Contact image sensor, output correction device for contact image sensor, and output correction method for contact image sensor
AssigneeMitsubishi Electric Corporation
InventorTohru Aramaki
Life of this patent
Estimating the term…
Abstract
A light source unit emits light for irradiating a document. A light guide in which light emitted from the light source unit propagates has a first exit part for emitting light to the document and a second exit part, which is a different part from the first light part, for emitting light to the outside. A corrective light receiver is disposed in an area receiving direct light of the light emitted from the second exit part, and outputs reference data corresponding to the direct light. A controller compares predetermined criterion data with the reference data output from the corrective light receiver, and performs processing for correcting a bright output based on a result of the comparison.
Claims5
A contact image sensor comprising:
- a light source that emits light for irradiating a target to be read;
- a light guide in which the light emitted from the light source and entering entrance parts disposed at both ends of the light guide in a main scanning direction propagates, the light guide having a first exit part for emitting the light to the target to be read and second exit parts disposed at the both ends of the light guide in the main scanning direction, for emitting the light to the outside;
- a first corrective light receiver that (i) is disposed in an area receiving direct light of light that enters from one end of the light guide and is emitted from a second exit part of the other end of the light guide and excluding light that enters from the other end of the light guide and is emitted from the light source and (ii) outputs reference data corresponding to the direct light;
- a second corrective light receiver that (i) is disposed in an area receiving direct light of light that enters from the other end of the light guide and is emitted from a second exit part of the one end of the light guide and excluding light that enters from the one end of the light guide and is emitted from the light source and (ii) outputs reference data corresponding to the direct light;
- a reading light receiver that generates image data representing an image of the target to be read by photoelectrically converting the light emitted from the first exit part and reflected by the target to be read;
- and
- a corrector that compares (i) predetermined criterion data as a criterion value for determining whether or not to correct a bright output represented by the image data generated by the reading light receiver when the target to be read is white with (ii) reference data output from the first and second corrective light receivers and, based on a result of the comparison, performs processing for correcting the bright output.
Dependencies are inferred from the claim text.