Low cost color-programmable focusing ring light

• US 6,273,338 B1
• Filed: 09/22/1998
• Issued: 08/14/2001
• Est. Priority Date: 09/22/1998
• Status: Expired due to Fees

• Current Assignee: White, Timothy
• Original Assignee: White, Timothy
• Inventors: White, Timothy
• Primary Examiner(s): LE, THIEN MINH
• Application Number:
  US09/158,735
• Time in Patent Office: 1,057 Days
• Field of Search: 235/455, 235/462.01, 235/462.1, 235/462.06, 235/462.11, 235/462.24, 235/462.36, 235/462.29, 235/472.01, 235/462.41, 235/462.42
• US Class Current: 235/462.42
• CPC Class Codes: G01N 21/8806 Specially adapted optical and illumination features
• CPC Class Codes: H04N 1/02815 Means for illuminating the original, not specific to a particular type of pick-up head
• CPC Class Codes: H04N 1/0285 in combination with at least one reflector which is in fixed relation to the light source
• CPC Class Codes: H04N 1/0286 in combination with a light integrating, concentrating or defusing cavity
• CPC Class Codes: H04N 1/02865 using an array of light sources or a combination of such arrays, e.g. an LED bar
• CPC Class Codes: H04N 1/02895 Additional elements in the illumination means or cooperating with the illumination means, e.g. filters H04N1/02885 takes precedence; optical elements other than lenses per se G02B5/00

Abstract

Provided herein are devices and methods of illuminating an object. The devices may include a housing having an inner reflective surface, an illumination source, disposed in a ring on the inner reflective surface of the housing, a fresnel lens disposed on the housing opposite the inner reflective surface, for focusing illumination to the object, and a partially reflective reflector, disposed on the fresnel lens, for transmitting illumination to the object and for reflecting illumination to the inner reflective surface. The illumination source may be a plurality of plurality of light emitting diodes disposed in a ring about the inner reflective surface, a ring light, or other illumination source. The partially reflective reflector may be a half-silvered mirror. The devices may further include a camera for viewing the object, an image processor, for processing an image from the camera, and a processor, for storing, manipulating and retrieving data corresponding to the image. The processor may be part of a system for inventory, materials handling, process control, or the like, or may be part of a machine vision device, such as a matrix code reader or a hand held scanner. The fresnel lens may be made interchangeable, so that lenses of different focal lengths may be used for viewing objects at different distances from the device. The device may include a circuit for controlling at least one of the color and the intensity of the illumination source.

Claims

1. A device for illuminating an object, comprising:

a housing having an inner reflective surface;

an illumination source, disposed in a ring on the inner reflective surface;

a fresnel lens disposed on the housing opposite the inner reflective surface, for focusing illumination to the object; and

a partially reflective reflector, disposed on the fresnel lens, for transmitting illumination to the object and for reflecting illumination to the inner reflective surface.

2. The device of claim 1, wherein the illumination source is a plurality of light emitting diodes.

3. The device of claim 1, wherein the illumination source is a ring light.

4. The device of claim 1, wherein the partially reflective reflector is a half-silvered mirror.

5. The device of claim 1, wherein the housing includes an aperture, further comprising:

a camera for viewing the object.

6. The device of claim 5, wherein the camera is a machine vision camera for producing an image corresponding to the object.

7. The device of claim 6, further comprising:

a processor, for processing the image to generate data.

8. The device of claim 7, further comprising:

an inventory management system for processing the data.

9. The device of claim 7, further comprising:

a materials handling system for processing the data.

10. The device of claim 7, further comprising:

a matrix code reader for processing the data.

11. The device of claim 7, further comprising:

a process control system for processing the data.

12. The device of claim 7, further comprising:

a hand held scanner for processing the data.

13. The device of claim 1, wherein the fresnel lens is removable, so that the fresnel lens is interchangeable with another lens.

14. The device of claim 1, further comprising:

a circuit for controlling at least one of the color and the intensity of the illumination source.

15. The device of claim 14, wherein the illumination source is a ring of light emitting diodes of a plurality of different colors.

16. The device of claim 1, further comprising:

a fan for cooling the device.

18. The method of claim 16, wherein the computer controls a process based on the data.

17. A method of image processing an image from an illuminated object, comprising:

providing a ring of light emitting diodes;

providing a partially reflective reflector;

providing a fresnel lens for focusing illumination on the object;

providing a camera for viewing the object;

providing a vision processor for processing data from the camera; and

providing a computer for storing manipulating and retrieving data from the vision processor.

19. The method of claim 17, wherein the process is a manufacturing process.

20. The method of claim 17, wherein the process is an inventory control process.

21. The method of claim 17, wherein the process is a materials handling process.

22. A method of illuminating an object, comprising:

providing an illumination source;

providing a fresnel lens for focusing illumination on the object;

providing a partially reflective reflector, disposed on the fresnel lens, for transmitting illumination to the object and for reflecting illumination to the inner reflective surface; and

providing a reflective surface, for reflecting illumination from the partially reflective reflector to the fresnel lens.

23. The method of claim 22, wherein the illumination source is a plurality of light emitting diodes.

24. The method of claim 22, wherein the illumination source is a ring light.

25. The method of claim 22, wherein the partially reflective reflector is a half-silvered mirror.

26. The method of claim 22, further comprising:

providing a camera for viewing the object.

27. The method of claim 26, wherein the camera is a machine vision camera for producing an image corresponding to the object.

28. The method of claim 27, further comprising:

processing the image to generate data.

29. The method of claim 28, further comprising:

providing an inventory management system for processing the data.

30. The method of claim 28, further comprising:

providing a materials handling system for processing the data.

31. The method of claim 28, further comprising:

providing a matrix code reader for processing the data.

32. The method of claim 28, further comprising:

providing a process control system for processing the data.

33. The method of claim 22, wherein the fresnel lens is removable, so that the fresnel lens is interchangeable with another lens.

34. The method of claim 22, further comprising:

controlling at least one of the color and the intensity of the illumination source.