Image reading apparatus
AssigneeMinolta Co., Ltd.
InventorTakayuki Nabeshima
Life of this patent
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Abstract
An image reading apparatus capable of taking full advantage of each device function and adjusting it even if each device function varies depending on respective machines. The image reading apparatus includes an illumination unit directing light toward an original document, a transducer unit transducing the light directed toward the original document and reflected therefrom to an electric signal, and a controller controlling the amount of light from the illumination unit according to a saturation characteristic and a frequency characteristic of the transducer unit.
Claims19
An image reading apparatus comprising:
- illumination means for directing light toward an original document;
- a transducer unit for converting said light directed toward said original document and reflected therefrom to an electric signal;
- and
- light amount control means for controlling an amount of light from said illumination means according to a saturation characteristic and a frequency characteristic of said transducer unit.
An image reading apparatus comprising:
- illumination means for directing light toward an original document;
- a transducer unit for converting said light directed toward said original document and reflected therefrom to an electric signal;
- change means for changing a time for accumulating an amount of light at said transducer unit;
- and
- accumulation time control means for controlling a time for accumulating an amount of light at said change unit according to a saturation characteristic and a frequency characteristic of said transducer unit.
An image reading apparatus comprising:
- an illuminator to produce light and cast such light toward an original document;
- a transducer unit for converting light reflected from such an original document to an electric signal;
- and
- a controller to control an amount of light produced by the illuminator in accordance with a saturation characteristic and an operational slew rate of at least the transducer unit.
A method for controlling an output light quantity of an illuminator for an image reading apparatus comprising the steps of:
- illuminating a prescribed pattern with illumination, at an initial intensity, whereas light reflected from the pattern is received by a transducer unit having at least a photoelectric device to convert detected light into corresponding electrical signals;
- calculating a transducer unit saturation level based on the detected light and an operational slew rate of at least the transducer unit;
- and
- depending upon a calculated saturation level, modifying an operational intensity of the illuminator for purposes of illuminating an original.
Dependencies are inferred from the claim text.