Lighting Subsystem for a Machine Vision System

• US 20090073446A1
• Filed: 06/13/2006
• Published: 03/19/2009
• Est. Priority Date: 06/13/2005
• Status: Abandoned Application

• Current Assignee: Coherix Incorporated
• Original Assignee: Coherix Incorporated
• Inventors: Upham, Jon, Davidson, Douglas
• Application Number:
  US11/916,653
• Publication Number:
  US 20090073446A1
• Time in Patent Office: Days
• US Class Current: 356/445
• CPC Class Codes: G01N 21/8806 Specially adapted optical and illumination features
• CPC Class Codes: G01N 21/89 in moving material, e.g. running paper or textiles G01N21/90, G01N21/91, G01N21/94 take precedence
• CPC Class Codes: G01N 21/95684 Patterns showing highly reflecting parts, e.g. metallic elements

Abstract

According to one of the preferred embodiments, the invention includes a machine vision system 110 for inspecting a moving object. The machine vision system 110 includes a camera subsystem 30 to capture the image of a moving object when the object moves into a viewing area, a lighting subsystem 12 to illuminate the moving object, and a controller 14 to control the camera subsystem and the lighting subsystem to effectively freeze and inspect the reflectance of the illumination by the moving object. The lighting subsystem includes light sources 16 arranged around the viewing area.

Claims

1. A machine vision system for inspecting a moving object, comprising:

a camera subsystem adapted to capture the image of a moving object when the object moves into a viewing area;

a primary lighting subsystem adapted to illuminate the moving object, wherein the primary lighting subsystem includes light sources arranged around the viewing area; and

a controller coupled to the camera subsystem and to the primary lighting subsystem and adapted to control the camera subsystem and the lighting subsystem to effectively freeze and inspect the reflectance of the illumination by the moving object.

2. The system of claim 1, wherein the light sources are arranged in a symmetrical pattern around the viewing area.

3. The system of claim 2, wherein the light sources are arranged in a polygonal pattern with at least six sides.

4. The system of claim 3, wherein the controller is further adapted to selectively adjust the intensity of the light sources.

5. The system of claim 4, wherein the primary lighting subsystem includes at least 48 high-intensity LEDs.

6. The system of claim 2, wherein the light sources are grouped in light banks, wherein the light sources of each light bank are arranged in a plane and are aimed toward the viewing area with a substantially similar illumination angle.

7. The system of claim 6, wherein the controller is further adapted to selectively activate one or more of the light banks.

8. The system of claim 7, wherein the controller is further adapted to selectively adjust the intensity of the light banks.

9. The system of claim 8, wherein the primary lighting subsystem includes at least 2 light banks, wherein each light bank includes at least 24 high-intensity LEDs.

10. The system of claim 2, wherein the camera subsystem includes at least three cameras, wherein the first camera is adapted to image the moving object at a first viewing angle, wherein the second camera is adapted to image the moving object at a second viewing angle, and wherein the third camera is adapted to image the moving object at a third viewing angle.

11. The system of claim 10, further comprising a first mirror for the first camera and a second mirror for the second camera.

12. The system of claim 10, further comprising a secondary lighting subsystem adapted to illuminate the moving object, wherein the secondary lighting subsystem includes light sources in a first light group aimed toward the viewing area along the first viewing angle, light sources in a second light group aimed toward the viewing area along the second viewing angle, and light sources in a third light group aimed toward the viewing area along the third viewing angle.

13. The system of claim 12, wherein the controller is further adapted to selectively activate one or more of the primary lighting subsystem and the secondary lighting subsystem.

14. The system of claim 13, wherein the controller is further adapted to selectively adjust the intensity of the light sources of the primary lighting subsystem and the light sources of the secondary lighting subsystem.

15. The system of claim 14, wherein the primary lighting subsystem includes at least 48 high-intensity LEDs, and wherein the secondary lighting subsystem includes at least 8 high-intensity LEDs in each of the light groups.

16. A lighting subsystem for a machine vision system comprising:

a lighting subsystem adapted to illuminate an object, wherein the primary lighting subsystem includes light sources arranged around the viewing area; and

a controller coupled to the camera subsystem and to the primary lighting subsystem and adapted to control the camera subsystem and the lighting subsystem to effectively freeze and inspect the reflectance of the illumination by the moving object.

17. The subsystem of claim 16, wherein the light sources are arranged in a symmetrical pattern around the viewing area.

18. The subsystem of claim 17, wherein the light sources are grouped in light banks, wherein the light sources of each light bank are arranged in a plane and are aimed toward the viewing area with a substantially similar illumination angle.

19. The subsystem of claim 18, wherein the controller is further adapted to selectively activate one or more of the light banks and to selectively adjust the intensity of the light banks.

20. The subsystem of claim 19, wherein the primary lighting subsystem includes at least 2 light banks, wherein each light bank includes at least 24 high-intensity LEDs.