Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1983-05-16
1987-01-20
Rubinson, Gene Z.
Facsimile and static presentation processing
Facsimile
Recording apparatus
H04N 314
Patent
active
046383611
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to solid state image pickup apparatus employing a solid state image pickup device which comprises a charge transfer device, and more particularly, is directed to an improved solid state image pickup apparatus employing a solid state image pickup device of the interline transfer type, in which the driving condition for charge transfer performed in the solid state image pickup device is contrived so that a certain defect on a reproduced picture obtained in response to an image pickup signal output derived therefrom is eliminated.
TECHNICAL BACKGROUND
Solid state image pickup devices comprising a charge transfer device such as a charge coupled device ( hereinafter referred to as a CCD ) are classified broadly into the frame transfer type and the interline transfer type, and each of them is utilized in different way so as to make a good use of its advantages and features. One example of the solid state image pickup device of the interline transfer type using the CCD comprises a photo-sensing and vertical transfer portion which includes a plurality of photodetectors arranged in horizontal and vertical rows and vertical transfer portions each formed with a group of CCDs and extending along each of the vertical rows of the photodetectors, a horizontal transfer portion coupled with the photo-sensing and vertical transfer portion and an output portion coupled with the horizontal transfer portion and provided with an signal output terminal, the whole of which are formed on a common semiconductor substrate.
In a solid state image pickup apparatus employing such a solid state image pickup device of the interline transfer type using the CCD, a vertical driving signal for vertical charge transfer is applied to the vertical transfer portions through vertical transfer electrodes which are provided on an insulating layer overspreading the photosensing and vertical transfer portion and a horizontal driving signal for horizontal charge transfer is applied to the horizontal transfer portion through horizontal transfer electrodes which are provided on an insulating layer overspreading the horizontal transfer portion, so that vertical charge transfer operation and horizontal charge transfer operation are performed in the vertical transfer portions and the horizontal transfer portion, respectively. For example, signal charges obtained in the photodetectors in response to the light received thereby during one frame period are read out to the vertical transfer portions, and then transferred toward the horizontal transfer portion by the vertical charge transfer operation performed in the vertical transfer portion so that the signal charges produced in each horizontal row of the photodetectors are transferred in turn to the horizontal transfer portion. The signal charges transferred to the horizontal transfer portion are further transferred to the output portion by the horizontal charge transfer operation performed in the horizontal transfer portion and as a result of this an image pickup signal output is obtained at the signal output terminal.
When a picture is reproduced in response to an image pickup signal output obtained under such operation of the solid state image pickup device of the interline transfer type as described above in a previousely proposed solid state image pickup apparutus, it is often seen that such a defect as to appear to be a pair of black and white spots contiguous up and down to each other arises on the reproduced picture. This defect is usually called "white and black spots", and the black spot therein tends to elongate when the image pickup signal output is produced under relatively low illuminance. Such white and black spots can not be eliminated by means of ordinary defect correction, because they result from a local area of deep ( high ) potential residing in the vertical transfer portion. This local area of deep potential in the vertical transfer portion appears at a region having high impurity density which is provided undesirably due to nonuniformity in im
REFERENCES:
patent: 4117514 (1978-09-01), Terui et al.
patent: 4455575 (1984-06-01), Murakoshi
patent: 4462047 (1984-07-01), Fujimoto et al.
patent: 4500924 (1985-02-01), Ohta
Brinich Stephen
Rubinson Gene Z.
Sony Corporation
LandOfFree
Solid state image pickup does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Solid state image pickup, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Solid state image pickup will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2138045