Correct exposure annunciator circuit

Claim 2

An annunciator circuit for use with a photographic circuit, said photographic circuit including a first signal generating means for generating a first control signal, a second signal generating means for generating a second control signal, a light producing means responsive to said first control signal for initiating the operation of said light producing means whereby light is emitted therefrom, and a light quenching means responsive to said second control signal for initiating the operation of said light quenching means whereby said emitted light is effectively terminated, said annunciator circuit comprising: a signal responsive annunciator indicator, a control member serially connected in an energization circuit with said annunciator indicator, said control member being responsive to said second control signal to effect a closure of said energization circuit, thereby activating said annunciator indicator, and selectively operable means for subsequently interrupting said energization circuit.

Claim 3

The invention as set forth in claim 1 wherein said control member is a light activated silicon controlled rectifier (LASCR), having its anode-cathode path serially connected in said annunciator circuit, said LASCR being arranged in proximity ti said light quenching means whereby to render said LASCR conductive in response to light given off during an operation of said light quenching means.

Claim 4

The invention as set forth in claim 1 wherein said control member comprises a silicon controlled rectifier (SCR) having its anode-cathode path serially connected in said annunciaTor circuit and means for connecting the gate electrode thereof to said second signal generating means whereby to render said SCR conductive in response to said second control signal.

Claim 5

The invention as set forth in claim 3 wherein said annunciator indicator is a lamp member.

Claim 6

The invention as set forth in claim 3 wherein said selectively operable means is a manually operated switch means serially connected in said energization circuit, a momentary selective operation of which interrupts said energization circuit, rendering said SCR nonconductive.

Claim 7

The invention as set forth in claim 3 wherein said selectively operable means comprises means for connecting said first signal generating means to the anode of said SCR whereby to render said SCR nonconductive in response to said first control signal.

Claim 8

The invention as set forth in claim 2 wherein said annunciator indicator is a lamp member.

Claim 9

The invention as set forth in claim 2 wherein said selectively operable means is a manually operated switch means serially connected in said energization circuit, a momentary selective operation of which interrupts said energization circuit, rendering said SCR nonconductive.

Claim 10

The invention as set forth in claim 2 wherein said selectively operable means comprises means for connecting said first signal generating means to the anode of said LASCR whereby to render said LASCR nonconductive in response to said first control signal.

Claim 11

An annunciator circuit for use with a photographic circuit, said photographic circuit including a first signal generating means for generating a first control signal, a second signal generating means for generating a second control signal, a light producing means responsive to said first control signal for initiating the operation of said light producing means whereby light is emitted therefrom, and a light quenching means responsive to said second control signal for initiating the operation of said light quenching means whereby said emitted light is effectively terminated, said annunciator circuit comprising: an annunciator indicator selectively operable between a first and a second condition; a control member serially connected in an energization circuit with said annunciator indicator, said control member being responsive to said second control signal to effect a closure of said energization circuit thereby activating said annunciator indicator from said first condition to said second condition; and means associated with said energization circuit for resetting said annunciator indicator to said first condition.

Claim 12

An annunciator circuit for use with a photographic circuit, said photographic circuit including a first signal generating means for generating a first control signal, a second signal generating means for generating a second control signal, a light producing means responsive to said first control signal for initiating the operation of said light producing means whereby light is emitted therefrom, and a light quenching means responsive to said second control signal for initiating the operation of said light quenching means whereby said emitted light is effectively terminated, said annunciator circuit comprising: an annunciator indicator selectively operable between a first and a second condition; a control member serially connected in an energization circuit with said annunciator indicator, said control member being responsive to said second control signal to effect a closure of said energization circuit thereby activating said annunciator indicator from said first condition to said second condition; and means associated with said energization circuit for resetting said annunciator indicator to said first condition.

Claim 13

The annunciator circuit as set forth in claim 10 wherein said means associated with said energization circuit is responsive to said first control signal for resetting said annunciator indicator to said first condition.

Claim 14

The annunciator circuit as set forth in claim 11 wherein said control member comprises a silicon controlled rectifier (SCR) having its anode-cathode path serially connected in said energization circuit, and means for connecting the gate electrode thereof to said second signal generating means whereby to render said SCR conductive in response to said second control signal.

Claim 15

The annunciator circuit as set forth in claim 12 wherein said means associated with said energization circuit comprises a capacitor connecting said anode of said SCR with said first signal generating means.

Claim 16

The annunciator circuit as set forth in claim 10 wherein said means associated with said energization circuit comprises a selectively operable switching means.

Claim 17

A photographic apparatus comprising: a first control signal generating means selectively operable for generating a first control signal: a light producing means operative in response to said first control signal for providing light to illuminate a scene; a second control signal generating means arranged to receive light from said scene, said second control signal generating means being operative to generate a secOnd control signal upon receipt thereby of a predetermined amount of light from said scene; light quenching means operative in response to said second control signal for effectively terminating said light provided by said light producing means; an annunciator indicator selectively operable between a first and a second condition; a control member serially connected in an energization circuit with said annunciator indicator, said control member being responsive to a signal indicative of a generation of said second control signal to effect a closure of said energization circuit thereby activating said annunciator indicator from said first condition to said second condition; and means associated with said energization circuit for resetting said annunciator indicator to said first condition.

Claim 18

A photographic apparatus comprising: a first control signal generating means selectively operable for generating a first control signal: a light producing means operative in response to said first control signal for providing light to illuminate a scene; a second control signal generating means arranged to receive light from said scene, said second control signal generating means being operative to generate a secOnd control signal upon receipt thereby of a predetermined amount of light from said scene; light quenching means operative in response to said second control signal for effectively terminating said light provided by said light producing means; an annunciator indicator selectively operable between a first and a second condition; a control member serially connected in an energization circuit with said annunciator indicator, said control member being responsive to a signal indicative of a generation of said second control signal to effect a closure of said energization circuit thereby activating said annunciator indicator from said first condition to said second condition; and means associated with said energization circuit for resetting said annunciator indicator to said first condition.

Claim 19

The photographic apparatus as set forth in claim 15 wherein said signal indicative of a generation of said second control signal is said second control signal, said control member comprising a silicon controlled rectifier (SCR) having its anode-cathode path serially connected in said energization circuit with said annunciator indicator, and means for applying said second control signal to the gate terminal of said SCR.

Claim 20

The photographic apparatus as set forth in claim 16 wherein said means associated with said energization circuit comprising a selectively operable switching means.

Claim 21

The photographic apparatus as set forth in claim 16 wherein said means associated with said energization circuit is responsive to said first control signal for resetting said annunciator indicator to said first condition.

Claim 22

The photographic apparatus as set forth in claim 18 wherein said means associated with said energization circuit comprises a capacitor connecting said anode of said SCR with said first signal generating means.

Claim 23

The photographic apparatus as set forth in claim 15 wherein said quenching means generates an incidental light during an operation thereof and said signal indicative of a generation of said second control signal is said incidental light, said control member comprising a light activated silicon controlled rectifier (LASCR) having its anode-cathode path serially connected in said energization circuit with said annunciator indicator, said LASCR being arranged in proximity to said light quenching means, said LASCR being rendered conductive, in response to said incidental light.

Claim 24

The photographic apparatus set forth in claim 20 wherein said means associated with said energization circuit comprises a selectively operable switching means.

Claim 25

The photographic apparatus as set forth in claim 20 wherein said means associated with said energization circuit is responsive to said first control signal for resetting said annunciator indicator to said first condition.

Claim 26

The photographic apparatus as set forth in claim 22 wherein said means associated with said energization circuit comprises a capacitor connecting said anode of said LASCR with said first signal generating means.