US20060203632A1 - Method for adjusting mechanical error of optical disc reading device - Google Patents
Method for adjusting mechanical error of optical disc reading device Download PDFInfo
- Publication number
- US20060203632A1 US20060203632A1 US11/422,021 US42202106A US2006203632A1 US 20060203632 A1 US20060203632 A1 US 20060203632A1 US 42202106 A US42202106 A US 42202106A US 2006203632 A1 US2006203632 A1 US 2006203632A1
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- US
- United States
- Prior art keywords
- envelope
- wave
- optical disc
- optical pickup
- crossing signal
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- Legal status (The legal status 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 status listed.)
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- 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
- G11B7/082—Aligning the head or the light source relative to the record carrier otherwise than during transducing, e.g. adjusting tilt set screw during assembly of head
-
- 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
- G11B7/22—Apparatus or processes for the manufacture of optical heads, e.g. assembly
-
- 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
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/0901—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following only
- G11B7/0903—Multi-beam tracking systems
Abstract
The present invention provides a method for adjusting the mechanical error of an optical disc reading device. The optical disc reading device consists of a driving device and an optical pickup. The driving device has a base plate for supporting and rotating an optical disc. The method consists of moving the optical pickup to surface of optical disc, the optical pickup emitting two tracking light spots onto the surface, and the optical pickup reciprocally moving relative to the surface. Next, the optical pickup reads reflected signal of two tracking light spots for generating a track crossing signal. By using the track crossing signal, the method adjusts position of optical pickup relative to the base plate.
Description
- This Application is a continuation of U.S. Utility patent application Ser. No. 10/457,640 filed on Jun. 9, 2003 and claims priority to Taiwan Patent Application No. 091112660 filed on Jun. 11, 2002.
- The present invention relates to a method for adjusting the mechanical error. In particular, the present invention relates to a method for examining and adjusting the mechanical error of an optical disc reading device.
- An optical disc device typically includes tracking servo control. The optical disc device emits a beam of light to a particular position of a track on the disc when the optical disc device records, replays or erases the data of the optical disc. The optical disc device obtains the tracking error by detecting the reflected beam from the spot on the optical disc. The tracking servo control corrects the tracking error to zero, hence the light spot falls on the accurate position of the track of the optical disc. There is a detailed description about the technology correcting tracking error in the U.S. Pat. No. 5,828,634.
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FIG. 1A andFIG. 1B are schematic diagrams for explaining how to obtain a traditional track crossing signal. As shown inFIG. 1A , thepit track 112 and theland track 114 are disposed alternatively on the surface of theoptical disc 110. Generally, the data are recorded in thepit track 112. The radial direction of theoptical disc 110 is the track crossing direction which is presented as arrow “X”. The tangential direction of theoptical disc 110 is the rotating direction which is presented as arrow “Y”. - The traditional three-beam method for obtaining the track crossing signal is to use a laser to impinge on the surface of the
optical disc 110 and generate three spots on the surface of theoptical disc 110. Themain spot 117, thesubordinate spot 116 and the othersubordinate spot 118 are substantially located in a line. The difference in brightness of the reflected light corresponding to thesubordinate spots main spot 117 falls on apit track 112. - As shown in
FIG. 1B , when themain spot 117 falls on the track crossing position, the half part of themain spot 117 falls on thepit track 112 and the other half part falls on theland track 114. There is a maximum value of the absolute value of the difference in brightness of the reflected lights corresponding to thesubordinate spots -
FIG. 1C is a schematic diagram of a traditional track crossing signal observed on the oscilloscope. When theoptical disc 110 is rotating and the optical pickup is fixed, the reflected lights corresponding to thesubordinate spots track crossing signal 120. Thetrack crossing signal 120 shown on the oscilloscope includes a continuous sine wave and cosine wave and the wave number and the amplitude relate to the parameters which are set in the oscilloscope. A wave envelope ofwave peak 122 can be obtained by connecting several wave peaks of thetrack crossing signal 120. Also, a wave envelope ofwave troughs 124 can be obtained by connecting several wave troughs of thetrack crossing signal 120. - Point “A” is on the
wave envelope 122 of wave peaks, point “B” corresponds to point “A” and is on thewave envelope 124 of wave troughs. The difference of amplitude of these two points is a maximum “Am1”, and the maximum “Am1” corresponds to the maximum absolute value of the difference in brightness of reflected lights corresponding to thesubordinate spots FIG. 1B . - However, the defect of the
optical disc 110, such as an eccentric optical disc, makes the resulting track crossing signal different from thetrack crossing signal 120 shown inFIG. 1C . The mechanism and quality of the components of the optical disc device also cause the track crossing signal to be different from thetrack crossing signal 120 shown inFIG. 1C . Thus, it is desired to improve the disc-reading capability of the optical disc device. - One aspect of the present invention provides a method for adjusting the mechanical error of the optical disc reading device. The reading efficiency of the optical disc reading device is improved by the method.
- Another aspect of the present invention provides a method for examining the mechanical error of the optical disc reading device. The mechanical error of the optical disc reading device can be examined by analyzing the track crossing signal.
- Another aspect of the present invention provides an optical disc reading device for adjusting the mechanical error of the optical pickup. The optical pickup of the optical disc reading device is adjusted by the screws according to the fluctuation of the track crossing signal. The adjustment minimizes the mechanical error and improves the reading efficiency of the optical disc reading device.
- The present invention provides a method for adjusting the mechanical error of the optical disc reading device. The optical disc reading device includes an optical pickup and a driving device including a base plate for supporting and rotating an optical disc. In the first step of the method, the optical pickup is moved to the surface of the optical disc. In the second step, the optical pickup emits two tracking light spots onto the surface and the base plate performs a relative movement between the tracking light spots and the track on the surface. Next, the optical pickup reads the reflected light to generate a track crossing signal. The mechanical error is examined using the track crossing signal and the relative position between the optical pickup and the base plate is adjusted according to the track crossing signal.
- The present invention provides an optical disc reading device for adjusting the mechanical error of the optical pickup. The optical disc reading device includes an optical pickup, a base plate and guide bars. The base plate has a center and supports an optical disc. The guide bars include an end terminal and define a moving trace. The guide bars guide a relative movement between the optical pickup and the optical disc. The feature of the optical disc reading device resides in having at least a screw on the end terminal. The screw adjusts the guide bars making the moving trace to pass through the center of the base plate.
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FIG. 1A andFIG. 1B are schematic diagrams for explaining how to obtain a traditional track crossing signal; -
FIG. 1C is a schematic diagram showing a traditional track crossing signal; -
FIG. 2 is a flow chart of the present invention; -
FIG. 3A is a top view of an optical disc reading device for explaining how the present invention uses an optical disc to examine the mechanical error of the optical disc reading device; -
FIG. 3B is a schematic diagram of the track crossing signal obtained using the device ofFIG. 3A ; -
FIG. 3C is a side view of an optical disc reading device for explaining how the present invention uses an optical disc to examine and adjust the mechanical error of the optical disc reading device; and -
FIG. 4A andFIG. 4B are schematic diagrams of the track crossing signal when an eccentric disc is used to examine the mechanical error of the optical disc reading device. - When illustrating an exemplary embodiment of the present invention with the provided two-dimensional diagram, persons skilled in the art can understand the actual configuration of an optical disc reading device or a disc includes a three-dimensional construction and these two-dimensional diagrams are not intended to be construed in a limiting sense. Furthermore, to better illustrate the present invention, the provided schematic diagrams of optical disc reading device and track crossing signal are intentionally not enlarged in the same scale. In addition, to focus on the problem to be solved by the present invention, the schematic diagrams provided to illustrate the present invention do not include other irrelevant components or structures of the optical disc device. The optical disc device includes other components or structures in actual operation which are not shown in diagrams presented.
- The present invention is a method for adjusting mechanical error of an optical disc reading device. The optical disc reading device includes a driving device and an optical pickup including a base plate.
FIG. 2 is a flow diagram of the present invention. Instep 30, the base plate supports and rotates an optical disc. Instep 32, the optical pickup is moved to the optical disc. Instep 34, the optical pickup emits two tracking beams onto the optical disc. In thestep 36, the driving device performs a relative movement between the optical pickup and the track on the optical disc. In the present invention,step 34 and step 36 can be exchanged reversely. Instep 38, the optical pickup reads the reflected light from the surface of optical disc corresponding to two tracking beams. Same as the prior art, a track crossing signal is acquired by transforming and calculating the brightness of the reflected light. The track crossing signal can also be read and shown on a typical oscilloscope. Instep 39, the present invention utilizes the track crossing signal to determine mechanical error of the optical disc reading device and adjusts the relative structures of components of the optical disc reading device by observing fluctuation of the track crossing signal. For example, a maximum value of peak-to-peak of track crossing signal is resulted by changing the relative position between the optical pickup and the base plate. -
FIG. 3A is a top-view diagram of the major portion of the optical disc reading device and is used to explain an exemplary embodiment of the present invention. An opticaldisc reading device 10 includes a drivingdevice 11 and anoptical pickup 12. The drivingdevice 11 includes abase plate 13 for supporting and rotating an optical disc (not show in the diagram). The drivingdevice 11 drives the optical disc to pass through thecenter 14 of thebase plate 13 and rotates the optical disc around an axle perpendicular to the surface of the optical disc. The drivingdevice 11 also includes a device, e.g., a gear wheel (not shown in the diagram) for performing a relative movement between theoptical pickup 12 and thebase plate 13. Thebase plate 13 includes guide bars 15 on both sides. The guide bars 15 provide a moving trace and guide theoptical pickup 12 to move along the moving trace. The guide bars 15 have asupport 16 on the ends for connecting the guide bars 15. - The embodiment of the invention uses a non-eccentric optical disc which is placed on the
base plate 13. The center of optical disc coincides with thecenter 14 of thebase plate 13. When the drivingdevice 11 rotates the optical disc, the pit track and the land track also rotate along the axle as described above. Then, the drivingdevice 11 drives theoptical pickup 12 to move along to the guide bars 15. It means that theoptical pickup 12 moves relatively to thebase plate 13. When theoptical pickup 12 moves to the surface of the optical disc, theoptical pickup 12 emits two tracking beams and forms two tracking light spots on the surface of the optical disc. Theoptical pickup 12 reads the light which is reflected from the surface corresponding to the two tracking light spots. The opticaldisc reading device 10 transforms the brightness of the reflected light and generates a track crossing signal shown on the oscilloscope. - Nevertheless, in the embodiment of the present invention, the mechanical error of the optical
disc reading device 10 causes the moving trace to not pass through thecenter 14 of thebase plate 13. Consequently, after transformation and calculation, the absolute value of the difference of the brightness of the reflected light is smaller than the maximum value “Am1” depicted inFIG. 1C . -
FIG. 3B is a diagram of the track crossing signal based on the embodiment. AsFIG. 3B shows, a plurality of wave peaks of atrack crossing signal 20 forms awave envelope 22 and a plurality of wave troughs of thetrack crossing signal 20 forms awave envelope 24. A point “C” of thewave envelope 22 and a point “D” of thewave envelope 24 are selected as datum points. The point “C” corresponds to point “D” and the difference of amplitude is “Am2”. “Am2” is smaller than the maximum value “Am1” inFIG. 1C . Thetrack crossing signal 20 of this type is easily observed when theoptical pickup 12 moves closer to thecenter 14. - The present invention utilizes the
track crossing signal 20 obtained to examine mechanical error of the opticaldisc reading device 10. The mechanical error causes the moving trace to not pass through thecenter 14 of thebase plate 13. Furthermore, the present invention uses thetrack crossing signal 20 obtained and an extra adjustment mechanism for reducing the mechanical error of the opticaldisc reading device 10.FIG. 3C is a schematic diagram of an optical disc reading device to illustrate the adjustment mechanism of the present invention. Thescrews 17 are provided on thesupport 16 to adjust the position of the guide bars 15. Then, thescrews 17 adjust the moving trace to pass through thecenter 14 of thebase plate 13. - In the process of adjustment, a corresponding variation of the difference of amplitude is obtained by observing the
track crossing signal 20. When the moving trace is adjusted to approach or pass through thecenter 14 of thebase plate 13, the difference of amplitude, “Am2”, increases gradually to approach or equal to the maximum value, “Am1”. When the moving trace is moved away from thecenter 14, the difference of amplitude, “Am2”, decreases gradually. Consequently, in the process of the adjustment, when the maximum difference of amplitude, “Am2”, appears, it means the mechanical error of optical disc reading device is reduced to a minimum. In the exemplary embodiment, the mechanical error is adjusted for maximizing the difference of amplitude, “Am2”, to a maximum value, “Am1”, or a maximum value of peak-to-peak without mechanical error. -
FIG. 4A andFIG. 4B are two schematic diagrams of track crossing signal according to the present invention utilizing an eccentric optical disc to examine the mechanical error of optical disc reading device. As shown inFIG. 4A , there are two points “E” and “F” of adjacent wave troughs on thewave envelope 22 defined by wave peaks of thetrack crossing signal 20. And the two points respectively correspond to two points of adjacent wave peaks on thewave envelope 24 defined by wave troughs of thetrack crossing signal 20. The difference of amplitude, “Am3” and “Am4”, are obviously different. That is to say, the eccentric error of the optical disc and the mechanical error of optical disc reading device make the adjacent difference of amplitude, “Am3” and “Am4”, very different. Thetrack crossing signal 20 of this type is observed more easily when theoptical pickup 12 approaches to thecenter 14. - As shown in
FIG. 3C , thescrews 17 adjust the position of the guide bars 15 and make the moving trace to pass through thecenter 14 of thebase plate 13. During the process, since the opticaldisc reading device 10 is examined using the eccentric optical disc, from thetrack crossing signal 20, shown inFIG. 4B , it is observed the difference of amplitude “Am3” and “Am4” are almost equal. It means that the mechanical error of opticaldisc reading device 10 is very small. - As described above, the present invention provides an optical reading device capable of adjusting the mechanical error of optical pickup. The optical reading device at least includes an optical pickup, a base plate and guide bars. The base plate includes a center and supports an optical disc. The guide bars include an end terminal which defines a moving trace and guide the optical pickup and optical disc to perform a relative movement on the moving trace. The feature of the optical reading device includes at least a screw which is disposed on the end terminal. The guide bars are adjusted to make the moving trace passing through the center by the screws.
- In the foregoing specification the invention has been described with reference to specific exemplar aspects thereof. It will, however, be evident that various modification and changes may be made thereto without departing from the broader spirit and scope of the invention. The specification and drawings are, accordingly, to be regarded in an illustrative rather than restrictive sense.
Claims (22)
1. A method for adjusting mechanical error of optical disc reading device, said optical disc reading device comprising a driving device, an optical pickup, said driving device comprising a base plate for supporting and rotating an optical disc having a surface, said surface having at least one track, said method comprising:
moving said optical pickup to said surface along said moving trace, said optical pickup emitting tracking light spots onto said surface;
performing relative movement between said tracking light spots and said track along said moving trace;
generating a track crossing signal by reading reflected signals from said surface corresponding to said tracking light spots; and
adjusting said moving trace of said optical pickup relative to said base plate according to said track crossing signal.
2. The method according to claim 1 , wherein said track crossing signal comprises a sine wave.
3. The method according to claim 2 , wherein said adjusting step is performed to have a maximum value of peak-to-peak of said sine wave.
4. The method according to claim 2 , wherein said sine wave comprises a plurality of peaks together defining a wave envelope, said wave envelope comprises a plurality of envelope troughs, and said adjusting step causes values of said envelope troughs to be substantially equal to one another.
5. The method according to claim 2 , wherein said sine wave comprises a plurality of troughs together defining a wave envelope, said wave envelope comprises a plurality of envelope peaks, and said adjusting step causes values of said envelope peaks to be substantially equal to one another.
6. The method according to claim 1 , wherein said track crossing signal comprises a cosine wave.
7. The method according to claim 6 , wherein said adjusting step is performed to have a maximum value of peak-to-peak of said cosine wave.
8. The method according to claim 6 , wherein said cosine wave comprises a plurality of peaks together defining a wave envelope, said wave envelope comprises a plurality of envelope troughs, and said adjusting step causes values of said envelope troughs to be substantially equal to one another.
9. The method according to claim 6 , wherein said cosine wave comprises a plurality of troughs together defining a wave envelope, said wave envelope comprises a plurality of envelope peaks, and said adjusting step causes values of said envelope peaks to be substantially equal to one another.
10. A method for examining a moving trace of an optical pickup of an optical disc reading device, said optical reading device comprising a driving device, said driving device including a base plate for supporting and rotating a disc, said disc having a surface, said surface having at least one track, said method comprising:
moving said optical pickup along said moving trace to said surface, for emitting tracking light spots on said surface;
performing relative movement between said track light spots and said track along said moving trace;
reading the reflected signals of said tracking light spots;
calculating said reflected signals to generate a track crossing signal; and
examining if said track crossing signal is optimized.
11. The method according to claim 10 , wherein said track crossing signal comprises a sine wave.
12. The method according to claim 11 , wherein said examining step examines if a maximum value of peak-to-peak of said sine wave is obtained.
13. The method according to claim 11 , wherein said sine wave comprises a plurality of troughs together defining a wave envelope, said wave envelope comprises a plurality of envelope peaks, and said examining step examines if values of said plurality of envelope peaks are substantially equal to one another.
14. The method according to claim 11 , wherein said sine wave comprises a plurality of peaks together defining a wave envelope, said wave envelope comprises a plurality of envelope troughs, and said examining step examines if values of said plurality of envelope troughs are substantially equal to one another.
15. The method according to claim 10 , wherein said track crossing signal comprises a cosine wave.
16. The method according to claim 15 , wherein said examination step examines if a maximum value of peak-to-peak of said cosine wave is obtained.
17. The method according to claim 15 , wherein said cosine wave comprises a plurality of troughs together defining a wave envelope, said wave envelope comprises a plurality of envelope peaks, and said examining step examines if values of said plurality of envelope peaks are substantially equal to one another.
18. The method according to claim 15 , wherein said cosine wave comprises a plurality of peaks together defining a wave envelope, said wave envelope comprises a plurality of envelope troughs, and said examining step examines if values of said plurality of envelope troughs are substantially equal to one another.
19. An optical disc reading apparatus for operating an optical disc, said optical disc having a surface with at least one track, comprising:
a base plate for supporting and rotating said optical disc;
an optical pickup for emitting tracking light spots on said surface so that a track crossing signal is generated by reading reflected signals from said surface corresponding to said tracking light spots;
a guiding unit for providing a moving trace to guide said optical pickup to said surface;
a driving device for moving said optical pickup along said moving trace; and
adjustment unit for adjusting said moving trace of said optical pickup relative to said base plate.
20. The optical disc reading apparatus according to claim 19 , wherein said adjustment unit adjusts said moving trace of said optical pickup relative to said base plate according to said track crossing signal.
21. The optical disc reading apparatus according to claim 20 , wherein said track crossing signal comprises a sine wave, and said moving trace is adjusted to obtain a maximum value of peak-to-peak of said sine wave.
22. The optical disc reading apparatus according to claim 19 , wherein said adjustment unit is configured to horizontally move said guiding unit relative to said optical disc so as to adjust said moving trace of said optical pickup relative to said base plate.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US11/422,021 US20060203632A1 (en) | 2002-06-11 | 2006-06-02 | Method for adjusting mechanical error of optical disc reading device |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW091112660 | 2002-06-11 | ||
TW091112660A TW589634B (en) | 2002-06-11 | 2002-06-11 | Method for adjusting mechanical error of optical disc reading device |
US10/457,640 US7065011B2 (en) | 2002-06-11 | 2003-06-09 | Method for adjusting mechanical error of optical disc reading device |
US11/422,021 US20060203632A1 (en) | 2002-06-11 | 2006-06-02 | Method for adjusting mechanical error of optical disc reading device |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US10/457,640 Continuation US7065011B2 (en) | 2002-06-11 | 2003-06-09 | Method for adjusting mechanical error of optical disc reading device |
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US20060203632A1 true US20060203632A1 (en) | 2006-09-14 |
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US10/457,640 Expired - Fee Related US7065011B2 (en) | 2002-06-11 | 2003-06-09 | Method for adjusting mechanical error of optical disc reading device |
US11/422,021 Abandoned US20060203632A1 (en) | 2002-06-11 | 2006-06-02 | Method for adjusting mechanical error of optical disc reading device |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
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US10/457,640 Expired - Fee Related US7065011B2 (en) | 2002-06-11 | 2003-06-09 | Method for adjusting mechanical error of optical disc reading device |
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US (2) | US7065011B2 (en) |
TW (1) | TW589634B (en) |
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TW589634B (en) * | 2002-06-11 | 2004-06-01 | Benq Corp | Method for adjusting mechanical error of optical disc reading device |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6493296B1 (en) * | 1998-11-10 | 2002-12-10 | Sony Corporation | Optical disc inclination detecting method, optical pickup device, and optical disc device |
US6549493B1 (en) * | 1998-09-14 | 2003-04-15 | Matsushita Electric Industrial Co., Ltd. | Tilt detection device, optical disc device, and tilt control method |
US7065011B2 (en) * | 2002-06-11 | 2006-06-20 | Benq Corporation | Method for adjusting mechanical error of optical disc reading device |
-
2002
- 2002-06-11 TW TW091112660A patent/TW589634B/en not_active IP Right Cessation
-
2003
- 2003-06-09 US US10/457,640 patent/US7065011B2/en not_active Expired - Fee Related
-
2006
- 2006-06-02 US US11/422,021 patent/US20060203632A1/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6549493B1 (en) * | 1998-09-14 | 2003-04-15 | Matsushita Electric Industrial Co., Ltd. | Tilt detection device, optical disc device, and tilt control method |
US6493296B1 (en) * | 1998-11-10 | 2002-12-10 | Sony Corporation | Optical disc inclination detecting method, optical pickup device, and optical disc device |
US7065011B2 (en) * | 2002-06-11 | 2006-06-20 | Benq Corporation | Method for adjusting mechanical error of optical disc reading device |
Also Published As
Publication number | Publication date |
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US20030227848A1 (en) | 2003-12-11 |
US7065011B2 (en) | 2006-06-20 |
TW589634B (en) | 2004-06-01 |
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Owner name: BENQ CORPORATION, TAIWAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:CHENG, JUNG-TSUNG;CHUANG, CHENG-CHIEH;REEL/FRAME:017715/0324 Effective date: 20030526 |
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