JPH0132562B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a record suction device that integrally suctions and fixes a record to a turntable during record performance.

In order to prevent cross-modulation distortion caused by warped records and rumble noise caused by radiated sound pressure from speakers, etc., it is necessary to mount the record disc integrally with the turntable. FIG. 1 shows an example of this type of device, which consists of a disc-shaped seal 2 made of synthetic rubber or the like placed on a turntable 1, and a record disc 3. It consists of an intake tank case 5, called a suction adapter, which is placed over the label part 4 and has an open bottom surface. The seat 2 is provided with a seal 6 formed in a flange shape so as to be in close contact with the outer periphery of the record 3. On the other hand, the tank case 5 has a sealing rubber 7 attached to its opening edge. , an intake and exhaust valve 8 is attached to the top wall. Therefore, in this device, the record 3 is placed on the turntable 1 via the sheet 2 described above, and the label portion 4 is placed on the turntable 1.
A tank case 5 is placed on top so as to cover the center spindle 9. Then, by connecting a vacuum pump or the like to the intake/exhaust valve 8 and vacuuming the inside thereof, air between the sheet 2 and the record 3 is transferred between the center spindle 9 and the center spindle insertion hole 10 of the record 3. The record 3 is suctioned and fixed onto the sheet 2 by suction from the gap. However, since the label part 4 is covered with paper (label paper), the airtightness between the tank case 5 and the label part 4 is not good.
In order to maintain a negative pressure state for a long period of time, it is necessary to increase the size of the tank 5, which means that the depressurization operation takes more time. In this case, attach the opening edge of the tank case 5 to the label portion 4.
A certain degree of airtightness can be ensured by applying it to the non-recording surface of the outer periphery, but on the other hand, there is a risk of damaging the stylus tip when the cartridge reaches the innermost periphery, which is not preferable. Furthermore, since it is necessary to play a record with this device while the tank case 5 is attached, there may be some inconveniences such as the case cover of the record reproducing device being unable to be closed.

SUMMARY OF THE INVENTION An object of the present invention is to use the above-mentioned suction adapter to suck air from the gap between the center spindle insertion hole of the record and the center spindle of the turntable. To provide a record adsorption device capable of maintaining a good pressure and playing a record with its suction adapter removed after a pressure reduction operation.

Hereinafter, embodiments of the present invention will be described with reference to FIG. 2 and subsequent figures. Note that in the figure, parts corresponding to those in FIG. 1 are given the same reference numerals.

As shown in FIGS. 2 to 4, the record disc suction device 11 according to the present invention has a disc body 12 that has approximately the same diameter as the turntable 1 and is removably placed thereon. This disc body 12 has a center hole 13 through which the center spindle 9 of the turntable 1 is inserted. This center hole 13
A seal ring 14 is fitted on the inner wall of the
Airtightness is maintained between the center spindle 9 and the center spindle 9. Further, a boss 15 is formed around the center hole 13, and the disc body 2 is provided with an annular air chamber 16 centered around the boss 15.
A center plate 17 having a smaller diameter than the center plate 17 is fitted concentrically into the air chamber 16 using the boss 15 as a guide. Therefore, a gap is provided between the inner peripheral wall of the air chamber 16 and the outer periphery of the center plate 17.
6 is a record 3 placed on this disc body 2
It is designed to open at the bottom of the sound groove. A flange-shaped inner seal 18 is attached to the outer periphery of the center plate 17 so as to extend inward at a slight upward angle. This inner seal 18 is made of a flexible material such as neoprene rubber, and is adapted to come into close contact with the non-recording surface of the record disc 3 adjacent to the label section 4. In this case, the center plate 17 is equipped with a suction valve 19 that selectively opens and closes based on the pressure difference between the air chamber 16 and the space below the label portion 4 of the record 3 placed thereon. Also,
The upper surface and peripheral wall of the disc body 12 are covered with a sheet 20 made of a flexible material such as neoprene rubber, and a sheet 20 is provided on the outer peripheral edge of the sheet 20.
A flange-shaped outer seal 21 is provided integrally with the flange-shaped outer seal 21 so as to extend outward at a slight upward angle. This outer seal 21
is adapted to be in close contact with the outer periphery of the record 3 including the groove guard. A strip 22 for release operation is attached to the outside of the outer seal 21.

On the other hand, this record disc suction device 11 is equipped with a suction adapter 23. This suction adapter 23, like the above-mentioned intake tank case 5, has a case 24 with an open bottom surface that is placed over the top surface of the label section 4 of the record disc 3 so as to surround the center spindle insertion hole 10. An annular sealing rubber 25 is attached to the edge of the opening to ensure good airtightness with the label portion 4. The case 24 is also provided with an intake hole 26 connected to a suction pump (not shown) and a release valve 27 for releasing the reduced pressure state.

In the above configuration, the disc body 12 is installed on the turntable 1 by inserting the center spindle 9 through the center hole 13 thereof. Then, the record disc 3 is placed on the disc body 12, and the suction adapter 23 is placed on the upper surface of the label portion 4 of the record disc 3 so as to cover the center spindle insertion hole 10 and the center spindle 9. In this state, connect the suction pump (not shown) to the intake hole 2.
6 and vacuum suction is performed, the air sealed by the record 3 passes from the air chamber 16 through the suction valve 19 and into the center spindle insertion hole 1 of the record 3, as shown by the arrow in FIG.
Case 2 passes through the gap between 0 and center spindle 9.
4 is sucked inwards. Therefore, those spaces become in a negative pressure state, and the record 3 becomes the disc body 1.
It is fixed by suction on 2. Then, by opening the release valve 27 and opening the inside of the case 24 to the atmosphere, the suction adapter 23 is attached to the record disc 3.
It can be removed from the top. In this case, the suction valve 19 closes instantaneously due to the pressure difference, so the air chamber 16 of the disc body 12 is closed by the inner seal 1.
8 and the outer seal 21 to maintain a negative pressure state with good airtightness. As a result, record 3
is maintained in a state where it is suctioned and fixed on the disc body 12, and the turntable 1 can be rotated to enter the performance state. In addition, a sheet 2 is provided on the upper surface of the disc body 12.
Since the sheet 20 is coated with
It will be buried in the side, and there is almost no risk of damage to the sound groove section. When the performance is over and the record 3 is to be removed, as shown in FIG. , just release the negative pressure state.

FIG. 7 shows a modified embodiment of the suction valve described above. That is, a large opening is provided in the center of the center plate 17 so as to loosely fit into the boss 15. In this case, the center plate 17 has a plurality of screws 28.
It is mounted in the air chamber 16 of the disk body 12 via the spacer 29. A flange-shaped suction valve 30 that extends slightly upward and inward is attached to the inner periphery of the center opening of the center plate 17, and in connection with this, a tapered wall 31 is provided on the upper outer periphery of the boss 15. The suction valve 30 is configured to elastically come into close contact with the tapered wall 31. Therefore, under normal conditions, this suction valve 30 is closed, but when the above-mentioned suction pump is operated,
The air in the air chamber 16 is sucked through the gap between the suction valve 30 and the boss 15 so as to push the suction valve 30 outward.

Note that the present invention is not limited to the embodiments described above, and for example, the record disc suction device may be formed integrally with the turntable of a record player. It is also possible to incorporate a suction pump into the suction adapter.

As is clear from the description of the embodiments described above, according to the present invention, there is provided a record in which a suction adapter is placed on the record and air is taken in from the gap between the center spindle insertion hole of the record and the center spindle of the turntable. In the disc suction device, an outer seal and an inner seal are provided on the disc body to ensure airtightness against the record disc, and
By providing an air chamber inside thereof that acts as a negative pressure accumulator, it is possible to suction and hold a record well for a long period of time without relying on a suction adapter as in the conventional case. Therefore, the suction adapter can be removed from the record to play the record, and
The sealing rubber of the suction adapter placed on the label part is no longer required to have a very high degree of airtightness, making it easier to select materials and design.
On the other hand, in this invention, a suction valve is required to shield the air chamber when the suction adapter is removed, but since this valve can be of an extremely simple structure such as a flap valve, it is possible to The spindle itself can be made thinner and can be sufficiently adapted to turntables with different center spindle lengths. In addition, a suction adapter that is small enough to cover the center spindle insertion hole of a record is sufficient.
You can easily perform decompression operations.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing a conventional record disc suction device, Fig. 2 and the following show embodiments of the present invention;
Fig. 4 is a plan view of the suction adapter, Fig. 5 is a sectional view showing the record disc suction state, Fig. 6 is a partially enlarged sectional view showing the suction release operation, and Fig. 7 is a partially enlarged view showing another embodiment. FIG. Figure 1 is a turntable, 3 is a record,
4 is a label section, 9 is a center spindle, 10 is a center spindle insertion hole, 11 is a record adsorption device, 12 is a disk body, 16 is a negative pressure chamber, 17 is a center plate, 18 is an inner seal, 19 is a suction Valve, 21 is outer seal, 22 is release leaf, 23 is suction adapter, 2
4 is a case, 25 is a sealing rubber, 26 is an intake hole, 27 is a release valve, and 30 is a suction valve.

Claims (1)

[Scope of Claims] 1. A disc body having a sealing means for forming an airtight space between it and a record disc to be placed thereon, and which is rotated by a drive motor of a record playback device; The record disc is removably and airtightly placed around the center hole of the record, and the record is suctioned and fixed onto the disc body by suctioning air in the space through the center hole. A record disc suction device comprising: a suction adapter; the disc body has a recess formed to have an inner circumference wider than an outer circumference of a label portion of the record; and a recess in the recess. a plate portion that covers the upper opening and is located below the disk so as to form an air chamber with the disk, the outer circumference of which is smaller than the inner circumference of the recess; an outer seal is provided along the outer periphery of the record disc and is in close contact with the outer periphery of the record disc, and an inner seal is attached to the outer periphery of the plate part along the periphery of the label part of the record disc so as to be in close contact with the outer periphery of the label part of the record disc. , the plate part has a communication hole for communicating the air chamber with a first space formed by the inner seal and the record; and a communication hole located in the communication hole to allow suction by the suction adapter. a check valve that opens upon operation, and the air in the second space surrounded by the outer seal, the inner seal, the record disc, and the disc body flows between the inner circumferential surface of the recess and the plate. A record disc suction device characterized in that suction is carried out from a gap between the air chamber and the outer peripheral edge of the suction adapter through the air chamber, the check valve, the first space, and the center hole.