JPS619801A - Turntable - Google Patents

Abstract

PURPOSE:To enhance the supporting capability of an information recording disc and to improve especially the resistance to external oscillation and shock by constituting elastically the outside peripheral part of a turntable, which the outside peripheral part of the information recording disc faces and is supported, independently of the base body of the turntable. CONSTITUTION:A disc groove guard supporting member 22 formed with an elastic member such as rubber or the like is supported elastically in cantilever on the outside peripheral part of a turntable base body 21. A groove guard part 23a of a disc 23 is allowed to face this supporting member 22 and is supported on this member 22. The disc groove guard supporting member 22 is formed with the elastic member such as rubber or the like or the disc groove guard supporting member 22 is provided through an elastic supporting body so that it is difficult that oscillation generated on the base body of the turntable, oscillation due to an acoustic pressure received by the surface, etc. are transmitted to the disc 23.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention is an information signal reproducing device such as an audio player or a video disc player, in which a disc on which information is recorded (hereinafter referred to as an information recording disc or disc) is mounted. It concerns turntables.

Configuration of conventional examples and their problems Normally, an information signal reproducing device includes a rotation drive unit that supports and rotates an information recording disk, a detection unit that detects a signal from the information recording disk, and a seasoning for the detected signal. It consists of a signal processing section, and a mechanism section that moves the detection section and raises and lowers the information recording disk.

FIGS. 1 and 2 show the overall configuration of an example of an information signal reproducing apparatus, and FIG. 3 shows the configuration of a signal detecting section of the information signal reproducing apparatus. In this example, a needle contact type video disc player is used, and the turntable is constructed using a conventional type. First, in Figures 1 and 2, (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, and (7) is a cartridge. ) is the clamp, (8) is the roller, (9) is the shaft, (10) is the rail, (11) is the base, (
12) is a motor, and (13) is a leg. In FIG. 3, (14) is a needle, (15) is a lead, (16) is a cantilever, and (17) is a suspension. Incidentally, an example of a conventional turntable (1) is shown in FIGS. 4 and 5.

Conventional turntables are often die-cast or resin molded products, and their structure includes a flange surface (1a) for attaching to a rotation drive device and a hole (1a) for centering.
b), and the upper surface of the disc-shaped/expanded disc has a supporting surface (with a certain width necessary to support the information recording disc).
1c) are formed concentrically on the outer and inner peripheries.

On the other hand, the information recording disk [disk (2)] has a concentric part formed on the outer and inner sides of the area where the signal is recorded (signal surface) that is higher than the signal surface. It is supported by the support surface of the turntable mentioned above.

The information recording disk is centered by a center boss and placed on the turntable, and the vicinity of the center hole is pressurized to increase the degree of contact with the turntable.

Information recording disks are mainly made of resin materials.
It itself has waviness (surface runout) in the thickness direction, and if there is excessive surface waviness on the signal surface, it will exceed the tracking capability of the signal detector and cause problems in reproduction. 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, when the entire reproducing apparatus is vibrated or an impact is applied from the outside, these forces or vibrations are propagated to the information recording disk, increasing the amount of one-plane runout. In the conventional case, the turntable is a rigid body integrally formed of metal or resin, and it easily propagates vibrations and shocks applied from the outside, and the natural frequency of the vibration generated by this is the same as the unique frequency of the information recording disk. higher than the frequency. If the information recording disk is warped and its 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 the outside. The high-frequency vibrations of the turntable generated by the vibrations and shocks transmitted are transmitted to the information recording disk, and appear as large-amplitude vibrations on the information recording disk. On the other hand, when the information recording disk vibrates due to vibrations or shocks applied from the outside, if the contact with the turntable is partial or if the applied pressure is not sufficient, the reaction from the turntable will cause the disk to vibrate violently. In other words, the information recording disk and the turntable interfere with each other due to vibrations and shocks applied from the outside, especially at the outer periphery, and high-frequency and large-amplitude vibrations are applied to the information recording disk. Combined with the surface runout of the disc itself, this exceeds the tracking limit of the detector, causing trouble in playback. Further, especially in the case of a needle contact type information signal reproducing device, needle skipping (the needle bouncing on the signal surface) may occur, which may damage the information recording disk. 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. When an integrally formed rigid turntable is used, as in the conventional example described above, it is vulnerable to vibrations and shocks applied from the outside, which tends to impede good signal reproduction.

Purpose of the Invention The present invention solves the above-mentioned conventional problems, and improves the turntable of an information recording disc playback device to increase the supporting capacity of the information recording disc and, in particular, to improve the resistance to external vibrations and shocks. The purpose is to prevent damage to the information recording disk and stabilize signal reproduction.

Structure of the Invention In order to achieve the above object, the turntable of the present invention has the following features:
This is a turntable on which an information recording disk is placed and rotated, and the outer circumferential portion of the information recording disk, on which the outer circumferential portion of the information recording disk is opposed and supported, is configured to be elastic with respect to the turntable base.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on the drawings.

First, a first embodiment shown in FIGS. 6 to 8 will be described. (21) is a turntable base, and a disk group guard support member (22) formed of an elastic member such as rubber is elastically supported in a cantilever on the outer periphery of the turntable base (21). The group guard portion (23a) of the disk (23) is supported on the support member (22) so as to face each other.

9 to 13 respectively show other different embodiments, and the embodiment shown in FIG. It supports a disk group guard support member (22a) made of an elastic member such as rubber and having the same thickness as the turntable base (21a).

Further, the embodiment shown in FIG. 10 has a turntable base (21
b) A disk group guard support member (22b) formed of an elastic member such as rubber is supported so as to fit around the outer periphery of the disk group guard support member (22b).

Further, the embodiment shown in FIG. 11 has a turntable base (21
c) A disk group guard support member (2) made of an elastic material such as rubber so as to cover the upper surface including the outer periphery of the
2c).

Further, the embodiment shown in FIG. 12 has a turntable base (21
A disk group guard support member (22d) made of an elastic member such as rubber is provided so as to cover the upper and lower surfaces including the outer periphery of the disk group d).

Furthermore, the embodiment shown in FIG. 13 has a turntable base (21
A disk group guard support member (22e) is provided on the outer periphery of the disc group guard (22e) via an elastic support (24).

As described above, the turntable according to the embodiment of the present invention is designed so that vibrations generated in the turntable base (20) (20a) to (20e) and vibrations due to sound pressure received on the surface are difficult to be transmitted to the disk (23). The disc group guard supporting members (22) (22a) to (22e) are provided with an elastic member such as rubber, or via an elastic support member (24). Further, it is also possible to design the device to increase the blocking effect against vibrations of high frequency components that are unnecessary especially for disc reproduction. Furthermore, it is effective in suppressing the vibration of the disk due to mutual interference between the disk and the turntable, which has been a problem in the past, and it also extremely effectively suppresses unnecessary vibration of the disk due to external vibrations and shocks. be able to.

Effects of the Invention As described above, according to the present invention, it is possible to suppress vibrations (particularly surface runout) on the signal playback surface of the disk due to external vibrations and shocks, thereby enabling stable tracking of the signal detector to the disk. This allows stable signal reproduction.

In addition, in the case of the needle contact type playback method, needle skipping is suppressed, and as a result, damage to the disc due to needle skipping is less likely to occur.
This dramatically improves stability and reliability.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway plan view showing an example of an information signal reproducing device, Fig. 2 is a longitudinal cross-sectional view of the same, Fig. 3 is a perspective view showing an example of a signal detection section, and Fig. 4 is a conventional turntable. 5 is a sectional view taken along the line xx in FIG. 4, and FIGS. 6 to 8 show the first embodiment of the present invention, FIG. 6 is a plan view, and FIG. FIG. 8 is an enlarged view of the main part of FIG. 7, and FIGS. 9 to 13 are sectional views showing other different embodiments of the present invention. (21) (21a) to (21e)... Turntable base, (22) (22a) to (22e)... Disc group guard support member, (23)... Disc, (
24)...Elastic support agent Yoshi Morimoto
Figure 1 Figure 2 Figure 3 Figure 1 Figure 7 Figure 8 Figure 9 Figure 70

Claims (1)

[Claims] 1. A turntable on which an information recording disk is placed and rotated, the outer circumferential portion of which the outer circumferential portion of the information recording disk is opposed and supported being configured elastically with respect to the turntable base.