Apparatus for compensation for spectral fluctuation of a light source and a scanner incorporating said apparatus
First Claim
1. An apparatus for compensation for spectral fluctuation of a light source comprising:
- a lamp for generating light, the light from the lamp having spectral variations;
a sensor means for determining the amount of light reaching said sensor means;
a spectral monitor means for determining the spectral content of the light from said lamp, the spectral monitor means comprising at least two sensor devices with at least two different spectral responses that are a weighted combination of a 0th principal component and one additional principal component of the spectral variations in the light from the lamp;
a light directing device receiving said light from said lamp and directing said light towards said spectral monitor means and said sensor means; and
a signal processing means which receives the output from said spectral monitor means and said sensor means for producing a signal compensated for spectral fluctuations.
9 Assignments
0 Petitions
Accused Products
Abstract
The invention discloses an apparatus for compensation for spectral fluctuation of a light source. Additionally the invention discloses a scanner incorporating the apparatus for compensation. A lamp generates light, which is sent into a light directing device. From the light directing device a sensor means and a spectral monitor means for determining the spectral content of the light from said lamp receive the light. A signal processing means receives the output from said spectral monitor means and said sensor means for producing a signal compensated for spectral fluctuations. A scanner, incorporating the inventive apparatus, additionally comprises a medium for scanning which is positioned between said sensor means and said light directing device and a lens is positioned between said medium for scanning and said sensor means, for imaging said medium onto said sensor means.
46 Citations
20 Claims
-
1. An apparatus for compensation for spectral fluctuation of a light source comprising:
-
a lamp for generating light, the light from the lamp having spectral variations;
a sensor means for determining the amount of light reaching said sensor means;
a spectral monitor means for determining the spectral content of the light from said lamp, the spectral monitor means comprising at least two sensor devices with at least two different spectral responses that are a weighted combination of a 0th principal component and one additional principal component of the spectral variations in the light from the lamp;
a light directing device receiving said light from said lamp and directing said light towards said spectral monitor means and said sensor means; and
a signal processing means which receives the output from said spectral monitor means and said sensor means for producing a signal compensated for spectral fluctuations. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. An apparatus for compensation for spectral fluctuation of a light source comprising:
-
a lamp for generating light;
a sensor means for determining the amount of light reaching said sensor means;
a spectral monitor means, having at least two sensor devices with at least two different spectral responses, wherein each sensor device has a spectral response that is a weighted combination of a 0th principal component and one additional principal component of the spectral variations in the light from the lamp;
an integrating cavity for directing said light towards said spectral monitor means and said sensor means; and
a signal processing means which receives the output from the spectral monitor means and the sensor means for producing a signal compensated for spectral fluctuations. - View Dependent Claims (9, 10, 11, 12, 13)
-
-
14. A scanner comprising:
-
an apparatus for compensation for spectral fluctuation of a light source having;
a lamp for generating light;
a sensor means for determining the amount of light reaching said sensor means;
a spectral monitor means for determining the spectral content of the light from said lamp, the spectral monitor means including a plurality of sensor devices having different spectral responses, wherein each sensor device has a spectral response that is a weighted combination of a 0th principal component and one additional principal component of the spectral variations in the light from the lamp;
a light directing device receiving said light from said lamp and directing said light towards said spectral monitor means and said sensor means;
a signal processing means which receives the output from the spectral monitor means and the sensor means for producing a signal compensated for spectral fluctuations;
a medium for scanning; and
a lens positioned in relation to said medium for scanning and said sensor means, for imaging said medium onto said sensor means. - View Dependent Claims (15, 16, 17, 18, 19, 20)
-
Specification