JPH0261871A - Optical information recording disk and its manufacture - Google Patents

Abstract

PURPOSE:To easily perform the inserting operation of the central shaft of a stamper, to improve durability, and to attain miniaturization by comprising a hub of an inner hub having a through hole with large in diameter made of metallic plate and an outer hub having a spindle hole small in diameter. CONSTITUTION:The inner hub 3 is adhered on one plane of a disk substrate 1 by inserting the center hole 9 of the disk substrate 1 to a first insertion part 22 provided protrusively at a jig 21, inserting the through hole 12 of the inner hub 3 to a second insertion part 23 at a jig 23, then, aligning the substrate 1 with the center of the inner hub 3. Next, photo setting resin 26 is spread by the substrate 1 and the stamper 24 by inserting the through hole 12 of the inner hub 3 to the central shaft 25 of the stamper 24, and a resin layer 10 on which an inverted pattern formed in the stamper 24 is transferred is formed on the substrate 1 after setting. Next, a thin film layer 11 including a recording layer is formed on the layer 10. Following that, the center of a signal pattern 2 is divided with a microscope 27, and the outer hub 4 is mounted on the inner hub 3 by aligning the center of the spindle hole 16 with that of the pattern 2, then, recording veneers 5 and 6 can be obtained.

Description

[Detailed description of the invention] The present invention relates to an optical information recording disk and a manufacturing method thereof.

[Conventional technology]

Conventionally, as shown in Fig. 9, a signal pattern 3 is printed on one side.
1 and a thin film layer 32 such as a recording layer, a highly rigid hub 35 having a spindle hole 34 is located at the center of the substrate 33 on which a thin film layer 32 such as a recording layer and the like are formed.
An optical information recording disk is known (Japanese Unexamined Patent Publication No. 61-214155). In this optical information recording disk, the center of the signal pattern 31 is determined by inserting a rotating spindle provided in a disk drive device into the spindle hole 34, and information can be recorded/reproduced.

As a manufacturing method for this type of optical information recording disk, first, a hub 35 is attached to the center of the substrate 33 on which the signal pattern is formed, and then a stamper is inserted into the spindle hole 34 made in the hub 35. A method is known in which a central shaft erected at the center is inserted and the resin is spread between the substrate 33 and a stamper to form a resin layer on the substrate 33 on which the desired signal pattern 31 is transferred ( Tokukai Showa 6
2-1144).

Thus, in the optical information recording disk manufactured by the above method, the spindle hole 34 is used for positioning the substrate 33 during signal pattern transfer and for positioning the signal pattern 31 during recording/reproduction.
It is used for centering. Therefore, when the inner diameter of the spindle hole 34 and the outer diameter of the rotary spindle or the central shaft clear, when the rotary spindle or the central shaft of the stamper is inserted into the spindle hole 34 with such a small clearance, the large diameter Fitting a large-diameter rotating spindle or center shaft into the spindle hole 34 is easier than fitting a small-diameter rotating spindle or center shaft into a small-diameter spindle hole 34 because the contact area between both members is larger. The insertion operation can be made smooth. Therefore, it is advantageous in terms of productivity and durability to fit a large-diameter rotary spindle or central shaft into the large-diameter spindle hole 34.

However, on the other hand, when equipped with a large diameter rotating spindle,
■ Disk drive devices become larger and heavier; ■ The time required to start and stop the device becomes longer, resulting in slower data transfer speeds; ■ Vibration and noise increase. (2) Various inconveniences occur, such as increased power consumption.

The present invention has been made to simultaneously solve the two contradictory technical problems mentioned above.

It is an object of the present invention to provide an optical information recording disk that is easy to fit into a spindle hole and the central axis of a rotary spindle or a stamper, has excellent durability, and allows a drive device to be downsized and highly functional.

The hub attached to the center is composed of an inner hub made of a metal plate with a large diameter through hole and an outer hub made of a metal plate with a small diameter spindle hole, and the outer hub is connected to the inner hub. It is characterized by being fixed to the outer surface of the hub.

In addition, an inner hub is attached to the center of the substrate before the signal pattern is transferred, and then the signal pattern is transferred centering around the large diameter through hole opened in the inner hub, and the desired recording film etc. A manufacturing feature is that after forming a thin film layer, an outer hub is fixed to the outer surface of the inner hub.

[Effect]

With the above configuration, the center shaft of the large diameter stamper can be inserted into the large diameter through hole in the step of transferring the signal pattern to the substrate.

The insertion and insertion of both members becomes smoother, and workability and mass productivity can be improved. In addition, there is little wear and damage to the through hole and the center shaft, improving the durability of the center shaft, preventing dust from being generated from the hub and the center shaft, and preventing damage to the recording layer and the like.

In addition, in the process of rotationally driving an optical information recording disk, it is possible to apply a small-diameter rotating spindle by fixing an outer hub with a small-diameter spindle hole on the outer surface of the inner hub after transferring the signal pattern. This makes it possible to reduce the size of the disk drive device, increase the data transfer speed, reduce vibration and noise, and reduce power consumption.

Furthermore, since the inner and outer hubs are each made of a metal plate, the two parts can be firmly joined together by means such as welding, allowing highly reliable optical information recording without the hub falling off. Discs can be provided.

〔Example〕

First, one embodiment of the present invention will be described based on FIGS. 1 to 4.

FIG. 1 is a cross-sectional view showing the overall structure of the optical information recording disk according to this embodiment, and FIG. 2 is a cross-sectional view showing the main part of the hub setting section in detail. As shown in these figures, the optical information recording disk according to this embodiment has an inner hub 3 attached to the center of the signal pattern 2 forming surface of the substrate 1, and an outer hub 4 attached to the outer surface of the inner hub 3. The two recording single plates 5 and 6 are bonded together with the signal pattern 2 on the inside and an inner circumferential spacer 7 and an outer circumferential spacer 8 interposed therebetween.

The substrate 1 is formed into a disk shape with a center hole 9 in the center using a flat transparent material having a high degree of optical homogeneity and smoothness, and has a concentric or spiral shape on one side. A signal pattern 2 is formed concentrically with the center hole 9. The signal pattern 2 can be transferred onto the resin layer 10 provided on one side of the substrate 1, as shown in FIGS. 1 and 2, or can be cut directly onto the substrate 1. A desired thin film layer 11 such as a recording layer is formed on the surface of the substrate 1 on which the signal pattern 2 is formed.

As shown in FIG. 3, the inner hub 3 is formed into a ring shape with a larger diameter than the center hole 9, and an upright piece 13 is folded up at right angles around a through hole 12 formed in the center. It is being The diameter of the through hole 12 is set to a diameter that allows a central shaft, which is erected at the center of a stamper for transferring the signal pattern 2 to the substrate 1, to be inserted therein rather closely.

This inner hub 3 is formed by bending a metal plate. As the metal material constituting the inner hub 3, any material having appropriate rigidity can be used, regardless of whether it is magnetic or not.

The inner hub 3 is bonded to the substrate surface of the substrate 1 on the side where the signal pattern 2 is formed, with the upright piece 13 facing outward to align the center of the through hole 12 with the center of the center hole 9.

As shown in FIG. 4, the outer hub 4 is formed into a ring shape with a smaller diameter than the center hole 9, and has a fixing portion 1 on the outer periphery.
4, a guide piece 15 is also formed in a curved manner on the inner peripheral portion. Spindle hole 1 formed in the inner circumference of the guide piece 15
The hole 6 is formed to have a smaller diameter than the through hole 12 formed in the inner hub 3, and has a diameter that allows a rotating spindle provided in the disk drive device to be inserted therein rather tightly. The outer hub 4 can be formed using the same metal plate as the inner hub, but since the rotating spindle provided in the disk drive device is repeatedly inserted into the outer hub 4, it has better wear resistance. It is preferable to use a metallic material. In addition, magnetic metal plates are used for optical information recording disks applied to disk drives that have magnetic clamping type clamping mechanisms, and optical information recording disks that are used for disk drive units that have mechanical clamping type clamping mechanisms. A non-magnetic metal plate is used for the disk.

This outer hub 4 has the guide piece 15 directed inward.

It is attached by aligning the center of the spindle hole 16 with the center of the through hole 12 formed in the inner hub 3 and fixing the fixing part 14 to the inner hub 3. The inner hub 3 and the outer hub 4 can be fixed by, for example, welding, adhesive, or screwing, but spot welding is preferred because of its good productivity and high joint strength. Particularly suitable.

Hereinafter, a method for manufacturing an optical information recording disk according to the present invention will be explained based on FIGS. 5 to 7.

First, as shown in FIG.
While inserting the center hole 9 into the insertion part 22 of the
The through hole 12 is slightly tightly fitted into the second fitting part 23 formed concentrically with the first fitting part 22 to connect the substrate 1 and the inner hub 3.
The inner hub 3 is bonded to one side of the substrate 1 by aligning the centers thereof with the inner hub 3.

Next, as shown in FIG. 6, the through hole 12 of the inner hub 3 bonded to the center of the substrate 1 is fitted into the central shaft 25 erected at the center of the stamper 24, and the substrate The center of the stamper 24 is aligned with the center of the stamper 24.

In this state, the photocurable resin 2 is attached to the substrate l and the stamper 24.
After the resin is cured, a resin layer 10 to which the inverted pattern formed on the stand bar 24 is transferred is formed on the substrate 1.

Next, a desired thin film layer 11 including at least a recording layer is formed on this resin layer.

Furthermore, as shown in FIG. 7, the signal pattern 2 transferred to the substrate l is observed with an optical microscope 27 to determine the center of the signal pattern 2, and the spindle hole 16 formed in the outer hub 4 is located at the center of the signal pattern 2. The outer hub 4 is attached to the inner hub 3 by aligning their centers to obtain recording single plates 5 and 6.

Finally, with the thin film layer inside, these recording single plates 5,
6 are bonded together via an inner circumferential spacer 7 and an outer circumferential spacer 8 to obtain a desired double-sided recording type optical information recording disk.

In driving this optical information recording disk, as shown in FIG.
Then, a rotary spindle 28 provided in the recording/reproducing apparatus is fitted slightly tightly, and the outer surface of the substrate l is placed on the turntable 29. As a result, the rotation center of the board 1, that is, the center of the signal pattern 2, is determined, and the turntable 2
The rotational force of 9 is transmitted to the substrate 1.

In the optical information recording disk of the above embodiment, the hub is formed of an inner hub 3 having a large diameter through hole 12 and an outer hub 4 having a small diameter spindle hole 16.

In the step of transferring the signal pattern onto the substrate, the center shaft 25 of a large diameter stamper can be inserted into the large diameter through hole 12. Therefore, the centering operation of the substrate 1 is facilitated, workability and mass productivity are improved, and wear and damage to the through hole 12 and the central shaft 25 are prevented, thereby preventing damage to the recording layer etc. due to dust generation. be done.

In addition, in the process of rotationally driving the optical information recording disk, after the signal pattern 2 is transferred, the outer hub 4 having the small diameter spindle hole 16 is fixed to the outer surface of the inner hub 3. This makes it possible to reduce the size of the disk drive, increase the data transfer rate, reduce vibration and noise, and reduce power consumption.

Furthermore, since the inner hub 3 is bonded to the inner surface of the recording single plates 5 and 6, even if the inner hub 3 should be separated from the substrate 1 during rotation, the substrate l will not fall off the rotating spindle 28 and the substrate 1 damage is prevented. Further, since both the inner hub 3 and the outer hub 4 are formed of metal plates and joined by welding, there is almost no possibility that the outer hub 4 will fall off from the inner hub 3.

Therefore, a highly reliable optical information recording disk can be provided.

The gist of the present invention is that the hub is composed of an inner hub having a large-diameter through hole and an outer hub having a small-diameter spindle hole, and the shapes of the inner hub and the outer hub are the same as those described above. It is not limited to the examples. This can be appropriately designed as necessary.

Further, in the above embodiments, a single-sided recording type optical information recording disk was explained as an example, but a single-sided recording type optical information recording disk can also be obtained by using the single recording plate alone.

〔Effect of the invention〕

As explained above, the optical information recording disk of the present invention has
The hub consists of an inner hub with a large-diameter through-hole and an outer hub with a small-diameter spindle hole, so by using each hub appropriately, workability and mass production can be improved, and the durability of the through-hole and center shaft can be improved. It is possible to improve this, prevent damage to the recording layer etc. due to dust generation, miniaturize the disk drive device, increase data transfer speed, reduce vibration and noise, reduce power consumption, etc. Furthermore, since the inner hub and the outer hub are each made of a metal plate, both members can be firmly joined, and a highly reliable optical information recording disk without the hub falling off can be provided.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing the overall structure of the optical information recording disk according to the present invention, FIG. 2 is a cross-sectional view of main parts showing details of the hub setting section, FIG. The figure is a perspective sectional view of the outer hub, FIGS. 5 to 7 are process explanatory diagrams showing a method of manufacturing an optical information recording disk, FIG. 8 is a sectional view of main parts showing the driving state of the optical information recording disk, and FIG. The figure is a sectional view of a conventional optical information recording disk. l2 substrates, 2: Signal pattern, 3: Inner hub, 4: Outer hub, 5, 6: Recording single plate, 7: Inner spacer, 8: Outer spacer, 9: Center hole, 12: Through hole, 16: Spindle hole, 21: jig, 24 nistamper, 25: central axis, 28 two-rotation spindle, 29: turntable. Figure 3 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9

Claims (5)

[Claims] (1) In an optical information recording disk equipped with a highly rigid hub with a through hole in the center of the substrate, the hub is divided into an inner hub made of a metal plate with a large diameter through hole and a small diameter hub. 1. An optical information recording disk comprising: an outer hub made of a metal plate having a spindle hole; and the outer hub is fixed to the outer surface of the inner hub. (2) The optical information recording disk according to claim 1, wherein the outer hub is made of a metal material having higher wear resistance than the inner hub. (3) The optical information recording disk according to claim 1, wherein the outer hub is spot welded to the inner hub. (4) The optical information recording disk according to claim 1, wherein the outer hub is made of a magnetic metal material. (5) In a method for manufacturing an optical information recording disk including a step of attaching a hub to the center of a substrate, an inner hub is attached to the center of the substrate before the signal pattern is transferred, and then the inner hub is attached to the inner hub. An optical device characterized in that, after a signal pattern is transferred mainly through the opened large-diameter through hole and a desired thin film layer such as a recording film is formed, an outer hub is fixed to the outer surface of the inner hub. A method for manufacturing an information recording disc.