Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1992-07-02
1993-12-28
Ben, Loha
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359290, 359846, G02B 2608
Patent
active
052744922
ABSTRACT:
A device for dynamic light spot size and shape control which is particularly suitable for vector addressing laser projectors to produce texture, more complex diagrams, and better animation. The curvature of a small reflective surface is changed by a transducer according to a signal. The reflective surface changes the waist diameter and divergence of an incident laser beam. The reflected laser beam is then scanned onto a screen by a pair of galvanometers. The size and shape of the scanning spot on the screen varies with the curvature of the reflective surface. In a preferred embodiment of the invention, the reflective surface is deposited on a piezoelectric bimorph to follow the curvature of the bimorph induced by the applied signal. In a difference embodiment of the invention, a small amplitude, high speed subscanner, is used to subscan a laser beam in x and y directions. The subscanning beam is then deflected by a low speed main x-y scanner onto a projection screen. The subscanner produces a dynamic image cell in the shape of a line diagram on the screen. The main scanner scans the dynamic image cell as a light spot with variable size and shape, or positions the dynamic image cell at different places on the screen to produce more complex diagrams and better animation.
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