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VIDEO PROJECTION APPARATUS CAPABLE OF REALIZING STABLE ROCKING ANGLE AT OPTIMUM RESONANT FREQUENCY
VIDEO PROJECTION APPARATUS CAPABLE OF REALIZING STABLE ROCKING ANGLE AT OPTIMUM RESONANT FREQUENCY
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机译:能够以最佳共振频率实现稳定的摇摆角度的视频投影设备
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摘要
A video projection apparatus includes: an optical deflector (19) having a mirror (191) projecting a first view field (F1) and projecting a second view field (F2), an actuator (193a) for rocking the mirror (191) and a sensor (197a); an optical guide unit (25) provided within the second view field (F2); a photodetector (26) ; and a control unit (14, 15, 16). The control unit (14, 15, 16) is adapted to calculate a resonant frequency (fr) of the sinusoidal-wave voltage (Vxa) ; detect a first stiming point (t0) from a sense voltage (Vxs) detect a second timing point (t1, t2, t3) from a photo detection voltage (Vpd) when the second light beam (L2) is incident to the optical guide unit (25); calculate a time, period (T) from the first timing point (t0) to the second timing point (t1); calculate a product value (P) between the time period (T) and the resonant frequency (fr) ; and control an amplitude (A) of the sinusoidal-wave voltage (Vxa).
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机译:一种视频投影设备,包括:光学偏转器(19),具有反射第一视场(F1)和第二视场(F2)的反射镜(191),用于使反射镜(191)摇摆的致动器(193a)和传感器(197a);在第二视野(F2)内设有光导单元(25)。光电探测器(26);控制单元(14、15、16)。控制单元(14、15、16)适于计算正弦波电压(V xa Sub>)的谐振频率(f r Sub>);从感测电压(V xs Sub>)检测到第一刺激点(t0)从光检测电压(V pd Sub>)检测到第二定时点(t1,t2,t3) )当第二光束(L2)入射到光导单元(25)时;计算从第一时间点(t0)到第二时间点(t1)的时间周期(T);计算时间段(T)和谐振频率(f r Sub>)之间的乘积值(P);并控制正弦波电压(V xa Sub>)的幅度(A)。
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