[ale] OT: camcorder/camera combos

[James P. Kinney III]

Jeff, 

I think it's the other way around. The signal produced by the pixel
charge the capacitors.

Ascii art time :)


       |   |   CCD pixel 
       | . | <- electron(s) available for exitation by photons 
(-)----|   |    |
  |    |___|    |
  |             |  Capacitor "cup" collects electrons
  |             |  that "spill out" of the pixel
  | . .. . ... .|
  | ............|     ____
  |_____________|----- \\\
                  ^     
                  |__ read current here during read cycle

On Wed, 2002-12-11 at 21:40, Jeff Hubbs wrote:
> On Wed, 2002-12-11 at 03:29, Eric Webb wrote:
> 
> > (Does anyone know if all CCDs are essentially analog in nature, or are there 
> > some that are truly digital?)
> 
> If by "truly digital" you mean that photons get translated into a binary
> word where they land, then, no. :)
> 
> I'm working from memory from long ago here, but IIRC, CCD imagers charge
> up what is in effect a grid of capacitors, then photons come around and
> bonk some of the electrons away from eachone.  It then becomes a matter
> of reading off the remaining potential, and the amount of potential lost
> is proportional to the amount of photon impingement.  It's kind of a
> solid-state re-implementation of the Orthicon tube.
> 
> - Jeff
> 
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GPG ID: 829C6CA7 James P. Kinney III (M.S. Physics) <jkinney at localnetsolutions.com>
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