Lightguide type illumination device with symmetrically arranged multiple color light sources
AssigneeHewlett-Packard Development Company, L.P.
InventorKyoungrok KIM
Life of this patent
Estimating the term…
Abstract
An illumination device includes a light guide member having a first side in a main scanning direction and a second side in a sub-scanning direction and a plurality of light sources including first light emitters respectively to emit beams of light of a first color and a second light emitter to emit a beam of light of a second color different from the first color toward an inside of the light guide member via a side of the light guide member in the main scanning direction. The first light emitters are positioned in the sub-scanning direction to be symmetrical to each other.
Claims15
An illumination device for a scanner, the illumination device comprising:
- a light guide member having a first side in a main scanning direction of the scanner and a second side in a sub-scanning direction of the scanner, the light guide member having a light exit portion provided at one end of the light guide member in the sub-scanning direction to allow light to exit;
- and
- a plurality of light sources including first light emitters respectively to emit beams of light of a first color and a second light emitter to emit a beam of light of a second color different from the first color, toward an inside of the light guide member, via the second side of the light guide member, and in the main scanning direction,
- wherein the first light emitters are positioned in the sub-scanning direction and positioned to be symmetrical to each other.
An image reading module couplable to a scanner comprising:
- an illumination device to irradiate a document with light, the illumination device including:
- a light guide member having a first side in a main scanning direction and a second side in a sub-scanning direction, the light guide member having a light exit portion provided at one end of the light guide member in the sub-scanning direction to allow light to exit toward the document, and
- a plurality of light sources including first light emitters respectively to emit beams of light of a first color and a second light emitter to emit a beam of a second color different from the first color, toward an inside of the light guide member, via the second side of the light guide member, and in the main scanning direction, the first light emitters positioned in the sub-scanning direction and positioned to be symmetrical to each other;
- an image sensor having a side in the main scanning direction;
- and
- an imaging optical system to focus light reflected from the document onto the image sensor.
A scanner comprising:
- a document board on which a document is to be placed;
- and
- an image reading module including:
- an image sensor, and
- an imaging optical system to focus light reflected from the document onto the image sensor, to imaging optical system to move in a sub-scanning direction;
- and
- an illumination device to irradiate the document with light, the illumination device including:
- a light guide member having a first side in a main scanning direction of the scanner and a second side in the sub-scanning direction of the scanner, the light guide member having a light exit portion provided at one end of the light guide member in the sub-scanning direction to allow light to exit toward the document, and
- a plurality of light sources including first light emitters respectively to emit beams of light of a first color and a second light emitter to emit a beam of a second color different from the first color, toward an inside of the light guide member, via the second side of the light guide member, and in the main scanning direction,
- wherein the first light emitters are positioned in the sub-scanning direction to be symmetrical to each other.
Dependencies are inferred from the claim text.