JPS63187481A - optical disc - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a source disk on which information can be recorded and reproduced optically, and more particularly, to a source disk with a hub suitable for optical disk clamping.

[Conventional technology]

Conventional discs include playback-only video discs (Vb), compact discs (CD), and recordable and playable optical discs (DRAW).

When loading these original disks into a recording/playback device or a playback device (hereinafter referred to as a drive), please use the
51404. As disclosed in "Introduction to CD Players JP 114゜Corona Inc.," the original disc is held by mechanically clamping the inner circle formed on the optical disc against a disc positioning turntable provided in the drive. was.

Hereinafter, the above holding mechanism will be referred to as a mechanical clamp.

10,000, as shown in Figure 1 (of the write-once discs, diameter 1
50mm t: Optical nice for recording Q code data/(
For the CD-1 (and AM), a configuration in which a Wako disk is included in the cartridge is also considered, similar to a floppy disk for magnetic recording, which simplifies the drive structure.
In addition, with the aim of saving space, a shift from the above-mentioned mechanical clamp to a magnetic chuck type clamp is being considered.

In conventional magnetic chuck type clamps, it is necessary to bond a magnetic material to a disk carrier such as a non-magnetic material, such as plastic or glass plate for PMM, PC, etc., and the bonding strength and environmental resistance reliability of the magnetic material have to be bonded. There were problems that needed to be resolved in terms of performance, disc optical properties, productivity, etc.

[Problem that the invention seeks to solve]

In the conventional magnetic material for a 1-gnet chuck, the magnet on the turntable side comes into close contact with the magnetic material, and an excessive force is generated when the disk is attached or removed. There were problems with the durability of the bond between the disk carrier and the disk carrier, and the durability of the drive side.

An object of the present invention is to solve the problems of the prior art described above and to provide an inexpensive and highly reliable source disk.

[Means to solve problems]

The above purpose is to create a hub structure in which a magnetic material is inserted into plastic, to improve adhesive bonding with the plastic substrate that is the optical disc carrier, and to attach a non-magnetic material such as a plastic film to the i-side of the magnetic material, so that the magnet and This can be achieved by adjusting the magnetizing force between the magnetic bodies to reduce the excessive vibration that occurs when attaching and detaching the disk.

[Effect]

By forming a hub structure in which the magnetic material serving as the attracting body of the magnet is insert-molded from thermoplastic resin, the bonding strength with the plastic material serving as the disk carrier can be greatly increased. That is, conventionally, an adhesive was used to join the magnetic material and the disk carrier, but this structure enables ultrasonic welding or spin welding, and the strength of the joint can be made equal to the strength of the base material.

Also, plastic film with different magnetic surfaces.

By selecting the thickness t, the relative distance between the magnet and the magnetic body can be adjusted, and the magnetic attraction force can be alleviated. By doing so, it is possible to reduce the stress applied to the joint between the knob and the disk, so that it is possible to obtain an original disk with excellent disk productivity and durability.

〔Example〕

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

1 and 2 are diagrams used to explain one embodiment of the present invention, in which 1 is a recording film capable of recording original information on an injection-molded polycarbonate replica (thickness 1.2 mm); For example, chalcogenide compound formation (approximately 1000
A′ ratio, after protective film formation, after adhesive bonding 5 (not shown),
The original disk 2, which can be used on both sides, is a hub with a lip formed by insert molding a magnetic material 6 with polycarbonate 7. 3
numeral 4 is a cartridge, and 4 is a turntable equipped with a magnet.The magnetic material 2 is connected to the magnetic chuck to position the disc.

FIG. 2.3 shows an embodiment of the present invention, in which a plastic film 8ya with an adhesive is pasted on the surface of a magnetic body 6. With this configuration, the distance between the magnet (not shown) attached to the turntable and the magnetic body 6 is kept constant, and the magnetizing force can be easily controlled. Here, instead of the plastic film, other non-magnetic materials, e.g.

It may also be a rubber material used during insert molding, for example, a coating film.

FIG. 4 is a diagram showing another embodiment of the present invention. That is, as is often used in ICs and LSIs, the magnetic body 6 is pressed into the shape of a lead frame, and after insert molding a large number of pieces at the same time, the outer periphery is finished with a W finish as shown in FIG. By doing so, a large number of rings with magnetic material can be molded at the same time, and costs can be reduced.

FIG. 6 is a diagram showing another embodiment of the invention. In other words, the original disk to which the present invention is applied is mounted in a cartridge, and its history at the time of manufacturing Dinuk cannot be easily identified. For this reason, the disc manufacturing history is printed on the surface of the rubber or plastic material with the magnetic insert.
Alternatively, it may be stamped during molding. This way'l
By doing this, it is possible to check the manufacturing history of the original disk without disassembling the cartridge.

〔Effect of the invention〕

According to the present invention, the bonding strength with the one-element disk carrier is high;
Moreover, since the magnetizing force can be controlled in a simple manner, it is possible to obtain a high quality original disk of 1 ft.

[Brief explanation of the drawing]

FIG. 1 shows an original disk according to an embodiment of the present invention. 2, 6, 4, 5, and 6 are cross-sectional views showing the overall structure of the player and cartridge, respectively, an embodiment and an embodiment of the present invention. It is a sectional view of the I-pu part shown. 1...Former Dinuk, 2...Hub. 3... Cartridge. 4... Turntable with magnet. Figure l Figure 2 Figure 3 Figure + 2

Claims (1)

[Scope of Claims] 1. An optical disc with a hub having a magnetic material serving as a rotation center hole of a double-sided bonded optical disc, characterized in that a non-magnetic material layer is laminated on the surface of the magnetic material. . 2. An optical disc characterized in that the nonmagnetic layer according to claim 1 is a plastic film bonded with an adhesive.