Patent US4518998A successfully refreshed from Google Patents.
US4518998A
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Method and apparatus for producing a time advanced output pulse train from an input pulse train
Assignee: OTRONICS INTERNATIONAL Inc A CORP OF
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Filing: 1982-06-03
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Granted: 1985-05-21
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Expires: 2002-06-03
Abstract
Abstract A method and apparatus for producing a time advanced pulse train from an input pulse train using a phase locked loop with time delayed feedback. The apparatus is used to generate clock signals that occur at a precise relationship to the position of a scanning or writing laser beam.
Inventors
- 👤 Andrew Warner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:04
CPC Classifications
H; H03; H03L; H03L7/00; H03L7/06; G; G06; G06K; G06K15/00; G06K15/02; G06K15/12; G06K15/1204; G06K15/1219; H04; H04N; H04N1/00; H04N1/04; H04N1/047; H04N1/053; H04N1/113; H04N1/1135; H04N2201/00; H04N2201/024; H04N2201/02406; H04N2201/02439; H04N2201/02443; H04N2201/04; H04N2201/047; H04N2201/04701; H04N2201/0471; H04N2201/04734; H04N2201/04744; H04N2201/04746; H04N2201/04753; H04N2201/04758; H04N2201/04767; H04N2201/04768; H04N2201/04772; H04N2201/04794; H04N2201/04798
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
114 words
A method for producing a time advanced output pulse train from an input pulse train comprising the steps of: (1) generating an input pulse train; (2) generating a feedback pulse train; (3) time delaying said feedback pulse train; (4) comparing the phase of said input pulse train with the phase of said time delayed feedback pulse train; (5) generating a control signal that is a function of the phase difference between said input and time delayed feedback pulse train; and, (6) adjusting the phase of said feedback pulse train in response to said control signal whereby said feedback pulse train constitutes a time advanced output pulse train with respect to said input pulse train.
Claim 2
Independent Claim
114 words
A method for producing a time advanced output pulse train from an input pulse train comprising the steps of: (1) generating an input pulse train; (2) generating a feedback pulse train; (3) time delaying said feedback pulse train; (4) comparing the phase of said input pulse train with the phase of said time delayed feedback pulse train; (5) generating a control signal that is a function of the phase difference between said input and time delayed feedback pulse train; and, (6) adjusting the phase of said feedback pulse train in response to said control signal whereby said feedback pulse train constitutes a time advanced output pulse train with respect to said input pulse train.
Claim 3
Dependent Claim
27 words
The method of claim 1 further comprising the step of dividing by N the frequency of said feedback pulse train before time delaying the feedback pulse train.
Claim 4
Dependent Claim
30 words
The method of claim 1 further comprising the step of filtering the control signal before adjusting the phase of said feedback pulse train in response to the filtered control signal.
Claim 5
Independent Claim
123 words
An apparatus for producing a time advanced output pulse train from an input pulse train comprising: (1) means for generating an input pulse train; (2) means for generating a feedback pulse train; (3) means for time delaying said feedback pulse train; (4) means for comparing the phase of said input pulse train with the phase of said time delayed feedback pulse train; (5) means for generating a control signal that is a function of the phase difference between said input and time delayed feedback pulse train; and, (6) means for adjusting the phase of said feedback pulse train in response to said control signal whereby said feedback pulse train constitutes a time advanced output pulse train with respect to said input pulse train.
Claim 6
Independent Claim
123 words
An apparatus for producing a time advanced output pulse train from an input pulse train comprising: (1) means for generating an input pulse train; (2) means for generating a feedback pulse train; (3) means for time delaying said feedback pulse train; (4) means for comparing the phase of said input pulse train with the phase of said time delayed feedback pulse train; (5) means for generating a control signal that is a function of the phase difference between said input and time delayed feedback pulse train; and, (6) means for adjusting the phase of said feedback pulse train in response to said control signal whereby said feedback pulse train constitutes a time advanced output pulse train with respect to said input pulse train.
Claim 7
Dependent Claim
31 words
The apparatus of claim 4 further comprising means for dividing by N the frequency of said feedback pulse train with said time delaying means delaying the resulting new feedback pulse train.
Claim 8
Dependent Claim
27 words
The apparatus of claim 4 further comprising means for filtering the control signal with said feedback pulse train generating means being responsive to said filtered control signal.
Claim 9
Dependent Claim
169 words
A laser beam encoder comprising: (1) laser light beam generating means; (2) an encoder means having a plurality of alternating laser light beam reflecting and absorbing elements; (3) means for scanning said laser light beam across the alternating reflecting and absorbing elements of said encoder means; (4) means responsive to the scanned laser light reflected from said encoder means for producing a pulse train signal representation thereof; (5) phase comparator means for producing a control signal that is a function of the phase difference between two input signals; (6) a feedback pulse train signal generating means responsive to said phase comparator control signal; (7) means for time delaying said feedback pulse train signal; (8) means for applying said pulse train signal as one input signal to said phase comparator; and, (9) means for applying the time delayed feedback pulse train signal to the other input of said phase comparator means whereby said feedback pulse train constitutes a time advanced output pulse train with respect to said input pulse train.
Claim 10
Dependent Claim
169 words
A laser beam encoder comprising: (1) laser light beam generating means; (2) an encoder means having a plurality of alternating laser light beam reflecting and absorbing elements; (3) means for scanning said laser light beam across the alternating reflecting and absorbing elements of said encoder means; (4) means responsive to the scanned laser light reflected from said encoder means for producing a pulse train signal representation thereof; (5) phase comparator means for producing a control signal that is a function of the phase difference between two input signals; (6) a feedback pulse train signal generating means responsive to said phase comparator control signal; (7) means for time delaying said feedback pulse train signal; (8) means for applying said pulse train signal as one input signal to said phase comparator; and, (9) means for applying the time delayed feedback pulse train signal to the other input of said phase comparator means whereby said feedback pulse train constitutes a time advanced output pulse train with respect to said input pulse train.
Claim 11
Dependent Claim
37 words
The laser light beam encoder of claim 7 further comprising means for dividing by N the frequency of said feedback pulse train signal with said time delaying means time delaying the resulting new feedback pulse train signal.
Claim 12
Dependent Claim
38 words
The laser light beam encoder of claim 7 further comprising means for filtering the control signal produced by the phase comparator means with said feedback pulse train signal generating means being responsive to the said filtered control signal.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-05-20 | 1988-11-19 | 1989-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-20 | 1992-11-19 | 1993-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-20 | 1996-11-19 | 1997-05-21 | $7700.00 | Window Closed / Lapsed |