Image inputting apparatus and image forming apparatus using four-line CCD sensor
AssigneesKabushiki Kaisha Toshiba, Toshiba Tec Kabushiki Kaisha
InventorsJun Sakakibara, Koji Tanimoto
Life of this patent
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Abstract
A four-line CCD sensor is structured by line sensors R, G, B in which color filters are respectively disposed on surfaces of light receiving elements, and a line sensor BK at which no color filter is disposed. Amplitudes of signals which are outputted from the line sensors R, G, B at a time of reading a color document, and an amplitude of a signal which is outputted from the line sensor BK at a time of reading a monochrome document are adjusted so as to be substantially equal to one another. In a case in which a color document is read, outputs of the line sensors R, G, B are selectively provided, and in a case in which a monochrome document is read, output of the line sensor BK is selectively provided.
Claims20
An image inputting apparatus which reads a document optically and provides image information which corresponds to a document image, the image inputting apparatus comprising:
- a light source which irradiates light onto the document;
- a four-line CCD sensor which includes a first CCD line sensor which is structured by a three-line CCD sensor in which color filters are respectively disposed on surfaces of light receiving elements, and a second CCD line sensor which is structured by a one-line CCD sensor in which no color filter is disposed, the four-line CCD sensor receiving reflected light from the document and providing an image signal which corresponds to the reflected light;
- a driving section which supplies a signal including an image transfer clock to the four-line CCD sensor, and drives the four-line CCD sensor;
- adjusting section which adjusts an amplitude of at least one signal among signals outputted from the first CCD line sensor when a color document is read and an amplitude of a signal which is outputted from the second CCD line sensor when a monochrome document is read, to be substantially equal to one another;
- and
- a selecting section which selectively provides output of the first CCD line sensor in a case in which a color document is read, and selectively provides output of the second CCD line sensor in a case in which a monochrome document is read.
An image forming apparatus which reads a document optically and forms an image which corresponds to a document image, the image forming apparatus comprising:
- a light source which irradiates light onto the document;
- a four-line CCD sensor which includes a first CCD line sensor which is structured by a three-line CCD sensor in which color filters are respectively disposed on surfaces of light receiving elements, and a second CCD line sensor which is structured by a one-line CCD sensor in which no color filter is disposed, the four-line CCD sensor receiving reflected light from the document and providing an image signal which corresponds to the reflected light;
- a driving section which supplies a signal including an image transfer clock to the four-line CCD sensor, and drives the four-line CCD sensor;
- adjusting section for adjusting an amplitude of at least one signal among signals which are outputted from the first CCD line sensor at a time of reading a color document, and an amplitude of a signal which is outputted from the second CCD line sensor at a time of reading a monochrome document, to be substantially equal to one another;
- a selecting section which selectively provides output of the first CCD line sensor in a case in which a color document is read, and selectively provides output of the second CCD line sensor in a case in which a monochrome document is read;
- and
- an image forming section which forms an image on a medium on which an image is to be formed, on the basis of image signals which are selectively provided from the selecting section.
An image inputting method which reads a document optically and provides image data which corresponds to a document image, the image inputting method comprising the steps of:
- irradiating light onto the document;
- supplying a signal including an image transfer clock to a four-line CCD sensor, and driving the four-line CCD sensor, wherein the four-line CCD sensor includes a first CCD line sensor which is structured by a three-line CCD sensor in which color filters are respectively disposed on surfaces of light receiving elements and a second CCD line sensor which is structured by a one-line CCD sensor in which no color filter is disposed, and receiving reflected light from the document, and providing an image signal which corresponds to the reflected light;
- adjusting an amplitude of at least one signal among signals which are outputted from the first CCD line sensor at a time of reading a color document and an amplitude of a signal which is outputted from the second CCD line sensor at a time of reading a monochrome document, to be substantially equal to one another;
- and
- selectively providing output of the first CCD line sensor in a case in which a color document is read, and selectively providing output of the second CCD line sensor in a case in which a monochrome document is read.
Dependencies are inferred from the claim text.