SURFACE SCANNING DEVICE

• US 20110181873A1
• Filed: 09/10/2009
• Published: 07/28/2011
• Est. Priority Date: 09/12/2008
• Status: Active Grant

• Current Assignee: Ceramicam, Ltd.
• Original Assignee: Ceramicam, Ltd.
• Inventors: Tzidon, Dekel, Yavets-Chen, Yehuda
• Granted Patent: US 8,502,968 B2
• Time in Patent Office: Days
• US Class Current: 356/237.2
• CPC Class Codes: G01N 2021/8845 Multiple wavelengths of illumination or detection
• CPC Class Codes: G01N 21/55 Specular reflectivity
• CPC Class Codes: G01N 21/8901 Optical details; Scanning details per se G02B

Abstract

A surface scanning device for inspecting a product surface includes an illumination module and an image acquisition device. The illumination module is designed to illuminate the product surface with illumination of substantially uniform illuminance. The illumination module is also designed to configure a configurable range of angles of incidence of the illumination on the product surface. The image acquisition device images the illuminated area.

Claims

1. A surface scanning device for inspecting a product surface comprising:

an illumination module for illuminating the product surface with illumination of substantially uniform illuminance, and for configuring a configurable range of angles of incidence of the illumination on the product surface; and

an image acquisition device for imaging the illuminated area.

2. A device as claimed in claim 1, wherein the illumination module includes an illumination source.

3. A device as claimed in claim 1, wherein the configurable range of angles of incidence is selectable from two or more ranges of angles of incidence

4. A device as claimed in claim 1, wherein the configurable range of angles of incidence is adjustable.

5. A device as claimed in claim 1, wherein the illumination module includes a diffuser.

6. A device as claimed in claim 5, wherein the diffusing power of the diffuser is adjustable.

7. A device as claimed in claim 1, wherein the illumination module includes an aperture.

8. A device as claimed in claim 7, wherein the aperture is adjustable.

9. A device as claimed in claim 1, wherein the illumination module includes a converging lens.

10. A device as claimed in claim 9, wherein the lens comprises one or more Fresnel lenses.

11. A device as claimed in claim 10, wherein at least one of said one or more Fresnel lenses is curved.

12. A device as claimed in claim 10, wherein said one or more Fresnel lenses comprises two adjacent Fresnel lenses, and wherein flat surfaces of the two Fresnel lenses face each other.

13. A device as claimed in claim 1, wherein the image acquisition device comprises a line camera.

14. A device as claimed in claim 1, wherein the illumination module and the image acquisition device are arranged at such that an axis of a beam of illumination produced by the illumination module and a line of sight of the image acquisition device form substantially equal and opposite angles with a normal to the product surface.

15. A device as claimed in claim 1 wherein a location and orientation of the illumination module, the image acquisition device, or both is adjustable.

16. A device as claimed in claim 1, wherein the illumination module produces illumination in at least two different spectral ranges, each spectral range having separately configurable range of angles of incidence, and the image acquisition device includes sensors each responsive to one of the different spectral ranges.

17. A device as claimed in claim 15, wherein the illumination module comprises a stack of spectral filters, each spectral filter of the stack configured to block transmission of at least one of the different spectral ranges while transmitting at least one of the different spectral ranges, each spectral filter including an aperture for transmitting all of the different spectral ranges.

18. A device as claimed in claim 17, wherein the aperture of a spectral filter of the stack of spectral filters is adjustable.

19. A device as claimed in claim 16, wherein the illumination module comprises an array of sources of illumination, each source of illumination configured to produce illumination in one of the different spectral ranges, the sources being controllable such the sources in a region of the array producing illumination in one of the different spectral ranges may be turned on independent of sources in other regions of the array, and independent of sources producing illumination in a different spectral range.