EP0441399A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Position displacement detecting apparatus
Assignee: Canon Inc
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Filing: 1991-02-08
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Granted: —
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Expires: 2011-02-08
Abstract
Abstract An apparatus capable of detecting a displacement of a probe from a track of a recording medium caused by track fluctuations, vibrations at recording/reproducing period. For example, a probe 1 is maintained to vibrate at frequency f in the direction perpendicular to a data train 4 at an amplitude smaller than the width of the data train 4. In this case, the amplitude of a reproduced signal of the data train changes with the displacement between the probe 1 and the data train. The envelope signal i of the reproduced signal is phase detected using as a reference signal the vibration waveform (standard signal) at frequency f o of the probe 1, to obtain a signal proportional to the displacement from the data train. Using this signal, it becomes possible to feedback control the probe 1 so as to make it trace the data train.
Inventors
- 👤 Hiroyasu Nose
- 👤 Toshihiko Miyazaki
- 👤 Takahiro Oguchi
- 👤 Kunihiro Sakai
- 👤 Toshimitsu Kawase
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 01:48
CPC Classifications
G; G11; G11B; G11B9/00; G11B9/12; G11B9/14; G11B9/1418; G11B9/1427; G11B9/1436; G11B9/1454; B; B82; B82Y; B82Y10/00
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
112 words
An apparatus for detecting a position of a probe with which an apparatus reproduces information by relatively moving the probe along a train of data bit formed on a recording medium, the data bit train being disposed in a predetermined direction and aperiodically in accordance with record information, comprising: data bit detecting means for obtaining a detection signal of said data bit with said probe relatively moving generally along said data bit; and position displacement detecting means for detecting the position displacement of said probe from said data bit train in the direction intersecting said predetermined direction, in accordance with said data bit detection signal obtained by said data bit detecting means.
Claim 2
Dependent Claim
32 words
An apparatus according to claim 1, further comprising vibrating means for giving a relative vibration in the direction intersecting said predetermined direction, to said probe relatively moving generally along said data bit.
Claim 3
Dependent Claim
63 words
An apparatus according to claim 2, wherein said position displacement detecting means comprises a synchronous rectifier circuit for phase-detecting an envelope signal of said data bit detection signal obtained by said data bit detecting means by means of said probe vibrated by said vibrating means, by using as a reference signal a vibration signal corresponding to the vibration given by said vibrating means.
Claim 4
Dependent Claim
50 words
An apparatus according to claim 3, wherein said position displacement detecting means comprises interpolating means for interpolating a signal portion corresponding to bit positions where there is no detection signal, and said synchronous rectifier circuit carries out said phase detection in accordance with a signal interpolated by said interpolating means.
Claim 5
Dependent Claim
76 words
An apparatus according to claim 4, wherein said interpolating means comprises envelope generating means for generating an envelope signal in accordance with only maximum values of a signal from said probe at the signal portion corresponding to data bits where there is said detection signal so as to interpolate the signal portion corresponding to bit positions where there is no detection signal, and said synchronous rectifier circuit phase-detects said envelope signal from said envelope generating means.
Claim 6
Dependent Claim
69 words
An apparatus according to claim 2, wherein said position displacement detecting means further comprises: means for binarizing a detection signal from said probe; polarity selecting means for selecting the polarity of said binarized signal, by using as a reference signal a vibration signal corresponding to the vibration given by said vibrating means; and an integrator for integrating a signal whose polarity having been changed by said polarity selecting means.
Claim 7
Dependent Claim
37 words
An apparatus according to claim 1, further comprising feedback controlling means for feedback controlling to move said probe in the direction intersecting said predetermined direction, in accordance with a detection result by said position displacement detecting means.
Claim 8
Independent Claim
135 words
An apparatus for detecting the position of a probe with which an apparatus reproduces information by relatively moving the probe along a train of data bit formed on a recording medium, the data bit train being disposed in a predetermined direction and aperiodically in accordance with record information, comprising: data bit detecting means for obtaining a detection signal of said data bit with said probe relatively moving generally along said data bit; interpolating means for interpolating a signal portion corresponding to bit positions where there is no detection signal, among the detection signal obtained by said data bit detecting means; and position displacement detecting means for detecting the position displacement of said probe from said data bit train in the direction intersecting said predetermined direction, in accordance with the signal interpolated by said interpolating means.
Claim 9
Dependent Claim
43 words
An apparatus according to claim 8, wherein said interpolating means interpolates the signal portion corresponding to bit positions where there is no detection signal, by holding the maximum value of said detection signal corresponding to bit positions where there is said detection signal.
Claim 10
Dependent Claim
32 words
An apparatus according to claim 9, further comprising vibrating means for giving a relative vibration in the direction intersecting said predetermined direction, to said probe relatively moving generally along said data bit.
Claim 11
Dependent Claim
62 words
An apparatus according to claim 10, wherein said interpolating means interpolates a signal from said probe given a relative vibration by said vibrating means, and said position displacement detecting means comprises a synchronous rectifier circuit for phase-detecting a signal interpolated by said interpolating means, by using as a standard signal a vibration signal corresponding to the vibration given by said vibrating means.
Claim 12
Independent Claim
196 words
An apparatus for detecting the position of a probe with which an apparatus reproduces information by relatively moving the probe along a train of data bit formed on a recording medium, the data bit train being disposed in a predetermined direction and aperiodically in accordance with record information, comprising: vibrating means for giving a relative vibration in the direction intersecting said predetermined direction, to said probe relatively moving generally along said data bit; data bit detecting means for obtaining a detection signal of said data bit with said probe given a relative vibration by said vibrating means; interpolating means for interpolating a signal portion corresponding to bit positions where there is no detection signal, among the detection signal obtained by said data bit detecting means; phase detecting means for performing a phase detection using as a reference signal a vibration signal corresponding to the vibration given by said vibrating means, in accordance with a signal interpolated by said interpolating means; and position displacement detecting means for detecting the position displacement of said probe from said data bit train in the direction intersecting said predetermined direction, in accordance with an signal outputted from said phase detecting means.
Claim 13
Dependent Claim
68 words
An apparatus according to claim 12, wherein said interpolating means performs an interpolation by holding a maximum value of a signal form said probe during the period corresponding to data bits where there is said detection signal, during the period corresponding to bit positions where there is no detection signal, and said phase detecting means performs a phase detection in accordance with a signal from said interpolating means.
Claim 14
Independent Claim
181 words
An apparatus for reproducing information by moving a probe relative to a train of data bit formed on a recording medium, the data bit train being disposed in a predetermined direction and aperiodically in accordance with record information, comprising: a probe; driving means for driving to relatively move said probe substantially along said data bit; data bit detecting means for obtaining a detection signal of said data bit with said probe relatively moved by said driving means; position displacement detecting means for detecting the position displacement of said probe from said data bit train in the direction intersecting said predetermined direction, in accordance with said data bit detection signal obtained by said data bit detecting means; and feedback controlling means for controlling the position of said probe in the direction intersecting said predetermined direction, in accordance with the detection result by said position displacement detecting means, whereby the record information in said recording medium is reproduced in accordance with said data bit detection signal obtained by said data bit detecting means using said probe position controlled by said feedback controlling means.
Claim 15
Dependent Claim
32 words
An apparatus according to claim 14, further comprising vibrating means for giving a relative vibration in the direction intersecting said predetermined direction, to said probe relatively moving generally along said data bit.
Claim 16
Dependent Claim
63 words
An apparatus according to claim 15, wherein said position displacement detecting means comprises a synchronous rectifier circuit for phase-detecting an envelope signal of said data bit detection signal obtained by said data bit detecting means by means of said probe vibrated by said vibrating means, by using as a reference signal a vibration signal corresponding to the vibration given by said vibrating means.
Claim 17
Dependent Claim
49 words
An apparatus according to claim 16, wherein said position displacement detecting means comprises interpolating means for interpolating a signal portion corresponding to bit positions where there is no detection, and said synchronous rectifier circuit carries out said phase detection in accordance with a signal interpolated by said interpolating means.
Claim 18
Dependent Claim
76 words
An apparatus according to claim 17, wherein said interpolating means comprises envelope generating means for generating an envelope signal in accordance with only maximum values of a signal from said probe at the signal portion corresponding to data bits where there is said detection signal so as to interpolate the signal portion corresponding to bit positions where there is no detection signal, and said synchronous rectifier circuit phase-detects said envelope signal from said envelope generating means.
Claim 19
Dependent Claim
69 words
An apparatus according to claim 15, wherein said position displacement detecting means further comprises: means for binarizing a detection signal from said probe; polarity selecting means for selecting the polarity of said binarized signal, by using as a reference signal a vibration signal corresponding to the vibration given by said vibrating means; and an integrator for integrating a signal whose polarity having been changed by said polarity selecting means.
Claim 20
Dependent Claim
73 words
An apparatus according to claim 14, wherein said data bit detecting means comprises voltage applying means for applying a voltage between said probe and said recording medium, and current detecting means for detecting a current flowing between said probe and said recording medium with said voltage being applied by said voltage applying means, whereby said detection signal of said data bit is obtained by detecting a current change by said current detecting means.
Claim 21
Dependent Claim
30 words
An apparatus according to claim 20, wherein said data bit detecting means obtains said detection signal of said data bit in said recording medium at an electric characteristic changed area.
Claim 22
Dependent Claim
29 words
An apparatus according to claim 20, wherein said data bit detecting means obtains said detection signal of said data bit in said recording medium at recesses or protrusions thereof.
Claim 23
Dependent Claim
21 words
An apparatus according to claim 14, further comprising information recording means for recording information in said recording medium with said probe.
Claim 24
Independent Claim
185 words
An apparatus for reproducing information by relatively moving a probe along a train of data bit formed on a recording medium, the data bit train being disposed in a predetermined direction and aperiodically in accordance with record information, comprising: a probe; a driving element for driving to relatively move said probe substantially along said data bit; a data bit detecting circuit for obtaining a detection signal of said data bit with said probe moved relatively by said driving element; a position displacement detecting circuit for detecting the position displacement of said probe from said data bit train in the direction intersecting said predetermined direction, in accordance with said data bit detection signal obtained by said data bit detecting circuit; and a feedback controlling circuit for controlling the position of said probe in the direction intersecting said predetermined direction, in accordance with the detection result by said position displacement detecting circuit, whereby the record information in said recording medium is reproduced in accordance with said data bit detection signal obtained by said data bit detecting circuit using said probe position controlled by said feedback controlling circuit.
Claim 25
Independent Claim
114 words
An apparatus for detecting the position of a probe with which an apparatus reproduces information by relatively moving the probe along a train of data bit formed on a recording medium, the data bit train being disposed in a predetermined direction and aperiodically in accordance with record information, comprising: a data bit detecting circuit for obtaining a detection signal of said data bit with said probe relatively moving generally along said data bit; and a position displacement detecting circuit for detecting the position displacement of said probe from said data bit train in the direction intersecting said predetermined direction, in accordance with said data bit detection signal obtained by said data bit detecting circuit.
Claim 26
Dependent Claim
33 words
An apparatus according to claim 25, further comprising a driving element for giving a relative vibration in the direction intersecting said predetermined direction, to said probe relatively moving generally along said data bit.
Claim 27
Dependent Claim
63 words
An apparatus according to claim 26, wherein said position displacement detecting circuit comprises a synchronous rectifier circuit for phase-detecting an envelope signal of said data bit detection signal obtained by said data bit detecting circuit by means of said probe vibrated by said driving element, by using as a reference signal a vibration signal corresponding to the vibration given by said vibrating element.
Claim 28
Dependent Claim
31 words
An apparatus according to claim 25, wherein said position displacement detecting circuit comprises an interpolating circuit for interpolating a signal portion corresponding to bit positions where there is no detection signal.
Claim 29
Dependent Claim
70 words
An apparatus according to claim 26, wherein said position displacement detecting circuit further comprises: a binarizing circuit for binarizing a detection signal from said probe; a polarity selector for selecting the polarity of said binarized signal, by using as a reference signal a vibration signal corresponding to the vibration given by said driving element; and an integrator for integrating a signal whose polarity having been changed by said polarity selector.
Claim 30
Independent Claim
108 words
A method of detecting the position of a probe for an apparatus which reproduces information by relatively moving the probe along a train of data bit formed on a recording medium, the data bit train being disposed in a predetermined direction and aperiodically in accordance with record information, said method comprising the steps of: moving said probe relative to said data bit substantially along said data bit; forming a detection signal of said data bit with said probe moving relatively; and detecting the position displacement of said probe from said data bit train in the direction intersecting said predetermined direction, in accordance with said data bit detection signal.
Claim 31
Dependent Claim
34 words
A method according to claim 30, further comprising a step of giving a relative vibration in the direction intersecting said predetermined direction, to said probe given a relative motion substantially along said data bit.
Claim 32
Dependent Claim
47 words
A method according to claim 31, wherein said position displacement detecting step comprises a step of phase-detecting an envelope signal of said data bit detection signal obtained by means of said vibrating probe, by using as a reference signal a vibration signal corresponding to said relative vibration.
Claim 33
Dependent Claim
30 words
A method according to claim 30, wherein said position displacement detecting step comprises a step of interpolating a signal portion corresponding to bit positions where there is no detection signal.
Claim 34
Dependent Claim
52 words
A method according to claim 31, wherein said position displacement detecting step further comprises the steps of binarizing said detection signal from said probe, selecting the polarity of said binarized signal using as a standard signal a vibration signal corresponding to said vibration, and integrating said signal whose polarity has been changed.
Claim 35
Independent Claim
142 words
A method of reproducing information by relatively moving a probe along a train of data bit formed on a recording medium, the data bit train being disposed in a predetermined direction and aperiodically in accordance with record information said method comprising the steps of: relatively moving said probe substantially along said data bit; forming a detection signal of said data bit with said probe moving relative to said data bit; detecting the position displacement of said probe from said data bit train in the direction intersecting said predetermined direction, in accordance with said data bit detection signal; controlling the position of said probe in the direction intersecting said predetermined direction in accordance with the detection result by said position displacement detection; and reproducing the record information in said recording medium using said data bit detection signal formed by said position controlled probe.
References Cited (Backward Citations)
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