JPS62175990A - Reproducing device for recording disk - Google Patents

Abstract

PURPOSE:To remove and clean a floating minute dust, and to prevent the minute dust from being stuck to a recording disk, by providing plural pieces of blades in a radial direction between the upper disk and the lower disk of a rotary table, providing an inflow hole for making air of the outside flow into the root side of the blade between said upper disk and lower disk, and surrounding the outside of this inflow hole by an air filter. CONSTITUTION:An air filter 19 is fixed by fitting it to an annular projecting body 18 by an annular edge body 20, and surrounds the outside of each inflow hole 13a. By placing a recording disk on the upper disk 12 of a rotary table 11, and rotating the rotary table 11 in the direction as indicated with an arrow R by a motor 15, air of the outside is absorbed as indicated with an arrow A by the fan action of a blade 14, minute dust is removed through the air filter 19. This cleaned air is absorbed from the inflow hole 13a, and blown off to the outside as indicated with an arrow B. In this way, air in the device re-circulated by the rotation of the blade 14, and cleaned through the air filter 19.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in a recording disk reproducing apparatus, and particularly relates to air filtration within the reproducing apparatus.

[Conventional technology]

Figures 6 and 1 are, for example, published in Japanese Patent Application Laid-Open No.
FIG. 1 is a perspective view and a cross-sectional view of a rotary table portion of a conventional recording disk reproducing apparatus shown in the publication. In the figure, reference numeral 1 denotes a rotary table on which a recording disk (not shown) is placed and rotated, and is attached to a rotating shaft 5 of a drive motor 4. 2 is a sliding scanning carriage equipped with a regenerative detector, 3I
I'i is the main body of the recording disk reproducing apparatus, and a frame 3aK drive motor 4 is attached thereto. Covers 7 are attached to the top and both sides of the outer frame 6, but are shown removed in the figure.

Next, the operation of the conventional device will be explained. The recording disk is placed on the rotary table IK, and the electric motor 4 is started to rotate the rotary table I. Subsequently, the scanning body carriage 2 is moved to move the detector onto the recording disk. For example, in the case of a video disk using a capacitive contact detection method, a needle descends from a detector and contacts the recording disk at its tip to detect information recorded on the recording disk.

[Problem that the invention seeks to solve]

The conventional recording disc reproducing apparatus as described above has a problem in that minute dust floating in the air inside the apparatus adheres to the recording disc and noise is mixed into the detection signal.

Further, in the case of a contact type detector, there is a problem in that the needle and the recording disk are subject to accelerated wear.

This invention was made to solve these problems, and it removes floating microscopic dust from the air inside the device, prevents it from adhering to the recording disk, and prevents noise from being mixed into the detection signal. The object of the present invention is to provide a recording disk reproducing device that prevents the wear of the stylus and the recording disk in the case of a contact type detector.

[Means for solving problems]

The recording disk reproducing apparatus according to the present invention includes a plurality of radial blades provided between an upper disk and a lower disk of a rotary table, and air from outside is provided between the upper disk and the lower disk on the root side of the blade. An inflow hole is provided for the inflow of water, and the external force of this inflow hole is surrounded by an air filter.

[Effect]

In this invention, when the rotary table rotates, outside air is sucked in from the inflow hole through the air filter by the fan action of the blades, and is discharged in the centrifugal direction to be circulated. As a result, the air inside the device is passed through the air filter, and floating minute dust is removed and cleaned, thereby eliminating the attachment of minute dust to the recording disk.

〔Example〕

1 and 2 are a perspective view and a front view, partially cut away, showing essential parts of an embodiment of the recording disk reproducing apparatus according to the present invention, and FIG. 3 is a lower view of the rotating disk portion of FIG. 42. FIG.

In the figure, reference numeral 11 denotes a rotating table on which a recording disk (not shown) is placed and rotates, and is composed of an upper disk 12, a lower disk 13, and a plurality of blades 14 provided between these in the radial direction. , the lower disk 13 has a plurality of inflow holes 13a on the center side.
is provided. 15 is a frame 3a of the main body 3 of the playback device;
A rotary table 1lt is attached to the rotary shaft 16 and rotated by a drive wJ electric motor attached to the rotary shaft 16. 17 is the rotation axis 1
6 t-supporting bearing, 18 is an annular protrusion fixed to the lower part of 1 disc 13, 19 is an air filter, and outer circumferential part 1
- It is fixed to the m-shaped edge 20, and the inner circumferential part is fixed to the annular edge 21. This air filter 19 has a ring shape 20
It is fixed by being fitted into the annular protrusion 18, and protects each inflow hole 13a from external forces.

The operation of the apparatus of the above embodiment is as follows.

Place the recording disk on the upper disk 12 of the rotary table 11, and
11 The rotary table 11 is rotated in the direction of the arrow R by the motor 15. As a result, due to the fan action of the blades 14, external force air is sucked in as shown by arrow A, and the air filter 19
Traces fine dust and removes it. This purified air is sucked in through the inlet hole 13a and is discharged outward as indicated by arrow B. In this way, the air within the device is circulated by the rotation of the blades 14 and is purified through the air filter 19.

FIGS. 4 and 5 are a partially cutaway perspective view and a front sectional view of a main part of a reproducing apparatus according to another embodiment of the present invention. In the figure, the shaft end of a rotating shaft 21 of an electric motor 15 is provided with an air inflow hole 22 at the center of the shaft, and a plurality of radial branch holes 23 branching from this inflow hole. A plurality of introduction holes 24 communicating with each branch hole 23 are provided in the boss portion of the rotary table 11 fitted into the rotary shaft 21 . 25 is a support ring fixed to the end of the rotating shaft 21; 26
An air filter is fixed to the annular edge 27, which is fixed by fitting the annular edge 27 into the support ring 25, and surrounds the outside of the inflow hole 22.

When the rotary table 11 rotates, the fan action of each blade 14 causes outside air to flow through the air filter 26 as shown by arrow C, and is surrounded by a cover as shown by the arrow for cooling. Although the container is provided with a small hole that communicates with the outside air, it may also be a container with a closed structure, and the device is cooled by circulation of the air inside the device by the fan action of the blades of the rotary table.

Further, in the above embodiment, the upper disk 12 of the rotary table 11
, the lower disk 13 and the blades 14 were formed integrally, but the blades were formed integrally with the upper disk or the lower disk, and the upper disk and the lower disk 1
d1 may be combined.

〔Effect of the invention〕

As described above, according to the present invention, several blades in the radial direction are provided between the upper disk and the lower disk of the rotary table, so that all of the air from external force flows into the root side of the fan of the rotary table. Since the outside of this air inflow hole is surrounded by an air filter, the fan action of the blades caused by the rotation of the rotary table draws air from the external force through the air filter and cleans it, preventing fine dust from adhering to the rotating disk. This eliminates noise from being mixed into the detection signal. In addition, in the case of the contact type recording disk reproducing device a, wear of the needle and disk is reduced.

[Brief explanation of drawings]

FIGS. 1 and 2 are a perspective view and a front view, partially cut away, showing essential parts of an embodiment of a recording disk reproducing apparatus according to the present invention;
Figure 3 is a perspective view from below of the rotary table part in Figure 2;
4 and 5 are front sectional views and partially broken perspective views of a rotary table section showing another embodiment of the present invention, and FIGS. 6 and 7 are top and side views of a conventional recording disk reproducing apparatus. FIG. 2 is a perspective view and a front sectional view of the rotary table section with the cover removed. 6...Outer frame, 7...Cover, 11...Rotary table, 12...Upper disk, 13...Lower disk, 13a...
・Inflow hole, 14...Blade, 15...Driver motor, 1
6... Rotating shaft, 19... Air filter, 21...
Rotating shaft, 22... Inflow hole, 23... Branch hole, 24.
...Special hole, 26...Air filter Note that the same reference numerals in the drawings indicate the same or equivalent parts.

Claims (2)

[Claims] (1) A rotary table in which a plurality of blades are provided in the radial direction between an upper disk and a lower disk, a recording disk is placed on the upper disk, and the rotary table is rotated by a drive motor, and the blades of this rotary table. What is claimed is: 1. A recording disk reproducing device comprising an air filter surrounding the outside of an inflow hole that guides outside air to the base side of the recording disk. (2) The container consisting of an outer frame and a cover and housing the main body and the rotary table has a sealed structure, and is cooled by circulation of air inside the container by the blades of the rotary table. The recording disk reproducing device according to item 1.