Originally posted by WerTicus You cant prevent a light sensitive device from generating electricity unless you block out the light. Without a mechanical shutter the sensor would be generating a signal constantly....
Not really.
We can prevent a light sensitive device from generating electricity when the power supplied to it is cut !
As such, switching on and off the power supply to the imager can do the electronic shutter, but of course there are side effects and limitations, too.
Quote: Could use that to charge the battery maybe
Ricoh had a SLR called XR-S which used solar energy to power the light meter. But since the solar generates only weak power, it can by no means drive a power hungry monster like a DSLR. XR-S is a mechanical SLR, IIRC, there is even no electronic controlled shutter.