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US 4,063,287 AGranted
Tracking mirror device for a video disc player
AssigneeU.S. Philips Corporation
InventorGerard Eduard VAN Rosmalen
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AssigneeU.S. Philips Corporation
InventorGerard Eduard VAN Rosmalen
Estimating the term…
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.
A tracking mirror device for a track centering system of a video disc player, said centering system being of the type comprising deflection means including said mirror device for receiving a radiation beam and for reflecting it onto a radially selectable track of a rotating video disc in response to a deflection signal, and deflection signal generating means for sensing the position of the radiation beam with respect to said track and for providing said deflection means with a signal that periodically oscillates the radiation beam about a center position on the track;
Dependencies are inferred from the claim text.