JPS61273757A - Reproducing device for information recording carrier - Google Patents

Abstract

PURPOSE:To reduce greatly the quantity of eccentricity between an uneven circle for a transferred information signal and a center hole by providing a TV monitor for a TV camera and a fixture which fixes a flange and a stamper backing material. CONSTITUTION:A bolt 20 with a clearance of 0.5mm is inserted into the bolt fixing hole 19 of the flange 8 and engaged threadably with the screw hole 2a of the stamper backing material 2 to clamp the flange 8 and stamper backing material 2 in one body. The surface of a metallic stamper 1 is coated with radiation setting resin 4 and a substrate 5 of glass or plastic where projections and recesses for the information signal is to be transferred and copied is mounted thereupon. At this time, the clearance between the center hole 21 of the substrate 5 and a center axis 6' of rotation is set to <=15mum. Consequently, the quantity of eccentricity between a circle 3 of projections and recesses for an information signal which is provided to a metallic stamper 1 and the center axis 6' of rotation used for the alignment of the substrate 5 to be copied and reproduced is decreased to <=10mum and the quantity of eccentricity between the circle of projections and recesses for the transferred information signal and the center hole is decreased to <=30mum.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an information recording carrier duplicating apparatus, and particularly to an information recording carrier duplicating apparatus suitable for back production of an information recording carrier with extremely small eccentricity.

[Background of the invention]

A radiation curable resin is applied to the surface of a glass or transparent plastic substrate, and after the information signal irregularities of a metal stamper are transferred, the radiation curable resin is irradiated with radiation to harden it to reproduce an information recording carrier. The conventional information record carrier duplicating device used is disclosed in Japanese Patent Laid-Open No. 55-152028 and ) (Harverkorn van Ri, C.
Jsewijk et al.: Mannfactory of L
a5er vision video discs b
ya photopoly-merization
process, Ph1lips Technica
l Review40, 10.287-297 (19
82).

A method of aligning the uneven circle for information signals with the center hole of the substrate in this information recording carrier duplicating apparatus and problems thereof will be explained with reference to the drawings.

FIG. 6 is a sectional view of a main part of an alignment mechanism of a conventional information recording carrier duplication device.

In FIG. 6, reference numeral 1 denotes a metal stamper on which a concave and convex circle 3 for an information signal is formed. This metal stamper 1 is set and fixed to a stamper backing material 2 using an adhesive or the like. A center hole is made in this stamped backing material 2 concentrically with the concave and convex circle 3 for the information signal, and an alignment pin 6 is inserted and fixed therein. After that, a radiation-curing resin 4 is applied on the metal stamper 1, a center hole of a glass or transparent plastic substrate 5 is inserted into the centering pin 6, and a radiation is irradiated from above the substrate 5. By curing the cured resin 4 and peeling off the boundary between the radiation cured resin 4 and the metal stamper 1, an information recording carrier is obtained.

As described above, the information signal uneven circle 3 of the metal stamper 1 is aligned with the center hole of the substrate 5. According to this alignment method, when forming the center hole of the stamper backing material 2, Due to the eccentricity error, the fitting error between the center hole and the centering pin 6, and the fitting error between the centering pin 6 and the substrate 5, the information is transferred to the center hole of the information recording carrier (that is, the center hole of the substrate 5). The amount of eccentricity with respect to the circle of the unevenness for the information signal is always kept below the desired value of 30 μm [for example, VIR (Video Inf.
30μm for recording)
The problem was that it was difficult to secure the following:

[Purpose of the invention]

The present invention improves the problems of the prior art described above, and the eccentricity between the circle of the transferred information signal unevenness and the center hole is 30 μm.
The object of the present invention is to provide an information record carrier duplicating device capable of producing the following information record carriers.

[Summary of the invention]

The structure of the information recording carrier duplication device according to the present invention is such that a radiation-curable resin is applied to the surface of a metal stamper whose surface is formed with unevenness for information signals, which is fixed on a stamper backing material, and a substrate is placed on top of the metal stamper. Then, the radiation-cured resin is cured by irradiating radiation from above the substrate, and the boundary between the radiation-cured resin and the metal stamper is peeled off, thereby producing an information recording onto which the information signal unevenness has been transferred. An information recording carrier duplication device used for back-producing a carrier includes a rotational center shaft provided with a flange, a drive device for rotationally driving this rotational center shaft, and a center hole placed on the flange, with a center hole located at the center of rotation. A stun/<m nail material that fits with the shaft with a clearance, an eccentricity correction mechanism that can displace the stamper backing material in the radial direction of the stamper backing material on the flange, and a nail material fixed on the stamper backing material. a microscope capable of detecting irregular circles for information signals of a metal stamper, a TV right camera connected to the microscope, a TV monitor for the TV right camera, the flange and the stamper backing material; A fixing tool capable of fixing the.

[Embodiments of the invention] Hereinafter, the present invention will be explained by examples.

, 171 is a schematic vertical cross-sectional view showing the main parts of an information recording carrier duplicating device according to an embodiment of the present invention, and Fig. 2 is a cross-sectional view showing an integral part of the metal stamper and stamper backing material in Fig. 1. Fig. 3 is a schematic cross-sectional view of the main parts of the information recording carrier duplication device according to Fig. 1 after the radiation curing resin has been cured, and Fig. 4 is a schematic cross-sectional view of the information recording carrier duplication device according to Fig. 1. FIG. 2 is a cross-sectional view showing an information recording carrier manufactured by.

In the figure, parts with the same numbers as in Figure E6 are the same parts. 6° is the rotation center axis on which the flange 8 is integrally provided, and the center hole 7 of the stamper backing material 2 to which the metal stamper 1 is fixed is placed on the flange 8 at the rotation center axis 6'VC. It can be inserted and placed. The rotation center shaft 6' is supported by a housing 24 via a bearing 23, and a boot IJ-25 is attached to the lower end. Reference numeral 14 denotes an electric motor related to a drive device disposed below the housing 24, and the rotation is carried out via a belt 27 that is passed around the pulley 25 and a boot IJ 26 attached to the shaft end of the electric motor 14. The central shaft 6' is rotationally driven. The eccentricity between the center of rotation and the center of the rotation center axis 6 degrees, the so-called amplitude of rotation shooting, is at most 5 μm. 11 is placed on flange 8! A microscope capable of detecting a concave and convex circle 3 for information signal of a metal stamper 1 fixed to a stamper backing material 2 that has been
2 is a TV camera connected to this microscope 11, and 13 is a TV monitor for this TV camera 12.

Reference numeral 10 denotes a tapper lever relating to an eccentricity correction mechanism that can push the outer circumferential side of the stamper backing material 2 in the radial direction of the stamper backing material 2.

The operation of the information recording carrier duplicating apparatus having such a five-way configuration will be explained.

An integrated product (,
? A center hole 7, which is approximately 0.5 a larger than the diameter of the rotational center axis 6°, is bored by lathe processing in the center of FIG. 2, concentrically with the information signal uneven circle 3. In this case, the eccentricity between the center of the uneven circle 3 for information signals and the center hole 7 is at most 20
It is μm. A screw hole 26 is bored on the back surface of the stamper backing material 2 at a position facing the bolt fixing hole 19 of the flange 8. Grease 9 is applied to the upper surface of the flange 8, the integrated product is placed on it, and the center hole 7 of the stamper backing material 2 and the rotation center shaft 6'' are fitted.The microscope 11 is placed above the metal stamper 1. Set the camera to the focal point position.

Here, when the information record carrier duplication device is turned on, the electric motor 1
4 is driven (for example, 5 rpm), and the rotation center axis is 6°.
, the flange 8 integrated with this, and this flange 8
The integral part covered with grease 9 rotates. An arc 15 of the information signal unevenness circle 3 observed with the microscope 11 is displayed on the screen of the TV monitor 13, and the arc 15 swings in the direction of the arrow 16 (left and right). Half of this photographic amount is the eccentricity between the information signal unevenness circle 3 and the rotation center axis °6'. When the arc 15 swings to the farthest right on the screen of the TV monitor 13 (to the right in Figure 1), the tapper lever 1
0 is activated, the stamper backing material 2 is pushed and slightly moved to the left. The arc 15 at this time is displayed on the screen of the TV monitor 13, and when the arc 15 swings most to the right, the tapper lever 10 is activated again to push the stamper backing material 2, causing it to move slightly to the left. This operation is repeated, and when the amount of eccentricity reaches a predetermined value (10 μm or less), the eccentricity correction operation ends.
Electric motor 14 stops.

To the bolt fixing hole 19 of the flange 8, o
, bolt 20 related to a fixture having a clearance of sm
is inserted and screwed into the screw hole 2G of the stamper backing material 2, and the flange 8 and the stamper backing material 2 are fastened together. Due to this K, the amount of eccentricity is fixed to the above-mentioned 10 μm or less. A radiation-curing resin 4 is applied to the surface of the metal stamper 10 (see Figure 3), and a glass or transparent plastic substrate 5 on which information signal irregularities are to be transferred and reproduced is applied.
is placed. At this time, even if the clearance between the center hole 21 of the substrate 5 and the rotation center axis 6° is at most 15 μm or less, radiation (for example, ultraviolet rays with a wavelength of 355 nm) is irradiated from above the substrate 5 for a predetermined period of time. The radiation cured resin 4 is cured. The boundary between the radiation-cured resin 4 and the metal stamper 1 is peeled off, and the information recording carrier 2 has a 3° concavo-convex circle for a desired information signal transferred thereon, as shown in Figure 4.
2 is obtained.

In this information recording carrier 22, the amount of eccentricity between the transferred information signal uneven circle 3' and the center hole 21 is 30 μm or less.

According to the embodiment described above, the eccentricity between the uneven circle 5 for the information signal provided on the metal stamper 1 and the rotation center axis 6' used for centering the substrate 5 to be transferred and duplicated is set to 10 μm. Therefore, the eccentricity between the center hole 21 of the information recording carrier 22 manufactured by this information recording carrier duplication apparatus and the concave-convex circle 3' for the transferred information signal can be made 30 μm or less. There is an effect that it can be done.

Figure 5 shows an information recording carrier copy 4 according to another embodiment of the present invention! FIG.

In Figure 5 of this spear, the parts with the same numbers as in Figure 1 are the same parts. This embodiment is the same as the information record carrier duplicating apparatus according to Figure 1 above, except for the eccentricity correction mechanism. The eccentricity correction mechanism of this embodiment includes a circumferential groove 17 with an inclined surface bored on the lower surface of the two stamper backing materials, and an inclined surface of the circumferential groove 17 provided below the two stamper backing materials. It is combined with a tapper pin 18 which has an inclined surface at its tip that engages with the surface and is moved upward by a tapper lever 10''. 28 is a spring for pushing back the tapper pin 18 downward.

The operation of the information recording carrier duplicating device configured in this way is different from the embodiment according to the above-mentioned figure 1.
When the arc 15 swings to the farthest right on the screen of 3, the tapper lever 10' is activated, the tapper pin 18 moves upward, and the inclined groove 17 is pushed by the inclined surface of the tip of this tapper pin 18, and the two stamper backing materials are pressed. moves slightly to the left.

When this operation is repeated and the amount of eccentricity reaches a predetermined value (10 μm or less), the eccentricity correction operation is completed and the electric motor 14 is stopped. Other operations are exactly the same as those according to FIG.

The embodiment according to Figure 5 described above also has the effect of being able to manufacture an information recording carrier with an eccentricity of 30 μm or less, similar to the information recording carrier duplicating apparatus according to Figure 1 above.

〔Effect of the invention〕

As explained in detail above, according to the present invention, there is provided an information recording carrier duplication device capable of producing an information recording carrier in which the eccentricity between the transferred information signal uneven circle and the center hole is 30 μm or less. can do 0

[Brief explanation of the drawing]

FIG. 1 is a schematic vertical sectional view showing the main parts of an information recording carrier duplication apparatus according to an embodiment of the present invention, and FIG. ! ? Figure 1 is a cross-sectional view showing an integrated product of the metal stamper and stamper backing material; Figure 3 is a schematic cross-sectional view of the main parts of the information recording carrier duplicating device according to Figure 1 after the radiation curing resin has been cured; The spear 4 figure is 1. ? FIG. 1 is a sectional view showing an information record carrier manufactured by the information record carrier duplication apparatus according to the present invention, and FIG. FIG. 6 is a sectional view of a main part of a centering mechanism of a conventional information recording carrier duplicating device. 1... Metal stamper, 2, 2A... Stamper backing material, 3... Irregular circle for information signal, 3°... Irregular circle for transferred information signal, 4... Radiation curing Resin, 5...
・Substrate, 6°...rotation center axis, 7...center hole, 8.
...Flange, 10,10°...Tappa lever, 11
...Microscope, 12...TV camera, 15...TV
Monitor, 14... Electric motor, 17... Circumferential groove, 18...
... Tapper pin, 20... Fixing bolt, 21... Center hole, 22... Information recording carrier. No. 20 30 and 4 hangings

Claims (1)

[Scope of Claims] 1. A radiation curing resin is applied to the surface of a metal stamper, which is fixed to a stamper backing material and has irregularities for information signals formed on the surface, and a substrate is placed on this. The radiation curing resin is cured by irradiating radiation from above, and the boundary between the radiation curing resin and the metal stamper is peeled off to produce an information recording carrier having the information signal unevenness transferred thereto. The information recording carrier duplicating device used includes a rotation center shaft provided with a flange, a drive device for rotationally driving the rotation center shaft, and a center hole placed on the flange and having a clearance with the rotation center shaft. information on a stamper backing material that fits together with the stamper backing material, an eccentricity correction mechanism that can displace the stamper backing material in the radial direction of the stamper backing material on the flange, and a metal stamper fixed on the stamper backing material. A microscope capable of detecting a concavo-convex circle for signals, a TV camera connected to the microscope, a TV monitor for the TV camera, the flange, and the stamper backing material can be fixed. An information record carrier duplicating device characterized by having a fixing device. 2. The information recording carrier duplicating device according to claim 1, wherein the eccentricity correction mechanism is a tapper lever capable of pushing the outer circumferential side of the stamper backing material in the radial direction of the stamper backing material. 3. The eccentricity correction mechanism includes a circumferential groove with an inclined surface bored in the lower surface of the stamper backing material, and an inclined surface disposed below the stamper backing material and engaged with the inclined surface of the circumferential groove. 2. The information recording carrier duplicating device according to claim 1, which is combined with a tapper pin provided at the tip and moved upward by a tapper lever.