Yashica ELECTRO 35 Instruction Booklet page 58

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What is an Electronic Shutter?
In the conventional Cameras. the amount
of light accepted by the CdS photoresistor
cell is converted into the electric current.
The CdS meter needle is interconnected
with the shutter speeds and the aper·
tures to obtain the correct exposure.
In this Electro 35 with the electronic shut·
ter the amount of light accepted by the
CdS photoresistor cell is controlled for
perfect exposure by means of a com-
pletely transistorized electric circuit, con·
denser and an electric magnet to actuate
the shutter
Principle of Electronic Shutter
When the shutter release button is depressed. the shutter
blades are fully opened and at the same time, the power
supply switch is automatically turned to "ON" The
amount of light entering the CdS photoresistor cell
actuates charging in the condenser when it is fully
charged to the prescribed voltage , the transistorized
circuit activates the electric magnet to trip the shutter
blades to close .