Method of transferring electric charge from image sensing device and image sensing device
An image sensing device for transferring electric charge from a plurality of photoelectric converters disposed therein. The image sensing device is divided into a plurality of pixel areas. At least a pair of the divided pixel areas contiguous to each other have a vertical transfer CCD, an oblique shift CCD and a horizontal transfer CCD to transfer the electric charge from the photoelectric converters to an output stage. The output stage is at least disposed contiguous to the boundary of the divided pixel areas adjacent to each other.
1. An image sensing device for transferring electric charge to convert a light image into an electric signal by a plurality of photoelectric converters disposed in a CCD, the image sensing device comprising:
a plurality of pixel areas divided in the CCD for transferring an electric charge from the photoelectric converters;
a plurality of vertical transfer CCDs for transferring the electric charge from the plurality of photoelectric converters in a vertical direction;
a plurality of oblique shift CCDs for transferring the electric charge from the vertical transfer CCD to shift the electric charge in an oblique direction;
first and a second horizontal transfer CCDs for transferring the electric charge respectively, the electric charge being transferred from the oblique shift CCD in the horizontal direction to output an electric signal; and
first and a second output stages for outputting the electric signal respectively, the electric signal being transferred from the first and the second horizontal transfer CCD in each divided pixel area, the first and the second output stage being at least disposed respectively contiguous to the boundary of the pixel areas adjacent one another in the CCD,
first and a second electric charge injectors for supplying respectively a reference signal of a predetermined level to the output of the first or second horizontal transfer CCD, the first and second electric charge injectors being arranged respectively between the first output stage and the second output stage.
2. The image sensing device as claimed in claim 1 further comprising:
an amplifier for amplifying the electric signal added with the reference signal supplied from the electric charge injector;
a level adjust means for adjusting the signal level of the reference signal supplied from each divided pixel area equally; and
an adder for adding the output of the level adjust means to produce a signal for one scanning line.
3. The image sensing device as claimed in claim 2 , wherein the amplifier adjusts a gain of the reference signal by a fixed amount and adjusts a gain of a signal portion other than the reference signal by a variable amount in accordance with the signal level.