JP4367442B2 - Optical disc drawing method and optical disc drawing apparatus - Google Patents

Description

The present invention relates to an optical disk drawing method and an optical disk drawing equipment for performing the formation of a visible image (drawing) on the surface of the optical disk is obtained by allowing a visible image on a high quality.

  An optical disk recording apparatus that forms a drawing layer such as a heat-sensitive layer and a photosensitive layer on the surface of an optical disk such as a recordable CD and a recordable DVD and records data on the data recording layer of the optical disk is also used as an optical disk drawing apparatus. Japanese Patent Application Laid-Open No. 2004-151867 discloses a technique for performing drawing on the drawing layer by irradiating the drawing layer with laser light modulated according to image data from an optical pickup. The technique described in Patent Document 1 emits two laser beams coaxially from one optical pickup, irradiates one of the laser beams to a data recording layer, and performs focus control and tracking control to record data. In parallel with the data recording, position information is detected from the data recording layer with the laser light, and drawing is performed at a predetermined position on the drawing layer with another laser light based on the detected position information. Is.

Japanese Patent Laying-Open No. 2005-346886 (FIG. 2)

  In the technique described in Patent Document 1, the optical system of the optical pickup is configured so that when one beam is in focus on the data recording layer by focus control, the other beam is just in focus on the drawing layer. Yes. However, the distance between the data recording layer and the drawing layer varies from disk to disk due to variations in the thickness of the substrate disposed between the two layers. Further, even in one disk, the distance between the data recording layer and the drawing layer varies depending on the part. In the technique described in Patent Document 1, since drawing is performed with the other beam while one beam is focused on the data recording layer, if there is a variation in the distance between the data recording layer and the drawing layer, The focus position of the beam varies. For this reason, there has been a problem that the drawing state of the drawn image (image density, etc.) varies from disk to disk, and unevenness occurs in the image drawn depending on the part within one disk.

The present invention solves the above-mentioned drawbacks of the prior art, and uses an optical pickup that emits a first beam and a second beam from one objective lens to draw a visible image with high quality, and an optical disc drawing method. it is intended to provide an optical disk drawing equipment.

  The optical disk drawing method of the present invention uses an optical disk in which a data recording layer on which tracks are formed and a drawing layer capable of forming a visible image are laminated, and a first beam from one objective lens of an optical pickup. The focusing positions of the second beams are shifted from each other in the fixed-distance spectral axis direction in which the focusing position of the second beam approximates the interval between the data recording layer and the drawing layer in the optical disc. Arranged on the data recording layer side, and emitted so that a focal position of the second beam is arranged on the drawing layer side, setting the intensity of the first beam to reproduction power, and The tracking of the data recording layer is controlled by the tracking actuator of the objective lens without focus control on the data recording layer, and the second beam is to be formed. The intensity of the visual image is modulated according to the image data, and the drawing layer is controlled by a focus actuator of the objective lens to control the drawing layer to a predetermined in-focus state, and the first beam Thus, the visible image is formed on the drawing layer with the second beam while tracking the track of the data recording layer and controlling the focus on the drawing layer with the second beam. .

  According to this optical disc drawing method, since the drawing is performed on the drawing layer with the second beam while performing the focus control on the drawing layer with the second beam, the second beam is applied to the drawing layer. On the other hand, it is possible to perform drawing while always maintaining a predetermined in-focus state. Therefore, even if the distance between the data recording layer and the drawing layer varies from disk to disk or within a single disk, the rendered state (image density, etc.) of the rendered image varies from disk to disk. It is possible to perform high-quality drawing by preventing unevenness in an image drawn by a part in a single disc.

  Also, according to this optical disk drawing method, the focus of the first beam and the second beam is not controlled at the time of drawing, but the focusing position of the first beam and the second beam is the distance between the data recording layer and the drawing layer in the optical disk. Fixed distance (distance in which the second beam is focus-controlled with respect to the drawing layer and the distance with which the first beam can be track-controlled with respect to the track of the data recording layer) so as to be shifted from each other in the direction of the spectral axis. Since the light beam is emitted from one objective lens of the optical pickup, the focus of the second beam on the drawing layer is inevitably almost focused on the data recording layer. The recording layer track can be tracked. Therefore, in this optical disc drawing method, drawing is performed while tracking control is performed on the track of the data recording layer with the first beam. As a result, high-quality drawing can be performed in a precise manner at the track pitch.

  The optical disc drawing apparatus according to the present invention uses an optical disc in which a data recording layer having tracks formed thereon and a drawing layer capable of forming a visible image are stacked, and forms a visible image on the drawing layer of the optical disc. An optical disc drawing apparatus, wherein a first beam and a second beam from one objective lens are fixed distance spectral axes whose focusing positions approximate the distance between the data recording layer and the drawing layer in the optical disc. The optical pickup emits the first beam in such a manner that the in-focus position of the first beam is arranged on the data recording layer side and the in-focus position of the second beam is arranged on the drawing layer side. And the intensity of the first beam is set to the reproduction power, and the data recording layer is controlled by the tracking actuator of the objective lens without focus control with respect to the data recording layer. A control circuit that performs tracking control on a track, and controls the drawing layer with respect to the drawing layer by performing focus control on the drawing layer by a focus actuator of the objective lens; A beam modulation circuit that modulates the intensity of the beam in accordance with image data of a visible image to be formed, and controls tracking of the track of the data recording layer with the first beam and the second beam. The visible image is formed on the drawing layer with the second beam while controlling the focus on the drawing layer.

  In this optical disk drawing apparatus, a beam driving circuit drives the first beam with a fixed driving value without forming a servo loop, and forms a servo loop based on the beam power detection of the beam power of the second beam. Can be controlled. According to this, even when the optical pickup is configured to share the beam power monitor for the first beam and the second beam, the drawing method of the present invention can be implemented.

  In this optical disk drawing apparatus, for an optical disk in which the data recording layer is arranged closer to the laser incident surface than the drawing layer, the in-focus position of the beam emitted from the objective lens is the laser incident position. The beam closer to the surface constitutes the first beam, the beam far from the laser incident surface in the focusing position constitutes the second beam, and the data recording layer is located on the laser incident surface rather than the drawing layer. For the optical disc disposed on the far side from the laser beam, the beam far from the laser incident surface of the beam emitted from the objective lens is the first beam, and the focus position is the laser. The beam closer to the incident surface can be configured as the second beam. According to this, for either an optical disc in which the data recording layer is arranged closer to the laser incident surface than the drawing layer, or an optical disc in which the drawing layer is arranged closer to the laser incident surface than the data recording layer However, drawing can be performed on the drawing layer.

  The optical disc drawing apparatus can perform data recording while performing focus control and tracking control with the first beam on the data recording layer when the visible image is not formed on the drawing layer. Can be configured. According to this, the disk recording device can also be used.

  The optical disc drawing apparatus permits a drawing operation on the drawing layer on the condition that identification information indicating that the optical disc includes a drawable drawing layer is obtained from the recording information of the data recording layer. If the identification information cannot be obtained from the recorded information, the drawing operation can be prohibited. According to this, for example, when an optical disk having a structure in which two data recording layers are laminated is loaded, it is possible to prevent erroneous drawing on one of the data recording layers.

  The optical disc drawing apparatus is configured to perform data recording on an optical disc having a data recording layer and no drawing layer while performing focus control and tracking control with any of the beams on the data recording layer. can do. According to this, it is possible to perform data recording on an optical disc having no drawing layer.

  The optical disk recording medium of the present invention has a structure in which a first transparent substrate, a drawing layer, a semitransparent reflective layer, a second transparent substrate, a data recording layer, and a reflective layer are sequentially laminated and integrated from the beam incident surface side. A visible image is formed on the drawing layer and data is recorded and reproduced on the data recording layer by a beam incident from the beam incident surface side, and the visible image formed on the drawing layer is transferred to the beam incident surface side. It is comprised so that visual recognition is possible. In this case, on the reflective layer, a visible image visible from the surface opposite to the beam incident surface is further printed or printed from the surface opposite to the beam incident surface. Can do.

  Another optical disk recording medium of the present invention is formed by sequentially laminating a first transparent substrate, a data recording layer, a semitransparent reflection layer, a second transparent substrate, a drawing layer, and a semitransparent reflection layer from the beam incident surface side. The visible image is formed on the drawing layer and the data is recorded and reproduced on the data recording layer by the beam incident from the beam incident surface side, and the visible image formed on the drawing layer is It is configured to be visible from the side opposite to the beam incident surface.

  The optical disk recording medium of the present invention may be recorded with identification information indicating that the data recording layer includes a drawing layer on which the optical disk recording medium can be drawn. According to this, it is possible to make the optical disc drawing apparatus recognize that the optical disc recording medium has a drawing layer capable of drawing.

  Embodiment 1 of the present invention will be described. FIG. 1 shows the system configuration of an optical disc apparatus 10 with a drawing function to which the present invention is applied. The optical disk apparatus 10 records and reproduces data on an existing CD standard disk, records and reproduces data on an existing DVD standard disk, and records and reproduces and draws data on a CD standard recordable / drawable optical disk according to the present invention. Data can be recorded / reproduced and drawn on a DVD standard recordable / drawable type optical disc. The CD standard recording + drawable type optical disc and the DVD standard recording + drawable type optical disc according to the present invention are formed by laminating a data recording layer and a drawing layer as will be described later, and data recording / reproduction is performed on the data recording layer. The drawing is performed on the drawing layer.

  The optical disk 12 is rotationally driven by a spindle motor 14. The spindle motor 14 outputs FG pulses at equal angular intervals by a predetermined number of pulses per rotation. The optical pickup 16 is transported in the radial direction of the optical disk 12 by the thread feed motor 11. Two laser beams 20 and 22 (both are main beams) emitted from two laser diodes are coaxial from the objective lens 18 of the optical pickup 16 and their focusing positions are data recording layers in the optical disk 12. And are output so as to be shifted from each other in the fixed-distance spectral axis direction approximating the interval between the drawing layers. Here, it is assumed that the laser beam 20 is for CD and the laser beam 22 is for DVD. Data recording, data reproduction and drawing are performed alternatively (non-simultaneously).

  Recording data such as music is sent from the host computer 13 during data recording, and image data is sent out during drawing. This recording data or image data is transferred to the optical disk device 10 and input to the signal processing unit 17 via the buffer memory 15. The signal processing unit 17 is configured by a DSP (Digital Signal Processor), and includes a control unit 19, an encoder 21, a decoder 23, and the like. The recording data input to the signal processing unit 17 is encoded by the encoder 21 (EFM modulation when the optical disk 12 is a CD standard disk, and 8/16 modulation when the optical disk 12 is a DVD standard disk). The encoded recording data (“1”, “0” binary recording pulse) is subjected to appropriate time axis correction by the strategy circuit 25 and supplied to the laser driver 27. The laser driver 27 supplies a drive current to a laser diode (CD laser diode for CD data, DVD laser diode for DVD data) in the optical pickup 16 according to the recording data, and data recording on the optical disk 12 is performed. Record data on the layer.

  The image data input to the signal processing unit 17 is appropriately encoded by the encoder 21 and then input to the pulse generation unit 31 via a FIFO (First-In First-Out) memory 29. The pulse generation unit 31 generates “1” and “0” binary pulse signals (drawing pulses) for each pixel constituting the image data based on the input image data. That is, the image data is composed of data representing the gradation of each pixel to be rendered (gradation data), and the pulse generation unit 31 uses a constant rendering allocation time per pixel to convert the gradation data of each pixel. In response to this, drawing pulses whose duty changes are sequentially generated. The drawing pulse generated by the pulse generator 31 is subjected to appropriate time axis correction by the strategy circuit 25 and supplied to the laser driver 27. The laser driver 27 drives a laser diode (CD laser diode or DVD laser diode) in the optical pickup 16 in accordance with the drawing pulse, and performs drawing on the drawing layer of the optical disk 12. One drawn pixel is recognized as one point (dot) by the human eye, and the difference in duty of each dot is perceived as a difference in drawing density by the human eye (the higher the duty, the darker the drawing. Thus, monochrome multi-gradation drawing is realized.

  The wobble detection circuit 33 detects a wobble signal from the return optical signal of the optical pickup 16 at the time of data recording and reproduction. The RF circuit 35 amplifies the return optical signal (RF signal) of the optical pickup 16 at the time of data recording and reproduction. The decoder 23 of the signal processing unit 17 decodes this RF signal (EFM demodulation when the optical disk 12 is a CD standard disk and 8/16 demodulation when the optical disk 12 is a DVD standard disk) to demodulate the recording data. The demodulated recording data is transferred to the host computer 13 via the buffer memory 15.

  The servo circuit 37 returns light from the optical pickup 16 during data recording and reproduction (return light from the CD laser light 20 during recording and reproduction of CD data, and return light from the DVD laser light 22 during recording and reproduction of DVD data. ), Focus control, tracking control, and thread feed control of the optical pickup 16 are performed. The servo circuit 37 controls the spindle motor 14 to a constant linear velocity (CLV) based on the wobble signal during data recording, and the linear velocity constant based on a reproduction clock reproduced from the wobble signal or RF signal during data reproduction. To control.

  The servo circuit 37 performs focus control based on the return light at the reproduction power (non-drawing power) of the laser beam used for drawing out of the return light of the optical pickup 16 at the time of drawing, and is not used for drawing. Tracking control and thread feed control are performed based on the return light of the laser beam of the other reproduction power. The servo circuit 37 controls the spindle motor 14 at a constant rotational speed (CAV) based on the FG pulse output from the spindle motor 14 at the time of drawing.

  An ALPC (Automatic Laser Power Control) circuit 39 is based on the laser power detected by the front monitor in the optical pickup 16, and the reproduction power and recording power of the laser beam for performing data recording at the time of data recording are the data reproduction at the time of data reproduction. The laser driver 27 is controlled so that the reproduction power of the laser beam for performing the above matches the value commanded by the control unit 19. Further, the ALPC circuit 39 is based on the laser power detected by the front monitor in the optical pickup 16 during drawing, and the recording power (drawing power) and reproduction power (non-drawing power) of the laser beam used for drawing. The laser driver 27 is controlled so as to match the value commanded by the control unit 19. In this embodiment, as will be described later, since the optical pickup 16 has only one front monitor, the reproduction power of the laser light not used for drawing (used for tracking control) is ALPC. Drive with fixed drive value without control.

  An example of the layer structure of a drawable optical disc according to the present invention will be described with reference to FIGS. 2 and 3 show a CD standard recording + drawable type optical disc, and FIG. 4 shows a DVD standard recording + drawable type optical disc. Each of the optical discs 12 of FIGS. 2 to 4 can perform data recording and reproduction on the data recording layer and drawing on the drawing layer by entering laser beams 20 and 22 having different wavelengths and in-focus positions from the same surface side. . The surface of the optical disk 12 on which the laser beams 20 and 22 are incident is referred to as “laser incident surface 12a”, and the opposite surface is referred to as “label surface 12b”. Each of FIGS. 2 to 4 shows the state at the time of drawing where drawing is performed with the other laser beam while tracking control is performed on the data recording layer with one laser beam and focus control is performed on the drawing layer with the other laser beam. Show. 2 to 4, the laser beams 20 and 22 are illustrated at positions apart from each other for convenience of explanation, but actually, the laser beams 20 and 22 are emitted coaxially from one objective lens 18.

  2 to 4, the drawing layer has a visible light characteristic that is changed by irradiation with laser light, and is composed of a heat-sensitive material, a photosensitive material, or the like. This drawing layer can be composed of, for example, the same dye material as that of the data recording layer. A wobble groove is formed as a track in the data recording layer. No track is formed in the drawing layer. The arrangement order of the data recording layer and the drawing layer can be either an arrangement in which the data recording layer is closer to the laser incident side or an arrangement in which the drawing layer is closer to the laser incident side. Irradiation of the laser beam to the back layer as viewed from the laser incident side is performed through the near layer. In any of the layer structures of FIGS. 2 to 4, the drawing layer is arranged on the side closer to the direction of viewing the image drawn on the drawing layer with respect to the data recording layer, so that the image can be easily seen.

  The CD standard recordable / drawable type optical disk 12 shown in FIGS. 2 and 3 is formed to have a thickness of 0.6 mm instead of a single 1.2 mm-thick substrate used in a regular CD-R disk. Two substrates are prepared, and these two substrates are bonded to each other with a drawing layer in between. At the time of drawing on the CD standard recording + drawable type optical disk 12, tracking control is performed with the CD laser beam 20, and drawing and focus control are performed with the DVD laser beam 22. On the other hand, the DVD standard recording + drawable type optical disc 12 of FIG. 4 is obtained by additionally forming a drawing layer on a DVD disc. At the time of drawing on the DVD standard recording + drawable optical disk 12, tracking control is performed with the DVD laser beam 22, and drawing and focus control are performed with the CD laser beam 20. Hereinafter, one of the laser beams 20 and 22 used as the tracking control laser beam (first beam) during drawing on the optical disk 12 is referred to as “tracking control laser beam A”, and is used as the drawing and focus control laser beam. The one used (second beam) is referred to as “drawing / focus control laser beam B”. The same reference numerals are used for common parts in FIGS.

Each optical disk 12 of FIGS. 2 to 4 will be described.
<< Example of optical disk layer structure 1: Fig. 2 >>
2 is a first substrate in which a drawing layer 26 and a focusing control semi-transparent reflective layer 28 are sequentially laminated on the surface of a 0.6 mm-thick polycarbonate substrate 24 on which grooves are not formed. 30 and a second substrate 42 in which a data recording layer 36, a focusing control reflective layer 38, and a protective layer 40 are sequentially laminated on the surface of the 0.6 mm thick polycarbonate substrate 32 on which the groove 34 is formed are transparently bonded. The layers 44 are joined to each other to form a whole structure having a thickness of 1.2 mm. At the time of drawing, the laser beam B (22) for drawing / focusing control is controlled to focus on the drawing layer 26. At this time, the tracking control laser beam A (20) is set to a fixed distance that approximates the distance (0.6 mm) between the data recording layer 36 and the drawing layer 26 between the in-focus positions fa and fb. Inevitably, the data recording layer 36 is almost focused. Therefore, at the time of drawing, the optical disk 12 is rotationally driven at a predetermined number of revolutions, and the drawing layer 26 is drawn with the drawing / focus control laser beam B (22) in a state where the tracking control is performed with the tracking control laser beam A (20). Can be drawn. The drawn visible image can be viewed from the laser incident surface 12a side.

<< Layer Structure Example 2 of Optical Disc: Fig. 3>
3 is a modified example of the optical disc 12 in FIG. 2, and is a printing layer in which another image is printed in advance on the outermost protective layer 40 (or printable by the user). 46 is formed by laminating. In other words, a disc manufacturer, a disc seller, a distributor, or the like can print an arbitrary image on the print layer 46 in advance. Alternatively, the print layer 46 can be formed in a plain white color or the like so that the user can print an arbitrary image using a printer or the like. The visible image drawn on the drawing layer 26 is viewed from the laser incident surface 12a side, and the image printed on the printing layer 46 is viewed from the label surface 12b side.

<< Layer Structure Example 3 of Optical Disc: Fig. 4>
The DVD standard recording + drawable type optical disk 12 of FIG. 4 is obtained by additionally forming a drawing layer on DVD-R (+ R). The optical disk 12 includes a first substrate 30 in which a data recording layer 36 and a focusing control translucent reflective layer 28 are sequentially laminated on the surface of a 0.6 mm thick polycarbonate substrate 24 on which grooves 34 are formed, and a 0.6 mm thickness. The second substrate 42 in which the drawing layer 26, the focusing control translucent reflective layer 48, and the protective layer 40 are sequentially laminated on the surface of the polycarbonate substrate 32 on which no groove is formed is bonded to each other by the transparent adhesive layer 44. The whole is formed into an integral structure having a thickness of 1.2 mm. At the time of drawing, the laser beam B (20) for drawing / focusing control is controlled to focus on the drawing layer 26. At this time, the tracking control laser beam A (22) is set to a fixed distance that approximates the distance (0.6 mm) between the data recording layer 36 and the drawing layer 26 between the in-focus positions fa and fb. Inevitably, the data recording layer 36 is almost focused. Therefore, at the time of drawing, the optical disk 12 is rotationally driven at a predetermined number of revolutions, and tracking control is performed on the groove 34 with the tracking control laser beam A (22), and the drawing layer 26 is applied with the drawing / focus control laser beam B (20). Can be drawn. The drawn visible image can be seen from the label surface 12b side through the translucent reflective layer 48.

  Next, a configuration example of the optical system of the optical pickup 16 is shown in FIG. The optical pickup 16 includes a CD laser diode 50 that emits a CD laser light 20 having a wavelength of 780 nm and a DVD laser diode 52 that emits a DVD laser light 22 having a wavelength of 650 nm. The CD laser diode 50 is constituted by a hologram laser with a light receiving element. The CD laser light 20 emitted from the CD laser diode 50 is converted into parallel light (or diverging light close to parallel light) by the collimator lens 54, and then transmitted through the beam splitter 56, and partly by the half mirror 58. The light is reflected, emitted from the objective lens 18 through the quarter-wave plate 60 with a numerical aperture of about 0.45, and irradiated onto the optical disk 12. The numerical aperture of the objective lens 18 with respect to the CD laser light 20 can be set, for example, by adjusting the beam diameter of the CD laser light 20 incident on the objective lens 18. The return light of the CD laser beam 20 reflected by the optical disk 12 is incident from the objective lens 18, partially reflected by the half mirror 58 through the quarter wavelength plate 60, transmitted through the beam splitter 56, and collimator lens 54. And is received by a light receiving element in the CD laser diode 50 (hologram laser with a light receiving element). Based on the light reception signal of the light receiving element, tracking error detection, focus error detection, wobble detection, clock reproduction, recording data demodulation, and the like are performed. The beam splitter 56 is configured such that the upper surface 56a (filter surface) in FIG. 5 is a mirror having wavelength selectivity, and transmits the CD laser beam 20 having a wavelength of 780 nm incident on the surface 56a. And has a characteristic of reflecting the DVD laser beam 22 having a wavelength of 650 nm.

  The DVD laser light 22 emitted from the DVD laser diode 52 passes through the diffraction grating 62, passes through the polarization beam splitter 64, is collimated by the collimator lens 66, is reflected by the beam splitter 56, and is reflected by the half mirror 58. A part of the light is reflected, is emitted from the objective lens 18 with a numerical aperture of about 0.65 coaxially with the CD laser light 20 through the quarter-wave plate 60, and is irradiated onto the optical disk 12. The numerical aperture of the objective lens 18 with respect to the DVD laser light 22 can be set, for example, by adjusting the beam diameter of the DVD laser light 22 incident on the objective lens 18. The in-focus positions of the CD laser beam 20 and the DVD laser beam 22 are arranged in the optical disc 12 at positions shifted from each other in the fixed distance spectral axis direction approximating the distance (0.6 mm) between the data recording layer and the drawing layer. Is done. The return light of the DVD laser light 22 reflected by the optical disc 12 is incident from the objective lens 18, partially reflected by the half mirror 58 through the quarter-wave plate 60, reflected by the beam splitter 56, and collimator lens 66. And is reflected by the polarization beam splitter 64 and is received by the light receiving unit 70 (light receiving element) through the concave lens 68 (detection lens). Tracking error detection, focus error detection, wobble detection, clock reproduction, recording data demodulation, and the like are performed based on the light reception signal of the light receiving unit 70.

The objective lens 18 has an annular diffractive structure (blazed hologram) on its surface 18a, and corrects spherical aberration due to the difference in the substrate thickness between CD and DVD. A method in which the focused positions of the CD laser beam 20 and the DVD laser beam 22 are arranged in the optical disc 12 so as to be separated from each other in the fixed distance spectral axis direction approximating the distance (0.6 mm) between the data recording layer and the drawing layer. For example, the following can be considered.
(A) The hologram on the objective lens surface 18a is designed to act as a concave lens on the CD laser beam 20. Thereby, the in-focus position of the CD laser beam 20 is arranged at a position away from the in-focus position of the DVD laser beam 22.
(B) The collimator lenses 66 and 54 are designed so that the DVD laser 22 is incident on the objective lens 18 as parallel light (infinite optical system) and the CD laser light 20 is incident as divergent light (finite optical system). Deploy. Thereby, the in-focus position of the CD laser beam 20 is arranged at a position away from the in-focus position of the DVD laser beam 22.

  The light receiving element 72 is alternatively used for detecting either one of the laser powers as a front monitor common to the CD laser beam 20 and the DVD laser beam 22. That is, when data recording and reproduction are performed using the CD laser beam 20, a part of the CD laser beam 20 passes through the half mirror 58 and is received by the light receiving element 72. Based on the light reception signal of the light receiving element 72, emission power control by ALPC of the CD laser beam 20 (control of recording power and reproduction power at the time of data recording, and control of reproduction power at the time of data reproduction) is performed. When data recording and reproduction are performed using the DVD laser beam 22, a part of the DVD laser beam 22 passes through the half mirror 58 and is received by the light receiving element 72. Based on the light reception signal of the light receiving element 72, emission power control by ALPC of the DVD laser beam 22 (control of recording power and reproduction power during data recording, and control of reproduction power during data reproduction) is performed.

  At the time of drawing, tracking control is performed with the other laser beam while performing drawing and focus control with one of the laser beam 20 for CD and the laser beam 22 for DVD. Therefore, the laser beam 20 for CD and the laser beam 22 for DVD are simultaneously transmitted. used. However, only one of the light receiving elements 72 is prepared for the front monitor. Therefore, in this embodiment, at the time of drawing, the light-receiving element 72 is used for the drawing / focus control laser beam B, and the emission power control by ALPC {recording power (drawing power) and reproduction power (non-drawing power) control} The tracking control laser light A is set to a fixed current drive that realizes a predetermined reproduction power without performing emission power control by ALPC. Since the tracking control laser beam A only performs tracking, it can function sufficiently even with fixed current drive.

  The focus actuator 74 is driven based on one of the focus error signals as a focus actuator common to the CD laser beam 20 and the DVD laser beam 22 and operates the objective lens 18 in the focus control direction. The tracking actuator 76 is driven based on one of the tracking error signals as a common tracking actuator for the CD laser beam 20 and the DVD laser beam 22, and operates the objective lens 18 in the tracking control direction. Since only one laser beam is used at the time of data recording or reproduction, tracking control and focus control are performed based on the laser beam to be used. At the time of drawing, focus control is performed based on the drawing / focus control laser beam B, and tracking control is performed based on the tracking control laser beam A.

  FIG. 6 shows a configuration example of portions related to focus control, tracking control, and thread feed control in the servo circuit 37 of FIG. The focus control drives the signal selected by the switch 57 out of the focus error signal detected from the return light signal of the CD laser beam 20 and the focus error signal detected from the return light signal of the DVD laser beam 22. The servo loop is configured to supply the circuit 59 and drive the focus actuator 74 by the drive circuit 59 to cancel the focus error.

  The tracking control drives the signal selected by the switch 67 out of the tracking error signal detected from the return optical signal of the CD laser beam 20 and the tracking error signal detected from the return optical signal of the DVD laser beam 22. A servo loop is configured to supply the circuit 69 and drive the tracking actuator 76 by the drive circuit 69 to cancel the tracking error. In the thread feed control, the DC component detection circuit 75 detects the DC component of the tracking error signal selected by the switch 67, and drives the thread feed motor 11 (DC motor) via the drive circuit 77 to cancel the DC component. The servo loop is configured as follows. The switches 57 and 67 in FIG. 6 are switched by the control unit 19 of the signal processing unit 17 (FIG. 1).

  FIG. 7 shows a configuration example of the drive circuit for the CD laser diode 50 and the DVD laser diode 52 (configuration example of the ALPC circuit 39 and the laser driver 27 in FIG. 1). This circuit comprises a CD laser diode drive circuit 78 and a DVD laser diode drive circuit 80, and the front monitor light receiving element 72 is shared by both drive circuits 78 and 80. The switch 82 switches the usage of the light receiving element 72 for the front monitor. When the switch 82 is used for the laser diode drive circuit 78 for CD, it is connected to the contact a, and when it is used for the laser diode drive circuit 80 for DVD, the contact b. Connected to. Since either the CD laser diode 50 or the DVD laser diode 52 is used during data recording or reproduction, the switch 82 is connected to the corresponding drive circuit side. At this time, the drive of the other laser diode is stopped (turned off). At the time of drawing, the switch 82 is connected to the laser light drive circuit side for drawing, and at this time, the laser light drive circuit for tracking control outputs a fixed reproduction (read) power drive voltage. The connection state of the switch 82 and the servo switches 100, 102, 104, and 106 in FIG. 7 is the same as that of the existing DVD-R (+ R) or the DVD-R (+ R) with the drawing layer in FIG. The drawing shows a situation at the time of drawing on a DVD-R (+ R) with a drawing layer (at this time, the CD laser beam 20 constitutes the tracking control laser beam A).

  The CD laser diode driving circuit 78 includes a CD reproducing power driving voltage output circuit 84 for outputting a reproducing power driving voltage and a CD recording power driving voltage output circuit 86 for outputting a recording (write) power driving voltage in parallel. . The DVD laser diode driving circuit 80 includes a DVD reproducing power driving voltage output circuit 88 for outputting a reproducing power driving voltage and a DVD recording power driving voltage output circuit 90 for outputting a recording power driving voltage in parallel. Each drive voltage output circuit 84, 86, 88, 90 includes sample hold circuits 92, 94, 96, 98, servo switches 100, 102, 104, 106, setting devices 111, 113, 115, 117, and amplifier 119. , 121, 123, and 125, respectively.

  The sample hold circuits 92, 94, 96, 98 sample and hold the laser power detected by the front monitor light receiving element 72. The servo switches 100, 102, 104, and 106 turn on and off the servo control system by the drive voltage output circuits 84, 86, 88, and 90, respectively. When the servo loop is formed, the setters 111 and 113 are configured such that the reproduction power command voltage value {voltage value for commanding the target value of the reproduction power (or non-drawing power)} V1 and the recording power command voltage value {recording power (Or voltage value for instructing the target value of (drawing power)} V2 is output. Further, the setting device 111 uses the reproduction power CD laser beam 20 used as the tracking control laser beam A when the DVD-R (+ R) with the drawing layer shown in FIG. 4 is drawn (the servo switch 100 is turned off at this time). Is output as a fixed voltage V1. When the servo loop is formed, the setters 115 and 117 are set such that the reproduction power command voltage value {voltage value for commanding the target value of the reproduction power (or non-drawing power)} V3, the recording power command voltage value {recording power (Or voltage value} V4 for instructing a target value of (or drawing power) is output. Further, the setting unit 115 reproduces the DVD laser beam 22 having a reproduction power used as the tracking control laser beam A when the CD-R with the drawing layer shown in FIGS. 2 and 3 is drawn (the servo switch 104 is turned off at this time). Is output as a fixed voltage V3. The amplifiers 119, 121, 123, and 125 output deviation voltages between the sample hold value and the power command voltage values V1, V2, V3, and V4, respectively, when the servo switches 100, 102, 104, and 106 are on. When the DVD-R (+ R) with a drawing layer in FIG. 4 is drawn (the servo switch 100 is off at this time), the amplifier 119 outputs a fixed voltage V1 as a buffer amplifier. 2 and FIG. 3, when the CD-R with a drawing layer is drawn (servo switch 104 is OFF at this time), the amplifier 123 outputs a fixed voltage V3 as a buffer amplifier.

  The voltage / current converters 131, 133, 135, and 137 convert the voltages output from the drive voltage output circuits 84, 86, 88, and 90 into currents proportional to the voltage values. Switches 127 and 129 are arranged on the output paths of the voltage / current converters 133 and 137, respectively. These switches 127 and 129 are turned on and off in accordance with the signal levels “1” and “0” of the recording pulse or drawing pulse output from the strategy circuit 25, respectively. The adder 139 adds the output currents of the voltage / current converters 131 and 133 to drive the CD laser diode 50. The adder 141 adds the output currents of the voltage / current converters 135 and 137 to drive the DVD laser diode 52.

  Next, an example of the arrangement of pixels constituting one image drawn on the drawing layer of the optical disc 12 will be described. An example of the arrangement of the pixels is schematically shown in FIG. Reference numeral 12 c indicates a center hole of the optical disk 12. Pixels P11, P12,..., P1n, P21, P22,... P2n,..., Pmn constituting one image are tracks on the data recording layer (centered on the center point of the optical disk 12). A wobble groove) is spirally arranged at a track pitch Δr. The arrangement interval (angle) Δθ in the circumferential direction of the pixels is constant, and therefore the number n of pixels per circumference is always constant regardless of the radial position. Since the front and back of the image viewed from the drawing side (laser incident surface 12a side) and the image viewed from the label surface 12b side are reversed, the drawn image is viewed from the label surface 12b side of the optical disk 12 (FIG. In the disc layer structure (4), the original drawing of the image to be drawn is used with the front and back reversed, and is drawn so that the front and back are correctly displayed when viewed from the viewing side (label surface 12b side).

  Drawing with the drawing / focus control laser beam B is performed from the inner circumference side toward the outer circumference side by CAV control of the optical disk 12. That is, at the time of drawing, the spindle motor 14 is CAV-controlled in synchronization with the reference clock, and the pulse generator 31 (FIG. 1) synchronizes with the reference clock to obtain a constant speed (the drawing allocation time per pixel). .., P1n, P21, P22,... P2n,..., Pmn are sequentially drawn at a constant (speed of drawing n pixels per round). Is output. At this time, tracking control is performed on the track of the data recording layer with the tracking control laser beam A, and the positional relationship between the tracking control laser beam A and the drawing / focus control laser beam B is fixed. The radial position moves sequentially in the outer circumferential direction at a track pitch Δr. Since the drawing pulse of each pixel has a duty corresponding to the gradation, drawing by monochrome multi-gradation progresses sequentially. In this way, drawing is continuously performed at a constant speed by n pixels per round and completed in m rounds. As a result, each pixel is drawn at the position shown in FIG. 8 and a corresponding image is displayed on the surface of the optical disc 12.

Control in each operation mode of the optical disc apparatus 10 having the above configuration will be described.
<< When recording data on an existing CD-R or a CD-R with a drawing layer shown in FIGS.
The switches 57 and 67 in FIG. 6 are connected to the CD side. The switch 82 in FIG. 7 is connected to the contact a side. The servo switches 100 and 102 are turned on, and the servo switches 104 and 106 are turned off. As a result, the CD laser diode drive circuit 78 becomes active, and the DVD laser diode drive circuit 80 enters a halt state (the DVD laser diode 52 is off). The switch 127 is turned on / off according to the recording pulse signal levels “1” and “0”. Accordingly, the CD laser diode 50 is driven by a current obtained by adding the output currents of the voltage / current converters 131 and 133 when the recording pulse is “1”, and the voltage / current when the recording pulse is “0”. It is driven only by the output current of the converter 131. At this time, the laser power when the recording pulse detected by the front monitor light receiving element 72 is “1” is sampled and held by the sample hold circuit 94, and the laser power when the recording pulse is “0” is sampled and held by the sample hold circuit 92. Is sampled and held. The amplifier 119 controls the laser power when the recording pulse is “0” to a power corresponding to an appropriate reproduction power command voltage value V 1 set in the setting device 111. The amplifier 121 controls the laser power when the recording pulse is “1” to a power corresponding to an appropriate recording power command voltage value V 2 set in the setting unit 113. Thereby, data recording according to the recording pulse is performed. Focus control and tracking control are performed based on the return light of the CD laser beam 20 when the recording pulse is “0” (that is, at the time of reproduction power). The thread feeding control of the optical pickup 16 is performed based on the DC component of the tracking error signal by the CD laser beam 20. The spindle control is performed by CLV control based on the wobble signal.

<< When reproducing data from an existing CD-R or a CD-R with a drawing layer shown in FIGS.
The switches 57 and 67 in FIG. 6 are connected to the CD side. The switch 82 in FIG. 7 is connected to the contact a side. The servo switch 100 is turned on and the servo switches 102, 104, and 106 are turned off. As a result, the CD laser diode drive circuit 78 becomes active, and the DVD laser diode drive circuit 80 becomes inactive (the DVD laser diode 52 is off). The switches 127 and 129 are always turned off. As a result, the CD laser diode 50 is continuously driven only by the output current of the voltage / current converter 131. At this time, the laser power detected by the front monitor light receiving element 72 is sampled and held by the sample hold circuit 92 at a predetermined cycle. The amplifier 119 controls the laser power to a power corresponding to an appropriate reproduction power command voltage value V1 set in the setting device 111. Thereby, data reproduction is performed. Focus control and tracking control are performed based on the return light of the CD laser beam 20. The thread feeding control of the optical pickup 16 is performed based on the DC component of the tracking error signal by the CD laser beam 20. The spindle control is performed by CLV control based on a wobble signal or a reproduction clock.

<< When recording data on existing DVD-R (+ R) or DVD-R (+ R) with drawing layer in FIG. 4 >>
The switches 57 and 67 in FIG. 6 are each connected to the DVD side. The switch 82 in FIG. 7 is connected to the contact b side. The servo switches 104 and 106 are turned on, and the servo switches 100 and 102 are turned off. As a result, the DVD laser diode drive circuit 80 becomes active, and the CD laser diode drive circuit 78 becomes inactive (the CD laser diode 50 is off). The switch 129 is turned on and off according to the signal level “1” and “0” of the recording pulse. Thus, the DVD laser diode 52 is driven by a current obtained by adding the output currents of the voltage / current converters 135 and 137 when the recording pulse is “1”, and the voltage / current when the recording pulse is “0”. It is driven only by the output current of the converter 135. At this time, the laser power when the recording pulse detected by the front monitor light receiving element 72 is “1” is sample-held by the sample hold circuit 98, and the laser power when the recording pulse is “0” is sample-held circuit 96. Is sampled and held. The amplifier 123 controls the laser power when the recording pulse is “0” to a power corresponding to an appropriate reproduction power command voltage value V 3 set in the setting device 115. The amplifier 125 controls the laser power when the recording pulse is “1” to a power corresponding to an appropriate recording power command voltage value V 4 set in the setting device 117. Thereby, data recording according to the recording pulse is performed. Focus control and tracking control are performed based on the return light of the DVD laser light 22 when the recording pulse is “0” (that is, at the time of reproduction power). The thread feeding control of the optical pickup 16 is performed based on the DC component of the tracking error signal by the DVD laser beam 22. The spindle control is performed by CLV control based on the wobble signal.

<< When reproducing data from existing DVD-R (+ R) or DVD-R (+ R) with drawing layer in FIG.
The switches 57 and 67 in FIG. 6 are each connected to the DVD side. The switch 82 in FIG. 7 is connected to the contact b side. The servo switch 104 is turned on, and the servo switches 100, 102, and 106 are turned off. As a result, the DVD laser diode drive circuit 80 becomes active, and the CD laser diode drive circuit 78 becomes inactive (the CD laser diode 50 is off). The switches 127 and 129 are always turned off. Thus, the DVD laser diode 52 is continuously driven only by the output current of the voltage / current converter 135. At this time, the laser power detected by the front monitor light receiving element 72 is sampled and held by the sample hold circuit 96 at a predetermined cycle. The amplifier 123 controls the laser power to a power corresponding to an appropriate reproduction power command voltage value V3 set in the setting device 115. Thereby, data reproduction is performed. Focus control and tracking control are performed based on the return light of the DVD laser beam 22. The thread feeding control of the optical pickup 16 is performed based on the DC component of the tracking error signal by the DVD laser beam 22. The spindle control is performed by CLV control based on a wobble signal or a reproduction clock.

<< Drawing CD-R with Drawing Layer in FIGS. 2 and 3 >>
The focus control changeover switch 57 in FIG. 6 is connected to the DVD side, and the tracking control changeover switch 67 is connected to the CD side. The switches 57 and 67 in FIG. 6 indicate the connection state at this time. The switch 82 in FIG. 7 is connected to the contact b side. The servo switches 104 and 106 are turned on, and the servo switches 100 and 102 are turned off. The switch 129 is turned on and off according to the signal level “1” and “0” of the drawing pulse. As a result, the DVD laser diode 52 is driven by a current obtained by adding the output currents of the voltage / current converters 135 and 137 when the drawing pulse is “1”, and the voltage / current when the drawing pulse is “0”. It is driven only by the output current of the converter 135. At this time, the laser power when the drawing pulse detected by the front monitor light receiving element 72 is “1” is sample-held by the sample hold circuit 98, and the laser power when the drawing pulse is “0” is sample-held circuit 96. Is sampled and held. The amplifier 123 controls the laser power when the drawing pulse is “0” to a power corresponding to an appropriate reproduction power (non-drawing power) command voltage value V 3 set in the setting unit 115. The amplifier 125 controls the laser power when the drawing pulse is “1” to a power corresponding to an appropriate recording power (drawing power) command voltage value V 4 set in the setting device 117. Thereby, drawing according to a drawing pulse is performed. Focus control is performed based on the return light of the DVD laser beam 22. Further, the CD laser diode drive circuit 78 outputs an appropriate reproduction power command voltage value V1 set in the setting device 111 from the amplifier 119. The CD laser diode 50 is continuously driven with a fixed current corresponding to the reproduction power command voltage value V1, and outputs the CD laser beam 20 with reproduction power. Tracking control is performed by the CD laser beam 20 of this reproduction power. The thread feeding control of the optical pickup 16 is performed based on the DC component of the tracking error signal by the CD laser beam 20. Spindle control is performed by CAV control based on FG pulses.

  The laser power of the drawing / focus control laser beam B (22) and the laser power of the tracking control laser beam A (20) at the time of drawing are as shown in FIGS. That is, the drawing / focus control laser beam B in (a) has a constant drawing allocation time per pixel and a reproduction power (non-drawing power) and a recording power (with a duty corresponding to the gradation data of each pixel). It changes to a binary value of (drawing power). Drawing is performed by changing the visible light characteristics of the drawing layer with the recording power. In addition, a focus error is detected during reproduction power. The tracking control laser beam A in (b) maintains the reproduction power and is used for tracking control.

  The in-focus state at the time of drawing is as shown in FIG. That is, the drawing / focus control laser beam B (22) is focused on the drawing layer 26. On the other hand, the focusing position of the tracking control laser beam A (20) slightly deviates from the data recording layer 36, but since the deviating amount is small, it can be tracked to the groove 34.

<< Drawing DVD-R (+ R) with Drawing Layer in FIG. 4 >>
The focus control changeover switch 57 in FIG. 6 is connected to the CD side, and the tracking control changeover switch 67 is connected to the DVD side. The switch 82 in FIG. 7 is connected to the contact a side. The servo switches 100 and 102 are turned on, and the servo switches 104 and 106 are turned off. As a result, the CD laser diode drive circuit 78 becomes active. The switch 127 is turned on and off in accordance with the signal level “1” and “0” of the drawing pulse. Accordingly, the CD laser diode 50 is driven by a current obtained by adding the output currents of the voltage / current converters 131 and 133 when the drawing pulse is “1”, and the voltage / current when the drawing pulse is “0”. It is driven only by the output current of the converter 131. At this time, the laser power when the drawing pulse detected by the front monitor light receiving element 72 is “1” is sampled and held by the sample hold circuit 94, and the laser power when the drawing pulse is “0” is sampled and held by the sample hold circuit 92. Is sampled and held. The amplifier 119 controls the laser power when the drawing pulse is “0” to a power corresponding to an appropriate reproduction power (non-drawing power) command voltage value V 1 set in the setting device 111. The amplifier 121 controls the laser power when the drawing pulse is “1” to a power corresponding to an appropriate recording power (non-drawing power) command voltage value V 2 set in the setting unit 113. Thereby, drawing according to a drawing pulse is performed. Focus control is performed based on the return light of the CD laser beam 20. Further, the DVD laser diode driving circuit 80 outputs an appropriate reproduction power command voltage value V3 set in the setting device 115 from the amplifier 123. The DVD laser diode 52 is continuously driven with a fixed current corresponding to the reproduction power command voltage value V3, and outputs a DVD laser beam 22 having reproduction power. Tracking control is performed by the DVD laser beam 22 of this reproduction power. The thread feeding control of the optical pickup 16 is performed based on the DC component of the tracking error signal by the DVD laser beam 22. Spindle control is performed by CAV control based on FG pulses.

  The laser power of the drawing / focus control laser beam B (20) and the laser power of the tracking control laser beam A (22) during drawing are the same as those shown in FIGS. 9 (a) and 9 (b). That is, the drawing / focus control laser beam B in (a) has a constant drawing allocation time per pixel and a reproduction power (non-drawing power) and a recording power (with a duty corresponding to the gradation data of each pixel). It changes to a binary value of (drawing power). Drawing is performed by changing the visible light characteristics of the drawing layer at the recording power. In addition, a focus error is detected during reproduction power. The tracking control laser beam A in (b) maintains the reproduction power and is used for tracking control.

  The in-focus state at the time of drawing on the DVD-R (+ R) with the drawing layer is as shown in FIG. That is, the drawing / focus control laser beam B (20) is focused on the drawing layer 26. On the other hand, the focusing position of the tracking control laser beam A (22) slightly deviates from the data recording layer 36, but the amount deviating is small and can be tracked to the groove 34.

  A control procedure at the time of drawing will be described with reference to FIG. This is a case where drawing is performed on the DVD-R (+ R) with the drawing layer with the CD laser beam 20 while performing the focus control with the CD laser beam 20 and the tracking control with the DVD laser beam 22. First, the disk rotational speed at the time of drawing is set, and the spindle motor 14 is CAV controlled to the rotational speed (S1).

  Subsequently, the power of the laser beam is adjusted (S2). That is, first, the DVD laser beam 22 is turned on, the laser power is detected by the front monitor light receiving element 72 (FIG. 7), and the drive current of the DVD laser beam 22 is adjusted so as to obtain a predetermined reproduction power. . When the adjustment is completed, the laser beam 22 for DVD is driven using the driving current in a fixed manner during drawing (that is, without forming a servo loop). When the DVD laser beam 22 is driven at a fixed current, the laser power slightly varies due to a change in ambient temperature during drawing. However, since the DVD laser beam 22 is only used for tracking control, there is no problem (so as to affect the tracking control). Does not change.) Subsequently, the CD laser beam 20 is turned on, the laser power is detected by the front monitor light receiving element 72 (FIG. 7), and predetermined reproduction power (non-drawing power) and recording power (drawing power) are obtained. The drive current of the CD laser beam 20 is adjusted. Drawing is started in this adjusted state, and this servo loop is used during drawing so that the laser power is maintained at the predetermined reproduction power (non-drawing power) and recording power (drawing power) by ALPC control. To do.

  Subsequently, focus servo adjustment (focus bias adjustment) is performed on the CD laser beam 20, and the focus servo is turned on (S3). Then, the optical pickup 16 is moved to the drawing start radial direction position of the optical disk 12 (S4). When the movement is completed, tracking servo adjustment (tracking balance and gain adjustment) is performed on the DVD laser beam 22, and the tracking servo is turned on (S5). Thus, preparation for drawing is completed, and image data is transferred from the host computer 13 to the optical disc apparatus 10 to start drawing (S6). Drawing is performed continuously, and when drawing of the entire image is finished (S7), the control is finished.

  By the way, when drawing on the surface of the optical disk, it is necessary to determine in advance whether the optical disk to be drawn is a disk that can be drawn. An example of the determination method will be described. This is because identification information (drawable disc identification information) indicating that the optical disc is a drawable disc is newly defined and recorded in the data recording layer of the optical disc 12, and the optical disc is inserted into the optical disc apparatus 10 (FIG. 1). When this is done, whether or not the inserted optical disk can be drawn is determined based on whether or not the drawable disk identification information is read by the optical pickup 16.

<< Example of definition of discriminable discriminating information in CD-R with drawing layer >>
The drawable disc identification information can be recorded using an ATIP undefined code recorded in the pregroove of the data recording layer. FIG. 13 shows the data structure of ATIP. With this data structure, “U1” = “1”, and drawable disc identification information can be placed in “U2 to U7”. For example, “U1 to U7” = “1010101” can be defined as drawable disc identification information.

<< Example of definition of discriminable discriminating information on DVD-R (+ R) with drawing layer >>
In the case of DVD-R, drawable disc identification information can be recorded using an undefined code of land pre-pits in the data recording layer. In the case of DVD + R, drawable disc identification information can be recorded using the ADIP undefined code of the data recording layer.

  FIG. 14 shows a drawable disc determination flow by the optical disc apparatus 10 when the drawable disc identification information is recorded on the data recording layer as described above. This control is executed before executing the control shown in FIG. When the optical disk 12 is inserted into the optical disk apparatus 10, the spindle motor 14 is driven to rotate (S10). Next, the optical pickup 16 is transferred to the inner periphery of the disc (the radial position where ATIP information and drawable disc identification information are recorded) (S11). When the inner circumference of the disc is reached, the CD laser beam 20 is turned on with the reproduction power (DVD laser beam 22 is turned off), a focus search is performed, and the layer with the largest focus error amplitude value (this layer is the CD) Focus on the data recording layer (presumed to be the layer at the position of the data recording layer) (S12). When tracking is attempted at the in-focus position (S13) and the tracking is successful (“YES” in S14), the presence / absence of discriminable disc identification information is determined from information read from the track (for example, ATIP information). Is obtained (“YES” in S15), the drawing on the drawing layer by the DVD laser beam 22 is permitted (S16). If the tracking is successful at the in-focus position (“YES” in S14), but the drawable disc identification information is not obtained from the information read from the track (“NO” in S15), it is not a drawable disc. Judgment is made and drawing is prohibited (S22).

  If tracking is not possible at the in-focus position (“NO” in S14. It is estimated that the layer at the in-focus position is a drawing layer without a track), the DVD laser light 22 is turned on with reproduction power (CD laser). The light 20 is turned off), and a focus search is performed to focus on a layer where it is possible to obtain the largest focus error amplitude value (this layer is estimated to be a layer on the data recording layer of the DVD) (S17). When tracking is attempted at the in-focus position (S18) and the tracking is successful (“YES” in S19), the presence / absence of discriminable disc identification information is determined from information read from the track (for example, land pre-pit information, ADIP information). If the identification information is obtained (“YES” in S20), drawing on the drawing layer by the CD laser beam 20 is permitted (S21). If the tracking is successful at the in-focus position (“YES” in S19), but the drawable disc identification information is not obtained from the information read from the track (“NO” in S20), it is not a drawable disc. Judgment is made and drawing is prohibited (S22). Even when tracking is not possible at the in-focus position (“NO” in S19. It is estimated that neither the CD standard disc nor the DVD standard disc is applicable), the drawing is prohibited (S22).

  In the above embodiment, the front monitor light receiving element 72 is shared by the CD laser diode drive circuit 78 and the DVD laser diode drive circuit 80, so that the front monitor light receiving element 72 is drawn and focused at the time of drawing. The control laser beam B is used for ALPC control, and the tracking control laser beam A is driven at a fixed current. The drawing / focus control laser beam B and the tracking control laser beam A are used as a front monitor light receiving element. If an optical pickup mounted individually is used, it is possible to perform drawing while performing ALPC control on both the drawing / focus control laser beam B and the tracking control laser beam A.

  In the above embodiment, the case where the laser beam for CD and the laser beam for DVD are emitted from the optical pickup and the drawing is performed on the CD-R with the drawing layer and the DVD-R (+ R) with the drawing layer has been described. The present invention can be applied to other applications. For example, the present invention can be applied when a CD laser beam and a BD (blue disc) laser beam are emitted from an optical pickup and drawing is performed on a CD-R with a drawing layer and a BD-R with a drawing layer. . Further, the present invention is applied to a case where DVD laser light and BD (blue disc) laser light are emitted from an optical pickup to perform drawing on a DVD-R (+ R) with a drawing layer and a BD-R with a drawing layer. be able to.

1 is a block diagram showing a system configuration of an optical disc apparatus with a drawing function 10 to which the present invention is applied. FIG. 2 is a schematic cross-sectional view showing an example of a layer structure of a CD standard recording + drawable optical disc as a drawable optical disc according to the present invention. FIG. 5 is a schematic cross-sectional view showing a modification of the CD standard recording + drawable optical disk of FIG. 2. FIG. 3 is a schematic cross-sectional view showing an example of a layer structure of a DVD standard recording + drawable optical disc as a drawable optical disc according to the present invention. It is a schematic diagram which shows the structural example of the optical system of the optical pick-up 16 of FIG. FIG. 3 is a block diagram illustrating a configuration example of a portion related to focus control, tracking control, and thread feed control in the servo circuit 37 of FIG. 1. 6 is a block diagram showing a configuration example of a drive circuit (ALPC circuit 39 and laser driver 27 in FIG. 1) for the CD laser diode 50 and the DVD laser diode 52 in FIG. FIG. 2 is a schematic diagram illustrating an example of an arrangement of pixels constituting one image drawn on a drawing layer of the optical disc 12 in FIG. 1. FIG. 5 is a waveform diagram showing the laser power of a drawing / focus control laser beam and the laser power of a tracking control laser beam when drawing on a drawable optical disc according to the present invention. It is a schematic cross section which shows the in-focus state at the time of drawing of CD-R with a drawing layer by this invention. It is a schematic cross section which shows the in-focus state at the time of drawing of DVD-R (+ R) with a drawing layer by this invention. It is a flowchart which shows the control procedure at the time of drawing by the system configuration | structure of FIG. Indicates the data structure of CD-R ATIP 3 is a flowchart showing an example of a drawable disc determination procedure by the optical disc apparatus 10 of FIG. 1 when recording drawable disc identification information on a data recording layer.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Optical disk apparatus (optical disk drawing apparatus) with a drawing function, 12 ... Optical disk, 12a ... Laser incident surface, 12b ... Label surface (surface opposite to beam incident surface), 14 ... Spindle motor, 16 ... Optical pick-up, 18 ... Objective Lens, 20 ... CD laser beam, 19, 37, 39 ... control circuit, 22 ... DVD laser beam, 24 ... first transparent substrate, 26 ... drawing layer, 27 ... laser driver (beam modulation circuit), 28, 48 ... Semi-transparent reflective layer, 32 ... second transparent substrate, 34 ... groove (track), 36 ... data recording layer, 38 ... reflective layer, 46 ... printing layer, 74 ... focus actuator, 76 ... tracking actuator, A ... First beam, B ... second beam, fa, fb ... focus position.

Claims (7)

Using an optical disc in which a data recording layer on which tracks are formed and a drawing layer capable of forming a visible image are laminated,
The first beam and the second beam from one objective lens of the optical pickup are mutually aligned in the fixed distance spectral axis direction in which the in-focus position approximates the interval between the data recording layer and the drawing layer in the optical disc. Shifted so that the focal position of the first beam is disposed on the data recording layer side, and the focal position of the second beam is disposed on the drawing layer side;
With respect to the first beam, the intensity is set to a reproduction power, and tracking control is performed on the track of the data recording layer by the tracking actuator of the objective lens without focus control on the data recording layer,
The intensity of the second beam is modulated according to the image data of the visible image to be formed, and focus control is performed on the drawing layer by the focus actuator of the objective lens. Control to focus state,
An optical disc that performs tracking control on the track of the data recording layer with the first beam and focus control on the drawing layer with the second beam, and forms the visible image on the drawing layer with the second beam. Drawing method. An optical disc drawing apparatus for forming a visible image on the drawing layer of the optical disc using an optical disc in which a data recording layer on which a track is formed and a drawing layer capable of forming a visible image are stacked.
The first beam and the second beam from one objective lens are shifted from each other in the direction of the fixed distance spectral axis in which the in-focus positions of the first beam and the drawing layer approximate the distance between the data recording layer and the drawing layer in the optical disc, An optical pickup that emits light so that a focus position of the first beam is disposed on the data recording layer side and a focus position of the second beam is disposed on the drawing layer side;
The intensity of the first beam is set to reproduction power, and the tracking of the data recording layer is controlled by the tracking actuator of the objective lens without focus control on the data recording layer, and the second beam is controlled. A control circuit that performs focus control on the drawing layer by a focus actuator of the objective lens and controls the drawing layer to a predetermined in-focus state;
A beam modulation circuit that modulates the intensity of the second beam in accordance with image data of a visible image to be formed;
An optical disc that performs tracking control on the track of the data recording layer with the first beam and focus control on the drawing layer with the second beam, and forms the visible image on the drawing layer with the second beam. Drawing device.   A beam driving circuit configured to drive the first beam at a fixed driving value without forming a servo loop and control the beam power of the second beam by forming a servo loop based on the beam power detection; The optical disk drawing apparatus according to claim 2. For an optical disc in which the data recording layer is arranged closer to the laser incident surface than the drawing layer, the beam whose focusing position is closer to the laser incident surface among the beams emitted from the objective lens Are the first beam, and the beam whose in-focus position is far from the laser incident surface constitutes the second beam,
For an optical disc in which the data recording layer is disposed on the side farther from the laser incident surface than the drawing layer, the focused beam out of the beams emitted from the objective lens is the beam farther from the laser incident surface. 4. The optical disk drawing apparatus according to claim 2, wherein the first beam and the beam whose focusing position is closer to the laser incident surface constitute the second beam. 5.   5. The data recording can be performed while performing focus control and tracking control with the first beam on the data recording layer when the visible image is not formed on the drawing layer. An optical disk drawing apparatus according to claim 1. Permitting the drawing operation on the drawing layer on the condition that the identification information indicating that the optical disc has a drawable drawing layer is obtained from the recording information of the data recording layer;
6. The optical disc drawing apparatus according to claim 2, wherein the drawing operation is prohibited when the identification information cannot be acquired from the recording information of the data recording layer.   7. An optical disc having a data recording layer and no drawing layer, wherein data recording can be performed while performing focus control and tracking control with any one of the beams on the data recording layer. The optical disk drawing apparatus described.

Images