Method and Device for Staircase Scanning of a Light Beam
Original Publication Date: 1985-Dec-01
Included in the Prior Art Database: 2005-Feb-19
There has been found a device and method for producing a "staircase" scan of a light beam or a laser beam, i.e., where the beam remains fixed at one spot for a finite time, jumps quickly to a new spot, and remains there for a fixed time before jumping again, etc. The device consists of a rotating mirror R (or a mirror on a resonant galvanometer) with a constant angular velocity and a special fixed mirror pair for each spot i on the focal plane at which the beam must remain fixed. Each pair of fixed mirrors consists of a flat mirror Mi and a mirror Ei that is a section of an elliptical cylinder. As the rotating mirror rotates, the reflected beam traces a certain angular range in space.