WO2012153503A1 - 情報記録媒体および情報記録媒体を保持する保持装置 - Google Patents
情報記録媒体および情報記録媒体を保持する保持装置 Download PDFInfo
- Publication number
- WO2012153503A1 WO2012153503A1 PCT/JP2012/002974 JP2012002974W WO2012153503A1 WO 2012153503 A1 WO2012153503 A1 WO 2012153503A1 JP 2012002974 W JP2012002974 W JP 2012002974W WO 2012153503 A1 WO2012153503 A1 WO 2012153503A1
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- WIPO (PCT)
- Prior art keywords
- recording medium
- information recording
- optical disc
- center
- holding
- Prior art date
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/2403—Layers; Shape, structure or physical properties thereof
- G11B7/24035—Recording layers
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/2403—Layers; Shape, structure or physical properties thereof
- G11B7/24047—Substrates
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers
- G11B7/263—Preparing and using a stamper, e.g. pressing or injection molding substrates
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers
- G11B7/266—Sputtering or spin-coating layers
Definitions
- the present application relates to a resin-made information recording medium having a thickness of less than 0.2 mm and a holding device for holding the information recording medium.
- a disc made of resin such as polycarbonate or polyolefin having a thickness of about 1.2 mm such as CD (compact disc), DVD (digital versatile disc), BD (Blu-ray disc) is rotated at a speed of 10,000 rpm or more.
- a metal, glass, or ceramic that has higher rigidity than the resin, but it is expensive.
- a disk having a thickness of about 0.1 mm has been proposed as a method using a resin (for example, Non-Patent Document 1).
- such a thin disk has a concentric circular inner hole and outer shape. By fitting the inner hole and the center cone on the side that clamps the disk, the center of the disk is aligned. It is carried out.
- a Thomson method of cutting with a thin blade such as a razor is often used for processing the inner and outer diameters of the disk.
- Patent Document 1 discloses a method of performing inner and outer diameter machining of a disk with a laser. When the laser cuts out, the pit row provided on the substrate is detected to find the center point of the pit row, and the positions of the inner diameter and the outer diameter at a predetermined distance from the center point are obtained.
- Patent Document 1 positioning is performed from a pit row on a substrate.
- Patent Document 2 discloses providing a positioning mark.
- Patent Document 3 discloses a method of providing a gradient toward the end of the inner hole of the disc so as to match the gradient of the disc support in order to eliminate the backlash with the disc support of the recording / reproducing apparatus caused by the thin disc. It is described in.
- One non-limiting exemplary embodiment of the present application provides an information recording medium in which an inner hole is not easily damaged and the eccentricity can be reduced, and a holding device that holds the information recording medium.
- An information recording medium is an information recording medium including a disk substrate formed of a resin and having a data area thickness of 0.2 mm or less, and is provided in an inner peripheral end area of the information recording medium.
- the step further comprises a step having a height of 1 mm or more and 3 mm or less, the step comprising an acute angle edge portion used for positioning the center of the information recording medium when rotating the information recording medium, and the acute angle edge portion
- the angle on the inner side of the cross section is 50 degrees or more and 80 degrees or less.
- the center of the information recording medium is positioned using the step provided in the inner peripheral end region of the information recording medium. Therefore, the eccentricity between the data area center and the rotation center of the information recording medium can be reduced.
- (A), (b), (c) and (d) are sectional views of an information recording medium according to an exemplary embodiment.
- (A) And (b) is sectional drawing which shows the manufacturing method of the information recording medium by example embodiment. It is sectional drawing which shows the manufacturing method of the information recording medium by example embodiment. It is sectional drawing which shows the manufacturing method of the information recording medium by example embodiment. It is sectional drawing which shows the manufacturing method of the information recording medium by example embodiment. It is sectional drawing which shows the manufacturing method of the information recording medium by example embodiment. It is sectional drawing which shows the manufacturing method of the information recording medium by example embodiment.
- (A) And (b) is sectional drawing which shows the holding
- (A) And (b) is a partial top view of the support part of the holding
- (A) And (b) is sectional drawing which shows the holding
- (A), (b), (c), (d), (e) and (f) are sectional views of an information recording medium according to an exemplary embodiment. It is sectional drawing which shows the holding
- the above-mentioned thin disk having a thickness of 0.1 mm has insufficient rigidity, and there is a problem that the roundness of the inner hole of the disk deteriorates during processing.
- the Thomson method in which the inner hole of the disk is cut with a thin blade, is prone to deformation due to the lack of strength of the blade.
- the variation of the inner diameter is about ⁇ 50 ⁇ m with respect to the target.
- the resin When processing with a laser, the resin is melted for one turn with heat and cut, so it is difficult to obtain a perfect circle at the overlapping part.
- An embodiment of the present invention provides an information recording medium that can prevent an inner hole from being damaged and reduce eccentricity, and a holding device that holds the information recording medium.
- An information recording medium is an information recording medium including a disk substrate formed of a resin and having a data area thickness of 0.2 mm or less, and is provided in an inner peripheral end area of the information recording medium.
- the step further comprises a step having a height of 1 mm or more and 3 mm or less, the step comprising an acute angle edge portion used for positioning the center of the information recording medium when rotating the information recording medium, and the acute angle edge portion
- the angle on the inner side of the cross section is 50 degrees or more and 80 degrees or less.
- the information recording medium includes, for example, a plurality of the steps, and at least one of the steps includes the acute edge portion.
- a holding device is a holding device that holds the information recording medium, and includes a holding unit that holds the information recording medium and a positioning unit that positions the center of the information recording medium.
- the positioning unit positions the center of the information recording medium by contacting the acute edge portion of the step.
- the positioning portion is, for example, movable along the rotation axis direction of the information recording medium, has a taper portion that is inclined with respect to the rotation axis direction, and includes the acute angle edge portion and the taper portion of the step.
- the center of the information recording medium is positioned by pressing.
- An information recording medium is an information recording medium including a disk substrate formed of a resin and having a data area thickness of 0.2 mm or less, and is provided in an inner peripheral end area of the information recording medium.
- the step further comprises a step having a height of 1 mm or more and 3 mm or less, and the side surface of the step is used for positioning the center of the information recording medium when the information recording medium is rotated.
- the angle between the side surface direction of the step cross section is not less than 80 degrees and not more than 100 degrees.
- An information recording medium which is one embodiment of the present invention is made of a thermoplastic resin having a thickness of 0.2 mm or less, and has a height of 1 mm to 3 mm and is concentric with the center of the data area inside the clamp area or the clamp area.
- An annular step is provided. Then, a positioning mechanism in contact with the stage provided on the information recording medium is provided in the disk holding part of the recording / reproducing apparatus so that the center of the rotating part of the recording / reproducing apparatus can coincide with the data center of the disk.
- An information recording medium holding method which is one embodiment of the present invention is a method in which a step having a circular height of 1 mm or more and 3 mm or less concentrically with the center of a data area is formed on an information recording medium having a thickness of 0.2 mm or less.
- an annular member that is formed on the inner side of the clamp region and that has an axially moving side surface and a tapered surface at least concentrically with the center of rotation is provided on the disk holding portion of the recording / reproducing apparatus.
- the data on the information recording medium can be brought into direct contact with the step or via an annular member that has a concentric side surface and a tapered surface that is concentric with the center of rotation and is divided in a circumferential direction that moves in the radial direction.
- a mechanism for matching the center of the area with the center of rotation of the disk holding portion is provided.
- a sheet-shaped resin substrate having a thickness of 0.2 mm or less is processed in the data area of the resin substrate when mounted in a mold after the inner and outer diameters are processed.
- the center of the data area is obtained from the unevenness, the sheet-like substrate is attached at a position coinciding with the center of the step in the mold, and heated and pressed.
- a sheet-like resin substrate having a thickness of 0.2 mm or less is processed into an inner diameter and an outer diameter and then mounted in a mold
- the data area of the resin substrate is used.
- the stamper is attached at a position where the center of the data area on the stamper forming the unevenness coincides with the center of the step in the mold
- the sheet-like substrate is removed from the inner hole and the outer Based on the diameter, it is attached to a mold and heated and pressed to form a step and a data area together on the information recording medium.
- the mold is slightly opened to allow compressed air to flow from the gap.
- the edge of the step on the information recording medium that comes into contact with the positioning member on the disk holding side is made an acute angle.
- the disk holding is positioned at the stage of the information recording medium with good roundness, not the inner hole of the information recording medium with poor roundness, the center and rotation of the data area of the disk
- the eccentricity with the center can be kept small.
- the edge of the step is made an acute angle, even if the discs are stacked with the inner hole passing through, the discs are separated at the stepped portion, so that they can be stacked in a skewer shape without a spacer, thereby increasing productivity.
- an optical disk is illustrated as an example of an information recording medium.
- the information recording medium is not limited to an optical disk, and may be an information recording medium that is rotated during recording and / or reproduction. That's fine.
- the information recording medium may be a magnetic disk, a magneto-optical disk, a bit patterned medium, a hologram disk, a near-field optical disk, a disk using plasmons, or the like.
- FIG. 1A to 1D are sectional views of an optical disc 100 according to a first embodiment of the present invention.
- An annular step 110 concentric with the center of the data area 102 is formed in the inner peripheral edge area 101 (clamp area or inside of the clamp area) of the optical disc 100.
- the side surfaces 110 a and 110 b of the step 110 are formed in a direction substantially perpendicular to the surface of the data area 102.
- the optical disc 100 in FIGS. 1A and 1B has one step and is recessed or protrudes from the data area 102.
- FIGS. 1C and 1D have two steps. In the case of (steps 110 and 120), the data area 102 is recessed and then returned to the original or protruded and then returned to the original. The strength of the two steps is higher than that of the first step.
- FIG. 22 is a cross-sectional view schematically showing the optical disc 100.
- the optical disk 100 includes a resin disk substrate 1. A groove shape having lands and grooves is formed on the disk substrate 1, and a recording layer 221, a reflective layer 222, and a protective layer 223 are sequentially formed thereon.
- the configuration shown in FIG. 22 is an example, and the optical disc is not limited to this.
- an optical disc including a four-layer structure of a transparent layer, a recording layer, a transparent layer, and a reflective layer from the light incident side may be used, or an optical disc without a reflective layer may be used. Further, it may be an optical disc in which concave or convex pits are formed instead of the groove shape.
- the thickness t of the data area 102 of the optical disc 100 is, for example, 0.2 mm or less. If the optical disc 100 is not rigid, a circular flat plate is brought close to the optical disc 100 and an air stream is allowed to flow between the optical disc 100 and the flat plate from the inner periphery to the outer periphery to rotate the optical disc 100 at 10,000 rpm or more. This is because the optical disc 100 is held so as to stick to the flat plate while maintaining a certain distance, but as the thickness of the optical disc 100 increases, the rigidity increases and does not follow the surface of the circular flat plate. Further, when the optical disk 100 becomes too thin, the warpage of the single body is large and it tends to be wrinkled. Therefore, the thickness of the optical disc 100 is, for example, 50 ⁇ m or more.
- the angle of the side surface direction of the cross section of the step 110 with respect to the surface direction of the data area 102 is, for example, 80 degrees or more and 100 degrees or less, and may be 85 degrees or more and 95 degrees or less. This is because the side face of the step 110 and the corresponding member are in contact with each other at the front, so that no side slip or the like occurs, and the small roundness of the step 110 can be utilized in the rotating system of the recording / reproducing apparatus.
- the height h (FIG. 23) of the step 110 on the optical disc 100 is, for example, not less than 1 mm and not more than 3 mm.
- the radius of curvature is equal to that of the optical disc 100.
- the radius of curvature on the inner peripheral side needs to be larger.
- the radius of curvature inside the step 110 of the optical disk 100 is 0.2 mm, and the optical disk 100 engages with a member whose radius of curvature inside the stage 110 of the optical disk 100 is larger by 0.1 mm.
- the height of the step 110 of the optical disc 100 needs to be greater than 0.7 mm, and is preferably 1.0 mm or more in order to form a straight portion instead of a curve at the 100 step 110. This is because if the height of the step 110 of the optical disc 100 is too low, the catch at the step 110 will be insufficient. On the other hand, if the step 110 is too high, the side surface of the step becomes thin and the strength is insufficient.
- the thickness of the side surface of the step 110 needs to be 40 ⁇ m to 50 ⁇ m.
- the height of the step 110 is desirably 3 mm or less, for example, 2 mm or less.
- the material of the optical disc 100 is preferably a polycarbonate resin or a polyolefin resin, which is a thermoplastic resin having excellent impact resistance and excellent heat processing.
- the resin may be another resin such as polypropylene.
- the disk substrate 1 is a resin substrate having an inner diameter and an outer diameter.
- the outer diameter is 120 mm and the inner diameter is 5 mm.
- the thickness of the disk substrate 1 is 0.1 mm.
- the resin is a polycarbonate resin.
- FIG. 1A and 2B are used to manufacture the optical disc 100 shown in FIG. 1A in the case where irregularities such as information signals and tracks are not formed in the data area of the disc substrate 1.
- FIG. explain. 2A is a cross-sectional view showing a state in which the mold is opened
- FIG. 2B is a cross-sectional view showing a state in which the mold is closed.
- the disk substrate 1 is still flat.
- the disk substrate 1 is in contact with the mirror surface board 2.
- a stamper 3 is attached to the mirror surface plate 4 with a stamper inner periphery presser 5 and a stamper outer periphery presser 6.
- the stamper 3 is formed with irregularities such as signals and tracks that become information to be transferred to the data area of the disk substrate 1.
- the stamper 3 is made of a metal such as nickel, and the inside diameter and the outside diameter are processed by a punch or the like. Since the stamper 3 is a metal whose hardness is higher than that of the resin, a roundness of the inner hole of 10 ⁇ m or less is obtained.
- the attachment of the stamper inner circumferential presser 5 to the mirror surface board 4 is not shown in FIG. 2 (a), but may be performed by any of screws, cams and suction.
- the stamper outer periphery presser 6 may be attached to the mirror surface board 4 with screws.
- the mirror surface plate 2 and the mirror surface plate 4 can be heated by flowing a medium from a temperature controller or by a heater or the like, and heated above the glass temperature so that the resin of the disk substrate 1 is softened and can be plastically deformed.
- the disk substrate 1 is mounted on the mirror surface plate 2, the stamper 3 is mounted on the mirror surface plate 4, and the air in the cavity 10 is evacuated through the suction passage 11 leading to the cavity 10 formed in the mold. .
- the bush 7 and the pole 9 are fitted through the ball bearing 8 to close the cavity 10, and the disk substrate 1 and the stamper 3 are connected.
- the unevenness on the stamper 3 is transferred to the disk substrate 1, and a step is formed on the disk substrate 1 by pressing the stamper presser 5 into the recess 2 a in the center of the mirror plate 2 inside the disk substrate 1.
- the press When a groove having a track pitch of 0.32 ⁇ m and a depth of 20 nm was formed, the press was transferred at 4 tons for 10 seconds, and the temperature of the mirror plate 2 and the mirror plate 4 was transferred at 180 ° C.
- the eccentricity between the center of the data area of the disk substrate 1 and the center of the step formed inside the disk substrate 1 could be 10 ⁇ m or less.
- the mirror plate 2 and the mirror plate 4 are slightly opened so that the protruding portion at the tip of the stamper inner circumferential retainer 5 is not separated from the inner hole of the disk substrate 1, and the suction path By supplying the compressed air to 11, it becomes easy to peel between the mirror surface board 2 and the disk substrate 1.
- a stamper inner periphery positioning 12 is provided on the inner periphery of the stamper 3 and defines a position where the stamper 3 is attached to the mold.
- the suction groove 13 is provided on the inner periphery of the mirror surface board 4 in a circular shape, and the stamper 3 is vacuum-sucked from the suction groove 13 and fixed to the mirror surface board 4.
- the mold shown in FIG. 4 is used.
- the shapes of the stamper inner circumferential presser 5 and the recess 2a provided at the center of the mirror surface board 2 are different from those in FIG. In FIG. 2 (a), it is one annular step, but in FIG. 4, a protrusion that becomes an annular rib is formed.
- the optical disk 100 of FIG. 1D can be realized by the combination of FIG. 3 and FIG.
- a cylindrical protrusion is provided in the center of the stamper inner periphery presser 5 or the stamper inner periphery positioning 12 so as to enter the inner hole of the disk substrate 1 so that the inner hole is positioned when the disk substrate 1 is conveyed.
- the disk substrate 1 has no inner hole and only the outer diameter is machined and is mounted in the mold, and a cylindrical protrusion is punched in the center of the stamper inner circumferential presser 5 or stamper inner circumferential positioning 12 in the mold.
- An inner hole may be formed in the disk substrate 1 in the mold so as to be fitted to the receiving side as a blade. In this case, positioning is performed on the outer periphery of the disk substrate 1.
- a place different from the data area for example, the inside of the data area may be sucked.
- a claw-shaped object may be thrust into the inner hole and then opened, held, and conveyed.
- the steps formed on the disk substrate 1 are formed on a plane that is substantially perpendicular to the plane that is the same as before the steps such as the data area are formed. This angle was formed to be 80 deg or more.
- the disk substrate 1 is in contact with the mirror surface board 2.
- a cylindrical receiving bush 17 is provided on the inner peripheral side of the mirror surface board 2 via a heat insulating material 16.
- the receiving bush 17 has an annular groove on the surface and is connected to the suction passage 18 to suck and fix the disk substrate 1 by suction.
- the mirror surface board 4 there is a mirror surface board 4 above the disk substrate 1, and a punch bush 20 is provided inside the mirror surface board 4 via a heat insulating material 19.
- the mirror surface plate 4 does not come into contact with the disk substrate 1. This is to prevent the irregularities formed in the data area on the disk substrate 1 from touching and breaking.
- the punch bush 20 and the receiving bush 17 are aligned with each other in the center axis, and can be fitted.
- the punch bush 10 and the receiving bush 17 are both provided with a heating mechanism (not shown).
- the heating mechanism may be one that causes a medium to flow from a temperature controller or one that is heated by a heater.
- a suction passage 21 is provided at the center of the punch bush 20 for closing the upper mold and the lower mold and forming the cavity 10 to evacuate the air in the cavity 10 to make a vacuum state.
- the disk substrate 1 is polycarbonate resin, the thickness is 0.1 mm, the inner diameter is 5 mm, the outer diameter is 120 mm, the outer diameter of the step is 15 mm, the height is 2 mm, the inner diameter of the data area is 50 mm, the outer diameter of the punch bush 20 and the receiving bush
- the outer diameter of 17 was 40 mm, the press was performed at 500 kgf for 10 seconds, and the temperature of the mirror surface plate 2 and the mirror surface plate 4 was 180 ° C.
- the mold was made of stainless steel and the heat insulating material was polytetrafluoroethylene, which is a fluororesin.
- FIG. 5 shows the case where the upper and lower molds have opposite center irregularities compared to FIG.
- the configuration of the pole 9 and the bush 7 of the guide post on the outside is also shown in the case where the upper mold and the lower mold are opposite.
- the configuration of FIG. 2 may be used.
- FIG. 1A Although only the mold corresponding to FIG. 1A is shown here, the mold corresponding to FIG. 1B to FIG. 1D is also compared with FIG. 2, FIG. 3, FIG. As can be seen, it can be made.
- the punch bush 20 is movable. Further, there is a protruding bush 22 between the mirror plate 4 and the punch bush 20, and the protruding bush 22 sandwiches the disk substrate 1 with the receiving bush 17 after the mold is closed.
- FIG. 6 shows a cross section rotated 90 degrees in the right half and the left half. In other words, the protruding bush 22 has a slit-like cross section instead of the same cross section. As a result, the protrusion bush 22 moves in the mirror surface plate 4 in the axial direction without play.
- the punch bush 20 and the projecting bush 22 are configured to project toward the cavity 10 side of the mold by a projecting mechanism (not shown) by air pressure or hydraulic pressure, and when the projecting force is not applied, a spring moves toward the upper mold. I'm retracting.
- FIGS. 7 (a) and 7 (b) a holding device 200 for an optical disc 100 according to a fifth embodiment of the present invention will be described with reference to FIGS. 7 (a) and 7 (b).
- the shape of the optical disc 100 is the shape shown in FIG.
- FIG. 7A is a diagram showing each member lump, and is divided into an optical disc 100, a support portion 30, and a presser portion 31.
- the support part 30 is made up of a rotating spindle 32, a clamp part 33, and a center pole. There are an annular member 35 concentrically fitted with the center pole 34 and a plurality of divided annular members 36 in contact with the annular member 35.
- FIGS. 8A and 8B show a state in which the support portion 30 is viewed from above and the annular member 35 is removed.
- FIGS. 8A and 8B both show the case where the annular dividing member 36 is divided into three parts in one round.
- the annular dividing member 36 is connected by a spring 37 and is adjusted in a direction in which it is contracted toward the annular member 35 side.
- FIG. 8A the annular dividing member 36 is connected by a spring 37 and is adjusted in a direction in which it is contracted toward the annular member 35 side.
- a spring 38 is arranged on the wall surface of the clamp portion 33 so as to push the annular dividing member 36 toward the annular member 35 side.
- the inner hole of the optical disc 100 has a diameter larger than the outer diameter of the annular member 35 at the fitting portion of the annular member 35.
- a spring 39 is provided between the annular member 35 and the clamp portion 33, and pushes the annular member 35 upward along the direction of the rotation axis 150.
- the annular member 35 and the annular dividing member 36 are concentric, and the contacting surfaces have the same inclined taper.
- the annular member 35 moves up and down in the axial direction, the annular dividing member 36 narrows in the radial direction. Or spread.
- the annular member 35 is pushed down to widen the annular dividing member 36 so that the outer peripheral surface of the annular dividing member abuts on the side surface of the step of the optical disc 100 so that the center of the optical disc 100 coincides with the center of the rotating support portion 30. Make out.
- the pressing portion 31 is configured to be fitted to the center pole 34 of the support portion 30, and includes a clamp portion 40, a cushion portion 41 that contacts the inside of the clamp portion 40, and a pressing plate 42 that presses the annular member 35 of the support portion 30.
- the push plate 42 is pushed toward the support portion 30 by a spring 44.
- the optical disc 100 does not fly during the rotation of the optical disc 100 because the optical disc 100 has an inner hole and allows the center pole 34 in the receiving portion 30 to pass through.
- the height of the step needs to be 1 mm or more and the step angle needs to be 80 deg or more. Also, the higher the step height, the easier it is to stay, but the thickness becomes thinner and the strength cannot be maintained. Therefore, the height of the step is preferably 3 mm or less, and desirably 2 mm or less.
- FIG. 9A is a diagram showing each member lump, and is divided into an optical disc 100, a support portion 30, and a presser portion 31.
- the support part 30 is made up of a rotating spindle 32, a clamp part 33, and a center pole.
- the annular member 45 is pushed up by the spring 47 in the axial direction of the center pole 34.
- the annular split member 46 is pushed radially outward by a spring 48.
- the annular member 45 and the annular dividing member 46 have the same inclined tapered surface and are in contact with each other.
- the spring 48 is covered with a spring cover 49.
- FIG. 10 shows a state in which the annular member 45, the spring 47, and the spring cover 49 are removed when the support portion 30 is viewed from above.
- FIG. 10 shows a case where the annular dividing member 46 is divided into three parts in one round.
- the holding portion 31 is configured to be fitted with the center pole 34 of the support portion 30, and includes a clamp portion 40 of the optical disc 100, an inner peripheral support portion 50 that holds the flat portion inside the step of the optical disc 100, and a cushion 51.
- the optical disc 100 does not fly during the rotation of the optical disc 100 because the optical disc 100 has an inner hole and allows the center pole 34 in the receiving portion 30 to pass through.
- the height of the step needs to be 1 mm or more and the step angle needs to be 80 deg or more. Also, the higher the step height, the easier it is to stay, but the thickness becomes thinner and the strength cannot be maintained. Therefore, the height of the step is preferably 3 mm or less, and desirably 2 mm or less.
- FIGS. 11A to 11F are sectional views of an optical disc 100 according to a seventh embodiment of the present invention.
- An annular step 110 concentric with the center of the data area 102 is formed in the inner peripheral edge area 101 (clamp area or inside the clamp area) of the optical disc 100.
- FIG. 11 is compared with FIG. 1, in FIG. 11, one annular step 110 is formed at an acute angle with respect to the inside.
- the angle of the step 110 formed at this acute angle is, for example, 50 to 80 degrees with respect to the disk surface.
- the tapered portion 52a (FIG. 12) of the annular member that engages with the step 110 of the optical disk 100 is at an angle of, for example, 40 degrees to 70 degrees with respect to the disk surface.
- FIG. 23 is a cross-sectional view showing details of the shape of the step 110.
- the stage 110 has an acute-angle edge portion 111 used for positioning the center of the optical disk.
- the angle ⁇ on the inner side of the cross section of the acute edge portion 111 is, for example, not less than 50 degrees and not more than 80 degrees.
- the optical disk 100 can be held by one annular member, and the apparatus configuration is simplified. 12 to 17 show an example of a holding device for the optical disc 100 of the present invention.
- FIG. 12 shows the holding unit when the optical disc 100 is in FIG. 11A
- FIG. 13 shows the holding unit when the optical disc 100 is in FIG. 11B
- FIG. 11C shows the optical disc 100.
- 14 shows the holding unit in FIG. 14
- FIG. 15 shows the holding unit when the optical disc 100 is in FIG. 11D
- FIG. 16 shows the holding unit in the case where the optical disc 100 is in FIG.
- FIG. 17 shows the holding unit when the optical disc 100 is shown in FIG.
- the spindle 32, the clamp portion 33, and the center pole 34 are integrally rotated about the rotation shaft 150.
- a concentric annular member (positioning portion) 52 is fitted between the clamp portion 33 and the center pole 34 of the support portion 30, and the annular member 52 is pushed up in the direction of the rotation axis by the spring 53.
- the outer diameter of the center pole 34 is larger than the inner hole of the optical disc 100.
- the holding portion 31 has a hole that fits with the center pole 34 and a clamp portion 40.
- the annular member 52 has a tapered portion 52a inclined with respect to the rotation axis direction.
- the tapered surface 52 a of the annular member 52 faces outward, and has a structure that hits the acute edge portion 111 facing the inner side of the optical disc 100.
- FIG. 14 and FIG. 15 there is a difference in whether the stage of the optical disc 100 has one stage or a groove shape as compared with FIG. 12 and FIG. 13, and the basic structure of the support portion 30 is the same as FIG. FIG. 15 and FIG. 12 are the same.
- the step 110 of the optical disc 100 is convexly formed on the signal surface side.
- the basic structure of the support portion 30 is the same as in FIGS. 16 and 15, and is the same as FIGS. 17 and 14. It is.
- the step angle of the optical disc 100 is, for example, 50 to 80 degrees with respect to the disc surface, and the tapered portion of the annular member that engages with the step portion of the optical disc 100 is, for example, 40 to 70 degrees with respect to the disc surface.
- the step edge of the optical disc 100 and the tapered portion of the annular member are firmly engaged to transmit force, and the center of the data area 102 of the optical disc 100 and the rotation center of the support portion 30 coincide.
- Positioning is performed as follows.
- FIG. 18 and 19 show a holding device 200 for an optical disc 100 according to an eighth embodiment of the present invention.
- 18 shows a holding device for the optical disc 100 in FIG. 11 (e)
- FIG. 19 shows a holding device for the optical disc 100 in FIG. 11 (f).
- a positioning mechanism is formed on the pushing portion 31.
- FIG. 18 and FIG. 14 are the same as the basic configuration for positioning, and FIG. 19 and FIG. 15 are the same.
- a stopper 56 is provided so that the annular member 54 of the push portion 31 does not fly out.
- the stage 110 has the acute angle edge portion 111
- the holding device 200 according to the eighth and ninth embodiments holds the optical disc 100 having the acute angle edge portion 111.
- a method of manufacturing an optical disc having an acute edge portion according to the ninth embodiment of the present invention will be described.
- 20A and 20B show a method for manufacturing the optical disc 100 when the optical disc 100 is shown in FIG.
- FIG. 20 (a) is a diagram showing only the inner peripheral portion of the manufacturing method shown in FIG. 2 in which the mold is opened after the disk substrate 1 is formed into the shape shown in FIG. 1 (a).
- an air blowing port 57 is provided around the side surface of the recessed portion 2 a of the mirror surface board 2.
- FIG. 20B shows a state in which the side surface of the disk substrate 1 is deformed by blowing air from the air blowing port 57 before the disk substrate 1 is cooled and solidified. As a result, the edge of the step on the mirror surface board 2 side of the disk substrate 1 becomes an acute angle.
- the inner circumference positioning 12 includes an inner portion 12a fixed to the mirror surface plate 4 and a movable portion 12b. Further, an air outlet 58 is provided at the tip of the punch 14.
- FIG. 21A the mold is closed.
- the movable portion 12b of the inner peripheral positioning 12 is lowered as shown in FIG. 21B, and the punch 14 is retracted to the position shown in the figure. From the tip, air blows out through the air outlet 58.
- the disk substrate 1 before solidification is deformed as shown in FIG. 21C, and the steps of the disk substrate 1 form an acute angle.
- the step of the disk substrate 1 can be made an acute angle. In this way, a step with an acute angle can be formed even in the groove-like step in FIGS. 11C to 11F.
- optical disc and the optical disc holding device according to one aspect of the present invention are particularly useful in the field of recording and reproducing data.
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Optical Record Carriers And Manufacture Thereof (AREA)
- Manufacturing Optical Record Carriers (AREA)
- Holding Or Fastening Of Disk On Rotational Shaft (AREA)
Abstract
Description
図1(a)から(d)に本発明の実施の形態1にかかる光ディスク100の断面図を示す。
次に本発明の実施の形態2にかかる光ディスク100の製造方法を説明する。
次に、本発明の実施の形態3にかかる光ディスクの製造方法として、ディスク基板1のデータ領域に情報となる信号やトラック等の凹凸が既に形成されている場合の製造方法を説明する。凹凸が形成されているのはディスク基板1の上面とする。図1(a)の光ディスク100を作製する場合には図5に示す金型を用いる。
光ディスク100の製造方法の実施の形態3では図1(a)の光ディスク100を作製するのに上型の中央部にあるパンチブッシュ20を固定した状態の場合について示した。実施の形態4にかかる光ディスク100の製造方法は、図6に示すように上型の部材と下型部材とでディスク基板1のデータ領域より内側で段形成部より外側を保持した後に段を形成する方法である。凹凸が形成されているのはディスク基板1の上面とする。図1(a)の光ディスク100を作製する場合には図6に示す金型を用いる。
次に、本発明の実施の形態5にかかる光ディスク100の保持装置200について図7(a)と(b)を用いて説明する。光ディスク100の形状は図1(b)の形状である。
光ディスク100の保持装置の実施の形態5では光ディスク100の段に対して内側から位置出しをする場合について示した。光ディスク100の保持方法の実施の形態6では光ディスク100の段に対して外側から位置出しをする場合について図9(a)と(b)を用いて説明する。光ディスク100の形状は図1(a)である。
図11(a)から(f)に本発明の実施の形態7にかかる光ディスク100の断面図を示す。
図18と図19に本発明の実施の形態8にかかる光ディスク100の保持装置200を示す。図18は、図11(e)の光ディスク100の保持装置を示し、図19は、図11(f)の光ディスク100の保持装置を示している。これらの場合には位置出し機構が押し部31の方に形成されている。位置出しの基本構成については図18と図14とが同じであり、図19と図15とが同じである。
実施の形態7にかかる光ディスク100では段110が鋭角エッジ部111を有し、実施の形態8および9にかかる保持装置200は、この鋭角エッジ部111を有する光ディスク100を保持した。ここでは、本発明の実施の形態9にかかる鋭角エッジ部を有する光ディスクの製造方法を説明する。
2、4 鏡面盤
2a 凹み部
3 スタンパ
5 スタンパ内周押え
6 スタンパ外周押え
7 ブッシュ
8 ボールベアリング
9 ポール
10 キャビティ
11、15、18、21 吸引通路
12、12a、12b パンチブッシュ
13 吸引溝
14 パンチ
16、19 断熱材
17 受けブッシュ
20 パンチブッシュ
22 突き出しブッシュ
30 支持部
31 押え部
32 スピンドル
33、40 クランプ部
34 センターポール
35、45、52、54 環状部材
36、46 環状分割部材
37、38、39、44、47、48、53、55 バネ
41、51 クッション
42 押し板
43 留め板
49 バネカバー
50 内周支持部
56 ストッパー
57、58 エア吹き出し口
100 光ディスク
101 内周端領域
102 データ領域
110、120 段
110a、110b 段の側面
111 鋭角エッジ部
150 回転軸
200 保持装置
221 記録層
222 反射層
223 保護層
Claims (5)
- 樹脂で形成されたディスク基板を備え、データ領域の厚さが0.2mm以下の情報記録媒体であって、
前記情報記録媒体の内周端領域に高さが1mm以上3mm以下の段をさらに備え、
前記段は、前記情報記録媒体を回転させるときに前記情報記録媒体の中心の位置決めを行うために用いられる鋭角エッジ部を備え、
前記鋭角エッジ部の断面の内部側の角度は50度以上80度以下である、情報記録媒体。 - 前記情報記録媒体は前記段を複数個備え、
前記複数の段の少なくとも1つが前記鋭角エッジ部を備える、請求項1に記載の情報記録媒体。 - 請求項1に記載の情報記録媒体を保持する保持装置であって、
前記情報記録媒体を保持する保持部と、
前記情報記録媒体の中心の位置決めを行う位置決め部と
を備え、
前記位置決め部は、前記段の前記鋭角エッジ部と接することで前記情報記録媒体の中心の位置決めを行う、保持装置。 - 前記位置決め部は、前記情報記録媒体の回転軸方向に沿って移動可能であり、
前記位置決め部は、前記回転軸方向に対して傾斜したテーパ部を有し、
前記段の前記鋭角エッジ部と前記テーパ部とを押し当てることで前記情報記録媒体の中心の位置決めを行う、請求項3に記載の保持装置。 - 樹脂で形成されたディスク基板を備え、データ領域の厚さが0.2mm以下の情報記録媒体であって、
前記情報記録媒体の内周端領域に高さが1mm以上3mm以下の段をさらに備え、
前記段の側面は、前記情報記録媒体を回転させるときに前記情報記録媒体の中心の位置決めを行うために用いられ、
前記データ領域の面方向と前記段の断面の側面方向との間の角度は、80度以上100度以下である、情報記録媒体。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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US13/817,664 US8826311B2 (en) | 2011-05-10 | 2012-05-02 | Information recording medium and holding device for holding information recording medium |
CN201280002210.3A CN103038827A (zh) | 2011-05-10 | 2012-05-02 | 信息记录介质及保持信息记录介质的保持装置 |
JP2013513922A JP5971564B2 (ja) | 2011-05-10 | 2012-05-02 | 情報記録媒体および情報記録媒体を保持する保持装置 |
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JP2011105070 | 2011-05-10 | ||
JP2011-105070 | 2011-05-10 |
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WO2012153503A1 true WO2012153503A1 (ja) | 2012-11-15 |
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PCT/JP2012/002974 WO2012153503A1 (ja) | 2011-05-10 | 2012-05-02 | 情報記録媒体および情報記録媒体を保持する保持装置 |
Country Status (4)
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US (1) | US8826311B2 (ja) |
JP (1) | JP5971564B2 (ja) |
CN (1) | CN103038827A (ja) |
WO (1) | WO2012153503A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9183620B2 (en) | 2013-11-21 | 2015-11-10 | International Business Machines Corporation | Automated tilt and shift optimization |
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JPH09153231A (ja) * | 1995-11-29 | 1997-06-10 | Toshiba Corp | 光ディスク |
JP2002298450A (ja) * | 2001-03-30 | 2002-10-11 | Tdk Corp | スタンパ、金型システム、記録媒体用基板、スタンパ製造方法 |
JP2003006936A (ja) * | 2001-05-14 | 2003-01-10 | Lg Electronics Inc | 非対称上下構造の中央ホールを有する高密度光ディスク及びその製造方法 |
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JP2008090932A (ja) * | 2006-10-02 | 2008-04-17 | Hitachi Maxell Ltd | 情報記録媒体及び、その製造方法 |
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JPS5814336A (ja) | 1981-07-20 | 1983-01-27 | Toshiba Corp | 情報記憶媒体およびその製造方法 |
JPS6453788A (en) | 1987-08-20 | 1989-03-01 | Seidensha Electronics | Laser beam cutting method for digital disk |
TW584848B (en) | 2001-03-30 | 2004-04-21 | Tdk Corp | Moulding die, metallic mould system, recording medium base plate, recording medium, optical disc base plate, optical disc, moulding die making method |
JP3961466B2 (ja) * | 2002-09-05 | 2007-08-22 | 松下電器産業株式会社 | 光情報記録媒体及びその製造方法、並びに光情報記録媒体の保持方法 |
KR100499479B1 (ko) * | 2002-09-10 | 2005-07-05 | 엘지전자 주식회사 | 고밀도 광디스크 구조 |
US7478413B2 (en) * | 2003-08-22 | 2009-01-13 | Hitachi Maxell, Ltd. | Optical recording medium |
JP4278618B2 (ja) * | 2004-03-04 | 2009-06-17 | 富士通テン株式会社 | ディスク状記録媒体のクランプ機構 |
-
2012
- 2012-05-02 US US13/817,664 patent/US8826311B2/en not_active Expired - Fee Related
- 2012-05-02 CN CN201280002210.3A patent/CN103038827A/zh active Pending
- 2012-05-02 WO PCT/JP2012/002974 patent/WO2012153503A1/ja active Application Filing
- 2012-05-02 JP JP2013513922A patent/JP5971564B2/ja not_active Expired - Fee Related
Patent Citations (5)
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JPH09153231A (ja) * | 1995-11-29 | 1997-06-10 | Toshiba Corp | 光ディスク |
JP2002298450A (ja) * | 2001-03-30 | 2002-10-11 | Tdk Corp | スタンパ、金型システム、記録媒体用基板、スタンパ製造方法 |
JP2003006936A (ja) * | 2001-05-14 | 2003-01-10 | Lg Electronics Inc | 非対称上下構造の中央ホールを有する高密度光ディスク及びその製造方法 |
JP2006134436A (ja) * | 2004-11-04 | 2006-05-25 | Funai Electric Co Ltd | 光ディスクおよび光ディスクの製造方法 |
JP2008090932A (ja) * | 2006-10-02 | 2008-04-17 | Hitachi Maxell Ltd | 情報記録媒体及び、その製造方法 |
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US9183620B2 (en) | 2013-11-21 | 2015-11-10 | International Business Machines Corporation | Automated tilt and shift optimization |
Also Published As
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US8826311B2 (en) | 2014-09-02 |
JP5971564B2 (ja) | 2016-08-17 |
US20130247075A1 (en) | 2013-09-19 |
JPWO2012153503A1 (ja) | 2014-07-31 |
CN103038827A (zh) | 2013-04-10 |
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