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Chopper wheel with two axes of rotation

  • US 6,434,219 B1
  • Filed: 07/24/2001
  • Issued: 08/13/2002
  • Est. Priority Date: 07/24/2000
  • Status: Active Grant
First Claim
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1. A device for scanning a beam as a periodic function of time, the device comprising:

  • a. a wheel having an axis of rotational symmetry, the wheel being opaque to a specified energy range of electromagnetic radiation, the wheel having a set of apertures for transmitting the radiation in such a manner that the radiation is emitted in a beam from each of a specified number of illuminated apertures at a time;

    b. a first rotary actuator coupled to the wheel for rotating the wheel about a rotation axis coincident with the axis of rotational symmetry of the wheel such that the beam is scanned in a plane perpendicular to the axis of rotational symmetry of the wheel; and

    c. a second rotary actuator for rotating the wheel about a scan axis not parallel to the axis of rotational symmetry of the wheel.

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