US3768022A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for generating phase modulated electrical signals in response to a measured angular or linear displacement
Assignee: Ernst Leitz Wetzlar GmbH
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Filing: 1972-12-04
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Granted: 1973-10-23
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Expires: 1992-12-04
Abstract
Abstract The digital output signals of an incremental path or angle measuring system are converted into phase modulated electrical signals by conducting the phase-shifted output signals via a gating circuit to the first input means of gates of which the second input means are supplied with the pulses of a generator which are phase-shifted relative to one another by a fixed degree. The signals derived from the output means of the gates are supplied to a frequency divider means and the output signals thereof represent in combination with in-phase pulses derived directly from the generator the desired phase-modulated signals.
Inventors
- 👤 K Lang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:03
CPC Classifications
H; H03; H03M; H03M1/00; H03M1/12; H03M1/124
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
196 words
Apparatus converting Digital output signals of an incremental path or angle measuring system into phase-modulated electrical signals comprising: a. means for deriving a plurality of gating signals from a pair of regularly repetitive input signals which are relatively phase-shifted to represent a measured linear or angular displacement; b. a source of regularly repetitive electrical signals connected via a phase-shift network to provide a plurality of electrical signals which are phase-shifted relative to one another; c. a plurality of gates each having input means to which is applied a respective one of the electrical signals provided by the phase-shift network; d. first and second frequency divider means having equal frequency divider ratios; a signal derived from the signal source being applied to input means of the first frequency divider means and a signal derived from output means of the gating means being applied to input means of the second frequency divider means, the gates being rendered selectively conductive by the gating signals to provide a signal at the output means of the second frequency divider means which is phase-related to a signal at the output means of the first frequency divider means to represent the measured quantity.
Claim 2
Dependent Claim
196 words
Apparatus converting Digital output signals of an incremental path or angle measuring system into phase-modulated electrical signals comprising: a. means for deriving a plurality of gating signals from a pair of regularly repetitive input signals which are relatively phase-shifted to represent a measured linear or angular displacement; b. a source of regularly repetitive electrical signals connected via a phase-shift network to provide a plurality of electrical signals which are phase-shifted relative to one another; c. a plurality of gates each having input means to which is applied a respective one of the electrical signals provided by the phase-shift network; d. first and second frequency divider means having equal frequency divider ratios; a signal derived from the signal source being applied to input means of the first frequency divider means and a signal derived from output means of the gating means being applied to input means of the second frequency divider means, the gates being rendered selectively conductive by the gating signals to provide a signal at the output means of the second frequency divider means which is phase-related to a signal at the output means of the first frequency divider means to represent the measured quantity.
Claim 3
Dependent Claim
33 words
Apparatus as claimed in claim 1, comprising waveform shaping means to render the waveform of each of the input signals substantially rectangular prior to the input signals being applied to the deriving means.
Claim 4
Dependent Claim
31 words
Apparatus as claimed in claim 1, wherein the plurality of electrical signals derived from the phase-shift network comprise four electrical signals which are successively phase-displaced through 90* relative to one another.
Claim 5
Dependent Claim
18 words
Apparatus as claimed in claim 1, wherein the phase-shift network comprises a plurality of serially connected bi-stable devices.
Claim 6
Dependent Claim
53 words
Apparatus as claimed in claim 1, wherein the gating signal deriving means comprises a pair of bi-stable devices, to respective input means of which the input signals of the pair of relatively phase-shifted input signals are applied and from the output means of which pair of bi-stable devices the gating signals are derived.
Claim 7
Dependent Claim
49 words
Apparatus as claimed in claim 5, wherein each of the bi-stable devices is provided with two input means, to a first of which a respective one of the input signals is applied directly and to a second of which the respective input signal is applied via signal inverter means.
Claim 8
Dependent Claim
32 words
Apparatus as claimed in claim 1, comprising reversible counter means connected to the output means of the first and second frequency divider means to provide a numerical indication of the measured quantity.
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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) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |