JP2006179159A - Spacer for forming image on label surface of optical disk and image forming method on label surface of optical disk - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the center of the rotation of an optical disk from being shifted from the center of the rotation of a turntable at the time of forming an image on an image forming layer by setting the optical disk on the turntable across a spacer while making the label surface side of the disk face an optical pickup, and by driving the rotation of the turntable, and by irradiating the image forming layer formed on the label surface of the disk with a laser beam to change the visible light characteristics of the image forming layer. <P>SOLUTION: Recessed structure or projected structure which is to be fitted to the recessed structure or the projected structure which is formed on the label surface of the disk is formed on a surface facing the disk of the spacer. Alternatively, a surface facing the disk of the space is constituted to be a adhesive surface by applying an transparent adhesive on the surface facing the disk, and the spacer is laminated on the disk while aligning the center axis of the spacer with that of the disk. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a spacer used to form an image such as a picture or a character by irradiating a laser beam emitted from an optical pickup onto a label surface of an optical disc, and an image forming method using the spacer. This is to prevent the rotation center of the optical disc from being shifted when an image is formed.

  An image forming layer made of a photosensitive material, a heat-sensitive material, etc. is formed on the label surface of the optical disc, and the optical disc is turned over (that is, the label surface side faces the optical pickup) and set on a turntable, and is driven to rotate. Conventionally, a method for irradiating an image forming layer with laser light emitted from a pickup and changing the visible light characteristics of the image forming layer to form an image on a label surface has been proposed. For example, in Patent Document 1, as shown in FIG. 2, the optical disk 10 is turned over (that is, the label surface 10 b side is faced to the optical pickup 12), and the turn fixed to the rotating shaft end of the spindle motor 14. An image forming layer formed on the label surface 10 b is set on the table 16, the optical disk 10 is clamped by the disk clamper 17, the spindle motor 14 is rotationally driven, and the laser light 20 emitted from the objective lens 18 of the optical pickup 12 is formed. A method for forming an image on the image forming layer 19 by irradiating the image forming layer 19 is disclosed.

  Further, in Patent Document 2, as shown in FIG. 3, a spacer 22 having the same thickness as that of the optical disk 10 is mounted on the label surface 10b side of the central clamp portion of the optical disk 10, the optical disk 10 is turned over, and the spindle motor 14 The optical disk 10 is clamped by the disk clamper 17 and the spindle motor 14 is driven to rotate, and the laser light 20 emitted from the objective lens 18 of the optical pickup 12 is set. A method of irradiating the image forming layer 19 formed on the label surface 10b to form an image on the image forming layer 19 is disclosed.

Japanese Patent Laid-Open No. 2002-203321 JP 2003-203348 A

  FIG. 4A shows an optical disk 10 and an objective when data recording or data reproduction is performed on the optical disk 10 (here, a CD-R / RW disk is shown) in the optical disk recording apparatus of FIGS. The positional relationship of the lens 18 is shown. The objective lens 18 faces the optical disc 10 with a space 24 corresponding to a predetermined working distance WD (a distance between the objective lens 18 and the facing surface of the optical disc 10 determined for each optical pickup). The optical disk 10 has a data recording layer 28, a reflective layer (not shown), and an image forming layer 19 on the back surface (the surface on the label surface 10 b side) of the substrate 26 having a predetermined thickness (1.2 mm for a CD-R disc). The protective layer (not shown) is sequentially laminated. When recording data on the optical disk 10 or reproducing data from the optical disk 10, the surface 10a (the surface opposite to the label surface 10b, that is, the surface of the substrate 26) of the disk 10 faces the objective lens 18. In this state, the laser beam 20 emitted from the objective lens 18 is incident from the front surface 10a of the optical disc 10 through the space 24 corresponding to the working distance WD, passes through the substrate 26, and is formed on the back surface of the substrate 26. The data recording layer 28 is focused, and recording is performed on the data recording layer 28, or information recorded on the data recording layer 28 is read.

  FIG. 4B shows a state when image formation is performed on the label surface 10b by the method of FIG. At this time, the position at which the laser beam 20 should be focused (that is, the position of the image forming layer 19) is optical in the air corresponding to the thickness of the substrate 26 as compared with the time of data recording or reproduction in FIG. Since the distance d (the thickness of the substrate 26 / the refractive index of the substrate 26) is decreased, the objective lens 18 adds the working distance WD and the optical distance d to the opposite surface (label surface 10b) of the optical disc 10. It was necessary to move downward by a distance (that is, an extra optical distance d). For this reason, when the surface shake of the optical disk 10 is large, it is necessary to move the objective lens 18 to a lower position. When the ability of focus control is low, the focus control becomes impossible, and a desired image is obtained. In some cases, it could not be formed.

  FIG. 4C shows a state when image formation is performed on the label surface 10b by the method of FIG. At this time, since the optical disk 10 is disposed above the thickness of the spacer 22 as compared with the case of FIG. 4B, the objective lens 18 does not need to be lowered further, and the surface wobbling of the optical disk 10 is correspondingly reduced. The follow-up range of focus control with respect to is expanded. However, in this method, as shown in FIG. 5, the optical disk 10 is not properly positioned on the turntable 16, and is rotated while the center of the optical disk 10 is displaced from the rotation center of the turntable 16 and the disk is clamped. In some cases, image formation could not be performed correctly.

  The present invention has been made in view of the above-described points, and an object of the present invention is to prevent a rotation center shift of an optical disc when an image is formed on a disc label surface using a spacer.

  The optical disc label surface image forming spacer according to the present invention sets an optical disc on a turntable with its label surface facing the optical pickup, and rotates to drive the laser beam emitted from the optical pickup to the label of the optical disc. When the image forming layer formed on the surface is irradiated and the visible light characteristics of the image forming layer are changed to form an image on the image forming layer, the image forming layer is used by being sandwiched between the turntable and the optical disc. A jig having a close contact structure for fixing the optical disk to itself. According to this, due to the close contact structure, the optical disc and the spacer are prevented from being misaligned, and the rotational center of the optical disc can be prevented from being displaced.

  For example, when the convex structure is formed on the label surface of the optical disc in a state where the central axes of the optical disc and the spacer are aligned, the close-contact structure is a concave structure that fits at least one of the convex structures. Alternatively, in the case where a concave structure is formed on the label surface of the optical disc, it can be configured to have at least one convex structure that fits into at least one of the concave structures. According to this, the centering of the spacer is facilitated by the fitting of the concavo-convex structure, the misalignment between the optical disk and the spacer is prevented, and the center of rotation of the optical disk can be prevented.

  The contact structure can also be configured as an adhesive surface in which an adhesive is applied to the surface of the spacer facing the optical disc so that the spacer is detachably bonded to the optical disc. . According to this, since the spacer and the optical disk are adhered and fixed and integrated, if the spacer and the optical disk are adhered with the center aligned, the misalignment between the spacer and the optical disk can be prevented, and the rotation center deviation of the optical disk can be prevented. Can be prevented.

  The contact structure further includes a concave structure that fits at least one of the convex structures when a convex structure is formed on the label surface of the optical disk in a state where the central axes of the optical disk and the spacer are aligned. Or, when a concave structure is formed on the label surface of the optical disc, the optical disc has at least one convex structure that fits into at least one of the concave structures, and the spacer is detachable from the optical disc. The spacer may have a pressure-sensitive adhesive surface coated with a pressure-sensitive adhesive on the surface facing the optical disc so that they are bonded together. According to this, the centering of the spacer is facilitated by the fitting of the concavo-convex structure, and the concavo-convex structure and the adhesive prevent the misalignment between the optical disk and the spacer, thereby preventing the rotation center deviation of the optical disk. Can do.

  Also, the optical disk label surface image forming spacer of the present invention is a track in which information detectable by the optical pickup is recorded in an area corresponding to an area on the inner circumference side of the area on which the image is to be formed on the optical disk. Can be formed. In this way, it is possible to detect whether the spacer is loaded in the optical disc recording apparatus.

  The optical disk label surface image forming method of the present invention forms an image on the optical disk label surface using the optical disk label surface image forming spacer of the present invention.

(Embodiment 1)
An embodiment of the spacer of the present invention will be described. FIG. 1A shows the structure of the optical disk 10 viewed from the label surface 10b side, and FIG. 1B shows the spacer 30 applied to the optical disk 10 viewed from the side of the optical disk 10 facing the label surface 10b. The structure is shown. In FIG. 1A, an optical disk 10 is composed of a recordable optical disk such as a CD standard disk such as CD-R or CD-RW, a DVD standard disk such as DVD-R, DVD-RAM, DVD + RW, or DVD-RW. Has been. In the optical disc 10, the substrate 26 is made of polycarbonate or the like, and in the case of a CD standard disc and a DVD standard disc, the diameter is 12 cm and the thickness is 1.2 mm. A central hole 32 is formed in the center of the optical disc 10. A portion immediately on the outer peripheral side of the center hole 32 constitutes a clamp area 34 for fixing the disk. At the outermost peripheral position of the clamp area 34, a stack ring 36 having a predetermined width made of a concave stripe (reverse relief structure) or a convex stripe (relief structure) having a ring center coinciding with the center of the optical disk 10 is formed in an annular shape. Has been. An image forming layer 19 made of a photosensitive material, a heat-sensitive material, or the like is formed on the entire area of the label surface 10b between the position immediately outside the stack ring 36 and the position immediately before the outermost peripheral edge 10c of the disk. The entire image forming layer 19 constitutes an image forming area 38.

  In FIG. 1B, the entire spacer 30 is made of the same material (polycarbonate or the like) as the substrate 26 of the optical disk 10 in a disc shape and transparently. The spacer 30 has an outer diameter that is equal to or larger than the diameter of the outer peripheral edge of the image forming area 38 of the optical disc 10 and is configured to be substantially the same as the diameter of the optical disc 10 (12 cm or the like) and covers the entire image forming area 38. It is configured. The outer peripheral edge portion of the spacer 30 can be configured to have a flat chamfered shape 30a, a convex rounded shape 30b, or the like. A central hole 40 is formed in the center of the spacer 30. A portion immediately on the outer peripheral side of the center hole 40 constitutes a clamp area 44. At the outermost peripheral position of the clamp area 44, a ring portion comprising a ridge (relief structure) or a groove (reverse relief structure) fitted to the stack ring 36 of the optical disk 10 with the ring center coincident with the center of the spacer 30. 42 is configured. A surface of the spacer 30 facing the optical disk 10 is configured by forming a thin film of transparent adhesive on the entire area facing the image forming area 38 of the optical disk 10 to form an adhesive surface 43 (adhesive layer). The entire spacer 30 excluding the ring portion 42 (that is, the region of the spacer 30 facing the image forming region 38 of the optical disc 10 and the region sandwiched between the turntable and the optical disc 10) is the substrate 26 of the optical disc 10. And the same thickness T (1.2 mm, etc.).

  FIG. 6 shows an enlarged cross-sectional structure when the optical disc 10 is a CD-R disc. However, the film thickness of the laminated film is exaggerated. This optical disk 10 is constructed by integrally forming a dye layer (data recording layer) 28, a reflective layer 31, an image forming layer 19, and a protective layer 46 on one surface of a transparent substrate 26 such as polycarbonate, and integrally forming the whole. is there. Except for the presence of the image forming layer 19, it is the same as a normal CD-R disc. From the label surface 10 b side, the image forming layer 19 can be desired through the transparent protective layer 46. When the image forming layer 19 is irradiated with laser light having a predetermined power or higher from the label surface 10b side, visible light characteristics {color (hue, lightness, saturation), spectrum from the label surface 10b side of the irradiated portion are measured. , Reflectance, transmittance, light scattering, etc., for example, the color of the photosensitive material or heat sensitive material changes {for example, from white to colored (black, etc.), from transparent to colored (black, etc.), etc. Varying} material layer (color changing layer by photosensitive layer, heat sensitive layer, etc.). By constituting the image forming layer 19 with a transparent or translucent material, the laser beam can be focused on the image forming layer 19 at the time of drawing. In addition, by forming a large number of microscopic holes leading to the surface of the reflective layer 31 over the entire surface of the image forming layer 19 so that the surface of the reflective layer 31 can be seen, the focus of the laser beam on the image forming layer 19 at the time of drawing. Can be tied. Furthermore, the image forming layer 19 can be made of a material having a high reflectance, and the laser beam can be focused on the image forming layer 19 at the time of drawing. During data recording or reproduction on the data recording layer 28 of the optical disc 10, the laser light is incident from the substrate 26 side and is almost blocked by the reflective layer 31, so that no change occurs in the image forming layer 19.

  FIG. 7 shows a cross-sectional structure of the optical disc 10 and the spacer 30 cut along a plane passing through their central axes when the optical disc 10 is a CD standard disc (only the left part from the central axis is shown). (A) shows a state in which the optical disk 10 and the spacer 30 are separated, and (b) shows a state in which the optical disk 10 and the spacer 30 are overlapped in order to form an image on the label surface 10b of the optical disk 10. In the overlapped state of (b), the optical disc 10 and the spacer 30 overlap each other concentrically with the concave stack ring 36 and the convex ring portion 42 of the spacer 30 fitted together. At this time, the optical disk 10 and the spacer 30 are detachably bonded and integrated by an adhesive surface 43 formed of a transparent adhesive layer formed in a thin film on the surface of the spacer 30. By fitting the stack ring 36 of the optical disc 10 and the ring portion 42 of the spacer 30, the centering of the optical disc 10 and the spacer 30 is facilitated, the misalignment between the optical disc 10 and the spacer 30 is prevented, and the rotation center of the optical disc 10 is rotated. Misalignment is prevented.

  FIG. 8 shows a state where an image is formed on the label surface 10 b of the optical disk 10. The optical disk 10 and the spacer 30 are overlapped and bonded as shown in FIG. 7B, and this bonded body 50 is placed on the optical pickup 12 side and the turntable is placed in the communicating center holes 40 and 32. The 16 central convex portions 16a are inserted and placed on the receiving portion 16b of the turntable 16, and further the disk clamper 17 is pressed and clamped from above. At this time, the central axes of the optical disk 10 and the spacer 30 coincide with the rotation axis of the turntable 16. The bonded body 50 is rotationally driven by the spindle motor 14, the laser beam 20 is emitted from the objective lens 18 of the optical pickup 12, and the image forming layer 19 of the optical disk 10 is focused by focus control, and an image such as a picture or a character is displayed. Draw. After the drawing is finished, the bonded body 50 is removed from the turntable 16, the optical disk 10 and the spacer 30 are peeled off, and the optical disk 30 is used in the same manner as a normal optical disk.

  FIG. 9 shows the positional relationship between the optical disk 10 and the objective lens 18 when image formation is performed as shown in FIG. At this time, since the optical disk 10 is disposed above the thickness of the spacer 30 as compared with the case of FIG. 4B, the objective lens 18 does not have to be lowered, and the focus control for the surface shake of the optical disk 10 can be performed. The tracking range is expanded. Further, since the laser beam 20 passes through the spacer 30 made of the same material as the substrate 26 of the optical disc 10 and focuses on the image forming layer 19, the image is transmitted only through the space as shown in FIG. As compared with the case where the formation layer 19 is focused, the occurrence of spherical aberration is suppressed, and the laser light 20 can be converged to a minute spot by the image formation layer 19. That is, the optical system of the optical pickup 12 is designed on the assumption that the laser beam 20 is transmitted through the substrate 26 to perform data recording. Therefore, as shown in FIG. If the image forming layer 19 is focused without being transmitted and image formation is performed, spherical aberration occurs, and the laser light 20 cannot be converged to a minute spot by the image forming layer 19. For this reason, the energy density of the beam spot cannot be sufficiently obtained in the image forming layer 19, and it is difficult to realize dark color drawing, high resolution drawing, high speed drawing and the like. On the other hand, if the laser beam 20 is transmitted through the spacer 30 and focused on the image forming layer 19 as shown in FIG. 8, the occurrence of spherical aberration is suppressed. Enough energy density can be obtained, and dark color drawing, high resolution drawing, high speed drawing, etc. can be realized.

(Embodiment 2)
FIG. 10 shows a cross-sectional structure of the optical disc 10 and the spacer 30 cut along a plane passing through their central axes when the optical disc 10 is a DVD standard disc (only the left part from the central axis is shown). The entire spacer 30 is made of the same material (polycarbonate or the like) as that of the substrate 26 of the optical disk 10 in a disc shape and transparently. (A) shows a state in which the optical disk 10 and the spacer 30 are separated, and (b) shows a state in which the optical disk 10 and the spacer 30 are overlapped in order to form an image on the label surface 10b of the optical disk 10. In the overlapped state of (b), the optical disc 10 and the spacer 30 overlap each other concentrically with the convex stack ring 36 and the concave ring portion 42 of the spacer 30 fitted together. At this time, the optical disk 10 and the spacer 30 are detachably bonded and integrated by an adhesive surface 43 formed of a transparent adhesive layer applied to the surface of the spacer 30.

  The DVD disk 10 has a structure in which two 0.6 mm-thick substrates 26 are bonded together, and a data recording layer 28 is disposed on the bonded surface. This DVD disk 10 is a type of DVD disk that performs data recording and data reproduction by applying laser light only from the surface 10a (the surface opposite to the label surface 10b). At the time of data recording, the laser beam incident from the surface 10a side is transmitted through the substrate 26 on one side having a thickness of 0.6 mm and focused on the data recording layer 28. Therefore, if an attempt is made to perform image formation on the image forming layer 19 by turning over the label surface 10b without using the spacer 30, the position of the image forming layer 19 at that time is the position of the data recording layer 28 when performing data recording. Compared to the height of 0.6mm. Therefore, the thickness of the spacer 30 is set to a thickness (a thickness that is half the thickness T of the DVD disk 10) that is lowered below, that is, 0.6 mm.

  In each of the above embodiments, the spacer is made of the same material as the substrate of the optical disk. However, the spacer may be made of another transparent material having substantially the same refractive index as that of the substrate of the optical disk. Alternatively, if the spacer is made of a transparent material having a higher refractive index than that of the optical disk substrate, the spacer can be set to the same optical distance as compared with the case where the spacer is made of a material having the same refractive index as the optical disk substrate. Thinly formed. When the spacer is formed thin, the mass of the spacer is reduced, and the load on the spindle motor can be reduced. Further, when the mass is reduced, the load such as surface runout is reduced. In each of the above embodiments, the entire spacer is made of the same material, but the clamp area of the spacer can be made of a material different from the area facing the label surface image forming area (for example, an opaque material).

(Embodiment 3)
Another embodiment of the spacer is shown in FIG. This is an improvement over the conventional spacer shown in FIG. The optical disk 10 is a CD standard disk. The spacer 30 is formed with a convex ring portion 42 that fits into the concave stack ring 36 of the optical disk 10. FIG. 11 shows a cross-sectional structure of the optical disc 10 and the spacer 30 cut along a plane passing through their central axes (only the left part is shown from the central axis). (A) shows a state in which the optical disk 10 and the spacer 30 are separated, and (b) shows a state in which the optical disk 10 and the spacer 30 are overlapped in order to form an image on the label surface 10b of the optical disk 10. The outer diameter of the spacer 30 is set to a size (about 3 cm in diameter) that does not cover the image forming layer 19 on the optical disc label surface 10b. At the time of image formation, the laser beam is focused on the image forming layer 19 without being transmitted through the spacer 30, so the thickness of the spacer 30 is “the thickness (T) of the substrate 26 of the optical disk 10 / the refractive index of the substrate 26”. Set to. 11B, the optical disk 10 and the spacer 30 overlap each other concentrically with the stack ring 36 and the ring portion 42 of the spacer 30 fitted together. At this time, the optical disk 10 and the spacer 30 are detachably bonded and integrated by the adhesive surface 43 formed of a transparent or opaque adhesive layer applied to the surface of the spacer 30.

(Embodiment 4)
Yet another embodiment of the spacer is shown in FIG. This is an improvement over the conventional spacer shown in FIG. The optical disk 10 is a DVD standard disk. The spacer 30 is formed with a concave ring portion 42 that fits into the convex stack ring 36 of the optical disk 10. FIG. 12 shows a cross-sectional structure of the optical disc 10 and the spacer 30 cut along a plane passing through their central axes (only the left part is shown from the central axis). (A) shows a state in which the optical disk 10 and the spacer 30 are separated, and (b) shows a state in which the optical disk 10 and the spacer 30 are overlapped in order to form an image on the label surface 10b of the optical disk 10. The outer diameter of the spacer 30 is set to a size (about 3 cm in diameter) that does not cover the image forming layer 19 on the optical disc label surface 10b. At the time of image formation, the laser beam is focused on the image forming layer 19 without passing through the spacer 30, so that the thickness of the spacer 30 is “the thickness of one substrate 26 of the optical disk 10 (T / 2) / the same substrate 26. To "refractive index of". 12B, the optical disk 10 and the spacer 30 overlap each other concentrically with the stack ring 36 and the ring portion 42 of the spacer 30 fitted together. At this time, the optical disk 10 and the spacer 30 are detachably bonded and integrated by the adhesive surface 43 formed of a transparent or opaque adhesive layer applied to the surface of the spacer 30.

(Embodiment 5)
Yet another embodiment of the spacer is shown in FIG. The spacer 52 is formed by forming a track 74 in which information detectable by an optical pickup is recorded in an area corresponding to an area on the inner circumference side of an area on which an image is to be formed on an optical disk. First, FIG. 14 shows a cross-sectional structure of an optical disc to which the spacer 52 is applied and an area division layout of a data recording area (area where data can be recorded on the data recording layer). This optical disk 54 is configured as a CD-R disk. The optical disk 54 has a substrate 56 made of polycarbonate, a diameter of 12 cm, and a thickness of 1.2 mm. A central hole 58 is formed at the center of the optical disk 54. A portion immediately on the outer peripheral side of the center hole 58 of the optical disc 54 constitutes a clamp area 60 for fixing the disc. On the front surface 54a side of the optical disc 54, a stack ring 62 having a predetermined width made of a convex line (relief structure) having a ring center coinciding with the center of the optical disc 54 is formed in an annular shape at the outermost peripheral position of the clamp area 60. Has been. On the label surface 54 b side of the optical disk 54, the inner surface 54 a is slightly inward from the stack ring 62 on the surface 54 a side, and has a groove (reverse relief structure) having a ring center coinciding with the center of the optical disk 54. A stack ring 64 having a predetermined width is formed in an annular shape.

  The laminated structure of the film in the data recording area 66 of the optical disc 54 (the laminated structure of the B part in FIG. 14) is the same as that schematically shown in FIG. The data recording area 66 is divided from the inner periphery side into a PCA area 66A, a PMA area 66B, a lead-in area 66C, a program area 66D, and a lead-out area 66E. The boundary position between the program area 66D and the lead-out area 66E varies depending on the amount of data recorded in the program area 66D. In the example of FIG. 14, the image forming layer 19 is formed in an area covering the lead-in area 66C to the lead-out area 66E in the entire data recording area 66.

  The spacer 52 in FIG. 13 will be described. In the spacer 52, a substrate (spacer substrate) 68 is made of the same polycarbonate or other type of transparent plastic material as the substrate 56 of the optical disk 54, and is configured integrally and transparently. The spacer substrate 68 has a predetermined thickness and is formed in a disk shape having the same diameter as the optical disk 54. On the upper surface 68a of the spacer substrate 68 (the surface facing the optical disc 54), a convex ring portion 70 that fits into the concave stack ring 64 of the optical disc 54 is formed in an annular shape. The upper surface 68a of the spacer substrate 68 is formed on a flat surface except for a portion where the ring portion 70 is formed. On the upper surface 68a of the spacer substrate 68, a transparent adhesive is thinly applied in the form of a film over the entire region on the outer peripheral side of the ring portion 70 to form an adhesive surface 71 (adhesive layer). The entire lower surface 68b of the spacer substrate 68 is formed as a flat surface. At the position on the center axis L of the spacer substrate 68, the center has the same inner diameter as the center hole 58 of the optical disk 54, and forms a circular hole continuous with the center hole 58 of the optical disk 54 when the optical disk 54 is mounted. A hole 72 is formed. The thickness L1 of the spacer substrate 68 is set to satisfy n1 × L2 = n2 × L1, where n1 is the refractive index, n2 is the refractive index of the substrate 56 of the optical disk 54 to be mounted, and L2 is the thickness thereof. ing. Therefore, when the spacer substrate 68 is made of the same material as the substrate 56 of the optical disk 54, the thickness L1 of the spacer substrate 68 is set equal to the thickness L2 of the substrate 56 of the optical disk 54.

  A track 74 is formed in an annular shape at a position around the center hole 72 on the upper surface 68a of the spacer substrate 68 at a position facing the lead-in area 66C (FIG. 14) of the optical disk 54. FIG. 15 schematically shows an enlarged view of the vicinity of the track 74 of the spacer 52. The track 74 is constituted by a pit or wobble (meandering) track formed in a concave or convex shape on the upper surface 68 a of the spacer substrate 68. The track pitch (interval between adjacent tracks 74) is equal to the track pitch of the data recording area 66 of the optical disc 54. The pit or wobble track constituting the track 74 includes information that can be detected and analyzed by an optical pickup. When the track 74 is composed of pits, this information is composed of an EFM signal in a format recorded in the lead-in area 66C of the optical disk 54, and information that can identify a spacer in this EFM signal is, for example, subcode Record using undefined code. When the track 74 is composed of a wobble track, this information is composed of an ATIP signal in a format recorded in the lead-in area 66C of the optical disk 54, and information that can identify a spacer in the ATIP signal is, for example, Record using undefined code of ATIP signal. A metal reflective film 76 is coated on the track 74, and a transparent protective film 78 is further coated thereon. On the protective film 78, the aforementioned adhesive surface 71 (adhesive layer) is formed.

  Next, an embodiment of an optical disk recording apparatus capable of recording and reproducing data with respect to the data recording layer 28 (FIG. 6) of the optical disk 54 and forming an image on the image forming layer 19 of the optical disk 54 using the spacer 52 will be described. Is shown in FIG. FIG. 16 shows a state during image formation. At this time, the optical disk 54 is overlaid on the spacer 52 with the label surface 54b side down. In this state, the optical disc 54 and the spacer 52 are concentrically overlapped with each other by fitting the concave stack ring 64 of the optical disc 54 and the convex ring portion 70 of the spacer 52 together. At this time, the optical disk 54 and the spacer 52 are detachably bonded and integrated by an adhesive surface 71 formed of a transparent adhesive layer formed in a thin film shape on the surface of the spacer 52. By fitting the stack ring 64 of the optical disk 54 and the ring portion 70 of the spacer 52, the centering of the optical disk 54 and the spacer 52 is facilitated, the misalignment between the optical disk 54 and the spacer 52 is prevented, and the center of rotation of the optical disk 54 is prevented. Misalignment is prevented.

  In the combined body 80 thus integrated, the spacer 52 is arranged on the optical pickup 12 side, the central convex portion 16a of the turntable 16 is inserted into the communicating central holes 72 and 58, and the turntable 16 The disc clamper 17 is pressed from above and clamped on the receiving portion 16b. At this time, the central axis L of the optical disk 54 and the spacer 52 coincides with the rotation axis of the turntable 16. In this state, the spindle motor 14 rotates the combination 80, emits laser light 20 from the objective lens 18 of the optical pickup 12, and focuses on the image forming layer 19 of the optical disk 54 by focus control to draw pictures and characters. It is possible to draw an image such as

  When recording or reproducing data on the data recording layer 28 of the optical disk 54, the central convex portion 16a of the turntable 16 is inserted into the center hole 58 of the optical disk 54 alone with the data recording surface 54a side down, and the turntable The disk clamper 17 is pressed from above and clamped. At this time, the central axis of the optical disk 54 coincides with the rotation axis of the turntable 16. In this state, the optical disk 54 is rotationally driven by the spindle motor 14, the laser light 20 is emitted from the objective lens 18 of the optical pickup 12, and the data recording layer 28 of the optical disk 54 is focused by focus control to record data or Playback can be performed.

  In FIG. 16, the recording signal generating means 82 generates a recording signal to be recorded on the data recording layer 28 of the optical disc 54 based on the recording data supplied from an external storage device or the like. The image signal generation unit 84 generates an image signal to be drawn on the image forming layer 19 of the optical disc 54 based on image data supplied from an external storage device or the like. The switching means 86 switches between recording data and image data and outputs them. The information analysis unit 88 analyzes information detected by the optical pickup 12. The data reproduction means 90 outputs the information analyzed by the information analysis means 88 to the outside when reproducing data from the optical disk 54. When the operation of loading the optical disc into the optical disc recording apparatus is executed, the control means 92 tries to read the area corresponding to the lead-in area 66C of the optical disc 54, and various kinds of information are obtained according to the analysis result by the information analysis means 88. Control.

  The control contents of the control means 92 are shown in a flowchart in FIG. When the completion of the disk loading operation is detected (S1), the optical pickup 12 is moved to an area corresponding to the lead-in area 66C of the optical disk 54 (S2). When this movement is completed, the objective lens 18 is forcibly reciprocated in the vertical direction to perform a focus search (S3), and it is determined whether the S curve of the focus error signal is obtained within a predetermined time or within a predetermined number of reciprocations. (S4). As a result, if the S curve cannot be obtained, it is determined that an error has occurred (S5), the focus search is terminated, the optical pickup 12 is returned to the initial position, the disc ejection operation is performed, and the control is terminated.

  On the other hand, when the S curve is obtained and the focus lock state is drawn, the tracking servo is turned on as it is (S6), and it is determined whether or not the track has been successfully captured within a predetermined time (S7). As a result, if the track could not be captured within the predetermined time, it is determined as an error (S8), the tracking servo and the focus servo are turned off, the optical pickup 12 is returned to the initial position, the disc ejection operation is performed, and the control is performed. Terminate. On the other hand, when the track is successfully captured, the information analysis means 88 decodes the EFM signal and the ATIP signal from the detection signal in the area corresponding to the lead-in area 66C of the optical disk 54 by the optical pickup 12 (S9).

  The control means 92 includes information for identifying whether the decoded information is information of the lead-in area 66C of the optical disc 54 or the information of the track 74 of the spacer 52 (that is, the spacer 52). (S10). When the control unit 92 determines that the decoded information is the information in the lead-in area 66C of the optical disc 54, the optical disc 54 alone is placed on the data recording surface 54a side as shown in FIG. The optical disc recording apparatus is set to a state where data can be recorded or reproduced on the data recording layer 28, for example, by switching the switching means 86 to the recording signal generating means 82 side. S11).

  On the other hand, if the decoded information includes information that can identify the spacer 52, the control unit 92 moves the optical pickup 12 to the program area of the optical disc 54 with the focus servo turned on (S12). ). The control means 92 determines whether the focus lock state is maintained or released as a result of this movement (S13). That is, when the optical disk 54 is correctly attached to the spacer 52 as shown in FIG. 18B, the metal reflective film 76 (FIG. 15) formed on the track 74 of the spacer 52 and the optical disk 54 Since the reflection layer 31 (FIG. 6) in the data recording area 66 is at a close height, the focus is when the focus of the laser beam 20 is deviated from the outermost peripheral position of the track 74 of the spacer 52 by the movement of the optical pickup 12. Even if the servo is disturbed for a moment, the focus lock state is not released, and the focus can be immediately refocused on the reflective layer 31 of the data recording area 66 of the optical disc 54, so that the focus lock state is maintained. Therefore, when the focus lock state is maintained, the control unit 92 determines that the optical disk 54 is correctly mounted on the spacer 52 as shown in FIG. 18B, and causes the switching unit 86 to generate an image signal. The optical disk recording apparatus is set to a state where drawing on the image forming layer 19 can be performed, such as switching to the means 84 side (S14). In this state, drawing can be performed by irradiating the image forming layer 19 of the optical disc 54 with the laser beam 20 through the spacer 52.

  At the time of drawing, the tracking servo is turned off, the spindle motor 14 is controlled at a constant rotational speed, the optical pickup 12 is fed to the outer periphery at a constant minute speed, and a high-power laser for drawing from the optical pickup 12 is controlled. Drawing can be performed by emitting light 20. As described above, the thickness L1 of the spacer substrate 68 of the spacer 52 is n1, the refractive index of the substrate 56 of the optical disk 54 to be mounted is n2, and the distance from the data recording surface 54a to the reflective film. Is set so as to satisfy n1 × L2 = n2 × L1, where the working distance WD at the time of drawing on the image forming layer 19 (FIG. 18B) is the data for the data recording layer 28. This is equivalent to the working distance WD at the time of recording or reproducing (FIG. 18A).

  On the other hand, when the focus lock state is released as a result of the movement, as shown in FIG. 18 (c), the control means 92 has mounted the spacer 52 without mounting the optical disk 54, or FIG. As shown in d), it is determined that the optical disk 54 has been loaded by being attached to the spacer 52 with the label surface 54b side up, and it is determined that there is an error (S15). End.

  As described above, according to the optical disk recording apparatus of FIG. 16, whether or not the spacer 52 is loaded, whether or not the optical disk 54 is correctly set on the spacer 52 and whether or not the optical disk 54 is loaded correctly is loaded. It is detected whether or not it is loaded, and data is recorded and reproduced with respect to the data recording layer 28 of the optical disc 54, and the spacer 52 is used in the entire area of the image forming layer 19 of the optical disc 54 using the spacer 52. An area corresponding to an area on the outer peripheral side of the track 74, that is, an area on the outer peripheral side of the lead-in area 66C of the optical disc 54 (in this case, this area corresponds to an "area where image formation is to be performed"). ) Can be formed.

  In the description of the fifth embodiment, the track 74 formed on the spacer 52 is formed in the region facing the lead-in region 66C of the optical disk 54, but the entire region facing the PCA region 66A to the lead-in region 66C. A track 74 can also be formed.

  In the description of the fifth embodiment, the track 74 is formed on the surface (upper surface 68a) of the spacer 52 facing the optical disk 54. However, the objective lens 18 of the optical pickup 12 can be moved sufficiently downward. If so, the track 74 can be formed on the opposite surface (lower surface 68b). In the description of the fifth embodiment, the spacer 52 is configured to cover the area on the optical disk 54 where image formation is performed. However, the spacer 52 is configured to have a small diameter that does not cover the area where image formation is performed. You can also track. Further, in the description of the fifth embodiment, the case where the present invention is applied to an optical disk conforming to the CD standard has been described. In the description of the fifth embodiment, information that can identify the spacer is recorded on the track of the spacer 52, but other useful information (for example, an application program) can be recorded.

  In each of the above embodiments, the concavo-convex structure and the adhesive surface are provided on the spacer, but only one of them can be provided.

FIG. 1A is a plan view showing the structure of the optical disk as viewed from the label surface side, and FIG. 1B shows the structure of the spacer applied to the optical disk as viewed from the surface facing the label surface of the optical disk. It is a top view. It is a side view which shows the conventional image forming method. It is a side view which shows another conventional image forming method. 4A is a side view showing the positional relationship between the optical disk and the objective lens when performing data recording or data reproduction on the optical disk in the optical disk recording apparatus of FIGS. 2 and 3, and FIG. FIG. 4C is a side view showing the positional relationship between the optical disk and the objective lens when the image is formed on the label surface by the method 2, and FIG. 4C is a view showing the optical disk and the objective when the image is formed on the label surface by the method of FIG. It is a side view which shows the positional relationship of a lens. It is a figure which shows the rotation center shift | offset | difference of an optical disk which arises with the method of FIG. It is a schematic diagram of a cross-sectional structure when the optical disc is a CD-R disc. It is sectional drawing cut | disconnected by the plane which passes along those center axes of an optical disk and a spacer in case an optical disk is a CD specification disk (only the part of the left side from a center axis is shown). It is a side view which shows the state which forms an image on the label surface of an optical disk. FIG. 9 is a side view showing a positional relationship between an optical disk and an objective lens when image formation is performed as shown in FIG. 8. It is sectional drawing cut | disconnected by the plane which passes along those center axes of an optical disk and a spacer in case an optical disk is a DVD specification disk (only the part of the left side from a center axis is shown). It is a figure which shows other embodiment of a spacer, It is sectional drawing cut | disconnected by the plane which passes along those central axes of an optical disk and a spacer in case an optical disk is a CD specification disk (only the part of the left side is shown from a central axis) .) FIG. 10 is a view showing still another embodiment of the spacer, and is a cross-sectional view of the optical disc and the spacer cut along a plane passing through their central axes when the optical disc is a DVD standard disc (on the left side from the central axis). Only the part is shown.) It is the top view and sectional drawing which show embodiment of the spacer comprised so that it might adapt to the optical disk of FIG. FIG. 14 is a cross-sectional view showing a cross-sectional structure of an optical disc to which the spacer 52 of FIG. FIG. 14 is a schematic cross-sectional view showing an enlarged vicinity of a track 74 of the spacer 52 in FIG. 13. Implementation of an optical disk recording apparatus capable of recording and reproducing data with respect to the data recording layer 28 of the optical disk 54 of FIG. 14 and forming an image on the image forming layer 19 of the optical disk 54 using the spacers 52 of FIGS. It is a block diagram which shows the form. It is a flowchart which shows the control content of the control means 92 of FIG. It is operation | movement explanatory drawing which shows the operation content by control of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10,54 ... Optical disk, 10a, 54a ... Optical disk surface, 10b, 54b ... Label surface, 10A ... PCA area, 10B ... PMA area, 10C ... Lead-in area, 12 ... Optical pickup, 16 ... Turntable, DESCRIPTION OF SYMBOLS 19 ... Image forming layer, 20 ... Laser beam, 26, 56 ... Optical disk substrate, 28 ... Data recording layer, 30, 52 ... Spacer, 31 ... Reflective layer, 36, 62, 64 ... Stack ring (on the label surface of the optical disk) Formed concave or convex structure), 42, 70 ... ring portion (convex or concave structure formed on the spacer), 43, 71 ... adhesive surface, 66 ... data recording area, 68 ... spacer substrate (spacer substrate), 74 ... track, 76 ... reflection film.

Claims (11)

The optical disk is set on a turntable with the label side facing the optical pickup, rotated, and irradiated with the laser beam emitted from the optical pickup to the image forming layer formed on the label surface of the optical disk, A jig that is sandwiched between the turntable and the optical disc when changing the visible light characteristics of the image forming layer to form an image on the image forming layer,
An optical disk label surface image forming spacer having an adhesion structure for fixing the optical disk to itself.   The contact structure is a concave structure that fits at least one of the convex structures when a convex structure is formed on the label surface of the optical disk in a state where the central axes of the optical disk and the spacer are aligned, or 2. The optical disk label surface image forming according to claim 1, wherein, when a concave structure is formed on the label surface of the optical disk, the optical disk label surface image forming has at least one convex structure fitted to at least one of the concave structures. Spacer for.   The adhesion structure is an adhesive surface in which an adhesive is applied to a surface of the spacer facing the optical disc so that the spacer is detachably attached to the optical disc. Item 5. An optical disk label surface image forming spacer according to Item 1. The adhesion structure is
When a convex structure is formed on the label surface of the optical disk in a state where the central axes of the optical disk and the spacer are aligned, a concave structure that fits at least one of the convex structures, or the label of the optical disk If the surface has a concave structure, it has at least one convex structure that fits into at least one of the concave structures; and
2. The optical disk according to claim 1, wherein the spacer has an adhesive surface coated with an adhesive on a surface facing the optical disk so that the spacer is detachably attached to and integrated with the optical disk. Label surface image forming spacer.   The track according to any one of claims 1 to 5, wherein a track on which information detectable by the optical pickup is recorded is formed in an area corresponding to an area on an inner circumference side of an area on which the image formation is to be performed on the optical disc. The optical disk label surface image forming spacer as described.   6. The optical disc label surface image forming spacer according to claim 5, wherein the information is recorded as pits or track wobbles.   7. The optical disc label surface image forming spacer according to claim 5, wherein the track is formed in a region corresponding to a lead-in region of the optical disc or a region corresponding to the lead-in region and a region immediately inside thereof. .   The track is formed on the surface facing the optical disc during image formation, the spacer substrate is formed transparent in the region where the track is formed, and is reflected on the surface side of the region where the track is formed The optical disk label surface image forming spacer according to any one of claims 5 to 7, wherein a film is formed.   The track is formed on a surface facing the optical disc at the time of image formation, and a spacer substrate is continuously formed from a region where the track is formed to a region corresponding to the region where the image formation is performed on the optical disc. The optical disk label surface image forming spacer according to claim 5, wherein the optical film label surface image forming spacer is formed in a transparent manner, and a reflective film is formed on the surface side of the region where the track is formed.   When the refractive index of the transparently formed region of the spacer substrate is n1, the thickness is L1, the refractive index of the substrate of the optical disk is n2, and the distance from the surface of the data recording surface to the reflective film is L2. 10. The optical disk label surface image forming spacer according to claim 8, wherein the thickness of the spacer substrate is set so as to satisfy n1 × L2 = n2 × L1. The optical disc is set on a turntable with the label surface facing the optical pickup, rotated, and the laser beam emitted from the optical pickup is irradiated to the image forming layer formed on the label surface of the optical disc. In a method for forming an image on the image forming layer by changing the visible light characteristics of the image forming layer,
11. An optical disc label surface image forming method for performing the image formation in a state where the optical disc label surface image forming spacer according to claim 1 is sandwiched between the turntable and the optical disc.

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