US4293195A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Simultaneous multi-beam optical modulation system
Assignee: Ricoh Co Ltd
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Filing: 1979-10-17
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Granted: 1981-10-06
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Expires: 1999-10-17
Abstract
Abstract The simultaneous multi-beam optical modulation process comprises the steps of obtaining a plurality of modulated signals with the amplitude of carriers having different frequencies modulated by a plurality of signals, and driving an acoustic optical element by the modulated signals so that a light modulation is performed by the acoustic optical element. In this system, a dummy signal is produced by squaring a plurality of the signals and adding and then inverting the squared signals and a setting voltage for setting an overall deflection efficiency of the acoustic optical element, or by adding and then inverting a plurality of the signals and the setting voltage and then squaring the sum. The amplitude of an assigned carrier is modulated by the dummy signal and a modulated output is obtained. The modulated output and the modulated signals are summed up into a summed-up signal, which is then applied to the acoustic optical system. An apparatus for carrying out the process is also described.
Inventors
- 👤 Masaaki Mori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:33
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/11; G02F1/113
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
132 words
In a simultaneous multi-beam optical modulation process of the type having the steps of obtaining a plurality of modulated signals with the amplitude of carriers having different frequencies modulated by a plurality of signals, and driving an acoustic optical element by said modulated signals, whereby a light modulation is performed by the acoustic optical element, the improvement comprising the steps of producing a dummy signal by squaring a plurality of said signals, adding and then inverting said squared signals and a setting voltage for setting an overall deflection efficiency of the acoustic optical element, modulating the amplitude of an assigned carrier by said dummy signal to obtain a modulated output, summing said modulated output and said modulated signals into a summed signal, and applying said summed signal to the acoustic optical element.
Claim 2
Dependent Claim
132 words
In a simultaneous multi-beam optical modulation process of the type having the steps of obtaining a plurality of modulated signals with the amplitude of carriers having different frequencies modulated by a plurality of signals, and driving an acoustic optical element by said modulated signals, whereby a light modulation is performed by the acoustic optical element, the improvement comprising the steps of producing a dummy signal by squaring a plurality of said signals, adding and then inverting said squared signals and a setting voltage for setting an overall deflection efficiency of the acoustic optical element, modulating the amplitude of an assigned carrier by said dummy signal to obtain a modulated output, summing said modulated output and said modulated signals into a summed signal, and applying said summed signal to the acoustic optical element.
Claim 3
Dependent Claim
131 words
In a simultaneous multi-beam optical modulation process of the type having the steps of obtaining a plurality of modulated signals with the amplitude of carriers having different frequencies modulated by a plurality of signals, and driving an acoustic optical element by said modulated signals, whereby a light modulation is performed by the acoustic optical element, the improvement comprising the steps of producing a dummy signal by adding and then inverting a plurality of the signals and a setting voltage for setting an overall deflection efficiency of the acoustic optical element, then squaring said sum, modulating the amplitude of an assigned carrier by said dummy signal to obtain a modulated output, summing said modulated output and said modulated signals into a summed signal, and applying said summed signal to said acoustic element.
Claim 4
Dependent Claim
131 words
In a simultaneous multi-beam optical modulation process of the type having the steps of obtaining a plurality of modulated signals with the amplitude of carriers having different frequencies modulated by a plurality of signals, and driving an acoustic optical element by said modulated signals, whereby a light modulation is performed by the acoustic optical element, the improvement comprising the steps of producing a dummy signal by adding and then inverting a plurality of the signals and a setting voltage for setting an overall deflection efficiency of the acoustic optical element, then squaring said sum, modulating the amplitude of an assigned carrier by said dummy signal to obtain a modulated output, summing said modulated output and said modulated signals into a summed signal, and applying said summed signal to said acoustic element.
Claim 5
Dependent Claim
132 words
An improved simultaneous multi-beam optical modulation process of the type in which a light modulation is performed by an acoustic optical element comprising the steps of modulating the amplitude of each of a plurality of carriers having different frequencies by applying a respective modulator signal thereto to obtain a plurality of modulated signals, squaring an input voltage of said plurality of modulation signals, adding and then inverting said square voltage of said modulator signals and a setting voltage for setting an overall deflection efficiency of the acoustic optical element to produce a dummy signal, modulating the amplitude of an assigned carrier by said dummy signal to obtain a modulated output, summing said modulated output and said modulated signals into a summed signal, and applying said summed signal to the acoustic optical element.
Claim 6
Dependent Claim
132 words
An improved simultaneous multi-beam optical modulation process of the type in which a light modulation is performed by an acoustic optical element comprising the steps of modulating the amplitude of each of a plurality of carriers having different frequencies by applying a respective modulator signal thereto to obtain a plurality of modulated signals, squaring an input voltage of said plurality of modulation signals, adding and then inverting said square voltage of said modulator signals and a setting voltage for setting an overall deflection efficiency of the acoustic optical element to produce a dummy signal, modulating the amplitude of an assigned carrier by said dummy signal to obtain a modulated output, summing said modulated output and said modulated signals into a summed signal, and applying said summed signal to the acoustic optical element.
Claim 7
Dependent Claim
130 words
An improved simultaneous multi-beam optical modulation process of the type in which a light modulation is performed by an acoustic optical element comprising the steps of modulating the amplitude of each of a plurality of carriers having different frequencies by applying a respective modulator signal thereto to obtain a plurality of modulated signals, adding and then inverting an input voltage of a plurality of said modulator signals and a setting voltage for setting an overall deflection efficiency of the acoustic optical element, then squaring said added and inverted modulated signals to produce a dummy signal, modulating the amplitude of an assigned carrier by said dummy signal to obtain a modulated output, summing said modulated output signals into a summed signal, and applying said summed signal to the acoustic optical element.
Claim 8
Dependent Claim
130 words
An improved simultaneous multi-beam optical modulation process of the type in which a light modulation is performed by an acoustic optical element comprising the steps of modulating the amplitude of each of a plurality of carriers having different frequencies by applying a respective modulator signal thereto to obtain a plurality of modulated signals, adding and then inverting an input voltage of a plurality of said modulator signals and a setting voltage for setting an overall deflection efficiency of the acoustic optical element, then squaring said added and inverted modulated signals to produce a dummy signal, modulating the amplitude of an assigned carrier by said dummy signal to obtain a modulated output, summing said modulated output signals into a summed signal, and applying said summed signal to the acoustic optical element.
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) | 1984-10-05 | 1985-04-06 | 1985-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-05 | 1989-04-06 | 1989-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-05 | 1993-04-06 | 1993-10-06 | $7700.00 | Window Closed / Lapsed |