Patent ID: 9203414
Filing Date: 2015-12-01
Classification: G02B,G09G,H03L,H04N

Abstract:
1. A device comprising, a mirror which is configured to oscillate in response to an oscillation signal, wherein the device is configured such that oscillation of the mirror will induce a signal; and a circuit in operable cooperation with the mirror such that an induced signal can be measured by the circuit and wherein the circuit is configured to provide an oscillation signal in relation to the measured induced signal; wherein the device is configured such that the mirror can receive the oscillation signal so that the oscillation signal is filtered due to oscillation limitations of mirror, to provide a filtered signal; wherein the device further comprises a comparator circuit for comparing the phase or amplitude of the induced signal (Y(t)) which has resulted from the oscillation of the mirror, with the phase or amplitude of the oscillating signal (X(t)) provided by the circuit, and to provide a control signal (Z(t)) which controls the circuit such that the circuit provides an oscillation signal (X(t)) which will tend to adjust the oscillation of the mirror so that the mirror tends to oscillate at the resonant frequency of the mirror, wherein the comparator circuit is configured to compare the phase of the induced signal (Y(t)) with the phase of the oscillating signal (X(t)) by coupling directly the induced signal (Y(t)) with another oscillating signal (X(t)), wherein the coupling the induced signal (Y(t)) with said oscillating signal provides an oscillating signal composed of sine-waves when the phase of induced signal (Y(t)) and oscillating signal (X(t)) are equal.