Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1976-02-23
1977-12-13
Konick, Bernard
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
350 7, 1791003V, 250202, H04N 576, H04N 124
Patent
active
040632873
ABSTRACT:
A tracking mirror device, in particular for a video disc player, in which for following an information track on a video disc with a beam of radiation, use is made of a mirror which oscillates at a high frequency, which causes the beam of radiation, which serves for scanning the information track, to oscillate transversely to the information track at a high frequency and a small amplitude, while the filtered out high-frequency signal, as a function of its amplitude and its phase relationship with the high frequency voltage which is applied to the oscillating mirror, yields a control signal for following the information track. In accordance with the invention, use is made of an oscillating mirror which is driven electromagnetically and which is connected to oscillation compensation elements by means of springs which elements oscillate in phase opposition to the mirror. Thus, an oscillator mirror is obtained which can readily be excited to natural resonance and thus requires little power. On the mirror a piezo-electric miniature acceleration transducer can be mounted, which can provide a feedback signal so that the oscillating mirror can be included in a self-oscillating circuit.
REFERENCES:
patent: 3501586 (1970-03-01), Russell
patent: 3532408 (1970-10-01), Dostal
patent: 3882317 (1975-05-01), Camerik
patent: 3946166 (1976-03-01), Wossidlo
Cohen Simon L.
Faber Alan
Konick Bernard
Trifari Frank R.
U.S. Philips Corporation
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