Posted: Sun Apr 23, 2006 8:34 pm Post subject: CCD
CCD-Charged Coupled Device
A charged coupled device (CCD) converts light into proportional (analog) electrical current. The two main types of CCDs are linear arrays used in flatbed scanners, digital copiers, and graphic arts scanners, and area arrays used in camcorders, still-video cameras, digital cameras, and fast scanners.
CCD consists of several hundred thousand individual picture elements (pixels) on a tiny 1/2", 1/3", or 1/4" chip. Each pixel responds to light falling on it by storing a tiny charge of electricity. The pixels are arranged on a precise grid, with vertical and horizontal transfer registers carrying the signals to the camera's video processing circuitry. This transfer of signals occurs sixty times per second.
The 1/3" CCD chip is the most widely used sensor format these days; its size is 5.5mm (diagonal), 4.4mm (horizontal) and 3.3mm (vertical). The 1/4" sensor format, recently being used in color cameras, is 4mm (diagonal), 3.2mm (horizontal) and 2.4mm (vertical).
The CCD chip's Electronic Shutter plays a major role in making a fantastic and reliable picture.
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