Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1990-06-08
1992-05-19
Ben, Loha
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359220, G02B 2610
Patent
active
051142171
ABSTRACT:
A light scanning system is disclosed which reduces the effects of wobble without the need for complex, cumbersome, or expensive optical equipment. A light source is provided for generating an input light beam. A rotatable support is provided, and has an axis of rotation that is substantially parallel to the input light beam. A reflector subsystem is provided, and includes a plurality of reflector pairs. Each of the reflector pairs is mounted on the support at a different azimuthal location around the axis of the rotatable support. Each of the reflector pairs has first and second light-reflective plane surfaces, the planes of which intersect at an obtuse angle. The first light-reflective surface is oriented to receive the input light beam during at least a portion of each rotational cycle of the rotatable support and to reflect the beam toward the second light-reflective surface, and the second light-reflective surface is oriented to further reflect the light beam to be approximately orthogonal to the direction of the input light beam. The disclosed structure has a scan rate and duty cycle that depends on the number of reflector pairs used.
REFERENCES:
patent: 3619039 (1971-11-01), Beiser
patent: 4084092 (1978-04-01), Runciman
patent: 4475787 (1984-10-01), Starkweather
patent: 4606601 (1986-08-01), Starkweather
patent: 4796965 (1989-01-01), Ishikawa
patent: 4936643 (1990-06-01), Beiser
Beiser, "Holographic Scanning", J. Wiley & Sons, 1988, pp. 140-143.
Kramer, "Laser Beam Deflector Cost Comparison as a Function of Performance", Holotek, pp. 1, 8, 9.
Levi, "Applied Optics", J. Wiley & Sons, 1968, cover page and p. 378.
Ben Loha
Leo Beiser Inc.
Novack Martin M.
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