Light guide illuminating device having the light guide, and image reading device and information processing apparatus having the illuminating device
First Claim
1. A longitudinal light guide, for guiding light introduced from a light source and for emitting the light along a longitudinal side thereof, having a longitudinal reflection member arranged along said light guide for reflecting the light from said light source, wherein an intensity of the light reflected by said reflection member is larger near said light source than the light reflected by other parts of said reflection member, and wherein, at least at an end of said reflection member near said light source, a normal line passing through a center of a width of said reflection member is shifted from a center of said light source, when viewed in a longitudinal direction of said light guide, for weakening the intensity of the light reflected by said reflection member near said light source.
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Accused Products
Abstract
There is disclosed an illumination device in which a light guide is adapted to emit the light from a face thereof and is provided with an area, on a face opposite to the light emitting face, for diffusing and/or reflecting the light introduced into the light guide from an end face thereof or is provided with uneven light emitting characteristics along the longitudinal direction of the light guide, and the center of the light source positioned at the end of the light guide is placed at a position aberrated from the normal line to the area, whereby attained are compactness, a low cost, a low electric power consumption, a high efficiency of utilization of the light emitted by the light source, and excellent and uniform illumination characteristics. There are also disclosed an image reading device and an information processing apparatus, equipped with the above-mentioned illumination device.
84 Citations
158 Claims
- 1. A longitudinal light guide, for guiding light introduced from a light source and for emitting the light along a longitudinal side thereof, having a longitudinal reflection member arranged along said light guide for reflecting the light from said light source, wherein an intensity of the light reflected by said reflection member is larger near said light source than the light reflected by other parts of said reflection member, and wherein, at least at an end of said reflection member near said light source, a normal line passing through a center of a width of said reflection member is shifted from a center of said light source, when viewed in a longitudinal direction of said light guide, for weakening the intensity of the light reflected by said reflection member near said light source.
- 5. An illumination device provided with a longitudinal light guide, said longitudinal light guide being adapted for guiding light introduced from a light source and for emitting the light along a longitudinal side thereof, having a longitudinal reflection member arranged along said light guide for reflecting the light from said light source, wherein an intensity of the light reflected by said reflection member is larger near said light source than the light reflected by other parts of said reflection member, and wherein, at least at an end of said reflection member near said light source, a normal line passing through a center of a width of said reflection member is shifted from a center of said light source, when viewed in a longitudinal direction of said light guide, for weakening the intensity of the light reflected by said reflection member near said light source.
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10. An image reading device comprising:
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(a) an illumination device provided with a longitudinal light guide, said longitudinal light guide being adapted for guiding a light introduced from a light source and for emitting the light along a longitudinal side thereof, having a longitudinal reflection member arranged along said light guide for reflecting the light from said light source, wherein an intensity of the light reflected by said reflection member is larger near said light source than the light reflected by other parts of said reflection member, and wherein, at least at an end of said reflection member near said light source, a normal line passing through a center of a width of said reflection member is shifted from a center of the light source, when viewed in a longitudinal direction of said light guide, for weakening the intensity of the light reflected by said reflection member near said light source; and (b) a photoelectric converting device having a plurality of photoelectric converting elements for reading an image illuminated by said illumination device and for outputting an image signal. - View Dependent Claims (11, 12, 13)
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14. An information processing system comprising:
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(a) an illumination device provided with a longitudinal light guide, said longitudinal light guide being adapted for guiding light introduced from a light source and for emitting the light along a longitudinal side thereof, having a longitudinal reflection member arranged along said light guide for reflecting the light from said light source, wherein an intensity of the light reflected by said reflection member is larger near said light source than the light reflected by other parts of said reflection member, and wherein, at least at an end of said reflection member near said light source, a normal line passing through a center of a width of said reflection member is shifted from a center of the light source, when viewed in a longitudinal direction of said light guide, for weakening the intensity of the light reflected by said reflection member near said light source; (b) a photoelectric converting device having a plurality of photoelectric converting elements for reading an image illuminated by said illumination device and for outputting an image signal; (c) a processor for processing the image signal; and (d) a controller for controlling said illumination device, said photoelectric converting device and said processor. - View Dependent Claims (15, 16, 17, 18)
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- 19. A longitudinal light guide, for guiding light introduced from a light source and for emitting the light along a longitudinal side thereof, having a longitudinal reflection member arranged along said light guide for reflecting the light from said light source, wherein, at least at an end of said reflection member near said light source, a normal line passing through a center of a width of said reflection member is shifted from a center of said light source, when viewed in a longitudinal direction of said light guide.
- 23. A longitudinal light guide, for guiding light introduced from a plurality of light sources and for emitting the light along a longitudinal side thereof, having a longitudinal reflection member arranged along said light guide for reflecting the light from said plurality of light sources, wherein, at least at an end of said reflection member near said plurality of light sources, a normal line passing through a center of a width of said reflection member is shifted from a center of at least one of said plurality of light sources, when viewed in a longitudinal direction of said light guide.
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27. An image reading device comprising:
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(a) an illumination device provided with a longitudinal light guide, for guiding light introduced from a light source and for emitting the light along a longitudinal side thereof, having a longitudinal reflection member arranged along said light guide for reflecting the light from said light source, wherein, at least at an end of said reflection member near said light source, a normal line passing through a center of a width of said reflection member is shifted from a center of said light source, when viewed in a longitudinal direction of said light guide; and (b) a photoelectric converting device having a plurality of photoelectric conversion elements for reading an image illuminated by said illumination device and for outputting an image signal. - View Dependent Claims (28, 29, 30)
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31. An information processing apparatus comprising:
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(a) an illumination device provided with a longitudinal light guide, for guiding light introduced from a light source and for emitting the light along a longitudinal side thereof, having a longitudinal reflection member arranged along said light guide for reflecting the light from said light source, wherein, at least at an end of said reflection member near said light source, a normal line passing through a center of a width of said reflection member is shifted from a center of said light source, when viewed in a longitudinal direction of said light guide; (b) a photoelectric converting device having a plurality of photoelectric conversion elements for reading an image illuminated by said illumination device and for outputting an image signal; and (c) control circuits for controlling said illumination device and said photoelectric converting device. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39)
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40. An information transmitting apparatus comprising:
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(a) an illumination device provided with a longitudinal light guide, for guiding light introduced from a light source and for emitting the light along a longitudinal side thereof, having a longitudinal reflection member arranged along said light guide for reflecting the light from said light source, wherein, at least at an end of said reflection member near said light source, a normal line passing through a center of a width of said reflection member is shifted from a center of said light source, when viewed in a longitudinal direction of said light guide; (b) a photoelectric converting device having a plurality of photoelectric conversion elements for reading an image illuminated by said illumination device and for forming an image signal; and (c) transmission means for transmitting the image signal to an external processing apparatus for processing the image signal. - View Dependent Claims (41, 42, 43, 44, 45, 46, 47)
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48. An information reading apparatus comprising:
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(a) an illumination device provided with a longitudinal light guide, for guiding light introduced from a light source and for emitting the light along a longitudinal side thereof, having a longitudinal reflection member arranged along said light guide for reflecting the light from said light source, wherein, at least at an end of said reflection member near said light source, a normal line passing through a center of a width of said reflection member is shifted from a center of said light source, when viewed in a longitudinal direction of said light guide; (b) a photoelectric converting device having a plurality of photoelectric conversion elements for reading an image illuminated by said illumination device and for forming an image signal; and (c) drive means for shifting a positional relationship between the image illuminated by said illumination device and said photoelectric converting device. - View Dependent Claims (49, 50, 51, 52, 53, 54, 55, 56, 57)
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58. An image reading device comprising:
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(a) an illumination device provided with a longitudinal light guide, for guiding light introduced from a plurality of light sources and for emitting the light along a longitudinal side thereof, having a longitudinal reflection member arranged along said light guide for reflecting the light from said plurality of light sources, wherein, at least at an end of said reflection member near said plurality of light sources, a normal line passing through a center of a width of said reflection member is shifted from a center of at least one of said plurality of light sources, when viewed in a longitudinal direction of said light guide; and (b) a photoelectric converting device having a plurality of photoelectric conversion elements for reading an image illuminated by said illumination device and for outputting an image signal. - View Dependent Claims (59, 60, 61)
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62. An information processing apparatus comprising:
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(a) an illumination device provided with a longitudinal light guide, for guiding light introduced from a plurality of light sources and for emitting the light along a longitudinal side thereof, having a longitudinal reflection member arranged along said light guide for reflecting the light from said plurality of light sources, wherein, at least at an end of said reflection member near said plurality of light sources, a normal line passing through a center of a width of said reflection member is shifted from a center of at least one of said plurality of light sources, when viewed in a longitudinal direction of said light guide; (b) a photoelectric converting device having a plurality of photoelectric conversion elements for reading an image illuminated by said illumination device and for outputting an image signal; (c) a processor for processing the image signal output by said photoelectric converting device; and (d) control circuits for controlling said illumination device, said photoelectric conversion device, and said processor. - View Dependent Claims (63, 64, 65, 66, 67, 68, 69, 70)
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71. An information transmitting apparatus comprising:
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(a) an illumination device provided with a longitudinal light guide for guiding light introduced from a plurality of light sources and for emitting the light along a longitudinal side thereof, having a longitudinal reflection member arranged along said light guide for reflecting the light from said plurality of light sources, wherein, at least at an end of said reflection member near said plurality of light sources, a normal line passing through a center of a width of said reflection member is shifted from a center of at least one of said plurality of light sources, when viewed in a longitudinal direction of said light guide; (b) a photoelectric converting device having a plurality of photoelectric conversion elements for reading an image illuminated by said illumination device and for forming an image signal; and (c) transmission means for transmitting the image signal to an external processing apparatus for processing the image signal. - View Dependent Claims (72, 73, 74, 75, 76, 77, 78)
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79. An information reading apparatus comprising:
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(a) an illumination device provided with a longitudinal light guide, for guiding light introduced from a plurality of light sources and for emitting the light along a longitudinal side thereof, having a longitudinal reflection member arranged along said light guide for reflecting the light from said plurality of light sources, wherein, at least at an end of said reflection member near said plurality of light sources, a normal line passing through a center of a width of said reflection member is shifted from a center of at least one of said plurality of light sources, when viewed in a longitudinal direction of said light guide; (b) a photoelectric converting device having a plurality of photoelectric conversion elements for reading an image illuminated by said illumination device and for forming an image signal; and (c) drive means for shifting a positional relationship between the image illuminated by said illumination device and said photoelectric converting device. - View Dependent Claims (80, 81, 82, 83, 84, 85, 86, 87, 88)
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89. A light guide comprising:
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a longitudinal surface that extends in a longitudinal direction of said light guide; an end surface disposed at one longitudinal end of said longitudinal surface; a plurality of light sources disposed on said end surface; and a longitudinal reflection member disposed on said longitudinal surface, wherein a reflection member normal line that passes through a center of a width of said longitudinal reflection member is shifted, at least at an end of said longitudinal reflection member near said end surface, from a center of at least one of said plurality of light sources, when viewed in the longitudinal direction of said light guide. - View Dependent Claims (90, 91, 92)
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93. An image reading device comprising:
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(a) an illumination device provided with a longitudinal light guide, for guiding light introduced from a plurality of light sources and for emitting the light along a longitudinal side thereof, having a longitudinal surface that extends in a longitudinal direction of said light guide;
an end surface disposed at one longitudinal end of said longitudinal surface;
a plurality of light sources disposed on said end surface; and
a longitudinal reflection member disposed on said longitudinal surface, wherein a reflection member normal line that passes through a center of a width of said longitudinal reflection member is shifted, at least at an end of said longitudinal reflection member near said end surface, from a center of at least one of said plurality of light sources, when viewed in the longitudinal direction of said light guide; and(b) a photoelectric converting device having a plurality of photoelectric conversion elements for reading an image illuminated by said illumination device and for outputting an image signal. - View Dependent Claims (94, 95, 96)
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97. An information processing apparatus comprising:
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(a) an illumination device provided with a longitudinal light guide, for guiding light introduced from a plurality of light sources and for emitting the light along a longitudinal side thereof, having a longitudinal surface that extends in a longitudinal direction of said light guide;
an end surface disposed at one longitudinal end of said longitudinal surface;
a plurality of light sources disposed on said end surface; and
a longitudinal reflection member disposed on said longitudinal surface, wherein a reflection member normal line that passes through a center of a width of said longitudinal reflection member is shifted, at least at an end of said longitudinal reflection member near said end surface, from a center of at least one of said plurality of light sources, when viewed in the longitudinal direction of said light guide;(b) a photoelectric converting device having a plurality of photoelectric conversion elements for reading an image illuminated by said illumination device and for outputting an image signal; and (c) control circuits for controlling said illumination device and said photoelectric converting device. - View Dependent Claims (98, 99, 100, 101, 102, 103, 104, 105)
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106. An information transmitting apparatus comprising:
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(a) an illumination device provided with a longitudinal light guide, for guiding light introduced from a plurality of light sources and for emitting the light along a longitudinal side thereof, having a longitudinal surface that extends in a longitudinal direction of said light guide;
an end surface disposed at one longitudinal end of said longitudinal surface;
a plurality of light sources disposed on said end surface; and
a longitudinal reflection member disposed on said longitudinal surface, wherein a reflection member normal line that passes through a center of a width of said longitudinal reflection member is shifted, at least at an end of said longitudinal reflection member near said end surface, from a center of at least one of said plurality of light sources, when viewed in the longitudinal direction of said light guide;(b) a photoelectric converting device having a plurality of photoelectric conversion elements for reading an image illuminated by said illumination device and for forming an image signal; and (c) transmission means for transmitting the image signal to an external processing apparatus for processing the image signal. - View Dependent Claims (107, 108, 109, 110, 111, 112, 113)
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114. An information reading apparatus comprising:
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(a) an illumination device provided with a longitudinal light guide, for guiding light introduced from a plurality of light sources and for emitting the light along a longitudinal side thereof, having a longitudinal surface that extends in a longitudinal direction of said light guide;
an end surface disposed at one longitudinal end of said longitudinal surface;
a plurality of light sources disposed on said end surface; and
a longitudinal reflection member disposed on said longitudinal surface, wherein a reflection member normal line that passes through a center of a width of said longitudinal reflection member is shifted, at least at an end of said longitudinal reflection member near said end surface, from a center of at least one of said plurality of light sources, when viewed in the longitudinal direction of said light guide;(b) a photoelectric converting device having a plurality of photoelectric conversion elements for reading an image illuminated by said illumination device and for forming an image signal; and (c) drive means for shifting a positional relationship between the image illuminated by said illumination device and said photoelectric converting device. - View Dependent Claims (115, 116, 117, 118, 119, 120, 121, 122, 123)
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124. A light guide comprising:
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a longitudinal surface that extends in a longitudinal direction of said light guide; an end surface disposed at one longitudinal end of said longitudinal surface; a longitudinal reflection member disposed on said longitudinal surface; and a plurality of light sources disposed on said end surface, wherein at least one of said plurality of light sources is shifted from a normal plane that passes through a center of a width of said longitudinal reflection member. - View Dependent Claims (125, 126, 127)
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128. An image reading device comprising:
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(a) an illumination device provided with a longitudinal light guide, for guiding light introduced from a plurality of light sources and for emitting the light along a longitudinal side thereof, having a longitudinal surface that extends in a longitudinal direction of said light guide;
an end surface disposed at one longitudinal end of said longitudinal surface;
a longitudinal reflection member disposed on said longitudinal surface; and
a plurality of light sources disposed on said end surface, wherein at least one of said plurality of light sources is shifted from a normal plane that passes through a center of a width of said longitudinal reflection member; and(b) a photoelectric converting device having a plurality of photoelectric conversion elements for reading an image illuminated by said illumination device and for outputting an image signal. - View Dependent Claims (129, 130, 131)
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132. An information processing apparatus comprising:
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(a) an illumination device provided with a longitudinal light guide, for guiding light introduced from a plurality of light sources and for emitting the light along a longitudinal side thereof, having a longitudinal surface that extends in a longitudinal direction of said light guide;
an end surface disposed at one longitudinal end of said longitudinal surface;
a longitudinal reflection member disposed on said longitudinal surface; and
a plurality of light sources disposed on said end surface, wherein at least one of said plurality of light sources is shifted from a normal plane that passes through a center of a width of said longitudinal reflection member;(b) a photoelectric converting device having a plurality of photoelectric conversion elements for reading an image illuminated by said illumination device and for outputting an image signal; and (c) control circuits for controlling said illumination device and said photoelectric converting device. - View Dependent Claims (133, 134, 135, 136, 137, 138, 139, 140)
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141. An information transmitting apparatus comprising:
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(a) an illumination device provided with a longitudinal light guide, for guiding light introduced from a plurality of light sources and for emitting the light along a longitudinal side thereof, having a longitudinal surface that extends in a longitudinal direction of said light guide;
an end surface disposed at one longitudinal end of said longitudinal surface;
a longitudinal reflection member disposed on said longitudinal surface; and
a plurality of light sources disposed on said end surface, wherein at least one of said plurality of light sources is shifted from a normal plane that passes through a center of a width of said longitudinal reflection member;(b) a photoelectric converting device having a plurality of photoelectric conversion elements for reading an image illuminated by said illumination device and for forming an image signal; and (c) transmission means for transmitting the image signal to an external processing apparatus for processing the image signal. - View Dependent Claims (142, 143, 144, 145, 146, 147, 148)
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149. An information reading apparatus comprising:
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(a) an illumination device provided with a longitudinal light guide, for guiding light introduced from a plurality of light sources and for emitting the light along a longitudinal side thereof, having a longitudinal surface that extends in a longitudinal direction of said light guide;
an end surface disposed at one longitudinal end of said longitudinal surface;
a longitudinal reflection member disposed on said longitudinal surface; and
a plurality of light sources disposed on said end surface, wherein at least one of said plurality of light sources is shifted from a normal plane that passes through a center of a width of said longitudinal reflection member;(b) a photoelectric converting device having a plurality of photoelectric conversion elements for reading an image illuminated by said illumination device and for forming an image signal; and (c) drive means for shifting a positional relationship between the image illuminated by said illumination device and said photoelectric converting device. - View Dependent Claims (150, 151, 152, 153, 154, 155, 156, 157, 158)
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Specification