Image sensor and image sensor chips therefor including dummy pho

Details Image sensor and image sensor chips therefor including dummy pho Image sensor and image sensor chips therefor including dummy pho

1992-04-15

1993-12-07

Mancuso, Joseph

Facsimile and static presentation processing

Facsimile

Recording apparatus

35821311, 2502081, H04N 314, H04N 5335

Patent

active

052687651

ABSTRACT:
An image sensor and image sensor chip therefor which generates a reference level for the dark output during the blanking period of the sensor and which provides internal switching for removing residual charge from a waveform shaping capacitor. In one embodiment, image sensor chips are arranged in a line and cascaded to form an image sensor and a dummy photocell is provided which is configured similarly to the image sensor photocells and which has its windows shielded from light. A dummy select switch selectively makes connections with a signal line to which the signals from the image sensor photocells are outputted. The dummy select switch remains closed after completion of the drive period of the photocells at the last image sensor chip and the output of the dummy photocell is used as the reference level for the dark output during the blanking period. In another aspect of the invention, a switch is provided within the chip to remove residual charge from the waveform shaping capacitor.

REFERENCES:
patent: 4484223 (1984-11-01), Tsurekawa
patent: 5043719 (1991-08-01), Nakagawa et al.
patent: 5070236 (1991-12-01), Miyake
patent: 5109440 (1992-04-01), Kawahara et al.
Mitsubishi Catalogue, pp. 1-17, Sep. 1991.

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