JPH0624058Y2 - Disc cartridge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention provides an optical disc having a signal recording layer formed on a disc substrate made of synthetic resin in a cartridge body formed by butt-joining upper and lower halves. The present invention relates to a stored and configured disk cartridge.

[Conventional technology]

Conventionally, there has been proposed a disc cartridge in which an optical disc having a signal recording layer formed on a synthetic resin disc substrate is rotatably housed in a cartridge body formed by butting and coupling upper and lower halves.

The optical discs stored in this disc cartridge are
A signal recording layer is deposited on a disc substrate formed by molding a synthetic resin material such as a polycarbonate resin having optical transparency, and an aluminum layer as a reflective film is deposited on the signal recording layer. A protective film of synthetic resin is formed to cover the aluminum layer. In the optical disc configured by using the disc substrate of the light transmissive synthetic resin as described above, when dust or the like adheres to the signal recording area in which the signal recording layer is formed, the light transmissivity is hindered and the information signal When recording and / or reproducing, an information signal is lost, and good recording / reproducing characteristics cannot be maintained.

Therefore, in order to prevent dust and the like from adhering and prevent scratches, the optical disc is stored and handled in a disc cartridge.

By the way, since the optical disk housed in the disk cartridge is rotatably housed in the cartridge body, there is a risk that the signal recording surface may be scratched by sliding contact with the cartridge body during transportation or the like. .

In order to prevent such scratches on the signal recording surface, a protruding disc support portion is provided on the inner peripheral surface of the cartridge body,
The disc supporting portion supports the non-recording portion on the inner peripheral side of the optical disc so that the signal recording surface of the optical disc and the inner peripheral surface of the cartridge body do not come into sliding contact with each other.

[Problems to be solved by the device]

By the way, the cartridge body that stores the optical disc is
It is made of a synthetic resin having a good hardness and a high hardness, which has a sufficient mechanical strength, such as an ABS resin. on the other hand,
In an optical disc, a disc substrate on which a recording layer is provided is formed of a synthetic resin such as a polycarbonate resin in consideration of optical characteristics such as light transmittance, moisture absorption resistance and heat resistance.
A synthetic resin such as a polycarbonate resin forming the disk substrate has a lower hardness than a synthetic resin such as an ABS resin forming the cartridge body. Further, the protective layer which is provided so as to cover the signal recording layer, that is, which is provided on the outermost peripheral surface of the optical disc, is also made of the same material as the disc substrate in consideration of adhesion to the disc substrate and the like. Therefore, due to the sliding contact between the disc support portion provided in the cartridge body and the optical disc, the optical disc side is scratched by abrasion. The scratches have a ring shape corresponding to the disk supporting portion, for example.

Then, shavings are generated when scratched due to this abrasion, and the shavings light adheres to the signal recording surface of the disc. As a result, the optical characteristics of the optical disc may be deteriorated, and an error in recording and / or reproducing the information signal may occur when recording and / or reproducing the information signal.

In addition, since the scratched portions that occur on the optical disc while being housed in the cartridge body are concentrated at the positions corresponding to the disc support portion, there is a risk that deep grooves will be generated due to the scratches, and the strength of the optical disc will be reduced. It deteriorates.

Therefore, the present invention prevents scratches on the optical disc housed in the cartridge body and prevents generation of shavings resulting from the scratches, thereby preventing an error in recording and / or reproducing an information signal. It is proposed for the purpose of providing a disc cartridge.

Furthermore, the present invention makes it possible to use a synthetic resin material that constitutes the optical disc and a synthetic resin material that constitutes the cartridge body that accommodates this optical disc that can guarantee the characteristics required for each, and perform recording / reproduction. An object of the present invention is to provide an optical disc having good characteristics and a highly reliable disc cartridge which ensures protection of the optical disc.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the disk cartridge according to the present invention is provided with a signal recording layer on a disk substrate made of synthetic resin, and covers the signal recording layer to cover the synthetic resin. An inner periphery of the optical disc on the inner surface side of the cartridge body, the optical disc having a protective film formed thereon and a cartridge body formed by butt-joining the upper and lower halves to rotatably accommodate the optical disc. Side of the optical disc, a disc supporting portion for supporting the optical disc is provided in a protruding manner, and a non-recording portion of the optical disc is provided with a self-lubricating and wear-resistant slip ring fixedly arranged. It has been configured.

[Action]

In the disc cartridge according to the present invention, the disc supporting portion provided on the inner peripheral side of the cartridge body and the sliding ring disposed on the non-recording portion of the optical disc are slidably contacted with each other to the inner surface of the cartridge body in the signal recording area of the optical disc. Contact is prevented.

Further, the contact between the disk support and the sliding ring prevents the disk substrate and the synthetic resin protective film provided on the disk substrate from contacting the cartridge body.

〔Example〕

Hereinafter, a specific embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 2, the disc cartridge according to the present invention is formed by abutting upper and lower halves 3 and 4 each having a rectangular shape and connecting and fixing them by a plurality of screws 5. The cartridge main body 2 is provided. The optical disk 1 is rotatably housed in the cartridge body 2.

The upper half 3 and the lower half 4 of the cartridge main body 2 record and / or record information signals such as optical pickups for recording information signals on the optical disc 1 or reproducing the recorded information signals. Openings 6 and 7 facing the reproducing means are provided, and a slide type shutter 8 for opening and closing the openings 6 and 7 is attached.

Upper half 3 and lower half 4 constituting the cartridge body 1
Is molded from a synthetic resin having a good hardness and a sufficient hardness and a sufficient hardness, such as an ABS resin. When the upper half 3 and the lower half 4 are butt-joined to each other, the upper half 3 and the lower half 4 form a space enough to rotatably accommodate the optical disk 1 therein. Standing walls 9 and 10 that form a peripheral side wall of the cartridge body 2 are formed by butt-joining at the peripheral edge, and a position regulating wall that regulates the horizontal position of the information disc 1 to be housed is formed on the inner wall surface. At the same time, a plurality of arc-shaped ribs 12 forming the disk housing portion 11 are provided so as to protrude in a circumferential shape slightly larger than the outer diameter of the optical disk 1. In addition, an auxiliary rib 13 is provided on the inner peripheral side of the arc-shaped rib 12 so as to narrow the gap between the disc housing portions 11 and support the outer peripheral edge of the optical disc 1 as needed. Further, the openings 6 and 7 exposed by information signal writing / reading means such as an optical pickup are located on the upper and lower surfaces of the cartridge main body 2, that is, from the center of the upper half 3 and the lower half 4 to which the shutter 8 is attached. It is formed in a substantially rectangular shape over the entire length of the cartridge body 2 so that the portion of the optical disk 1 housed in the cartridge body 2 from the vicinity of the outer peripheral end to the center portion can be exposed to the outside of the cartridge body 2. By forming the openings 6 and 7 as described above, the information signal writing / reading unit can scan the inner and outer circumferences of the optical disc 1, and the disc table on the recording / reproducing apparatus side for rotating the optical disc 1 can also be formed with these. The optical disk 1 can be supported by entering the cartridge body 2 through the openings 6 and 7.

Then, at the peripheral edge of the central portion of the openings 6 and 7 into which the disc table enters, at a position corresponding to the non-recording portion of the inner peripheral portion of the optical disc 1 housed in the cartridge body 2. Are provided with disk support portions 14 and 15 for supporting the information disk 1, which are projected in a substantially ring shape.

As described above, the disc support portion 1 that supports the plurality of arc-shaped ribs 12 that form the disc storage portion 11 on the inner wall surface side and the portion corresponding to the non-recording portion of the inner peripheral side portion of the optical disc 1.
The upper half 3 and the lower half 4 provided with 4, 15 are adapted to house the optical disk 1 in the disk housing 11, and screw fixing parts 16 provided at the four corners of the respective halves 3, 4. And 17 are abutted against each other, and screws 5 are screwed between the screw stoppers 16 and 17 so as to be coupled and fixed, and the information disc 1 is rotatably accommodated.

Further, a slide type shutter 8 is formed on the cartridge main body 2 by bending a thin metal plate such as a stainless steel plate for opening and closing the openings 6 and 7 provided on the cartridge main body 2 into a substantially U shape. A disk cartridge is constructed by mounting.

The optical disc 1 housed in the cartridge body 2 of the disc cartridge constructed as described above is constructed as shown in FIG.

That is, in the optical disc 1, recording layers for information signals are provided on the disc substrates 1a and 1b made of a constituent resin having optical transparency and excellent in optical characteristics, for example, transparent polycarbonate resin, and the recording layers are formed on the recording layers. A reflection film of aluminum is formed, and two so-called double-sided types in which two reflective films are covered with a synthetic resin film for protection and which are joined together. The protective synthetic resin film is formed of the same or the same kind of synthetic resin material as that of the disk substrates 1a and 1b.

When joining the two disk substrates 1a and 1b, the protective synthetic resin film is joined so as to face the outside.

At the center of the optical disc 1, there is provided an insertion hole 20 through which the center spindle of the recording / reproducing apparatus that drives the optical disc 1 to rotate is inserted.

Hubs 24 each having a center hole 21 for inserting a center spindle on the recording / reproducing apparatus side at the centers of the insertion holes 20 are attached to the central portions of the upper and lower surfaces of the optical disc 1.

The hub 24 is composed of a metal plate 23 having the center hole 21 formed in the center thereof, and a mounting ring 22 for mounting the metal plate 23 on the information disc 1. Thus, the metal plate 23 is incorporated in the hub 24 so that the information plate 1 can be held by attracting and holding the metal plate 23 by a magnet or the like provided on the disk table on the recording / reproducing apparatus side. This is because it is fixed on top.

As the metal plate 23, for example, a chromium-plated iron plate, a magnetic stainless plate, or the like is suitable. Such a metal plate 23 is formed into a circular shape by press punching, and the peripheral edge portion is bent to form a flange portion 25.

Next, the attachment ring 22 is formed of a synthetic resin in an annular shape, and fixes the flange portion 25 provided on the peripheral portion of the metal plate 23 in a buried shape by, for example, an insert molding method or the like. By the hub 24
It is what constitutes. The resin material of the mounting ring 22 is the optical disk 1 of the mounting ring 22.
It is preferable to use the same or similar material as the disk substrates 1a and 1b in order to ensure the bonding corresponding to the disk substrates 1a and 1b constituting the disk. That is, when the resin material of the disk substrates 1a and 1b is, for example, a polycarbonate resin, it is desirable that the mounting ring 22 is also formed of a polycarbonate resin.

Next, on the outer peripheral portion of the surface of the hub 24 composed of the mounting ring 22 and the metal plate 23 facing the optical disc 1 as described above, that is, on the outer edge of the lower end side of the mounting ring 22, a sliding ring described later is formed. A step portion 32 for sandwiching the optical disc 1 and the optical disc 1 is provided in an annular shape.

The slip ring 30 is provided on the inner wall surface side of the cartridge body 2, and the disk support portions 14 and 15 for supporting the non-signal recording area portion on the inner peripheral side of the optical disk 1 cannot directly contact the optical disk 1. To do so. That is, the slidable ring 30 is provided as a ring member having a diameter larger than the diameter of the mounting ring 22 of the hub 24, and the inner peripheral side thereof is a step portion 32 formed on the outer edge of the lower end side of the mounting ring 22. Is attached to the optical disc 1 by being sandwiched between the hub 24 and the disc substrates 1a and 1b, and the outer peripheral sides thereof are extended to the positions corresponding to the disc supporting portions 14 and 15 of the cartridge body 2, respectively. It will be.

As a material of the slip ring 30, a resin having self-lubricating property and good wear resistance is preferable, and for example, polyacetal resin is desirable.

As shown in FIG. 3, the slip ring 30 is sandwiched between the mounting ring 22 of the hub 24 and the optical disc 1 to be mounted.

That is, a mounting portion 26 for mounting the optical disc 1 is provided inside the step portion 32 on the lower end surface of the mounting ring 22 of the hub 24. The attachment portion 26 has two absorption grooves 3 concentrically centered on the center O of the hub 24.
4, 35 are formed, and melting ribs 36 serving as welding portions are formed between the two absorption grooves 34, 35. Then, the slippery ring 30 is attached to the attachment ring 22.
After being fitted to the step portion 32 formed on the outer edge on the lower end side of the disk, and sandwiched between the mounting ring 22 and the optical disk 1, ultrasonic waves are applied to the melting rib 36 to melt the melting rib 36. , The hub 24 is fused to the optical disc 1.

When the melting rib 36 is melted and the hub 24 is attached to the optical disk 1, the excess of the melted resin escapes to the absorption grooves 34 and 35, so that the flat surface between the optical disk 1 and the hub 24. You can keep the degree.

Although not described in this embodiment, the absorption groove may be provided on the disk substrate side.

In the optical disc 1 thus formed, the slippery ring 30 is fixed only by being sandwiched between the hub 24 and the optical disc 1, and the fixing does not require adhesion or welding. The material of the ring is not limited to a material that can be bonded or welded, and various materials can be used. Therefore, the polyacetal resin having the above-mentioned self-lubricating property and good abrasion resistance can be used as the material of the slip ring.

[Effect of device]

As described above, the disc cartridge according to the present invention is
Since the disc support portion provided on the inner surface side of the cartridge main body and the sliding ring arranged on the non-recording portion of the optical disc are in sliding contact with each other, the direct contact between the cartridge main body and the optical disc is prevented. Therefore, it is possible to prevent scratches due to the sliding contact between the cartridge body and the optical disk and generation of shavings caused by the scratches.

Further, since it is possible to prevent the generation of the shavings, it is possible to prevent the deterioration of the recording / reproducing characteristics of the optical disc due to the shavings.

Further, since it is possible to prevent the optical disc itself from being scratched, there is no possibility that a deep groove is generated due to the scratching, and the strength of the optical disc can be sufficiently ensured.

In particular, since the slidable ring is fixedly mounted on the optical disc, it always moves together with the optical disc, and no sliding contact occurs between the slidable ring and the optical disc, so that abrasion of the optical disc can be reliably prevented. .

Furthermore, since a slippery ring is provided on the optical disc itself so as to prevent the optical disc from being scratched, the synthetic resin material that constitutes the optical disc and the synthetic resin material that constitutes the cartridge body that accommodates this optical disc It is possible to use those that can guarantee the characteristics required for each, and it is possible to configure an optical disk having excellent recording / reproducing characteristics and a highly reliable disk cartridge that ensures protection of the optical disk.

[Brief description of drawings]

1 is an exploded perspective view showing an optical disc constituting the present invention, FIG. 2 is an exploded perspective view showing a disc cartridge according to the present invention, and FIG. 3 is a state in which an optical disc is housed in a cartridge body. FIG. 1 ... Optical disc 1a, 1b ... Disc substrate 2 ... Cartridge body 3 ... Upper half 4 ... Lower half 14, 15 ... Disc support 22 ... Mounting ring 24 ... Hub 30 ... Sliding ring

Claims (1)

[Scope of utility model registration request] 1. An optical disc formed by providing a signal recording layer on a disc substrate made of synthetic resin, and covering the signal recording layer with a synthetic resin film, and an optical disc formed by butt-joining upper and lower halves. A cartridge body that is rotatably accommodated, and a disc support portion that supports the optical disc is provided at a position corresponding to a non-recording portion on the inner peripheral side of the optical disc on the inner surface side of the cartridge body, and A disc cartridge in which a non-recording portion of an optical disc is fixedly provided with a self-lubricating and wear-resistant sliding ring.