Waveguide array document scanner

• US 5,930,433 A
• Filed: 07/23/1997
• Issued: 07/27/1999
• Est. Priority Date: 07/23/1997
• Status: Expired due to Fees

• Current Assignee: Avago Technologies General IP PTE Limited (Broadcom, Inc.)
• Original Assignee: Hewlett-Packard Company (HP Inc.)
• Inventors: Cutler, Gregory M., Williamson, James B.
• Primary Examiner(s): PALMER, PHAN T H
• Application Number:
  US08/898,935
• Time in Patent Office: 734 Days
• Field of Search: 385/116, 385/115, 385/119, 385/120, 385/121, 356/444, 250/236, 250/227.32, 250/228, 365/234, 369/44.37, 369/44.38, 369/44.39, 369/109, 369/112, 359/217, 359/834
• US Class Current: 385/116
• CPC Class Codes: G02B 6/06 the relative position of the fibres being the same at both ends, e.g. for transporting images
• CPC Class Codes: G02B 6/4249 comprising arrays of active devices and fibres

Abstract

The optical scanner comprises a light source, an image sensor, a planar array of elongate optical waveguides, and input and output coupling optics for communicating light to and from the image transmission optics. The light source is adapted to direct light toward and reflect light from an object to be scanned. The planar array of elongate optical waveguides is formed in a substrate. Each of the waveguides include an input end and an output end and can be tapered along the length of the waveguide. The input optics disposed between the object and the waveguide array can include tubes, single lenses per waveguide, larger lenses per cluster of waveguides, a GRIN lens array or comparable mirror systems for directing light reflected from the object to be scanned to the input ends of the waveguides. The output optics disposed between the waveguide array and the image sensor can include lenses or mirror systems similar to that used for the input coupling optics.

Claims

1. An optical scanner comprising:

a light source for directing light toward an object to be scanned;

a planar array of elongate optical waveguides formed in a substrate, each of said waveguides having an input end and an output end;

input optic means for communicating light reflected from said object to the input end of each of said waveguides;

a photosensitive image sensor; and

output optic means for communicating light transmitted from the output end of each of said waveguides to the image sensor.

2. The optical scanner according to claim 1, wherein said input optic means include an array of lenses, each one of said lenses being associated with an associated one of said waveguides.

3. The optical scanner according to claim 2, wherein said array of lenses is disposed midway between the object to be scanned and the array of waveguides.

4. The optical scanner according to claim 1, wherein each of said waveguides are tapered in width from said input end to said output end.

5. The optical scanner according to claim 4, wherein each of said waveguides are tapered in height from said input end to said output end.

6. The optical scanner according to claim 1, wherein said input optic means include a plurality of lenses, wherein each lens is associated with a waveguide cluster formed of a plurality of waveguides.

7. The optical scanner according to claim 1, further including a optical collector integral with said array of waveguides and disposed in the plane of the waveguide substrate, and an external collector adapted to collect light for the plane perpendicular to the waveguide substrate.

8. The optical scanner according to claim 1, wherein said input optic means include an array of tubes capable of passing an angularly dependent portion of light incident on an input end therethrough to an output end, each of said tubes including a light-transmitting bore therethrough having an output end disposed proximate to, axially aligned with and of substantially the same cross-sectional dimension as an input end of a respective waveguide.

9. The optical scanner according to claim 1, wherein said input optic means include a gradient index lens array.

10. The optical scanner according to claim 1, wherein said array of waveguides is fan-shaped.

11. The optical scanner according to claim 1, wherein said array of waveguides is candelabra-shaped.

12. The optical scanner according to claim 1, wherein said array of waveguides is candlestick-shaped.

13. The optical scanner according to claim 1, further including a second photosensitive image sensor, wherein the light transmitted from the output end of each of said waveguides is communicated to one of either of said photosensitive image sensor or said second photosensitive image sensor.

14. The optical scanner according to claim 1, wherein said photosensitive image sensor comprises a two-dimensional sensor array having a plurality of sensor rows, said array of waveguides having input ends linearly aligned and output ends stacked in registry with said sensor rows.

15. The optical scanner according to claim 1, wherein said output optic means include a gradient index lens array.

16. The optical scanner according to claim 1, wherein said output optic means includes a lens associated with each waveguide for communicating light to three elements of the photosensitive image sensor.

17. The optical scanner according to claim 1, wherein said output optic means includes a trichroic filter adapted to separate light transmitted from the output of each waveguide into a plurality of different frequencies.

18. An optical scanner comprising:

a light source for directing light toward an object to be scanned;

a planar array of elongate optical waveguides formed in a substrate, each of said waveguides having an input end and an output end;

input optic means for communicating light reflected from said object to the input end of each of said waveguides; and

a photosensitive image sensor proximate to the output end of each of said waveguides.

19. The optical scanner according to claim 18, wherein the photosensitive image sensor is comprised of an array of CCD elements, each of said elements corresponding to an individual pixel of an image, wherein each of said CCD elements is proximate an associated waveguide output end.

20. An optical scanner comprising:

a light source for directing light toward an object to be scanned;

a planar array of elongate optical waveguides formed in a substrate, each of said waveguides having an input end, said input end being adapted to receive light reflected from the object to be scanned, and an output end;

a photosensitive image sensor; and

output optic means for communicating light transmitted from the output end of each of said waveguides to the image sensor.