JP2008165915A - Manufacture equipment of optical disk and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of an optical disk which can easily form a light transmission layer with a uniform thickness on an entire optical disk surface. <P>SOLUTION: Manufacturing equipment S of the optical disk used to manufacturing the optical disk D which has a recording layer 4 and a light transmission layer 6 on a substrate 2, is provided with; a stage 11 which rotates the substrate 2; a resin dropping section 16 which drops ultraviolet curing resin on the substrate 2; a light source 18 which irradiates the substrate 2 mounted on the stage 11 with radiation of predetermined bandpass; and a filter 20a which is arranged movably between the light source 18 and the substrate 2 arranged on the stage 11 and cuts or absorbs a wavelength component of predetermined bandwidth in the radiation. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present application relates to an apparatus for manufacturing an optical disc such as a DVD (Digital Versatile Disc).

  In recent years, an optical disk such as a DVD exists as a kind of data storage medium. The optical disc is, for example, formed by sequentially laminating a recording layer and a light transmission layer on a substrate, and at least one of recording and reproduction of an information signal is performed by light incident from the light transmission layer side. The light transmission layer is formed by forming a cured film on the surface of a substrate on which a recording layer is formed using an ultraviolet curable resin.

  The light transmission layer is manufactured by, for example, a spin coating method, a film transfer method, a sheet method, or the like. As an example, in the spin coating method, a liquid resin is dropped on the surface of the base material while rotating the base material, so that the entire surface of the base material is uniformly stretched by the centrifugal force of rotation. By extending, the cured film is formed over the entire surface of one side of the substrate. (For example, patent document 1 or 2).

JP 2003-33713 A JP 2003-233936 A

  However, in the conventional spin coating method, it is difficult to maintain uniformity over the entire disk surface due to various circumstances such as changes in the viscosity of the ultraviolet curable resin depending on the manufacturing environment, etc., and the film thickness of the cured film formed on the entire disk surface Tends to be non-uniform. For this reason, an optical aberration occurs during recording / reproduction, and there is a problem that information signals cannot be reproduced or recorded stably.

  As one of the solutions, there is a method of increasing the diffusibility by lowering the viscosity of the resin by heating the resin. However, as a demerit in this case, there is a significant system change and accompanying increase in equipment investment. It is done.

  Therefore, in order to solve an example of such a problem, the present application aims to provide a method of manufacturing an optical disc that can easily form a light transmission layer with a uniform thickness over the entire surface of the optical disc.

  In order to solve the above-described problem, an optical disk manufacturing apparatus according to claim 1 of the present application has a recording layer (4) and a light transmission layer (6) on a circular substrate (2), and light is transmitted from the light transmission layer side. Is an optical disk manufacturing apparatus (S) in which at least one of recording and reproduction of information is performed with respect to a recording layer, and a stage on which the substrate is placed and rotated about the center of the substrate as a rotation axis ( 11), a resin dropping unit (16) for dropping an ultraviolet curable resin on the substrate placed on the stage, and a wavelength component in the ultraviolet region and a wavelength longer than the ultraviolet region with respect to the substrate placed on the stage A filter that is movably disposed between a light source (18) that irradiates radiation including a wavelength component in a region, and a substrate disposed on the stage and that cuts or absorbs the wavelength component in the ultraviolet region of the radiation. And 20a), and having a.

  Further, the optical disk manufacturing apparatus according to claim 3 has a recording layer and a light transmission layer on a circular substrate, and at least one of recording and reproduction of information with respect to the recording layer when light is incident from the light transmission layer side. An optical disk manufacturing apparatus in which a substrate is placed and the substrate is rotated about the center of the substrate as a rotation axis, and an ultraviolet curable resin is dropped onto the substrate placed on the stage. And a light source for irradiating the substrate placed on the stage with radiation including a wavelength component in the ultraviolet region and a wavelength component in a longer wavelength region than the ultraviolet region, the light source and the substrate disposed on the stage, And a second filter that cuts or absorbs wavelength components other than the ultraviolet region of the radiation, and a second filter that cuts or absorbs wavelength components in the ultraviolet region, Comprise configured filter unit (20), and said first and second switching means for switching the filter (30), characterized by having a.

  In the optical disk manufacturing method according to claim 6 of the present invention, a recording layer and a light transmission layer are sequentially laminated on a substrate, and information signals are recorded and reproduced by light incident from the light transmission layer side. A method of manufacturing an optical disc in which at least one of them is performed, wherein a liquid ultraviolet curable resin is dropped on a recording layer of the substrate, the temperature distribution on the surface of the substrate is controlled by a heating means, and the center of the substrate is centered. A first step of diffusing the ultraviolet curable resin on the recording surface while rotating the substrate as a rotation axis; and a second step of curing the diffused ultraviolet curable resin by an ultraviolet irradiation means to form the light transmission layer. A light source that irradiates radiation including a wavelength component in the ultraviolet region and a wavelength component in a longer wavelength region than the ultraviolet region as the heating means and a wavelength component in the ultraviolet region. Characterized in that as said ultraviolet light irradiation means with use of a heat source constituted by the filter using said light source.

  Hereinafter, the best embodiment of the present application will be described with reference to the accompanying drawings.

  First, an optical disk manufactured by the optical disk manufacturing apparatus of the present application will be described with reference to FIG.

  As shown in FIG. 1, the optical disc D has an annular substrate 2 having a hole 2a in the center, and the substrate 2 is made of a resin material such as acrylic resin, polycarbonate (PC) resin, polyolefin resin, or the like. It is made of glass material or the like. On one surface of the substrate 2, pits and grooves unevenness 2b corresponding to information signals are formed by injection molding, and the surface on which the pits and grooves are formed is a recording surface. On the recording surface, for example, a recording layer 4 made of any one of an rewritable optical recording layer, a write once optical recording layer, and a phase change optical recording layer is provided.

  Further, the light transmission layer 6 is formed on the surface of the recording layer 4 by, for example, spin coating. In the light transmission layer 6, an ultraviolet curable resin is formed on the entire surface of the optical disk D with a uniform film thickness.

  The optical disc D formed by sequentially laminating the recording layer 4 and the light transmission layer 6 on the substrate 2 performs at least one of recording and reproduction of information signals by light incident from the light transmission layer 6 side. It has come to be.

  Next, an optical disk manufacturing apparatus for forming a light transmission layer will be described with reference to FIGS.

  The optical disk manufacturing apparatus S of the present embodiment drops a liquid resin made of an ultraviolet curable resin onto the surface of the substrate 2 while rotating the substrate 2 on which the recording layer 4 is formed with the center as a rotation axis. 6 is a device for forming a cured film of 6 with a uniform film thickness over the entire surface of the optical disk D.

  As shown in FIG. 2, the optical disc manufacturing apparatus S includes a stage 11 on which a substrate 2 on which a recording layer 4 is formed, a rotating mechanism unit 14 that rotates the stage 11, and UV curing on the substrate 2. A filter unit 20 including a resin dripping unit 16 for dripping resin, a light source unit 18 for irradiating the substrate 2 with radiation, and a filter 20a disposed movably between the light source unit 18 and the substrate 2; It is comprised including. Each unit 14, 16, 18, 20, 25 is controlled by the system control unit 30.

  The stage 11 is formed in a substantially circular shape, and a projection formed in substantially the same shape as the inner diameter of the substrate 2 is provided at the center thereof. The protrusion is provided with a fixing means for fixing the substrate 2, and the substrate 2 is detachably fixed.

  The rotation mechanism unit 14 includes a spindle motor for rotating the stage, and is connected to the stage 11 via a bearing (not shown). The rotation mechanism unit 14 is managed by the system control unit 30 and controls the rotation speed of the spindle motor by controlling the rotation speed of the spindle motor. Thereby, the system control unit 30 can control the rotation state of the substrate 2.

  The resin dripping unit 16 includes a tank for storing an ultraviolet curable resin (not shown), a supply nozzle 16a for guiding the ultraviolet curable resin to a specified position on the substrate, and a predetermined amount of the ultraviolet curable resin from the tank (not shown) to the supply nozzle 16a. And a supply amount adjusting means to be supplied. The resin dropping unit 16 is managed by the system control unit 30 and controls the supply amount adjusting means to control the dropping amount of the ultraviolet curable resin dropped onto the substrate 2 from the supply nozzle 16a. Yes. Thereby, the system control unit 30 can control the dripping state of the ultraviolet curable resin.

  The light source unit 18 includes, for example, an irradiation unit that irradiates a predetermined amount of radiation, an adjustment unit that adjusts the light amount, and a moving unit that moves the main body of the light source unit 18 in the vertical direction with respect to the substrate 2. Configured and disposed on the substrate 2. The light source unit 18 can change the radiation irradiation region by moving the main body away from or close to the substrate 2.

  Further, the radiation includes a wavelength component in an ultraviolet region for curing the ultraviolet curable resin and a wavelength component in a longer wavelength region than the ultraviolet region for heating the substrate 2.

  The light source unit 18 is managed by the system control unit 30, and irradiates the substrate 2 with radiation with a predetermined amount of light by irradiating the substrate 2 with the main body approaching or moving away from the substrate 2. Irradiation is possible.

  The filter unit 20 includes, for example, a filter 20a formed of quartz glass that cuts or transmits only a wavelength component in a specific band of the radiation, a moving unit that moves the filter in the left-right direction with respect to the substrate 2, and the filter 20a. And a housing that houses the housing.

  For example, the filter 20a is configured to cut without transmitting the wavelength component by reflecting or absorbing when the wavelength component (for example, 200 to 400 nm) in the ultraviolet region included in the radiation is incident. Therefore, the filter 20a transmits wavelength components other than the ultraviolet region. Specifically, the filter 20a is formed by depositing titanium oxide or the like on the surface of quartz glass. Further, the filter 20a is formed so that a wavelength component other than the ultraviolet region transmits more in the outer region than in the inner region.

  The filter unit 20 is managed by the system control unit 30 to control the moving means, and the filter 20a is interposed between the substrate 2 and the light source unit 18, or the filter 20a is moved into the housing to It is removed from the space between the light source unit 18 and the like.

  For example, if the filter 20a is interposed between the light source unit 18 and the substrate 2, the wavelength component in the ultraviolet region can be cut and the wavelength component other than the ultraviolet region can be transmitted. Therefore, it is possible to irradiate only wavelength components other than the ultraviolet region. In this way, it is possible to heat the ultraviolet curable resin (or the substrate) without curing the ultraviolet curable resin dropped on the substrate 2 and to improve the fluidity of the ultraviolet curable resin. . Further, in the filter 20a, the outer region is more easily transmitted with radiation than the inner region, so that the outer peripheral region of the substrate 2 is heated more than the inner peripheral region. Thereby, the fluidity of the ultraviolet curable resin in the outer peripheral region can be increased more than the inner peripheral region of the substrate 2, and the ultraviolet curable resin can be more suitably diffused on the substrate 2.

  On the other hand, by moving the filter 20a into the housing by the moving means and removing it from between the light source unit 18 and the substrate 2, it becomes possible to irradiate the substrate 2 with radiation including wavelength components in the ultraviolet region. If it does in this way, it will become possible to harden the ultraviolet curable resin dripped on the board | substrate 2. FIG.

  The system control unit 30 includes a central processing unit (CPU) having a calculation function, a working RAM, and a ROM that stores various data and programs. The CPU executes various programs stored in the ROM, for example, thereby controlling the units 14, 16, 18, and 20, and overall control of the optical disc manufacturing apparatus S.

  The system control unit 30 adjusts the supply amount of the ultraviolet curable resin dripped onto the substrate 2 while controlling the rotation of the stage 11 with a predetermined specified value, moves the filter 20a, and the light amount of the light source unit 18 The substrate 2 is irradiated with a predetermined band of radiation.

  More specifically, the system control unit 30 moves the filter 20 a between the light source unit 18 and the substrate 2 disposed on the stage 11 when diffusing the ultraviolet curable resin on the substrate 2. The surface of the substrate 2 is set (controlled) in a predetermined temperature distribution state by irradiating the substrate 2 with radiation containing a wavelength component in a longer wavelength region than the ultraviolet region. In addition, when the system control unit 30 cures the diffused ultraviolet curable resin to form the light transmission layer 6, the filter 20 a is interposed between the light source unit 18 and the substrate 2 disposed on the stage 11. The substrate 2 is controlled to be irradiated with radiation containing a wavelength component in the ultraviolet region and a wavelength component having a longer wavelength than the ultraviolet region.

  As described above, according to the optical disk D manufacturing apparatus S of the present embodiment, the filter 20a may be interposed or removed between the light source unit 18 and the substrate 2 at a predetermined timing. Since the optical disk D can be easily manufactured without changing the system, the manufacturing cost can be reduced. Moreover, since the process of heating and curing the ultraviolet curable resin can be performed in the same coater, space saving can be achieved.

  As another embodiment, as shown in FIG. 3, the filter unit 20 includes a first filter 20 a that cuts or absorbs wavelength components other than the ultraviolet region and transmits only the wavelength components in the ultraviolet region, and an ultraviolet region. A second filter 20b that cuts or absorbs the wavelength component and transmits only the wavelength component other than the ultraviolet region. When the system control unit 30 diffuses the ultraviolet curable resin on the recording surface, the second filter 20b is prepared. When the second filter 20b is interposed between the light source unit 18 and the substrate 2 and the diffused ultraviolet curable resin is cured to form the light transmission layer 6, The second filter 20b is moved into the housing, removed from between the light source unit 18 and the substrate 2, and switched to the first filter 20a, and the first filter 20a is replaced with the light source unit 18 and the substrate 2. It may also be controlled so as to be interposed between.

  In this way, when the ultraviolet curable resin is cured, the radiation of the wavelength component other than the ultraviolet region is cut, and the radiation of only the wavelength component of the ultraviolet region is irradiated to the substrate 2, so that extra heat is applied to the substrate. Since the optical disk D can be manufactured without giving to 2 etc., it becomes possible to easily suppress the warpage of the substrate 2 due to the influence of heat.

  In addition, the light source part 18 and the filter part 20 of this embodiment function as a heating means of this application, and the light source part 18 of this embodiment functions as an ultraviolet irradiation means and a light source of this application. Further, the system control unit 30 of the present embodiment functions as a control unit and a filter switching unit of the present application.

  Next, an example of forming a light transmission layer on an optical disc using an optical disc manufacturing apparatus will be described.

<Example 1>
In the first embodiment, the optical disk D is manufactured by heating or curing the ultraviolet curable resin by interposing or removing the filter 20a between the light source unit 18 and the substrate 2 at a predetermined timing. Yes.

  First, in FIG. 2, the system control unit 30 defines in advance a state in which the substrate 2 on which the recording layer 4 having a concavo-convex portion is formed is attached to the stage 11 with the film formation surface facing upward. The amount of liquid UV curable resin dripped onto the recording surface by the resin dripping unit 16 and the radiation irradiated from the light source unit 18 while rotating the substrate 2 while driving the spindle motor at the rotated speed (low speed). Control the amount of light and irradiation time. Further, the system control unit moves the filter, and interposes the filter 20 a between the light source unit 18 and the substrate 2. Thereby, a liquid ultraviolet curable resin is dropped on the recording layer 4 of the substrate 2, and the ultraviolet curable resin is diffused on the surface of the recording layer 4 by the centrifugal force generated by the rotation of the substrate 2.

  In addition, the system control unit 30 controls the position of the filter 20a or the position of the light source unit 18 so that the temperature of the outer peripheral region of the substrate 2 due to the irradiation of radiation from the light source unit 18 is higher than the temperature of the inner peripheral region. It comes to control.

  Next, the system control unit 30 drives the motor at a predetermined number of rotations (high speed), and further diffuses the ultraviolet curable resin to the outside of the substrate 2, and the filter 20 a is connected to the light source unit 18 at a predetermined timing. The substrate is retracted and removed from the substrate 2, the ultraviolet curable resin is cured to form the light transmission layer 6, and the process is terminated.

<Example 2>
While Example 1 heats or cures the ultraviolet curable resin by interposing or removing one filter between the light source part and the substrate, Example 2 uses two filters, The optical disk D is manufactured by heating or curing the ultraviolet curable resin by switching the filter and interposing between the light source unit 18 and the substrate 2.

  First, in FIG. 3, the system control unit 30 predefines the substrate 2 on which the recording layer 4 having a concavo-convex portion formed on the surface is attached to the stage 11 with the film formation surface facing upward. The amount of liquid UV curable resin dripped onto the recording surface by the resin dripping unit 16 and the radiation irradiated from the light source unit 18 while rotating the substrate 2 while driving the spindle motor at the rotated speed (low speed). Control the amount of light and irradiation time. Further, the system control unit 30 moves the second filter 20 b and interposes the second filter 20 b between the light source unit 18 and the substrate 2. Thereby, a liquid ultraviolet curable resin is dropped on the recording layer 4 of the substrate 2, and the ultraviolet curable resin is diffused on the surface of the recording layer 4 by the centrifugal force generated by the rotation of the substrate 2.

  Further, the system control unit 30 controls the position of the second filter 20b or the position of the light source unit 18 so that the temperature of the outer peripheral region of the substrate 2 due to the irradiation of radiation from the light source unit 18 is higher than the temperature of the inner peripheral region. It controls to become.

  Next, the system control unit 30 drives the motor at a predetermined number of rotations (high speed), and further diffuses the ultraviolet curable resin to the outside of the substrate 2, while at the predetermined timing from the second filter 20 b. Switching to the first filter 20a, the first filter 20a is interposed between the light source unit 18 and the substrate 2, the ultraviolet curable resin is cured to form the light transmission layer 6, and the process is terminated.

  In addition, this embodiment is one form and is not limited to this form. For example, in this embodiment, when the ultraviolet curable resin is diffused on the substrate 2, the filter 20a is moved so that the temperature of the outer peripheral region of the substrate 2 is controlled to be higher than the inner peripheral region. By controlling the position of the light source, the temperature of the outer peripheral region of the substrate 2 may be controlled to be higher than that of the inner peripheral region. Further, the wavelength component other than the ultraviolet region differs depending on the type of the ultraviolet curable resin, and may be a frequency at which the ultraviolet curable resin is not cured. In addition, the components may be appropriately combined and integrated, or may be changed to a commonly used component.

It is sectional drawing which shows the optical disk manufactured by the optical disk manufacturing method of this application. It is a figure which shows the schematic structural example of an optical disk manufacturing apparatus. It is a figure which shows the schematic structural example in the other Example of the optical disk manufacturing apparatus.

Explanation of symbols

D optical disk S optical disk manufacturing apparatus 2 substrate 4 recording layer 6 light transmission layer 11 stage 16 resin dropping unit 18 light source unit 20a filter 20 filter unit 30 system control unit

Claims (7)

An optical disc manufacturing apparatus having a recording layer and a light transmission layer on a circular substrate, wherein light is incident from the light transmission layer side and at least one of information recording and reproduction is performed on the recording layer,
A stage on which the substrate is placed and rotates the substrate about the center of the substrate as a rotation axis;
A resin dropping section for dropping an ultraviolet curable resin on the substrate placed on the stage;
A light source for irradiating the substrate placed on the stage with radiation containing a wavelength component in the ultraviolet region and a wavelength component in a longer wavelength region than the ultraviolet region;
A filter that is movably disposed between the light source and a substrate disposed on a stage and that cuts or absorbs a wavelength component in an ultraviolet region of the radiation;
An optical disk manufacturing apparatus comprising: When the liquid ultraviolet curable resin is dropped and diffused on the recording layer of the substrate, the filter is moved between the light source and the substrate disposed on the stage, so that the wavelength in the wavelength region longer than the ultraviolet region. By setting the surface of the substrate to a predetermined temperature distribution state by irradiating the substrate with radiation containing components,
When the diffused ultraviolet curable resin is cured to form the light transmission layer, the filter is removed from between the light source and the substrate disposed on the rotation stage, and the wavelength component in the ultraviolet region and the ultraviolet region 2. The optical disk manufacturing apparatus according to claim 1, further comprising control means for irradiating the substrate with radiation containing a long wavelength wavelength component. An optical disc manufacturing apparatus having a recording layer and a light transmission layer on a circular substrate, wherein light is incident from the light transmission layer side and at least one of information recording and reproduction is performed on the recording layer,
A stage on which the substrate is placed and rotates the substrate about the center of the substrate as a rotation axis;
A resin dropping section for dropping an ultraviolet curable resin on the substrate placed on the stage;
A light source for irradiating the substrate placed on the stage with radiation containing a wavelength component in the ultraviolet region and a wavelength component in a longer wavelength region than the ultraviolet region;
A first filter that is movably disposed between the light source and a substrate disposed on the stage and that cuts or absorbs wavelength components other than the ultraviolet region of the radiation, and cuts or absorbs wavelength components of the ultraviolet region. A filter unit including a second filter;
Filter switching means for switching between the first and second filters;
An optical disk manufacturing apparatus comprising:   The position of the light source is controlled so that the temperature of the outer peripheral region of the substrate is higher than the temperature of the inner peripheral region when the ultraviolet curable resin is diffused on the recording surface. Or an optical disk manufacturing apparatus according to 3 above.   The optical disk manufacturing apparatus according to claim 1 or 3, wherein the wavelength component of the light source in the ultraviolet region is a wavelength component of 200 to 400 nm. A method of manufacturing an optical disc, wherein a recording layer and a light transmission layer are sequentially laminated on a substrate, and at least one of recording and reproduction of an information signal is performed by light incident from the light transmission layer side,
A liquid ultraviolet curable resin is dropped on the recording layer of the substrate, the temperature distribution on the surface of the substrate is controlled by a heating means, and the ultraviolet curable resin is rotated while the substrate is rotated about the center of the substrate. A first step of diffusing on the recording surface;
A second step of forming the light transmission layer by curing the diffused ultraviolet curable resin by an ultraviolet irradiation means,
As the heating means, a heat source composed of a light source that irradiates radiation including a wavelength component in the ultraviolet region and a wavelength component in a longer wavelength region than the ultraviolet region and a filter that cuts or absorbs the wavelength component in the ultraviolet region and the ultraviolet light A method for producing an optical disc, wherein the light source is used as an irradiating means.   7. The method of manufacturing an optical disc according to claim 6, wherein, in the first step, the position of the heating means is controlled so that the temperature of the outer peripheral region of the substrate is higher than the temperature of the inner peripheral region.

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