Light concentrator system

• US 5,604,607 A
• Filed: 10/19/1992
• Issued: 02/18/1997
• Est. Priority Date: 10/19/1992
• Status: Expired due to Term

• Current Assignee: Omnivision Technologies Incorporated (Will Semiconductor Co., Ltd. Shanghai)
• Original Assignee: Eastman Kodak Company
• Inventors: Mirzaoff, Alexander D.
• Primary Examiner(s): Roskoski, Bernard
• Application Number:
  US07/963,292
• Time in Patent Office: 1,583 Days
• Field of Search: 358/484, 250/208.1, 250/227.2, 250/227.11, 355/1
• US Class Current: 358/484
• CPC Class Codes: G02B 19/0023 at least one surface having optical power
• CPC Class Codes: G02B 19/0057 in the form of a laser diode array, e.g. laser diode bar semiconductor laser arrays with beam combining arrangement H01S5/4012
• CPC Class Codes: G02B 19/0085 for use with both a detector and a source , e.g. in a transceiver, G02B19/009, G02B19/0095 take precedence
• CPC Class Codes: G03B 27/16 Illumination arrangements, e.g. positioning of lamps, positioning of reflectors controlling the exposure G03B27/72
• CPC Class Codes: H04N 1/028 for picture information pick-up
• CPC Class Codes: H04N 1/02805 with photodetectors arranged in a two-dimensional array

Abstract

A collector array for imaging comprises of a plurality of small concentrators having a hyperbolic cross section and a circular input and output aperture. Such an array is particularly suitable for use in conjunction with photoelectronic array-type detectors such as CCD'"'"'s and with photographic film.

Claims

1. An image capture system comprising:

a photosensitive medium for capturing an image;

a single path planar array located proximate to said medium for projecting light modulated with image information to the photosensitive medium, said array including a plurality of non-cylindrical concentrator elements formed in said array, said concentrator elements each having an input opening and an output opening and a reflective inner wall between each input opening and output opening which guides and concentrates said light towards and through an output opening towards said photosensitive medium for capturing said image, wherein for each of said elements, said input opening is larger than said output opening.

2. An image capture system according to claim 1 in which said photosensitive medium is film.

3. An image capture system according to claim 1 in which said photosensitive medium is a photoelectronic detector array.

4. An image capture system according to claim 3 in which the size of said output openings, the width of said pixel elements and the distance D between said array of concentrators and said detector array satisfy the relationship ##EQU2## where θ

is the light input angle, c is the output opening radius and 2X is the width of said pixel element.

5. An image capture system according to claim 2 in which said concentrator elements have hyperbolic reflective inner walls and circular input and output openings.

6. An image capture system according to claim 3 in which said concentrator elements have hyperbolic reflective inner walls and circular input and output openings.

7. An image capture system according to claim 3, said image capture system being a camera, said camera further comprising:

means for imaging an object onto said photosensitive medium;

means for controlling an exposure onto said photosensitive medium, and means for storing electrical signals representing said image;

a shutter;

an exposure control and shutter release means;

processing electronics; and

memory means for storing said image.

8. An image capture system according to claim 7, wherein said photosensitive medium is a CCD array having a plurality of pixel elements.

9. An image capture system according to claim 8, said concentrator elements being aligned in close proximity to said detector array, in such a way that the respective centers of said output openings of said concentrator elements correspond substantially to respective centers of said pixel elements.

10. An image capture system according to claim 8 in which the size of said output openings, the width of said pixel elements and the distance D between said array of concentrators and said detector array satisfy the relationship ##EQU3## where θ

is the light input angle, c is the output opening radius and 2X is the width of said pixel element.

11. An image capture system according to claim 9 in which said concentrator elements have hyperbolic reflective inner walls and circular input and output openings.

12. An image capture system according to claim 3, said image capture system being a printing system further comprising:

means for modulating light with an image on a document to be copied; and

means responsive to light imaged on said detector array for forming a hardcopy of said image.

13. An image capture system according to claim 12, wherein said photosensitive medium is a CCD array having a plurality of pixel elements.

14. An image capture system according to claim 13, said concentrator elements being aligned in close proximity to said detector array, in such a way that the respective centers of said output openings of said concentrator elements correspond substantially to respective centers of said pixel elements.

15. An image capture system according to claim 14, in which said concentrator elements have hyperbolic reflective inner walls and circular input and output openings.

16. An image capture system according to claim 2, said image capture system being a contact printer system further comprising:

a light source; and

a film original located so as to modulate light from said light source.

17. An image capture system according to claim 16, whereby the distance between said array of concentrators and said film original is such as to create an image blurring or softening on said copy film.

18. An image capture system comprising a photosensitive medium for capturing an image comprising discrete cells arranged in an array;

and a plurality of concentrator elements for projecting light modulated with image information to said photosensitive medium, said concentrator elements each having an input opening and an output opening and a reflective inner wall between each input and output opening which guides and concentrates said light towards and through an output opening towards said photosensitive medium for capturing said image, wherein in each of said concentrator elements said input opening is larger than said output opening.

19. An image capture system according to claim 18 wherein said concentrator elements correspond one-to-one with said discrete cells arranged in said array.

20. An image capture system according to claim 18, said image capture system being a modified CCD array wherein said concentrator elements are embedded in said discrete cells of said array.

21. An image capture system comprising:

a photosensitive medium for capturing an image;

a single path planar array located proximate to said medium for projecting light modulated with image information to the photosensitive medium, said array including a plurality of non-cylindrical concentrator elements formed in said array, said concentrator elements each having an input opening and an output opening and a reflective inner wall between each input opening and output opening which guides and concentrates said light towards and through an output opening and towards said photosensitive medium for capturing said image, wherein for each of said elements, said input opening is larger than said output opening and where said input opening has a diameter 2a and said output opening has a diameter 2b, where

space="preserve" listing-type="equation">15um<

2a<

50um; and

space="preserve" listing-type="equation">3um<

2b<

15um.

22. An image capture system comprising a photosensitive medium for capturing an image comprising discrete cells arranged in an array;

and a plurality of concentrator elements for projecting light modulated with image information to said photosensitive medium, said concentrator elements each having an input opening and an output opening and a reflective inner wall between each input and output opening which guides and concentrates said light towards and through an output opening towards said photosensitive medium for capturing said image and where said input opening has a diameter 2a and said output opening has a diameter 2b, where

space="preserve" listing-type="equation">15um<

2a<

50um; and

space="preserve" listing-type="equation">3um<

2b<

15um.