Patent US3590157A successfully refreshed from Google Patents.
US3590157A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laser display system having wide deflection angle
Assignee: Zenith Electronics LLC
•
Filing: 1969-02-10
•
Granted: 1971-06-29
•
Expires: 1989-02-10
Abstract
Abstract A display system includes a beam of light that is repetitively deflected through a scanning pattern so as to define one line of an image raster. The beam deflection is a result of diffractive interaction of the beam with a train of acoustic waves that change in frequency repetitively through a range of frequencies and which are developed by a source of signals that correspondingly changes frequency repetitively. A transducer responds to those signals to develop the acoustic waves and has an input at which a capacitive reactance is presented; the effect of that reactance is to diminish the response of the transducer to the applied signals. In order at least partially to compensate that capacitive reactance, a matching network is coupled between the source and the input and includes an element which has an adjustable reactance. This element may be a saturable reactor or the like controlled so that its reactance is varied automatically to its compensatory value at each frequency as the signals change in frequency throughout their range.
Inventors
- 👤 Adrianus Korpel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:21
CPC Classifications
H; H04; H04N; H04N3/00; H04N3/02; H04N3/06; G; G02; G02F; G02F1/00; G02F1/29; G02F1/33
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
153 words
In a display system in which a beam of light is repetitively deflected through a scanning pattern by reason of diffractive interaction with a train of acoustic waves that change in frequency repetitively through a range of frequencies, a transducing system for launching said acoustic waves comprising: a source of signals repetitively changing in frequency throughout said range; a transducer responsive to said signals for developing said acoustic waves and having an input at which a capacitive reactance is presented the effect of which is to diminish the response of said transducer to said signals in said range; a matching network coupling said source to said input and including an element the reactance of which is adjustable to compensate at least partially said capacitive reactance; and means for adjusting the reactance of said element automatically to its compensatory value at each frequency as said signals change in frequency throughout said range of frequencies.
Claim 2
Dependent Claim
153 words
In a display system in which a beam of light is repetitively deflected through a scanning pattern by reason of diffractive interaction with a train of acoustic waves that change in frequency repetitively through a range of frequencies, a transducing system for launching said acoustic waves comprising: a source of signals repetitively changing in frequency throughout said range; a transducer responsive to said signals for developing said acoustic waves and having an input at which a capacitive reactance is presented the effect of which is to diminish the response of said transducer to said signals in said range; a matching network coupling said source to said input and including an element the reactance of which is adjustable to compensate at least partially said capacitive reactance; and means for adjusting the reactance of said element automatically to its compensatory value at each frequency as said signals change in frequency throughout said range of frequencies.
Claim 3
Dependent Claim
39 words
A system as defined in claim 1 in which said element is an inductor coupled in parallel with said capacitive reactance and the reactance of said inductor is varied in response to the change in frequency of said signals.
Claim 4
Dependent Claim
31 words
A system as defined in claim 2 in which said inductor comprises a saturable reactor having bias means the magnitude of which is varied in response to said change in frequency.
Claim 5
Dependent Claim
56 words
A system as defined in claim 3 in which said inductor exhibits a nonlinear frequency-change characteristic, in which said adjusting means responds to an applied control signal, and in which said matching network includes means for shaping said control signal to change the reactance of said inductor effectively linearly in proportion to said change in frequency.
Claim 6
Dependent Claim
43 words
A system as defined in claim 1 in which said element includes, in parallel with said capacitive reactance, the parallel combination of an inductor and a capacitor the capacitance of which is varied in response to the change of frequency of said signals.
Claim 7
Dependent Claim
61 words
A system as defined in claim 1 which displays a television image by means of said repetitive deflection effectively across an image raster, in which said television image is transmitted as the video portion of a composite television program signal and in which said composite signal includes a synchronizing component to which said source responds for synchronously developing said repetitively-changing signals.
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) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |