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US 5,317,406 AGranted
Image reading device and image information processing apparatus utilizing the same
AssigneeCanon Kabushiki Kaisha
InventorsIsao Kobayashi, Noriyuki Kaifu, Toshihiro Saika, Tadao Endo
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Abstract
An image reading device includes a plurality of photoelectric converting elements, a plurality of accumulating elements corresponding to each of the photoelectric converting elements, and switching circuitry for reading out the signals accumulated in the accumulating elements. Each of the photoelectric converting elements comprises a switching portion and a sensor portion. Driving circuitry is provided for driving the photoelectric converting elements by activating the switching portions to release the charges accumulated in the accumulating elements through the photoelectric converting elements in order to reset the accumulated elements.
Claims31
An image reading device comprising:
- a plurality of first accumulating means;
- a plurality of phototransistors each having a first main electrode, a second main electrode, and a control electrode, first main electrodes of said plurality of phototransistors being connected in common and being selectively connectable to a reference voltage source, second main electrodes of said plurality of phototransistors being connected to said plurality of first accumulating means;
- switch means;
- a plurality of second accumulating means connected respectively to said plurality of first accumulating means through said switch means;
- readout means for reading, in serial, signals accumulated in said plurality of second accumulating means;
- and
- reset means connected to the control electrodes of said phototransistors to drive said phototransistors thereby resetting the signals accumulated in said first accumulating means through said phototransistors.
4 more elements
An image reading device comprising:
- a plurality of first accumulating means;
- a plurality of phototransistors each having a first main electrode, a second main electrode, and a control electrode, first main electrodes of said plurality of phototransistors being selectively connectable in serial to a reference voltage source, second main electrodes of said plurality of phototransistors being connected to said plurality of first accumulating means;
- switch means;
- a plurality of second accumulating means connected respectively to said plurality of first accumulating means through said switch means;
- readout means for reading out signals accumulated in said plurality of second accumulating means;
- and
- reset means connected to the control electrodes of said phototransistors and adapted to drive said phototransistors thereby resetting the signals accumulated in said first accumulating means through said phototransistors.
4 more elements
An image reading device comprising:
- a plurality of photoelectric converting elements;
- a plurality of accumulating elements provided respectively corresponding to said plurality of photoelectric converting elements and adapted to accumulate output signals thereof;
- switch means for reading out the signals accumulated in said accumulating elements as optical information;
- each said photoelectric converting element comprising a switch portion and a sensor portion;
- and
- means for driving said photoelectric converting elements by activating the switching portions to release the accumulated charges from said accumulating elements through said photoelectric converting elements in order to reset said accumulating elements;
- wherein said driving means includes a shift register, and wherein each of said switching portions comprises a field effect transistor a gate electrode of which is connected to said shift register;
- and
- wherein said gate electrode is connected to either of the source and drain electrodes of said field effect transistor.
6 more elements
An image information processing device comprising:
- a plurality of photoelectric converting elements;
- a plurality of accumulating elements provided respectively corresponding to said plurality of photoelectric converting elements and adapted to accumulate output signals thereof;
- switch means for reading out the signals accumulated in said accumulating elements as optical information;
- each said photoelectric converting element comprising a switching portion and a sensor portion;
- and
- means for driving said photoelectric converting elements by activating the switching portions to release the accumulated charges from said accumulating elements through said photoelectric converting elements in order to rest said accumulating elements;
- wherein said driving means includes a shift register, and wherein each of said switching portions comprises a field effect transistor a gate electrode of which is connected to said shift register;
- and
- wherein said gate electrode is connected to either of the source and drain electrodes of said field effect transistor.
6 more elements
An image information processing device comprising:
- a plurality of first accumulating means;
- a plurality of phototransistors each having a first main electrode, a second main electrode, and a control electrode, first main electrodes of said plurality of phototransistors being connected in common and being selectively connectable to a reference voltage source, and second main electrodes of said plurality of phototransistors being connected to said plurality of first accumulating means;
- switch means;
- a plurality of second accumulating means connected respectively to said plurality of first accumulating means through said switch means;
- readout means for reading, in serial, signals accumulated in said plurality of second accumulating means;
- and
- reset means connected to the control electrodes of said phototransistors to drive said phototransistors thereby resetting the signals accumulated in said first accumulating means through said plurality of phototransistors.
4 more elements
An image information processing device comprising:
- a plurality of first accumulating means;
- a plurality of phototransistors each having a first main electrode, a second main electrode, and a control electrode, first main electrodes of said plurality of phototransistors being selectively connectable in serial to a reference voltage source, second main electrodes of said plurality of phototransistors being connected to said plurality of first accumulating means;
- switch means;
- a plurality of second accumulating means connected respectively to said plurality of first accumulating means through said switch means;
- readout means for reading out signals accumulated in said plurality of second accumulating means;
- and
- reset means connected to the control electrodes of said phototransistors and adapted to drive said phototransistors thereby resetting the signals accumulated in said first accumulating means through said phototransistors.
4 more elements
An image reading device comprising:
- a plurality of accumulating means;
- a plurality of phototransistors each having a first main electrode, a second main electrode, and a control electrode, first main electrodes of said plurality of phototransistors being selectively connectable to a reference voltage source, second main electrodes of said plurality of phototransistors being connected to said plurality of accumulating means;
- readout means for reading out signals accumulated in said plurality of accumulating means;
- and
- reset means connected to said control electrodes of said phototransistors to drive said phototransistors thereby resetting the signals accumulated in said accumulating means through said phototransistors.
2 more elements
An image information processing device:
- a plurality of accumulating means;
- a plurality of phototransistors each having a first main electrode, a second main electrode, and a control electrode, first main electrodes of said plurality of phototransistors being selectively connectable to a reference voltage source, second main electrodes of said plurality of phototransistors being connected to said plurality of accumulating means;
- readout means for reading out signals accumulated in said plurality of accumulating means;
- and
- reset means connected to said control electrodes of said phototransistors to drive said phototransistors thereby resetting the signals accumulated in said accumulating means through said phototransistors.
2 more elements
Dependencies are inferred from the claim text.