Optical imaging device

• US 20050206772A1
• Filed: 03/14/2005
• Published: 09/22/2005
• Est. Priority Date: 10/10/2003
• Status: Active Grant

• Current Assignee: Ruling Optics LLC
• Original Assignee: Ruling Optics LLC
• Inventors: Yang, Yuping
• Granted Patent: US 7,633,655 B2
• Time in Patent Office: Days
• US Class Current: 348/335
• CPC Class Codes: G02B 2006/0098 for scanning
• CPC Class Codes: G02B 6/0016 Grooves, prisms, gratings, scattering particles or rough surfaces
• CPC Class Codes: G02B 6/005 provided by one optical element, or plurality thereof, placed on the light output side of the light guide
• CPC Class Codes: G02B 6/0051 Diffusing sheet or layer
• CPC Class Codes: G02B 6/4298 coupling with non-coherent light sources and/or radiation detectors, e.g. lamps, incandescent bulbs, scintillation chambers
• CPC Class Codes: H04N 1/10 using flat picture-bearing surfaces H04N1/113, H04N1/195 take precedence
• CPC Class Codes: H04N 1/195 the array comprising a two-dimensional array or a combination of two-dimensional arrays
• CPC Class Codes: H04N 1/19584 Combination of arrays
• CPC Class Codes: H04N 1/19589 Optical means, e.g. an optical fibre bundle, for mapping the whole or a part of a scanned image onto the array
• CPC Class Codes: H04N 2201/0081 Image reader H04N2201/0091 - H04N2201/0094 take precedence

Abstract

An optical imaging device for obtaining an image of a stationary image placed on an at least partially transparent platform. In one embodiment, the optical imaging device includes at least one illuminating plate having at least one open cell, at least one imaging head received in the at least one open cell of the at least one illuminating plate, and a light source adapted for emitting a light, where the at least partially transparent platform, the at least one illuminating plate, and the light source are arranged such that when in operation, a light emitted from the light source is directed into the at least one illuminating plate so that the light is evenly spread toward the at least partially transparent platform, reflected off the stationary image placed on the at least partially transparent platform and received by the at least one image head to obtain the image of the stationary image placed on the at least partially transparent platform.

Claims

1. An optical imaging device having a housing, wherein the housing has a bottom portion, and an opposite, top portion, comprising:

a. an at least partially transparent platform having a first surface, an opposite, second surface, and a thickness, h, defined therebetween by the first surface and the second surface, and positioned over the top portion of the housing for supporting a stationary image placed on the first surface;

b. a reference pattern formed at a plane substantially parallel to and at a distance, d, from the first surface of the at least partially transparent platform, wherein d is greater than zero but not greater than the thickness h of the at least partially transparent platform;

c. a plate placed inside the housing, wherein the plate has a first surface that is substantially reflective and an opposite, second surface, and the plate is positioned above the bottom portion such that the first surface is facing the second surface of the at least partially transparent platform;

d. a number, N, of image heads, each image head having a head portion with a dimension and positioned on the plate in relation to its neighboring image heads to satisfy the relation of;

l<

L,

with l being a characteristic dimension of the number N of image heads, and L being a characteristic distance between two neighboring image heads; and

e. a light source positioned inside the housing and adapted to direct a light beam at the first surface of the plate so that the light beam is reflected to the at least partially transparent platform, reflected off the stationary image placed on the first surface of the at least partially transparent platform and received by the number N of image heads to obtain an image of the stationary image placed on the first surface of the at least partially transparent platform.

2. The optical imaging device of claim 1, wherein the reference pattern has at least two colors which are substantially distinguishable from each other.

3. The optical imaging device of claim 2, wherein the reference pattern is formed on the second surface of the at least partially transparent platform at a predetermined position, and the distance d substantially equals to the thickness h of the at least partially transparent platform.

4. The optical imaging device of claim 2, wherein the reference pattern comprises a white area with a plurality of markers, each marker placed at a predetermined position in the white area, and being identifiable from the white area.

5. The optical imaging device of claim 2, wherein the reference pattern comprises a grid.

6. The optical imaging device of claim 1, wherein each of the number N of image heads obtains at least a partial image of the stationary image placed on the first surface of the at least partially transparent platform.

7. The optical imaging device of claim 6, further comprising an image processing system coupled with the number N of image heads for combining the partial images of the stationary image to form a substantially complete image of the stationary image.

8. The optical imaging device of claim 1, wherein the number N of image heads are substantially identical such that l=l₁=l₂= . . . =l_N, l_i being the dimension of the ith image head, i=1, 2, . . . , N, and N being the total number of the image heads.

9. The optical imaging device of claim 1, wherein the number N of image heads are different such that at least two of image heads may have different characteristic dimensions, and l=Max{l_i, i=1, . . . , N}, l_i being the dimension of the ith image head, i=1, 2, . . . , N, and N being the total number of the image heads.

10. The optical imaging device of claim 1, wherein the number N of image heads are positioned in an array such that any two neighboring heads have a substantially identical minimum distance, and L=L₁=L₂= . . . =L_M, L_j being a characteristic distance between the jth pair of neighboring image heads, j=1, 2, . . . , M, and M being the total number of pairs of the neighboring image heads.

11. The optical imaging device of claim 1, wherein the number N of image heads are positioned in an array such that different pairs of neighboring heads may have different minimum distances, and L=Min{L_j, j=1, . . . , M}, L_j being a characteristic distance between the jth pair of neighboring image heads, j=1, 2, . . . , M, and M being the total number of pairs of the neighboring image heads.

12. The optical imaging device of claim 1, wherein each of the number N of image heads comprises a lens structure having an optical axis and an imaging sensor placed on the optical axis of the lens structure such that a light received by the lens structure is focused on the imaging sensor.

13. The optical imaging device of claim 1, wherein each of the number N of image heads comprises a lens structure and a waveguide member having an input end and an output end, wherein the lens structure and the waveguide member are arranged such that in operation, a light received by the lens structure is directed into the input end of the waveguide member and transmitted out from the output end of the waveguide member.

14. The optical imaging device of claim 13, wherein the output ends of the waveguide members of the number N of image heads are coupled with one or more image sensors.

15. The optical imaging device of claim 13, wherein the waveguide member comprises a bundle of optical fibers, which are dimensionally associated with one another.

16. The optical imaging device of claim 1, wherein the first surface of the plate is adapted for substantially evenly spreading the emitted light toward the stationary image through the at least partially transparent platform.

17. The optical imaging device of claim 16, wherein the first surface of the plate is rugged.

18. The optical imaging device of claim 1, wherein the light source comprises at least one of a fluorescent light tube, a light emitting diode assembly, a tungsten lamp, a tungsten halogen lamp, a halogen lamp, an Xenon lamp, and any combination thereof.

19. The optical imaging device of claim 1, wherein the at least partially transparent platform comprises a plate made of an at least partially transparent material.

20. The optical imaging device of claim 19, wherein the at least partially transparent platform comprises a glass plate or a transparent plastic plate.

21. An optical imaging device for obtaining an image of a stationary image placed on an at least partially transparent platform, comprising:

a. at least one illuminating plate having at least one open cell;

b. at least one imaging head received in the at least one open cell of the at least one illuminating plate; and

c. a light source adapted for emitting a light,

wherein the at least partially transparent platform, the at least one illuminating plate, and the light source are arranged such that when in operation, a light emitted from the light source is directed into the at least one illuminating plate so that the light is evenly spread toward the at least partially transparent platform, reflected off the stationary image placed on the at least partially transparent platform and received by the at least one image head to obtain the image of the stationary image placed on the at least partially transparent platform.

22. The optical imaging device of claim 21, wherein the at least one image head comprises a lens structure having an optical axis and an imaging sensor placed on the optical axis of the lens structure such that a light received by the lens structure is focused on the imaging sensor.

23. The optical imaging device of claim 21, wherein the at least one image head comprises a lens structure and a waveguide member having an input end and an output end, wherein the lens structure and the waveguide member are arranged such that when in operation, a light received by the lens structure is directed into the input end of the waveguide member and transmitted out from the output end of the waveguide member.

24. The optical imaging device of claim 23, wherein the at least one image head further comprises an imaging sensor coupled with the output end of the waveguide member.

25. The optical imaging device of claim 23, wherein the waveguide member comprises a bundle of optical fibers that are dimensionally associated with one another.

26. The optical imaging device of claim 21, wherein the light source comprises at least one of a fluorescent light tube, a light emitting diode assembly, a tungsten lamp, a tungsten halogen lamp, a halogen lamp, an Xenon lamp, a flat-panel light source and any combination thereof.

27. The optical imaging device of claim 21, wherein the at least one illuminating plate comprises a light guiding layer having a first surface and an opposite, second surface, and a diffuser layer positioned on the first surface of the light guiding layer.

28. The optical imaging device of claim 27, wherein the second surface of the light guiding layer is reflective to a light received by the surface.

29. The optical imaging device of claim 27, wherein the second surface of the light guiding layer is rugged.

30. The optical imaging device of claim 27, wherein the light guiding layer is made of a transparent material.

31. The optical imaging device of claim 30, wherein the transparent material comprises a glass or a transparent plastic material.

32. The optical imaging device of claim 27, wherein the at least one illuminating plate further has a support layer formed on the second surface of the light guiding layer so that an interface is formed therebewteen the support layer and the light guiding layer.

33. The optical imaging device of claim 32, wherein the interface is substantially reflective to a light received by the interface.

34. The optical imaging device of claim 32, wherein the interface is rugged.

35. The optical imaging device of claim 27, wherein the diffuser layer is made of mat glass or semi-transparent plastic.

36. The optical imaging device of claim 27, wherein the at least one illuminating plate comprises further comprises a light aligning layer positioned on the diffuser layer.

37. The optical imaging device of claim 36, wherein the light aligning layer comprises a structural pattern adapted for aligning a light transmitted from the diffuser layer to a predetermined direction.

38. The optical imaging device of claim 37, wherein the structural pattern comprises a plurality of open cells that are dimensionally associated with one another.

39. The optical imaging device of claim 37, wherein the structural pattern comprises a plurality of fibers that are dimensionally associated with one another.

40. The optical imaging device of claim 21, wherein the at least one illuminating plate comprises a support layer having a first surface and an opposite, second surface, a diffuser layer having a first surface and an opposite, second surface, and a space defined therebetween the first surface of the support layer and the second surface of the diffuser layer and containing ambient air.

41. The optical imaging device of claim 40, wherein the first surface of the support layer is substantially reflective to a light received by the surface.

42. The optical imaging device of claim 40, wherein the first surface of the support layer is rugged.

43. The optical imaging device of claim 40, wherein the at least one illuminating plate comprises further comprises a light aligning layer positioned on the first surface of the diffuser layer.

44. An optical imaging device for obtaining an image of a stationary image placed on an at least partially transparent platform having a first surface on which the stationary image is placed, an opposite, second surface, and a thickness, h, defined by the first surface and the second surface, comprising:

a. a reference pattern formed at a plane substantially parallel to and at a distance, d, from the first surface of the at least partially transparent platform;

b. optical means for obtaining consecutive partial images of the stationary image, wherein each of the consecutive partial images includes an at least partial image of the reference pattern; and

c. an image processing system for using the partial image of the reference pattern in each of the consecutive partial images as a reference to combine the consecutive partial images so as to form a substantially complete image of the stationary image.

45. The optical imaging device of claim 44, wherein d is greater than zero.

46. The optical imaging device of claim 45, wherein d is not substantially greater than the thickness h of the at least partially transparent platform.

47. The optical imaging device of claim 44, wherein the reference pattern has at least two colors which are substantially distinguishable from each other.

48. The optical imaging device of claim 47, wherein the reference pattern comprises a white area with a plurality of markers, each marker placed at a predetermined position in the white area, and being identifiable from the white area.

49. The optical imaging device of claim 47, wherein the reference pattern comprises a grid.

50. The optical imaging device of claim 44, wherein the optical means comprises at least one image head.

51. The optical imaging device of claim 44, wherein the optical means comprises an array of image heads.

52. The optical imaging device of claim 44, wherein the second surface of the at least partially transparent platform has an anti-reflective coating.

53. A method for obtaining an image of a stationary image placed on an at least partially transparent platform having a first surface on which the stationary image is placed, an opposite, second surface, and a thickness, h, defined by the first surface and the second surface, comprising the steps of:

a. forming a reference pattern at a plane substantially parallel to and at a distance, d, from the first surface of the at least partially transparent platform;

b. obtaining consecutive partial images of the stationary image, wherein each of the consecutive partial images includes an at least partial image of the reference pattern; and

c. using the partial image of the reference pattern in each of the consecutive partial images as a reference to combine the consecutive partial images so as to form a substantially complete image of the stationary image.

54. The method of claim 53, wherein d is greater than zero.

55. The method of claim 54, wherein d is not substantially greater than the thickness h of the at least partially transparent platform.

56. The method of claim 53, wherein the reference pattern has at least two colors which are substantially distinguishable from each other.

57. The method of claim 56, wherein the reference pattern comprises a white area with a plurality of markers, each marker placed at a predetermined position in the white area, and being identifiable from the white area.

58. The method of claim 56, wherein the reference pattern comprises a grid.

59. The method of claim 53, wherein the obtaining step is performed with at least one image head.

60. The method of claim 53, wherein the obtaining step is performed with an array of image heads.

61. An optical imaging device for obtaining an image of a stationary image placed on an at least partially transparent platform having a first surface on which the stationary image is placed, an opposite, second surface, and a thickness, h, defined by the first surface and the second surface, comprising:

two or more image heads for obtaining images of the stationary image, wherein each of the image heads has a head portion with a dimension and the two or more image heads are positioned in relation to each other to satisfy the relation of;

l<

L,

with l being a characteristic dimension of the image heads, L being a characteristic distance between two neighboring image heads.

62. The optical imaging device of claim 61, wherein the image heads are substantially identical such that l=l₁=l₂= . . . =l_N, l_i being the dimension of the ith image head, i=1, 2, . . . , N, and N being the total number of the image heads.

63. The optical imaging device of claim 61, wherein the image heads are different such that at least two of image heads may have different characteristic dimensions, and l=Max{l_i, i=1, . . . , N}, l_i being the dimension of the ith image head, i=1, 2, . . . , N, and N being the total number of the image heads.

64. The optical imaging device of claim 61, wherein the image heads are positioned in an array such that any two neighboring heads have a substantially identical minimum distance, and L=L₁=L₂= . . . =L_M, L_j being a characteristic distance between the jth pair of neighboring image heads, j=1, 2, . . . , M, and M being the total number of pairs of the neighboring image heads.

65. The optical imaging device of claim 61, wherein the image heads are positioned in an array such that different pairs of neighboring heads may have different minimum distances, and L=Min{L_j, j=1, . . . , M}, L_j being a characteristic distance between the jth pair of neighboring image heads, j=1, 2, . . . , M, and M being the total number of pairs of the neighboring image heads.

66. The optical imaging device of claim 61, further comprising a reference pattern formed at a plane substantially parallel to and at a distance, d, from the first surface of the at least partially transparent platform.

67. The optical imaging device of claim 66, wherein d is greater than zero.

68. The optical imaging device of claim 67, wherein d is not substantially greater than the thickness h of the at least partially transparent platform.

69. The optical imaging device of claim 66, wherein the reference pattern comprises a white area with a plurality of markers, each marker placed at a predetermined position in the white area, and being identifiable from the white area.

70. The optical imaging device of claim 66, wherein the reference pattern comprises a grid.

71. The optical imaging device of claim 66, wherein the two or more image heads for obtaining images of the stationary image are adapted for obtaining consecutive partial images of the stationary image, and wherein each of the consecutive partial images includes an at least partial image of the reference pattern.

72. The optical imaging device of claim 71, further comprising an image processing system for using the partial image of the reference pattern in each of the consecutive partial images as a reference to combine the consecutive partial images so as to form a substantially complete image of the stationary image.

73. The optical imaging device of claim 71, wherein the second surface of the at least partially transparent platform has an anti-reflective coating.

74. An imaging tile mountable and modulable to an optical imaging device, comprising at least one image head for obtaining an image of a stationary image.

75. The imaging tile of claim 74, wherein the imaging tile is formed in a multilayer structure.

76. The imaging tile of claim 75, wherein the multilayer structure comprises a light guiding layer having a first surface, an opposite, second surface and a lateral, third surface joined by the first surface and the second surface, and a diffuser layer deposited on the first surface of the light guiding layer.

77. The imaging tile of claim 76, wherein the multilayer structure further comprises an aligning layer deposited on the diffuser layer and adapted for aligning a light transmitted from the diffuser layer to a predetermined direction.

78. The imaging tile of claim 75, wherein the third surface of the light guiding layer has an anti-reflective coating.