Source: http://www.google.com/patents/US6314066?dq=6011510
Timestamp: 2015-01-25 21:00:52
Document Index: 200489269

Matched Legal Cases: ['art 118', 'art 119', 'arts 107', 'art 118', 'art 119', 'art 201', 'art 203', 'art 107', 'art 106', 'art 201', 'art 402', 'art 403', 'art 404', 'art 402', 'art 404', 'art 405', 'art 405', 'art 402', 'art 201', 'art 201']

Patent US6314066 - Method for controlling track jump in optical recording medium - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsMethod for controlling track jump in an optical recording medium for writing/reading data on/from land/groove tracks having depths different from each other in a direction of a beam incident, including the steps of (1) adjusting an offset of a servo error signal generated by using an optical signal reflected...http://www.google.com/patents/US6314066?utm_source=gb-gplus-sharePatent US6314066 - Method for controlling track jump in optical recording mediumAdvanced Patent SearchPublication numberUS6314066 B1Publication typeGrantApplication numberUS 09/621,628Publication dateNov 6, 2001Filing dateJul 21, 2000Priority dateJul 21, 1999Fee statusPaidPublication number09621628, 621628, US 6314066 B1, US 6314066B1, US-B1-6314066, US6314066 B1, US6314066B1InventorsSeong Pyo Hong, Sang On Park, Hyung Jin JeonOriginal AssigneeLg Electronics Inc.Export CitationBiBTeX, EndNote, RefManPatent Citations (3), Referenced by (19), Classifications (11), Legal Events (7) External Links: USPTO, USPTO Assignment, EspacenetMethod for controlling track jump in optical recording mediumUS 6314066 B1Abstract Method for controlling track jump in an optical recording medium for writing/reading data on/from land/groove tracks having depths different from each other in a direction of a beam incident, including the steps of (1) adjusting an offset of a servo error signal generated by using an optical signal reflected at the optical recording medium consistent to the land track, (2) adjusting an offset of a servo error signal generated by using an optical signal reflected at the optical recording medium consistent to the groove track, (3) selecting the servo error signal having the offset adjusted consistent to the land/groove track in the step (1) or (2) in response to a land/groove switching signal, (4) receiving a track jump command, and determining the track jump command of being an �N�(�N� is an odd numeral) track jump command, and (5) if the track jump command is determined of being an �N�(�N� is an odd numeral) track jump command in the step (4), after switching the land/groove switching signal and carrying out an �N� track jump, carrying out servo by using a servo error signal selected in response to the land/groove switching signal in the step (3).
(1) adjusting an offset of a servo error signal generated by using an optical signal reflected at the optical recording medium consistent to the land track; (2) adjusting an offset of a servo error signal generated by using an optical signal reflected at the optical recording medium consistent to the groove track; (3) selecting the servo error signal having the offset adjusted consistent to the land/groove track in the step (1) or (2) in response to a land/groove switching signal; (4) receiving a track jump command, and determining the track jump command of being an �N�(�N� is an odd numeral) track jump command; and, (5) if the track jump command is determined of being an �N�(�N� is an odd numeral) track jump command in the step (4), after switching the land/groove switching signal and carrying out an �N� track jump, carrying out servo by using a servo error signal selected in response to the land/groove switching signal in the step (3). 2. A method as claimed in claim 1, wherein, when the �N�(�N� is an odd numeral) track jump command is received in the vicinity of a land/groove switching section, switching of the land/groove is waited, and if switching of the land/groove switching signal is made by the land/groove switching, the �N� track jump is carried out after the land/groove switching signal is switched again.
(1) adjusting an offset of a servo error signal generated by using an optical signal reflected at the optical recording medium consistent to the land track; (2) adjusting an offset of a servo error signal generated by using an optical signal reflected at the optical recording medium consistent to the groove track; (3) selecting the servo error signal having the offset adjusted consistent to the land/groove track in the step (1) or (2) in response to a land/groove switching signal; (4) receiving a track jump command, and determining the track jump command of being an �N�(�N� is an odd numeral) track jump command; (5) if the track jump command is determined of being an �N�(�N� is an odd numeral) track jump command in the step (4), determining that whether the �N� track jump command is generated in the vicinity of the land/groove switching section or not; (6) if it is determined that the �N� track jump command is not generated in the vicinity of the land/groove switching section in the step (5), switching the land/groove switching signal, carrying out the �N� track jump, and operating a servo in response to the servo error signal selected according to the land/groove switching signal in the step (3); and, (7) if it is determined that the �N� track jump command is generated in the vicinity of the land/groove switching section in the step (5), waiting for the lang/groove switching, and, once the land/groove switching signal is switched by the land/groove switching, switching the land/groove switching signal again, carrying out the �N� track jump, and operating a servo in response to the servo error signal selected according to the switched land/groove switching signal. 11. A method as claimed in claim 10, wherein the land/groove switching section is detected by counting a number of pre-formatted headers between writeable data regions for marking the data regions.
In general, an optical recording medium system, i.e., an optical disk recording/reproducing device is a device for reading a data recorded on an optical disk, such as CD (Compact Disk) or DVD(Digital Versatile Disc), or writing the data on the optical disk. Of the rewritable optical disk in the optical disk, there are CD-RW(Rewritable Compact Disc), and Rewritable Digital Versatile Discs(DVD�RW, DVD-RAM, DVD+RW). Particularly, the DVD-RAM has signal tracks of lands and grooves, to write or read data to/from tracks, not only of lands or grooves, but also tracks both of lands and grooves.
FIG. 1 illustrates a block diagram of a related art recording/reproducing device such a DVD-RAM, wherein, under the control of the servo controller 113, an optical pickup 102 directs a beam focused by an objective lens onto the signal track of the optical disk 101, or directs a beam, reflected at a signal recording surface and focused again by the objective lens, toward an optical detector for detecting a focus error signal and a tracking error signal. The optical detector has a plurality of optical detecting elements each for forwarding an electric signal proportional to an optical quantity of light incident thereto to a RF and servo error generator 103. As shown in FIG. 2, if the optical detector has a particular number of divisions, i.e., four divisions in a signal track direction and in a radial direction of the optical disk 101, four optical detecting elements PDA, PDB, PDC, and PDD, the optical detector forwards electrical signals �a�, �b�, �c�, and �d� proportional to quantities of lights obtained at respective optical detecting elements PDA, PDB, PDC, and PDD to the RF and servo error generator 103. The RF and servo error generator 103 combines the electrical signals �a�, �b�, �c�, and �d�, to produce a RF signal (or a read channel 1 signal) required for data reproduction, a read channel 2 signal required for servo control, and a focus error signal. The RF signal can be obtained by (a+b+c+d) of the electrical signals from the optical detector, the read channel 2 signal can be obtained by (a+d)−(b+c) of the electrical signals from the optical detector, and the tracking error TE signal can be obtained by processing the read channel 2 signal. If the optical detector has two division in the track direction, the RF signal (=I1+I2) and the read channel 2 signal (=I1-I2) can be detected from balances of quantities of lights. That is, �a�+�d� in FIG. 2 corresponds to I1, and �b�+�c� corresponds to I2. In this instance, in a case of a rewritable disk 101, it is impossible to control and write on the disk because the disk has no information. For this, by forming disk tracks on the lands and the grooves, writing information along the tracks, and writing control information on sector addresses, random accesses, and rotation control separately, the tracking control can be made even for an empty disk having no information signal recorded thereon. The control information may be written by pre-formatting a header region at beginning of every sector. In a case of the DVD-RAM, the head region pre-formatted at beginning of every sector is provided with four header fields(a header 1 field�header 4 field) again. The header 1, and 2 fields and the header 3 and 4 fields are formed to alternate with reference to a track center, one example of which is illustrated in FIG. 3 wherein a configuration of a header field for the first sector of one track is shown.
FIGS. 4A�4C illustrate waveforms showing a process of generating the L/G switching signal L/Gsw of L/G switching in a regular servo, i.e., in regular writing/reading. That is, the read channel 2 signals detected in the header 1, 2 fields and the header 3, 4 fields have opposite phases (i.e., slopes) because the header region, i.e., the header 1, 2 fields and the header 3, 4 fields are arranged to alternate with reference to a track center. Therefore, if the read channel 2 signal is sliced at a preset slice level, the IP1 and the IP2 can be detected. For example, if it is assumed that the slice level is set to the track center, and the IP1 signal is generated if the read channel 2 signal is higher than the slice level, and the IP2 signal is generated if the read channel 2 signal is lower than the slice level, phases of the IP1 signal and the IP2 signal will be changed depending on the track tracking at the present time of being the land or the groove. Dependent on the land/groove track, either the IP1 signal or the IP2 signal comes the first. Therefore, as shown in FIG. 4A, the L/G determining part 118 determines a front and a rear of the IP1 and IP2 signals detected at every header position, to invert ipLG signal as shown in FIG. 4B, and the L/G switching signal forwarding part 119 inverts the L/G switching signal L/Gsw as shown in FIG. 4C and forwards to a microcomputer 116 and the L/G selecting parts 107 and 112 if the ipLG signal is switched. That is, the L/G determining part 118 determines the optical pickup 102 of tracking the land track or the groove track with reference to the IP1 and IP2 signals, and forwards a relevant signal ipLG, and the L/G switching signal forwarding part 119 forwards a signal L/Gsw for controlling the optical pickup 102 to track the land track or the groove track.
The description until now is on regular servo, i.e., regular writing/reading in an L/G structured DVD-RAM. If the foregoing method is applied to a track jump in the DVD-RAM, there can be a problem. That is, in a case of the L/G structured DVD-RAM, if odd numbers of track jumps inclusive of one track jump, for example, track jumps of land→groove, or groove→land are done, a land and groove inversion is occurred, to require the L/G switching. However, in the track jump, detection of the read channel 2 signal is poor because the turned off tracking servo causes the servo unstable, that results in poor detection of the IP1 and IP2 signals too, to fail proper generation of the ipLG signal. The improper ipLG signal may switch the L/G switching signal LGsw at a section which is not a L/G switching time point. And, if the offset is not exact due to this, a defocus or detrack may occur, in which the focus or the tracking servo does not follow a desired track. And, if no L/G switching is made in the odd number track jump, with the L/G signal having a previous value as it was, the defocus, or the detrack is occurred, in which the tracking servo does not follow a desired track, but to a track at a side of the desired track because the offsets are not exact. That is, in a jump of land→groove track, the focusing, and tracking may follow, not a groove track, but a land track, and, opposite to this, in a jump of groove→land track, the focusing and tracking may follow, not a land track, but a groove track. Particularly, if the foregoing related art is used in one track jump in an optical disk, such as the DVD-RAM data writing/reading both on/in land/groove of which is permitted as it is, there is a possibility of occurrence of two track jump. That is, provided that one track jump command is given, the servo controller 113 generates a kick pulse (or a jump pulse) in a state only the focus servo is turned on, and provides a track driving voltage TAO proportional to the kick pulse to a tracking actuator through an F/T servo driver 114 as shown in FIG. 5C. When the track driving voltage TAO proportional to the kick pulse is provided, an object lens of the tracking actuator is pushed in a direction of track jump by an acceleration as a speed of the tracking actuator is increased. In this instance, the tracking error signal makes an �S� curve as shown in FIG. 5A. And, as shown in FIG. 5B, a TZC(Track Zero Crossing) signal turned on/off at a zero cross time point of the tracking error signal TE rises at a zero cross position of the tracking error signal. When the TZC signal rises, the servo controller 113 applies brake pulses to the actuator for a preset brake time period, to drop a speed of the actuator. That is, the tracking actuator is accelerated by the kick pulse until the brake pulse is generated when the tracking actuator is decelerated. Being inverted pulses of the kick pulses, the brake pulses are generated for stable and exact stopping of the actuator at a desired position. And, at an end of the preset brake time period, the tracking servo and a sled servo are turned on, to complete the track jump.
SUMMARY OF THE INVENTION Accordingly, the present invention is directed to a method for controlling track jump in an optical recording medium that substantially obviates one or more of the problems due to limitations and disadvantages of the related art.
To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described, the method for controlling track jump in an optical recording medium for writing/reading data on/from land/groove tracks having depths different from each other in a direction of a beam incident, includes the steps of (1) adjusting an offset of a servo error signal generated by using an optical signal reflected at the optical recording medium consistent to the land track, (2) adjusting an offset of a servo error signal generated by using an optical signal reflected at the optical recording medium consistent to the groove track, (3) selecting the servo error signal having the offset adjusted consistent to the land/groove track in the step (1) or (2) in response to a land/groove switching signal, (4) receiving a track jump command, and determining the track jump command of being an �N�(�N� is an odd numeral) track jump command, and (5) if the track jump command is determined of being an �N�(�N� is an odd numeral) track jump command in the step (4), after switching the land/groove switching signal and carrying out an �N� track jump, carrying out servo by using a servo error signal selected in response to the land/groove switching signal in the step (3).
When the �N�(�N� is an odd numeral) track jump command is received in the vicinity of a land/groove switching section, switching of the land/groove is waited, and if switching of the land/groove switching signal is made by the land/groove switching, the �N� track jump is carried out after the land/groove switching signal is switched again.
In another aspect of the present invention, there is provided a method for controlling track jump in an optical recording medium for writing/reading data on/from land/groove tracks having depths different from each other in a direction of a beam incident, including the steps of (1) adjusting an offset of a servo error signal generated by using an optical signal reflected at the optical recording medium consistent to the land track, (2) adjusting an offset of a servo error signal generated by using an optical signal reflected at the optical recording medium consistent to the groove track, (3) selecting the servo error signal having the offset adjusted consistent to the land/groove track in the step (1) or (2) in response to a land/groove switching signal, (4) receiving a track jump command, and determining the track jump command of being an �N�(�N� is an odd numeral) track jump command, (5) if the track jump command is determined of being an �N�(�N� is an odd numeral) track jump command in the step (4), determining that whether the �N� track jump command is generated in the vicinity of the land/groove switching section or not, (6) if it is determined that the �N� track jump command is not generated in the vicinity of the land/groove switching section in the step (5), switching the land/groove switching signal, carrying out the �N� track jump, and operating a servo in response to the servo error signal selected according to the land/groove switching signal in the step (3), and (7) if it is determined that the �N� track jump command is generated in the vicinity of the land/groove switching section in the step (5), waiting for the lang/groove switching, and, once the land/groove switching signal is switched by the land/groove switching, switching the land/groove switching signal again, carrying out the �N� track jump, and operating a servo in response to the servo error signal selected according to the switched land/groove switching signal.
FIGS. 4A�4C illustrate timing diagrams showing relations of a header, an ipLG, and L/Gsw signals for land/groove switching in a regular tracking;
FIGS. 5A�5C illustrate timing diagrams showing a related art one track jump process;
FIGS. 8A�8D illustrate timing diagrams showing relations of trkjmp, trkkmp_edge, ipLG, and L/Gsw signals for land/groove switching in an N(N is an odd number) track jump in FIG. 6;
FIGS. 9A�9D illustrate timing diagrams showing relations of trkjmp, trkkmp_edge, ipLG, and L/Gsw signals for land/groove switching when a track jump command is produced in the vicinity of a land/groove switching section in FIG. 6;
FIGS. 11A�11F illustrate timing diagrams showing the one track jump process in FIG. 10.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. FIG. 6 illustrates a block diagram of a device for recording/reproducing a data on/from a rewritable optical disk in accordance with a preferred embodiment of the present invention, of which L/G switching signal generator 200 and microcomputer 116 only are different from the system shown in FIG. 1. That is, the L/G switching signal generator 200 includes an L/G determining part 201 for determining a land and a groove by using IP1 and IP2 signals detected from a read channel 2 signal, a track jump edge detector 202 for detecting an edge of a track jump signal trkjmp received from the microcomputer 116, and an L/G switching signal forwarding part 203 for forced switching of the L/G switching signal upon detection of the edge of the track jump signal.
FIG. 7 illustrates a flow chart showing a method for controlling a track jump in accordance with a preferred embodiment of the present invention. In the present invention, if N is an odd numeral in making an N track jump, the L/G switching signal is switched forcibly, and if N is even numeral, a previous value is maintained as it was. That is, if N is an odd numeral, a track jump of land→groove, or groove→land track is made, L/G switching is required. Therefore, upon reception of the track jump command, the microcomputer 116 identifies a number of tracks to be jumped, i.e., the �N�, and determines the �N� of being an odd numeral. (step 301). If the number of tracks to be jumped is an odd numeral, it is determined that the track jump command is occurred in the vicinity of the L/G switching section. (step 302). If it is determined in the step 302 that the track jump command is not occurred in the vicinity of the L/G switching section, as shown in FIG. 8A, a trkjmp signal is provided to the track jump edge detector 202 for an L/G switching. (step 303). Upon reception of the trkjmp signal, the track jump edge detector 202 detects a rising edge of the trkjmp signal, and generates a trkjmp_edge signal at the rising edge for one clock as shown in FIG. 8. (step 304). In the present invention, for the sake of convenience of explanation, it is assumed that the track jump is made from a groove track to a land track. The opposite case is applicable in the same fashion. In this instance, when the trkjmp_edge signal is generated, the L/G switching signal generator 203 inverts the L/G switching signal L/Gsw at the moment right away as shown in FIG. 8C. (step 305). FIG. 8C illustrates a state in which the L/G switching signal L/Gsw is switched from a groove to a land when the trkjmp_edge signal is generated. Accordingly, the L/G selecting part 107 or 112 selects a focus error signal and an inverted tracking error signal having an offset adjusted consistent to the land track at the land offset part 106 or 110 and the invertor 111 under the control of the toggled L/G switching signal L/Gsw. However, the optical pickup 102 is not switched from the groove to the land yet, the L/G determining part 201 determines the present signal track being a groove track according to determination of an order of the IP1 and IP2 signals. Therefore, the ipLG signal is maintained in a state the same as before as shown in FIG. 8D.
Referring to FIG. 10, the servo controller includes a track DSP(Digital Signal Processor) filter 401 for passing the tracking error signal occurred in a regular writing/reading, a first TZC generating part 402 for generating the tracking zero cross signal turned on/off at a zero cross time point of the tracking error signal, a TE differential signal generating part 403 for differentiating the tracking error signal upon reception of the one track jump command, a second TZC generating part 404 for generating the tracking zero cross signal turned on/off at a zero cross time point of the differentiated tracking error signal, and a TAO controller 405 for controlling a driving voltage TAO of a tracking actuator with reference to the first and second TZC signals. FIGS. 11A�11F illustrate timing diagrams showing the one track jump process when the present track is a groove, and when the present track is a land, the one track jump is made in a state the signals are inverted from the signals in FIG. 11 except the track driving voltage. In FIG. 10 having the foregoing system, the optical pickup 102 directs a beam focused onto the object lens onto a signal track of the optical disk 101, or directs a beam, reflected at a signal recording surface and incident thereto, to the optical detector for detection of the focus error signal and the tracking error signal after focusing the beam onto the object lens again. As shown in FIG. 2, the optical detector has a plurality of optical detecting elements, for forwarding an electrical signal proportional to quantities of lights obtained at the optical detecting elements to the RF and servo error generator 103. The RF and servo error generator 103 detects the RF signal for reading the data, the focus error signal FE and the tracking error signal TE for servo control, and the like, from the electrical signal from the optical detector. If it is a regular writing/reading process, the tracking error signal generated at the RF and servo error generator 103 is converted into the track driving voltage TAO through the DSP filter 401, provided to the F/T servo driver 114, and a regular writing/reading is carried out, when the tracking servo is in a turned on state.
In the meantime, if the one track jump command is received, the servo controller 113 generates kick pulses (or called as jump pulses) in a state only the focus servo is turned on, and provides the track driving voltage TAO proportional to the kick pulses to the tracking actuator through the tracking F/T servo driver 114. That is, when the kick pulses are provided, the object lens of the tracking actuator is pushed toward a track jump direction by an acceleration as a speed of the tracking actuator rises. In this instance, the first TZC generating part 402 generates the signal to be turned on/off at a zero cross time point of the tracking error signal TE, and, as shown in FIG. 11B, the generated TZC signal rises at a zero cross position of the tracking error signal TE. In the meantime, the TE differential signal generating part 404 differentiates the tracking error signal as shown in FIG. 11A generated upon reception of the one track jump command into a signal as shown in FIG. 11C, and forwards to the second TZC generating part 405. The second TZC generating part 405 generates a DTZC(Differential TZC signal) to be turned on/off at a zero cross time point of the differentiated tracking error signal DTE. That is, the DTZC signal rises at a zero cross of the DTE(Differentiated Tracking Error signal) as shown in FIG. 11D. In this instance, for conducting the one track jump, a generating time point of the brake pulses and a brake time point should be fixed after the kick pulses are received, which is carried out at the TAO controller 403. As one embodiment in a disk like the DVD-RAM, the TAO controller 403 generates the brake pulses to start the braking operation at or after a rising time point of the DTZC as shown in FIG. 11E in the case of the one track jump. That is, when the track driving voltage TAO proportional to the brake pulses is provided to the tracking actuator as shown in FIG. 11E, speed of the tracking actuator being accelerated by the kick pulses is dropped. Then, when a preset brake time comes, the tracking servo and the sled servo are turned on, and, in the present invention, the brake time is set until a rising time point of the TZC signal produced from the tracking error signal before the differentiation as shown in FIG. 11B. That is, as shown in FIGS. 11E and 11F, by switching the lang/groove, and turning on the tracking servo and the sled servo at a rising time point of the TZC signal, the one track jump is completed. The process until now is a case when the present invention is applied to a disk data can be written/read both on/from land/groove, and, if the data can be written/read only on/from land or groove, identical to the related art, the TZC signal generated at the first TZC generating part 402 is used as a control signal of the one track jump. In the meantime, in a case when the track jump command is generated in the vicinity of an L/G switching section, as the section is an L/G switching section from the starting, a forced switching of the L/G switching signal L/Gsw in addition to the original L/G switching may cause wrong tracking. The L/G switching section can be known by counting a number of headers. In this case, therefore, switching of the L/G switching signal L/Gsw is waited until an end of the L/G switching section, and if once the switching of the L/G switching signal L/Gsw is occurred, the L/G switching signal L/Gsw is forcibly switched in the next header section. In this instance, the vicinity of the L/G switching section may be set from a header position right before the L/G switching section to the L/G switching section, for example, may be set from a header position 2�3 sectors right before the L/G switching section. That is, if it is determined in the step 302 that the �N�(�N� is an odd number) track jump command is received in the vicinity of the L/G switching section, the microcomputer 116 provides the trkjmp signal to the track jump edge detector 202 as shown in FIG.10A. (step 308). However, the track jump edge detector 202 provides no trkjmp_edge signal until the end of L/G switching (step 309). That is, the previous state is maintained. In this instance, as phases of the IP1, IP2 signals are switched once the L/G switching section is passed, the L/G determining part 201 switches the ipLG signal into a high state as shown in FIG. 9C. (Step 310). Determining that the L/G is switched once the ipLG signal is switched, the L/G switching signal generator switches the L/G switching signal L/Gsw to a high state as shown in FIG. 9D. (Step 311). In the meantime, when the L/G switching section ends and one sector section passes, the track jump edge detector 202 generates trk_edge signal as shown in FIG. 9B and forwards to the L/G switching signal generator 203. (step 312). Upon reception of the trkjmp_edge signal, the L/G switching signal generator 203 switches the L/G switching signal L/Gsw into a low state. (Step 313). When the L/G switching signal L/Gsw is switched into a low state, the servo controller 113 carries out an �N� track jump (step 314), and when the �N� track jump is carried out, the L/G determining part 201 switches the ipLG signal into a low state as shown in FIG. 9C. (Step 315). Therefore, even if the track jump command is generated in the vicinity of the L/G switching section, the focus and tracking servos can be placed on a desired track safely after the track jump. Thus, the present invention permits that the focus and tracking servos can be placed on a desired track even after a track jump, by making a forced switching of the L/G switching signal L/G sw before carrying out the track jump when an odd number track jump is required.
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS4866688 *Dec 17, 1986Sep 12, 1989Hitachi, Ltd.Composite tracking servo system for optical disc apparatus with track offset correctionUS5892740 *May 18, 1998Apr 6, 1999Mitsubishi Denki Kabushiki KaishaOptical disk drive and optical disk having address pits for sectors in land and groove tracksUS5982722 *May 17, 1995Nov 9, 1999Sony CorporationTracking servo apparatus for carrying out tracking by eliminating an offset component from an output signal and method therefor* Cited by examinerReferenced byCiting PatentFiling datePublication dateApplicantTitleUS6501714 *Nov 24, 1999Dec 31, 2002Sanyo Electric Co., Ltd.Method and apparatus for controlling track jumpUS6621773 *Mar 7, 2001Sep 16, 2003Via Technologies, Inc.Glitch protection method in optical storage deviceUS6822935 *Sep 15, 2000Nov 23, 2004Lg Electronics Inc.Track discriminating apparatus and method for optical recording mediumUS6975565 *Aug 30, 2000Dec 13, 2005Sanyo Electric Co., Ltd.Disk apparatusUS7242655Oct 4, 2004Jul 10, 2007Lg Electronics Inc.Track discriminating apparatus and method for optical recording mediumUS7411583 *Sep 27, 2004Aug 12, 2008Palm, Inc.Optical sensor based user interface for a portable electronic deviceUS7468935 *Jun 5, 2003Dec 23, 2008Thomson LicensingOptimized tracking methodUS7646681Dec 1, 2003Jan 12, 2010Samsung Electronics Co., Ltd.Method of automatically pausing optical pickup in DVD-RAM disc driveUS7663996May 4, 2004Feb 16, 2010Thomson LicensingTrack jumping for optical recording mediaUS7684286Aug 31, 2005Mar 23, 2010Mediatek Inc.Track-jump control device and method thereofUS7843776Aug 8, 2006Nov 30, 2010Hitachi, Ltd.Optical disk recording/reproducing apparatus and seek control method thereofUS7924661Jun 4, 2009Apr 12, 2011Mediatek Inc.Track-jump control system and method for maintaining track-jump stabilityUS8121000 *May 10, 2010Feb 21, 2012Hitachi Media Electronics Co., Ltd.Optical disk apparatusUS8634281 *Mar 2, 2012Jan 21, 2014Hitachi-Lg Data Storage, Inc.Optical disc deviceUS20120230171 *Mar 2, 2012Sep 13, 2012Hitachi Consumer Electronics Co., Ltd.Optical disc deviceCN100501842CJun 5, 2003Jun 17, 2009汤姆森特许公司Optimized tracking methodCN101527145BOct 10, 2006Jun 22, 2011日立乐金资料储存股份有限公司Optical disk recording/reproducing apparatus and seek control method thereofEP1475790A1 *Mar 17, 2004Nov 10, 2004Thomson Licensing S.A.Track jumping for optical recording mediaWO2003105142A1 *Jun 5, 2003Dec 18, 2003Buechler ChristianOptimized tracking method* Cited by examinerClassifications U.S. Classification369/44.28, 369/44.26, G9B/7.031, G9B/7.045International ClassificationG11B7/007, G11B7/085Cooperative ClassificationG11B7/00718, G11B7/08529, G11B7/08517European ClassificationG11B7/007G, G11B7/085A2Legal EventsDateCodeEventDescriptionMar 18, 2013FPAYFee paymentYear of fee payment: 12May 11, 2009ASAssignmentOwner name: IONOSEP X HOLDINGS L.L.C., DELAWAREFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:LG ELECTRONICS INC.;REEL/FRAME:022659/0383Effective date: 20090218May 7, 2009ASAssignmentOwner name: LG ELECTRONICS INC., KOREA, DEMOCRATIC PEOPLE S REFree format text: CONFIRMATORY ASSIGNMENT;ASSIGNOR:LG CORP.;REEL/FRAME:022645/0497Effective date: 20090227Apr 7, 2009ASAssignmentOwner name: IONOSEP X HOLDINGS L.L.C., DELAWAREFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:LG ELECTRONICS INC.;REEL/FRAME:022510/0555Effective date: 20090218Feb 5, 2009FPAYFee paymentYear of fee payment: 8Apr 13, 2005FPAYFee paymentYear of fee payment: 4Jul 21, 2000ASAssignmentOwner name: LG ELECTRONICS INC., KOREA, REPUBLIC OFFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:HONG, SEONG PYO;PARK, SANG ON;JEON, HYUNG JIN;REEL/FRAME:010961/0797Effective date: 20000713Owner name: LG ELECTRONICS INC. YOUNGDUNGPO-GU 20, YOIDO-DONGRotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services