Image signal correction light source that can cope with dust and scratch on transparent document, and its control

An image reading apparatus comprising:

• an illumination unit adapted to irradiate an object with first and second light rays in different frequency ranges;
• a light-receiving unit adapted to receive light coming from the object, and to output a signal;
• a read controller adapted to read an image of the object by moving said illumination unit and said light-receiving unit relative to the object;
• a drive signal supply unit adapted to supply drive signals to said light-receiving unit to sequentially turn on the second light ray at a plurality of timings to sandwich an ON timing of the first light ray, and to output a first signal in response to irradiation with the first light ray, and a second signal in response to irradiation with the second light ray, upon reading image information for one line by said light-receiving unit;
• and
• a signal controller adapted to control to average or add a plurality of pieces of image information in one line obtained at the plurality of ON timings for each of the first and second signals.

An image sensing apparatus comprising:

• a fist light source unit having a line shape adapted to irradiate an object with light in a first frequency range;
• a second light source unit having a line shape adapted to irradiate the object with light in a second frequency range which is different from the first frequency range and has an invisible light range;
• a photoelectric conversion unit including a plurality of line sensors which receive light coming from the object irradiated with light emitted by said first and second light source units and output electrical signals;
• and
• a first optical unit, arranged on an optical axis of said second light source unit, adapted to converge light from said second light source unit, wherein an edge of said optical unit ends between said first and second light source units.

An image sensing apparatus comprising:

• a fist light source unit having a line shape adapted to irradiate an object with light in a first frequency range;
• a second light source unit having a line shape adapted to irradiate the object with light in a second frequency range which is different from the first frequency range and has an invisible light range;
• a photoelectric conversion unit including a plurality of line sensors which receive light coming from the object irradiated with light emitted by said first and second light source units and output electrical signals;
• and
• a first optical unit, arranged on an optical axis of said first light source unit, adapted to homogeneously distribute the light emitted by said first light source unit within a predetermined illumination range, wherein said first optical unit ends between said first and second light source units.

An illumination device comprising:

• a fist light source unit having a line shape adapted to irradiate an object with light in a first frequency range;
• a second light source unit having a line shape adapted to irradiate the object with light in a second frequency range which is different from the first frequency range and has an invisible light range;
• and
• a first optical unit, arranged on an optical axis of said second light source unit, adapted to converge light from said second light source unit, wherein an edge of said optical unit ends between said first and second light source units.

An illumination device comprising:

• a fist light source unit having a line shape adapted to irradiate an object with light in a first frequency range;
• a second light source unit having a line shape adapted to irradiate the object with light in a second frequency range which is different from the first frequency range and has an invisible light range;
• and
• a first optical unit, arranged on an optical axis of said first light source unit, adapted to homogeneously distribute the light emitted by said first light source unit within a predetermined illumination range, wherein said first optical unit ends between said first and second light source units.