JPS62183002A - Turntable - Google Patents

Abstract

PURPOSE:To improve the supporting capability of a disk by constituting a turntable supporting a disk with a base made of a hard material and an outer ridge member made of a soft material and providing ruggedness to the disk supporting face of the outer ridge member. CONSTITUTION:The base 13 made of a hard material such as a hard resin has a flange face 13a and a hole 13b for a center ring, a supporting face 13c required to support the inner circumference of the disk 2 is formed concentrically to the upper face of the disk expanded and reference faces 13d, 13e required to form the outer ridge member 14 are formed concentrically to upper and lower face of the disk. The reference face 13d has the same height as the disk supporting face of the peripheral side and the reference face 13e keeps a prescribed thickness accuracy to the reference face 13d. Faces 14a, 14b of the outer ridge member 14 made of a soft material such as rubber having the same height as the reference faces 13d, 13e of the base 13 are formed concentrically with a prescribed width.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an information recording disk (hereinafter referred to as a disk) on which information is recorded in an information signal reproducing device such as a video disk player. This relates to a turntable that is placed on a z-mounted turntable.

BACKGROUND OF THE INVENTION Usually, an information signal reproducing device includes a rotation drive section that supports and rotates a disk 7, a detection section that detects signals from the disk,
It consists of a signal processing section that further converts the detected signal, and a mechanism section that raises and lowers the disk that moves the detection section.

5 and 6 show the overall structure of an example of an information signal reproducing apparatus, and FIG. 7 shows the structure of a signal detecting section of the information signal reproducing apparatus. In this example, a needle-contact type video disc player is used, and a conventional turntable is used. First, in FIGS. 5 and 6, 1 is a turntable, 2 is a disk, 3 is a center boss, 4 is a cartridge, 5 is a detection circuit, 6 is an arm, 7 is a clamp, and 8
is a roller, 9 is a shaft, and 10 is a leg. In Fig. 7, 14 is a needle, 15 is a lead, 16 is a cantilever, 1
7 is Al with suspension. Incidentally, an example of a conventional turntable 1 is shown in FIGS. 8 and 9.

Conventionally, most turntables are die-cast or resin-molded products, and their structure has a clamping surface 1a for attaching to a rotational drive device (motor) and a hole 1b for centering. On the upper surface, a support surface 1c having a certain width necessary for fully supporting the disk is formed concentrically at the outer and inner circumferences. on the other hand,
The disk has concentric circles on the outer and inner sides of the area where the signal is recorded (signal surface) that is higher than the signal surface, and these portions serve as the support for the turntable 1 mentioned earlier. It is supported on surface 1C. The disk is centered by the safety post 3 and placed on the turntable, and the vicinity of the center hole is pressurized to increase the degree of close contact with the turntable.

Problems to be Solved by the Invention Most disks are mainly made of resin material, and they themselves have ridges (surface runout) in the thickness direction. If tracking is not possible, this will impede playback. Although it depends on the frequency response characteristics of the detector, in general, if the surface runout has the same amplitude, the higher the frequency, the more likely it is to interfere with reproduction. On the other hand, the entire playback device was vibrated, and a shock was applied from the outside)
Even in this case, these forces or vibrations are propagated to the disk, increasing the amount of surface runout.

In the conventional case, the turntable is a rigid body integrally formed of metal or resin, and it is easy to propagate vibrations and shocks applied from the outside, and the natural frequency of the vibration generated in the turntable itself is the unique frequency of the disk. The frequency is also high. If the disc is warped and the outer periphery is only partially in contact with the support surface of the turntable, or if the pressing force near the center hole is not sufficient on the outer periphery, apply pressure from outside. The high-frequency vibrations of the turntable generated by the vibrations and impacts transmitted to the disk are transmitted to the disk, where they appear as large-amplitude vibrations.

Conversely, the vibrations generated in the disc also cause a violent reaction due to the reaction from the turntable. In other words, the disc and turntable interfere with each other, especially at the outer periphery, and high-frequency and large-amplitude vibrations are applied to the disc, which, together with the surface runout of the disc itself, causes the detector to be unable to track it. Exceeding the limit and causing trouble in playback. In particular, in the case of a stylus contact type information signal reproducing device, stylus skipping (the stylus bouncing on the signal surface) may occur and damage the disc. Depending on the extent of this damage, the signal may be completely lost, or new damage may occur when the needle passes through the damaged area again.

As in the conventional example described above, when an integrally formed rigid turntable is used, it is weak against vibrations and shocks applied from the outside, and has a smooth surface that is suitable for recalibration. When the rotation of the motor rapidly rises or falls, the disk will be supported by metal chips on the turntable, making it unstable and causing abnormal noise.

The present invention 8A solves all of the above-mentioned conventional problems, and by improving the turntable of the disc playback device, it increases the support capacity of the disc, particularly increases the resistance to external vibration and shock, and also improves the disc playback capacity. The purpose of this is to prevent slippage, prevent loss of the disk IM', and stabilize signal reproduction.

Means for Solving the Problems In order to achieve the above object, the turntable of the present invention has a base made of a hard material and an outer edge member made of a soft material at the outer edge of the base. It is something. Further, it is also possible to provide a structure in which an uneven anti-slip surface is formed on the disk water discharging surface of the outer edge member.

Function: With the above-described configuration, the outer circumferential portion of the disk is supported by the soft member (outer edge member) of the turntable, so that this acts as a cushioning material, and vibrations and shocks applied from the outside are absorbed by the turntable. It is difficult for the light to propagate to the disk, and interference between the turntable and the disk is reduced.

Further, the outer circumferential portion of the disk is supported on a non-slip stop having an uneven shape on the outer edge member of the turntable, so that the disk does not slip on the turntable due to rapid rises and falls of rotation.

EXAMPLE Hereinafter, a turntable according to an example of the present invention will be described with reference to the drawings.

FIG. 1 is a plan view showing a turntable according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line X-X in FIG. 1, and FIG.
FIG. Further, FIG. 4 is a @ side view showing a state in which a disk is placed on a turntable according to an embodiment of the present invention.

Reference numeral 13 denotes a base made of a hard material (die-casting or hard resin), which has a flange surface 13a for attachment to a rotational drive device (motor) and a hole 1 for centering.
3b, and a support surface 130 having a certain width necessary for supporting the inner peripheral side of the disk is formed concentrically on the upper surface of the expanded disk. Reference planes 13d and 1 necessary for forming the member 14
3e are formed concentrically on the top and bottom surfaces of the board.

The reference surface 13d is a surface that has the same height as the disk support surface on the outer peripheral side of a conventional turntable, and the reference surface 13θ formed on the back side has a constant level with respect to the reference surface 13d on the thorn side. Maintains thickness accuracy.

14 is an outer edge member made of a soft material (rubber, thermoplastic elastomer, etc.); reference surface 1 at the outer edge of the base body 13;
3d and 13e, and surfaces 14a and 14b are formed concentrically with a constant width. The surface 14a of the outer edge member 14 is a surface for supporting the outer peripheral side of the disk, and is therefore formed on the same surface as the reference surface 13d of the base body 13. In this embodiment, the reference surfaces 13d and 13e of the base body are
Although we are considering forming the outer edge member using a mold based on
If the height of a can be maintained at a predetermined height, the reference surfaces 13d and 13e of the base are not necessary.

From the base body 13 there is a further expanded portion 131'f, and a hole 13g is partially provided in the portion 13f.
These have the function of mechanically fixing the outer edge member 14.

The disk 2 is placed on a turntable as shown in FIG. 4, and the outer periphery of the disk 2 is supported on the outer edge member 14. The surface 14a of the outer edge member 14 is formed with fine irregularities or fine knurls formed radially, and also functions to prevent the disk from slipping.

As described above, according to this embodiment, the outer edge member 14 made of a soft material is attached to the outer edge of the base body 13 made of a hard material.
By providing this, the turntable and the disk 2 are less likely to interfere with each other due to external force at the outer periphery, and transmission of vibrations and shocks M from the turntable to the disk 2 can be reduced. The anti-slip provided on the support surface of the outer edge member 14 can prevent the disk 2 from slipping due to rapid startup or fall of rotation.

Note that the same effect can be obtained by forming the support surface 13C on the inner peripheral side of the base body 13 from a soft material.

Effects of the Invention As described above, the present invention includes a turntable that supports a disk, which includes a base made of a hard material and an outer edge member made of a soft material, and the disk supporting surface of the outer edge member is provided with projections and depressions. In particular, it is possible to enhance the supporting capacity of the disk, particularly to increase its resistance to external vibrations and shocks, to prevent the disk from slipping, to prevent damage to the disk, and to stabilize signal reproduction.

[Brief explanation of drawings]

FIG. 1 is a plan view showing a turntable in an embodiment of the present invention, FIG. 2 is a sectional view taken along the line X-X in FIG. 1, FIG. 3 is an enlarged view of the main part of FIG. 2, and FIG. 4 is a sectional view showing a state in which a disc is placed on a turntable according to an embodiment of the present invention;
FIG. 6 is a plan view showing an example of an information signal regeneration device, FIG. 6 is a sectional view of the front view of FIG. 5, and FIG. Figure 8 is a plan view showing a conventional turntable, and Figure 9 is Y-Y of Figure 8.
It is an arrow sectional view. 2...Information recording disk (disc), 13...
... Base body, 14 ... Outer edge member. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Fig.2

Claims (2)

[Claims] (1) It has a base made of a hard material, on which the information recording disc is mounted and driven to rotate, and an outer edge member made of a soft material and supporting the outer edge of the information recording disc on the outer edge of the base. A turntable characterized by: (2) The turntable according to claim 1, wherein an uneven shape is formed on the information recording disk supporting surface of the outer edge member.