US 8,559,074 B2 · Illumination device for an image capture system

Abstract

An illumination device for an image capture system according to one example embodiment includes an integrating light pipe having an input face and an output face. The integrating light pipe is positioned to receive light from a light source at the input face and transmit the light at the output face. A projection element is positioned to focus the light from the output face to a document plane to be imaged by an image sensor. A uniformity correction device is positioned to attenuate the light from the output face so that the light has a substantially uniform intensity at the image sensor and a less uniform intensity at the document plane than at the image sensor.

Claims22

Dependent claims

An illumination device for an image capture system, comprising:

an integrating light pipe having an input face and an output face and being positioned to receive light from a light source at said input face and transmit the light at said output face;
a projection element positioned to focus the light from said output face to a document plane to be imaged by an image sensor;
and
a uniformity correction device positioned to attenuate the light from said output face so that the light has a substantially uniform intensity at said image sensor and a less uniform intensity at said document plane than at said image sensor.

1 more element

An illumination device for an image capture system, comprising:

a document plane for positioning a document to be imaged;
an image sensor positioned to capture an image of said document plane;
a light source for illuminating said document plane that includes an array of red, blue and green light emitting diodes;
an integrating light pipe having an input face and an output face and being positioned to receive light from said light source at said input face and transmit the light at said output face;
a projection element positioned to focus the light from said output face to said document plane;
and
a uniformity correction device positioned to attenuate the light from said output face so that the light has a substantially uniform intensity at said image sensor and a less uniform intensity at said document plane than at said image sensor.

4 more elements

Dependencies are inferred from the claim text.

Illumination device for an image capture system

Life of this patent

Illumination device for an image capture system

Life of this patent

Abstract

Claims22