JP2006040461A - Optical disk device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily perform label surface printing within the movable range of a conventional objective lens by matching physical standards of a recording type optical disk, mainly a disk structure, optical specifications, and the arrangement of a label layer for recording a visible image. <P>SOLUTION: This optical disk device on which an optical disk having a first recording part for recording information and a second recording part for displaying a visible image is loaded, and which is capable of executing at least one of the recording and the reproducing of information in a first recording part and displaying the visible image in a second recording part is provided with a first light source, a second light source for emitting light having a longer wavelength than that of the first light source, a light receiving means, and an optical member for guiding the light beams emitted from the first and the second light sources to the optical disk and guiding at least a part of light beams reflected from the optical disk to the light receiving means. The visible image is formed in the second recording part of the optical disk by the first light source. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an optical disc apparatus suitably used for a portable electronic device such as a stationary computer such as a personal computer, a notebook personal computer, a portable information terminal device, a portable video device, or a video recording recorder. The present invention relates to an optical disc apparatus capable of recording visible characters and images on a label surface.

  Optical disk devices have become widespread as data playback devices in the computer field and audiovisual equipment field because of the large recording capacity of optical disks and the ease of handling of optical disks. Recently, a recordable optical disc capable of recording various data such as video and music on an optical disc, such as CD-R / RW, DVD-RAM, DVD-R / RW, DVD + R / RW, etc., against the background of the infrastructure of a popular optical disc playback device, Also, the spread of recordable optical disk devices is remarkable. In these recordable optical disc apparatuses, images, music, and the like are recorded by irradiating a recording surface formed in the optical disc surface with laser light.

  As described above, there are several methods for applying the contents recorded on the data recording surface of the optical disc to the optical disc as a visible character or image while the number of recordable optical discs and apparatuses is rapidly increasing. As proposed. One uses a conventional printer device, which has a label surface on the opposite side of the data recording surface of the optical disk and prints directly with a printer head such as an inkjet, or once printed on a sheet-like label by the printer. There are some which are cut out according to the shape of the optical disk and pasted on the label surface of the optical disk (see FIG. 1).

  On the other hand, there are those that record a visible image on an optical disk using a laser mounted on the optical disk device, and those that use the difference in reflectance between the recording part and the non-recording part in the data recording layer of the optical disk ( 2), a photosensitive layer, a heat-sensitive layer, or a sheet (see FIG. 3) having photosensitivity / heat-sensitive characteristics is attached to the label surface of a conventional optical disc, and a visible image is recorded with a laser. Has been.

Examples of the preceding example include (Patent Document 1) (Patent Document 2) (Patent Document 3) and the like.
JP 2003-16650 A JP 2003-203348 A JP 2002-25222 A

  For printing directly on an optical disk by a printer device, it is necessary to prepare a printer device having a path dedicated to the optical disk. In addition, the method of pasting on the optical disk after printing on the sheet is a cumbersome operation when pasting, and the sheet cannot be accurately pasted on the optical disk, which may cause vibration during high-speed playback. . Further, the method of printing on the data recording surface of the optical disc has problems such as sacrificing the data recording capacity and low contrast between the visible image and the data recording material.

  In order to solve these problems, in (Patent Document 2) and (Patent Document 3), a photosensitive / thermosensitive layer that changes color in response to a laser beam mounted on an optical disk device is formed on the surface opposite to the data recording surface of a recordable optical disk. A method of recording on an optical disk provided with a label surface or a label sheet is proposed.

  However, when a visible image is recorded on the label surface of the optical disk as described above, the optical disk is set in the optical disk device in the opposite direction to the case of recording normal information. At that time, the distance from the objective lens at the time of data recording to the data recording layer in the optical disc is different from the distance from the objective lens at the time of visible image recording to the label layer in the optical disc. In order to use laser power effectively, it is necessary to make it close to the normal data recording distance, but depending on the physical standards of various optical discs, the thickness and configuration of the optical disc substrate and cover layer differ, and the objective lens can be adjusted. The range may be exceeded, and it may be difficult to print a visible image. In particular, a thin optical disk device mounted on a notebook personal computer has a limited range of movable adjustment, which has a great influence.

  The present invention solves the above-mentioned conventional problems, and by matching the physical standard of a recordable optical disk, mainly the optical disk structure, optical specifications, and the arrangement of a label layer for recording a visible image, the conventional objective lens The label surface printing is easily realized within the movable range.

  In order to solve the above problems, an optical disk having a first recording unit for recording information and a second recording unit capable of displaying a visible image is mounted, and at least one of information recording and reproduction is performed on the first recording unit. An optical disc apparatus capable of performing a visible image on a second recording unit, wherein the second light source emits light having a wavelength longer than that of the first light source. A light source, a light receiving means, and an optical system member that guides the light emitted from the first light source and the second light source to the optical disk and guides at least a part of the light reflected by the optical disk to the light receiving means, A visible image is formed on the second recording portion of the optical disk with one light source.

  As described above, according to the present invention, when a visible image is recorded on a label surface of an optical disk using a laser mounted on the optical disk device, the laser diode is at least near the surface layer opposite to the data recording surface. A digital signal is output by an optical pickup equipped with an actuator that emits laser light from approximately blue to approximately blue-violet and focuses on the vicinity of the surface layer of an optical disc having a layer of material that changes color in response to the emitted light. By using an optical disk device for recording the optical disk device, it is possible to provide an inexpensive optical disk device with a label printing function while solving the important problem of offset of the objective lens.

  According to a first aspect of the present invention, an optical disc having a first recording unit for recording information and a second recording unit capable of displaying a visible image is mounted, and at least information recording or reproduction is performed on the first recording unit. An optical disc apparatus capable of performing one of them and capable of displaying a visible image on the second recording unit, wherein the first light source and light having a wavelength longer than that of the first light source A second light source that emits light, a light receiving means, and an optical system that guides the light emitted from the first light source and the second light source to the optical disk and guides at least a part of the light reflected by the optical disk to the light receiving means. And forming a visible image on a second recording portion of the optical disk with the first light source, wherein the second recording layer is formed with the short-wavelength first light source. So that a visible image is formed on Possible to increase the A, can short between optical members and the optical disk to form a good image on the second recording unit provided near the surface of the optical disc.

  The invention according to claim 2 is the optical disc apparatus according to claim 1, wherein the first light source emits light having a short wavelength of blue or less, and the first recording portion of the optical disc has a high density. Information recording can be performed, or information can be read out.

The invention according to claims 3 and 4 is the optical disk apparatus according to claim 1, wherein the second light source has a plurality of light sources that emit light having different wavelengths, and more specifically, 4. The optical disk apparatus according to claim 3, wherein the second light source emits at least substantially red light and substantially infrared light. Can emit red light effective for a DVD, and can record and reproduce information on and from various optical disks.

  The invention according to claim 5 is the optical disk apparatus according to claim 4, wherein the second light source is constituted by a monoblock, and light of two different wavelengths is emitted from the monoblock. The device can be downsized rather than provided individually.

  According to a sixth aspect of the present invention, in the first light source, at least one of recording and reproduction of information is performed on the first recording unit of the optical disc and a visible image is formed on the second recording unit of the optical disc. In the light source, the optical disk apparatus according to claim 1, wherein only one of information recording and reproduction is performed on the first recording unit, the NA can be increased, and a distance between the optical system member and the optical disk can be shortened. A good image can be formed on the second recording portion provided near the surface layer of the optical disk.

  According to a seventh aspect of the present invention, there is provided a rotation driving means for rotating an optical disc, a carriage on which at least a first light source, a second light source and an optical system member are mounted and movably held, and a movement as a driving source of the carriage. The optical disk device according to claim 1, further comprising at least one of image formation and information recording / reproduction.

  According to an eighth aspect of the present invention, the optical system member includes an objective lens, the objective lens is held movably within a predetermined range, and the light directed to the optical disk is condensed by the objective lens. The optical disk apparatus according to claim 1, wherein when an image is formed on the second recording portion of the optical disk by the first light source, the image can be formed without increasing the working discance of the objective lens.

(Embodiment 1)
Hereinafter, an optical disk device according to a first embodiment of the present invention will be described with reference to the drawings. 3 is a schematic view and a partial cross-sectional view of an optical disc according to an embodiment of the present invention, FIG. 4 is a schematic cross-sectional view of an optical disc according to various standards according to an embodiment of the present invention, and FIG. 5 is an optical disc according to an embodiment of the present invention. FIG. 6 is a plan view of an optical pickup according to an embodiment of the present invention, FIG. 7 is an overview of an actuator section of the optical pickup according to an embodiment of the present invention, and FIG. 8 is an embodiment of the present invention. FIG. 9 is a schematic cross-sectional view of an optical disc apparatus according to an embodiment of the present invention.

FIG. 3 shows an example of the optical disk 1 and a simplified partial sectional view of a part thereof. In the partial cross-sectional view, the optical disc 1 has a substrate 2 made of a resin such as polycarbonate and a groove (guide groove) 3 shape so that the reflectance changes due to phase change or melting in response to a specific wavelength. From an irreversible data recording layer 4 (first recording portion) that is reversible or unable to rewrite data, a heat dissipation layer 5 that efficiently conducts and dissipates heat at the time of laser irradiation, and a label surface And a label (photosensitive / heat-sensitive) layer 6 (second recording portion) that reacts and develops a color with a specific wavelength, and a label surface cover layer 7 that protects the label layer 6. Further, as the label layer 6, an irreversible write-once that can form an image only once can be used, or an image is formed at a first temperature (wavelength) and the first temperature (wavelength) is formed. And a reversible image that can erase an image formed at a second temperature (wavelength) different from (). The configuration of each layer is schematic, and the thickness of each layer is not as shown in this figure. Further, in this embodiment, an example of a recordable CD disc that is most commercially available among optical discs is taken up, and a recordable DVD disc or the like has a different layer configuration.

  The optical disk 1 records desired digital data after being mounted on the optical disk apparatus. However, in the optical disk apparatus described in the embodiment of the present invention, after data recording, the optical disk 1 is mounted on the optical disk apparatus opposite to the front and back. Visible characters and images can be recorded on the label surface (opposite side of the recording surface) of the optical disk by laser light emitted from a laser diode mounted on the optical pickup of the apparatus. First, the configuration of the optical disc 1 for each optical disc standard will be described, and details of the optical disc device and the optical pickup will be described later.

  FIG. 4 shows an optical disc 1 capable of label recording according to the present invention corresponding to various optical disc standards. The data recording layer and the label recording layer are classified according to each physical standard and are divided into data recording and label recording. A schematic arrangement is shown. Here, a 12 cm diameter optical disc capable of recording data at present, a CD, a DVD, and a short wavelength compatible optical disc (at least one of recording and reproduction of information is performed with light having a wavelength shorter than a blue wavelength). An optical disc that can be used (hereinafter referred to as a short wavelength optical disc) is taken as an example. (A) is the CD standard, (b) is the DVD standard, and (c) is the short wavelength optical disc standard, showing the positional relationship between the data recording layer and the label recording layer.

  In the CD standard disk 1a of (a), as shown in FIG. 3, the laser beam emitted from the objective lens 8 passes through the polycarbonate substrate 2 and is recorded at the innermost position with respect to the objective lens 8. Focus on layer 4a and record data. When viewed from the back side of the data recording layer 4a, that is, from the opposite label surface side, a label layer 6a for recording visible characters and images is disposed near the surface layer. At the time of label recording in the present invention, a desired character or image is recorded with laser light having a focal point set near the surface layer, that is, laser light having a wavelength shorter than the blue wavelength in this embodiment.

  The DVD standard disk 1b of (b) forms a 1.2 mm thick optical disk by laminating two 0.6 mm thick substrates. Therefore, the data recording layer 4b is disposed at a depth of 0.6 mm from the surface of the DVD standard disk 1b. Like the label layer 6a, the label layer 6b in the present embodiment is disposed near the surface layer as viewed from the label surface side. At the time of label recording in the present invention, a desired character or image is recorded with laser light having a focal point set near the surface layer, that is, laser light having a wavelength shorter than the blue wavelength in this embodiment.

  In the short wavelength optical disk 1c of (c), the data recording layer 4c is disposed in the vicinity of approximately 0.1 mm from the disk surface layer. The label layer 6c in the present embodiment is disposed near the surface layer as viewed from the label surface on the opposite side. At the time of label recording in the present invention, a desired character or image is recorded with laser light having a focal point set near the surface layer, that is, laser light having a wavelength shorter than the blue wavelength in this embodiment.

  Here, the position where the label layer 6 of the CD standard disc 1a, the DVD standard disc 1b, and the short wavelength compatible optical disc 1c is disposed is approximately 0.1 mm deep (near the surface layer of the optical disc 1) from the label surface. It is preferable to arrange. That is, by arranging the optical recording medium 4c at the same depth as the data recording layer 4c of the short wavelength compatible optical disc 1c arranged in the vicinity of the surface layer, no special modification or the like is required for the conventional optical pickup, and the short wavelength compatible optical disc data can be easily obtained. With the optical pickup for recording, it is possible to record visible characters and images on the label layer on the CD standard disc 1a, DVD standard disc 1b, and short wavelength compatible optical disc 1c. That is, if the label layer 6 is arranged at the same position as the short wavelength compatible optical disc 1c, the label recording can be easily performed by utilizing the optical system for the short wavelength compatible optical disc 1c for all the standards.

  Here, the data recording layer is a write-once (write-once) optical disc. The data recording layer 4 uses dyes (pigments) that react with laser light, such as cyanine, phthalocyanine, and azo. The recording layer 4 is made of a phase change material such as Ge—Sb—Te or eutectic, and the label layer 6 may be made of the same material as the data recording layer 4, but the contrast is increased. Since it cannot be ensured sufficiently, it is conceivable to use a heat-sensitive material that develops color when heated, such as leuco.

  In FIG. 4, 11 is an optical disk device, 12 is a tray, 13 is a pickup module (hereinafter referred to as PUM) on which an optical pickup 14, a traverse motor 15 and a spindle motor 16 are mounted.

  In normal data recording, after the tray 12 is pulled out from the optical disk device 11, the optical disk 1 is chucked by a spindle motor 16 (not shown) so that the data recording surface 4 of the optical disk 1 and the optical pickup 14 face each other. Attach to. Next, after the tray 12 is stored in the optical disk device 11, the optical disk 1 is controlled to rotate by the spindle motor 16 (in the direction of arrow A), and the optical pickup 14 is rotated in the radial direction of the optical disk (in the direction of arrow B by the traverse motor 15). Direction). When information is recorded on the optical disc 1, laser light is irradiated along the groove 3 (see FIG. 3). Accordingly, when information is recorded, information recording is performed by moving the laser beam irradiated by the optical pickup 14 along the groove 11 on the surface of the polycarbonate substrate 2 of the optical disk 1.

  On the other hand, when a visible image is formed on the surface of the label layer 6 of the optical disc 1, the optical disc 1 is attached to the spindle motor 16 so that the surface on the label surface cover layer 7 side faces the optical pickup 14 of the optical disc apparatus 11. Set in the chucking section (not shown). Then, the optical disc 1 and the optical pickup 14 are controlled by the spindle motor 16 and the traverse motor 15, and a desired visible image is formed on the label layer 6 by irradiating the label layer 6 with a laser beam corresponding to the visible image. To do.

  In FIG. 6, reference numeral 16 denotes a spindle motor for rotating the optical disc 1, and a chucking portion 17 for holding the optical disc 1 is provided. The spindle motor 16 rotates the optical disc 1 at a constant angular velocity or variably rotates the angular velocity. In the present embodiment, the spindle motor 16 is used as the rotation driving means for the optical disc 1, but it may be rotated using another type of motor or another actuator.

  Reference numeral 14 denotes an optical pickup for recording digital information on the optical disc 1 and reading information from the optical disc 1 by irradiating the optical disc 1 with laser light. Reference numeral 18 denotes a carriage serving as a base of the optical pickup 14, and 19 denotes an optical pickup actuator that moves the objective lens 8 substantially three-dimensionally. The carriage 18 is supported by at least a support shaft 20 and a guide shaft 21 and can move between the inner periphery and the outer periphery of the optical disc 1. The carriage 18 includes an optical pickup actuator 19 and an optical unit or a light source (laser diode).

Reference numeral 22 denotes an optical integrated device (for a short wavelength optical disk) including a blue-violet laser unit 22a, a light receiving element unit 22b, and a front light monitoring unit 22c. The laser unit 22a generates laser light having a wavelength of about 405 nm. It has a laser diode. In this embodiment, a laser diode that emits blue-violet light is used. However, a laser diode that emits blue to purple light may be used. As a laser diode for emitting such short-wavelength laser light, an active layer obtained by adding a light emission center such as In to GaN is a p-type layer in which GaN is a main component and p-type impurities are doped, and GaN is mainly used. Those sandwiched between n-type layers doped with n-type impurities as components are preferably used. A so-called nitride semiconductor laser is preferably used.

  Reference numeral 23 denotes a prism directly attached to the laser unit 22a by a technique such as adhesion. The prism 23 transmits the laser beam 24 emitted from the laser diode to irradiate the optical disc 1, and returns the return light from the optical disc 1. It is a prism that leads to the light receiving element portion 22b. The prism 23 is provided with a polymer film for monitoring the laser light 24, and is configured to reflect a part of the laser light 24 to the front light monitor 22c to monitor the output level of the laser light 24. Further, a diffraction grating (not shown) for dividing the laser beam 24 having a wavelength of about 405 nm is further provided at a position led to the light receiving element portion 22b side, and focus detection, tracking detection, spherical aberration detection, and recording on the optical disc 1 are performed. The detected signal and the control signal can be taken out.

  The light receiving element portion 22b is configured to cover the light receiving element and cover the surface with a transparent glass substrate. In addition, a terminal for electrically connecting to the light receiving element is led out from the case on the surface of the case. In addition, it is obvious that the light receiving element 22b in a state in which the light receiving element is covered with a transparent member that does not deteriorate at a wavelength of 405 nm (blue to blue-violet light) is also possible.

  Reference numeral 25 denotes an optical integrated device (for CD / DVD) including a red and infrared laser unit 25b, a light receiving element unit 25a, and a front light monitor 25c. The laser unit 25b includes a laser diode that emits a laser beam having a wavelength of about 660 nm and a laser diode that emits a laser beam having a wavelength of about 780 nm. These laser diodes are arranged in the space of the laser unit 25b. Has been.

  In this embodiment, the laser diodes are arranged in the space as separate light emitter blocks. However, a plurality of light emitting layers are provided in one light emitter block, and one light emitter block is arranged in the space. The structure to do may be sufficient. In this embodiment, two different wavelength laser diodes are mounted, but three or more different wavelength laser diodes may be provided in the space.

  A prism 26 transmits the laser beam 27 and guides the return light to the light receiving element 25a. The prism 26 is provided with a polymer film so that a part of the laser beam 27 is reflected to the front light monitor 25c and the output level of the laser beam 27 can be monitored. Further, a diffraction grating (not shown) that further divides the laser beam having a wavelength of 780 nm is provided at a position led to the light receiving element 25a side, and focus detection, tracking detection, a signal recorded on the optical disc 1, a control signal, etc. Can be detected. The prism 26 is provided with inclined surfaces that are substantially parallel and inclined with each other, and optical elements such as a beam splitter film and a hologram are disposed on the inclined surfaces.

  The light emitted from one of the two laser diodes included in 25b passes through the prism 26 and is guided to the optical disc 1, and the reflected light reflected by the optical disc 1 passes through the prism 26 and is received. It is guided to the element part 25a. At this time, the reflected light from the optical disc 1 in the prism 26 is reflected between two inclined surfaces in the prism and is incident on the light receiving element portion 25a.

  Reference numeral 28 denotes a collimating lens for a wavelength of 405 nm, which is used to make the divergent laser light 24 output from the optical integrated element (for short wavelength compatible optical disk) 22 substantially parallel. The collimator lens 28 also has a function of correcting chromatic aberration that occurs due to the influence of wavelength variation, temperature change, and the like. A beam shaping prism 30 corrects the intensity distribution of the laser light 24 into a substantially circular shape. An aberration correction mirror 31 is used to correct spherical aberration caused by a thickness error of the optical disk 1 or the like.

  A beam splitter 32 separates and combines the laser beam 24 and the laser beam 27 emitted from the optical integrated device (for short wavelength compatible optical disc) 22 and the optical integrated device (for CD / DVD) 25. For this, the phase is also aligned.

  Reference numeral 33 denotes a convex lens, and the laser beam 24 and the laser beam 27 are transmitted through the convex lens 33, then through a rising prism (not shown), and emitted from the objective lens 8 onto the optical disc 1. The objective lens 8 has a wavelength of 390 nm to 430 nm (405 nm in this embodiment) (an optical disc corresponding to a short wavelength), a wavelength of 600 nm to 700 nm (660 nm in this embodiment) (DVD), and a wavelength of 750 nm to 800 nm (in this embodiment). 780 nm) (CD). In the present embodiment, one objective lens 8 corresponding to three wavelengths is described as an example. However, in order to facilitate optical design, it is possible to divide the objective lens into two or more for each wavelength. For example, an objective lens used in a conventional DVD drive shares a wavelength of 660 nm (DVD) and a wavelength of 780 nm (CD), and a dedicated objective lens is used for a short wavelength compatible optical disc that requires a high NA. One objective lens can be driven by one actuator.

  FIG. 7 shows an optical pickup actuator 19 that moves the objective lens 8 of the optical pickup 14 in the vertical direction C and the radial direction D with respect to the optical disc 1. In FIG. 7, the focus actuator 34 is wound in a substantially ring shape, and the tracking actuator 35 is similarly wound in a substantially ring shape. The focus actuator 34 and the tracking actuator 35 are fixed to the objective lens holding member 36 with an adhesive or the like. The magnetic yoke 37 forms a magnetic circuit with the focus magnet 38a and the tracking magnet 38b. The spring substrate 39 is supplied with electric power from a suspension wire 40 having conductivity, and is used as a relay substrate for joining to the objective lens holding member 36. One end of the suspension wire 40 is joined to the spring substrate 39 by solder or the like, and the focus actuator 34 and the tracking actuator 35 are also fixed to the suspension wire 40 by soldering or the like to the spring substrate 39. Further, the spring substrate 39 is fixed to the objective lens holding member 36 with an adhesive or the like. The suspension wire 40 is composed of at least six round wires or leaf springs so that electric power can be supplied to the tracking actuator 35 connected in series with the focus actuator 34. The main configuration of the optical disc apparatus 11 according to the present embodiment has been described above.

Next, FIG. 8 is a block diagram showing the configuration of the optical disc apparatus according to one embodiment of the present invention. As shown in the figure, this optical disk apparatus is connected to a host PC 41, and includes an optical pickup 14, a traverse motor 15, a spindle motor 16, a servo circuit, a CD / DVD decoder / encoder, a CPU, a strategy circuit, FEP (Front End) with built-in PLL (Phase Locked Loop) circuit, ODC (Optical Disk Controller) 42 with built-in buffer memory, RF (Radio Frequency) amplifier, laser power control circuit, etc.
Processor) 43, laser driver 44, and motor driver 45 for traverse and spindle motors.

The spindle motor 16 is a motor that holds and rotates the optical disk 1 that is the target of data recording, and the number of rotations is controlled by a servo circuit. The optical pickup 14 is a unit that irradiates the optical disk 1 rotated by the spindle motor 16 with laser light. In the optical pickup actuator 19 as shown in FIG. 7, the objective lens 8 is held by the focus actuator 34 and the tracking actuator 35 and is perpendicular to the optical disc surface C and the diameter of the optical disc 1 with respect to the opposing optical disc 1. It is movable in the direction D. Each of the focus actuator 34 and the tracking actuator 35 moves the objective lens 8 in the vertical direction C and the radial direction D with respect to the optical disc 1 in accordance with the focus error signal and the tracking error signal supplied from the servo circuit. The servo circuit generates a focus error signal and a tracking error signal based on a light reception signal obtained from the reflected light from the optical disc 1 during laser irradiation, and moves the objective lens 8 as described above to perform focus control and tracking. Take control.

  The RF amplifier (see FIG. 6) amplifies the RF signal supplied from the optical pickup 14, and outputs the amplified RF signal to the ODC 42 incorporating the servo circuit and the decoder. The CD / DVD decoder generates reproduction data by EFM demodulating an RF signal supplied from an RF amplifier during reproduction. The buffer memory is information supplied from the host PC 41 to be recorded on the recording surface of the optical disc 1 (hereinafter referred to as information recording data) and information corresponding to a visible image to be formed on the label surface of the optical disc 1 (hereinafter, visible image). Data). Then, the information recording data stored in the buffer memory is output to the encoder, and the visible image data is output to the control unit. The encoder modulates the recording data supplied from the buffer memory, outputs it to the strategy circuit, performs time axis correction processing on the signal supplied from the encoder, and outputs it to the laser driver 44. The laser driver 44 drives the laser diode of the optical pickup 14 according to a signal modulated according to the recording data supplied from the strategy circuit and the control of the LPC circuit. The LPC circuit built in the FEP 43 controls the laser power emitted from the laser diode of the optical pickup 14. Specifically, the LPC circuit controls the laser driver 44 so that the optical pickup 14 emits laser light having a value that matches the target value of the optimum laser power instructed from the ODC 42. Visible image data supplied from the host PC 41 is sequentially stored in the buffer memory built in the ODC 42 via the CPU. When the host PC 41 creates visible image data to be formed on the label surface of the optical disc 1 in a commonly used bitmap format or the like, the bitmap data is converted into polar coordinate format data, and the converted image data Is transmitted from the host PC 41 to the optical disc apparatus.

  When a visible image is formed on the label surface of the optical disc 1 based on the visible image data supplied as described above, the laser power is a high level recorded by the label layer 6 being discolored and the label layer of the optical disc 1. 6 has a low level at which the light-sensitive and heat-sensitive surfaces hardly change, and the position of the optical pickup 14 can be controlled by always monitoring reflected light or the like. Here, since a method of controlling the position of the optical pickup 14 without using reflected light is also conceivable, the low-level mode may be abolished.

  The traverse motor 15 is a motor for moving the optical pickup 14 in the radial direction D of the optical disc 1. The motor driver 45 drives the traverse motor 15 by an amount corresponding to the signal supplied from the ODC 42. The ODC 42 generates a pulse signal corresponding to the movement amount and the movement direction of the instructed optical pickup 14 according to the movement start instruction including the movement direction and movement amount in the radial direction, and outputs the pulse signal to the motor driver 45. The traverse motor 15 moves the optical pickup 14 in the radial direction of the optical disc 1 and the spindle motor 16 rotates the optical disc 1 to move the laser light irradiation position of the optical pickup 14 to various positions on the optical disc 1. These components constitute the irradiation position adjusting means.

ODC is also CPU (Central Processing Unit) and RAM (Random Access).
Etc., and controls each part of the optical disk apparatus according to a program stored in the ROM, and centralizes the data recording process on the recording surface of the optical disk 1 and the visible image forming process on the heat-sensitive surface of the optical disk 1. It is configured to control.

  Next, the operation of the optical disk apparatus having the above configuration will be described. As described above, this optical disc apparatus can record information such as music / video and PC data supplied from the host PC 41 on the data recording surface of the optical disc 1 and the label layer of the optical disc 1. 6 can form a visible image corresponding to the image data supplied from the host PC 41.

  The operation of the optical disc apparatus capable of performing processing such as information recording and visible image formation will be described below with reference to FIG.

  First, when the optical disc 1 is set in the optical disc apparatus, the optical pickup 14 is controlled to determine whether the surface of the set optical disc 1 facing the optical pickup 14 is a data recording surface or a label surface. In this case, it is conceivable to provide a unique identification mark on the label surface, or simply use the discriminating standard of the existing standard such as CD, DVD, short wavelength optical disc, etc. A method of determining whether or not is possible. In any case, as long as the data recording surface is in opposition to the optical pickup 14, the spindle motor 16 is used in the same manner as a conventional recording type optical disc apparatus in accordance with the standard of the set optical disc 1. The traverse motor 15 is used to drive and control the optical disc 1 and the optical pickup 14. At that time, a laser diode having a wavelength according to each optical disc standard emits light. That is, a 780 nm laser beam for a CD disc, a 650 nm laser beam for a DVD, and a 405 nm laser beam for a short wavelength optical disc are emitted from the respective laser diodes through the objective lens 8. It is focused on the data recording surface of the optical disc 1 (see FIG. 3).

  On the other hand, when the label surface is set to face the optical pickup 14, a laser diode having a wavelength of 405 nm is emitted and focused on the label layer 6 in any standard optical disc. The label layer 6 of the optical disc 1 shown in the present embodiment is disposed in the vicinity of the surface layer (approximately 0.1 mm deep) on the label surface side regardless of the optical disc of any standard. In the short wavelength compatible optical disk standard using a wavelength of 405 nm, since the data recording layer 4 is arranged near the surface layer (approximately 0.1 mm depth) of the optical disk 1, this system (optical pickup actuator 19) is almost as it is. It can be used as a recording system. As shown in FIG. 9, label recording can be performed while driving a conventional actuator. If a system that focuses on the surface layer is not prepared as in the case of the short wavelength optical disc, the objective lens 8 mounted on the optical pickup 14 is opposed to the objective lens 8 as compared with the data recording surface 4. The distance from the label layer 6 of the optical disc 1 is greatly different. The objective lens 8 of the optical pickup 14 is designed so that the laser beam is focused on the data recording layer 4 in consideration of the balance of the weight of the objective lens holding member 36 and the like, and a visible image is displayed on the label layer 6. Setting the optical disc 1 in the optical disc apparatus with the front and back sides reversed when writing will cause the focal position to be offset. Therefore, after the above recognition, it is necessary to automatically adjust the position of the optical pickup 14 and the position of the objective lens 8 in accordance with the optical disc 1 by the following method, and the optical pickup actuator 19 is greatly changed in design. Necessary. In particular, the optical disc apparatus 11 having a small thickness as shown in the embodiment may fail in design.

  The present invention is suitable for use in stationary electronic devices such as personal computers, notebook personal computers, portable information terminal devices, portable electronic devices such as portable video devices, and video recording recorders. It can be applied to an optical disk device that can be formed.

Overview of conventional printer with optical disk label printing function Overview of optical disc with label recorded on optical disc data recording surface of conventional example Overview of optical disc and partial cross-sectional view in an embodiment of the present invention 1 is a schematic cross-sectional view of an optical disc in various standards according to an embodiment of the present invention. Overview of optical disc apparatus according to an embodiment of the present invention 1 is a schematic plan view of an optical pickup according to an embodiment of the present invention. Overview of actuator part of optical pickup in one embodiment of the present invention 1 is a block diagram of an optical disc apparatus according to an embodiment of the present invention. Sectional drawing of the optical disk apparatus in one embodiment of this invention

Explanation of symbols

1 optical disk 2 substrate 3 groove (guide groove)
4 Data Recording Layer 5 Heat Dissipation Layer 6 Label Layer 7 Label Surface Cover Layer 8 Objective Lens 11 Optical Disc Device 12 Tray 13 Optical Pickup Module 14 Optical Pickup 15 Traverse Motor 16 Spindle Motor 17 Chucking Unit 18 Carriage 19 Optical Pickup Actuator 20 Support Shaft 21 Guide shaft 22 Optical integrated device (for short wavelength optical disc)
23 Prism 24 Laser light 25 Integrated optical device (for CD / DVD)
26 prism 27 laser light 28 collimating lens 29 collimating lens 30 beam shaping prism 31 aberration correction mirror 32 beam splitter 33 convex lens 34 focus actuator 35 tracking actuator 36 objective lens holding member 37 magnetic yoke 38a focusing magnet 38b tracking magnet 39 spring substrate 40 suspension wire 41 Host PC
42 ODC
43 FEP
44 Laser driver 45 Motor driver

Claims (8)

An optical disk having a first recording unit for recording information and a second recording unit capable of displaying a visible image is mounted, and at least one of information recording and reproduction can be performed on the first recording unit. In addition, the optical disk apparatus is capable of displaying a visible image on the second recording unit, and includes a first light source, a second light source that emits light having a wavelength longer than that of the first light source, A light receiving unit; and an optical system member that guides light emitted from the first light source and the second light source to the optical disc and guides at least part of the light reflected by the optical disc to the light receiving unit. An optical disc apparatus, wherein a visible image is formed on a second recording portion of the optical disc by using a light source. 2. The optical disc apparatus according to claim 1, wherein the first light source emits light having a short wavelength of blue or less. 2. The optical disc apparatus according to claim 1, wherein the second light source has a plurality of light sources that emit light having different wavelengths. 4. The optical disc apparatus according to claim 3, wherein the second light source emits at least substantially red light and substantially infrared light. 5. The optical disk device according to claim 4, wherein the second light source is formed of a monoblock, and emits light of two different wavelengths from the monoblock. The first light source performs at least one of recording and reproduction of information on the first recording unit of the optical disc and forms a visible image on the second recording unit of the optical disc. The second light source uses the first recording unit. 2. The optical disc apparatus according to claim 1, wherein only one of information recording and reproduction is performed on the unit. A rotation driving means for rotating an optical disk, a carriage on which at least a first light source, a second light source, and an optical system member are mounted and held movably, and a movement driving means that is a driving source of the carriage. 1. The optical disc device according to 1. The optical system member includes an objective lens, the objective lens is held movably within a predetermined range, and the light directed to the optical disk is condensed by the objective lens. Optical disk device.

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