WO2006021897A1 - Systeme pour apposer une inscription sur une etiquette - Google Patents

Systeme pour apposer une inscription sur une etiquette Download PDF

Info

Publication number
WO2006021897A1
WO2006021897A1 PCT/IB2005/052488 IB2005052488W WO2006021897A1 WO 2006021897 A1 WO2006021897 A1 WO 2006021897A1 IB 2005052488 W IB2005052488 W IB 2005052488W WO 2006021897 A1 WO2006021897 A1 WO 2006021897A1
Authority
WO
WIPO (PCT)
Prior art keywords
label
signal
scribing
head
shock
Prior art date
Application number
PCT/IB2005/052488
Other languages
English (en)
Inventor
Jeroen A. L. J. Raaymakers
Original Assignee
Koninklijke Philips Electronics N.V.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Publication of WO2006021897A1 publication Critical patent/WO2006021897A1/fr

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/0045—Recording
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
    • B41J3/407—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for marking on special material
    • B41J3/4071—Printing on disk-shaped media, e.g. CDs
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
    • G11B23/38—Visual features other than those contained in record tracks or represented by sprocket holes the visual signals being auxiliary signals
    • G11B23/40—Identifying or analogous means applied to or incorporated in the record carrier and not intended for visual display simultaneously with the playing-back of the record carrier, e.g. label, leader, photograph

Definitions

  • the invention relates to a device for recording information and scribing a visible label on a record carrier via a beam of radiation, the information being represented by marks in a track on the record carrier, the record carrier having a label side provided with a radiation sensitive layer for creating the visible label, the device comprising a head for providing the beam of radiation for, in a recording mode, generating a scanning spot on the track and for, in a label mode, generating a scribing spot on the radiation sensitive layer for scribing the visible label.
  • the invention further relates to a method of scribing a visible label on a record carrier via a beam of radiation for use in an optical disc device, the record carrier having a label side provided with a radiation sensitive layer for creating the visible label, the device comprising a head for providing the beam of radiation for generating a scribing spot on the radiation sensitive layer for scribing the visible label.
  • the patent application US 2002/0191517 describes an optical disc device and a method of printing a label on an optical disc.
  • the label is created by utilization of a laser beam output from a head of the optical disc device.
  • the word scribing is used for indicating the process of changing the visible light characteristic of a radiation sensitive layer for creating a visible label on a record carrier.
  • the information is stored on a record carrier by writing marks in a track.
  • the optical recording device is equipped with a head to focus a laser beam into a scanning spot on a track on a recording layer of the record carrier.
  • the head is radially positioned on the track via a servo system based on a radial error signal based on detector signals generated from a detector in the head based on radiation reflected from the record carrier.
  • a visible light characteristic changing layer formed from photosensitive or heat-sensitive material is formed in a location which can be viewed from a part of a label surface of an optical disk.
  • the optical disk is set on a turntable of an optical disk unit while the label surface of the optical disk is directed towards an optical head.
  • the optical disk and head are moved mutually to cover a label area along the plane of the optical disk.
  • the power of a laser beam output from the optical pickup is modulated in accordance with image data, such as characters or graphic images to be printed, and the laser beam is emitted onto the visible light characteristic changing layer.
  • image data such as characters or graphic images to be printed
  • the laser beam is emitted onto the visible light characteristic changing layer.
  • a visible-light reflectivity of the visible light characteristic changing layer is changed, thereby forming an image corresponding to the image data on the label surface.
  • a problem of the known system of label scribing is that the printing quality of the label is not constant.
  • a recording device as defined in the opening paragraph, which device comprises a control unit for controlling the recording in the recording mode, the control unit comprising label control means for controlling the scribing in the label mode, and label monitor means for, in the label mode, detecting a shock based on at least one monitor signal from the head, the label monitor means being coupled to the label control means for, if a shock is detected, interrupting the scribing.
  • the object is achieved with a method as defined in the opening paragraph which method comprises the steps of detecting a shock based on at least one monitor signal from the head, and, if a shock is detected, interrupting the scribing.
  • the measures have the effect of detecting a shock during scribing the label.
  • the monitor signal is a signal affected by a mechanical shock and that is derivable from the signals or elements available in the head for optical recording. Due to the shock the head, and subsequently the scribing spot, may be forced to a different location. If so, the label elements will be scribed at that different location while the original location remains blank. Interrupting the scribing, and resuming the scribing at the original location when the shock is over, results in scribing the label elements substantially at their intended location. This has the advantage that a reliable constant quality label is created.
  • the invention is also based on the following recognition.
  • Traditional labeling techniques applied for variably marking optical discs have been based on printing techniques such as ink jet or laser printing, for example described in US 5317337.
  • a label scribing technique is proposed based on a sensitive layer and using the existing optical head in an optical disc device.
  • the known printing techniques arc not aware of the position of the printing head with respect to the object to be printed, i.e. the relative position is not actively detected during printing.
  • the object is mechanically aligned to a known position with respect to a printer device coordinate system, while also the printing head is positioned with respect to the device coordinate system.
  • the label scribing system has the opportunity to actually monitor the mechanical position of the optical head with respect to the object to be printed.
  • the mechanical position may be disturbed due to a mechanical shock, or vibration, etc.
  • the head provides a number of monitor signals, for example detector signals that arc required in an optical disc device for use in the information recording mode, e.g. a focusing or radial tracking detector signal.
  • detector signals that arc required in an optical disc device for use in the information recording mode, e.g. a focusing or radial tracking detector signal.
  • actuators are required for positioning elements in the head, e.g. during said focusing or radial tracking, and may provide back-actuator signals when used as sensor.
  • a back-actuator signal is a signal generated by an actuator when forced into movement, i.e. the actuator functioning as a sensor.
  • a back-EMF signal Electro Magnetic Force: electrical signal generated in a coil moved in a magnetic field
  • the optical head provides various signals that are, in the label mode, surprisingly suitable as monitor signals for detecting a shock.
  • the optical head and detector are necessarily designed to generate a scanning spot via a substrate of known optical properties.
  • the optical elements are designed to compensate a known amount of spherical aberration caused by the substrate.
  • the detector signals for controlling the scanning are designed for following a track in a buried recording layer.
  • the label surface does not have tracks, and the beam does not pass the substrate. Nevertheless the inventors have seen that detector signals occurring while a scribing spot is generated on the flat label sensitive layer can unexpectedly be put to use for detecting mechanical position changes due to shock.
  • shock detection for optical recording is known, for example from US 5675561.
  • the optical recording system has been designed for accurately generating a scanning spot on the track to be followed, and obviously its scanning detector signals will deviate when the track or focus is lost due to a shock. So, during recording, a shock is detected based on variation of the detector signals generated.
  • no track is followed, and commonly printing is performed by only mechanically positioning the printing head and the object to be printed. Hence a label scribing process will not apply techniques from detecting shock or track loss during information recording.
  • the range of dimensions of the marks in the tracks is at least an order of magnitude smaller than visible elements used in printing labels visible for the human eye.
  • the monitor signal comprises at least one detector signal
  • the device comprises a front-end unit coupled to a detector in the head for generating the detector signal based on radiation reflected from the record carrier. This has the advantage that a detector signal required for the optical writing or reading of information is used in the label mode for detecting shock.
  • the monitor signal comprises at least one back-actuator signal
  • the device comprises a back-actuator unit coupled to an actuator in the head for generating the back-actuator signal based on movement of an clement in the head coupled to the actuator.
  • the position of the clement with respect to the head for example the focus position of an optical element, is controlled by the actuator.
  • a back actuator signal is generated by the actuator which then acts as a sensor.
  • the back-actuator unit isolates the generated back-actuator signal.
  • the detector signal comprises a sum reflection signal indicative of the total reflected radiation
  • the label monitor means are for detecting a mechanical shock based on variations of the sum reflection signal.
  • the sum reflection signal on the detector will be relatively high when the scribing spot is focused on the radiation sensitive layer. Hence variations indicate a change in the distance between the relevant optical element(s) in the head and the surface to be printed. This has the advantage that a shock causing a change in distance will be detected and scribing label elements of reduced quality is prevented.
  • the label control means is arranged for interrupting the scribing by the steps of switching the beam of radiation to an intensity which does not affect the radiation sensitive layer, storing a position reference indicative for a radial position and an angular position of the head at the moment of detecting the shock, waiting for the detector signals to resume a normal level, and moving the head to a radial resume position and resuming scribing at an angular resume position according to the position reference. Resuming the scribing at a radial and angular resume position has the advantage that substantially all label elements are scribed to their intended location.
  • the head comprises a tracking optical element coupled to a radial actuator for radially following the track in the recording mode
  • the label monitor means are arranged for, in the label mode, detecting a shock based on a variation of the monitor signal due to a relative movement of the tracking optical element with respect to the head.
  • the radial actuator is used in open loop mode during label scribing, as there is no track and hence no feedback radial servo signal.
  • the tracking optical element for example an objective lens
  • the monitor signal may be a radial detector signal or a signal generated by the radial actuator acting as sensor. This has the advantage that a shock having a radial component is detected. Note that such a shock, when not detected, may cause annular blank or double scribed areas.
  • Fig. Ia shows a disc-shaped record carrier
  • Fig. Ib shows a cross-section taken of the record carrier
  • Fig. Ic shows a label on a record carrier
  • Fig. 2 shows a recording device having label scribing
  • Fig. 3 shows a scanning spots on tracks during recording and a detector
  • Fig. 4 shows shock detecting circuit
  • Fig. 5 shows a method for label scribing and monitoring shocks.
  • Fig. Ia shows a disc-shaped record carrier.
  • a cross-section is shown in Fig. Ib
  • Fig. Ic shows a label side of the record carrier.
  • the record carrier 11 has a track 9 on an information layer and a central hole 10.
  • the track 9 is arranged in accordance with a spiral or concentrical pattern of turns constituting substantially parallel tracks on the information layer.
  • the record carrier may be an optical disc having an information layer of a recordable type. Examples of a recordable disc arc the CD-R and CD-RW, and the DVD-R or DVD+RW, and/or BD (Blu-ray Disc).
  • the track 9 on the recordable type of record carrier is indicated by a pre-embosscd track structure provided during manufacture of the blank record carrier, for example a pregroove.
  • Recorded information is represented on the information layer by optically detectable marks recorded along the track.
  • the marks arc to be read, and optionally written, via a beam of radiation, e.g. a laser beam generated in an optical head in an optical disk drive.
  • the marks are constituted by variations of one or more physical parameters and thereby have different optical properties than their surroundings, e.g. variations in reflection obtained when recording in materials such as dye, alloy or phase change material, or variations in direction of polarization, obtained when recording in magneto-optical material.
  • Fig. Ib shows a cross-section taken along the line b-b of the record carrier 11 of the recordable type, in which a transparent substrate 15 is provided with a recording layer 16 and a protective layer 17.
  • the track structure is constituted, for example, by a pregroove 14 which enables an optical head to follow the track 9 during scanning.
  • the pregroove 14 may be implemented as an indentation or an elevation, or may consist of a material having a different optical property.
  • a track structure may also be formed by regularly spread sub- tracks which periodically cause servo signals to occur.
  • the record carrier may be intended to carry real-time information, for example video or audio information, or other information, such as computer data.
  • a label layer 18 is provided that is sensitive to radiation for scribing a visible label. Scribing is a process of changing the visible light characteristic of the radiation sensitive layer 18 for creating the visible label.
  • Fig. Ic shows a label on a record carrier.
  • the record carrier 11 is shown from the label side, and a visual label 19 has been scribed in the radiation sensitive layer.
  • the visual label elements e.g. black dots, are scribed in the label layer 18 by applying a scribing spot and scanning the label layer in radial and angular position while modulating the power of the beam of radiation.
  • a system for scribing visible labels is for example known from US 2002/0191517 as mentioned in the introduction.
  • the examples are based on a record carrier that has the radiation sensitive label layer on a different side of the record carrier then the entry side for recording and reading information.
  • a label layer of a suitable material may be located at the entry side.
  • Such a label layer has to be at least partly transparent to the radiation for recording and reading information from the marks in the track.
  • the label layer may only be applied to a part of the label side. Obviously label elements can only be scribed at the covered part.
  • Fig. 2 shows a recording device having label scribing.
  • the device is provided with means for scanning a track on a record carrier 11, which means include a drive unit 21 for rotating the record carrier 1 1, a head 22, a servo unit 25 for positioning the head 22 on the track and a control unit 20.
  • the head 22, also called OPU (Optical Pickup Unit), comprises an optical system of a known type for generating a radiation beam 24 guided through optical elements focused to a radiation spot 23 on a track of the information layer of the record carrier.
  • the radiation beam 24 is generated by a radiation source, e.g. a laser diode.
  • the head further comprises (not shown) a focusing actuator for focusing the beam to the radiation spot on the track by moving the focus of the radiation beam 24 along the optical axis of said beam, and a tracking actuator for fine positioning of the spot 23 in a radial direction on the center of the track.
  • the tracking actuator may comprise coils for radially moving an optical element for following the track.
  • the radiation reflected by the information layer is detected by a detector of a usual type in the head 22.
  • Fig. 3 shows scanning spots on tracks during recording and a detector.
  • Fig. 3 A shows a scanning spot 35 named C centered on a track 9, and two satellite spots A,B positioned halfway between two further tracks 9 in a data recording mode.
  • the spots are on the radiation sensitive label layer, and are also heavily deformed due to spherical aberration, which aberration is present in the optical system to compensate for the substrate to be passed in data mode.
  • Fig. 3B shows a detector having a four-quadrant part 36 having four subdetectors A+B+C+D for the radiation from scanning spot C.
  • a first extra detector 37, divided in halves E+F, for the radiation from the satellite spot A and a second extra detector 38, divided in halves G+H, for the radiation from the satellite spot B are arranged in the track direction as indicated by the arrow. Due to the optical system radial push-pull signals may be derived from the A+B+C+D, E+F and G+H subdetectors. It is noted that in label mode the image on the detectors is also deformed by said spherical aberration, and detector signals of individual subdetectors are not easily usable for focusing, etc.
  • a front-end unit 31 is coupled to the detector in the head 22 for providing detector signals based on radiation reflected from the track.
  • the detector signals may include a main scanning signal 33 for reading the marks and sub-detector signals, for example a push-pull sub-detector signal based on the radiation as reflected from a left and right side of the track respectively and/or a satellite sub-detector signal based on the radiation as reflected from separate satellite spots positioned to the left and right side of the center of the track as shown in Fig. 3.
  • Detector signals for tracking and focusing 35 are coupled to the servo unit 25 for controlling said tracking and focusing actuators.
  • the main scanning signal 33 is processed by read processing unit 30 of a usual type including a demodulator, dcformattcr and output unit to retrieve the information.
  • the control unit 20 controls the recording and retrieving of information and may be arranged for receiving commands from a user or from a host computer.
  • the control unit 20 is connected via control lines 26, e.g. a system bus, to the other units in the device.
  • the control unit 20 comprises control circuitry, for example a microprocessor, a program memory and interfaces for performing the procedures and functions as described below.
  • the control unit 20 may also be implemented as a state machine in logic circuits.
  • the device is provided with recording means for recording information on record carriers of a writable or re-writable type.
  • the recording means cooperate with the head 22 and front-end unit 31 for generating a write beam of radiation, and comprise write processing means for processing the input information to generate a write signal to drive the head 22, which write processing means comprise an input unit 27, a formatter 28 and a modulator 29.
  • write processing means comprise an input unit 27, a formatter 28 and a modulator 29.
  • the power of the beam of radiation is controlled by modulator 29 to create the optically detectable marks in the recording layer.
  • the input unit 27 comprises compression means for input signals such as analog audio and/or video, or digital uncompressed audio/video. Suitable compression means are described for video in the MPEG standards, MPEG-I is defined in ISO/IEC 11172 and MPEG-2 is defined in ISO/IEC 13818. The input signal may alternatively be already encoded according to such standards.
  • the device has two modes of operation, a recording mode for conventionally recording optical discs as described above, and a label mode.
  • the control unit 20 is for controlling the recording in the recording mode.
  • the control unit comprises a label control unit 33 for controlling the scribing in the label mode.
  • the record carrier In the label mode the record carrier is to be entered in the device with its label side towards the optical head to allow the beam of radiation to be focused to a scribing spot on the radiation sensitive layer.
  • the user may give a command to engage the label mode.
  • the device may automatically detect if a suitable record carrier for label write has been entered, for example by detecting prescribed marks on a predefined location on the record carrier.
  • the idea in label mode is to print labels at the non-data side of a CD or DVD disc.
  • a CD laser in the optical head may be used to write the label.
  • the head and scribing spot positioning in radial direction is performed by an open loop control, because no tracks or position information such as addresses are available. Focus control is based on maximizing reflected radiation. A result of the lack of feedback would be that a shock is not detected and scribing proceeds off-track. This will deteriorate picture quality.
  • the device is provided with a label monitor 32 for, in the label mode, detecting a shock based on monitor signals from the head.
  • the label monitor 32 is coupled to the label control unit 33 for, if a mechanical shock is detected, interrupting the scribing. Variations in any of the monitor signals, or a combination thereof, may be used to detect a shock.
  • Suitable filtering e.g. low-pass filters or delay units, may be added to prevent variations due to other causes, such as a slight scratch on the surface of the record carrier, to be misjudged for a shock.
  • the monitor signals are detector signals from the front-end unit 31 based on radiation reflected from the record carrier.
  • a suitable signal or combination of signals from the detector is applied as monitor signal in the label mode.
  • the variation in the detector signals may be a variation in a push-pull signal based on sub- detector elements of the detector in the label mode.
  • the push-pull signal is provided for controlling the radial actuator.
  • the variation in the detector signals may also be a variation in the satellite signal(s) based on sub-detector elements of the detector for satellite spots in the label mode.
  • the satellite signal In the recording mode the satellite signal may be used for controlling the radial actuator.
  • the same signals are used to detect the beamlanding differences caused by shock.
  • the monitor signal is a back-actuator signal.
  • a back-actuator signal is a signal generated by an actuator when forced into movement, i.e. the actuator functioning as a sensor.
  • a back-EMF signal Electro Magnetic Force: electrical signal generated in a coil moved in a magnetic field
  • the device is now provided with a back-actuator unit 34 coupled to an actuator in the head for generating the back-actuator signal based on movement of an element in the head coupled to the actuator.
  • the back-actuator unit 34 is accommodated in the servo unit 25 and has a detector circuit for separating the back-actuator signals from control signals being sent to control the actuator.
  • the control output of the serve drive amplifier may be disabled, or at least isolated to some extent, from the actuator.
  • the output of the back-actuator unit 34 is coupled to the label monitor 32 for detecting deviations of the back-actuator signals. It is noted that the back EMF signal may separately be used to provide additional damping to the respective actuator/element assembly.
  • the EMF signal of an electro-magnetic actuator is directly related to the velocity of its coils with respect to the magnet. As a result the EMF signal can be used to provide a velocity control loop to generate the additional damping.
  • a system with EMF damping consists of the back-actuator unit 34 to measure the back EMF and a controller (e.g. of the PI - Proportional - Integrating type) to feed back the EMF signal into the actuator.
  • the EMF signal can be used to detect a velocity change with respect to the sctpoint velocity of a feedforward loop.
  • EMF damping and/or EMF detection can be used in both focus and radial actuator systems, and that the sctpoint for radial velocity may be zero during scribing circles of dots, whereas the setpoint for focusing may be based on a detected distance to the record carrier.
  • the differences of a back-actuator signal with respect to a setpoint may be detected by a circuit as described below with reference to Fig. 4, a threshold detector in such circuit being arranged to detect if the absolute difference of the back-actuator signal exceeds the threshold.
  • the detector signals include a sum reflection signal indicative of the total reflected radiation.
  • the main scanning signal may be used, usually called central aperture signal (CA), or a combination of all sub- detector signals.
  • CA central aperture signal
  • the label monitor 32 monitors the level of the sum signal for detecting a mechanical shock based on variations of the sum reflection signal, e.g. a dip to less the 80% of the average level.
  • the label monitor 32 takes different levels of the reflected energy into account that are caused by the variation of the power of the beam of radiation.
  • a write reflection level is caused by scribing a label element, e.g. a black dot.
  • the label monitor detects said variations of the sum reflection signal only during scribing the radiation sensitive layer as a reduction with respect to the write reflection level of the sum reflection signal.
  • a so-called read reflection level is caused by setting the power of the laser beam to a low level in between writing label elements.
  • the label monitor detects said variations of the sum reflection signal in between scribing the radiation sensitive layer as a reduction with respect to the read reflection level of the sum reflection signal.
  • Fig. 4 shows shock detecting circuit.
  • the circuit provides an embodiment for the label monitor 32.
  • An input sum signal 41 for example the CA signal, is coupled to a first low-pass filter 43, for example a FIR (Finite Impulse Response) filter, to generate a filtered scribe signal 46, and to a second low-pass filter 44 to generate a filtered read signal 47.
  • the filtered scribe signal 46 is input for a first level detector 48 that compares the input to a write- level threshold that sets the minimum level of the filtered sum signal during scribing.
  • the filtered read signal 47 is input for a second level detector 49 that compares the input to a read- level threshold that sets the minimum level of the filtered sum signal during reading.
  • a DATA signal 42 provides the timing for read or scribe by enabling the first low-pass filter 43 and the first level detector 48 during scribing, respectively via an inverter 45 enabling the second low-pass filter 44 and the second level detector 49 during reading.
  • the first level detector 48 detects a reduction of the input a first interrupt signal 50 is generated, and correspondingly when the second level detector 49 detects a reduction of the input below the threshold a second interrupt signal 51 is generated. Both interrupt signals are coupled to the label control unit 33 for immediately interrupting the label scribe process.
  • the shock detecting circuit functions as follows. Based on the
  • DATA signal 45 only one branch of a low-pass filter and level comparator is active. The other branch is put on hold, so the delay elements in the low-pass filter are not set to zero, but are simply held to their current value.
  • a separate threshold level is programmed in each branch. The threshold levels can be adjusted based on a simple calibration at the start of the recording. In this calibration the filtered read and write signals are sampled. The thresholds are set to a fraction of the measurements, for example 80%. The circuit in Fig. 4 runs at a high sample rate.
  • the threshold levels may be updated dynamically, e.g. a low pass filter with a large time constant (typical 5 seconds) operating on the filtered sum signals can be used to update the threshold levels.
  • the time constant is much larger then the time constant of the low-pass filter.
  • the threshold levels may be made dependent on the radial and/or angular position of the scribing spot on the disc. For example the reflection is measured and stored at a number of angular positions during a rotation, and the threshold is controlled in dependence of the actual angular position.
  • radial detector signals are applied for detecting shock.
  • the head 22 comprises a tracking optical element coupled to the radial actuator for radially following the track in the recording mode, for example the objective lens.
  • the label monitor 32 is arranged for, in the label mode, detecting a shock based on a variation of the detector signals due to a relative movement of the tracking optical element with respect to the detector in the head.
  • the head itself is located on a sledge for coarse radial movement. Note that in label scribe mode, the radial position is constant during the scribing itself, i.e. a circle of dots is formed. After scribing a circle, a fixed voltage is applied to the radial actuator, for scribing an adjacent circle.
  • the sledge is moved in a coarse step, and the radial actuator voltage is adapted correspondingly for the next circle.
  • the radial actuator is moved by a preset voltage step to achieve a pitch of 15 ⁇ between adjacent circles of scribed dots, and a sledge carrying the head is moved at steps of about 150 ⁇ .
  • a combined detector signal that represents radial beam landing of the spot on the detector is proposed as fast shock detection signal. Beam landing indicates the way in which the reflected energy is divided over the various sub-detectors.
  • a one spot push-pull signal (as generated for use during normal recording) can be used as a good shock detection signal in label scribe mode.
  • the push-pull signal should be substantially constant during label scribe, because a constant beam landing offset is caused by the constant actuator voltage during scribing a circle of dots.
  • the satellite detector signals can be used.
  • the satellite detector signals may be combined with other sub- detector signals to provide a clean beamlanding signal and compensate push-pull modulation by tracks in data recording mode; and such a beamlanding signal may also be used in label mode for shock detection.
  • the detector signals may be normalized with the total reflection signal, comparable with conventional tracking or focus error signal generation during recording mode.
  • the radial error signals such as the push-pull signal do substantially vary due to beamlanding differences, although the scribing spot is deformed by spherical aberration due to the lack of a substrate in between the optical elements in the head and the label layer.
  • the label control unit 33 is arranged for interrupting the scribing when an interrupt signal is generated by the label monitor 32. The following steps arc performed. First power of the beam of radiation is switched to an intensity which does not affect the radiation sensitive layer. This may be zero intensity.
  • a low intensity may be preferred for being able to keep using and monitoring the detector signals.
  • Such positions may be based on accurately controlling and measuring the rotation of the record carrier and the radial displacement of the head from a known reference position.
  • the record carrier may have additional marks on the label side, such as a barcode.
  • the angular position may be based on signals from a Hall sensor coupled to a turntable motor, as described in a co-pending application of the current applicant
  • the radial displacement may be based on a stepping motor for equal sized, numbered, steps, or may be based on a rotation sensor coupled to a motor for moving the sledge along a spindle.
  • a position reference is stored in a buffer memory that contains the measured radial position and angular position.
  • the detector signals are assumed to resume a normal level, for example a predefined period such as 500 ms, or a period in dependence of an amount of shock detected Alternatively the levels may be monitored during the waiting, and the waiting may be terminated as soon as a normal level is detected.
  • the head is moved to a radial resume position based on the radial position stored in the position reference, and scribing is resumed at an angular resume position according to the angular position indicated in the position reference.
  • the label control unit 33 is arranged for compensating a detection delay of the shock. Due to the filtering, level detecting and interrupt signal handling a certain delay has occurred from the time the shock arrived until the time that the radial and angular positions are measured. Hence the disturbing effect started before those positions, and an angle margin is subtracted from the measured angular position. Now the angular resume position is based on the stored angular position of the head at the moment of detecting the shock minus an angle margin, and scribing will start earlier. Note that in general no significant degradation of the label is caused by scribing the same data again at the right locations, while a blank area may disturb the visual label.
  • Fig. 5 shows a method for label scribing and monitoring shocks.
  • the method is for use in an optical disc device for scribing a visible label on a record carrier via a beam of radiation.
  • the device has a head for providing the beam of radiation for generating a scribing spot on the radiation sensitive layer for scribing the visible label, and a front-end unit coupled to a detector in the head for generating detector signals based on radiation reflected from the record carrier.
  • the method starts at START 60, and in step INSERT 61 a record carrier is inserted having a label side provided with a radiation sensitive layer for creating the visible label.
  • step LABEL_M0D 62 the device is switched to label mode by detecting the label layer or by a user command.
  • step RECEIVE 63 label data to be scribed in the sensitive layer are received. In practice all label data may be received first and stored locally, or label data may be received in batches from a host computer or via a network. Label data may for example be downloaded from a website.
  • step SCRIBE 64 the head is moved to a radial position where the label data needs to be scribed, and the record carrier is rotated until the angular rotational position has been reached. Subsequently the laser power is controlled according to the label data and the head is moved as described above for forming the label.
  • a step SHOCK 65 the detector signals are monitored for the occurrence of a shock as described above. The monitoring takes place in parallel to the process of label scribing. If a shock is detected in step SHOCK 65 the power of the laser is switched to a low level in step LOW POWER 70. Subsequently the position of the head at the time of the interruption is detected, and stored temporarily in step STORE 71. Next a waiting time is applied in step WAIT 72, for example a predetermined time of 500 ms or a period until the detector signals are stable again. After the waiting time, in step RESUME 73, the head is moved to the stored radial position.
  • the laser power is resumed at the high power for scribing according to the label data in step SCRIBE 64.
  • the angular resume position may include an angle margin before the stored position to be sure to resume writing before the effect of shock may have caused the beam to deviate from the intended location. If no shock is detected in step LAST 66 it is detected if the label is complete. If more data is awaited, the process continues at step receive, other wise the label scribe process is complete at END 67.
  • the invention has been mainly explained by embodiments using optical discs having a label layer, the invention is also suitable for other record carriers such as rectangular optical cards, magneto-optical discs or any other type of information storage system that applies record carriers scanned via a beam of radiation.
  • the word 'comprising' does not exclude the presence of other elements or steps than those listed and the word 'a' or 'an' preceding an element docs not exclude the presence of a plurality of such elements, that any reference signs do not limit the scope of the claims, that the invention may be implemented by means of both hardware and software, and that several 'means' or 'units' may be represented by the same item of hardware or software.
  • the scope of the invention is not limited to the embodiments, and the invention lies in each and every novel feature or combination of features described above.

Landscapes

  • Optical Recording Or Reproduction (AREA)

Abstract

L'invention concerne un dispositif de disque optique et un procédé permettant d'apposer une inscription sur une étiquette visible, sur un support d'enregistrement, par l'intermédiaire d'un faisceau de rayonnements. Un support d'enregistrement comporte une face d'étiquette munie d'une couche sensible aux rayonnements, pour créer une étiquette visible. Ledit dispositif comporte une tête pour fournir le faisceau et une unité frontale couplée à un détecteur dans la tête, pour produire des signaux de détection, sur la base des rayonnements réfléchis par le support d'enregistrement. Selon ledit procédé, il est prévu de détecter (65) un impact du dispositif, sur la base des signaux de contrôle provenant de la tête, puis, si un impact est détecter, d'interrompre l'inscription, par commutation du laser, à faible puissance (70), de mémoriser la position (71) de l'interruption, d'attendre jusqu'à ce que les signaux de détection soient stables et de reprendre l'inscription (73).
PCT/IB2005/052488 2004-08-23 2005-07-25 Systeme pour apposer une inscription sur une etiquette WO2006021897A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP04104044 2004-08-23
EP04104044.5 2004-08-23

Publications (1)

Publication Number Publication Date
WO2006021897A1 true WO2006021897A1 (fr) 2006-03-02

Family

ID=35355132

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2005/052488 WO2006021897A1 (fr) 2004-08-23 2005-07-25 Systeme pour apposer une inscription sur une etiquette

Country Status (2)

Country Link
CN (1) CN101015006A (fr)
WO (1) WO2006021897A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1717798A2 (fr) * 2005-04-26 2006-11-02 Hitachi-LG Data Storage Korea Inc. Procédé d'enregistrement pour le dispositif de disque optique
EP1742218A2 (fr) * 2005-06-30 2007-01-10 Yamaha Corporation Formation d'une image visible sur un disque optique par faisceau laser
EP1845522A2 (fr) * 2006-04-13 2007-10-17 Yamaha Corporation Procédé de dessin d'image de disque optique, programme de dessin d'image de disque optique et système de dessin d'image de disque optique

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001006214A (ja) * 1999-06-21 2001-01-12 Mitsubishi Chemicals Corp 光記録媒体
US20040001411A1 (en) * 2002-06-27 2004-01-01 Yamaha Corporation Optical disc recording apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001006214A (ja) * 1999-06-21 2001-01-12 Mitsubishi Chemicals Corp 光記録媒体
US20040001411A1 (en) * 2002-06-27 2004-01-01 Yamaha Corporation Optical disc recording apparatus

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 16 8 May 2001 (2001-05-08) *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1717798A2 (fr) * 2005-04-26 2006-11-02 Hitachi-LG Data Storage Korea Inc. Procédé d'enregistrement pour le dispositif de disque optique
EP1717798A3 (fr) * 2005-04-26 2007-10-31 Hitachi-LG Data Storage Korea Inc. Procédé d'enregistrement pour le dispositif de disque optique
US7728864B2 (en) 2005-04-26 2010-06-01 Hitachi-Lg Data Storage Korea, Inc. Recording method for optical disc device
EP1742218A2 (fr) * 2005-06-30 2007-01-10 Yamaha Corporation Formation d'une image visible sur un disque optique par faisceau laser
EP1742218A3 (fr) * 2005-06-30 2009-06-10 Yamaha Corporation Formation d'une image visible sur un disque optique par faisceau laser
US7649816B2 (en) 2005-06-30 2010-01-19 Yamaha Corporation Optical disk recording system for recording visible images capable of handling “buffer under run” errors
EP1845522A2 (fr) * 2006-04-13 2007-10-17 Yamaha Corporation Procédé de dessin d'image de disque optique, programme de dessin d'image de disque optique et système de dessin d'image de disque optique
EP1845522A3 (fr) * 2006-04-13 2007-11-21 Yamaha Corporation Procédé de dessin d'image de disque optique, programme de dessin d'image de disque optique et système de dessin d'image de disque optique
US7623146B2 (en) 2006-04-13 2009-11-24 Yamaha Corporation Optical disc image drawing method, optical disc image drawing program, and optical disc image drawing system

Also Published As

Publication number Publication date
CN101015006A (zh) 2007-08-08

Similar Documents

Publication Publication Date Title
EP1784821B1 (fr) Systeme de rainurage d'une etiquette visible
US20060227680A1 (en) Focus servo control method in optical disc device
WO2006021897A1 (fr) Systeme pour apposer une inscription sur une etiquette
EP2290648B1 (fr) Lentille d'objectif et capture optique comprenant la lentille d'objectif
US7336569B2 (en) Optical disk tracking servo circuit enabled to compensate for non-continuous track segments or prolonged defect
US7688339B2 (en) System for scribing a visible label
EP1705648B1 (fr) Procédé de servocommande de la focalisation dans un dispositif de disque optique
US20050195718A1 (en) Method for controlling rotating speed of disc
JP2006031893A (ja) 光ディスク装置
US7257069B2 (en) Optical storage device and optical device
EP0568009B1 (fr) Appareil d'enregistrement et procédure pour un disque magnéto-optique
US20050265211A1 (en) Optical disk and optical disk apparatus
US20080151723A1 (en) Apparatus and Method for Reading and/or Writing Information and Method for Controlling a Stepping Motor
US20050265208A1 (en) Optical disk, optical disk apparatus, and method of optimizing focus
US20080316877A1 (en) Control Method for an Optical Drive with Different Bandwidths
EP0326343A2 (fr) Appareil optique d'enregistrement d'information
US20080259749A1 (en) Recovery of Lost Track Focusing on an Optical Disc
US7570550B2 (en) Focus servo recovery processing method for optical disc device and optical disc device
JP2005317104A (ja) 光ディスク装置
EP1784823A1 (fr) Commande de mise au point d'un systeme de balayage de milieux
US20080205230A1 (en) Speed-Down During Linking
KR20080032837A (ko) 고밀도 다층 디스크에 대한 층간 포커스 제어 장치 및 방법
JP2004171688A (ja) 欠陥検出方法、欠陥検出回路及び光ディスク駆動装置
JP2011034671A (ja) 光ディスク装置
JP2001283452A (ja) 光磁気ヘッド

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KM KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NG NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SM SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): BW GH GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LT LU LV MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase