JPH09251748A - Disk cartridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk cartridge capable of surely protecting a disk substrate housed in a cartridge so as to be freely rotated from vibration or the like and improving production efficiency by forming the inner peripheral side of a disk supporting base higher than its outer peripheral side. SOLUTION: A disk cartridge main body 3 is composed of a pair of upper and lower halves 5 and 6 and an optical disk is housed so as to be freely rotated. In positions corresponding to the signal non-recording areas 2A and 2C of the optical disk, disk supporting base seats 21A and 21B stuck with buffer effect use supporting members 23A and 23B for reluxing impacts of the optical disk are provided. The disk supporting base seat 21A in an inner peripheral side is formed higher than the disk supporting base seat 21B in an outer peripheral side. The supporting members 23A and 23B are composed of the first layer of the disk substrate side made of an elastic body and the second layer of the cartridge main body side made of a substrate having a large bending elastic modulus.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc cartridge in which a disc capable of recording and / or reproducing an information signal is rotatably housed, and more specifically, a disc support pedestal for preventing a signal recording portion of the disc from being damaged. Disc cartridge

[0002]

2. Description of the Related Art Conventionally, a disc such as an optical disc is mounted in a predetermined cartridge in order to prevent dust from adhering to the recording and / or reproducing device when it is not used and damage from contact with other devices. It is stored.

As this disc cartridge, there has been proposed a disc cartridge which accommodates a disc having a diameter of 30 cm which is enlarged in order to achieve a high capacity of recorded information signals. This disc cartridge is used under severe usage conditions such as being automatically loaded into a recording and / or reproducing device from an accommodating portion in which a plurality of disc cartridges are accommodated by using an automatic loading device.
Therefore, the cartridge has a disc support member, which is made of a cushioning material, mounted therein for recording and / or recording.
Alternatively, it is protected from a shock when it is loaded in the reproducing apparatus and a shock when it is transported.

For example, this disc cartridge 101
As shown in FIG. 7, a disc 102 capable of recording and / or reproducing is disclosed in Japanese Utility Model Laid-Open No. 4-47805.
Is rotatably housed in the cartridge body 103.

The cartridge body 103 includes a rectangular plate-shaped upper half 104 and a lower half 105 formed of synthetic resin.
Are abutted against each other and fixed to each other by a plurality of screws 106, so that the whole is formed into a flat box shape. On the inner surfaces of the upper half 104 and the lower half 105, which face each other, arc-shaped disc storage walls 107 corresponding to the outer peripheral portions of the discs 102 are formed to form a disc storage portion. Also, a pair of upper and lower halves 104, 105
A disc table entry opening 108, which is a pair of upper and lower circular holes, is formed in the center of the disc. The recording and / or reproducing opening 109, which is a pair of upper and lower rectangular holes along the front end line side of the cartridge body 103, is provided at a position close to the opening 108 for entering the disc table.
Is formed. Then, in the cartridge body 103,
A shutter member is slidably attached while closing the recording and / or reproducing opening 109.

A pair of upper and lower halves 104, 105
On the inner surfaces facing each other, the disk storage wall 1
There are disc support members 110 (110A, 110B) on the inner peripheral side of 07 and the outer peripheral side of the disc table entrance opening 108, which have a cushioning effect to soften the impact on the disc such as loaded in the recording and / or reproducing apparatus. It is arranged at a predetermined interval.

As shown in FIG. 8, the disk support member 110A is a cushioning material 111A made of a circular elastic material.
And this cushioning material 111A is used for the upper half 104 and the lower half 1.
And a mounting piece 112 formed of a highly rigid sheet metal, which is mounted on each of the parts 05. The cushioning material 111A is
It is insert-molded in the center of the mounting piece 112.

The disk supporting member 110B is shown in FIG.
As shown in FIG. 3, since the buffer table 111 B is provided between the disc table entry opening 108 and the recording and / or reproducing opening 109, a band-shaped cushioning material 111 B is attached.
Insert-molded in the center of.

The disk supporting member 1 thus constructed
10 is a mounting hole 113 formed at both ends of the mounting piece 112.
The caulking pins are inserted and caulked to be attached to the upper and lower halves 104, 105 at predetermined positions on the opposing surfaces.

[0010]

However, as described above, since the disk support member 110 is molded by insert molding the cushioning material 111 into the mounting piece 112, the mounting piece 112 is placed in the cavity of the molding die. A lot of time is required because the positioning work, the releasing work for separating from the runner when releasing from the molding die, the work for crimping the mounting piece 112 to the inner surface of the cartridge, and the like must be performed manually. Was done.

Further, when the disk supporting member 110 is caulked, if a projection or the like is formed on the surface of the disk supporting member 110 due to defective molding, the disk 102 housed in the cartridge body 103 may be scratched. Therefore, the disk cartridge 101 needs to be repaired when the protrusions or the like occur, and the production efficiency cannot be improved.

Therefore, an object of the present invention is to provide a disk cartridge which can protect the disk substrate rotatably housed in the cartridge from vibrations and the like and can improve the production efficiency.

[0013]

In order to solve the above-mentioned problems, a disk cartridge according to the present invention is provided with a signal recording area in which an information signal is recorded and a center formed on the inner peripheral side of the signal recording area. A disc-shaped recording medium having an inner peripheral side non-signal recording area in which an information signal for forming a hole is not recorded, and an outer peripheral non-signal recording area in which an information signal formed on the outer peripheral side of the signal recording area is not recorded, A cartridge main body in which the disc-shaped recording medium is rotatably accommodated, and surfaces of the cartridge main body that are opposed to each other are formed in portions corresponding to the inner peripheral side non-signal recording area and the outer peripheral side non-signal recording area And a disk support pedestal having a support base made of an elastic material attached to the support base. The disc support pedestal is formed so that the inner peripheral side is higher than the outer peripheral side.

In the disc cartridge constructed as described above, since the disc support pedestal is formed higher on the inner peripheral side than on the outer peripheral side, the disc substrate on the inner peripheral side can always support the disc substrate. Further, since the disk support base supports the disk substrate by the support member made of an elastic material, it supports the disk substrate without damaging it.

[0015]

DETAILED DESCRIPTION OF THE INVENTION A disk cartridge 1 according to the present invention will be described in detail below with reference to the drawings.

The disk cartridge 1 has a diameter of 30c.
An additionally recordable optical disc of m is rotatably housed. Then, the disc cartridge 1 is automatically loaded into a recording and / or reproducing device from an accommodating portion in which a plurality of disc cartridges are accommodated by using an automatic loading device.

As shown in FIGS. 1 and 2, the disc cartridge 1 includes an optical disc 2 on which an information signal is recorded.
And a cartridge body 3 in which the optical disk 2 is rotatably accommodated.

The optical disc 2 is provided with a disc substrate formed by molding a synthetic resin material such as polycarbonate resin. And this disk substrate,
Concentric with the center hole 4 and the inner peripheral non-signal recording area 2A
A signal recording area 2C is formed in the outer peripheral area, and an outer peripheral non-signal recording area 2B in which no information signal is recorded is formed in the outer peripheral area. On such a disc substrate, aluminum (Al) is formed on the signal recording area 2C.
And the like, and is further coated with a synthetic resin material that protects the reflective layer.

The optical disc 2 thus constructed has
A hub 4A having a center hole 4B with which a center spindle on the recording and / or reproducing apparatus side is engaged is mounted in the central region so as to close the center hole 4. The hub 4A is configured by attaching a metal plate having magnetic attraction to a ring member formed of a synthetic resin material.

In the cartridge body 3, a rectangular plate-shaped upper half 5 and a lower half 6 made of synthetic resin are butted against each other and fixed to each other by a plurality of screws 8.
The whole is formed into a flat box shape.

The upper half 5 and the lower half 6 are formed with arcuate disk storage walls 30 on their inner surfaces facing each other so as to correspond to the outer peripheral portion of the optical disk 2. The disc storage wall 8 is abutted against each other to store the optical disc 2 in a state where the upper half 5 and the lower half 6 are combined.

The cartridge main body 3 is provided with a plurality of positioning holes 7 at its corners for positioning when loaded in the recording and / or reproducing apparatus. Further, the cartridge main body 3 is provided with a circular disk table entrance opening 10 into which a desk table of a recording and / or reproducing apparatus enters, in a substantially central portion thereof.

A disc on the side of the recording and / or reproducing device which drives the optical disc 2 housed in the disc housing part when the disc cartridge 1 is mounted in the recording and / or reproducing device in the disc table entrance opening 10. The table enters. This disc table entrance opening 10 is specifically the hub 4 provided by closing the center hole 4 of the optical disc 2 housed in the disc housing part.
Face A to the outside.

Further, the cartridge body 3 has a recording and / or reproducing opening for exposing at least a part of the signal recording area 2C of the optical disc 2 rotatably accommodated in the disc accommodating portion to the outside over the inner and outer peripheries. Departments 11 are opened opposite each other. The recording and / or reproducing opening 11 is
It is formed in a rectangular shape at the approximate center in the left-right direction from the position close to the disc table entry opening 10 to the front side of the upper half and the lower half.

The recording and / or reproducing opening 11 is
The shutter mechanism 12 closes the lid. The shutter mechanism 12 includes a shutter member 13 that closes the recording and / or reproducing opening 11, a guide member that is fixedly attached to the shutter member 13, and that is provided along the front surface of the cartridge body 3 side. A shutter guide member 15 engaged with the groove 14 is provided.

The shutter member 13 is formed by bending a metal plate such as a thin stainless plate into a U-shape, and has a length dimension sufficient to close the recording and / or reproducing opening 11. . The shutter guide member 15 is fixed to the shutter member 13 with screws 16 and is engaged with a guide groove 14 provided along the front end line of the cartridge body 3. Further, the shutter guide member 15 is rotatably attached to the arm 17
Is attached. The other end of the arm 17 is attached to a gear 18 rotatably arranged at a corner of the cartridge body 3. And this gear 18
Engages with an engaging portion 19 provided on the side surface adjacent to the side surface of the cartridge body 3 provided with the guide groove 14.

The shutter mechanism 12 configured as described above
When not in use, the shutter member 13 is biased by the spring 20 in the direction of the arrow a and locks the recording and / or reproducing opening 11 at the closed position.

When the disc cartridge 1 is loaded in the recording and / or reproducing apparatus, the shutter member 13 is moved in the direction of arrow b by the opening pin that opens the shutter guide member 15 on the recording and / or reproducing apparatus side. It Therefore, the shutter guide member 15 is moved in the direction of arrow b against the spring 20, and the engaging portion 19 slides in the direction of c via the arm 17 and the gear 18 to lock the shutter mechanism 12. Then, the recording and / or reproducing opening 11 is opened.

By the way, as shown in FIGS. 2 and 3, on the inner surfaces of the upper and lower halves 5 and 6 which face each other, a shock is given to the optical disk 2 at a position corresponding to the non-signal recording areas 2A and 2B of the optical disk 2. A band-plate-shaped disc support pedestal 21 (21A, 21B) having a cushioning effect for softening is provided. The disc support pedestal 21 includes a support base 22 (22A, 22A) formed integrally with the upper and lower halves 5, 6.
B) and a supporting member 23 (23A, 23B) made of an elastic material attached to the supporting base 22.

The support base 22A is located on the outer peripheral side of the disc table entrance opening 10 and on the inner surfaces of the upper and lower halves 5 and 6 at equal intervals at positions corresponding to the inner peripheral non-signal recording area 2A of the optical disc 2. It has a strip shape and is convexly formed. here,
Four pieces are provided for each of the upper and lower halves 5, 6.

Similarly, the support base 22B is located inside the disk housing wall 8 and is provided at equal positions on the inner surfaces of the upper and lower halves 5 and 6 at positions corresponding to the outer peripheral non-signal recording area 2B of the optical disk 2. It has a strip shape and is convexly formed. Here, four pieces are provided in each of the pair of upper and lower halves 5, 6.

A support member 23 is attached to these support bases 22. As shown in FIG. 4, the support member 23 is made of an elastic material, so that the first layer 24 on the disk side and the second layer 25 on the cartridge side made of a base material having a large bending elastic modulus are used.
It is composed of

The first layer 24 is formed in the shape of a strip plate similar to that of the support base 22 and is made of an elastic material such as silicon rubber. Therefore, the optical disk 2 absorbs vibrations by the first layer 24 serving as a cushioning material, and is not damaged by vibrations when the disk cartridge 1 is transported.

The second layer is formed in the shape of a strip plate like the first layer, and is made of a synthetic resin material such as polyethylene terephthalate (PET) film having a large flexural modulus. ing. This second layer 25
Is preferably stiff, and specifically has a flexural modulus (according to a D-790 test) of about 70,000 kg / cm.

The first layer 24 and the second layer 25 are adhered by the first adhesive layer 26, and the second layer 25 and the support base 22 are adhered by the second adhesive layer 27. To be done. For example, a silicone adhesive is used as the first adhesive layer 26, and an acrylic adhesive is used as the second adhesive layer. These are not particularly limited as long as they are commonly used pressure sensitive adhesives.

Further, the disk supporting surface 28 of the supporting member 23.
Is formed by a matte-finished rough surface in order to prevent the disk supporting surface 28 and the optical disk 2 from being attracted to each other.
The disc adsorption prevention process is not limited to the roughened surface that is satin finished, and may be, for example, a groove formed in a radial shape, a spiral shape, a parallel shape, a convex shape, or a small projection, which is a so-called sucker action. Any shape and structure may be used as long as it is possible to prevent the adsorption of the disk by the above.

In the support member 23 thus constructed, the first layer 24, which serves as a cushioning material for the optical disc 2, is bonded by the second adhesive layer 27 via the second layer having a large bending elastic modulus. Therefore, it can be reliably attached to the support base 22. That is, when the first layer 24 is directly attached to the support base 22, it is difficult to reliably bond the first layer 24 because the first layer 24 is made of an elastic material having a weak stiffness. However, since the support member 23 is attached via the stiff second layer 25, the support member 23 can be reliably attached to the support base 22. Also, this support member 2
Since 3 is formed in the shape of a strip plate, it can also be attached to a portion where the above-mentioned opening 10 for entering the disk table and the opening 11 for recording and / or reproducing are close to each other.

The support member 23 is the support base 22.
Since the is projected, the intention of sticking can be easily specified. The support base 22 may be formed on the same surface as the inner surfaces of the pair of upper and lower halves 5, 6.

By the way, the disk support base 21 is shown in FIG.
As shown in, the height of the inner disk support pedestal 21A is higher than that of the outer disk support pedestal 20B by a height dimension H.
Is only formed high. Therefore, when the cartridge body 3 is placed horizontally so that the lower half 6 is on the lower side, the four inner peripheral side supporting members 23A on the lower half 6 are the non-signal recording areas on the inner peripheral side of the optical disc 2. The lower surface of 2A is contacted and supported. A gap corresponding to the height dimension H is formed between the lower surface of the non-signal recording area 2B on the outer peripheral side of the optical disc 2 and the supporting member 23B of the lower half 6.

The disc support pedestal 21 may be formed so that the outer peripheral side is lower than the inner peripheral side, and the support base 22 and the support member 2 constituting the disc support pedestal 21.
The height dimension of 3 is not limited.

The support member 23 described above is, for example,
As shown in FIGS. 5 and 6, a PET film or the like to be the second layer 25 is adhered on the release paper 29 with the second adhesive layer 27, and the first layer is further formed on the second layer 25. It is manufactured by adhering silicone rubber to be 24 with the first adhesive layer 26. The supporting member 23 manufactured in this way is composed of the adhesive layers 26, 27.
When is solidified, the release paper 29 is not cut, and only the support member 23 is cut so as to remain in a predetermined strip shape to be manufactured in a seal shape.

Therefore, when the support member 23 thus produced on the release paper 29 is attached to the support base 22, the support member 23 is peeled off from the release paper 29 and the second adhesive layer is formed. It is attached to the support base 22 via 27. The support member 23 includes PE in addition to the first layer made of silicone rubber.
Since it has a strong second layer made of a T film, the attaching work is easy.

The disc cartridge 1 thus constructed supports the disc on the inner peripheral side of the upper half 5 or the lower half 6 when the disc cartridge 1 is not loaded in the recording and / or reproducing apparatus and is not used and is arranged in a horizontal state. It is always supported by the pedestal 21. Therefore, the optical disc 2 rotatably housed in the cartridge body 3 does not collide with and damage the upper half 5 and the lower half 6 due to vibration during transportation.

Further, since the optical disc 2 is large and has the center hole 4 in the central region, it has a characteristic that it is easily warped. However, in this disc cartridge 1, since the disc support pedestal 21A on the inner peripheral side is formed higher than the disc support pedestal 21B on the outer peripheral side,
The inner circumference side non-signal recording area 2A of the optical disc 2 is supported by the inner circumference side disc support pedestal 21A, and the outer circumference side non-recording area 2B of the optical disc 2 is the outer circumference side disc support pedestal 21B.
Will certainly be supported by.

Further, when the disc cartridge 1 is loaded in the recording and / or reproducing apparatus, it is mounted on the disc table and recording and / or recording is performed in the positioning hole 7 formed on the outer peripheral side of the cartridge body 3 of the disc table. Positioning is performed by engaging a positioning pin provided on the reproducing device side. Then, in the disc cartridge 1, the center spindle is engaged with the center hole 4B of the hub 4A, the optical disc 2 is magnetically chucked by the magnet, and the disc cartridge 1 can be rotated together with the disc table.

At this time, in the disc cartridge 1, the optical disc 2 is lifted by the disc table, and the disc support pedestal 21 is brought into non-contact state. Therefore, the disc support base 21 does not hinder the rotation of the optical disc 2.

As described above, in the disc cartridge according to the present invention, the disposition of the disc support pedestal 21 described above is not limited to this embodiment, but can be changed appropriately.

[0048]

As described above, in the disc cartridge according to the present invention, since the disc support pedestal is formed so that the inner peripheral side is higher than the outer peripheral side, the optical disc can be always supported by the inner peripheral side. Further, since the disc support pedestal supports the optical disc by the support member made of an elastic material, it does not damage the optical disc.

Further, in this disc cartridge, since the supporting member is composed of the first layer made of an elastic body and the second layer having a large flexural modulus, it has a strong elasticity and is excellent in sticking work. . Further, since the supporting member is easy to process and attach and facilitates the attaching work, the production efficiency of the disc cartridge can be improved and the cost can be largely reduced.

[Brief description of drawings]

FIG. 1 is a perspective view of a disc cartridge according to the present invention.

FIG. 2 is an exploded perspective view of the disc cartridge.

FIG. 3 is a vertical cross-sectional view of a main part of the disc cartridge.

FIG. 4 is a cross-sectional view of a support member attached to a disc support base of the disc cartridge.

FIG. 5 is a cross-sectional view of a main part of a support member on a release paper.

FIG. 6 is a plan view of the support member cut into a strip shape in the process of manufacturing the support member.

FIG. 7 is an exploded perspective view of a conventional disc cartridge.

FIG. 8 is a perspective view of a disc supporting member of the disc cartridge.

FIG. 9 is a perspective view of a disc support member of the disc cartridge.

[Explanation of reference numerals] 1 disc cartridge, 2 optical disc, 3 cartridge, 4 center hole, 5 upper half, 6 lower half, 8 disc storage wall, 9 disc table entry opening, 10 recording and / or reproducing opening, 21 disk support base, 22 support base, 23 support member, 2
4 first layer (of support member), second 25 (of support member)
Layer, 26 first adhesive layer, 27 second adhesive layer, 28
Disc support surface, 29 release paper

Claims (5)

[Claims] 1. A signal recording area in which an information signal is recorded,
An inner peripheral non-signal recording area which is formed on the inner peripheral side of this signal recording area and has a center hole formed therein, and an information signal which is formed on the outer peripheral side of this signal recording area are not recorded. A disc-shaped recording medium having an outer peripheral non-signal recording area, a cartridge main body in which the disc-shaped recording medium is rotatably accommodated, and surfaces of the cartridge facing each other, A disc support pedestal including a support base formed at a position corresponding to the outer peripheral non-signal recording area, and a support member made of an elastic material attached to the support base. A disk cartridge characterized in that the inner peripheral side is formed higher than the outer peripheral side. 2. The disc cartridge according to claim 1, wherein the disc support pedestal has a support base provided on an inner peripheral side higher than a support base provided on an outer peripheral side. 3. The disc cartridge according to claim 1, wherein a support member provided on an inner peripheral side of the disc support pedestal is made higher than a support member provided on an outer peripheral side thereof. 4. The support member is composed of a first layer on the disk-shaped recording medium side made of an elastic body and a second layer on the cartridge body side made of a base material having a large flexural modulus. The disk cartridge according to claim 1, wherein: 5. The disk cartridge according to claim 1, wherein the support member is formed in a strip plate shape.