JPS6319922Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention is equipped with a disc stabilizer that allows discs such as records to be stably placed on the turntable by adhering them to the turntable using a vacuum, thereby improving the sound quality of the reproduced sound. The invention relates to a record player.

Figure 1 shows a conventional example of a record player equipped with this type of disc stabilizer.
Reference numeral 1 denotes a main turntable, and a spindle 3 is provided at the center of the top surface of the turntable, into which a center hole 2a of a disc 2 such as a record is fitted, and a ring made of rubber or soft synthetic resin is provided on the inner circumference of the top surface and the outer circumference of the top surface. A disc 2 such as a record is placed on the ceiling pads 4, 4', and when the disc 2 is placed, the disc 2 and the main turntable 1 are A space 5 is formed between the top surface and the top surface.

Further, a sub-turntable 6 is joined and assembled to the center of the lower surface of the main turntable 1, and a boss 6 at the center of the sub-turntable 6 is assembled.
a is rotatably fitted to the support shaft 8 via the bearing metal 7, and is connected to a ball holder 9 provided at the upper end of the support shaft 8 and a ball holder 10 provided at the center of the sub-turntable 6. A bearing ball 11 is provided between them, so that the main turntable 1 and the sub-turntable 6 are coaxially supported by a support shaft 8 and rotated. Note that the lower end of this support shaft 8 is fixed to the chassis 12.

A ventilation path 13 is provided between the bottom surface of the main turntable 1 and the top surface of the sub-turntable 6, and a ventilation path 13 is provided between the above-described disk 2 and the top surface of the main turntable 1. A ventilation passage 14 communicating with the space 5 is provided, and
A ventilation passage 15 communicating with the ventilation passage 13 is provided between the boss 6a of the sub-turntable 6 and the ball receiver 10, a ventilation passage 16 communicating with the ventilation passage 15 is provided on the spindle 8, This ventilation path 16
A ventilation passage 17 is provided in the chassis 12 and communicates with a vacuum pump (not shown). Note that 18 is a sealing material (packing) interposed between the main turntable 1 and the sub-turntable 6. Also, 1
Reference numeral 9 denotes a belt hanging portion for rotationally driving the main turntable 1 with a belt drive.

The conventional example configured as described above has the following drawbacks.

When the vacuum pump is malfunctioning or intentionally stopped and does not adsorb the disk, only the inner and outer circumferential portions of the disk 2 are placed on the sealing pads 4 and 4'.
Since it is floating above the top surface of the main turntable 1, the playback characteristics will be significantly worse than that of a conventional general player.

Since it is a combination of the main turntable 1 and the sub-turntable 6, its structure is complicated and expensive.

A sealing material 18 is required between the main turntable 1 and the sub-turntable 6.

When the disc 2 is attracted, the sealing pads 4 and 4' are bent and the disc 2 comes into contact with the top surface of the metal main turntable 1, resulting in poor cutting and polishing of the top surface of the main turntable 1. In some cases, the disc may be damaged, and therefore the top surface of the main turntable must be well finished, resulting in high costs.

Even if there is a small amount of dirt on the turntable, it will scratch the disc because the turntable is hard.

This invention provides a record player equipped with a disc stabilizer that eliminates the drawbacks of the conventional example described above.
This will be explained in detail according to the drawings.

Reference numeral 20 denotes a turntable shaft with an axial ventilation passage 21 provided at its axial center, and 22 a spindle member fitted to the upper end of the turntable shaft 20, with a disc 23 such as a record at the center of the upper end. A projection 22a is formed into which the center hole 23a of the turntable 24 is fitted, and a center hole 24a of the turntable 24 is fitted into the cylindrical portion 22b below the projection 22a.

This turntable 24 has a flat top surface 24b and a concave top surface 24b near the center hole 24a.
It is formed in c.

25 is a turntable mat whose center hole 25a is fitted into the protrusion 22a at the upper end of the spindle member 22 and placed on the upper surface of the turntable 24; As shown in Figure A, ring-shaped suction grooves 26 ₁ and 2 that vacuum-adsorb the disk 23 placed thereon
6 ₂ and a through hole 26 that communicates with this ring-shaped suction groove and reaches the lower surface of the turntable mat 24.
₁ ′, 26 ₂ ′ are provided, and between the lower surface of the turntable mat 25 and the upper surface of the turntable 24, the suction grooves 26 ₁ , 26 ₂ and the through holes provided on the upper surface of the turntable mat 25 are provided. 26 ₁ ′,
In this _embodiment , the ventilation path is provided on the underside of the turntable mat 25, as shown in FIGS. 3B and 3C.
A ventilation passage 21 provided in the turntable shaft 20 and a ventilation passage 27 provided on the side of the cylindrical portion 22b of the spindle member 22 so as to communicate with the ventilation passage 21.
It is made by forming a reverse groove 28 facing toward the center so as to communicate with the.

In this way, most of the ventilation passages for suctioning the disk are provided on the turntable mat side, but in order to suction the entire lower outer circumference of the turntable mat 25 to the upper surface of the turntable 24, A ring-shaped groove 24d is formed on the outer periphery of the upper surface of the table 24 and communicates with the through hole 26 ₂ ' provided on the outer periphery of the turntable mat 25.
is provided.

29 is a space between the center of the lower surface of the turntable mat 25 and the concave surface 24c at the center of the turntable 24 when the turntable mat 25 is placed on the turntable 24; Above turntable mat 2 via
The reverse groove 28 formed on the lower surface of the spindle member 22 communicates with the air passage 27 formed in the cylindrical portion 22b of the spindle member 22.

The lower end of the turntable shaft 20 is
It is rotatably attached to a bearing 32 attached to the chassis 30 via a mounting plate 31, and its lower end is rotatably supported by a slide bearing 33.

The lower end of the ventilation passage 21 provided in the axial direction at the axial center of the turntable shaft 20 is connected to the connecting ventilation passage 3.
4, it is connected to a vacuum pump (not shown) or the like.

35 is a flywheel member attached to the outer circumference of the lower surface of the turntable 24.

Reference numeral 36 denotes a rotor portion constituting a motor fixed to be located near the middle portion of the turntable shaft 20, 36a a magnet constituting the rotor portion, 37 a stator portion constituting the motor;
Reference numeral a denotes a drive coil constituting the stator portion, and this drive coil 37a is attached to a mounting plate 31 fixed to the chassis 30 and a substrate 37b attached to the bearing 32.

The motor configured in this manner has a rotation speed that is determined by passing a drive current obtained by an electric circuit (not shown) having a so-called quartz synthesizer system through the drive coil 37a.
Designed to be 33rpm or 45rpm,
This is a so-called direct drive motor.
38 schematically shows a vacuum mechanism.

Since this invention is configured as described above, when a vacuum pump (not shown) or the like is operated, the connection air passage 34, the air passage 21 provided in the turntable shaft 20, and the spindle member 2
2, a space 29 between the concave surface 24c at the center of the turntable 24 and the lower surface of the center of the turntable mat 25, and a reverse groove 28 provided on the lower surface of the turntable mat 25, respectively. Through this, the air in the suction groove hole 26 provided on the top surface of the turntable mat 25 is sucked, and the disk 23 placed on the top surface of the turntable mat 25 is thereby attracted to the turntable mat 25 and turned. It is stably placed on the table 24 and the turntable mat 25 without moving, thereby improving the quality of reproduced sound.

Furthermore, since this invention is configured as described above, it has the following features.

Unlike the conventional example, a turntable mat is used, and a suction groove for suctioning the disk is provided on the upper surface of the turntable mat, and an inverted concave groove is provided on the lower surface of the turntable mat to serve as a ventilation path communicating with the suction groove. There is no need to provide a ventilation path on the top surface of the turntable or to precisely finish the top surface of the turntable.

Since the structure is not a combination of a main turntable and a sub-turntable as in the conventional example, manufacturing costs are low, and there is no need for a seal between the main turntable and sub-turntable.

By making the turntable mat of rubber or soft synthetic resin, when the vacuum pump is operated, the turntable, turntable mat, and disk are attracted to each other and rotate as one without moving each other. The flexibility of the turntable mat also has the effect of damping the vibrations of the turntable and disk, further improving vibration isolation performance.

Even if the vacuum pump is malfunctioning or intentionally stopped and does not attract the disc to the turntable, the disc will not be floating on the turntable as in the conventional example, and the disc will not stick to the turntable, and the vacuum pump will continue to operate like a regular player. Since the entire bottom surface of the disk is placed on the top surface of the turntable mat, the disk will not move and affect the sound quality.

Since most of the disk suction/adsorption structure is integrally formed on the turntable mat side, the manufacturing cost is much lower than when the structure is processed and provided on the turntable.

The rotor is attached to the middle of the turntable shaft, and the stator is attached to the chassis in correspondence with the rotor to form a motor, creating a so-called direct drive. It is also possible to provide a record player with good rotational precision and at low cost.

[Brief explanation of drawings]

Fig. 1 is a vertical side view of a record player equipped with a conventional disc stabilizer, Fig. 2 is a longitudinal side view of a record player equipped with a disc stabilizer of this invention, and Figs. 3 A, B, and C are turntables. FIG. 3 is a top view, a sectional view, and a bottom view of the mat. 20...Turntable shaft, 21...Air passage, 22...Spindle member, 22a...Protrusion, 22b...Cylindrical part, 23...Disc, 24
... Turntable, 24a ... Center hole, 24b
...Flat view, 24c...Concave surface, 24d...Ring-shaped groove, 25...Turntable mat, 25a
... Center hole, 26 ₁ , 26 ₂ ... Suction groove, 26 ₁ ',
26 ₂ '...Through hole, 27...Air passage, 28...Reverse groove, 29...Space, 30...Chassis, 31
... Mounting plate, 32 ... Bearing, 33 ... Thrust bearing, 34 ... Connection air passage, 35 ... Flywheel member, 36 ... Rotor section, 36a ... Drive magnet, 37 ... Stator section, 37a ... ... Drive coil, 37b... Board, 38... Vacuum mechanism.

Claims (1)

[Scope of utility model registration request] A turntable shaft is rotatably held by a bearing and has a ventilation passage communicating in the axial direction from the side of the upper end, and a protrusion on the upper end that fits into the center hole of the disk; a vacuum mechanism communicating with the lower end;
A turntable attached to the upper end of this turntable shaft, a turntable mat placed on the upper surface of this turntable, a rotor constituting a motor attached to rotate integrally with the turntable, and this rotor. The upper surface of the turntable mat is provided with a suction groove for vacuum suction of the disk placed on the turntable mat, and the lower surface of the turntable mat is provided with a suction groove for vacuum suction. What is claimed is: 1. A record player equipped with a disc stabilizer, characterized in that a ventilation path is formed as a groove and an inverted groove facing toward the center so as to communicate with the ventilation path provided in the turntable shaft.