Method and apparatus for determining a type of disk
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United States of America Patent
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Nov 7, 2006
Grant Date -
Jul 5, 2001
app pub date -
Dec 4, 2000
filing date -
Dec 2, 1999
priority date (Note) -
Expired
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Abstract
An optical recording/reproducing apparatus and method to determine a type of disk including a photodetector divided into at least two light receiving sections in a radial direction. A radial subtractor generates a radial push-pull signal from a difference between light receiving signals from a disk and received by the at least two light receiving sections, where the disk includes one of a first disk and a second disk. An upper envelope detector detects an upper envelope signal from the radial push-pull signal and a lower envelope detector detects a lower envelope signal from the radial push-pull signal. A phase comparator detects a phase difference between the upper envelope signal and the lower envelope signal. A type of disk determiner distinguishes the first disk from the second disk according to a magnitude of the phase difference and outputting a signal indicative thereof, where the second disk includes a density higher than the first disk. A servo error generator and servo controller receives the magnitude of the phase difference and the light receiving signals and outputting servo error signals. A servo driver amplifier receives the servo error signals to output a voltage to drive a spindle motor of the disk. Furthermore, a first track cross signal generator generates a first track cross signal from an envelope of an RF SUM signal, wherein the RF SUM signal is obtained by adding the light receiving signals. A second track cross signal generator generates a second track cross signal from an envelope of the radial push-pull signal. A switch selectively outputs one of the first track cross signal and the second track cross signal according to the output signal from the type of disk determiner.
First Claim
Family
- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
- 2 Other
Patent Owner(s)
- SAMSUNG ELECTRONICS CO., LTD.
International Classification(s)
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Choi, Byoung-ho | Suwon, KR | 59 | 322 |
Ma, Byung-in | Suwon, KR | 55 | 246 |
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Fee | Large entity fee | small entity fee | micro entity fee |
---|---|---|---|
Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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