JP4123261B2 - Optical disc label surface image forming method and optical disc apparatus - Google Patents

Description

  The present invention relates to an optical disk label surface image forming method and an optical disk device, which can form an image on a label surface using laser light from the optical disk device, and in particular, an optical disk and laser light when performing image formation. Is related to relative movement.

  In a recordable optical disc, information (title and the like) related to the recorded content is entered along with the optical disc by the user so that the content recorded on the optical disc can be visually confirmed. In this case, in the case of a single-sided optical disk that is handled as a single disk without being accommodated in a cartridge such as a CD-based optical disk {CD-R (CD recordable), CD-RW (CD rewritable), etc.} It is generally done to write. As another method, information on recorded contents is edited on a personal computer, printed on a label by a printer, and pasted on a label surface.

In the method of writing directly on the disc label surface with a pen, the recording layer may be damaged if writing with a strong force using a hard pen or the like. Further, in the method of printing on a label with a printer, a printer is separately required.
SUMMARY OF THE INVENTION The present invention has been made in view of the above points. The label surface of an optical disc that can form an image on the label surface using laser light from an optical disc apparatus and eliminates the need for writing with a pen or printing with a printer. An image forming method, an optical disc apparatus, and an optical disc are provided.

According to the label surface image forming method of the present invention, a visible light characteristic {color (hue, lightness, saturation) from the label surface side by irradiation of laser light from the label surface side at a position visible from the label surface side of the optical disc. , Spectrum, reflectance, transmittance, light scattering, etc.} are changed, and the optical disc is set on the turntable of the optical disc apparatus with its label surface facing the laser beam incident side, The optical disk and the laser light emitted from the optical pickup are relatively moved along the surface of the optical disk, and the laser light emitted from the optical pickup in synchronization with the relative movement is used to form an image ( The visible light property changing layer is irradiated from the label surface side by being modulated according to image data of characters, pictures, etc., and the visible light property changing layer is visible by the irradiation. By changing the characteristics, and forms an image corresponding to the label surface. According to this label surface image forming method, the visible light characteristic changing layer formed at a position visible from the label surface side of the optical disk is irradiated with the laser light of the optical disk device to change the visible light characteristic of the layer, and Since images such as characters and pictures corresponding to the label surface are formed, writing with a pen and printing with a printer can be made unnecessary. In particular, the label surface image forming method according to the present invention moves the optical pickup in the radial direction of the optical disc at a pitch that creates a radial gap in the formed image while rotating the optical disc, and generates a vibration signal. by driving the tracking actuator of the optical pickup in, not the driving of the tracking actuator the gap in the radial direction the radial direction of eliminating the gap or the image of the image caused by the movement of the optical pickup Image formation is performed with a gap smaller than the gap generated in the case .
The label surface image forming method according to the present invention detects the reference position in the circumferential direction of the optical disc while rotating the optical disc, and moves the optical pickup in the radial direction of the optical disc to detect the optical pickup in the radial direction of the optical disc. It can be performed by moving in the direction by the predetermined pitch. Further, the reference position in the circumferential direction of the optical disc can be detected based on a pulse signal generated in synchronization with the rotation of the optical disc . Also, it can be assumed to perform control to the image formed on the rotating speed constant the optical disc based on the pulse signal.

An optical disc apparatus according to the present invention includes a relative movement mechanism that relatively moves an optical disc set on a turntable with a label surface facing a laser beam incident side and a laser beam emitted from an optical pickup along the surface of the optical disc, A laser modulation circuit that modulates a laser beam emitted from an optical pickup, the relative movement mechanism, and a control circuit for the laser modulation circuit, wherein the control circuit controls the relative movement mechanism to control the optical disc and the optical disc. Relative movement of the laser beam, and the laser modulation circuit is controlled according to the relative movement and image data of an image (character, picture, etc.) to be formed on the label surface of the optical disc, and emitted from the optical pickup. The laser beam to be modulated is modulated with the image data, and the corresponding image is formed in a place visible from the label side of the optical disc. Further, it controls to form an image on a visible light characteristic changing layer whose visible light characteristic changes by irradiation of the laser beam, and the relative movement mechanism rotates and drives the turntable, and the optical pickup. A radial feed driving device for moving the optical disc in a radial direction, the control circuit controls both of the driving devices to control relative movement between the optical disc and the laser beam, and the control circuit controls the rotation; While driving the drive device to rotate the optical disc, the radial feed drive device is driven to move the optical pickup in the radial direction of the optical disc at a pitch that creates a radial gap in the formed image . together, by driving the tracking actuator of the optical pickup in the vibration signal, in the radial direction of the optical pickup And an image is formed to be smaller than the gap of the image caused when not eliminate the gap in the radial direction of the image caused by the movement or the drive of the gaps tracking actuator of the image.
In the optical disk apparatus according to the present invention, the control circuit drives the rotational drive device at a constant rotational speed, and drives the radial feed drive device at the predetermined pitch for each predetermined rotational position, thereby The optical disk can be moved in the radial direction. Further, the apparatus further comprises a circumferential position detecting device for detecting a circumferential position of the optical disc and a radial position detecting device for detecting a radial position of the optical pickup, and the control circuit is emitted from the optical pickup. The laser light can be controlled to be modulated in accordance with the detection position of both position detection devices and the image data of an image (character, picture, etc.) to be formed on the label surface of the optical disc. Further, the circumferential position detection device includes a frequency generator that is rotated by the rotary drive device and generates a signal having a frequency corresponding to the rotation, and the frequency of the signal generated from the frequency generator is multiplied by a multiplier. Multiply, count the multiplied signal to detect the circumferential position of the optical disc, and the control circuit drives the rotational drive device at a constant rotational speed based on the signal generated from the frequency generator, Based on a signal generated from the frequency generator, the radial feed driving device is driven by a predetermined amount for each predetermined rotational position, and the circumferential position of the optical disc detected by the circumferential position detection device and the radial position detection are detected. The laser beam is modulated in accordance with the optical pickup radial position of the optical pickup detected by the apparatus and the image data of the image (character, picture, etc.) to be formed to form an image. It can be a thing. The control circuit may turn off the tracking servo and turn on or off the focus servo to perform relative movement between the optical disc and the laser beam. The optical disk apparatus of the present invention is an optical disk recording apparatus for a single-sided optical disk such as a CD-based optical disk such as CD-R or CD-RW, or a DVD-R (DVD recordable), DVD-RW (DVD rewritable), or the like. The optical disk recording apparatus can be a two-substrate bonded optical disk such as a DVD-based optical disk.

  Embodiments of the present invention will be described below. An embodiment of an optical disk used in the label surface image forming method of the present invention is shown in a partial sectional view in FIG. 2 (thicknesses of the respective layers are different from actual ones, and illustration of guide grooves is omitted). This is designed so that an image can be formed on the label surface of a CD-R disc. This optical disk 10 is formed by sequentially forming a dye layer (recording layer) 14, a reflective layer 16, a visible light characteristic changing layer 18, and a protective layer 20 on one side of a transparent substrate 12 such as polycarbonate, and is configured integrally as a whole. It is. It is the same as a normal CD-R disc except that there is a visible light characteristic changing layer 18. From the label surface 22 side, the visible light characteristic changing layer 18 can be desired through the transparent protective layer 20. The visible light characteristic changing layer 18 is irradiated with laser light having a predetermined power or more from the label surface 22 side, and the visible light characteristics {color (hue, brightness, saturation) from the label surface 22 side of the irradiated portion. , Spectrum, reflectance, transmittance, light scattering, etc., for example, the color of the photosensitive material or heat sensitive material changes {for example, white to color (black, etc.), transparent to color (black, etc.) Etc.} can be constituted by a layer of material (color change layer by photosensitive layer, heat-sensitive layer, etc.). When the visible light characteristic changing layer 18 is formed of a photosensitive layer, for example, with respect to laser light having a wavelength of 780 nm incident from the label surface 22 side, the laser light power is less than 1 mW, and the laser light is not exposed to 1 mW or more. Photosensitive materials that change color when exposed to light can be used. When the visible light characteristic changing layer 18 is formed of a heat-sensitive layer, for example, a heat-sensitive material that does not heat at less than 100 degrees Celsius but changes heat and discolors at 100 degrees Celsius or more can be used. When recording or reproducing data on the optical disc 10, laser light is incident from the substrate 12 side and is almost blocked by the reflective layer 16, so that the visible light characteristic changing layer 18 does not change in visible light characteristics. Further, as shown in FIG. 3, the visible light characteristic changing layer 18 has two-layer structures 18-1 and 18-2, and these two layers 18-1 and 18-2 are fused or mixed by laser light irradiation to be visible. It can also be configured such that the optical characteristics change.

As shown in FIG. 4, an intermediate layer 24 can be provided between the reflective layer 16 and the visible light characteristic changing layer 18. The intermediate layer 24 can be made of, for example, a material that improves adhesion between the reflective layer 16 and the visible light characteristic change layer 18, heat insulation, and the like. For the purpose of improving the adhesion, the intermediate layer 24 is made of a material having good adhesion to both the reflective layer 16 and the visible light characteristic changing layer 18. If the intermediate layer 24 is made of a heat-insulating material, heat during data recording and heat during image formation on the label surface are suppressed from being conducted to opposite sides, so that the heat during data recording is visible. It is possible to suppress the influence exerted on the optical characteristic changing layer and the influence exerted on the recording layer by the heat at the time of image formation on the label surface. Further, when the reflective layer 16 and the visible light characteristic changing layer 18 are in direct contact with each other, heat at the time of image formation on the label surface spreads in the surface direction through the reflective layer 16 (often made of metal) and is visible. Although there is a risk that the change efficiency of the visible light characteristic of the light characteristic change layer 18 is lowered or an image is blurred, if the intermediate layer 24 is made of a heat insulating material, the heat at the time of image formation on the label surface Is suppressed from spreading in the surface direction through the reflective layer 16, and the reduction in the efficiency of changing the visible light characteristics and the bleeding of the image can be prevented. By forming the intermediate layer 24 with a light scattering layer having translucent light scattering characteristics, it is possible to make the formed image easy to see.
As a technique for improving the adhesion between the reflective layer 16 and the visible light characteristic changing layer 18, instead of providing the intermediate layer, the visible light characteristic changing layer 18 has a large number of fine dots (for example, as shown in FIG. One point can be formed in a circular shape with a diameter of about several tens of μm or a non-circular shape having the same size (for example, using a technique such as film transfer). Further, in place of a large number of fine dots, a hole having a large number of fine holes 26 can be formed as shown in FIG. The reflective layer 16 and the protective layer 20 are directly bonded to each other outside the point when formed in the dot shape of FIG. 5 and inside the hole when formed in the hole shape of FIG. Can be improved. Further, even if the visible light characteristic changing layer 18 is opaque, the reflective layer 16 is partially formed from the label surface 22 side through the part where the visible light characteristic changing layer 18 is not provided and the reflective layer 16 and the protective layer 20 are directly joined. Therefore, it is possible to easily focus on the reflective layer 16 when forming an image on the label surface 22. In addition to dot-like and perforated shapes, concentric circles or straight stripes can be used.

Another embodiment of the optical disk used in the label surface image forming method of the present invention is shown in a partial sectional view in FIG. 7 (thicknesses of the respective layers are different from actual ones, and illustration of guide grooves is omitted). This is designed so that an image can be formed on the label surface of a CD-RW disc. In this optical disk 28, a dielectric layer 32, a recording layer 34, a dielectric layer 36, a reflective layer 38, a visible light characteristic changing layer 40, and a protective layer 42 are sequentially formed on one surface of a transparent substrate 30 such as polycarbonate, It is constructed integrally. Except for the presence of the visible light characteristic changing layer 40, it is the same as a normal CD-RW disc. From the label surface 44 side, the visible light characteristic changing layer 40 can be desired through the transparent protective layer 42. The visible light characteristic changing layer 40 can be configured in the same manner as the visible light characteristic changing layer 18 of the embodiment of FIG. Further, as in FIG. 4, an intermediate layer that enhances adhesion can be disposed between the reflective layer 38 and the protective layer 42. Further, the visible light characteristic changing layer 40 is formed into a large number of fine dots as in FIG. 5, or is formed into a perforated shape having a large number of fine holes as in FIG. 6, or concentric circles or straight stripes. It can be formed into a shape or the like.
FIG. 8 is a partial sectional view showing another embodiment of the optical disk used in the label surface image forming method of the present invention (thicknesses of the respective layers are different from actual ones, and illustration of guide grooves is omitted). This is a CD-RW disc 28 of FIG. 7 in which a separation layer 35, a second reflection layer 37, and an intermediate layer 39 are stacked between the reflection layer 38 and the visible light characteristic changing layer 40. The second reflective layer 37 can be composed of a metal layer, a dielectric reflective layer, or the like. According to this, the separation layers 35 and 38 are provided independently for image formation and data recording on the label surface, and are composed of a resin or the like interposed between the reflection layers 37 and 38. Functions as a buffer layer for heat conduction, so that it is possible to more reliably suppress the influence of heat at the time of data recording on the visible light characteristic change layer and the influence of the heat at the time of image formation on the label surface on the recording layer. The intermediate layer 39 is made of, for example, a material that improves the adhesion between the reflective layer 37 and the visible light characteristic changing layer 40 (a material having good adhesion to both the reflective layer 37 and the visible light characteristic changing layer 40). can do. Further, if the intermediate layer 39 is made of a heat insulating material, the heat at the time of image formation on the label surface is suppressed from spreading in the surface direction through the reflective layer 37, which reduces the change efficiency of visible light characteristics and blurs the image. Can be prevented. Further, by forming the intermediate layer 39 with a light scattering layer having a translucent light scattering characteristic, it is possible to make the formed image easy to see.
Another embodiment of the optical disk used in the label surface image forming method of the present invention is shown in a partial sectional view in FIG. 9 (thicknesses of the respective layers are different from actual ones, and illustration of guide grooves is omitted). In this method, an image can be formed on the label surface of a single-sided single-layer recording DVD-RW disc. In this optical disk 41, a dielectric layer 45, a recording layer 47, a dielectric layer 49, and a reflective layer 51 are sequentially formed on one surface of a transparent first substrate 43 made of polycarbonate or the like having a thickness of 0.6 mm. A 0.6 mm-thick second substrate 55 (usually a transparent substrate) made of polycarbonate or the like is bonded to the substrate by a bonding adhesive layer 53. On the surface of the second substrate 55, a second reflective layer 57, an intermediate layer 59, a visible light characteristic changing layer 61, and a protective layer 63 are sequentially laminated. The surface on the protective layer 63 side constitutes the label surface 65. Data recording is performed by irradiating the recording layer 47 with laser light from the surface side of the first substrate 43. The image formation of the label surface 65 is performed by irradiating the visible light characteristic changing layer 61 with laser light from the label surface 65 side.
The second reflective layer 57 can be composed of a metal layer, a dielectric reflective layer, or the like. The intermediate layer 59 is, for example, a material that improves the adhesion between the second reflective layer 57 and the visible light characteristic changing layer 61 (a material that has good adhesion to both the reflective layer 57 and the visible light characteristic changing layer 61. ). Further, if the intermediate layer 59 is made of a heat insulating material, the heat at the time of image formation on the label surface is suppressed from spreading in the surface direction through the reflective layer 57, so that the change efficiency of visible light characteristics and the blurring of the image are suppressed. Can be prevented. Further, by forming the intermediate layer 59 with a light-scattering layer having translucent light scattering characteristics, it is possible to make the formed image easy to see.

  FIG. 1 shows an embodiment of an optical disk apparatus according to the present invention (only the part related to image formation on the label surface is shown). This is configured as a CD-R / RW drive (an optical disc recording apparatus capable of recording and reproducing data on CD-R discs and CD-RW discs) used by being connected to a host computer 46 such as a personal computer. is there. In the CD-R / RW drive 48, the optical disk 50 (the CD-R disk 10 in FIGS. 2 to 6, the CD-RW disk 28 in FIG. 7, etc.) is reversed (with the label surface 52 facing downward). It is placed on the turntable 54 and is driven to rotate by a spindle motor 56. A frequency generator 58 (FG) is directly connected to the rotation shaft of the spindle motor 56, and a pulse signal (FG pulse) is generated from the frequency generator 58 at every rotation angle obtained by dividing one rotation of the spindle motor 56 by a predetermined integer. Is done. The FG pulse is multiplied to a predetermined multiple by a multiplier 60 composed of a PLL circuit or the like, and input to a system control circuit (CPU) 62 to be used for detection of a disk circumferential position. The spindle servo circuit 64 controls the spindle motor 56 at a constant rotational speed at the rotational speed instructed from the system control circuit 62 based on the FG pulse when forming the image on the label surface.

  Below the optical disk 50, an optical pickup 66 for recording data, reproducing data, and forming an image on a label surface is disposed. The optical pickup 66 is supported by a feed screw 68 so as to be movable in the radial direction of the optical disc 50. The optical pickup 66 is transported in the radial direction of the optical disk 50 by driving the feed motor 72 via the motor driver 70 and rotating the feed screw 68 in accordance with a command from the system control circuit 62. The position of the optical pickup 66 in the radial direction of the optical disk is detected by a feed position detector 74 such as a linear scale. The focus servo circuit 76 performs focus control by driving the focus actuator of the optical pickup 66 based on the focus error signal in response to a command from the system control circuit 62. When forming an image on the label surface, the focus servo circuit 76 is turned on. When recording or reproducing data, the tracking servo circuit 78 performs tracking control by driving the tracking actuator of the optical pickup 66 based on the tracking error signal according to a command from the system control circuit 62. When forming an image on the label surface, the tracking servo circuit 78 is turned off. The vibration signal generation circuit 80 generates a predetermined vibration signal according to a command from the system control circuit 62 and supplies it to the tracking actuator when forming an image on the label surface. As a result, the objective lens of the optical pickup 66 vibrates in the radial direction of the optical disk 50, and the scanning interval of the laser light for each round is filled, so that a clear image is obtained.

  The laser driver 82 drives the laser diode of the optical pickup 66 in accordance with a command from the system control circuit 62, and irradiates the optical disk 50 with the laser light to perform data recording, data reproduction, and image formation on the label surface. That is, the laser diode emits a laser beam having a recording power modulated by a recording signal during data recording, emits a laser beam having a constant reproduction power during data reproduction, and forms an image when forming an image on the label surface. Laser light modulated with image data such as letters, pictures, etc. (high power that causes changes in the visible light characteristics of the visible light characteristic changing layer in the image forming part, and the visible light characteristic changing layer in the part where no image is formed) Laser light having a low power that does not cause a change in visible light characteristics) is emitted. When image formation on the label surface is performed, image data such as characters and pictures to be image-edited edited by the user is sent from the host computer 46 to the CD-R / RW drive 48. This image data is, for example, data represented by coordinates (r, θ) based on a combination of a radial position r (distance from the center of rotation) and a circumferential position θ (circumferential angle with respect to an appropriate reference position). For example, for each radial position r having a predetermined pitch Δr, the image forming section represented by an angle θ is defined.

The image forming process of the label surface of the optical disk 50 by the CD-R / RW drive 48 of FIG. 1 is performed as follows, for example.
(1) The optical disk 50 is mounted on the turntable 54 so that it is upside down from the time of data recording or reproduction.
(2) A user edits an image such as a character or a picture to be formed on the display of the host computer 46. The host computer 46 converts the edited image into image data.
(3) The user instructs the start of the image forming operation on the host computer 46.
(4) The spindle servo circuit 64 controls the spindle motor 56 by CAV (constant rotational speed) so that the pulse generated from the frequency generator 58 has a constant frequency commanded by the system control circuit 62.
(5) The optical pickup 66 is positioned at a predetermined radial reference position on the inner peripheral side of the optical disc 50.
(6) The laser power of the laser diode of the optical pickup 66 is a predetermined low output commanded by the system control circuit 62 (the visible light characteristic of the visible light characteristic changing layer does not change and the focus control is possible). The laser driver 82 drives the laser diode so that the value is 1 mW or less.
(7) The focus servo circuit 76 is turned on according to an instruction from the system control circuit 62. Thereby, the focus servo circuit 76 applies focus servo so that the laser beam 67 becomes the minimum spot on the reflection layer. The tracking servo circuit 78 remains off and no tracking servo is applied.
(8) Preparation for image formation is now complete, and image formation is started by an instruction from the system control circuit 62. That is, the system control circuit 62 inputs image data from the host computer 46, drives the feed motor 72, and positions the optical pickup 66 at the radial position where the first image forming portion is located on the inner peripheral side of the optical disk 50, and the FG pulse. The output pulse of the multiplier 60 is counted by using an appropriate timing based on (or a detection timing of a detector provided separately for detecting a circumferential reference position) as a circumferential reference position, and the circumferential position θ The laser power is detected at each image forming position in the circumferential direction indicated by the image data for the radial position at a predetermined high output (a value at which the visible light characteristic of the visible light characteristic changing layer changes, for example, a value of 1 mW or more ). As a result, the visible light characteristic of the visible light characteristic change layer changes (discoloration or the like) at the portion irradiated with the high-power laser light, and image formation is performed. When the optical disk 50 makes one rotation and returns to the reference position in the circumferential direction, the feed motor 62 is driven to move the optical pickup 66 in the outer circumferential direction by a predetermined pitch Δr, and the radial position in the circumferential direction indicated by the image data. Image formation is performed by switching the laser power to a predetermined high output at each image forming position. Thereafter, this operation is repeated, and image formation is performed by sequentially moving in the outer circumferential direction at a predetermined pitch Δr every round. FIG. 10 shows the locus of the laser beam on the label surface 52 of the optical disc 50 by this image forming operation. The laser power is switched to a high output at the portion drawn with a thick line, and image formation is performed. FIG. 11 shows a change in laser power when the image formation of FIG. 10 is performed.

  It should be noted that a radius position where there is no image forming portion is not scanned, and the next image forming portion moves to a certain radial position at a time to form an image. Further, when the pitch Δr is large, as shown in FIG. 12, even if the image should originally be formed in the radial direction, a gap occurs and an image is formed. If the pitch Δr is reduced, the gap can be made inconspicuous, but the number of rounds required to form an image on the entire label surface increases, and the image formation takes time. Therefore, in the CD-R / RW drive 48 of FIG. 1, the tracking actuator is driven by a vibration signal (sine wave, triangular wave, etc.) generated from the vibration signal generation circuit 80 during image formation, and the objective lens is moved in the disk radial direction. I try to vibrate. As a result, as shown in FIG. 13, the laser beam oscillates in the radial direction of the disk, so that an image can be formed without a gap (or with a small gap) even if the pitch Δr is relatively large. The frequency of the vibration signal can be set to about several kHz, for example. The pitch Δr can be set to about 50 to 100 μm, for example.

  FIG. 14A shows an actual image formation example of the label surface 52 by the CD-R / RW drive 48 of FIG. FIG. 4B shows a partially enlarged view of the locus of the laser beam when this is formed. When scanning the position of the radius r1, the laser power is output at a high angle in the interval of θ1 to θ2. It shows the state to be. FIGS. 15A, 15B, and 15C show other examples of image formation on the label surface 52 by the CD-R / RW drive 48, respectively. Arbitrary character information such as a disc title, song name, artist name, picture, etc. can be formed as an image.

  In the above-described embodiment, the visible light characteristic changing layer is disposed between the reflective layer and the protective layer. However, the visible light characteristic changing layer is provided at any position (for example, on the protective layer) that is visible from the label surface side of the optical disc. Can be arranged. Further, in the above-described embodiment, the case where image formation is performed on an optical disc integrally formed with the visible light characteristic change layer has been described. However, image formation by the label surface image forming method or the optical disc apparatus of the present invention is not limited to this. is not. That is, an image can be formed by applying the label surface image forming method or the optical disk device of the present invention to an optical disk in which a label having a visible light characteristic changing layer is attached to the label surface. In the above embodiment, the image is formed on the label surface while applying the focus servo. However, if the image resolution is not required, the image can be formed without applying the focus servo. In this case, since it is not necessary to obtain the reflected light necessary for the focus servo, the visible light characteristic changing layer can be formed in an opaque state in which the reflective layer cannot be seen through. In the embodiment, the image is formed by modulating the power of the laser beam according to the image data. However, the visible light characteristic can be obtained by modulating the image according to the image data with parameters of the laser beam other than the power. If there is a parameter that can change the visible light characteristic of the change layer, the parameter can be modulated to form an image. In addition, the visible light characteristic change mode of the visible light characteristic change layer is not limited to the above-described one, and may be any change that can be visually recognized. In the above embodiment, the images are sequentially formed from the inner periphery side to the outer periphery side of the disc. However, the present invention is not limited to this. Image formation can be performed in order. In the above embodiment, the case of forming an image on a CD-R disc or a CD-RW disc has been described. However, the present invention can also be applied to the case of forming an image on another optical disc. In the above embodiment, the case where the present invention is applied to an optical disk apparatus connected to a host computer has been described. However, the present invention is not limited to this, and the present invention is applied to an optical disk apparatus used alone, such as a CD recorder. Can also be applied.

1 is a system configuration block diagram showing an embodiment of an optical disk device of the present invention. It is a fragmentary sectional view which shows embodiment of the optical disk used for the label surface image forming method of this invention. It is a fragmentary sectional view which shows the modification of the optical disk of FIG. It is a fragmentary sectional view which shows the modification of the optical disk of FIG. It is a fragmentary sectional view which shows the modification of the optical disk of FIG. It is a fragmentary sectional view which shows the modification of the optical disk of FIG. It is a fragmentary sectional view which shows other embodiment of the optical disk used for the label surface image forming method of this invention. It is a fragmentary sectional view which shows other embodiment of the optical disk used for the label surface image forming method of this invention. It is a fragmentary sectional view which shows other embodiment of the optical disk used for the label surface image forming method of this invention. FIG. 2 is a plan view showing a locus of laser light on a label surface by an image forming operation on the label surface using the CD-R / RW drive of FIG. 1. It is a diagram which shows the change of the laser power when performing image formation of FIG. It is a top view which shows the locus | trajectory of the laser beam on a label surface when image formation is performed without vibrating a laser beam in the disk radial direction. It is a top view which shows the locus | trajectory of the laser beam on a label surface when image formation is performed by vibrating a laser beam in the disk radial direction. FIG. 2 is a plan view showing an example of image formation on a label surface by the CD-R / RW drive of FIG. 1. FIG. 6 is a plan view showing another example of image formation on the label surface by the CD-R / RW drive of FIG. 1.

Explanation of symbols

  10, 28, 41, 50 ... optical disc, 12, 30, 43, 55 ... substrate, 14, 34, 47 ... recording layer, 16, 38, 51 ... reflective layer, 18, 40, 61 ... visible light property changing layer, 20, 42 ... protective layer, 22, 44, 52 ... label surface, 24, 39, 59 ... intermediate layer, 26 ... hole, 35 ... separation layer, 37, 57 ... second reflective layer, 48 ... CD-R / RW drive (optical disk device), 54 ... turntable, 56 ... spindle motor (rotary drive device), 58 ... frequency generator (circumferential position detection device), 60 ... multiplier, 62 ... system control circuit (control circuit), 66 ... optical pickup, 67 ... laser light, 68, 72 ... relative movement mechanism, 72 ... feed motor (radial feed drive device), 74 ... feed position detector (radial position detector), 76 ... focus servo circuit, 78 ... Tsu King servo circuit, 80 ... oscillation signal generation circuit, 82 ... laser driver (laser modulation circuit)

Claims (10)

A visible light property changing layer in which the visible light property from the label surface side is changed by irradiation of the laser beam from the label surface side is formed at a location visible from the label surface side of the optical disc, An optical disc is set with its label surface facing the incident side of the laser beam emitted from the optical pickup, and the optical disc and the laser beam are moved relative to each other along the surface of the optical disc, in synchronization with the relative movement. The laser light is modulated in accordance with image data of an image to be imaged and irradiated to the visible light property changing layer from the label surface side, and the visible light property of the visible light property changing layer is changed by the irradiation. Then, in the label surface image forming method of the optical disk for forming an image corresponding to the label surface,
While rotating the optical disc, the optical pickup is moved in the radial direction of the optical disc at a pitch that creates a radial gap in the formed image, and the tracking actuator of the optical pickup is driven by a vibration signal , and less than the gap of the image caused when not the driving of the radial the radial direction of the clearance of the lost or in the image gap image tracking actuator caused by the movement of the optical pickup A label surface image forming method of an optical disk for forming an image.   The optical pickup is moved in the radial direction of the optical disk by rotating the optical disk, detecting a reference position in the circumferential direction of the optical disk, and moving the optical pickup in the radial direction of the optical disk by the predetermined pitch. The label surface image forming method of an optical disk according to claim 1 to be performed.   3. The label surface image forming method for an optical disc according to claim 2, wherein the detection of the reference position in the circumferential direction of the optical disc is performed based on a pulse signal generated in synchronization with the rotation of the optical disc.   4. The label surface image forming method for an optical disk according to claim 3, wherein the image formation is performed by controlling the optical disk at a constant rotation speed based on the pulse signal. Wherein the circumferential position of the optical disc is detected based on the pulse signal, and the circumferential position of the optical disc issued該検, and the optical disk radial position of the optical pickup to be detected separately, corresponding to the image data of the image to be formed 5. The label surface image forming method for an optical disc according to claim 4, wherein the laser beam is modulated to form an image. A relative movement mechanism for relatively moving the optical disk set with the label surface facing the laser light incident side on the turntable and the laser light emitted from the optical pickup along the surface of the optical disk;
A laser modulation circuit for modulating laser light emitted from the optical pickup;
Comprising the relative movement mechanism and a control circuit of the laser modulation circuit;
The control circuit controls the relative movement mechanism to move the optical disk and the laser light relatively, and the image data of an image to be formed on the label surface of the relative movement and the optical disk of the laser modulation circuit. The laser beam emitted from the optical pickup is modulated with the image data, and the corresponding image is formed at a position visible from the label surface side of the optical disc. In an optical disc apparatus that performs control to form an image on a visible light characteristic changing layer whose characteristics change,
The relative movement mechanism includes a rotation drive device that rotates the turntable, and a radial feed drive device that moves the optical pickup in the radial direction of the optical disk, and the control circuit controls both the drive devices to Controlling the relative movement of the optical disc and the laser beam,
Wherein the control circuit, while rotating the optical disk by driving the rotary drive device, in the radial direction of the radial feed drive device optical disc the optical pickup by driving the radial clearance in the image to be formed is moved at a pitch causing vibration by driving the tracking actuator of the optical pickup signals, the radial eliminate the gap or the image of the image caused by the movement of the radial direction of the optical pickup An optical disc apparatus that forms an image by making the gap smaller than the gap of the image generated when the tracking actuator is not driven .   The control circuit drives the rotational drive device at a constant rotational speed, and drives the radial feed drive device by the predetermined pitch for each predetermined rotational position, thereby moving the optical pickup in the radial direction of the optical disk. The optical disk apparatus according to claim 6 to be performed. A laser beam emitted from the optical pickup by the control circuit, further comprising a circumferential position detection device for detecting a circumferential position of the optical disc and a radial position detection device for detecting a radial position of the optical pickup. 8. An optical disk apparatus according to claim 6, wherein the optical disk apparatus performs control to modulate the image in accordance with the detection position of both position detection apparatuses and image data of an image to be formed on the label surface of the optical disk. The circumferential position detection device includes a frequency generator that is rotated by the rotary driving device and generates a signal having a frequency corresponding to the rotation, and a frequency of the signal generated from the frequency generator is multiplied by a multiplier. , Detecting the circumferential position of the optical disc by counting the multiplied signal,
The control circuit drives the rotational driving device at a constant rotational speed based on a signal generated from the frequency generator, and the radial feed driving device is driven at every predetermined rotational position based on a signal generated from the frequency generator. An image of an image to be formed, driven by a predetermined amount, and the circumferential position of the optical disc detected by the circumferential position detection device, the radial position of the optical pickup of the optical pickup detected by the radial position detection device, and 9. The optical disc apparatus according to claim 8, wherein the laser beam is modulated according to data to form an image.   10. The optical disc apparatus according to claim 6, wherein the control circuit turns off the tracking servo and turns on or off the focus servo to perform relative movement between the optical disc and the laser beam.

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