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AssigneeCanon Kabushiki Kaisha
InventorsMITSURU KURITA, HIROSHI SATO, KOJI ARAI, KOICHI ISHIMOTO, TARO IKEDA, TAKASHI SUGIURA
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To control a light emitted from a fluorescent lamp having phosphors with different afterglow properties for different colors, a center of a lighting control signal for controlling the lighting of the fluorescent lamp is controlled to constantly align with the center of a Hsync period so that despite the variation of the lighting time of the fluorescent lamp, a barycenter of the quantity of light from the fluorescent lamp in the Hsync period almost aligns with the center of the Hsync period to reduce the offset of the barycenter.
An image reading apparatus for forming an image of an original on a plurality of line sensors via an image-forming optical system to read the image, comprising:
An image reading apparatus for forming an image of an original on a plurality of line sensors via an image-forming optical system to read the image, comprising:
A method for controlling an image reading apparatus comprising a white light source for irradiating an original with light, said light source having different afterglow properties for different colors corresponding to a plurality of read colors of a plurality of line sensors, said image reading apparatus forming an image of the original irradiated in said white light source on the plurality of line sensors via an image-forming optical system to read the image, said method comprising:
A method for controlling an image reading apparatus having a white light source for irradiating an original with light, said light source having different afterglow properties for different colors corresponding to a plurality of read colors of a plurality of line sensors, said image reading apparatus forming an image of the original irradiated in said white light source on the plurality of line sensors via an image-forming optical system to read the image, said method comprising:
Dependencies are inferred from the claim text.
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Using the same detector device sequentially for different colour components: with sequential colour illumination of the original
Picture signal circuits: circuits for driving or energising particular reading heads or original illumination means
Pictorial communication
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The present invention relates to an image reading apparatus and method for forming an image of an original on solid-state image sensing devices via an image-forming optical system to read the image.
Various image reading apparatuses that form an image of an original on a plurality of line sensors (solid-state image sensing devices such as CCDS) via an image-forming optical system and that digitally read a black-and-white or colored image based on output signals from the line sensors have been proposed.
FIG. 21 is a schematic view of the integral part of an optical system in a conventional colored-image reading apparatus as seen from a lateral side.
The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention, and together with the description, serve to explain the principles of the invention.
FIGS. 1A to 1D are graphs describing operations according to embodiments of the present invention;
FIG. 2 is a perspective view of a light source including a fluorescent lamp;
Preferred embodiments of the present invention will be described in detail in accordance with the accompanying drawings.
The embodiments of the present invention will be described below in detail by exemplifying an image reading apparatus. Although the embodiments will be described in conjunction with the reading of a manuscript by illuminating it and receiving light reflected by the original, this invention is not limited to this aspect and can be similarly implemented by reading a transparent manuscript such as a film.
(First Embodiment)