Kaleidoscopic laser beam projection system
A kaleidoscopic laser beam projector (KLBP) system that employs a single moving structure to project patterns of sweeping laser beams with diverse sweep directions and emission apertures. The system comprises a collimated light source, a spinning mirror deflector (“spindle/flutter mirror”) at the center, and a stationary kaleidoscopic mirror containing multiple facet mirrors arranged in a concave fashion around the spindle mirror. As the spindle mirror rotates, it directs laser beams in a radially whirling movement toward the facet mirrors, which then subdivide these beams into multiple short strokes and redirect them outward in different directions. Various embodiments include configurations with diffractive optical elements (DOEs) for beam splitting, different kaleidoscopic mirror geometries (hexagonal, octagonal, etc.), and innovative flutter mirror mechanisms that create controlled angular variations during rotation. The system enables a “4×1” configuration that replaces traditional “4×4” systems requiring eight motors and multiple moving structures. The KLBP system offers significant advantages including mechanical simplicity, reduced size and weight, improved energy efficiency, enhanced reliability, cost-effectiveness, and modular configurability. The diverse beam incidence angles enable superior illumination of complex three-dimensional objects for applications in machine vision systems, precision metrology, gap and flushness inspection, and robot-assisted assembly of complex structures.
1. A method for projecting one or more laser beams in one or more sweeping patterns, comprising:
generating one or more laser beams from a light source;
emitting the one or more laser beams onto a rotating mirror deflector that includes one or more reflective surfaces, wherein the rotating mirror deflector is configured to rotate the one or more reflective surfaces around a spindle axis;
reflecting the one or more laser beams from the rotating mirror deflector in a radially whirling movement;
directing the one or more reflected laser beams using a plurality of facet mirrors in a concave arrangement that are positioned around the rotating mirror deflector, wherein each facet mirror reflects a portion of the radially whirling movement of the one or more laser beams and directs the reflected portion outward from the concave arrangement in one or more different sweep directions; and
projecting the one or more directed laser beams to create the one or more sweeping patterns on one or more of a remote surface or an object, wherein the one or more sweeping patterns include a diversity of different sweep directions for one or more laser beam emission apertures.
2. The method of claim 1 , wherein the one or more reflective surfaces of the rotating mirror deflector further comprise:
a flutter mirror configured to change its inclination angle during rotation.
3. The method of claim 2 , wherein the inclination angle of the flutter mirror is dynamically changed by centrifugal forces acting on an eccentric mass of the flutter mirror during rotation.
4. The method of claim 2 , wherein the inclination angle of the flutter mirror is dynamically controlled by a magnetic field generated by a voice coil positioned adjacent to the flutter mirror.
5. The method of claim 1 , further comprising:
splitting the one or more emitted laser beams into a plurality of laser beams using a diffractive optical element.
6. The method of claim 5 , wherein the diffractive optical element is embedded in one of:
the one or more reflective surfaces of the rotating mirror deflector;
the plurality of facet mirrors; or
a cylindrically shaped structure positioned around the rotating mirror deflector.
7. The method of claim 1 , wherein the concave arrangement of the plurality of facet mirrors, further comprises:
positioning each of the facet mirrors on an interior surface within an inner cavity of a stationary kaleidoscopic mirror having a hollow polygonal “cup” shape, wherein the rotating mirror deflector spins around a spindle axis located within the hollow kaleidoscopic mirror's inner cavity.
8. The method of claim 1 , wherein the one or more reflective surfaces of the rotating mirror deflector further comprises a polygonal shaped spindle mirror having a plurality of reflective sides.
9. The method of claim 1 , further comprising:
capturing reflections of the one or more projected laser beams using two or more cameras positioned to provide stereoscopic imaging of the one or more remote surface or the object.
10. The method of claim 1 , further comprising:
capturing reflections of the one or more projected laser beams using one or more of an image frame camera or an event sensor camera.
11. A laser beam projection system comprising:
one or more light sources configured to emit one or more laser beams;
a rotating mirror deflector that includes one or more reflective surfaces positioned to reflect the one or more emitted laser beams, wherein the rotating mirror deflector is attached to a spindle driven by a motor;
a hollow polygonal “cup” shaped structure having an inner cavity with a plurality of facet mirrors arranged in a concave arrangement and positioned around the rotating mirror deflector, wherein each facet mirror reflects a portion of the radially whirling movement of the one or more laser beams and directs the reflected portion outward from the concave arrangement in one or more different sweep directions; and
wherein the system is arranged to project the one or more directed laser beams to create a pattern on one or more of a remote surface or an object, and wherein the pattern is arranged to provide a diversity of different sweep directions for one or more laser beam emission apertures.
12. The system of claim 11 , wherein the one or more reflective surfaces of the rotating mirror deflector further comprise:
a flutter mirror configured to change its inclination angle during rotation.
13. The system of claim 12 , wherein the inclination angle of the flutter mirror is dynamically changed by centrifugal forces acting on an eccentric mass of the flutter mirror during rotation.
14. The system of claim 12 , further comprising:
a voice coil positioned adjacent to the flutter mirror, wherein the inclination angle of the flutter mirror is dynamically controlled by a magnetic field generated by the voice coil.
15. The system of claim 12 , further comprising:
a diffractive optical element that is employed to split the one or more emitted laser beams into a plurality of laser beams.
16. The system of claim 15 , wherein the diffractive optical element is embedded in one of:
the one or more reflective surfaces of the rotating mirror deflector;
the plurality of facet mirrors; or
a cylindrically shaped structure positioned around the rotating mirror deflector.
17. The system of claim 11 , wherein the concave arrangement of the plurality of facet mirrors, further comprises:
a motor that spins the rotating mirror deflector around a spindle axis located within the inner cavity.
18. The system of claim 11 , wherein the one or more reflective surfaces of the rotating mirror deflector further comprises:
a polygonal shaped spindle mirror having a plurality of reflective sides.
19. The system of claim 11 , further comprising:
two or more cameras that are positioned to capture stereoscopic images of captured reflections of the one or more projected laser beams from the one or more of the remote surface or the object.
20. The system of claim 11 , further comprising:
one or more of an image frame camera or an event sensor camera that are employed to capture reflections of the one or more projected laser beams from the one or more of the remote surface or the object.