Optical arrangement of adaptive illumination system with variable illuminating angle and VCM motor
A method and apparatus for illuminating at least one object appearing in a field of view (FOV). An illumination system includes an illumination source configured to provide illumination to illuminate a target of the object. A collimating lens is configured to collimate the illumination and to provide the illumination to a fixed multiple lens array (MLA). The fixed multiple lens array provides the illumination to a movable MLA. The movable MLA is configured to provide the illumination to the target to illuminate the target. The position of the movable MLA may be adjusted to alter the illumination full field angle.
1. An optical assembly for an adaptive illumination system, the optical assembly comprising:
an illumination source configured to provide light along an optical axis to provide illumination to a target, wherein the illumination has an illumination full field angle;
a collimating lens disposed along the optical axis and configured to receive the light from the illumination source and further configured to collimate the light;
a fixed multiple lens array disposed along the optical axis and configured to receive the light from the collimating lens; and
a movable multiple lens array disposed along the optical axis and configured to receive the light from the fixed lens array, wherein the position of the movable multiple lens array is adjustable and the position of the movable lens array may be adjusted to change the illumination full field angle.
2. The optical assembly of claim 1 , further comprising a motor physically coupled to the movable multiple lens array and configured to adjust the position of the movable multiple lens array.
3. The optical assembly of claim 2 , wherein the motor is a voice coil motor.
4. The optical assembly of claim 1 , wherein the movable multiple lens array has a travel distance of between 0.2 and 1 millimeter.
5. The optical assembly of claim 1 , wherein the illuminating full field angle can be changed from 24 degrees to 46 degrees.
6. The optical assembly of claim 1 , wherein the illuminating full field angle is less than 50 degrees.
7. The optical assembly of claim 1 , wherein the illumination source is a light emitting diode.
8. The optical assembly of claim 1 , wherein the collimating lens has a first surface along the optical axis and a second surface along the optical axis and wherein the first surface is a planar surface and the second surface is a convex surface having a positive optical power, index of refraction between 1.4 and 2, and am Abbe value of between 20 and 70.
9. The optical assembly of claim 1 , wherein the fixed multiple lens array comprises a first surface along the optical axis and a second surface along the optical axis, and wherein the first surface is a planar surface and the second surface comprises a plurality of lens cells.
10. The optical assembly of claim 9 , wherein the plurality of lens cells comprises a plurality of convex lens cells having a lens cell size of approximately 0.4 millimeters by 0.5 millimeters.
11. The optical assembly of claim 1 , wherein the fixed multiple lens array comprises a plastic material.
12. The optical assembly of claim 1 , wherein the movable multiple lens array comprises a first surface along the optical axis and a second surface along the optical axis, and wherein the first surface comprises a plurality of lens cells and the second surface comprises a planar surface.
13. The optical assembly of claim 12 , wherein the plurality of lens cells comprises a plurality of convex lens cells having a lens cell size of approximately 0.4 millimeters by 0.5 millimeters.
14. The optical assembly of claim 1 , wherein the movable multiple lens array comprises a plastic material.
15. The optical assembly of claim 1 , further comprising a third multiple lens array disposed along the optical axis configured to receive the light from the movable multiple lens array, and wherein the third multiple lens array is further configured to provide the light to the target.
16. The optical assembly of claim 15 , wherein the third fixed multiple lens array comprises a first surface along the optical axis and a second surface along of the optical axis, and wherein the first surface comprises a plurality of concave lenses and the second surface comprises a planar surface.
17. The optical assembly of claim 15 , further comprising a motor physically coupled to the third multiple lens array configured to adjust the position of the third multiple lens array.
18. The optical assembly of claim 17 , wherein the motor is an actuator, a voice coil motor, a piezoelectric device, or a microelectromechanical systems (MEMS) motor.
19. The optical assembly of claim 1 , wherein the movable lens array comprises a first surface along the optical axis and a second surface along the optical axis, and wherein the first surface of the movable lens array comprises a plurality of convex lenses and the second surface of the movable lens array comprises a plurality of convex lenses.
20. The optical assembly of claim 1 , wherein the target is one of a 1D barcode, 2D barcode, QR code, UPC code, or indicia indicative of an object of interest.
21. The optical assembly of claim 1 , wherein the illuminating full field angle can be changed from 16 degrees to 42 degrees.