Shuttered CCD camera with low noise

Details Shuttered CCD camera with low noise Shuttered CCD camera with low noise

1984-03-23

1986-01-21

Masinick, Michael A.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 41, 358 43, 358 55, 358209, 358225, 358229, H04N 909, H04N 904, H04N 907, H04N 5225

Patent

active

045660298

ABSTRACT:
A television camera having solid-state imagers has a motor-driven shutter disc for reducing highlight smear during the pull-down transfer interval. The shutter disc diameter is reduced to minimize stored energy and synchronization time. Because of the small shutter diameter, the drive motor is near the imagers. Low-level noise at the shutter rotational rate is coupled to the imagers, and is rendered visible because it is coherent with the field rate. The noise is reduced by means of an ungrounded conductive shield surrounding the motor. Noise is reduced by placing imager contributing the greatest luminance component furthest from the motor.

REFERENCES:
patent: 3600504 (1971-08-01), Reilly
patent: 3603722 (1971-09-01), Graham
patent: 4125857 (1978-11-01), Sarson et al.
patent: 4200934 (1980-04-01), Hofmann
patent: 4471388 (1984-09-01), Dischert

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