WO2007148278A2 - A method and system for reading/writing an optical disc with a plurality of laser beams - Google Patents
A method and system for reading/writing an optical disc with a plurality of laser beams Download PDFInfo
- Publication number
- WO2007148278A2 WO2007148278A2 PCT/IB2007/052332 IB2007052332W WO2007148278A2 WO 2007148278 A2 WO2007148278 A2 WO 2007148278A2 IB 2007052332 W IB2007052332 W IB 2007052332W WO 2007148278 A2 WO2007148278 A2 WO 2007148278A2
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- WIPO (PCT)
- Prior art keywords
- laser beam
- beams
- laser
- reading
- writing
- Prior art date
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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
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/14—Heads, e.g. forming of the optical beam spot or modulation of the optical beam specially adapted to record on, or to reproduce from, more than one track simultaneously
-
- 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
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
- G11B7/08505—Methods for track change, selection or preliminary positioning by moving the head
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Recording Or Reproduction (AREA)
- Optical Head (AREA)
Abstract
A method of reading/writing an optical disc with a plurality of laser beams, wherein the plurality of laser beams comprise a first set of laser beam/beams (a, b), a second set of laser beam//beams (d, e), and a connecting laser beam (c) located between the first set of laser beam/beams and the second set of laser beam/beams, comprises the steps of: - switching on (110) the first set of laser beam//beams and the connecting laser beam to read/write, - switching off (120) the first set of laser beams, if a laser beam of the first set of laser beam/beams arrives at an area previously read/written by the connecting laser beam, - switching on (130) the second set of laser beam/laser beam/beams to read/write, and - shifting (140) all laser beams to a subsequent reading/writing position, if the connecting laser beam arrives at an area previously read/written by a laser beam of the second set of laser beam/laser beam/beams.
Description
A METHOD AND SYSTEM FOR READING/WRITING AN OPTICAL DISC WITH A
PLURALITY OF LASER BEAMS
FIELD OF THE INVENTION
The invention relates to a method and system for reading/writing an optical disc with a plurality of laser beams.
BACKGROUND OF THE INVENTION
In recent years, video/audio data has been rapidly digitized. In particular, video signals produce a very large number of data when they are digitized. Therefore, optical disc players for video signals, such as VCD (video compact disc) players, DVD (digital versatile disc) players, BD (blu-ray disc) players, are especially required to be capable of accommodating a large capacity and have a high data transfer rate.
Various attempts have been made to realize a large data capacity and high data transfer rate for optical disc players. According to one method, a multi-beam semiconductor in which a plurality of laser diodes is provided is employed to read/write data on an optical disc, using a plurality of laser beams simultaneously.
However, if a plurality of laser beams is used to read/write data on an optical disc simultaneously, the laser beams have to be shifted to a subsequent position to read/write a new revolution simultaneously after one revolution has been completed, which leads to a reduced reading/writing efficiency and speed. Furthermore, after being shifted, a first laser beam (such as an innermost laser beam along the radius direction of an optical disc) always locates at an area previously read/written by a last laser beam (such as an outermost laser beam along the radius direction of the optical disc), so the first laser beam has to wait a long time to reach a corresponding subsequent position for starting to read/write the new revolution, which also reduces efficiency and speed.
Another method is to increase the number of laser beams as much as possible, so as to reduce shifting times. But the problem of reducing efficiency and speed cannot be effectively solved in this manner, because a maximum number of laser beams is predefined according to an electronic power limitation of an optical disc drive.
A further method is to increase the number of interval tracks between two laser beams to reduce shifting times, but this also does not effectively solve the problem of reducing efficiency and speed as mentioned above. The maximum number of interval tracks is limited and predefined according to an electronic power limitation of an optical disc drive.
OBJECT AND SUMMARY OF THE INVENTION
It is an object of the invention to provide an improved method of reading/writing an optical disc with a plurality of laser beams.
The method is intended to read/write an optical disc with a plurality of laser beams, wherein the plurality of laser beams comprise a first set of laser beam/beam/beams, a second set of laser beam/beams, and a connecting laser beam located between the first set of laser beam/beam/beams and the second set of laser beam/beam/beams. The method comprises the steps of:
- switching on the first set of laser beam/beams and the connecting laser beam to write/read,
- switching off the first set of laser beam/beams, if a laser beam of the first set of laser beam/beams arrives at an area previously read/written by the connecting laser beam,
- switching on the second set of laser beam/beams to read/write, and
- shifting the plurality of laser beams so that each laser beam gets positioned at a subsequent reading/writing position, if the connecting laser beam arrives at an area previously read/written by a laser beam of the second set of laser beam/beams.
The invention also proposes a system comprising some processing units for implementing the different steps of the method according to the invention.
The advantage is that the method and system can decrease the shifting times of the laser beams without increasing the number of laser beams working synchronously
(switched-on synchronously) and the number of interval tracks, thereby improving the reading/writing efficiency and speed.
BRIEF DESCRIPTION OF THE DRAWINGS
These and other aspects of the method and system for reading/writing an optical disc with a plurality of laser beams, according to the invention, will become apparent from and will be elucidated with respect to the implementations and embodiments described hereinafter and with reference to the accompanying drawings, wherein:
Fig. 1 depicts a flow chart of a method according to the invention of reading/writing an optical disc with a plurality of laser beams,
Figs. 2A to Fig. 2D illustrate, by means of an example, different and consecutive states resulting from the steps of the method according to Fig.l,
Fig.3 depicts a system for implementing the method previously described in Fig.l.
Same reference numerals are used to denote similar parts throughout the Figures.
DETAILED DESCRIPTION OF THE INVENTION
In the following, a laser beam "switched off will refer to a state where the reading/writing process is "off, i.e. not working or not activated, e.g. a laser beam is not applied on the optical disc or a laser beam is not applied on the optical disc in a reading/writing mode. A laser beam "switched on" will refer to a state where the reading/writing process is "on", i.e. working or activated, namely, the laser beam is in a reading/writing mode.
Fig. 1 depicts a flow chart of the method according to the invention of reading/writing an optical disc with a plurality of laser beams. Fig. 2A to Fig.2D illustrate, by means of an example, different and consecutive states resulting from the steps of the embodiment according to Fig.l, via five laser beams a, b, c, d, and e.
The plurality of laser beams comprise a first set of laser beam/beams (a, b), a second set of laser beam/beams (d, e), and a connecting laser beam (c) located between the
first set of laser beam/beams (a, b) and the second set of laser beam/beams (d, e). As shown in Fig.l, the method comprises the steps of:
- switching on (110) the first set of laser beam/beams (a, b) and the connecting laser beam (c) to write/read after receiving a reading/writing signal. As shown in Fig. 2A, both the first set of laser beams (a, b) and the connecting laser beam (c) are in the "switched on" state, and start to read/write in a direction indicated by means of an arrow (f). The second set of laser beams (d, e) are in the " switched off" state. The first set of laser beams (a, b) and the connecting laser beam (c) are working laser beams, and the number of the first set of laser beams (a, b) is less than a maximum number of working laser beams. The maximum number of working laser beams is predefined according to an electronic power limitation of an optical disc drive. The number of working laser beams does not exceed the maximum number according to the power limitation of an optical disc drive system.
- switching off (120) the first set of laser beams (a, b), if a laser beam (b) of the first set of laser beam/beams (a, b) arrives at an area previously read/written by the connecting laser beam (c). As shown in Fig.2B, the laser beam (a) arrives at an area read/written by the laser beam (b), and the laser beam (b) synchronously arrives at an area read/written by the connecting laser beam (c). The first set of laser beams (a, b) are switched off, so that the read/written areas are not overlapped. In this period of time, a first revolution of reading/writing an optical disc is realized.
- switching on (130) the second set of laser beam/beams (d, e) to read/write.
Also as shown in Fig. 2B, the second set of laser beams (d, e) are switched on and start to read/write with the connecting laser beam (c) directly in order to realize a second revolution of reading/writing the optical disc . The working laser beams comprise the second laser beams (d, e) and the connecting laser beam (c). In this example, the number of the second set of laser beams (d, e) is equal to the number of the first set of laser beams (a, b). Of course, the number of the second set of laser beams (d, e) may be
different from the number of the first set of laser beams (a, b), but it is necessary to keep the number of the second set of laser beams (d, e) below the maximum number of working laser beams. When the second set of laser beams (d, e) start to read/write during the second disc revolution, the three working laser beams (c, d, e) are not shifted to a subsequent position after the first reading/writing the optical disc revolution, thereby improving reading/writing speed and efficiency. Furthermore, all working laser beams, including the connecting laser beam (c), are not located in an area previously read/written by other laser beams and start to read/write directly during the second writing/reading the optical disc revolution without waiting, which also improves reading/writing speed and efficiency.
- shifting (140) the plurality of laser beams so that each laser beam is positioned at a subsequent reading/writing position, if the connecting laser beam (c) arrives at an area previously read/written by a laser beam (d) of the second set of laser beam/beams (d, e). As shown in Fig.2C, the laser beam (c) arrives at an area previously read/written by the laser beam (d), and the laser beam (d) synchronously arrives at an area previously read/written by the connecting laser beam (e). So, the second reading/writing the optical disc revolution is completed, as shown in Fig.2D; the plurality of laser beams, including the first set of laser beams (a, b), the connecting laser beam (c), and the second set of laser beams (d, e), must be shifted to a subsequent position for reading/writing continually after the second reading/writing the optical disc revolution. If the plurality of laser beams is shifted to a subsequent position in a direction indicated by means of an arrow (f), a next reading/writing signal will be generated. This shifting (140) step implies a simultaneous movement of all laser beams, for example via a translation movement along a radial direction of the optical disc.
Advantageously, the method further comprises a step of:
- replacing (150) the connecting laser beam (c) with another laser beam of the plurality of laser beams (a, b, c, d, e) by exchanging the positions of the
connecting laser beam (c) and said another laser beam. Said other laser beam of the plurality of laser beams is intended to be an innermost laser beam (a) of the plurality of laser beams, if the reading/writing is done from inner tracks of the optical disc to outer tracks of the optical disc. Said other laser beam of the plurality of laser beams is intended to be an outermost laser beam of the plurality of laser beams, if the reading/writing is done from outer tracks to inner tracks. For example, the step of replacing (150) is implemented for maintaining a balanced usage of every laser beam, because the connecting laser beam (c) is always in a working state.
The plurality of laser beams can also be predefined as three sets of laser beams, four sets of laser beams, etc. Between every two adjacent sets there is a connecting laser beam, e.g. a first connecting laser beam, a second connecting laser beam, a third connecting laser beam, etc. The second connecting laser beam for connecting the second set of laser beam/beams and the third set of laser beam/beams (not shown) is a last laser beam (e) of the second set of laser beam/beams (d, e) along the writing/reading direction (arrow (g) in Fig. 2C), and the third connecting laser beam for connecting the third set of laser beam/beams and the fourth set of laser beam/beams (not shown) is a last laser beam (not shown) of the third set of laser beam/beams along the writing/reading direction (arrow
(g)).
For example, the plurality of laser beams comprises three sets of laser beams, after the connecting laser beam (c, i.e. the first connecting laser beam) arrives at an area previously read/written by a laser beam (d) of the second set of laser beam/beams (d, e), the laser beam (e) becomes a second connecting laser beam, and the first connecting laser beam (c) becomes a laser beam of the second set of laser beams (c, d). At this time, the second set of laser beams (c, d) is switched off, and the third set of laser beam/beams is switched on for reading/writing during a third revolution or writing/reading the optical disc. After the third revolution of reading/writing the optical disc is completed, the shifting (140) step is implemented.
In a similar way, four sets of laser beams or five sets of laser beams may also be implemented according to the invention. If the plurality of laser beams comprises four sets of laser beams, the shifting step (140) will be implemented after four revolutions of reading/writing an optical disc ; if the plurality of laser beams comprises five sets of laser
beams, the shifting step (140) will be implemented after the five revolutions of reading/writing the optical disc
The interval between two laser beams is predefined according to the type of optical disc drive. Every set of laser beams may comprise one laser beam or more than one laser beam.
Fig.3 depicts a system for implementing the method previously described in Fig.l. Fig. 2A to Fig.2F illustrate, by means of an example, different and consecutive states of laser beams, via the use of five laser beams a, b, c, d, and e.
The plurality of laser beams comprise a first set of laser beam/beams (a, b), a second set of laser beam/beams (d, e), and a connecting laser beam (c) located between the first set of laser beam/beams (a, b) and the second set of laser beam/beams (d, e). As shown in Fig.3, the system 300 comprises:
- a first operating unit (311) for switching on the first set of laser beam/beams
(a, b) and the connecting laser beam (c) to write/read after receiving a reading/writing signal (RSAVS). The first set of laser beams (a, b) and the connecting laser beam (c) are working laser beams. The number of the first set of laser beams (a, b) must be less than a maximum number of working laser beams. The maximum number of working laser beams is predefined according to an electronic power limitation of an optical disc drive. The number of working laser beams can be equal to or less than the maximum number.
- a second operating unit (312) for switching off the first set of laser beams (a, b), if a laser beam (b) of the first set of laser beam/beams (a, b) arrives at an area previously read/written by the connecting laser beam (c). The first set of laser beams (a, b) are switched off, so that the read/written areas are not overlapped. In this period of time, a first revolution of reading/writing the optical disc is completed.
- a third operating unit (313) for switching on the second set of laser beam//beams (d, e), so that the second set of laser beams (d, e) can start to
read/write with the connecting laser beam (c) directly for realizing a second reading/writing disc revolution. In this example, the number of the second set of laser beams (d, e) is equal to the number of the first set of laser beams (a, b). Of course, the number of the second set of laser beams (d, e) may be unequal to the number of the first set of laser beams (a, b), but it is necessary to keep the number of the second set of laser beams below the maximum number of working laser beams.
- a controlling unit (320) for shifting the plurality of laser beams so that each laser beam is positioned at a subsequent reading/writing position, if the connecting laser beam (c) arrives at an area previously read/written by a laser beam (d) of the second set of laser beam/beams (d, e). If the plurality of laser beams is shifted to a subsequent position along a direction indicated by an arrow (g), a next reading/writing signal (RSAVS) will be generated. This shifting implies a simultaneous movement of all laser beams, for example via a translation movement along a radial direction of the optical disc. For example, the shifting could be done via similar actuation means (not shown) usually applied to move a laser beam along the radial direction, under the control of the controlling unit (320).
The first operating unit (311), the second operating unit (312), and the third operating unit (313) are included in an operating unit (310).
The system 300 further comprises a replacing unit (330) for replacing the connecting laser beam (c) with another laser beam of the plurality of laser beams by exchanging the positions of the connecting laser beam (c) and said other laser beam. Said other laser beam of the plurality of laser beams is intended to be an innermost laser beam (a) of the plurality of laser beams, if the reading/writing is done from inner tracks of the optical disc to outer tracks of the optical disc. Said other laser beam of the plurality of laser beams is intended to be an outermost laser beam of the plurality of laser beams, if the reading/writing is done from outer tracks to inner tracks.
This system 300 may advantageously be integrated in a player (or recorder) for optical discs (e.g. computer disc drive, standalone apparatus...).
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be constructed as limiting the claim. The word 'comprising' does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention can be implemented by means of hardware comprising several distinct elements and by means of a suitable programmed computer. In the unit claims enumerating several means, several of these means can be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera, does not indicate any ordering. These words are to be interpreted as names.
Claims
1. A method of reading/writing an optical disc with a plurality of laser beams, wherein the plurality of laser beams comprise a first set of laser beam/beams (a, b), a second set of laser beam/beams (d, e), and a connecting laser beam (c) located between the first set of laser beam/beams (a, b) and the second set of laser beam/beams (d, e), the method comprising the steps of:
- switching on (110) the first set of laser beam/beams (a, b) and the connecting laser beam (c) to write/read,
- switching off (120) the first set of laser beams (a, b), if a laser beam (b) of the first set of laser beam/beams (a, b) arrives at an area previously read/written by the connecting laser beam (c),
- switching on (130) the second set of laser beam/beams (d, e) to read/write, and
- shifting (140) the plurality of laser beams so that each laser beam is positioned at a subsequent reading/writing position, if the connecting laser beam (c) arrives at an area previously read/written by a laser beam (d) of the second set of laser beam/beams (d, e).
2. A method as claimed in claim 1, further comprising a step of:
- replacing (150) the connecting laser beam (c) with another laser beam of the plurality of laser beams by exchanging the positions of the connecting laser beam (c) and said other laser beam.
3. A method as claimed in claim 2, wherein said other laser beam of the plurality of laser beams is intended to be an innermost laser beam (a) of the plurality of laser beams, if the reading/writing is done from inner tracks of the optical disc to outer tracks of the optical disc; said other laser beam of the plurality of laser beams is intended to be an outermost laser beam of the plurality of laser beams, if the reading/writing is done from outer tracks to inner tracks.
4. A method as claimed in claim 1, wherein the number of the first set of laser beam/beams (a, b) is equal to the number of the second set of laser beam/beams (d, e).
5. A method as claimed in claim 1, wherein the number of the first set of laser beam/beams (a, b) and the number of the second set of laser beam/beams are less than a maximum number of working laser beams.
6. A system for reading/writing data on an optical disc with a plurality of laser beams, wherein the plurality of laser beams comprise a first set of laser beam/beams (a, b), a second set of laser beams (d, e), and a connecting laser beam (c) located between the first set of laser beam/beams (a, b) and the second set of laser beam/beams (d, e), the system comprising:
- a first operating unit (311) for switching on the first set of laser beam/beams
(a, b) and the connecting laser beam (c) to write/read,
- a second operating unit (312) for switching off the first set of laser beams (a, b), if a laser beam (b) of the first set of laser beam/beams (a, b) arrives at an area previously read/written by the connecting laser beam (c),
- a third operating unit (313) for switching on the second set of laser beam/beams (d, e) to read/write, and
- a controlling unit (320) for shifting the plurality of laser beams so that each laser beam is positioned at a subsequent reading/writing position, if the connecting laser beam (c) arrives at an area previously read/written by a laser beam (d) of the second set of laser beam/beams (d, e).
7. A system as claimed in claim 6, further comprising:
- a replacing unit (330) for replacing the connecting laser beam (c) with another laser beam of the plurality of laser beams by exchanging the positions of the connecting laser beam (c) and said other laser beam.
8. A system as claimed in claim 7, wherein said other laser beam of the plurality of laser beams is intended to be an innermost laser beam (a) of the plurality of laser beams, if the reading/writing is done from inner tracks of the optical disc to outer tracks of the optical disc; said other laser beam of the plurality of laser beams is intended to be an outermost laser beam of the plurality of laser beams, if the reading/writing is done from outer tracks to inner tracks.
9. A system as claimed in claim 6, wherein the number of the first set of laser beam/beams (a, b) and the number of the second set of laser beam/beams are less than a maximum number of working laser beams.
10. A player for writing/reading an optical disc, said player comprising a system as claimed in claim 6, 7, 8 or 9.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610093286.8 | 2006-06-23 | ||
| CN200610093286 | 2006-06-23 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO2007148278A2 true WO2007148278A2 (en) | 2007-12-27 |
| WO2007148278A3 WO2007148278A3 (en) | 2008-02-21 |
Family
ID=38658500
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/IB2007/052332 WO2007148278A2 (en) | 2006-06-23 | 2007-06-19 | A method and system for reading/writing an optical disc with a plurality of laser beams |
Country Status (2)
| Country | Link |
|---|---|
| TW (1) | TW200802347A (en) |
| WO (1) | WO2007148278A2 (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5457670A (en) * | 1992-12-09 | 1995-10-10 | Pioneer Electronic Corporation | Optical disk information recording apparatus and reproducing apparatus having a plurality of read or write beams |
| EP0840294A2 (en) * | 1996-10-29 | 1998-05-06 | Samsung Electronics Co., Ltd. | Multiple track scanning method for optical pickup |
| US6385143B1 (en) * | 1997-10-14 | 2002-05-07 | Kabushiki Kaisha Kenwood | Method and apparatus of multibeam optical disc readout |
| US6493297B1 (en) * | 1990-05-09 | 2002-12-10 | Hitachi, Ltd. | Multibeam optical disk record and reproduction apparatus and method |
| WO2007046040A2 (en) * | 2005-10-20 | 2007-04-26 | Koninklijke Philips Electronics N.V. | A method and system for recording data on an optical disc by a plurality of laser beams |
| WO2007063458A1 (en) * | 2005-11-29 | 2007-06-07 | Koninklijke Philips Electronics N.V. | System and method of reading/writing data on an optical disc by a plurality of spots |
| WO2007063456A1 (en) * | 2005-11-29 | 2007-06-07 | Koninklijke Philips Electronics N.V. | Method and system for reading/writing data by a plurality of spots |
-
2006
- 2006-06-30 TW TW95124033A patent/TW200802347A/en unknown
-
2007
- 2007-06-19 WO PCT/IB2007/052332 patent/WO2007148278A2/en active Application Filing
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6493297B1 (en) * | 1990-05-09 | 2002-12-10 | Hitachi, Ltd. | Multibeam optical disk record and reproduction apparatus and method |
| US5457670A (en) * | 1992-12-09 | 1995-10-10 | Pioneer Electronic Corporation | Optical disk information recording apparatus and reproducing apparatus having a plurality of read or write beams |
| EP0840294A2 (en) * | 1996-10-29 | 1998-05-06 | Samsung Electronics Co., Ltd. | Multiple track scanning method for optical pickup |
| US6385143B1 (en) * | 1997-10-14 | 2002-05-07 | Kabushiki Kaisha Kenwood | Method and apparatus of multibeam optical disc readout |
| WO2007046040A2 (en) * | 2005-10-20 | 2007-04-26 | Koninklijke Philips Electronics N.V. | A method and system for recording data on an optical disc by a plurality of laser beams |
| WO2007063458A1 (en) * | 2005-11-29 | 2007-06-07 | Koninklijke Philips Electronics N.V. | System and method of reading/writing data on an optical disc by a plurality of spots |
| WO2007063456A1 (en) * | 2005-11-29 | 2007-06-07 | Koninklijke Philips Electronics N.V. | Method and system for reading/writing data by a plurality of spots |
Also Published As
| Publication number | Publication date |
|---|---|
| TW200802347A (en) | 2008-01-01 |
| WO2007148278A3 (en) | 2008-02-21 |
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