Compact illumination system for image scanner

• US 6,033,086 A
• Filed: 04/30/1998
• Issued: 03/07/2000
• Est. Priority Date: 04/30/1998
• Status: Expired due to Term

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Hewlett-Packard Company (HP Inc.)
• Inventors: Bohn, David D.
• Primary Examiner(s): O'Shea, Sandra
• Assistant Examiner(s): WARD, JOHN A
• Application Number:
  US09/070,142
• Time in Patent Office: 677 Days
• Field of Search: 362/109, 362/249, 362/247, 362/297, 362/235, 362/301, 362/97, 362/98, 362/99, 362/346, 355/67, 382/313, 358/473, 358/475
• US Class Current: 362/235
• 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 1/02865 using an array of light sources or a combination of such arrays, e.g. an LED bar
• CPC Class Codes: H04N 1/107 with manual scanning

Abstract

A compact illumination system for illuminating a scan region on an object may comprise a light source for producing a plurality of light rays. A first reflector is positioned adjacent the light source and is coplanar with a first plane that is located in generally parallel, spaced-apart relation to a scan plane. The first reflector directs toward the scan region some of the light rays produced by the light source. A second reflector is positioned adjacent the light source and is coplanar with a second plane that is not parallel to the scan plane. The second reflector directs toward the scan region some of the light rays produced by the light source.

Claims

1. An illumination system for illuminating a scan region on an object, comprising:

a light source for producing a plurality of light rays;

a first reflector positioned adjacent said light source and coplanar with a first plane, the first plane being located in generally parallel, spaced-apart relation to a scan plane, said first reflector directing some of said light rays toward the scan region; and

a second reflector positioned adjacent said light source and coplanar with a second plane, the second plane being non-parallel with the scan plane, said second reflector directing some of said light rays toward the scan region.

2. The illumination system of claim 1, wherein the plurality of light rays produced by said light source extend along a direction that is generally transverse to a scanning direction.

3. The illumination system of claim 2, wherein said first reflector comprises an elongate reflector that extends along the transverse direction.

4. The illumination system of claim 3, wherein said second reflector comprises an elongate reflector that extends along the transverse direction.

5. The illumination system of claim 4, wherein said light source comprises a generally elongate member that extends along the transverse direction.

6. The illumination system of claim 5, wherein said first reflector is substantially coextensive with the elongate member comprising said light source.

7. The illumination system of claim 6, wherein said second reflector is substantially coextensive with the elongate member comprising said light source.

8. The illumination system of claim 1, wherein said first reflector comprises a planar reflector.

9. The illumination system of claim 1, wherein said second reflector comprises a planar reflector.

10. The illumination system of claim 1, wherein said light source comprises a plurality of light emitting diodes positioned in spaced-apart relation so that said plurality of light emitting diodes extend along a direction that is substantially transverse to a scanning direction.

11. The illumination system of claim 10, wherein said first reflector comprises a generally elongate member having a generally planar reflecting surface.

12. The illumination system of claim 11, wherein said second reflector comprises a generally elongate member having a generally planar reflecting surface.

13. The illumination system of claim 12, wherein the second plane intersects the scan plane at an oblique angle.

14. The illumination system of claim 13, wherein the oblique angle comprises an angle in the range of about 30 degrees to about 60 degrees.

15. The illumination system of claim 14, wherein the generally planar reflecting surface of said first reflector comprises aluminum.

16. The illumination system of claim 14, wherein the generally planar reflecting surface of said second reflector comprises aluminum.

17. An illumination system for illuminating a scan region on an object, comprising:

a plurality of light emitting diodes for producing a plurality of light rays, said plurality of light emitting diodes being positioned in spaced-apart relation along a direction that is substantially transverse to a scanning direction;

a first reflector positioned adjacent said light source and coplanar with a first plane, the first plane being located in generally parallel, spaced-apart relation to a scan plane, said first reflector directing some of said light rays toward the scan region; and

a second reflector positioned adjacent said light source and coplanar with a second plane, the second plane being non-parallel with the scan plane, said second reflector directing some of said light rays toward the scan region.

18. The illumination system of claim 17, wherein said first reflector comprises a generally elongate member having a reflective surface that is coextensive with said plurality of light emitting diodes.

19. The illumination system of claim 18, wherein said second reflector comprises a generally elongate member having a reflective surface that is coextensive with said plurality of light emitting diodes.

20. The illumination system of claim 19, wherein the reflective surfaces of said first and second reflectors comprise planar reflective surfaces.

21. The illumination system of claim 20, wherein the reflective surfaces of said first and second reflectors comprise curved reflective surfaces.

22. A method for illuminating a scan region on an object, comprising the steps of:

generating a plurality of light rays from a light source;

reflecting some of the plurality of light rays from the light source off a first reflector positioned adjacent the light source and coplanar with a first plane, the first plane being located in generally parallel, spaced-apart relation to a scan plane, the first reflector directing some of the light rays toward the scan region; and

reflecting some of the plurality of light rays from the light source off a second reflector positioned adjacent the light source and coplanar with a second plane, the second plane being non-parallel with the scan plane, the second reflector directing some of the light rays toward the scan region.

23. A method for illuminating a scan region on an object, comprising the steps of:

providing a light source for producing a plurality of light rays;

positioning a first reflector adjacent the light source so that the first reflector is coplanar with a first plane that is generally parallel to a scan plane and so that the first reflector directs some of the light rays toward the scan region; and

positioning a second reflector adjacent the light source so that the second reflector is coplanar with a second plane that is non-parallel with the scan plane and so that the second reflector directs some of the light rays toward the scan region.

24. An illumination system for illuminating a scan region on an object, comprising:

a light emitting diode having a light emitting side and a mounting side mounted so that the light emitting side of said light emitting diode is generally perpendicular to a scan plane, the light emitting side of said light emitting diode producing a plurality of light rays;

a first reflector positioned adjacent said light emitting diode and coplanar with a first plane, the first plane being located in generally parallel, spaced-apart relation to the scan plane, said first reflector directing toward the scan region some of the light rays produced by said light emitting diode; and

a second reflector positioned adjacent said light emitting diode and coplanar with a second plane, the second plane being non-parallel with the scan plane, said second reflector directing some of said light rays toward the scan region.