| 摘要 |
A hand-held light projector adapted to create on a remote display screen a light show presenting Lissajous figures whose patterns depend on how the projector is shaken by the operator. The projector includes a light bulb whose rays are focused to form a light beam that is directed onto a first spring-mounted mirror that when the projector is shaken, then oscillates about a horizontal axis, the beam deflected by the first mirror being cast on a second spring-mounted mirror that oscillates about a vertical axis. The beam deflected by the second mirror is cast on and scans the remote screen to produce a light trace thereon whose path is the resultant of the concurrent oscillations of the two mirrors to create on the screen Lissajous figures whose patterns depend on the frequencies and amplitudes of the oscillations.
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