JP2006018925A - Substrate drying equipment and manufacturing method of optical disk - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress occurrence of distortion of a substrate in a coloring matter drying process. <P>SOLUTION: Substrate drying equipment is provided with a drying furnace 2, a substrate transporting apparatus 1 provided in the drying furnace 2, and a control apparatus for controlling the drying furnace 2 and the substrate transporting apparatus 1. The substrate transporting apparatus 1 is provided with a transporting means 11 holding an inner peripheral part of a substrate in which coloring matter is applied to one main surface and transporting the substrate, and a drive means 21 for driving the transporting means 11. After organic coloring matter is applied to the one main surface of the substrate, the substrate is transported in the drying furnace 2. The substrate is transported holding the inner peripheral part of the substrate by the holding means 12, organic solvent included in the organic coloring matter is volatilized. Thereby, the organic coloring matter applied to the one main surface of the substrate can be dried. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a substrate drying apparatus and an optical disk manufacturing method for manufacturing a write-once optical disk.

  In recent years, write-once optical discs have become widespread. A write-once optical disc is an optical disc that cannot be erased or rewritten, but can additionally record information at different locations. As such a recordable optical disc, a CD-R (Compact Disc Recordable), a DVD-R (Digital Versatile Disc-Recordable) and the like are widely known.

  Conventionally, in a write-once optical disc manufacturing process, a dye diluted with an organic solvent is applied to a substrate, and then the substrate is heated in a substrate drying apparatus. Generally, the temperature in the substrate drying apparatus is set to about 70 ° C., and the heating time is set to about 10 minutes. By heating the substrate in this manner, the organic solvent used for diluting the dye can be sufficiently volatilized to maintain the signal quality.

  As a substrate transport device for transporting a substrate in a substrate drying device, a device configured to be able to hold the outer periphery of an optical disc has been proposed (see, for example, Patent Document 1).

  FIG. 8A is a top view schematically showing a configuration of a substrate transfer apparatus provided in the substrate drying apparatus. FIG. 8B is a side view schematically showing the configuration of the substrate transfer apparatus provided in the substrate drying apparatus. FIG. 9A is a top view for explaining the operation of the substrate transfer apparatus provided in the substrate drying apparatus. FIG. 9B is a side view for explaining the operation of the substrate transfer apparatus provided in the substrate drying apparatus.

  As shown in FIGS. 8A and 8B, the substrate transfer apparatus includes transfer units 102a and 102b that hold both sides of the substrate and a transfer unit 102c that holds the lower side of the substrate. The transport units 102 a, 102 b, and 102 c include a holding unit 103 and a driving unit 104 for driving the holding unit 103. The holding means 103 is a belt having a comb-shaped guide formed by repeatedly forming V-shaped grooves on the surface. The driving means 104 is provided at both ends of the holding means 103, and the holding means 103 is driven by its rotation.

  In the substrate transport apparatus having the above-described configuration, as shown in FIGS. 9A and 9B, the substrate 101 on which the pigment is applied on one main surface is transported while holding the outer peripheral portion from three directions by a comb-shaped guide.

JP-A-6-265265

  However, if the outer peripheral portion is held at a high temperature, the creeping phenomenon occurs due to the stress applied to the outer peripheral portion, and the outer peripheral portion of the substrate is distorted, which deteriorates the mechanical characteristics of the optical disc. Such deterioration of the mechanical characteristics particularly leads to deterioration of focus acceleration and tracking acceleration during high-speed rotation.

  It is not preferable that the distortion that causes the deterioration of the focus acceleration and the tracking acceleration is present particularly in the outer peripheral portion. This is because when the optical disk is rotated at a constant rotation speed, the linear velocity increases toward the outer peripheral side. For example, when the optical disk is rotated at 10,000 rpm, which is said to be the limit of the spindle motor, the linear velocity is 25 m / s (about 7 times speed) at the innermost circumference r = 24 mm, and 60 m / second at the outermost circumference r = 58 mm. s (about 17 times speed).

  Accordingly, an object of the present invention is to provide a substrate drying apparatus and an optical disk manufacturing method capable of suppressing distortion generated at the outer periphery of the substrate when the dye is dried.

In order to solve the above problems, a first invention is a substrate drying apparatus including a substrate transport device that transports a substrate coated with a dye on one main surface.
The substrate transfer device
A transport means for transporting the substrate while holding the inner periphery of the substrate coated with the dye on one main surface;
A substrate drying apparatus comprising: driving means for driving the conveying means.

  In the first aspect of the invention, the inner peripheral portion of the substrate coated with the pigment on one main surface is held by the conveying means, and the conveying means is driven by the driving means to convey the substrate, so that stress is not applied to the outer peripheral portion. The substrate can be transported.

  In the first invention, the transport means preferably transports the substrate while holding the center hole of the substrate. In the first invention, it is preferable that the transport means transports the substrate while adsorbing the inner periphery of the substrate.

According to a second aspect of the present invention, there is provided a method for manufacturing an optical disc having a recording layer made of a dye
A coating process for coating a pigment on one principal surface of the substrate;
And a drying step of volatilizing a solvent contained in the dye while holding the inner peripheral portion of the substrate coated with the dye.

  In the second invention, since the substrate coated with the dye on one main surface is dried while holding the inner peripheral portion, the dye applied on one main surface of the substrate without applying stress to the outer peripheral portion. Can be dried.

  In 2nd invention, it is preferable to hold | maintain the center hole of a board | substrate at a drying process. In the second invention, it is preferable that the inner peripheral portion of the substrate is adsorbed in the drying step.

  As described above, according to the present invention, the dye applied to one main surface of the substrate can be dried without applying stress to the outer peripheral portion. Thereby, generation | occurrence | production of the distortion in the outer peripheral part of a board | substrate can be suppressed. That is, an optical disc having excellent mechanical characteristics can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In all the drawings of the following embodiments, the same or corresponding parts are denoted by the same reference numerals.

(1) Configuration of Substrate Drying Device FIG. 1 is a top view showing a configuration example of a substrate drying device according to an embodiment of the present invention. As shown in FIG. 1, the substrate drying apparatus includes a drying furnace 2, a substrate transport apparatus 1 provided in the drying furnace 2, and a control device (FIG. 1) for controlling the drying furnace 2 and the substrate transport apparatus 1. Not shown). This substrate drying apparatus is suitable for use in a substrate drying process of a write-once optical disc.

  The drying furnace 2 includes a heating means for heating the inside thereof, a door 2 a for carrying the substrate into the drying furnace 2, and a door 2 b for carrying the substrate out of the drying furnace 2. As heating means, means well known to those skilled in the art can be used. An example of such means is an infrared heater. Although not shown in the drawing, a carry-in device for carrying the substrate into the drying furnace 2 is provided above the substrate drying device, and a carry-out device for carrying the substrate out of the drying furnace 2 is provided below the substrate drying device. It has been.

  As shown in FIG. 1, the substrate transport apparatus 1 includes a plurality of transport means 11 that transports a substrate while holding the inner periphery of the substrate, and a drive means 21 that drives the transport means 11. The conveying means 11 includes a rod-shaped arm 12 and a holding means 13 provided at one end of the arm 12 in the longitudinal direction. The drive means 21 is supported at both ends by a drive shaft 22 provided slightly above the center of the drying furnace 2, a drive shaft 22 provided slightly below the center of the drying furnace 2, and the drive shafts 22, 22. Belt 23. The other end of the arm 12 is connected to the outer surface of the belt 23.

  The holding means 13 is configured to be able to hold the inner peripheral portion of the substrate. The holding unit 13 is, for example, a holding unit that holds the center hole of the substrate or a holding unit that sucks the inner peripheral portion of the substrate.

  Since the inner peripheral portion has a lower linear velocity than the outer peripheral portion, even if distortion occurs in the inner peripheral portion, it does not cause great deterioration in the recording / reproducing characteristics, but the occurrence of distortion in the signal region is further reduced, In consideration of obtaining better recording / reproducing characteristics, it is preferable to keep the area inside the recording area. Further, in consideration of further reducing the occurrence of distortion in the recording area and reducing the occurrence of distortion in the clamp area to obtain better recording / reproduction characteristics, the area inside the clamp area can be retained. preferable.

  The holding means 13 for holding the center hole of the substrate includes a holding portion and position defining portions provided on both sides of the holding portion. For example, a receiving piece (hereinafter referred to as an inner peripheral receiving piece) having an engineering letter shape. Called).

  The holding part holds the substrate by the center hole and has a shape at least smaller than the center hole. As the shape, for example, a cylindrical shape having a smaller diameter than the center hole can be mentioned.

  The position defining portion is for defining the position of the substrate held by the holding portion, and has a shape that protrudes at least upward at both ends of the holding portion and can define the position of the substrate held by the holding portion. The shape is not particularly limited, and examples thereof include a disk shape. By providing the position defining portion having such a shape, it is possible to prevent the substrate from dropping when the substrate is carried in and carried, and stable carrying in and carrying of the substrate can be realized.

  FIG. 2 is a side view and a front view showing an example of the inner periphery receiving piece. The inner circumferential receiving piece includes a holding portion 31 having a columnar shape and a position defining portion 32 having a truncated cone shape, and the truncated surfaces (upper surfaces) of the two truncated cones are smooth with respect to both bottom surfaces of the cylinder. It has the shape joined to. The width of the inner periphery receiving piece is, for example, 1.6 mm, and the width of the holding portion 31 is, for example, 0.7 mm. Further, the diameter (diameter) φ of the holding portion 31 having a columnar shape is, for example, 5 mm, and the diameter (diameter) φ of the bottom surface of the position defining portion 32 having a truncated cone shape is, for example, 8 mm.

  FIG. 3 is a front view and a side view showing an example of the holding means 13 that sucks the inner periphery of the substrate. As shown in FIG. 3, the holding means 13 includes a disk-shaped support body 41 and a ring-shaped vacuum pad 42 provided on the support body 41. A plurality of suction holes 43 are provided on the side of the vacuum pad 42 that adsorbs the substrate, and the inside of the suction pad 43 is configured to be evacuated under reduced pressure. The plurality of suction holes 43 are arranged on the vacuum pad 42 so that, for example, adjacent suction holes 43 are equally spaced. The diameter (diameter) of the vacuum pad 42 is preferably selected smaller than the inner diameter (diameter) of the signal area of the substrate, more preferably smaller than the inner diameter (diameter) of the clamping area of the substrate, for example, 22 mm. . Moreover, the diameter (diameter) of the support body 41 is selected according to the size of the vacuum pad 42, for example, 30 mm.

(2) Optical Disk Manufacturing Method Next, an optical disk manufacturing method according to an embodiment of the present invention will be described with reference to FIGS. FIG. 4 is a flowchart for explaining an optical disk manufacturing method according to this embodiment. 5 and 6 are cross-sectional views for explaining a method of manufacturing an optical disc according to this embodiment. FIG. 7 is a top view for explaining the operation of the substrate transfer apparatus according to this embodiment.

(Substrate molding process)
First, as shown in FIG. 5 (a), the first substrate 51 in which irregularities are formed on one main surface is formed by, for example, injection molding. As a material constituting the first substrate, for example, a low water-absorbing resin such as polycarbonate (PC) or a cycloolefin polymer (for example, ZEONEX (registered trademark)) can be used.

(Dye application process)
Next, as shown in FIG. 5B, an organic dye diluted with an organic solvent is formed on one main surface (surface on which irregularities are formed) on the first substrate 51 by, for example, spin coating. The recording layer 52 is formed by applying uniformly. As the organic dye, for example, a cyanine dye or a phthalocyanine dye can be used. As the organic solvent, for example, a perfluoroalkyl alcohol solvent such as octafluoropentanol, a ketone alcohol solvent such as diacetone alcohol, and hydroxymethylbutanone can be used.

(Drying process)
Next, the 1st board | substrate 51 with which the organic pigment | dye was apply | coated to one main surface is sequentially carried in into the drying furnace 2 through the door 2a, and the inner peripheral part of a board | substrate is hold | maintained by the holding means 13. FIG. Then, the organic solvent contained in the organic dye is volatilized while transporting the first substrate 51 in the direction of the arrow a. When the first substrate 51 reaches the unloading position, the first substrate 51 is unloaded from the drying furnace 2 through the door 2b. The transport means 11 from which the substrate 51 has been removed moves in the direction of the arrow b and returns to the carry-in position again.

  The temperature in the drying furnace 2 and the holding time (transport time) are preferably selected in consideration of the coating thickness of the organic dye, the type and amount of the organic solvent used for diluting the organic dye, and the like. The temperature in the drying furnace 2 is selected in the range of 70 to 90 ° C., for example, and the holding time is selected in the range of 10 to 30 minutes, for example.

(Reflective layer deposition process)
Next, as shown in FIG. 5C, a reflective layer 53 is formed on the recording layer 52 by, eg, sputtering. As a material of the reflective layer 53, for example, a metal element, a metalloid element, a compound or a mixture thereof is used, and more specifically, for example, Al, Ag, Au, Ni, Cr, Ti, Pd, Co, A simple substance such as Si, Ta, W, Mo, Ge, or an alloy containing these simple substances as a main component can be used. In consideration of practicality, it is preferable to use an Al-based material, an Ag-based material, an Au-based material, a Si-based material, or a Ge-based material among them.

(Protective layer forming step)
Next, as shown in FIG. 6D, an ultraviolet curable resin is uniformly applied on the reflective layer 53 by, for example, spin coating. Then, the protective layer 54 is formed by irradiating and curing the applied ultraviolet curable resin with ultraviolet rays.

(Lamination process)
Next, as shown in FIG. 6E, an ultraviolet curable resin is uniformly applied on the protective layer 54 or the second substrate 56 by, for example, a spin coating method, and the applied ultraviolet curable resin is passed through the applied ultraviolet curable resin. The first substrate 51 and the second substrate 56 are bonded together. And after adjusting the thickness of ultraviolet curable resin, it irradiates with an ultraviolet-ray. Thereby, the ultraviolet curable resin is cured and the adhesive layer 55 is formed.

(Label printing process)
Next, as shown in FIG. 6 (f), a label layer 57 made up of characters, pictures and the like is printed on the second substrate 56 side. As a material of the label layer 57, for example, an ultraviolet curable ink can be used. The target optical disc is manufactured through the above steps.

According to one embodiment of the present invention, the following effects can be obtained.
After applying the organic dye on one main surface of the first substrate 51, the organic solvent contained in the organic dye is volatilized by transporting the inside of the drying furnace 2 while holding the inner periphery of the first substrate 51. Therefore, the organic dye applied to one main surface of the first substrate 51 can be dried without applying stress to the outer peripheral portion. Therefore, generation | occurrence | production of the distortion in the outer peripheral part of an optical disk can be suppressed. That is, an optical disc having excellent mechanical characteristics can be provided. Therefore, for example, even in high-speed recording of 8 times or more, since the focus acceleration can be kept low, stable recording / reproducing characteristics can be realized.

  EXAMPLES Hereinafter, although an Example demonstrates this invention concretely, this invention is not limited only to these Examples. In this embodiment, a case where the present invention is applied to a DVD-R will be described.

Example First, a first substrate 51 made of polycarbonate was formed by injection molding. Next, an organic dye diluted with an organic solvent was uniformly applied on the first substrate by spin coating.

  Next, the first substrate 51 was sequentially carried into the drying furnace 2 of the substrate drying apparatus, and the center hole was held by the inner peripheral receiving piece 13. The first substrate 51 was transported in the direction of arrow a while the center hole was held by the inner circumferential receiving piece 13 to volatilize the organic solvent. In addition, the temperature in the drying furnace 2 was set to 85 degreeC, and the time which conveys the inside of the drying furnace 2 was set to 10 minutes.

  Next, the first substrate 51 was unloaded from the drying furnace 2, and a reflective layer 53 was formed on the recording layer 52 by sputtering. Next, an ultraviolet curable resin was uniformly applied on the reflective layer 53 by a spin coating method, and then the ultraviolet curable resin was cured by irradiating ultraviolet rays, whereby a protective layer 54 was obtained.

  Next, an ultraviolet curable resin was uniformly applied on the protective layer 54, and the first substrate 51 and the second substrate 56 were bonded together via the ultraviolet curable resin. Thereafter, the adhesive layer 55 was obtained by irradiating ultraviolet rays to cure the ultraviolet curable resin. Next, a label layer 57 was formed on the second substrate 56. In addition, the thickness of each above-mentioned board | substrate and each layer, material, etc. shall be based on DVD-R specification.

And when the focus acceleration of the optical disk obtained as described above was measured under the following measurement conditions, the focus acceleration was 12.8 m / s ² Measurement conditions Measurement radius position: 58 mm
Rotation speed: 2000rpm

Comparative Example Next, an optical disk was manufactured in the same manner as in the example except that the substrate was transferred using a conventional substrate transfer device. When the focus acceleration was measured in the same manner as in the example, the focus acceleration was 19.5 m / s ² . Here, the conventional substrate transfer apparatus refers to an apparatus that transfers the inside of the drying furnace while holding the substrate by the outer peripheral portion (see FIG. 8).

  From the above examination results, the following can be understood. That is, it can be seen that the focus speed of the optical disc of the example is lower than that of the optical disc of the conventional example. That is, it can be seen that by holding the inner peripheral portion of the substrate in the drying process, it is possible to manufacture an optical disc having good mechanical properties while suppressing the occurrence of distortion in the outer peripheral portion.

  The embodiment of the present invention has been specifically described above, but the present invention is not limited to the above-described embodiment, and various modifications based on the technical idea of the present invention are possible.

  For example, the numerical values given in the above-described embodiment are merely examples, and different numerical values may be used as necessary.

  In the above-described embodiment, an example in which the present invention is applied to a method for manufacturing an optical recording medium (for example, a DVD (Digital Versatile Disc)) configured by bonding two substrates is shown. The invention is not limited to this manufacturing method. For example, the present invention is applied to an optical recording medium (for example, CD-R (Recordable)) in which a recording layer and a protective layer are sequentially formed on a substrate, and information signals are recorded or reproduced by irradiating light from the substrate side. Can be applied. Further, an optical recording medium (for example, Blu-ray Disc (registered trademark)) on which a recording layer and a light transmission layer are sequentially laminated on a substrate, and information signals are recorded or reproduced by irradiating light from the light transmission layer side. The present invention can also be applied to manufacturing methods such as

It is a top view which shows the example of 1 structure of the board | substrate drying apparatus by one Embodiment of this invention. It is the side view and front view which show the example of 1 shape of an inner periphery receiving piece. It is the front view and side view which show an example of the holding means which adsorb | sucks the inner peripheral part of a board | substrate. 5 is a flowchart for explaining a method of manufacturing an optical disc according to an embodiment of the present invention. It is sectional drawing for demonstrating the manufacturing method of the optical disk by one Embodiment of this invention. It is sectional drawing for demonstrating the manufacturing method of the optical disk by one Embodiment of this invention. It is a top view for demonstrating operation | movement of the conveying apparatus by one Embodiment of this invention. FIG. 8A is a top view schematically showing the configuration of the conventional substrate transfer apparatus, and FIG. 8B is a side view schematically showing the configuration of the conventional substrate transfer apparatus. FIG. 9A is a top view for explaining the operation of the conventional substrate transfer apparatus, and FIG. 9B is a side view for explaining the operation of the conventional substrate transfer apparatus.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Substrate conveyance apparatus, 2 ... Drying furnace, 11 ... Conveyance means, 12 ... Arm, 13 ... Holding means, 21 ... Drive means, 22 ... Drive shaft, 23 ... belt, 51 ... substrate, 52 ... recording layer, 53 ... reflective layer, 54 ... protective layer, 55 ... adhesive layer, 56 ... second substrate, 57 ..Label layer

Claims (6)

In a substrate drying apparatus provided with a substrate transport device that transports a substrate coated with a dye on one main surface,
The substrate transfer device is
A transport means for transporting the substrate while holding the inner periphery of the substrate coated with the dye on one main surface;
And a driving means for driving the transport means.   2. The substrate drying apparatus according to claim 1, wherein the transport means transports the substrate while holding a center hole of the substrate.   2. The substrate drying apparatus according to claim 1, wherein the transport means transports the substrate while adsorbing an inner peripheral portion of the substrate. In a method for producing an optical disc having a recording layer made of a dye,
A coating process for coating a pigment on one principal surface of the substrate;
And a drying step of volatilizing the solvent contained in the pigment while holding the inner periphery of the substrate coated with the pigment.   5. The method of manufacturing an optical disc according to claim 4, wherein in the drying step, a center hole of the substrate is held.   5. The method of manufacturing an optical disc according to claim 4, wherein, in the drying step, the inner peripheral portion of the substrate is sucked.

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