

As described above, according to the present invention, a magnet body having substantially the same shape on the inner surface of the turntable and alternately arranged in opposite polarities at equal distances at substantially the same distance with respect to the center of rotation, the magnet body and the turntable Since the turbine is directly driven by the electromagnetic force between the plurality of coils disposed on the fixed substrate corresponding to the axial direction of the turntable, the turntable can be stably and smoothly rotated at a desired speed. In addition, the magnetic body and the coil can be made thin to reduce the weight, and in particular, the magnetic body, which is printed on a thin synthetic resin body, is a thin synthetic resin alternately arranged in the opposite polarity with the magnetic body alternately arranged in the opposite polarity. It is more effective in the case of using a magnet body molded into a mold and in the case of using a printed wiring coil as the coil described above.

When the above-mentioned turn table device is used in an acoustic device such as a player, when the magnetic noise generated by the magnetic body disposed on the inner surface of the turn table leaks above the turn table, the above-mentioned turn noise is a problem. By interposing the iron plate between the table and the magnet body, most of the magnetic flux generated in the magnet body passes through the iron plate and can be solved so as not to leak upward of the turn table.

Claims (1)

As described above and illustrated in the drawings, a fixed substrate, a turntable freely rotatably supported on the fixed substrate and disposed opposite to the fixed substrate, have a rotational shape almost identical to the inner surface of the turntable, and rotate. Magnet bodies arranged alternately with opposite polarities at equal distances from each other at substantially the same distance from the center, and a plurality of coils provided on the fixed substrates electrically corresponding to the magnet bodies and the above-mentioned turntable axial directions; A turntable device comprising position detecting means for detecting an electromagnetic position relative to the coil and the magnet body, and current control means operating by an output signal of the position detecting means and controlling a direct current supplied to the coil; .

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