Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1986-08-15
1988-03-29
Ng, Jin F.
Facsimile and static presentation processing
Facsimile
Recording apparatus
35821319, 358211, H04N 314
Patent
active
047347767
ABSTRACT:
The invention relates to a charge injection device for optical sensing including a novel readout circuit facilitating an extended dynamic range. The invention has primary application to linear arrays for IR sensing.
Sensitive, low-level operation is achieved in a primary readout means by allowing the charge to accumulate in the potential well of the individual sensor elements over the line period with each element being reset at the pixel readout rate and by using a charge injection pulse to clear stored charge from the individual sensor elements. A secondary readout means is also provided in which the charge is allowed to accumulate over a period not exceeding the pixel readout interval for unsaturated large signal operation and by sensing the change in depth of the potential well. The two readout means are combined in the eventual display to provide an improvement of typically three orders of magnitude in the dynamic range of the CID.
REFERENCES:
patent: 4316221 (1982-02-01), Swab
patent: 4407010 (1983-09-01), Baji et al.
patent: 4682236 (1987-07-01), Wang et al.
Ludington David N.
Wang Samuel C.
Baker Carl W.
Brinich Stephen
General Electric Company
Jacob Fred
Lang Richard V.
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