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US 7,746,520 B2Granted
Document illuminator
AssigneeXerox Corporation
InventorsRobert Herloski, John C. Juhasz, Douglas E. Proctor, Charles J. Urso, Jr.
Life of this patent
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Abstract
A document illuminator comprising a light-transmissive element having an embedded side emitting LED fitted in a cavity formed therein. The light-transmissive element is formed with one or more optical notches and is totally encased in a white surround to yield total internal reflection of the light rays emanating from the LED. The reflected light rays are collected at an aperture which in turn transmits high power and highly uniform illumination profile to illuminate a document.
Claims25
A device comprising:
- a light-transmissive element (LTE);
- a cavity formed in said LTE;
- a light-emitting diode (LED) positioned inside said cavity so as to directly emit light within the LTE;
- an aperture formed in said LTE positioned to receive light emitted from said LED that is internally reflected by the LTE, wherein said light traverses said aperture to illuminate a document;
- and
- one or more devices arranged between the LED and the aperture such that light emitted from the LED directly toward the aperture is internally reflected within the LTE,
- wherein said light-transmissive element has a height from about 20 mm to about 25 mm, and a width ranging from about 2 mm to about 6 mm.
4 more elements
An device comprising
- a light-transmissive element (LTE) having an aperture and an LED embedded within said LTE so as to directly emit light within the LTE, wherein light emitted from said LED is internally reflected by the LTE to said aperture and traverses said aperture, to illuminate a document;
- one or more devices arranged between the LED and the aperture such that light emitted from the LED directly toward the aperture is internally reflected within the LTE;
- a lens adapted to receive a reflected image of said document and to focus said reflected image on to an array of sensors to convert the images to electronic signals;
- and
- a memory storage device to record said electronic signals as digital data,
- wherein said light-transmissive element has a height from about 20 mm to about 25 mm, and a width ranging from about 2 mm to about 6 mm.
3 more elements
Dependencies are inferred from the claim text.