Machine Vision Inspection System and Light Source Module thereof

• US 20100103661A1
• Filed: 01/13/2009
• Published: 04/29/2010
• Est. Priority Date: 10/27/2008
• Status: Abandoned Application

• Current Assignee: Chung Hua University
• Original Assignee: Chung Hua University
• Inventors: Liu, Jian-Zong, Chiou, Yih-Chih
• Application Number:
  US12/352,868
• Publication Number:
  US 20100103661A1
• Time in Patent Office: Days
• US Class Current: 362/231
• CPC Class Codes: G01N 21/8806 Specially adapted optical and illumination features
• CPC Class Codes: G01N 2201/06153 the sources being LED's
• CPC Class Codes: G01N 2201/0636 Reflectors

Abstract

In a machine vision inspection system and a light source module, the light source module includes a semi-cylindrical lampshade and linear LED light sources for provide light beams. The luminance is determined by a number of rows of the linear LED light sources, a length of each linear LED light source and cooperation of colors, wavelengths or sizes of the LEDs. The linear LED light sources are located or assembled to an interior of a curved surface of the semi-cylindrical lampshade, and arranged from a first curved-surface edge to a second curved-surface edge of the curved interior by a preset interval and a relative included angle. An arranging direction of the linear LED light sources is same to an extending direction of the interior of the curved interior. The shadow caused by illuminating from one single side may be eliminated. The present invention possesses the advantage of low cost.

Claims

1. A machine vision inspection system, comprising:

an inspection stage configured for moving an object under test;

a linear image capture module configured for grabbing an image of the object under test; and

a light source module configured for providing light beams to the linear image capture module, and the light source module comprising;

a plurality of linear light emitting diode (LED) light sources configured for providing the light beams, each of the linear LED light sources comprising a plurality of LEDs, luminance of the linear LED light sources being determined by the number of rows of the linear LED light sources, the length of each of the linear LED light sources and the cooperation of the LEDs with the same or different colors, wavelengths or sizes; and

a lampshade having a semi-cylindrical inner space, the interior of the lampshade being a semi-circular curved surface with an upward opening or a downward opening, a first disposing area and a second disposing area in the interior of the lampshade being located at both sides of the longitudinal axis of the semi-cylindrical lampshade, the linear LED light sources being disposed symmetrically in the first disposing area and the second disposing area, intervals between each two adjacent linear LED light sources in the first disposing area and the second disposing area being the same, a linear field of view of the linear image capture module being served as a reference axis, each of the linear LED light sources being disposed at a relative included angle relative to the reference axis, and an arranging direction of each of the linear LED light sources being the same with an extending direction of the semi-circular curved surface.

2. The machine vision inspection system as claimed in claim 1, wherein the exterior of the lampshade is semi-cylindrical, material of the lampshade comprises plastic or metal, and material of the interior of the lampshade or a coating on the interior of lampshade is capable of reflecting light, absorbing light or dissipating heat, and a size or a length of the lampshade is expandable and contractible.

3. The machine vision inspection system as claimed in claim 1, wherein the lampshade has a plurality of combining grooves disposed at the first disposing area and a second disposing area for attaching the linear LED light sources to the lampshade from the exterior of the lampshade.

4. The machine vision inspection system as claimed in claim 1, wherein the linear LED light sources are joined to the lampshade by a combining means.

5. The machine vision inspection system as claimed in claim 4, wherein the combining means is selected from a group consisting of locking, wedging, clasping, embedding, welding, adhering and magnetism-combining.

6. The machine vision inspection system as claimed in claim 1, wherein the lampshade has a removable portion located at a contact location between the lampshade and the object under test for avoiding the lampshade contacting the object under test.

7. The machine vision inspection system as claimed in claim 1, wherein the lampshade further comprises:

a plurality of angle-adjusting elements configured for adjusting arranging angles of the linear LED light sources to adjust illuminating angles and illuminating locations of the light beams illuminating the linear field of view.

8. A light source module for providing light beams to a linear image capture module, comprising:

a plurality of linear LED light sources configured for providing the light beams according to a preset illuminating-direction, each of the linear LED light sources comprising a plurality of LEDs, luminance of the linear LED light sources being determined by the number of rows of the linear LED light sources, the length of each of the linear LED light sources and the cooperation of the LEDs with the same or different colors, wavelengths or sizes; and

a lampshade, the interior shape of the lampshade being a semi-circular curved surface with an upward opening or a downward opening and having a first disposing area and a second disposing area, the linear LED light sources being disposed in the first disposing area and the second disposing area, intervals between each two adjacent linear LED light sources in the first disposing area and the second disposing area being the same, each of the linear LED light sources being disposed at a relative included angle, and an arranging direction of each of the linear LED light sources being the same with an extending direction of the semi-circular curved surface.

9. The light source module as claimed in claim 8, wherein the exterior shape of the lampshade is semi-cylindrical.

10. The light source module as claimed in claim 8, wherein the lampshade has a plurality of combining grooves disposed at the first disposing area and the second disposing area for combining the linear LED light sources with the lampshade from an exterior of the lampshade.

11. The light source module as claimed in claim 8, wherein the linear LED light sources are attached to the lampshade by a combining means.

12. The light source module as claimed in claim 11, wherein the combining means is selected from a group consisting of locking, wedging, clasping, embedding, welding, adhering and magnetism-combining.

13. The light source module as claimed in claim 11, wherein the combining means employs assembling lock portions arranged at the lampshade.

14. The light source module as claimed in claim 8, wherein the lampshade further comprises a removable portion configured for preventing the lampshade from touching the object under test.

15. The light source module as claimed in claim 8, wherein the lampshade further comprises:

a plurality of angle-adjusting elements configured for adjusting the linear LED light sources to determine the preset illuminating-direction.

16. The light source module as claimed in claim 8, wherein the preset illuminating-direction is selected from a group consisting of projecting and focusing the light beams provided by the linear LED light sources to a linear field of view of the linear image capture module, projecting the light beams provided by all of the linear LED light sources or a part of the linear LED light sources at one or more specific angles and projecting the light beams provided by the linear LED light sources to the interior of the lampshade for being reflected by the interior of the lampshade to at least one specific focus or being absorbed.

17. The light source module as claimed in claim 8, wherein a carrier of each of the linear LED light sources is a rigid or flexible circuit board.

18. The light source module as claimed in claim 8, wherein material of the lampshade comprises plastic or metal, and the interior of the lampshade is coated with a coating capable of reflecting light, absorbing light or dissipating heat.

19. A light source module for a linear image capture system, comprising:

a plurality of linear LED light sources configured for providing light beams, each of the linear LED light sources comprising a plurality of LEDs, luminance of the linear LED light sources being determined by the number of rows of the linear LED light sources, the length of each of the linear LED light sources and the cooperation of the LEDs with the same or different colors, wavelengths or sizes; and

a semi-cylindrical lampshade, the linear LED light sources being located at or assembled to the curved interior of the semi-cylindrical lampshade and being symmetric to the longitudinal axis of the semi-cylindrical lampshade, the linear LED light sources being arranged from the edge of the first curved-surface of the curved interior to the edge of the second curved-surface of the curved interior by a preset interval and a preset relative included angle, and an arranging direction of each of the linear LED light sources being the same with an extending direction of the curved interior.

20. The light source module as claimed in claim 19, wherein the semi-cylindrical lampshade further comprises:

a plurality of combining grooves configured for attaching the linear LED light sources to the semi-cylindrical lampshade from an exterior of the lampshade.

21. The light source module as claimed in claim 19, wherein the linear LED light sources are joined to the semi-cylindrical lampshade by a combining means, and the combining means is selected from a group consisting of locking, wedging, clasping, embedding, welding, adhering and magnetism-combining.

22. The light source module as claimed in claim 19, wherein the semi-cylindrical lampshade has a first removable portion located at the edge of the first curved-surface and a second removable portion located at the edge of the second curved-surface for preventing the semi-cylindrical lampshade from touching the object under test.

23. The light source module as claimed in claim 19, wherein the semi-cylindrical lampshade further comprises:

a plurality of angle-adjusting elements for adjusting illuminating-angles of the linear LED light sources.

24. The light source module as claimed in claim 19, wherein material of the semi-cylindrical lampshade comprises plastic or metal, and the curved interior of the semi-cylindrical lampshade is coated with a coating capable of reflecting light, absorbing light or dissipating heat.

25. The light source module as claimed in claim 19, wherein intervals between each two adjacent linear LED light sources and the preset relative included angles of the linear LED light sources are the same or different according to a preset illuminating-direction.