DMD scanner

• US 5,457,566 A
• Filed: 12/30/1992
• Issued: 10/10/1995
• Est. Priority Date: 11/22/1991
• Status: Expired due to Term

• Current Assignee: Texas Instruments, Inc.
• Original Assignee: Texas Instruments, Inc.
• Inventors: Sartain, Daryl G., Sampsell, Jeffrey B.
• Primary Examiner(s): Sugarman, Scott J.
• Assistant Examiner(s): Robbins, Thomas
• Application Number:
  US07/999,585
• Time in Patent Office: 1,014 Days
• Field of Search: 359/291, 359/292, 359/295, 359/297, 359/298, 359/212, 257/431, 257/435, 257/459, 358/233, 358/62, 358/474, 358/494, 340/764, 355/233, 355/217, 348/755, 348/770, 348/771
• US Class Current: 359/292
• CPC Class Codes: G02B 26/0841 the reflecting element being moved or deformed by electrostatic means
• CPC Class Codes: G02B 26/10 Scanning systems
• CPC Class Codes: H04N 1/028 for picture information pick-up
• CPC Class Codes: H04N 1/12 using the sheet-feed movement or the medium-advance or the drum-rotation movement as the slow scanning component, e.g. arrangements for the main-scanningsheet-feed movement by translatory movement of a flat picture-bearing surface H04N1/1008; main-scanning using oscillating or rotating mirrors H04N1/113; using multi-element arrays H04N1/19
• CPC Class Codes: H04N 1/1275 using a solid-state deflector, e.g. an acousto-optic deflector or a semiconductor waveguide device
• CPC Class Codes: H04N 3/09 for electromagnetic radiation in the invisible region, e.g. infrared
• CPC Class Codes: H04N 3/12 by switched stationary formation of lamps, photocells or light relays
• CPC Class Codes: H04N 5/7458 the modulator being an array of deformable mirrors, e.g. digital micromirror device [DMD]

Abstract

A scanning optical system is disclosed. The system consists of a spatial light modulator with minimum diffraction effects that can be scanned line by line, a detector appropriate to the application and appropriate optics. One application of such a system is in the infrared realm. The disclosure eliminates the need for a spinning mirror that is standard is infrared scanning systems. Another application is in photocopying. Using a line scanning device, such as a membrane deformable mirror device, eliminates the need for a moving light bar.

Claims

1. An optical system for scanning an image comprising:

a. a spatial light modulator for receiving said image and for selectively reflecting portions of said image;

b. a detector for detecting said portions; and

c. optics for directing said image onto said spatial light modulator and said portions of said image from said spatial light modulator onto said detector.

2. The system in claim 1 wherein said detector is an infrared detector.

3. The system in claim 1 further comprising a print engine of a copier wherein said detector is an input to said print engine.

4. An optical system for scanning an image comprising:

a detector for detecting light;

at least one lens for focusing light from an image source;

a spatial light modulator array receiving said focused light, said spatial light modulator array comprised of an array of spatial light modulator cells, each of said cells selectively addressable for deflecting incident light toward said detector, wherein said cells are serially addressed thereby serially deflecting portions of said focused light onto said detector.

5. The system of claim 4 wherein said spatial light modulator array is comprised of at least two rows of spatial light modulator cells, each said rows comprised of at least two spatial light modulator cells.

6. The system of claim 4 wherein said spatial light modulator array is comprised of at least two rows of spatial light modulator cells, each said row comprised of at least one spatial light modulator cell, wherein all said cells on a row are addressed simultaneously.

7. The system of claim 4 wherein said spatial light modulator array is comprised of at least two rows of spatial light modulator cells, each said row comprised of at least one spatial light modulator cell, wherein all said cells on a row are addressed simultaneously and each row is addressed sequentially.

8. The system of claim 4 wherein said image source is self-radiating.

9. The system of claim 4 wherein said image source is illuminated by a light source.

10. The system of claim 4 wherein said detector is an infrared detector.

11. The system of claim 4 further comprising a print engine connected to said detector for reproducing said image.

12. The system of claim 4 further comprising an optical stop wherein light reflecting off an undetected cell of said spatial light modulator array is prevented from passing to said detector by said optical stop.

13. The system of claim 12 wherein said optical stop is a mirror.

14. A method of scanning an image comprising:

providing light from an image source;

focusing said light from an image source onto a spatial light modulator wherein said spatial light modulator comprises an array of spatial light modulator cells;

deflecting a portion of said spatial light modulator cells to deflect a portion of said focused light;

detecting said deflected portion of said focused light; and

repeating said deflecting and detecting steps until the image has been detected.

15. The method of claim 14 wherein said deflecting step comprises deflecting one row of said spatial light modulator.

16. The method of claim 14 wherein said light from an image source is infrared.

17. An optical system for scanning an input image comprising:

a. a lens for focusing light from an image source along a first light path;

b. a spatial light modulator on said first light path for receiving said focused light and selectively reflecting portions of said focused light, wherein said selectively reflected portions of said focused light are transmitted along a second light path; and

c. a detector on said second light path for receiving said selectively reflected portions of said focused light.

18. The optical system of claim 17 further comprising a stop minor on said first light path for reflecting said light from said image source toward said spatial light modulator.

19. The optical system of claim 18 wherein said spatial light modulator selectively reflects portions of said focused light around said stop mirror.

20. The optical system of claim 17 wherein said spatial light modulator is a membrane deformable mirror device.