Control of shutter closing for excessive object brightness

A camera exposure control system comprising:

• light measuring means for generating an output as a function of the brightness of an object to be photographed;
• first delay means for providing a first delay time signal commensurate with said output;
• means for providing a reference voltage;
• comparator means for comparing said output with said reference voltage and generating a control signal with said output exceeding said reference voltage;
• first means for actuating said first delay means in response to shutter opening;
• electromagnetic means for initiating shutter closure;
• second means for actuating said electromagnetic means in response to said first delay time signal;
• second delay means for causing an additional delay between the shutter opening and the shutter closing;
• and
• delay control means for actuating said second delay means in response to said control signal.

A camera exposure control system comprising:

• a light measuring circuit for generating an output as a function of the brightness of an object to be photographed;
• a shutter control circuit for controlling shutter speed in accordance with said output, said shutter control circuit includes storage means for storing said output, an integrating capacitor, semiconductor means for charging said integrating capacitor with a current commensurate with said stored output, an electromagnet for initiating shutter closure, and a switching circuit for actuating said electromagnet when said integrating capacitor is charged to a predetermined level;
• a delay circuit for slowing the shutter speed controlled by said shutter control circuit;
• an out-of-range detecting circuit for generating a signal when said output exceeds a predetermined level;
• and
• a delay control circuit for actuating said delay circuit in response to the signal from said detecting circuit.

A camera exposure control system comprising:

• a light measuring circuit for generating an output as a function of the brightness of an object to be photographed;
• a shutter control circuit for controlling shutter speed in accordance with said output, said shutter control circuit includes a timer circuit actuated in response to shutter opening to generate a timing signal after a lapse of a time interval commensurate with said output, an electromagnet actuatable for initiating shutter closure and a switching circuit for actuating said electromagnet in response to said timing signal;
• a delay circuit for slowing the shutter speed controlled by said shutter control circuit and interposed between said switching circuit and said electromagnet for delaying the actuation of said elctromagnet by said timing signal;
• an out-of-range detecting circuit for generating a signal when said output exceeds a predetermined level;
• and
• a delay control circuit for actuating said delay circuit in response to the signal from said detecting circuit.

A camera exposure control system comprising:

• a light measuring circuit for generating an output as a function of the brightness of an object to be photographed;
• a shutter control circuit for controlling shutter speed in accordance with said output, said shutter control circuit includes a timer circuit actuated in response to shutter opening to generate a timing signal after a lapse of a time interval commensurate with said output, an electromagnet actuatable for initiating shutter closure and a switching circuit for actuating said electromagnet in response to said timing signal;
• a delay circuit for slowing the shutter speed controlled by said shutter control circuit, said delay circuit is coupled with said electromagnet to delay the actuation of said electromagnet for a time, after the generation of said timing signal;
• an out-of-range detecting circuit for generating a signal when said output exceeds a predetermined level;
• and
• a delay control circuit for actuating said delay circuit in response to the signal from said detecting circuit.

A camera exposure control system comprising:

• a light measuring circuit for generating an output as a function of the brightness of an object to be photographed;
• a shutter control circuit for controlling shutter speed in accordance with said output, said shutter control circuit includes a timer circuit actuated in response to shutter opening to generate a timing signal after a lapse of a time interval commensurate with said output, an electromagnet actuatable for initiating shutter closure and a switching circuit for actuating said electromagnet in response to said timing signal;
• a delay circuit for slowing the shutter speed controlled by said shutter control circuit;
• an out-of-range detecting circuit for generating a signal when said output exceeds a predetermined level;
• a delay control circuit for actuating said delay circuit in response to the signal from said detecting circuit;
• and
• a flash control circuit for interrupting flash firing in response to said timing signal.