Memory locking means of an exposure control circuit for a camera

A memory locking means of an exposure control circuit for a camera including a light measuring circuit for constantly supplying a changing voltage output indicative of changing scene brightness, a memory circuit connected therewith for memorizing the voltage output of the light measuring circuit, and normally closed first switching means connected in series between the light measuring circuit and memory circuit which is opened in response to shutter release operation for locking and memorized voltage in the memory circuit, electronic switching means connected in series with the first switching means between the light measuring circuit and the memory circuit for locking the memorized voltage in the memory circuit independently of the first switching means, a time constant circuit connected between a power source and said electronic switching means, and normally open manually operable second switching means connected between said time constant circuit and said power source, said time constant circuit being adapted to turn on said electronic switching means when the manually operable second switching means is turned on and turn off said electronic switching means when a time period determined by the time constant circuit has lapsed since the manually operable second switching means was turned on.