System and method for generating a light pattern for object illumination
A method and system for generating light pattern. The system may include: a light source providing a diverging light beam; a single lens element having first surface with a positive optical power in at least one cross section and a second surface. The second surface is configured to provide a multiplication function of the light beam in that cross section and a predefined intensity light distribution generator in a second cross section.
1. A virtual reality system comprising, in combination: a virtual reality headset;
a smartphone mounted to the virtual reality headset and having a display serving as a near-eye display of the headset; and
a body motion capture device mounted to the headset and coupled to the smartphone, the body motion capture device comprising:
an illuminator comprising a light generator system for generating a light pattern in a X-, Y-, Z-axis Cartesian coordinate system, wherein the light generator system comprises:
a light source providing a diverging light beam directed along the Z-axis;
a single lens element, said single lens element comprising:
a first surface having a positive optical power in a first cross section;
a second surface configured to provide a multiplication function of said beam in said at first cross section; and
a predefined intensity light distribution generator formed on only one of the first and second surfaces, in a second cross section which is different from the first cross section; and
an infrared camera configured to capture reflections from surfaces illuminated by the illuminator; and
a pre-processor configured to process said reflections.
2. The system according to claim 1 wherein the single lens element comprises a beam splitting element.
3. The system according to claim 2 wherein the beam splitting element is formed in a first cross section of the second surface.
4. The system according to claim 3 wherein said first cross section is a Y-Z axis cross section.
5. The system according to claim 1 wherein the positive optical power is in a Y-Z axis cross section of the first surface of the single lens element.
6. The system according to claim 1 wherein the predefined intensity light distribution generator is a line generator.
7. The system according to claim 6 wherein the line generator is in a X-Z cross section of the first surface of the single lens element.
8. The system according to claim 6 wherein the line generator is in the form of a positive optical power selected from the group consisting of:
aspheric lens, cylindrical lens, diffractive element, negative optical surface, combined negative/positive surface.
9. The system according to claim 1 wherein said light source providing a diverging laser beam is a laser source.
10. The system according to claim 1 wherein the multiplication function is obtained by a diffractive surface.