JPS6020203Y2 - Signal recording disc protection device - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to a protection device for a signal recording disc used in a signal recording disc reproducing device to prevent defects due to contact between the signal recording portion of the main body of the signal recording disc and the jacket.

[Technical background of the invention and its problems]

In recent years, video signals have been recorded on a spiral recording line of a signal recording disk body (hereinafter referred to as a disk), and this is placed on a turntable and rotated, while a pick-up needle is attached to the recording line. A signal recording disc reproducing device has been developed that reproduces signals by slidingly contacting the discs.

Such signal recording disk reproducing apparatuses are being developed in such a way that their operation can be controlled automatically by simply operating an operating switch or the like.

However, in a signal recording disc reproducing apparatus, manual intervention is required for some operations, such as replacing the disc, and this type of operation is likely to result in improper handling or failure.

Therefore, a signal recording disc playback device that can automatically place a disc on a turntable is also needed to prevent mishandling or failures that may occur during disc replacement work, and consequent dirt on the disc. It is being developed.

In such a signal recording disc playback device equipped with an automatic disc attachment/detachment mechanism, it is desirable that the disc be housed in a cover, such as a jacket, to prevent it from touching fingers, and that this jacket can be inserted and removed from the main body of the signal recording disc playback device. .

However, on the other hand, it has the disadvantage that there is a concern that the signal recording portion of the disk may be damaged due to contact between the disk on the flat plate and the jacket when the disk is inserted into and removed from the main body of the playback device.

[Purpose of invention]

This idea was made to deal with the above situation, and it not only protects the signal recording section of the disk, but also reduces uneven rotation of the disk, thereby providing signal recording that can contribute to obtaining a stable video screen. The purpose is to provide a disc protection device.

[Summary of the idea]

A convex portion is formed in the signal non-recording portion provided at the center and outer peripheral edge of the recording disk body.

[Example of idea]

Embodiments of the signal recording disk according to the present invention will be described below with reference to the drawings and FIGS. 1 to 3.

FIG. 1 is a perspective view illustrating the outline of the present invention, FIG. 2 is a perspective view showing a signal recording disk of the present invention, and FIG. 3 is a perspective view showing another example.

First, the outline of the signal recording disk storage device according to this invention will be explained with reference to FIG.

In the figure, numeral 3 indicates the signal recording disk body, that is, the disk.

The disk 11 is housed in a disk protection plate 12, which is generally made of paper or synthetic resin, so that it can be easily inserted into and removed from the jacket 11, which will be described later.

This disk protection plate 1 has a disk protection portion 14 in the center thereof, which is a circular through-hole having a diameter larger than the diameter of the disk plate.

It is possible to accommodate the disk in this protection part 14.

Furthermore, this disc protection plate 12 can be stored in the jacket 13.

This jacket U has a rectangular thin box shape and has an opening 15 and a storage section 16.

Therefore, the disk protection plate (1) can be inserted through this opening 15.

Further, the disc protection plate U is configured to close the opening 15 of the jacket 11 when inserted into the jacket 13, and has a locking portion 18 approximately at the center of the side 17 that closes the opening 15. .

This locking portion 18 can contribute to automatic attachment and detachment of the disk to and from the turntable.

Next, the above-mentioned disk will be explained in further detail with reference to FIGS. 2 and 3.

That is, in FIG. 2, 11 is the disk shown in FIG. 1 above.

The disk has a locking hole 21 in its center, which is a circular hole for coaxially placing the disk on the turntable.

Further, on the upper surface of the disk, a signal non-recording area 22 is provided at the peripheral edge of the locking hole so as to surround the locking hole 21.
has.

Similarly, there is a signal non-recording area 2 on the outer peripheral edge of the disc.
It has 3.

A signal recording portion 24 is provided between the signal non-recording portion 22 of the locking type peripheral portion and the signal non-recording portion 23 of the outer peripheral portion.

Continuously protruding convex portions are formed in the signal non-recording portion 22 of the locking type peripheral edge portion and the signal non-recording portion 23 of the outer peripheral edge portion of the disk.

The convex portion formed in the signal non-recording portion 22 of the locking type peripheral portion and the convex portion formed in the signal non-recording portion 23 of the outer peripheral edge portion are set on the same plane.

Therefore, the signal recording sections 22 and 23 are thicker than the signal recording section 24, and the signal recording surface is set below the signal recording section surface.

Although the convex portions formed in the signal non-recording portions 22 and 23 of the disk 11 have been described only on the upper surface, they are similarly formed on the lower surface.

According to the above configuration, when the disc 11 is inserted into or removed from the jacket 13 via the disc protection plate 1, the portion where the jacket 1 and the disc come into contact is the opening 15 of the main jacket 1. In response to deflection in the vicinity, the jacket 11 contacts the non-signal recording area 23 on the outer peripheral edge of the disc, and if there is deflection in the vicinity of the housing section 16 of the jacket U, the peripheral edge of the locking hole of the disc 11 contacts. Since it comes into contact with the signal non-recording section 22 and does not come into contact with the signal recording section 24, the signal recording section 2
Damage to the signal recording section 24 due to friction between the signal recording section 4 and the jacket 13 can be prevented.

It should be noted that this invention is not limited to the above-described embodiments, and it goes without saying that various modifications can be made without changing the gist of this invention.

For example, the disk 31 shown in FIG.
In the case where discontinuous protrusions are formed, the same effect as in the embodiment shown in FIG. 2 can be obtained.

Further, the discontinuous convex portion may have a large number of small protrusions with rounded tips instead of having a flat surface as shown in FIG.

Note that 34 in FIG. 3 is a signal recording section.

In the embodiment of this invention described in FIG. 3, the convex portions formed on the non-signal recording area of the disk have been described only on the upper surface of the disk, but they are also formed on the lower surface of the disk.

The mechanism for attaching and detaching the disc to the turntable is disclosed in a patent application filed in 1973 by the applicant.
2-75007 in detail.

[Effect of idea]

As explained above, according to the present invention, by forming continuous or discontinuous convex portions in the non-signal recording area of the disk,
A step is provided between the signal recording section and the signal non-recording section, and since the signal non-recording section of the disk is the only part that comes into contact with the disk, the signal recording section of the disk is not damaged.

In addition, when the disc is placed on the turntable, the part where the turntable and the disc come into contact is only the non-signal recording area, so it is possible to suppress the generation of static electricity due to friction between the turntable and the disc, and the contact between the turntable and the disc is suppressed. Dust adsorption can be reduced.

Furthermore, the continuous or discontinuous convex portions formed in the non-signal recording area on the outer periphery of the disc increase the weight of the outer periphery of the disc, so when the disc is placed on a turntable and rotated. Since the moment of inertia of the disk increases, uneven rotation can be reduced.

In addition, the thickness of the outer circumferential edge of the disk increases due to continuous or discontinuous convex portions of the signal-free area on the outer circumferential edge of the disk, so when the disk is stored by inserting the empty jacket through the insertion slot, There is an advantage that the opening of the jacket and the disk protection plate containing the disk can be fitted more smoothly.

[Brief explanation of drawings]

FIG. 1 is a perspective view illustrating the outline of the present invention, FIG. 2 is a perspective view showing a signal recording disk of the present invention, and FIG. 3 is a perspective view showing another example. 11, 31---One signal recording disk, ■...
... Jacket, 15 ... Opening, 22.23
．． 32.33, ... Signal no recording section, 24, 34
．． ...Signal recording section.

Claims (1)

[Scope of utility model registration request] A signal recording device that includes a thin box-shaped jacket having an opening, a non-signal recording section inserted into the jacket at the center and outer periphery, and a signal recording section between these non-signal recording sections. A protection device for a signal recording disk, characterized in that a disk body and a convex portion are provided on the signal non-recording portion of the signal recording disk body to prevent contact between the signal recording portion and the jacket.