Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1981-06-03
1984-11-20
Chin, Tommy P.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358221, H04N 315
Patent
active
044842236
ABSTRACT:
An image sensor causes a solid-state imaging device, at the scanning of an image, to release in succession a dark current signal generated in the solid-state imaging device and a scanning signal containing said dark current signal, subtracts said dark current signal from said scanning signal by a differential circuit to obtain an image signal corresponding to said image, and so regulates by means of an integrating time control circuit and in response to the level of said image signal, the image signal integrating time of said solid-state imaging device as that said image signal remains within a certain level range. In an improvement of the present invention there is further provided means for forcedly resetting the image signal integrating time to be determined by said integrating time control circuit to a shorter time in case the image signal reaches an inappropriate level while said image signal integrating time is fixed at a determined level without renewed control thereof.
REFERENCES:
patent: 4004852 (1977-01-01), Pentecost
patent: 4178098 (1979-12-01), Asano et al.
patent: 4189232 (1980-02-01), Asano et al.
patent: 4293877 (1981-10-01), Tsunekawa
patent: 4305657 (1981-12-01), Masunaga et al.
patent: 4329033 (1982-05-01), Masunaga et al.
patent: 4335405 (1982-06-01), Sakane
patent: 4368978 (1983-01-01), Tsunekawa et al.
Canon Kabushiki Kaisha
Chin Tommy P.
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