Patent ID: 8228568
Filing Date: 2012-07-24
Classification: H04N

Abstract:
1. A document read apparatus for readinq an imaqe recorded on a document, comprising: a light emitting unit having a first light source and a second light source that emit light to a document; a light reception unit that receives the light reflected by the document; an optical system that conducts the light reflected by the document to the light reception unit; a light quantity control unit that separately controls a light quantity of the light emitted by the first light source and a light quantity of the light emitted by the second light source; and a movement control unit that moves the light emitting unit held to face the document; wherein the first light source and the second light source are linear light sources whose longitudinal directions are across a moving direction of the light emitting unit moved by the movement control unit, and are arranged in parallel to the moving direction; the light conducted by the optical system has passed between the first light source and the second light source; and the light quantity control unit separately controls, in accordance with a position of the light emitting unit moved by the movement control unit, the light quantity of the light emitted by the first light source and the light quantity of the light emitted by the second light source; and wherein when a position of the light emitting unit is shifted by over a predetermined distance toward a first light source side from a center position for emitting light to a center of the document in the moving direction, the light quantity control unit makes the light quantity of the light emitted by the first light source and the light quantity of the light emitted by the second light source equal to each other; when a position of the light emitting unit is shifted by under the predetermined distance toward the first light source side from the center position for emitting light to the center of the document in the moving direction, the light quantity control unit makes the light quantity of the light emitted by the second light source become larger than the light quantity of the light emitted by the first light source; when a position of the light emitting unit is shifted by under a predefined distance toward a second light source side from the center position for emitting light to the center of the document in the moving direction, the light quantity control unit makes the light quantity of the light emitted by the first light source become larger than the light quantity of the light emitted by the second light source; and when a position of the light emitting unit is shifted by over the predefined distance toward the second light source side from the center position for emitting light to the center of the document in the moving direction, the light quantity control unit makes the light quantity of the light emitted by the first light source and the light quantity of the light emitted by the second light source equal to each other.