Photographic camera with an electronic shutter speed control

Claim 2

In a camera adapted to expose film to scene light through an exposure aperture, an exposure control apparatus comprising: a. photoresponsive means adapted to receive illumination from an object scene for varying an electrical parameter as a function of the level of scene illumination incident thereon; b. activatable time-delay circuit means including said photoresponsive means for producing a control signal a period of time after activation thereof, said time-delay circuit means including means for establishing the time period as a function of said electrical parameter; c. actuatable shutter means for covering and uncovering the exposure aperture; d. means for actuating said shutter means to uncover said exposure aperture to initiate an exposure interval; e. first means for activating said time-delay circuit means in synchronization with the actuation of said shutter means to initiate an exposure interval; f. means for actuating said shutter means to cover said exposure aperture in response to said control signal; g. an electrical indicator coupled to said time-delay circuit means and actuatable to indicate the end of an exposure interval in response to said control signal; and h. second means for activating said time-delay circuit means independently of the actuation of said shutter means to enable actuation of said electrical indicator without effecting an exposure.

Claim 3

In a camera adapted to expose film to scene light through an exposure aperture, an exposure control apparatus comprising: a. photoresponsive means adapted to receive illumination from an object scene for varying an electrical parameter as a function of the level of scene illumination incident thereon; b. activatable time-delay circuit means including said photoresponsive means for producing a control signal a period of time after activation thereof, said time-delay circuit means including means for establishing the time period as a function of said electrical parameter; c. actuatable shutter means for covering and uncovering the exposure aperture; d. means for actuating said shutter means to uncover said exposure aperture to initiate an exposure interval; e. first means for activating said time-delay circuit means in synchronization with the actuation of said shutter means to initiate an exposure interval; f. means for actuating said shutter means to cover said exposure aperture in response to said control signal; g. an electrical indicator coupled to said time-delay circuit means and actuatable to indicate the end of an exposure interval in response to said control signal; and h. second switch means manually actuatable to activate said time-delay circuit means independently of the actuation of said shutter means to enable actuation of said electrical indicator without effecting an exposure.

Claim 4

In a camera adapted to expose film to scene light through an exposure aperture, an exposure control apparatus comprising: a. photoresponsive means adapted to receive illumination from an object scene for varying an electrical parameter as a function of the level of scene illumination incident thereon; b. activatable time-delay circuit means including said photoresponsive means for producing a control signal a period of time after activation thereof, said time-delay circuit means including means for establishing the time period as a function of said electrical parameter; c. actuatable shutter means for covering and uncovering the exposure aperture; d. means for actuating said shutter means to uncover said exposure aperture to initiate an exposure interval; e. first means for activating said time-delay circuit means in synchronization with the actuation of said shutter means to initiate an exposure interval; f. means for actuating said shutter means to cover said exposure aperture in response to said control signal; g. an electrical indicator coupled to said time-delay circuit means and actuatable to indicate the end of an exposure interval in response to said control signal; and h. second switch means manually actuatable to activate said time-delay circuit means independently of the actuation of said shutter means to enable actuation of said electrical indicator without effecting an exposure.

Claim 5

In a camera adapted to expose film to scene light through an exposure aperture, an exposure control apparatus comprising: a. photoresponsive means adapted to receive illumination from an object scene for varying an electrical parameter as a function of the level of scene illumination incident thereon; b. activatable, integrating circuit means including said photoresponsive means for producing an output voltage that varies when activated from a first predetermined level to a second predetermined level over a period of time that is a function of the level of illumination incident on said photoresponsive means; c. a voltage-sensing trigger circuit coupled to said output of said integrating circuit means, said trigger circuit being adapted to switch from a first state to a second state when said output voltage reaches said second predetermined level; d. actuatable shutter means for covering and uncovering the exposure aperture; e. means for actuating said shutter mechanism to uncover said exposure aperture to initiate an exposure interval; f. first switch means for activating said integrating circuit means in response to actuation of said shutter means to initiate an exposure interval; g. transducer means coupled to said trigger circuit means in response to actuation of said shutter means to initiate an exposure interval; g. transducer means coupled to said trigger circuit for actuating said shutter means to cover said exposure aperture in response to switching of said trigger circuit to its second state; h. an electrical indicator coupled to said trigger circuit and actuatable to indicate the switching of said trigger circuit to its second state; and i. second switch means manually actuatable to activate said integrating circuit means independently of the actuation of said shutter means to enable actuation of said electrical indicator without effecting an exposure.

Claim 6

In a camera adapted to expose film to scene light through an exposure aperture, an exposure control apparatus comprising: a. photoresponsive means adapted to receive illumination from an object scene for varying an electrical parameter as a function of the level of scene illumination incident thereon; b. activatable, integrating circuit means including said photoresponsive means for producing an output voltage that varies when activated from a first predetermined level to a second predetermined level over a period of time that is a function of the level of illumination incident on said photoresponsive means; c. a voltage-sensing trigger circuit coupled to said output of said integrating circuit means, said trigger circuit being adapted to switch from a first state to a second state when said output voltage reaches said second predetermined level; d. actuatable shutter means for covering and uncovering the exposure aperture; e. means for actuating said shutter mechanism to uncover said exposure aperture to initiate an exposure interval; f. first switch means for activating said integrating circuit means in response to actuation of said shutter means to initiate an exposure interval; g. transducer means coupled to said trigger circuit means in response to actuation of said shutter means to initiate an exposure interval; g. transducer means coupled to said trigger circuit for actuating said shutter means to cover said exposure aperture in response to switching of said trigger circuit to its second state; h. an electrical indicator coupled to said trigger circuit and actuatable to indicate the switching of said trigger circuit to its second state; and i. second switch means manually actuatable to activate said integrating circuit means independently of the actuation of said shutter means to enable actuation of said electrical indicator without effecting an exposure.