Adapter circuit for use with auto exposure camera

Claim 2

The combination comprising: controllable electronic flash unit; and light sensitive assembly for use in association with a camera having a shutter mechanism, said light sensitive assembly comprising: first and second output terminals for connection to said controllable electronic flash unit; means responsive to an actuation of the shutter mechanism of the camera for effectively short circuiting said first and second output terminals whereby to initiate an operation of the electronic flash unit; means responsive to the actuation of said flash unit to effectively open circuit said first and second output terminals; light sensitive means responsive to light received from a scene to be photographed to produce an electrical signal representative of the intensity of said light received; integrating means responsive to said electrical signal to produce an integral signal representative of the integral of the light received; means responsive to the actuation of the shutter mechanism to enable operation of said light sensitive means and said integrating means; means responsive to an attainment of a predetermined magnitude of said integral signal for generating a terminate signal; and means responsive to said terminate signal to again effectively short circuit said first and second output terminals whereby to initiate a termination of the operation of said electronic flash unit.

Claim 3

A light sensitive assembly for use in associated with a camera having a shutter mechanism, said light sensitive assembly comprising: first and second output terminals for connection to a controllable electronic flash unit; means responsive to an actuation of the shutter mechanism of the camera for effectively short circuiting said first and second output terminals whereby to initiate actuation of the electronic flash unit; means responsive to the actuation of the flash unit to effectively open circuit said first and second output terminals; light sensitive means responsive to light received from a scene to be photographed to produce an electrical signal representative of the intensity of the light received; integrating means responsive to said electrical signal to produce an integral signal representative of the integral of the light received; means responsive to the actuation of the shutter mechanism to enable operation of said light sensitive means and said integrating means; means responsive to an attainment of a predetermined magnitude of said integral signal for generating a terminate signal, and means responsive to said terminate signal to again effectively short circuit said first and second output terminals whereby to initiate the termination of the operation of the electronic flash unit.

Claim 4

A light sensitive assembly for use in associated with a camera having a shutter mechanism, said light sensitive assembly comprising: first and second output terminals for connection to a controllable electronic flash unit; means responsive to an actuation of the shutter mechanism of the camera for effectively short circuiting said first and second output terminals whereby to initiate actuation of the electronic flash unit; means responsive to the actuation of the flash unit to effectively open circuit said first and second output terminals; light sensitive means responsive to light received from a scene to be photographed to produce an electrical signal representative of the intensity of the light received; integrating means responsive to said electrical signal to produce an integral signal representative of the integral of the light received; means responsive to the actuation of the shutter mechanism to enable operation of said light sensitive means and said integrating means; means responsive to an attainment of a predetermined magnitude of said integral signal for generating a terminate signal, and means responsive to said terminate signal to again effectively short circuit said first and second output terminals whereby to initiate the termination of the operation of the electronic flash unit.

Claim 5

An adapter for interfacing a controllable electronic flash unit with a camera having an electronically controlled shutter assembly wherein the electronically controlled shutter assembly includes light sensitive means responsive to light received from a scene to be photographed to produce an electrical signal representative of the intensity of the light received, integrating means responsive to said electrical signal to produce an integral signal representative of the integral of the light received, a shutter mechanism, means responsive to an actuation of the shutter mechanism to enable an operation of the light sensitive means and the integrating means, and means responsive to an attainment of a predetermined magnitude by said integral signal for generating a terminate signal, said adapter comprising; first and second output terminals for connection to the electronic flash unit; means responsive to the actuation of the shutter mechanism for effectively short circuiting said first and second output terminals whereby to initiate an operation of said electronic flash unit; means responsive to the actuation of the flash unit to effectively open circuit said first and second output terminals; means responsive to said terminate signal to again effectively short circuit said first and second output terminals whereby to initiate a termination of the operation of the electronic flash unit.

Claim 6

An adapter for interfacing a controllable electronic flash unit with a camera having an electronically controlled shutter assembly wherein the electronically controlled shutter assembly includes light sensitive means responsive to light received from a scene to be photographed to produce an electrical signal representative of the intensity of the light received, integrating means responsive to said electrical signal to produce an integral signal representative of the integral of the light received, a shutter mechanism, means responsive to an actuation of the shutter mechanism to enable an operation of the light sensitive means and the integrating means, and means responsive to an attainment of a predetermined magnitude by said integral signal for generating a terminate signal, said adapter comprising; first and second output terminals for connection to the electronic flash unit; means responsive to the actuation of the shutter mechanism for effectively short circuiting said first and second output terminals whereby to initiate an operation of said electronic flash unit; means responsive to the actuation of the flash unit to effectively open circuit said first and second output terminals; means responsive to said terminate signal to again effectively short circuit said first and second output terminals whereby to initiate a termination of the operation of the electronic flash unit.

Claim 7

The adapter as set forth in claim 3 wherein all the power for said adapter is applied through first and second output terminals.

Claim 8

The adapter as set forth in claim 3 wherein said adapter includes: first, second and third input terminals arranged for connection to said camera, said third input terminal being connected to said second output terminal; a programmable unijunction transistor (PUT) having anode, cathode and gate terminals, said PUT anode and cathode terminals being connected across said second and first output terminals, respectively; a coupling means connecting said first input terminal with said PUT gate terminal; diode means having anode and cathode terminals thereof connected between said first output terminal and said second input terminal; and impedance means connected between said PUT gate terminal and said third input terminal.

Claim 9

The adapter as set forth in claim 3 wherein said adapter includes: first, second and third input terminates arranged for connection to said camera, said third input terminal being connected to said second output terminal; a silicon controlled rectifier (SCR) having anode, cathode, and gate terminals, said SCR anode and cathode terminals being connected across said second and first output terminals, respectively; a coupling means connecting said first input terminal with said SCR gate terminal; diode means having anode and cathode terminals thereof connected between said first output terminal and said second input terminal; and impedance means connected between said SCR gate terminal and said third input terminal.

Claim 10

The adapter as set forth in claim 3 wherein said adapter further includes means responsive to the actuation of the flash unit to enable said last mentioned means to effectively short circuit said first and second output signals in response to said terminate signal.