Image reading apparatus, image forming apparatus, and image forming method
First Claim
1. An image reading apparatus for reading a color document as a monochrome image, comprising:
- a composite light source that irradiates the color document and includes plural light sources different in spectral distribution;
a sensor configured to detect an intensity of a reflected light from the color document;
a light emission ratio setting unit configured to changeably set light emission ratios different for the respective light sources; and
a light source control unit to control effective light amounts of the plural light sources with the set light emission ratios.
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Abstract
In an image reading apparatus for reading a color document as a monochrome image, an image forming apparatus of the invention includes a composite light source that irradiates the color document and includes plural light sources different in spectral distribution, a sensor to detect the intensity of a reflected light from the color document, a light emission ratio setting unit to changeably set light emission ratios different for the respective light sources, and a light source control unit to control effective light amounts of the plural light sources with the set light emission ratios. According to the image forming apparatus of the invention, when the color document is monochromatically read, the reading is performed with the brightness close to the human visual sensitivity, the user can changeably set color sensitivity, and uneven density can be reduced.
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Citations
30 Claims
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1. An image reading apparatus for reading a color document as a monochrome image, comprising:
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a composite light source that irradiates the color document and includes plural light sources different in spectral distribution; a sensor configured to detect an intensity of a reflected light from the color document; a light emission ratio setting unit configured to changeably set light emission ratios different for the respective light sources; and a light source control unit to control effective light amounts of the plural light sources with the set light emission ratios. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An image forming apparatus for reading a color document as a monochrome image and forming the monochrome image, the image forming apparatus comprising:
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a composite light source that irradiates the color document and includes plural light sources different in spectral distribution; a sensor configured to detect an intensity of a reflected light from the color document; a light emission ratio setting unit configured to changeably set light emission ratios different for the respective light sources; a light source control unit configured to control effective light amounts of the plural light sources with the set light emission ratios; and an image forming unit configured to form the monochrome image from an output of the sensor. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. An image forming method for reading a color document as a monochrome image and forming the monochrome image, characterized by comprising:
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a step of irradiating the color document by a composite light source including plural light sources different in spectral distribution; a detection step of detecting an intensity of a reflected light from the color document by a sensor; a light emission ratio setting step of changeably setting light emission ratios different for the respective light sources; a light source control step of controlling effective light amounts of the plural light sources with the set light emission ratios; and an image formation step of forming the monochrome image from an output of the sensor. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification