USRE42451E1 - Method and device for generating a stable power control signal - Google Patents

Method and device for generating a stable power control signal Download PDF

Info

Publication number
USRE42451E1
USRE42451E1 US12/604,307 US60430709A USRE42451E US RE42451 E1 USRE42451 E1 US RE42451E1 US 60430709 A US60430709 A US 60430709A US RE42451 E USRE42451 E US RE42451E
Authority
US
United States
Prior art keywords
power control
read
write
control signal
level
Prior art date
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.)
Active, expires
Application number
US12/604,307
Inventor
Chin-Yin Tsai
Yi-Lin Lai
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Han Holdings LLC
Original Assignee
Han Holdings LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Han Holdings LLC filed Critical Han Holdings LLC
Priority to US12/604,307 priority Critical patent/USRE42451E1/en
Application granted granted Critical
Publication of USRE42451E1 publication Critical patent/USRE42451E1/en
Active legal-status Critical Current
Adjusted expiration legal-status Critical

Links

Images

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
    • G11B7/08—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
    • G11B7/0941—Methods and circuits for servo gain or phase compensation during operation
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/18—Error detection or correction; Testing, e.g. of drop-outs
    • 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
    • G11B7/0948—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 specially adapted for detection and avoidance or compensation of imperfections on the carrier, e.g. dust, scratches, dropouts
    • 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
    • G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
    • G11B7/126—Circuits, methods or arrangements for laser control or stabilisation
    • G11B7/1263—Power control during transducing, e.g. by monitoring
    • 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
    • G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
    • G11B7/126—Circuits, methods or arrangements for laser control or stabilisation
    • G11B7/1267—Power calibration
    • 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
    • G11B7/002—Recording, reproducing or erasing systems characterised by the shape or form of the carrier
    • G11B7/0037—Recording, reproducing or erasing systems characterised by the shape or form of the carrier with discs
    • G11B7/00375—Recording, reproducing or erasing systems characterised by the shape or form of the carrier with discs arrangements for detection of physical defects, e.g. of recording layer
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/0045—Recording

Definitions

  • the invention relates in general to a method and a device for generating a stable power control signal in a CD recorder, and more particularly to a method for controlling a power control signal of a laser diode such that the read power control voltage is automatically and dynamically adjusted as a feedback control signal varies, and a read level, an erase level and a write level of the power control signal are also automatically and dynamically adjusted as the read power control voltage varies.
  • a power control signal for controlling a laser diode may be a read level V_bias, an erase level V_erase and a write level V_write.
  • the level of the power control signal is the read level V_bias.
  • the level of the power control signal is the erase level V_erase.
  • the level of the power control signal is the write level V_write.
  • the power control signal controls the laser diode to generate a laser beam to read, erase, or write the CD-RW disk.
  • the CD-RW recorder further has a monitor diode for generating a current i M according to the intensity of the laser beam generated by the laser diode.
  • An OP amplifier processes the current i M and then generates a feedback control signal FPDO.
  • FIG. 1 shows a waveform of a feedback control signal FPDO generated when the conventional CD-RW recorder is writing.
  • the CD-RW recorder is reading the disk.
  • the CD-RW recorder is erasing the data on the disk.
  • the CD-RW recorder forms the land of the CD-RW disk.
  • the CD-RW recorder forms a pit on the disk.
  • the read level V_bias, the erase level V_erase and the write level V_write are generated by generating a read power control voltage VRDCO, a first write power control voltage VW 1 DCO and a second write power control voltage VW 2 DCO.
  • the read level V_bias equals a sum of a reference voltage Vref and the read power control voltage VRDCO
  • the erase level V_erase equals a sum of the read level V_bias and the first write power control voltage VW 1 DCO
  • the write level V_write equals a sum of the erase level V_erase and the second write power control voltage VW 2 DCO.
  • FIG. 2 is a block diagram showing a circuit for generating three power control voltages in a conventional CD recorder.
  • a read DAC (Digital-to-Analog Converter, RDAC) 202 selects one of a plurality of stored digital values, converts the selected digital value into an analog signal A 1 , and outputs the analog signal A 1 to a first low-pass filter (LPF) 204 in order to obtain the read power control voltage VRDCO.
  • LPF low-pass filter
  • a most suitable digital value may be corrected as the output of the RDAC 202 .
  • the first write power control voltage VW 1 DCO and the second write power control voltage VW 2 DCO are generated as follows.
  • the feedback control signal FPDO is inputted to a sample and hold circuit (S/H) 206 , which generates an analog signal A 2 .
  • a write target value digital-to-analog converter (WDAC) 208 selects one of the digital values and converts the selected digital value into an analog signal A 3 for output.
  • the analog signal A 2 and the analog signal A 3 are added together to obtain a sum, and then the sum is inputted to a second low-pass filter 210 to obtain a first power control voltage VW 1 DCO.
  • An amplifier 212 with the gain G amplifies the first power control voltage VW 1 DCO by G times to obtain a second power control voltage VW 2 DCO.
  • the S/II 206 samples the feedback control signal FPDO according to a pulse signal E_Pulse of FIG. 1 during the erasing operation.
  • the first power control voltage VW 1 DCO may be adjusted as the feedback control signal FPDO varies through a close loop control system composed of the S/H 206 and the second LPF 210 .
  • the read power control voltage VRDCO will change as the temperature rises after a long term usage of the recorder. At this time, the read level V_bias, the first power control voltage VW 1 DCO and the second power control voltage VW 2 DCO will shift and errors occur, and the write quality is influenced.
  • the invention achieves the above-identified object by providing a CD recorder having a power control signal.
  • the power control signal has a read level, an erase level and a write level.
  • the read level equals a sum of a reference voltage and a read power control voltage
  • the erase level equals a sum of the read level and a first write power control voltage
  • the write level equals a sum of the erase level and a second write power control voltage.
  • the CD recorder of the invention includes a pickup device, a read control circuit and a write control circuit.
  • the pickup device is for reading, erasing or writing a disk and generating a feedback control signal.
  • the pickup device includes a laser diode and a monitor diode.
  • the laser diode receives the power control signal, which enables the laser diode to generate a laser beam to read, erase or write the disk.
  • the monitor diode senses intensity of the laser beam.
  • the CD recorder generates the feedback control signal according to the intensity of the laser beam sensed by the monitor diode.
  • the read control circuit has a read target value digital-to-analog converter for storing a plurality of first digital values and converting one of the first digital values into a first analog value.
  • the read control circuit generates the read power control voltage according to the feedback control signal and the first analog value.
  • the write control circuit has a write target value digital-to-analog converter for storing a plurality of second digital values and converting one of the second digital values into a second analog value.
  • the write control circuit generates the first write power control voltage and the second write power control voltage according to the read power control voltage and the second analog value.
  • the read power control voltage is automatically and dynamically adjusted as the feedback control signal varies, such that the read level, the erase level and the write level of the power control signal are also automatically and dynamically adjusted as the read power control voltage varies.
  • FIG. 1 shows a waveform of a feedback control signal FPDO.
  • FIG. 2 is a block diagram showing a circuit for generating three power control voltages in a conventional CD recorder.
  • FIG. 3 is a block diagram showing a device of the invention for generating a stable power control signal.
  • FIG. 4 shows a waveform of a feedback control signal FPDO′.
  • FIG. 5 is a circuit block diagram showing a device of the invention for generating three power control voltages.
  • FIG. 6 is a graph showing characteristic curves of the power control voltage V.S. the light-emitting power.
  • FIG. 3 is a block diagram showing a device of the invention for generating a stable power control signal.
  • a pickup device 30 is utilized to read, erase or write a disk 40 and generate a feedback control signal FPDO′.
  • the pickup device 30 has a laser diode 301 and a monitor diode 302 .
  • the laser diode 301 receives the power control signal to enable the laser diode 301 to generate a laser beam to read, erase or write the disk 40 .
  • the pickup device 30 generates the feedback control signal FPDO′ according to the intensity of the laser beam sensed by the monitor diode 302 .
  • FIG. 5 is a circuit block diagram showing a device of the invention for generating three power control voltages.
  • a read control circuit 10 has a read target value digital-to-analog converter 404 for storing multiple first digital values and converting one of the first digital values into a first analog value A 6 .
  • the read control circuit 10 is for generating a read power control voltage VRDCO′ according to the feedback control signal FPDO′ and the first analog value A 6 .
  • a write control circuit 20 has a write target value digital-to-analog converter 410 for storing multiple second digital values and converting one of the second digital values into a second analog value A 7 .
  • the write control circuit 20 is for generating a first write power control voltage VW 1 DCO′ and a second write power control voltage VW 2 DCO′ according to the read power control voltage VRDCO′ and the second analog value A 7 .
  • the read control circuit 10 further includes a sample and hold circuit 402 , a subtracter 414 and a first low-pass filter 406 , and the write control circuit further includes an adder 416 , an amplifier 412 and a second low-pass filter 408 .
  • FIG. 4 shows a waveform of the feedback control signal FPDO′.
  • the CD recorder has a power control signal, which has a read level V_bias, an erase level V_erase and a write level V_write.
  • the read level V_bias equals a sum of the reference voltage Vref and the read power control voltage VRDCO′
  • the erase level V_erase equals a sum of the read level V_bias and the first write power control voltage VW 1 DCO′
  • the write level V_write equals a sum of the erase level V_erase and the second write power control voltage VW 2 DCO′.
  • the read level V_bias enables the laser diode to generate a read power P_bias
  • the erase level V_erase enables the laser diode to generate an erase power P_erase
  • the write level V_write enables the laser diode to generate a write power P_write.
  • the read power P_bias, the erase power P_erase and the write power P_write have to be kept constant.
  • the feedback control signal FPDO′ is inputted to the sample and hold circuit (S/H) 402 , which generates a third analog signal A 5 .
  • the read target value digital-to-analog converter (BDAC) 404 selects one of the stored digital values, and converts the selected digital values into a first analog signal A 6 for output.
  • the third analog signal A 5 is subtracted from the first analog signal A 6 to obtain a difference, which is inputted to the low-pass filter 406 to obtain the read power control voltage VRDCO′.
  • the write target value digital-to-analog converter (WDAC) 410 selects one of the stored digital values, and converts the selected digital values into a second analog signal A 7 for output.
  • the read power control voltage VRDCO′, which is inputted form the A 4 end, and the second analog signal A 7 are added together to obtain a sum, which is inputted to the low-pass filter 408 to obtain the first write power control voltage VW 1 DCO′.
  • the amplifier 412 amplifies the first write power control voltage VW 1 DCO′ by G′ times to obtain the second write power control voltage VW 2 DCO′.
  • the read power control voltage VRDCO′ is generated in a close loop control manner by feeding back the feedback control signal FPDO′.
  • the first write power control voltage VW 1 DCO′ and the second write power control voltage VW 2 DCO′ are generated in an open loop control manner.
  • FIG. 6 is a graph showing characteristic curves of the power control voltage V.S. the light-emitting power of the laser diode 301 .
  • the read level V_bias(TP 2 ) equal to (Vref+VRDCO′(TP 2 )) enables the laser diode to generate the read power P_bias
  • the erase level V_erase(TP 2 ) equal to (Vref+VRDCO′(TP 2 )+VW 1 DCO′) enables the laser diode to generate the erase power P_erase.
  • the feedback control signal FPDO′ enables the read power control voltage VRDCO′ to be adjusted to a voltage, such as VRDCO′(TP 3 ), capable of enabling the laser diode to generate the read power P_bias according to the close loop control system composed of the sample and hold circuit (S/H) 402 and the low-pass filter 406 .
  • the read level V_bias equals Vref+VRDCO′(TP 3 ).
  • the value of the first write power control voltage VW 1 DCO′ basically does not tend to vary as the temperature changes, and the relationship between VW 2 DCO′ and VW 1 DCO is only determined by the magnification power G′ of the amplifier 412 . Consequently, the erase level V_erase at this time equals (Vref+VRDCO′(TP 3 )+VW 1 DCO′).
  • the characteristic curves of the laser diode 301 have a linear zone LN. No matter how the temperature changes, the slope in the linear zone LN is kept constant. Because the erase level V_erase is still in the linear zone after it is risen to (Vref+VRDCO′(TP 3 )+VW 1 DCO′), the erase level V_erase at this time still enables the laser diode to generate the erase power P_erase.
  • the read power control voltage VRDCO′ is dynamically adjusted as the feedback control signal FPDO′ varies, and simultaneously enables the erase level V_erase and the write level V_write to be dynamically adjusted as the feedback control signal FPDO′ varies. So, the invention can dynamically adjust the read level V_bias, the erase level V_erase and the write level V_write with the temperature variation, such that the laser diode generates the constant read power P_bias, erase power P_erase and write power P_write to keep the write quality of the recorder.

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Optical Head (AREA)
  • Control Of Electric Motors In General (AREA)
  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)

Abstract

Method and device for generating a stable power control signal in a CD recorder. The power control signal for controlling a laser diode may be a read level, an erase level and a write level. A pickup device outputs a feedback control signal to a read control circuit, and a read power control voltage is thus obtained. Then, the read power control voltage is inputted to a write control circuit, which generates first and second write power control voltages. The read level equals a reference voltage added by the read power control voltage, the erase level equals the read level added by the first write power control voltage, and the write level equals the erase level added by the second write power control voltage, so the read power control voltage and thus the read, erase and write levels are automatically and dynamically adjusted as the feedback control signal varies.

Description

This applicationThis patent application is a reissue application for commonly assigned U.S. Pat. No. 7,286,462, issued Oct. 23, 2007 from U.S. patent application Ser. No. 10/990,909 which claims the benefit of the U.S. provisional application Ser. No. 60/520,711, filed Nov. 17, 2003, the subject matter of which is incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates in general to a method and a device for generating a stable power control signal in a CD recorder, and more particularly to a method for controlling a power control signal of a laser diode such that the read power control voltage is automatically and dynamically adjusted as a feedback control signal varies, and a read level, an erase level and a write level of the power control signal are also automatically and dynamically adjusted as the read power control voltage varies.
2. Description of the Related Art
When a conventional CD-RW (CD-ReWritable) recorder is writing a disk, a power control signal for controlling a laser diode may be a read level V_bias, an erase level V_erase and a write level V_write. When the recorder wants to read a CD-RW, the level of the power control signal is the read level V_bias. When the recorder is erasing data on the CD-RW disk, the level of the power control signal is the erase level V_erase. When the recorder wants to write data on the CD-RW disk, the level of the power control signal is the write level V_write. The power control signal controls the laser diode to generate a laser beam to read, erase, or write the CD-RW disk.
The CD-RW recorder further has a monitor diode for generating a current iM according to the intensity of the laser beam generated by the laser diode. An OP amplifier processes the current iM and then generates a feedback control signal FPDO. FIG. 1 shows a waveform of a feedback control signal FPDO generated when the conventional CD-RW recorder is writing. In the time slot T1, the CD-RW recorder is reading the disk. In the time slot T2, the CD-RW recorder is erasing the data on the disk. In the time slot T3, the CD-RW recorder forms the land of the CD-RW disk. In the time slot T4, the CD-RW recorder forms a pit on the disk.
In general, the read level V_bias, the erase level V_erase and the write level V_write are generated by generating a read power control voltage VRDCO, a first write power control voltage VW1DCO and a second write power control voltage VW2DCO. The read level V_bias equals a sum of a reference voltage Vref and the read power control voltage VRDCO, the erase level V_erase equals a sum of the read level V_bias and the first write power control voltage VW1DCO, and the write level V_write equals a sum of the erase level V_erase and the second write power control voltage VW2DCO.
FIG. 2 is a block diagram showing a circuit for generating three power control voltages in a conventional CD recorder. A read DAC (Digital-to-Analog Converter, RDAC) 202 selects one of a plurality of stored digital values, converts the selected digital value into an analog signal A1, and outputs the analog signal A1 to a first low-pass filter (LPF) 204 in order to obtain the read power control voltage VRDCO. In the correction process before the product is shipped out, a most suitable digital value may be corrected as the output of the RDAC 202. On the other hand, the first write power control voltage VW1DCO and the second write power control voltage VW2DCO are generated as follows. First, the feedback control signal FPDO is inputted to a sample and hold circuit (S/H) 206, which generates an analog signal A2. On the other hand, a write target value digital-to-analog converter (WDAC) 208 selects one of the digital values and converts the selected digital value into an analog signal A3 for output. The analog signal A2 and the analog signal A3 are added together to obtain a sum, and then the sum is inputted to a second low-pass filter 210 to obtain a first power control voltage VW1DCO. An amplifier 212 with the gain G amplifies the first power control voltage VW1DCO by G times to obtain a second power control voltage VW2DCO.
The S/II 206 samples the feedback control signal FPDO according to a pulse signal E_Pulse of FIG. 1 during the erasing operation. The first power control voltage VW1DCO may be adjusted as the feedback control signal FPDO varies through a close loop control system composed of the S/H 206 and the second LPF 210.
However, because the circuit for generating the read power control voltage VRDCO is an open loop control system, the read power control voltage VRDCO will change as the temperature rises after a long term usage of the recorder. At this time, the read level V_bias, the first power control voltage VW1DCO and the second power control voltage VW2DCO will shift and errors occur, and the write quality is influenced.
SUMMARY OF THE INVENTION
It is therefore an object of the invention to provide a method and a device for generating a stable power control signal, wherein the method and device can effectively improve the problem of the varying power control signal caused by the temperature variation in the long-term writing process.
The invention achieves the above-identified object by providing a CD recorder having a power control signal. The power control signal has a read level, an erase level and a write level. The read level equals a sum of a reference voltage and a read power control voltage, the erase level equals a sum of the read level and a first write power control voltage, and the write level equals a sum of the erase level and a second write power control voltage. The CD recorder of the invention includes a pickup device, a read control circuit and a write control circuit. The pickup device is for reading, erasing or writing a disk and generating a feedback control signal. The pickup device includes a laser diode and a monitor diode. The laser diode receives the power control signal, which enables the laser diode to generate a laser beam to read, erase or write the disk. The monitor diode senses intensity of the laser beam. The CD recorder generates the feedback control signal according to the intensity of the laser beam sensed by the monitor diode. The read control circuit has a read target value digital-to-analog converter for storing a plurality of first digital values and converting one of the first digital values into a first analog value. The read control circuit generates the read power control voltage according to the feedback control signal and the first analog value. The write control circuit has a write target value digital-to-analog converter for storing a plurality of second digital values and converting one of the second digital values into a second analog value. The write control circuit generates the first write power control voltage and the second write power control voltage according to the read power control voltage and the second analog value. The read power control voltage is automatically and dynamically adjusted as the feedback control signal varies, such that the read level, the erase level and the write level of the power control signal are also automatically and dynamically adjusted as the read power control voltage varies.
Other objects, features, and advantages of the invention will become apparent from the following detailed description of the preferred but non-limiting embodiments. The following description is made with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a waveform of a feedback control signal FPDO.
FIG. 2 is a block diagram showing a circuit for generating three power control voltages in a conventional CD recorder.
FIG. 3 is a block diagram showing a device of the invention for generating a stable power control signal.
FIG. 4 shows a waveform of a feedback control signal FPDO′.
FIG. 5 is a circuit block diagram showing a device of the invention for generating three power control voltages.
FIG. 6 is a graph showing characteristic curves of the power control voltage V.S. the light-emitting power.
 DETAILED DESCRIPTION OF THE INVENTION
FIG. 3 is a block diagram showing a device of the invention for generating a stable power control signal. A pickup device 30 is utilized to read, erase or write a disk 40 and generate a feedback control signal FPDO′. The pickup device 30 has a laser diode 301 and a monitor diode 302. The laser diode 301 receives the power control signal to enable the laser diode 301 to generate a laser beam to read, erase or write the disk 40. The pickup device 30 generates the feedback control signal FPDO′ according to the intensity of the laser beam sensed by the monitor diode 302.
FIG. 5 is a circuit block diagram showing a device of the invention for generating three power control voltages. A read control circuit 10 has a read target value digital-to-analog converter 404 for storing multiple first digital values and converting one of the first digital values into a first analog value A6. The read control circuit 10 is for generating a read power control voltage VRDCO′ according to the feedback control signal FPDO′ and the first analog value A6. A write control circuit 20 has a write target value digital-to-analog converter 410 for storing multiple second digital values and converting one of the second digital values into a second analog value A7. The write control circuit 20 is for generating a first write power control voltage VW1DCO′ and a second write power control voltage VW2DCO′ according to the read power control voltage VRDCO′ and the second analog value A7. The read control circuit 10 further includes a sample and hold circuit 402, a subtracter 414 and a first low-pass filter 406, and the write control circuit further includes an adder 416, an amplifier 412 and a second low-pass filter 408.
FIG. 4 shows a waveform of the feedback control signal FPDO′. The CD recorder has a power control signal, which has a read level V_bias, an erase level V_erase and a write level V_write. As shown in FIG. 4, the read level V_bias equals a sum of the reference voltage Vref and the read power control voltage VRDCO′, the erase level V_erase equals a sum of the read level V_bias and the first write power control voltage VW1DCO′, and the write level V_write equals a sum of the erase level V_erase and the second write power control voltage VW2DCO′. The read level V_bias enables the laser diode to generate a read power P_bias, the erase level V_erase enables the laser diode to generate an erase power P_erase, and the write level V_write enables the laser diode to generate a write power P_write. In order to keep the write quality, the read power P_bias, the erase power P_erase and the write power P_write have to be kept constant.
Please refer to FIG. 5. The feedback control signal FPDO′ is inputted to the sample and hold circuit (S/H) 402, which generates a third analog signal A5. The read target value digital-to-analog converter (BDAC) 404 selects one of the stored digital values, and converts the selected digital values into a first analog signal A6 for output. The third analog signal A5 is subtracted from the first analog signal A6 to obtain a difference, which is inputted to the low-pass filter 406 to obtain the read power control voltage VRDCO′.
On the other hand, the write target value digital-to-analog converter (WDAC) 410 selects one of the stored digital values, and converts the selected digital values into a second analog signal A7 for output. The read power control voltage VRDCO′, which is inputted form the A4 end, and the second analog signal A7 are added together to obtain a sum, which is inputted to the low-pass filter 408 to obtain the first write power control voltage VW1DCO′. The amplifier 412 amplifies the first write power control voltage VW1DCO′ by G′ times to obtain the second write power control voltage VW2DCO′.
In this case, the read power control voltage VRDCO′ is generated in a close loop control manner by feeding back the feedback control signal FPDO′. The first write power control voltage VW1DCO′ and the second write power control voltage VW2DCO′ are generated in an open loop control manner. Thus, when the recorder is used for a long time such that the temperature of the laser diode 301 rises, the read power control voltage VRDCO′ is automatically and dynamically adjusted as the level of the feedback control signal FPDO′ varies.
FIG. 6 is a graph showing characteristic curves of the power control voltage V.S. the light-emitting power of the laser diode 301. Taking the curve of temperature TP2 as an example, the read level V_bias(TP2) equal to (Vref+VRDCO′(TP2)) enables the laser diode to generate the read power P_bias, and the erase level V_erase(TP2) equal to (Vref+VRDCO′(TP2)+VW1DCO′) enables the laser diode to generate the erase power P_erase. When the recorder is used for a long time, the feedback control signal FPDO′ enables the read power control voltage VRDCO′ to be adjusted to a voltage, such as VRDCO′(TP3), capable of enabling the laser diode to generate the read power P_bias according to the close loop control system composed of the sample and hold circuit (S/H) 402 and the low-pass filter 406. At this time, the read level V_bias equals Vref+VRDCO′(TP3).
In this case, because the first write power control voltage VW1DCO′ is generated in an open loop control manner, the value of the first write power control voltage VW1DCO′ basically does not tend to vary as the temperature changes, and the relationship between VW2DCO′ and VW1DCO is only determined by the magnification power G′ of the amplifier 412. Consequently, the erase level V_erase at this time equals (Vref+VRDCO′(TP3)+VW1DCO′).
The characteristic curves of the laser diode 301 have a linear zone LN. No matter how the temperature changes, the slope in the linear zone LN is kept constant. Because the erase level V_erase is still in the linear zone after it is risen to (Vref+VRDCO′(TP3)+VW1DCO′), the erase level V_erase at this time still enables the laser diode to generate the erase power P_erase.
Before the product of the invention is shipped out, an optimum setting value is obtained after the first write power control voltage VW1DCO′ is corrected. When the recorder is used, the read power control voltage VRDCO′ is dynamically adjusted as the feedback control signal FPDO′ varies, and simultaneously enables the erase level V_erase and the write level V_write to be dynamically adjusted as the feedback control signal FPDO′ varies. So, the invention can dynamically adjust the read level V_bias, the erase level V_erase and the write level V_write with the temperature variation, such that the laser diode generates the constant read power P_bias, erase power P_erase and write power P_write to keep the write quality of the recorder.
While the invention has been described by way of example and in terms of a preferred embodiment, it is to be understood that the invention is not limited thereto. On the contrary, it is intended to cover various modifications and similar arrangements and procedures, and the scope of the appended claims therefore should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements and procedures.

Claims (29)

1. A CD recorder having a power control signal, which has a read level, an erase level and a write level, wherein the read level equals a sum of a reference voltage and a read power control voltage, the erase level equals a sum of the read level and a first write power control voltage, and the write level equals a sum of the erase level and a second write power control voltage, the CD recorder comprising:
a pickup device for reading, erasing or writing a disk and generating a feedback control signal, the pickup device comprising:
a laser diode for receiving the power control signal, which enables the laser diode to generate a laser beam to read, erase or write the disk; and
a monitor diode for sensing intensity of the laser beam, wherein the CD recorder generates the feedback control signal according to the intensity of the laser beam sensed by the monitor diode;
a read control circuit having a read target value digital-to-analog converter for storing a plurality of first digital values and converting one of the first digital values into a first analog value, wherein the read control circuit generates the read power control voltage according to the feedback control signal and the first analog value; and
a write control circuit having a write target value digital-to-analog converter for storing a plurality of second digital values and converting one of the second digital values into a second analog value, wherein the write control circuit generates the first write power control voltage and the second write power control voltage according to the read power control voltage and the second analog value, wherein the read power control voltage is automatically and dynamically adjusted as the feedback control signal varies, such that the read level, the erase level and the write level of the power control signal are also automatically and dynamically adjusted as the read power control voltage varies.
2. The CD recorder according to claim 1, wherein the read control circuit further has:
a sample and hold circuit for receiving the feedback control signal and obtaining a third analog value;
a subtracter for subtracting the third analog value from the first analog value and outputting a difference between the first and third analog values; and
a first low-pass filter for receiving the outputted difference of the subtracter and obtaining the read power control voltage.
3. The CD recorder according to claim 2, wherein the write control circuit further has:
an adder for adding the read power control voltage and the second analog value together to obtain a sum, and outputting the sum to a second low-pass filter so as to obtain the first write power control voltage; and
an amplifier for receiving the first write power control voltage and obtaining the second write power control voltage.
4. The CD recorder according to claim 3, wherein the read power control voltage is generated in a close loop control manner by feeding back the feedback control signal, and the first write power control voltage and the second write power control voltage are generated in an open loop control manner.
5. The CD recorder according to claim 4, wherein a magnification power exists in a relationship between the first and second write power control voltages outputted from the write control circuit.
6. The CD recorder according to claim 5, wherein the write target value digital-to-analog converter has an optimum setting value obtained after correction before the CD recorder is shipped out.
7. A method for generating a stable power control signal in a read control circuit and a write control circuit of a CD recorder, wherein the CD recorder has a laser diode and a monitor diode, the laser diode generates a laser beam to read, erase or write a disk, the CD recorder generates a feedback control signal according to intensity of the laser beam sensed by the monitor diode, the method enables the read control circuit to generate a read power control voltage and the write control circuit to generate a first write power control voltage and a second write power control voltage, the power control signal for controlling the laser diode has a read level, an erase level and a write level, the read level equals a sum of a reference voltage and the read power control voltage, the erase level equals a sum of the read level and the first write power control voltage, and the write level equals a sum of the erase level and the second write power control voltage, the method comprising the steps of:
inputting the feedback control signal to the read control circuit to obtain the read power control voltage; and
inputting the read power control voltage to the write control circuit to generate the first write power control voltage and the second write power control voltage, wherein the read power control voltage is automatically and dynamically adjusted as the feedback control signal varies, such that the read level, the erase level and the write level of the power control signal are also automatically and dynamically adjusted as the read power control voltage varies.
8. The method according to claim 7, wherein the read level enables the laser diode to generate a read power, the erase level enables the laser diode to generate an erase power, and the write level enables the laser diode to generate a write power.
9. The method according to claim 7, wherein the read power control voltage is generated in a close loop control manner by feeding back the feedback control signal, and the first write power control voltage and the second write power control voltage are generated in an open loop control manner.
10. A control device for generating a stable power control signal in a CD recorder, the CD recorder using a power control signal to access an optical disk, the power control signal having a read level, an erase level and a write level, the read level equaling a sum of a reference voltage and a read power control voltage, the erase level equaling a sum of the read level and a first write power control voltage, and the write level equaling a sum of the erase level and a second write power control voltage, the control device comprising:
a read control circuit having a read target value digital-to-analog converter for storing a plurality of first digital values and converting one of the first digital values into a first analog value, the read control circuit generating the read power control voltage according to the feedback control signal and the first analog value; and
a write control circuit having a write target value digital-to-analog converter for storing a plurality of second digital values and converting one of the second digital values into a second analog value, the write control circuit generating the first write power control voltage and the second write power control voltage according to the read power control voltage and the second analog value, wherein the read power control voltage is automatically and dynamically adjusted as the feedback control signal varies, such that the read level, the erase level and the write level of the power control signal are also automatically and dynamically adjusted as the read power control voltage varies.
11. The control device according to claim 10, wherein the read control circuit further has:
a sample and hold circuit for receiving the feedback control signal and obtaining a third analog value;
a subtracter for subtracting the third analog value from the first analog value and outputting a difference between the first and third analog values; and
a first low-pass filter for receiving the outputted difference of the subtracter and obtaining the read power control voltage.
12. The control device according to claim 11, wherein the write control circuit further has:
an adder for adding the read power control voltage and the second analog value together to obtain a sum, and outputting the sum to a second low-pass filter so as to obtain the first write power control voltage; and
an amplifier for receiving the first write power control voltage and obtaining the second write power control voltage.
13. The control device according to claim 12, wherein the read power control voltage is generated in a close loop control manner by feeding back the feedback control signal, and the first write power control voltage and the second write power control voltage are generated in an open loop control manner.
14. The control device according to claim 13, wherein a magnification power exists in a relationship between the first and second write power control voltages outputted from the write control circuit.
15. The control device according to claim 14, wherein the write target value digital-to-analog converter has an optimum setting value obtained after correction before the CD recorder is shipped out.
16. The control device according to claim 14, wherein the CD recorder comprising:
a pickup device for reading, erasing or writing the optical disk and generating a feedback control signal, the pickup device comprising:
a laser diode for receiving the power control signal, which enables the laser diode to generate a laser beam to read, erase or write the disk; and
a monitor diode for sensing intensity of the laser beam, wherein the CD recorder generates the feedback control signal according to the intensity of the laser beam sensed by the monitor diode.
17. A method for providing power control signals in an optical disk drive, comprising:
receiving a feedback control signal that is based on an intensity of a laser output of the optical disk drive;
providing a read power control signal according to the feedback control signal;
providing a first write power control signal according to the read power control signal; and
providing a second write power control signal according to the read power control signal.
18. The method according to claim 17, further comprising:
inputting the feedback control signal to a read control circuit of the optical disk drive to generate the read power control signal; and
inputting the read power control signal to a write control circuit of the optical disk drive to generate the first write power control signal and the second write power control signal.
19. The method according to claim 17, wherein the laser output has a read level, an erase level, and a write level, further wherein:
the read level equals a sum of a reference signal of the laser output and the read power control signal;
the erase level equals a sum of the read level and the first write power control signal; and
the write level equals a sum of the erase level and the second write power control signal.
20. The method according to claim 19, wherein the read power control signal is automatically and dynamically adjusted as the feedback control signal varies, such that the read level, the erase level and the write level are also automatically and dynamically adjusted as the read power control signal varies.
21. The method according to claim 19, wherein the read level enables a laser diode associated with the laser output to generate a read power, the erase level enables the laser diode to generate an erase power, and the write level enables the laser diode to generate a write power.
22. The method according to claim 17, wherein the read power control signal is generated in a close loop control manner by feeding back the feedback control signal, and the first write power control signal and the second write power control signal are generated in an open loop control manner.
23. A control device for providing power control signals in an optical disk drive, comprising:
a feedback control circuit configured to receive a feedback control signal that is based on an intensity of a laser output of the optical disk drive;
a read control circuit configured to provide a read power control signal according to the feedback control signal;
a write control circuit configured to provide a first write power control signal according to the read power control signal, and to provide a second write power control signal according to the read power control signal.
24. The control device according to claim 23, wherein the laser output has a read level, an erase level, and a write level, wherein:
the read level is approximately equal to a sum of a reference signal of the laser output and the read power control signal;
the erase level is approximately equal to a sum of the read level and the first write power control signal; and
the write level is approximately equal to a sum of the erase level and the second write power control signal.
25. The control device according to claim 24, wherein the read control circuit is configured to automatically and dynamically adjust the read power control signal as the feedback control signal varies, enabling the read level, the erase level and the write level to also be automatically and dynamically adjusted as the read power control signal varies.
26. The method according to claim 23, wherein the read control circuit generates the read power control signal in a close loop control manner by feeding back the feedback control signal, and wherein write control circuit generates the first write power control signal and the second write power control signal in an open loop control manner.
27. A control device for providing power control signals in an optical disk drive, comprising:
a feedback control means for receiving a feedback control signal that is based on an intensity of a laser output of the optical disk drive;
a read control means for providing a read power control signal according to the feedback control signal;
a write control means for providing a first write power control signal according to the read power control signal, and further to provide a second write power control signal according to the read power control signal.
28. The control device according to claim 27, wherein the laser output has a read level, an erase level, and a write level, wherein:
the read level is approximately equal to a sum of a reference signal of the laser output and the read power control signal;
the erase level is approximately equal to a sum of the read level and the first write power control signal; and
the write level is approximately equal to a sum of the erase level and the second write power control signal.
29. The control device according to claim 28, wherein the read control means automatically and dynamically adjusts the read power control signal as the feedback control signal varies, enabling the read level, the erase level and the write level to also be automatically and dynamically adjusted as the read power control signal varies.
US12/604,307 2003-11-17 2009-10-22 Method and device for generating a stable power control signal Active 2026-06-15 USRE42451E1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/604,307 USRE42451E1 (en) 2003-11-17 2009-10-22 Method and device for generating a stable power control signal

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US52071103P 2003-11-17 2003-11-17
US10/990,909 US7286462B2 (en) 2003-11-17 2004-11-17 Method and device for generating a stable power control signal
US12/604,307 USRE42451E1 (en) 2003-11-17 2009-10-22 Method and device for generating a stable power control signal

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US10/990,909 Reissue US7286462B2 (en) 2003-11-17 2004-11-17 Method and device for generating a stable power control signal

Publications (1)

Publication Number Publication Date
USRE42451E1 true USRE42451E1 (en) 2011-06-14

Family

ID=34794200

Family Applications (9)

Application Number Title Priority Date Filing Date
US10/990,665 Active 2026-05-03 US7385896B2 (en) 2003-11-17 2004-11-17 Focusing controller apparatus and method for an optical disk drive
US10/990,655 Active 2027-01-24 US7619956B2 (en) 2003-11-17 2004-11-17 stability of a write control signal
US10/990,860 Active 2026-06-22 US7646682B2 (en) 2003-11-17 2004-11-17 Focusing controller and method thereof for an optical disk drive
US10/990,805 Active 2026-05-22 US7349310B2 (en) 2003-11-17 2004-11-17 Optical disk drive for writing a re-writable optical disk and method thereof
US10/990,909 Ceased US7286462B2 (en) 2003-11-17 2004-11-17 Method and device for generating a stable power control signal
US10/990,669 Active 2026-05-13 US7298674B2 (en) 2003-11-17 2004-11-17 Method and device for adjusting a control parameter of a servo of an optical drive
US12/021,239 Expired - Lifetime US7738333B2 (en) 2003-11-17 2008-01-28 Optical disk drive for writing a re-writable optical disk and method thereof
US12/111,933 Expired - Fee Related US7778128B2 (en) 2003-11-17 2008-04-29 Focusing controller apparatus and method for an optical disk drive
US12/604,307 Active 2026-06-15 USRE42451E1 (en) 2003-11-17 2009-10-22 Method and device for generating a stable power control signal

Family Applications Before (8)

Application Number Title Priority Date Filing Date
US10/990,665 Active 2026-05-03 US7385896B2 (en) 2003-11-17 2004-11-17 Focusing controller apparatus and method for an optical disk drive
US10/990,655 Active 2027-01-24 US7619956B2 (en) 2003-11-17 2004-11-17 stability of a write control signal
US10/990,860 Active 2026-06-22 US7646682B2 (en) 2003-11-17 2004-11-17 Focusing controller and method thereof for an optical disk drive
US10/990,805 Active 2026-05-22 US7349310B2 (en) 2003-11-17 2004-11-17 Optical disk drive for writing a re-writable optical disk and method thereof
US10/990,909 Ceased US7286462B2 (en) 2003-11-17 2004-11-17 Method and device for generating a stable power control signal
US10/990,669 Active 2026-05-13 US7298674B2 (en) 2003-11-17 2004-11-17 Method and device for adjusting a control parameter of a servo of an optical drive
US12/021,239 Expired - Lifetime US7738333B2 (en) 2003-11-17 2008-01-28 Optical disk drive for writing a re-writable optical disk and method thereof
US12/111,933 Expired - Fee Related US7778128B2 (en) 2003-11-17 2008-04-29 Focusing controller apparatus and method for an optical disk drive

Country Status (3)

Country Link
US (9) US7385896B2 (en)
CN (6) CN100338664C (en)
TW (6) TWI289830B (en)

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7586822B2 (en) * 2003-07-18 2009-09-08 Mediatek Inc. Optical drive controller providing calibrated laser diode driver
CN100338664C (en) 2003-11-17 2007-09-19 威盛电子股份有限公司 Calibration method for improving stability of writing control signal during programming
TWI261226B (en) * 2004-01-20 2006-09-01 Via Tech Inc Apparatus and method of dynamic adjusting the detection window
TWI261240B (en) 2004-08-17 2006-09-01 Via Tech Inc Method for determining data storage quality of optical disc
CN100394491C (en) * 2005-06-29 2008-06-11 联发科技股份有限公司 Control circuit of optical storage device and method thereof
CN100414618C (en) * 2005-08-15 2008-08-27 上海乐金广电电子有限公司 Unit for controlling writing power inside optical recording device, and control method
US7561508B2 (en) * 2005-08-31 2009-07-14 Mediatek Inc. Method and apparatus for laser control during recording
US7729219B2 (en) * 2005-10-07 2010-06-01 Mediatek Inc. Read and write power control methods and system for optical recording device
US20070091756A1 (en) * 2005-10-24 2007-04-26 Chi-Jui Lee Method and apparatus of calibrating parameters utilized for determining servo signals
CN101051485B (en) * 2006-04-07 2010-12-29 鸿富锦精密工业（深圳）有限公司 Parameter setting system and method of optical disc machine controller
CN100552783C (en) * 2006-06-23 2009-10-21 联发科技股份有限公司 Servo Balance Calibration Device and Calibration Method for Optical Drive
CN100424764C (en) * 2006-09-30 2008-10-08 威盛电子股份有限公司 Power Control Method Based on Time Base Error Feedback
US7848208B2 (en) * 2006-10-05 2010-12-07 Panasonic Corporation Optical head device, aberration correction method and optical information processing apparatus
US20080084805A1 (en) * 2006-10-05 2008-04-10 Hon Hai Precision Industry Co., Ltd. Writing power calibrating method and data recording apparatus using the same
KR101263817B1 (en) * 2007-09-07 2013-05-13 삼성전자주식회사 control system insensitive to noise and control method
US7991030B2 (en) 2007-11-29 2011-08-02 Mediatek Inc. Method for deriving precise control over laser power of an optical pickup unit, and associated automatic power calibration circuit
TWI419156B (en) * 2009-01-09 2013-12-11 Quanta Storage Inc Method for calibrating the symmetry of a focus error signal
JP2010277658A (en) * 2009-05-29 2010-12-09 Hitachi-Lg Data Storage Inc Optical disc apparatus and program
US8009546B2 (en) * 2009-06-11 2011-08-30 Texas Instruments Incorporated Over current protection device
CN102855889B (en) * 2011-06-27 2015-03-18 晶致半导体股份有限公司 Laser diode control circuit and laser diode control device using the circuit
CN111510844B (en) * 2020-05-12 2021-09-24 无锡韦尔半导体有限公司 MEMS microphone trimming device and trimming method
CN113485200A (en) * 2021-07-30 2021-10-08 蔚来汽车科技(安徽)有限公司 Control apparatus, method, mobile equipment and storage medium for electronic device

Citations (72)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4390781A (en) 1979-06-25 1983-06-28 Olympus Optical Co. Ltd. Method and apparatus for detecting focussing error signal of objective lens
US4512004A (en) 1982-01-24 1985-04-16 Sony Corporation Apparatus for optically reproducing an information signal recorded on a record disc
US4707816A (en) 1985-03-29 1987-11-17 Hitachi, Ltd. Method and apparatus for composite wobbled and push-pull tracking servo system
US4707648A (en) 1985-11-28 1987-11-17 Fujitsu Limited Focus servomechanism control system of optical disc system having offset setting means
US4730290A (en) 1985-03-20 1988-03-08 Hitachi, Ltd. Defect detecting optical apparatus enabling recording in an alternate sector or track
JPS63117336A (en) 1986-11-04 1988-05-21 Matsushita Electric Ind Co Ltd Optical recording and reproducing device
US4878211A (en) 1986-05-26 1989-10-31 Pioneer Electronic Corporation Method and apparatus for correcting the loop gain of a servo loop in accordance with measurements during open-loop operation
US5029155A (en) 1987-11-19 1991-07-02 Olympus Optical Co., Ltd. Optical information recording/reproducing apparatus in which recording power is set prior to recording
US5146443A (en) 1990-03-13 1992-09-08 Pioneer Electronic Corporation Servo apparatus for optical disk player having both open loop coarse gain control and closed loop fine gain control
US5199015A (en) 1990-06-18 1993-03-30 Matsushita Electric Industrial Co., Ltd. Optical recording/reproducing device having means for adjusting servo loop gain and phase characteristics
US5216659A (en) 1991-09-11 1993-06-01 International Business Machines Laser power calibration by measuring laser drive current at out of focus and in focus conditions
US5245598A (en) 1990-06-27 1993-09-14 Burroughs Alan C Method and apparatus for seek operations in an optical recording system including holding a focus error signal at track crossings
US5297114A (en) 1990-11-30 1994-03-22 Asahi Kogaku Kogyo Kabushiki Kaisha Magneto-optic recording/reproduction apparatus for minimizing variation in focusing error signals caused by variation in optical source wavelength
US5367513A (en) 1993-11-05 1994-11-22 International Business Machines Corporation Focus and tracking servo decoupling system
US5475664A (en) 1993-02-05 1995-12-12 Sony Corporation Focus servo circuit apparatus with automatic bias adjustments
US5504726A (en) 1993-04-23 1996-04-02 International Business Machines Corporation Method and apparatus for calibrating focus and tracking error signals in an optical drive with measuring offsets during track jumps
US5563920A (en) 1993-02-17 1996-10-08 Zenith Electronics Corporation Method of processing variable size blocks of data by storing numbers representing size of data blocks in a fifo
US5568464A (en) 1993-11-18 1996-10-22 Olympus Optical Co., Ltd. Semiconductor laser driving apparatus utilizing three current sources to control read and write light power
US5587985A (en) 1993-03-09 1996-12-24 Matsushita Electric Industrial Co., Ltd. Signal processing device for an optical information reproducing apparatus
US5602814A (en) 1994-10-06 1997-02-11 International Business Machines Corporation Calibration of write-once disks using a single disk sector
US5623465A (en) 1991-11-06 1997-04-22 Sony Corporation Optical disk player with a digital servo-control circuit incorporating a time sharing multifunctional digital filter
US5642340A (en) 1993-06-23 1997-06-24 Sharp Kabushiki Kaisha Device for controlling focus of an optical disk apparatus
US5677935A (en) 1995-01-11 1997-10-14 Matsuhita Electric Industrial Co., Ltd. Sync detecting method and sync detecting circuit
US5703848A (en) 1994-04-05 1997-12-30 Hewlett-Packard Company Off track detection system for ruggedized optical disk drive
JPH1040546A (en) 1996-07-22 1998-02-13 Taiyo Yuden Co Ltd Method and apparatus for detecting defect of optical disk
US5732052A (en) 1994-10-05 1998-03-24 Canon Kabushiki Kaisha Optical information recording and/or reproducing apparatus capable of selecting one of focusing error signals depending upon operating mode
JPH1083540A (en) 1996-09-05 1998-03-31 Sony Corp Focus-error signal detecting method and signal reading device
US5748584A (en) 1995-03-22 1998-05-05 Nec Corporation Optical disk device having a focus offset controller
US5844920A (en) 1996-11-07 1998-12-01 Cirrus Logic, Inc. Thermal asperity compensation using multiple sync marks for retroactive and split segment data synchronization in a magnetic disk storage system
US6069855A (en) 1996-11-22 2000-05-30 Sanyo Electric Co., Ltd. Synchronous circuit and optical disk reproduction device capable of realizing more precise synchronization
US6069667A (en) 1997-02-12 2000-05-30 Matsushita Electric Industrial Co., Ltd. Synchronizing signal detecting device
US6157601A (en) 1998-01-21 2000-12-05 Media Tek Inc. Auto gain adjustment apparatus and method for focusing and tracking control of the optical pickup of an optical disc drive
JP2001067682A (en) 1999-08-30 2001-03-16 Sanyo Electric Co Ltd Optical disk device
US6269058B1 (en) 1999-01-04 2001-07-31 Texas Instruments Incorporated Wide capture range circuitry
US20010019603A1 (en) 2000-03-06 2001-09-06 Mitel Knowledge Corporation Timed schedule reminder via telephone
US20020009026A1 (en) 2000-04-28 2002-01-24 Takao Shimamura Servo control apparatus for optical disc player
US6404713B1 (en) 1999-11-16 2002-06-11 Victor Company Of Japan, Ltd. Method and apparatus for recording and reproducing information on and from optical disc
WO2002049023A2 (en) 2000-12-13 2002-06-20 Thomson Licensing S.A. Method for generating a lens position signal and corresponding apparatus for reading from and/or writing to an optical recording medium
US20020131350A1 (en) 2001-03-19 2002-09-19 Shinichi Kurobe Writing method for optical disc, processing method for information, optical disc apparatus, and information processing apparatus
US20030048707A1 (en) 2001-07-24 2003-03-13 Takayuki Ono Optical disc reproducing apparatus and tracking servo mechanism for an optical disc
US20030053387A1 (en) 2001-08-29 2003-03-20 Samsung Electronics Co., Ltd. Apparatus and method of measuring vibration quantity and method of designing loop
CN1407552A (en) 2001-09-06 2003-04-02 松下电器产业株式会社 Disc device and semiconductor integrated circuit and pick-up control method and vibration component test method
US20030147315A1 (en) 2002-02-04 2003-08-07 Nec Corporation Radial tilt compensating optical disk apparatus using tracking control loop gain
US6611123B2 (en) 2001-03-02 2003-08-26 Funai Electric Co., Ltd. Servo control apparatus and gain adjusting method
US20030169649A1 (en) 2001-03-29 2003-09-11 Munehisa Takaoka Disk drive apparatus and information reading method
US6628594B1 (en) 1999-03-05 2003-09-30 Lg Electronics Inc. Device and method for generating writing signal for optical recording medium by controlling writing power levels for different pit portions
US6633523B1 (en) 1999-04-08 2003-10-14 Fujitsu Limited Optical memory apparatus and focus servo control method
US6691203B1 (en) 2000-08-30 2004-02-10 Mosel Vitelic Corporation Integrated controller to process both optical reads and optical writes of multiple optical media
US20040037177A1 (en) 2000-12-13 2004-02-26 Christian Buchler Method for track counting and corresponding apparatus for reading from and/or writing to an optical recording medium
US20040052183A1 (en) 2002-09-18 2004-03-18 Samsung Electronics Co., Ltd. Data recording and reproducing apparatus, method, and medium including computer readable code therefor
US6731624B1 (en) 1999-03-01 2004-05-04 Sony Corporation Sync signal detection method and radio communication system
US6745167B2 (en) 2001-03-27 2004-06-01 Lite-On It Corporation Fuzzy-neuro method for discriminating optical disk type
US6757239B2 (en) 2000-09-01 2004-06-29 Matsushita Electric Industrial Co., Ltd. Optical disk having wobble patterns and block identification marks
US20040130993A1 (en) 2003-01-02 2004-07-08 Nedi Nadershahi Method and apparatus for a high speed write strategy
CN1519667A (en) 2003-01-30 2004-08-11 ������������ʽ���� Printing system, information processor and method, computer program, memory medium
US20040179451A1 (en) 2000-02-01 2004-09-16 Morito Morishima Square-wave signal modifying device, light emission control device and current supply device suitable for use in high-speed writing on recording medium
US6882611B2 (en) 2002-06-04 2005-04-19 Media Tek Inc. Method and apparatus for defect detection in optical disc drives
CN1619668A (en) 2003-11-17 2005-05-25 威盛电子股份有限公司 Focus control device and method for optical drive
US20050157606A1 (en) 2004-01-20 2005-07-21 Via Technologies, Inc. Apparatus and method of dynamic adjusting the SYNC window
US20050195717A1 (en) 2004-03-03 2005-09-08 Yi-Lin Lai Method and device for detecting the signal on a defect disc
US20050251671A1 (en) 2004-04-19 2005-11-10 Sl Ouyang Method for sampling optic disc data and apparatus thereof
US6970522B1 (en) 1999-04-16 2005-11-29 Hewlett-Packard Development Company, L.P. Data retrieval
US20060013083A1 (en) 2002-03-06 2006-01-19 Koh Young-Ok Apparatus and method for stabilizing operation of disc driver in section for setting mode conversion
US20060039252A1 (en) 2004-08-17 2006-02-23 Via Technologies, Inc. Method for detecting data defect in optical recording medium
US20060056555A1 (en) 2002-07-19 2006-03-16 Sony Corporation Syncronization signal detection apparatus and synchronization signal detection method
US7035176B2 (en) 2002-02-26 2006-04-25 Via Optical Solution, Inc. Method and device for timely outputting focusing completion signal to realize focusing condition of optical pickup head
US7095693B2 (en) 2001-03-09 2006-08-22 Sony Corporation Optical disc device and control method using preceding sub-beam to detect a disc defect
US7120100B2 (en) 2002-09-20 2006-10-10 Lite-On It Corp. Method for preventing an optical recording device from erroneous defect detecting during writing
US7149169B2 (en) 2003-11-13 2006-12-12 Mediatek Inc. Distinguishing optical disc types
US7242650B2 (en) 2003-01-23 2007-07-10 Mediatek Incorporation Apparatus and method for recovering clock signal extracted from prerecorded information in optical storage devices
US7245573B2 (en) 2002-04-17 2007-07-17 Samsung Electronics Co., Ltd. Apparatus and method for detecting sector sync signal on an optical storage medium
US20070237044A1 (en) 2004-03-31 2007-10-11 Mediatek Inc. Method for choosing the defect detection mode of an optical storage device

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62170030A (en) * 1986-01-21 1987-07-27 Sharp Corp Optical information recording and reproducing device
US4778211A (en) * 1986-07-21 1988-10-18 Gabriel Edwin Z Shovel-like, digging, scooping and transporting apparatus
US4874211A (en) * 1989-01-11 1989-10-17 Nichols Walter G Foldable utility cabinet
JPH02267734A (en) * 1989-04-07 1990-11-01 Ricoh Co Ltd Focus control device for optical disk devices
JPH03152730A (en) * 1989-11-09 1991-06-28 Matsushita Electric Ind Co Ltd tracking control device
JP3407315B2 (en) * 1992-09-30 2003-05-19 ソニー株式会社 Optical disk signal processing circuit and optical disk apparatus
US5742568A (en) * 1995-06-09 1998-04-21 Olympus Optical Co., Ltd. Tracking controller and seek controller for optical recording device
JPH10255283A (en) * 1997-03-14 1998-09-25 Sony Corp Method for controlling optical pickup and optical disk apparatus
JP3951429B2 (en) 1998-03-30 2007-08-01 Ｊｆｅスチール株式会社 Manufacturing method of high strength steel sheet with small material difference in thickness direction
JPH11328703A (en) * 1998-05-12 1999-11-30 Toshiba Corp Optical disk drive
ATE238661T1 (en) * 1998-07-30 2003-05-15 Nihon Nohyaku Co Ltd FUNGICIDE COMPOSITION CONTAINING A 1,2,3-THIADIAZOLE DERIVATIVE AND USE THEREOF
JP2001014691A (en) * 1999-06-29 2001-01-19 Matsushita Electric Ind Co Ltd Defect device of optical disk device
JP2001126201A (en) * 1999-10-21 2001-05-11 Sony Corp Defect inspecting method, defect inspecting device, signal recording and reproducing device, and signal recording medium
JP2001273649A (en) * 2000-03-27 2001-10-05 Seiko Epson Corp Servo control system and optical disk device
JP2002074667A (en) * 2000-09-04 2002-03-15 Sony Corp Disk drive device and calibration method
JP2002074693A (en) * 2000-09-05 2002-03-15 Sony Corp Optical disk recording and reproducing device and servo regulation method
TW591643B (en) * 2001-06-16 2004-06-11 Samsung Electronics Co Ltd Method and apparatus for controlling write power in an optical drive
CN1217331C (en) * 2002-09-29 2005-08-31 威盛电子股份有限公司 Read-write head output power control method for CD machine
CN1219288C (en) * 2003-03-07 2005-09-14 威盛电子股份有限公司 Write control device and method for optical storage device

Patent Citations (97)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4390781A (en) 1979-06-25 1983-06-28 Olympus Optical Co. Ltd. Method and apparatus for detecting focussing error signal of objective lens
US4512004A (en) 1982-01-24 1985-04-16 Sony Corporation Apparatus for optically reproducing an information signal recorded on a record disc
US4730290A (en) 1985-03-20 1988-03-08 Hitachi, Ltd. Defect detecting optical apparatus enabling recording in an alternate sector or track
US4707816A (en) 1985-03-29 1987-11-17 Hitachi, Ltd. Method and apparatus for composite wobbled and push-pull tracking servo system
US4707648A (en) 1985-11-28 1987-11-17 Fujitsu Limited Focus servomechanism control system of optical disc system having offset setting means
US4878211A (en) 1986-05-26 1989-10-31 Pioneer Electronic Corporation Method and apparatus for correcting the loop gain of a servo loop in accordance with measurements during open-loop operation
JPS63117336A (en) 1986-11-04 1988-05-21 Matsushita Electric Ind Co Ltd Optical recording and reproducing device
US5029155A (en) 1987-11-19 1991-07-02 Olympus Optical Co., Ltd. Optical information recording/reproducing apparatus in which recording power is set prior to recording
US5146443A (en) 1990-03-13 1992-09-08 Pioneer Electronic Corporation Servo apparatus for optical disk player having both open loop coarse gain control and closed loop fine gain control
US5199015A (en) 1990-06-18 1993-03-30 Matsushita Electric Industrial Co., Ltd. Optical recording/reproducing device having means for adjusting servo loop gain and phase characteristics
US5245598A (en) 1990-06-27 1993-09-14 Burroughs Alan C Method and apparatus for seek operations in an optical recording system including holding a focus error signal at track crossings
US5297114A (en) 1990-11-30 1994-03-22 Asahi Kogaku Kogyo Kabushiki Kaisha Magneto-optic recording/reproduction apparatus for minimizing variation in focusing error signals caused by variation in optical source wavelength
US5216659A (en) 1991-09-11 1993-06-01 International Business Machines Laser power calibration by measuring laser drive current at out of focus and in focus conditions
US5623465A (en) 1991-11-06 1997-04-22 Sony Corporation Optical disk player with a digital servo-control circuit incorporating a time sharing multifunctional digital filter
US5475664A (en) 1993-02-05 1995-12-12 Sony Corporation Focus servo circuit apparatus with automatic bias adjustments
US5563920A (en) 1993-02-17 1996-10-08 Zenith Electronics Corporation Method of processing variable size blocks of data by storing numbers representing size of data blocks in a fifo
US5587985A (en) 1993-03-09 1996-12-24 Matsushita Electric Industrial Co., Ltd. Signal processing device for an optical information reproducing apparatus
US5504726A (en) 1993-04-23 1996-04-02 International Business Machines Corporation Method and apparatus for calibrating focus and tracking error signals in an optical drive with measuring offsets during track jumps
US5642340A (en) 1993-06-23 1997-06-24 Sharp Kabushiki Kaisha Device for controlling focus of an optical disk apparatus
US5367513A (en) 1993-11-05 1994-11-22 International Business Machines Corporation Focus and tracking servo decoupling system
US5568464A (en) 1993-11-18 1996-10-22 Olympus Optical Co., Ltd. Semiconductor laser driving apparatus utilizing three current sources to control read and write light power
US5703848A (en) 1994-04-05 1997-12-30 Hewlett-Packard Company Off track detection system for ruggedized optical disk drive
US5710748A (en) 1994-04-05 1998-01-20 Hewlett-Packard Company Off track detection system and method for ruggedized optical disk drive
US5732052A (en) 1994-10-05 1998-03-24 Canon Kabushiki Kaisha Optical information recording and/or reproducing apparatus capable of selecting one of focusing error signals depending upon operating mode
US5602814A (en) 1994-10-06 1997-02-11 International Business Machines Corporation Calibration of write-once disks using a single disk sector
US5677935A (en) 1995-01-11 1997-10-14 Matsuhita Electric Industrial Co., Ltd. Sync detecting method and sync detecting circuit
US5748584A (en) 1995-03-22 1998-05-05 Nec Corporation Optical disk device having a focus offset controller
JPH1040546A (en) 1996-07-22 1998-02-13 Taiyo Yuden Co Ltd Method and apparatus for detecting defect of optical disk
JPH1083540A (en) 1996-09-05 1998-03-31 Sony Corp Focus-error signal detecting method and signal reading device
US5844920A (en) 1996-11-07 1998-12-01 Cirrus Logic, Inc. Thermal asperity compensation using multiple sync marks for retroactive and split segment data synchronization in a magnetic disk storage system
US6069855A (en) 1996-11-22 2000-05-30 Sanyo Electric Co., Ltd. Synchronous circuit and optical disk reproduction device capable of realizing more precise synchronization
US6069667A (en) 1997-02-12 2000-05-30 Matsushita Electric Industrial Co., Ltd. Synchronizing signal detecting device
US6157601A (en) 1998-01-21 2000-12-05 Media Tek Inc. Auto gain adjustment apparatus and method for focusing and tracking control of the optical pickup of an optical disc drive
US6269058B1 (en) 1999-01-04 2001-07-31 Texas Instruments Incorporated Wide capture range circuitry
US6731624B1 (en) 1999-03-01 2004-05-04 Sony Corporation Sync signal detection method and radio communication system
US6628594B1 (en) 1999-03-05 2003-09-30 Lg Electronics Inc. Device and method for generating writing signal for optical recording medium by controlling writing power levels for different pit portions
US6633523B1 (en) 1999-04-08 2003-10-14 Fujitsu Limited Optical memory apparatus and focus servo control method
US6970522B1 (en) 1999-04-16 2005-11-29 Hewlett-Packard Development Company, L.P. Data retrieval
JP2001067682A (en) 1999-08-30 2001-03-16 Sanyo Electric Co Ltd Optical disk device
US6404713B1 (en) 1999-11-16 2002-06-11 Victor Company Of Japan, Ltd. Method and apparatus for recording and reproducing information on and from optical disc
US20040179451A1 (en) 2000-02-01 2004-09-16 Morito Morishima Square-wave signal modifying device, light emission control device and current supply device suitable for use in high-speed writing on recording medium
US20010019603A1 (en) 2000-03-06 2001-09-06 Mitel Knowledge Corporation Timed schedule reminder via telephone
US20020009026A1 (en) 2000-04-28 2002-01-24 Takao Shimamura Servo control apparatus for optical disc player
US6560173B2 (en) 2000-04-28 2003-05-06 Pioneer Corporation Servo control apparatus for optical disc player
US6691203B1 (en) 2000-08-30 2004-02-10 Mosel Vitelic Corporation Integrated controller to process both optical reads and optical writes of multiple optical media
US6757239B2 (en) 2000-09-01 2004-06-29 Matsushita Electric Industrial Co., Ltd. Optical disk having wobble patterns and block identification marks
WO2002049023A2 (en) 2000-12-13 2002-06-20 Thomson Licensing S.A. Method for generating a lens position signal and corresponding apparatus for reading from and/or writing to an optical recording medium
US20040037177A1 (en) 2000-12-13 2004-02-26 Christian Buchler Method for track counting and corresponding apparatus for reading from and/or writing to an optical recording medium
CN1481553A (en) 2000-12-13 2004-03-10 ��ķ��ɭ Method for generating lens position signal and corresponding device for reading/writing optical recording medium
US6611123B2 (en) 2001-03-02 2003-08-26 Funai Electric Co., Ltd. Servo control apparatus and gain adjusting method
US7095693B2 (en) 2001-03-09 2006-08-22 Sony Corporation Optical disc device and control method using preceding sub-beam to detect a disc defect
US20020131350A1 (en) 2001-03-19 2002-09-19 Shinichi Kurobe Writing method for optical disc, processing method for information, optical disc apparatus, and information processing apparatus
US6745167B2 (en) 2001-03-27 2004-06-01 Lite-On It Corporation Fuzzy-neuro method for discriminating optical disk type
US20030169649A1 (en) 2001-03-29 2003-09-11 Munehisa Takaoka Disk drive apparatus and information reading method
US20030048707A1 (en) 2001-07-24 2003-03-13 Takayuki Ono Optical disc reproducing apparatus and tracking servo mechanism for an optical disc
US20030053387A1 (en) 2001-08-29 2003-03-20 Samsung Electronics Co., Ltd. Apparatus and method of measuring vibration quantity and method of designing loop
US6906986B2 (en) 2001-08-29 2005-06-14 Samsung Electronics Co., Ltd Apparatus and method of measuring vibration quantity and method of designing loop
CN1407552A (en) 2001-09-06 2003-04-02 松下电器产业株式会社 Disc device and semiconductor integrated circuit and pick-up control method and vibration component test method
US6934227B2 (en) 2001-09-06 2005-08-23 Matsushita Electric Industrial Co., Ltd. Optical disk device, semiconductor integrated circuit, pickup control method and vibration component detection method
US20030147315A1 (en) 2002-02-04 2003-08-07 Nec Corporation Radial tilt compensating optical disk apparatus using tracking control loop gain
US7035176B2 (en) 2002-02-26 2006-04-25 Via Optical Solution, Inc. Method and device for timely outputting focusing completion signal to realize focusing condition of optical pickup head
US7092324B2 (en) 2002-03-06 2006-08-15 Samsung Electronics Co., Ltd. Apparatus and method for stabilizing operation of disc driver in section for setting mode conversion
US20060013083A1 (en) 2002-03-06 2006-01-19 Koh Young-Ok Apparatus and method for stabilizing operation of disc driver in section for setting mode conversion
US7245573B2 (en) 2002-04-17 2007-07-17 Samsung Electronics Co., Ltd. Apparatus and method for detecting sector sync signal on an optical storage medium
US6882611B2 (en) 2002-06-04 2005-04-19 Media Tek Inc. Method and apparatus for defect detection in optical disc drives
US20060056555A1 (en) 2002-07-19 2006-03-16 Sony Corporation Syncronization signal detection apparatus and synchronization signal detection method
US20040052183A1 (en) 2002-09-18 2004-03-18 Samsung Electronics Co., Ltd. Data recording and reproducing apparatus, method, and medium including computer readable code therefor
US7120100B2 (en) 2002-09-20 2006-10-10 Lite-On It Corp. Method for preventing an optical recording device from erroneous defect detecting during writing
US20040130993A1 (en) 2003-01-02 2004-07-08 Nedi Nadershahi Method and apparatus for a high speed write strategy
US7242650B2 (en) 2003-01-23 2007-07-10 Mediatek Incorporation Apparatus and method for recovering clock signal extracted from prerecorded information in optical storage devices
CN1519667A (en) 2003-01-30 2004-08-11 ������������ʽ���� Printing system, information processor and method, computer program, memory medium
US7149169B2 (en) 2003-11-13 2006-12-12 Mediatek Inc. Distinguishing optical disc types
CN1629947A (en) 2003-11-17 2005-06-22 威盛电子股份有限公司 Focus control device and method for optical drive
TW200518081A (en) 2003-11-17 2005-06-01 Via Tech Inc Focusing controller and method thereof for an optical disk drive
US7646682B2 (en) 2003-11-17 2010-01-12 Keng-Lon Lei Focusing controller and method thereof for an optical disk drive
US7619956B2 (en) 2003-11-17 2009-11-17 Chin-Yin Tsai stability of a write control signal
US20090003163A1 (en) 2003-11-17 2009-01-01 Shih-Fang Chen Optical disk drive for writing a re-writable optical disk and method thereof
TW200522040A (en) 2003-11-17 2005-07-01 Via Tech Inc Focusing controllter and the method thereof for an optical disk drive
US20080205240A1 (en) 2003-11-17 2008-08-28 Yi-Lin Lai Focusing controller and method therof for an optical disk drive
CN1619661A (en) 2003-11-17 2005-05-25 威盛电子股份有限公司 Method and device for generating stable power control signal
CN1619660A (en) 2003-11-17 2005-05-25 威盛电子股份有限公司 A method and device for burning a rewritable optical disc
TW200518073A (en) 2003-11-17 2005-06-01 Via Tech Inc Optical disk drive of writing a re-writable optical disk and method thereof
TW200518049A (en) 2003-11-17 2005-06-01 Via Tech Inc Calibration method for improving stability of write control signal during writing
TW200518078A (en) 2003-11-17 2005-06-01 Via Tech Inc Method and device for generating a stable power control signal
TW200518048A (en) 2003-11-17 2005-06-01 Via Tech Inc Method and device for adjusting a control parameter of a servo of an optical drive
CN1619668A (en) 2003-11-17 2005-05-25 威盛电子股份有限公司 Focus control device and method for optical drive
CN1619662A (en) 2003-11-17 2005-05-25 威盛电子股份有限公司 Calibration method for improving stability of writing control signal during programming
US7385896B2 (en) 2003-11-17 2008-06-10 Tian Holdings, Llc Focusing controller apparatus and method for an optical disk drive
US7286462B2 (en) 2003-11-17 2007-10-23 Via Technologies, Inc. Method and device for generating a stable power control signal
US7298674B2 (en) 2003-11-17 2007-11-20 Via Technologies, Inc. Method and device for adjusting a control parameter of a servo of an optical drive
US7349310B2 (en) 2003-11-17 2008-03-25 Tian Holdings Llc Optical disk drive for writing a re-writable optical disk and method thereof
US20050157606A1 (en) 2004-01-20 2005-07-21 Via Technologies, Inc. Apparatus and method of dynamic adjusting the SYNC window
US20050195717A1 (en) 2004-03-03 2005-09-08 Yi-Lin Lai Method and device for detecting the signal on a defect disc
US20070237044A1 (en) 2004-03-31 2007-10-11 Mediatek Inc. Method for choosing the defect detection mode of an optical storage device
US7542390B2 (en) 2004-04-19 2009-06-02 Sl Ouyang Method for sampling optical disc data and apparatus thereof
US20050251671A1 (en) 2004-04-19 2005-11-10 Sl Ouyang Method for sampling optic disc data and apparatus thereof
US20060039252A1 (en) 2004-08-17 2006-02-23 Via Technologies, Inc. Method for detecting data defect in optical recording medium

Non-Patent Citations (32)

* Cited by examiner, † Cited by third party
Title
Ex Parte Quayle Office Action; U.S. Appl. No. 10/990,669; Mailed Jul. 13, 2007; 6 pages.
Ex Parte Quayle Office Action; U.S. Appl. No. 101990,805; Mailed Jul. 24, 2007; 7 pages.
Final Office Action; U.S. Appl. No. 10/990,665; Mailed Oct. 2, 2007; 10 pages.
Final Office Action; U.S. Appl. No. 10/990,860; Mailed Jul. 16, 2008; 7 pages.
Final Office Action; U.S. Appl. No. 10/990,860; Mailed Oct. 17, 2007; 8 pages.
Final Office Action; U.S. Appl. No. 11/021,679; Mailed Aug. 18, 2008; 13 pages.
Final Rejection; CN Application No. 2004100683527 filed Aug. 31, 2004; Applicant Via Technologies, inc.; Date of Issue Sep. 4, 2009; 13 pages.
First Office Action; Application No. TW 93135312 Filed Nov. 17, 2004; Date of Mailing: Feb. 18, 2009, 3 pages [translation attached].
Machine Translation of Okamatsu, JP-10-083540, published Mar. 31, 1998.
Non-Final Office Action; U.S. Appl. No. 10/990,860; Mailed Apr. 17, 2009; 10 pages.
Non-Final Office Action; U.S. Appl. No. 10/990,860; Mailed Dec. 9, 2008 9 pages.
Non-Final Office Action; U.S. Appl. No. 10/990,860; Mailed Feb. 11, 2008; 11 pages.
Non-Final Office Action; U.S. Appl. No. 10/990,860; Mailed Jul. 30, 2007; 9 pages.
Non-Final Office Action; U.S. Appl. No. 101990,665; Mailed Jul. 17, 2007; 21 pages.
Non-Final Office Action; U.S. Appl. No. 11/021,679; Mailed Mar. 3, 2009; 14 pages.
Non-Final Office Action; U.S. Appl. No. 11/021,679; Mailed Nov. 12, 2009; 18 pages.
Non-Final Office Action; U.S. Appl. No. 11/021,679; Mailed Nov. 14, 2007; 12 pages.
Non-Final Office Action; U.S. Appl. No. 11/205,260; Mailed Apr. 6, 2009; 8 pages.
Non-Final Office Action; U.S. Appl. No. 11/205,260; Mailed Aug. 31, 2009; 8 pages.
Notice of Allowance for U.S. Appl. No. 10/990,860; Mailed Sep. 10, 2009; 5 pages.
Notice of Allowance; U.S. Appl. No. 10/907,859; Mailed Jan. 27, 2009; 6 pages.
Notice of Allowance; U.S. Appl. No. 10/907,859; Mailed Sep. 9, 2008, 2009; 7 pages.
Notice of Allowance; U.S. Appl. No. 10/990,655; Mailed Apr. 2, 2008; 10 pages.
Notice of Allowance; U.S. Appl. No. 10/990,655; Mailed Dec. 23, 2008; 8 pages.
Notice of Allowance; U.S. Appl. No. 10/990,655; Mailed Jul. 24, 2008; 7 pages.
Notice of Allowance; U.S. Appl. No. 10/990,655; Mailed Jun. 11, 2009; 9 pages.
Notice of Allowance; U.S. Appl. No. 10/990,665; Mailed Jan. 29, 2008; 6 pages.
Notice of Allowance; U.S. Appl. No. 10/990,669; Mailed Sep. 20, 2007; 4 pages.
Notice of Allowance; U.S. Appl. No. 10/990,805; Mailed Oct. 26, 2007; 4 pages.
Notice of Allowance; U.S. Appl. No. 10/990,909; Mailed Aug. 15, 2007 (9 pgs.).
Notice of Allowance; U.S. Appl. No. 12/021,239; Mailed Dec. 16, 2009; 7 pages.
U.S. Appl. No. 12/604,307, Tsai et al.

Also Published As

Publication number Publication date
US20050105431A1 (en) 2005-05-19
US20090003163A1 (en) 2009-01-01
TWI261237B (en) 2006-09-01
TW200518073A (en) 2005-06-01
CN100338664C (en) 2007-09-19
TW200518081A (en) 2005-06-01
CN1310229C (en) 2007-04-11
US20050105416A1 (en) 2005-05-19
CN1619662A (en) 2005-05-25
TW200522040A (en) 2005-07-01
US7298674B2 (en) 2007-11-20
US7738333B2 (en) 2010-06-15
US7385896B2 (en) 2008-06-10
CN1293539C (en) 2007-01-03
US20050105412A1 (en) 2005-05-19
US7286462B2 (en) 2007-10-23
US20050105415A1 (en) 2005-05-19
US7778128B2 (en) 2010-08-17
TW200518078A (en) 2005-06-01
CN1619661A (en) 2005-05-25
TWI312996B (en) 2009-08-01
TWI308326B (en) 2009-04-01
US20080205240A1 (en) 2008-08-28
CN1619668A (en) 2005-05-25
US20050105451A1 (en) 2005-05-19
US7619956B2 (en) 2009-11-17
US7646682B2 (en) 2010-01-12
CN1619660A (en) 2005-05-25
CN1280804C (en) 2006-10-18
TW200518049A (en) 2005-06-01
US7349310B2 (en) 2008-03-25
TWI296799B (en) 2008-05-11
CN1619667A (en) 2005-05-25
TWI289830B (en) 2007-11-11
CN1305048C (en) 2007-03-14
CN1629947A (en) 2005-06-22
US20050105436A1 (en) 2005-05-19
CN1310220C (en) 2007-04-11
TW200518048A (en) 2005-06-01
TWI269272B (en) 2006-12-21

Similar Documents

Publication Publication Date Title
USRE42451E1 (en) Method and device for generating a stable power control signal
US5446716A (en) Laser power control in an optical recording system to compensate for multiple system degradations
US5309461A (en) Compensated laser drive circuit
USRE43723E1 (en) Power control circuit for optical information recording device
US7212477B2 (en) Optical recording/reproducing apparatus with APC and SPS processes
KR20060049921A (en) Laser drive method and laser drive device
US7248551B2 (en) Apparatus and method for controlling laser power for disc drive
EP1231602B1 (en) Automatic power control apparatus of an optical disc drive
US6787748B2 (en) High speed sampling circuit
US8218415B2 (en) Laser power control system and method used in optical disc writer
US7079460B2 (en) Optical power level-controlling device for stable oscillation of laser diode
KR19980078070A (en) Optical record and playback device for optimal recording power control
US20070189345A1 (en) Apparatus and method for controlling power of laser diode
US7995447B2 (en) Method for controlling read power and open-loop read control device using the same
JP2000306255A (en) Semiconductor laser driving device, driving method, and recording / reproducing device using the same
US20080084805A1 (en) Writing power calibrating method and data recording apparatus using the same
US6836126B2 (en) Offset calibration system and method of automatic power control loop
US6754156B2 (en) Recording apparatus for use with optical recording medium and method thereof
US7411885B2 (en) Method of determining the time of adjusting writing strategy of an optical drive
KR100200819B1 (en) Laser diode power control method and circuit of the optical disk system
US7778126B2 (en) Apparatus and method for controlling a recording light signal
KR100370219B1 (en) A method for calibrating threshold bandwidth of laser diode
US20040258113A1 (en) Method of determining the decay of a laser diode
US20030156521A1 (en) Optical power level-controlling device for reduced reproduction jitter
KR100587301B1 (en) Apparatus and Method for Obtaining Optimal Servo Gain in Optical Recording and Reproducing System

Legal Events

Date Code Title Description
CC Certificate of correction
FPAY Fee payment

Year of fee payment: 8

MAFP Maintenance fee payment

Free format text: PAYMENT OF MAINTENANCE FEE, 12TH YEAR, LARGE ENTITY (ORIGINAL EVENT CODE: M1553); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

Year of fee payment: 12