JPS583559A - Turntable device - Google Patents

Abstract

PURPOSE:To enable to stably and smoothly rotate a turntable at the desired speed by rotatably driving the turntable with a plurality of coils disposed on a fixed base plate and electromagnetic force between magnets provided on the inner surface of the turntable. CONSTITUTION:A doughnut-shaped insulating plate 3 is bonded onto the upper surface of a fixing base plate formed with a hub 2 and a recess 2a, and 3 coils S1-S3 of approximately equal shape are printed and disposed at equal interval to each other at approximately equal distance to the center of the hub 2 on the plate 3. Then, 3 position detectors V1-V3 are disposed between the coils S1- S3. The turntable 9 disposed oppositely to the coils S1-S3 is supported by a shaft 7, the three coils S1-S3 printed and disposed on the upper surface of the plate 3 are formed on the inner surface of the turntable, are printed on a thin annular synthetic resin 10, and four magnets R1-T4 alternately printed and magnetized in opposite polarity are disposed on the resin 10.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a turntable device for driving a turntable in, for example, a record player.

Conventionally, some turntable devices used in record players and the like rotate the turntable using an AC motor. That is, the high-speed rotation of the AC motor is transmitted to the turntable via a belt, an idler, etc., and the turntable is driven. In this case, there is a drawback that stable and smooth rotation of the turntable cannot be obtained due to irregularities in the transmission of the image during high-speed rotation of the AC motor, the belt, idler, etc. that transmit this rotation to the turntable. Conventionally, there is a device in which the turntable shaft is directly connected to the rotating shaft of a motor to directly drive the turntable. In this case, it is difficult to make record players and the like flat and lightweight, as is generally the case.

The present invention has been made in consideration of the above-mentioned circumstances, and its object is to provide a turntable device in which the turntable rotates stably and smoothly at a desired speed.

Another object of the present invention is to provide a flat and lightweight turntable device.

In order to achieve the above object, according to the present invention, a turntable is rotatably supported on a fixed substrate, and the turntable has an inner surface having substantially the same shape and at substantially the same distance from the center of rotation. A plurality of coils are arranged on the fixed substrate in a relationship corresponding to the magnetic bodies, and a plurality of coils are arranged on the fixed substrate in a relationship corresponding to the magnet bodies, and the magnet bodies are magnetized and arranged with opposite polarities at equal intervals. The turntable is rotated by electromagnetic force between the magnet bodies attached to the inner surface of the table.

The present invention will be described below with reference to embodiments shown in FIGS. 1 to 10. However, from the fa1 diagram, the first Ofl K
``Identical parts are designated by the same reference numerals at 4°.''

In FIG. 1, a hub 2 and a recess 2 are formed, and a donut-shaped insulating plate 3 is adhered to the upper surface of a fixed substrate 1 at a position separated from the hub 2. On this insulating plate 3, as shown in FIG.
．． 83 are printed and arranged at substantially equal distances from the center of the hub 2 and at equal intervals from each other. Note that FIG. 2 is a plan view showing the upper surface of the insulating plate in FIG. 1 on a reduced scale.

Moreover, these three coils s1. s2. On the insulating plate 3 located between s3, there are three position detectors v1°V2.
, Va, for example, a Hall element, a position detection coil, etc. are arranged. By the way, a bottomed cylindrical bearing box 5 is inserted into a recess 2a formed in the fixed substrate 1. and a tar/table shaft 7 having a spindle portion 6.
is mounted on a bearing 8 attached to the bearing box 5. Further, the turntable 9, which is disposed facing the coils 81, 82, and 83, is pivotally supported by the turntable shaft 7, so that it can rotate freely.

On the inner surface of this turntable 9, there is a rM on the insulating plate 3.
Corresponding to the three coils 81, 82 and 83 arranged by K printing, and as shown in FIG. The four magnet bodies R1, R2, R3, and R4 are ll1-, and FIG. 3 shows the turntable 9 in FIG.
FIG.

FIG. 4 shows a circuit for driving and controlling the device described above. First, the anode of the DC current gIE is the transistor TR.
Via Kamegata Ii! t4 nine coils 81°82.8
3 tvll type ml1141 a K” is connected to the coils 81, 82.
2. a3 are transistors Tl, 'r2. It is connected to the cathode of the DC current @g via T3. By the way, a series circuit of a resistor R and a constant voltage diode DI is connected to the DC power source E, and position detectors vl, V2 . V3 *a constant voltage is applied to, for example, a Hall element, a position detection coil, etc. Furthermore, the position detectors Vl, V2. The output terminal of V3 is connected to the transistors TI, T2 . Connected to the pace terminal of T3,
Position detection fiV1. subjected to changes in magnetic field as the turntable rotates 90 times. V2. The output signal of V3 causes transistors TI, T2 . T3 is conductive and non-conductive, and the coil 81°S2. The current supplied to S and 3 is controlled ON/OFF.

On the other hand, free terminals at, m2 . a3 is connected to the first input of the speed control circuit TSC, and the speed control circuit T8C is activated to compare the back electromotive voltage proportional to the rotational speed induced in the coil 81, 82, 83 with the set reference voltage. , the transistor Ta is made conductive and non-conductive, and the magnitude of the current supplied to the filters 81, 82, 83, ie, the rotation speed of the turntable, is controlled by the +fi current @g.

In addition, in the above-mentioned embodiment, the inner surface of the turntable 9 is printed on a thin annular synthetic resin body 10 and has approximately the same shape and is spaced at approximately the same distance from the center of rotation. Four magnets arranged with opposite polarity alternately at intervals 1,
32. R3 and R4 are arranged, but instead of this, a powdered magnetic material is molded with synthetic resin on the inner surface of the turntable 9 as shown in Figure 5, and they are arranged at approximately the same distance from each other with respect to the center of rotation. Thin, one-shaped synthetic resin molded magnets 11 that are magnetically polarized may be attached alternately and oppositely to each other at equal intervals.

Further, as shown in FIG. 6, on the inner surface of the turntable 9, there are four block-like flat magnet bodies Wl, W2°W3.
The W4 may be adhered so as to be alternately arranged with opposite polarities at substantially equal distances from the center of rotation and at equal intervals.

7. Figure 7 shows another embodiment of the present invention, in which the above-mentioned turntable device is used to produce sound from a record player, etc.
*If used as a turntable, ifrK&! 1
This prevents the magnetic flux generated from the 111 magnet from leaking above the tar/table and causing acoustic noise. Especially when the magnetic field of the magnet is strong, the leakage magnetic flux increases and the noise increases. be.

In other words, in FIG. 7, the voice amplifier table 9 C and the magnets W1, 82. VV3. 'N4, the yoke plate 12 is interposed between the magnet bodies wl, vvz, w3. Most of the magnetic flux generated from W4 passes through the yoke plate 12 and is designed to prevent it from leaking to one side of the top of the turntable. Figure @8 shows still another embodiment of the present invention, which is a turntable device in which the drive torque of the turntable is increased. That is, coil 81.82,
The donut-shaped insulating plate 3 to which power is distributed by I:l]II4 is fixedly supported on the upper part of the hub 2 of the fixed board 1, and is opposed to the fixed board 1 at a position separated from the fixed board 1.
A turntable 9 is rotatably supported on the shaft, and a magnet body 1. An annular iron plate 13 is attached to the outer peripheral end 9a of the turntable 9 in which R2, R3, and R4 are arranged alternately as N and S poles.
The fixed substrate 1 and the insulating plate 30 are installed so as to be disposed in a gap therebetween.

On the annular iron plate 13, four magnets having substantially the same shape on the upper surface and arranged at substantially equal distances from the center of rotation and alternately magnetized with opposite polarities at equal intervals. Nl,
N2. N3. The thin annular synthetic resin body 14 on which N4 is printed is attached to the coil 81 placed on the front termination plate 3,
In the case of the turntable device described above, the magnets are distributed to the upper and lower corners of the coils 81, 82, and 83, so the drive torque of the turntable is large. I can do it.

In the embodiment shown in FIGS. 2 and 3, three coils 81, 82, 83 are arranged on the insulating plate 3, and four magnets fL1, R2 are arranged on the inner surface of the turntable 9.

R3 and R4 are arranged. In general, as shown in FIG.
I! , heating, and a plurality of magnets CI, C2, C on the inner surface of the turntable 9, as only a part of which is shown in FIG. 1O.
3, C4, etc. can be placed.

11 and 12 show an example of application of the device according to the present invention. That is, FIG. 11 shows an example in which a substrate l is mounted and fixed on a support plate 21 via a vibration absorbing material 19 such as a rubber plate. Note that a recess 22 is bored in the lower ffJjIJ part of the support plate 21. An elastic member 23 such as an air bellows is inserted into the recess 22 . The vibration absorbing material 19 connects the magnet bodies 81° R2, R3, FL4 and the coils 191, 82.
, 83 themselves are absorbed. Furthermore, the thick support plate 21 and elastic member 23 have the effect of preventing resonance of the turntable device due to high frequency vibrations in the external environment.

FIG. 12 shows an example in which the substrate 1 is incorporated into a dish-shaped body 20 via a flexible member 19 on the lower surface thereof, and is supported by a support plate 21 and an elastic member 23 attached to the outer peripheral edge of this dish-shaped body 20. It is flatter than in Figure 11.

As described above, according to the present invention, the rotation table has approximately the same shape on its inner surface, and alternately takes on opposite polarity at approximately equal distances from the center of rotation at 14 positions equally spaced from each other. The turntable is driven directly by the electromagnetic force between the magnetically arranged magnets and the nine coils arranged on the fixed board in correspondence with the axial direction of the turntable, so the turntable can move at the desired speed. In addition, the magnet body and the coil can be made thin and light, and in particular, the magnet body can be printed on a thin synthetic tree body and exchanged. This is effective when using a thin synthetic resin molded magnet body magnetized with opposite polarity to 1 or when a printed wiring coil is used as the coil.
Lol! According to the present invention, the plurality of coils are fixed to the fixed substrate so as to face the magnet body in the direction of the turntable axis. Therefore, there is no need to provide a stator core or the like to support the coil, and therefore, no vibration torque is generated due to mutual transmission between the stator core and the magnet, and uneven rotation of the turntable is prevented. Can be made smaller. This means that when the present invention is used in an acoustic WiaK such as a record player, excellent sound quality can be obtained. As a matter of fact, the present invention produces various kinds of young fruits.

By the way, when using the above-mentioned turntable device in an acoustic device such as a player, mKk!
, it is possible that the magnetic flux generated from the magnet body leaks above the turntable, and the resulting acoustic noise becomes a particular problem. In that case, the solution is to interpose a yoke plate between the turntable and the magnet body so that most of the magnetic flux generated from the magnet body is directed into the yoke plate so that it does not leak upward to the turntable. is possible.

[Brief explanation of drawings]

FIG. 1 is a vertical sectional view showing a first example of the turntable device main body according to the present invention, FIG. 42 is a scale-P view showing the structure of the upper surface of the insulating plate in FIG. A is a scale flat +m diagram showing the structure of the inner surface of the turntable in Figure 1;
FIG. 184 is a diagram IIji11 of a circuit for driving and controlling the main body of the turntable device shown in No. 11g. 5 and 6 are one-dimensional plan views showing other examples of the inner surface of the turntable in FIG. 1. 7th white is a vertical cross section showing a second example of the turntable device main body according to the present invention; FIG. side view,
@Figure 9 is a partial plan view showing another variation of the structure of the upper surface of the insulating plate of the turntable device shown in Figure 1, and Figure 10 is the
Other 9 &! of the structure of the inner surface of the turntable of the turntable device in the figure! FIG. 3 is a partial plan view showing an example. 811
12 and 12 are longitudinal sectional views showing an application example of the turntable device according to the present invention. l...Fixed board, 3...Insulating plate, 81-82.
S3...Coil, Vl/V2@V3...Vertical detector, 7...Turntable axis, 9...Turntable, R1@R, 2, R3, R4...Magnet, TI −
T2・T3・TR...transistor, E...DC power supply, TSC...speed control circuit, DI...constant voltage diode °, 1t...resistance, 11・Wl・vv2・R
3.R4...Magnet body, 12...Yoke plate, Nl/N
2.N3...Magnet body,)3...jjI-shaped iron plate. 71 Patent Attorneys Kensuke Norichika (and 1 other person) □□−□Kamo□□! □Kenko Itoban Leap →- Figure 1 Figure 2 Syo Figure 4 Figure 5 Figure 6
. @Figure 8 Figure 9

Claims (1)

[Claims] (1) a fixed substrate; a turntable rotatably supported by the fixed substrate and disposed facing the fixed substrate;
Inside this turntable, there are plate-shaped magnets having substantially the same shape and arranged with opposite polarities alternately at substantially equal distances from the center of rotation, and the magnets. a plurality of coils arranged facing each other and provided on the fixed substrate; a position detection device provided on the fixed substrate for detecting the relative electromagnetic positions of the coils and the magnet;
A turntable device comprising: a current control device that is activated by an output signal of the position detection device and controls a direct current supplied to the coil.