Original illuminating device and original reading device preventing random reflected light
AssigneeCanon Kabushiki Kaisha
InventorsHiromichi Nagane, Koji Takahashi
Life of this patent
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Abstract
An original illuminating device includes LED (light-emitting diode) chips and a lens for condensing light emitted from the LED chips on an original-reading position, on the same substrate. The device is configured so as to prevent randomly-reflected light in the device from being specularly reflected by an original-mount glass toward a reading device. Since the specularly-reflected light is not incident upon the reading device, only light corresponding to an image on an original is incident upon the reading device. It is therefore possible to correctly read the original.
Claims22
An original illuminating device comprising:
- a substrate;
- a plurality of light-emitting devices, disposed on said substrate, for emitting light to illuminate an original;
- a plurality of electrodes, disposed on said substrate, for passing current through said plurality of light-emitting devices, said plurality of light-emitting devices and said plurality of electrodes being provided on a same surface of said substrate;
- and
- anti-reflection means, provided on said plurality of electrodes, for preventing light from being reflected from said plurality of electrodes.
An original illuminating device comprising:
- a plurality of light-emitting devices for emitting light to illuminate an original;
- a plurality of electrodes, each provided for a corresponding one of said plurality of light-emitting devices, for passing current through said plurality of light-emitting devices, said plurality of electrodes being linearly arranged;
- and
- anti-reflection means, provided on said plurality of electrodes, for preventing light from being reflected from said plurality of electrodes.
An original reading device comprising:
- a plurality of light-emitting devices for emitting light to illuminate an original;
- a plurality of electrodes for passing current through said plurality of light-emitting devices;
- a photosensing member for receiving light reflected by the original illuminated by said plurality of light-emitting devices to read an image on the original;
- and
- anti-reflection means for preventing light reflected by said plurality of electrodes from reaching said photosensing member.
Dependencies are inferred from the claim text.