JPH0130204B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a record adsorption device that firmly adsorbs a record to be played on a turntable of a record reproducing device.

It is well known that warping of records causes unnecessary resonance, which deteriorates the quality of the reproduced sound.
In order to eliminate this problem, a plurality of independent suction cups are formed on the turntable sheet made of an elastic material such as rubber, and these suction cups fix the record by suction, while also correcting the warpage. A turntable sheet has been proposed (for example, see Utility Model Publication No. 56-23775). However, with this sheet, the suction cup is located in the sound groove of the record, which causes air leaks and does not attract enough air, and the record is held so that it is lifted above the sheet, so the record Unwanted resonance is likely to occur due to factors other than warping of the board. Another drawback was that it was troublesome to attach and detach the record.
On the other hand, a disc-shaped frame that forms an air chamber between the lower part of the record is provided, the air in the air chamber is removed with the record placed, and the negative pressure is used to move the record into the frame. A record suction board designed to be adsorbed on the top was published in Japanese Patent Application No. 80645 (1983).
195302) etc. However, this suction cup requires a separate vacuum pump to remove air and a valve to selectively seal the air chamber, making the structure complex and resulting in an increase in production costs. .

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a simple record suction device which can securely suction and fix a record by simple operation and which can be manufactured with a small number of parts.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIGS. 1 and 2, a record disc suction device 1 according to the present invention has a cover 2 formed in a bag shape from a rubber sheet, and a record disc 3 is inserted into the cover 2. A disk-shaped substrate 4 having a slightly smaller diameter and an upper plate 5 having the same diameter are placed vertically opposite each other at a predetermined interval. That is, the substrate 4 is fixed to the bottom surface of the cover 2, while the upper plate 5 is attached to the peripheral wall 6 of the cover 2 above the substrate 4 with adhesive or the like.
is fixed to. The peripheral wall 6 of the cover 2 is formed to have a dogleg-shaped cross section and is bendable, thereby movably supporting the upper plate 5 with respect to the substrate 4. The upper edge of the cover 2 is an annular outer seal 7 formed to expand outward at a slight upward angle.
The outer periphery of the record 3, that is, the groove guard, is in close contact with the record 3. A first insertion hole 9 is formed in the center of the substrate 4, through which a center spindle 8 of a turntable (not shown) is inserted. In this case, a packing 10 is provided in the first insertion hole 9 to provide an airtight seal between the first insertion hole 9 and the center spindle 8, and this packing 10 is integrally connected to the cover 2. Furthermore, a second insertion hole 11 for inserting the center spindle 8 is also formed in the center of the upper plate 5, and therefore,
The center spindle 8 passes through the center of the substrate 4 and the upper plate 5 and projects onto the upper plate 5. Furthermore, a partition wall 12 is provided concentrically between the substrate 4 and the upper plate 5 to form an annular air chamber 13 together with the peripheral wall 6 described above. The partition wall 12 is made of a rubber sheet similarly to the peripheral wall 6, and is formed to have a dogleg-shaped cross section, for example, so as to be bendable.
In connection with this air chamber 13, a communication hole 1 is provided in the upper plate 5.
4 and 14 are formed. Further, leaf springs 15, 15 are attached to the lower surface of the upper plate 5 and extend diagonally downward, thereby urging the upper plate 5 in a direction away from the substrate 4. On the other hand, upper plate 5
In addition to the outer seal 7, an annular inner seal 1 centered around the second insertion hole 11 is provided on the top surface of the
6 are erected. This inner seal 16
is arranged so as to be in close contact with the non-recording zone near the label section of the record disc 3, and creates an airtight space between it and the outer seal 7 when the record disc 3 is placed. Note that this space communicates with the air chamber 13 through the communication hole 14 described above.

Next, the operation of this invention will be explained. A record 3 is placed on the upper plate 5 so that its groove guard is in close contact with the outer seal 7. When the record 3 is pushed down together with the upper plate 5 against the leaf spring 15, the air chamber 13 is compressed and the air passes through the communication holes 14, 14, and then the record 3 and the outer seal 7 are pressed down. Escape from between to the outside. As a result, as shown in FIG. 3, the peripheral wall 6 of the cover 2 is bent, and the substrate 4 is bent.
The distance between the upper plate 5 and the upper plate 5 is narrowed. In this way,
The outer seal 7 is brought into close contact with the groove guard of the record disc 3, the inner seal 16 is brought into close contact with the non-recording zone inside the record disc 3, and the air chamber 13 is brought into a sealed state. When the pressing force is released in this state, the upper plate 5 tries to return upward due to the urging force of the leaf springs 15, 15, but since the air inflow passage is closed, the air chamber 13 is maintained in a reduced pressure state. . As a result, the record 3 is tightly attracted to the upper surface of the upper plate 5 so that its warp is corrected. On the other hand, when removing the record 3, the outer seal 7 may be peeled off to create a gap between the outer seal 7 and the record 3 to allow air to flow in. Then, due to the biasing force of the leaf springs 15, 15, the distance between the base plate 4 and the upper plate 5 returns to the state shown in FIG. Can be removed.

Incidentally, as a modification of the above-described embodiment, the peripheral wall 6 and the outer seal 7 may be formed separately and fixed to the substrate 4 and the upper plate 5 without using the cover 2. It should be noted that seals 7 and 16 are preferably made of a flexible material such as neoprene rubber. Further, the peripheral wall 6 may be made of an elastic material with strong self-restoring properties, and its elasticity may be used to urge the upper plate 5 away from the substrate 4. In that case, the leaf springs 15, 15 can be omitted.

As is clear from the description of the embodiments described above, according to the present invention, the record can be completely tightly fixed on the top plate, and excellent sound quality without unnecessary resonance can be expected. Furthermore, the record can be attached and detached by simple operations.
Furthermore, the structure is very simple compared to conventional ones, the number of parts is small, and each part can be easily processed, so it can be manufactured at low cost.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a record disc suction device according to the present invention, FIG. 2 is a plan view of FIG. 1 with the record disc removed, and FIG. 3 is an explanatory diagram of the operation. In the figure, 1 is a record adsorption device, 2 is a cover,
3 is a record disc, 4 is a substrate, 5 is a top plate, 6 is a peripheral wall, 7 is an outer seal, 8 is a center spindle, 9 and 11 are insertion holes, 12 is a partition wall, 13 is an air chamber, 14 is a communication hole, 15 is a leaf spring, and 16 is an inner seal.

Claims (1)

[Claims] 1. A record adsorption device disposed between the turntable and the record to hold the record on a turntable having a center spindle, the center spindles being coaxially bored with each other at the center. A pair of substrates and a top plate, each having a first insertion hole and a second insertion hole for the purpose, and arranged one above the other at an appropriate interval; a flexible outer peripheral wall whose inner peripheral upper and lower edges are joined; and a flexible flexible wall located between the substrate and the upper plate so as to form an annular air chamber with the outer peripheral wall; an annular inner peripheral partition wall, and an outer side of the upper surface of the upper plate so as to be in close contact with the outer peripheral edge of the record disc and the inner peripheral edge of the sound groove portion, respectively, and to form an airtight space therebetween. an outer seal and an inner seal provided concentrically on the inner side, a communication hole bored in the upper plate so as to communicate the space and the air chamber, and a communication hole between the substrate and the upper plate. an elastic means located between them and biasing in a direction to widen the gap therebetween; the record disc is placed on the upper plate, and the record disc and the upper plate are brought close to the substrate; The air in the air chamber is discharged through the communication hole and the joint between the outer periphery of the record and the outer seal, and the air in the air chamber is reduced in pressure. A record adsorption device characterized by being suctioned and fixed onto a board.