VIDEO PROJECTION APPARATUS CAPABLE OF OPERATING AT OPTIMUM RESONANT FREQUENCY AND ITS CONTROLLING METHOD

VIDEO PROJECTION APPARATUS CAPABLE OF OPERATING AT OPTIMUM RESONANT FREQUENCY AND ITS CONTROLLING METHOD

A video projection apparatus includes: a light source (22); an optical deflector (19) having a mirror (191) for reflecting light (L) to project a view field (F), an actuator (193a) for rocking the mirror (191) with an axis of the mirror (191) and a sensor (197a) provided in the vicinity of the actua...

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Hauptverfasser: SAITO, Takao, IKENO, Ryohei
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
ADVERTISING
ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICESUSING STATIC MEANS TO PRESENT VARIABLE INFORMATION
CRYPTOGRAPHY
DISPLAY
EDUCATION
PHYSICS
SEALS
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creator SAITO, Takao
IKENO, Ryohei
description A video projection apparatus includes: a light source (22); an optical deflector (19) having a mirror (191) for reflecting light (L) to project a view field (F), an actuator (193a) for rocking the mirror (191) with an axis of the mirror (191) and a sensor (197a) provided in the vicinity of the actuator (193a); and a control unit (14, 15, 16). The control unit (14, 15, 16) generates a sine-wave voltage (V xa ) applied to the actuator (193a) and a cosine-wave voltage (V xa '); calculates a first convolution (X) between the sine-wave voltage (V xa ) and a sense voltage (V xsa ) from the sensor (197a); calculates a second convolution (Y) between the cosine-wave voltage (V xa ') and the sense voltage (V xsa ); converts an orthogonal coordinate formed by the first convolution (X) and the second convolution (Y) into a polar coordinate formed by a radius component (R) and an angle component ( ¸ ) and sweeps the frequency (f x ) of the first and second voltages (V xa , V xa ') so that the frequency (f x ) is defined as a resonant frequency (f r ) when the radius component (R) is maximum.
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subjects ADVERTISING
ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICESUSING STATIC MEANS TO PRESENT VARIABLE INFORMATION
CRYPTOGRAPHY
DISPLAY
EDUCATION
PHYSICS
SEALS
title VIDEO PROJECTION APPARATUS CAPABLE OF OPERATING AT OPTIMUM RESONANT FREQUENCY AND ITS CONTROLLING METHOD
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