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US5010541A
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US
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Apparatus having a movable portion and a fixed portion for reproducing data from an optical disk by a light beam
Assignee: Toshiba Corp
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Filing: 1988-12-23
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Granted: 1991-04-23
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Expires: 2008-12-23
Abstract
Abstract An apparatus for reproducing data from an optical disk by a light beam includes a housing which is movable in the readial direction of the optical disk. The housing includes a directing element for directing the light beam onto the optical disk, a detector for detecting the light beam from the optical disk so as to generate an electrical signal corresponding to the detected light beam, a dividing element for dividing the electrical signal generated by the detector into a low frequency component and a high frequency component, and an amplifier for amplifying the high frequency component divided by the dividing element. The reproducing apparatus further includes a moving element for moving the housing in radial direction of the optical disk, an adjuster for adjusting a distance of the directing element with respect to the optical disk in response to the low frequency component divided by the dividing element, and a reproducing circuit for reproducing data from the optical disk in response to the amplifier.
Inventors
- 👤 Ryoji Takeuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:54
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/12
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
188 words
An apparatus for reproducing stored data from an optical disk by a light beam, the apparatus having a movable portion and a fixed portion, comprising: a housing disposed on the movable portion of the apparatus and movable in a radial direction of the optical disk, said housing having means for directing the light beam onto the optical disk such that at least a portion of the light beam is reflected from the optical disk, means for detecting the light beam reflected from the optical disk and for generating an electrical signal corresponding to the detected light beam, means for dividing the electrical signal generated by the detecting means into a low frequency component and a high frequency component representative of the stored data, and means for amplifying the high frequency component; means for moving the housing in the radial direction of the optical disk; means, disposed on the fixed portion of the apparatus and responsive to the low frequency component, for adjusting a distance between the directing means and the optical disk; and means, responsive to the amplifying means, for outputting the stored data from the optical disk.
Claim 2
Independent Claim
188 words
An apparatus for reproducing stored data from an optical disk by a light beam, the apparatus having a movable portion and a fixed portion, comprising: a housing disposed on the movable portion of the apparatus and movable in a radial direction of the optical disk, said housing having means for directing the light beam onto the optical disk such that at least a portion of the light beam is reflected from the optical disk, means for detecting the light beam reflected from the optical disk and for generating an electrical signal corresponding to the detected light beam, means for dividing the electrical signal generated by the detecting means into a low frequency component and a high frequency component representative of the stored data, and means for amplifying the high frequency component; means for moving the housing in the radial direction of the optical disk; means, disposed on the fixed portion of the apparatus and responsive to the low frequency component, for adjusting a distance between the directing means and the optical disk; and means, responsive to the amplifying means, for outputting the stored data from the optical disk.
Claim 3
Dependent Claim
23 words
A reproducing apparatus according to claim 1, wherein the detecting means includes a plurality of photoelectric converters for photoelectric-converting the detected light beam.
Claim 4
Dependent Claim
31 words
A reproducing apparatus according to claim 1, wherein the dividing means comprises a filter circuit means for dividing the electrical signal into the low frequency component and the high frequency component.
Claim 5
Dependent Claim
29 words
A reproducing apparatus according to claim 3, wherein the filter circuit means includes a resistor and a capacitor for determining a band dividing frequency of the filter circuit means.
Claim 6
Dependent Claim
26 words
A reproducing apparatus according to claim 1, wherein the amplifying means comprises an operational amplifier for amplifying the high frequency component divided by the dividing means.
Claim 7
Dependent Claim
26 words
A reproducing apparatus according to claim 1, wherein the amplifying means comprises a current-voltage converter for converting the high frequency component divided by the dividing means.
Claim 8
Independent Claim
208 words
An apparatus for reproducing stored data from an optical disk by a light beam, the apparatus having a movable portion and a fixed portion, comprising: a housing disposed on the movable portion of the apparatus and movable in a radial direction of the optical disk, said housing having means for directing the light beam onto the optical disk such that at least a portion of the light beam is reflected from the optical disk, means for detecting the light beam reflected from the optical disk and for generating an electrical signal corresponding to the detected light beam, means for dividing the electrical signal generated by the detecting means into a low frequency component and a high frequency component representative of the stored data, and first amplifying means for amplifying the high frequency component; second amplifying means, disposed on the fixed portion of the apparatus, for amplifying the low frequency component and for supplying the amplified low frequency component to the first amplifying means; means, disposed on the fixed portion of the apparatus and responsive to the low frequency component, for adjusting a distance between the directing means and the optical disk; and means, responsive to the first amplifying means, for outputting the stored data from the optical disk.
Claim 9
Independent Claim
208 words
An apparatus for reproducing stored data from an optical disk by a light beam, the apparatus having a movable portion and a fixed portion, comprising: a housing disposed on the movable portion of the apparatus and movable in a radial direction of the optical disk, said housing having means for directing the light beam onto the optical disk such that at least a portion of the light beam is reflected from the optical disk, means for detecting the light beam reflected from the optical disk and for generating an electrical signal corresponding to the detected light beam, means for dividing the electrical signal generated by the detecting means into a low frequency component and a high frequency component representative of the stored data, and first amplifying means for amplifying the high frequency component; second amplifying means, disposed on the fixed portion of the apparatus, for amplifying the low frequency component and for supplying the amplified low frequency component to the first amplifying means; means, disposed on the fixed portion of the apparatus and responsive to the low frequency component, for adjusting a distance between the directing means and the optical disk; and means, responsive to the first amplifying means, for outputting the stored data from the optical disk.
Claim 10
Dependent Claim
23 words
A reproducing apparatus according to claim 7, wherein the detecting means includes a plurality of photoelectric converters for photoelectric-converting the detected light beam.
Claim 11
Dependent Claim
31 words
A reproducing apparatus according to claim 7, wherein the dividing means comprises a filter circuit means for dividing the electrical signal into the low frequency component and the high frequency component.
Claim 12
Dependent Claim
29 words
A reproducing apparatus according to claim 9, wherein the filter circuit means includes a resistor and a capacitor for determining a band dividing frequency of the filter circuit means.
Claim 13
Dependent Claim
27 words
A reproducing apparatus according to claim 7, wherein the first amplifying means comprises an operational amplifier for amplifying the high frequency component divided by the dividing means.
Claim 14
Dependent Claim
27 words
A reproducing apparatus according to claim 7, wherein the first amplifying means comprises a current-voltage converter for converting the high frequency component divided by the dividing means.
Claim 15
Independent Claim
221 words
An apparatus for reproducing stored data from an optical disk by a light beam, the apparatus having a movable portion and a fixed portion, comprising: a housing disposed on the movable portion of the apparatus and movable in a radial direction of the optical disk, said housing having means for directing the light beam onto the optical disk such that at least a portion of the light beam is reflected from the optical disk, means for detecting the light beam reflected from the optical disk and for generating an electrical signal corresponding to the detected light beam, means for dividing the electrical signal generated by the detecting means into a low frequency component and a high frequency component representative of the stored data, and first amplifying means for amplifying the high frequency component; means for moving the housing in the radial direction of the optical disk; second amplifying means, disposed on the fixed portion of the apparatus, for amplifying the low frequency component and for supplying the amplified low frequency component to the first amplifying means; means, disposed on the fixed portion of the apparatus and responsive to the low frequency component, for adjusting a distance between the directing means and the optical disk; and means, responsive to the first amplifying means, for outputting the stored data from the optical disk.
Claim 16
Independent Claim
221 words
An apparatus for reproducing stored data from an optical disk by a light beam, the apparatus having a movable portion and a fixed portion, comprising: a housing disposed on the movable portion of the apparatus and movable in a radial direction of the optical disk, said housing having means for directing the light beam onto the optical disk such that at least a portion of the light beam is reflected from the optical disk, means for detecting the light beam reflected from the optical disk and for generating an electrical signal corresponding to the detected light beam, means for dividing the electrical signal generated by the detecting means into a low frequency component and a high frequency component representative of the stored data, and first amplifying means for amplifying the high frequency component; means for moving the housing in the radial direction of the optical disk; second amplifying means, disposed on the fixed portion of the apparatus, for amplifying the low frequency component and for supplying the amplified low frequency component to the first amplifying means; means, disposed on the fixed portion of the apparatus and responsive to the low frequency component, for adjusting a distance between the directing means and the optical disk; and means, responsive to the first amplifying means, for outputting the stored data from the optical disk.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-04-22 | 1994-10-22 | 1995-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-22 | 1998-10-22 | 1999-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-22 | 2002-10-22 | 2003-04-23 | $7700.00 | Window Closed / Lapsed |