Patent US3683233A successfully refreshed from Google Patents.
US3683233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Input voltage control for the light integrating circuit of a pulsed flash device
Assignee: Loewe Opta GmbH
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Filing: 1970-07-28
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Granted: 1972-08-08
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Expires: 1990-07-28
Abstract
Abstract A thyristor-quenched pulse flash device employing a light integrating circuit to automatically control the operating duration of the device is provided with means for deriving the exciting voltage for the integrating circuit from the input circuit of the flash tube. A voltage divider is connected across the flash capacitor that feeds the main terminals of the flash tube, and the voltage developed across a resistance means within the voltage divider is coupled to the input of the integrating circuit through an additional thyristor switch that is enabled upon ignition of the flash tube. The resistance means may be a fixed discrete resistor, a variable resistor, or a selected one of a plurality of differently valued discrete resistors that is switched into the voltage divider.
Inventors
- 👤 Werner Heintze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:10
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/30; H05B41/32; H05B41/325
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
144 words
In an apparatus for rapidly terminating the output of a trigger-excited flash tube connected to a source of operating voltage when a controllable quantity of light has been emitted therefrom: an integrating circuit including a photosensitive element responsive to a portion of the emitted light to produce a control signal that varies in proportion to the amount of light integrated; means including a normally disabled gate for interconnecting the source of operating voltage with the input of the integrating circuit; means for simultaneously and independently triggering the flash tube and enabling the gate; at least a first normally disabled thyristor having its transconductive path coupled to the flash tube for interrupting the emitted light energy when a control electrode for the first thyristor is excited; and means for directly coupling the output of the integrating circuit to the control electrode of the first thyristor.
Claim 2
Dependent Claim
144 words
In an apparatus for rapidly terminating the output of a trigger-excited flash tube connected to a source of operating voltage when a controllable quantity of light has been emitted therefrom: an integrating circuit including a photosensitive element responsive to a portion of the emitted light to produce a control signal that varies in proportion to the amount of light integrated; means including a normally disabled gate for interconnecting the source of operating voltage with the input of the integrating circuit; means for simultaneously and independently triggering the flash tube and enabling the gate; at least a first normally disabled thyristor having its transconductive path coupled to the flash tube for interrupting the emitted light energy when a control electrode for the first thyristor is excited; and means for directly coupling the output of the integrating circuit to the control electrode of the first thyristor.
Claim 3
Dependent Claim
23 words
Apparatus as defined in claim 1, in which the transconductive path of the first thyristor is connected in shunt with the flash tube.
Claim 4
Dependent Claim
156 words
In an apparatus for rapidly terminating the output of a trigger-excited flash tube connected to a source of operating voltage when a controllable quantity of light has been emitted therefrom: an integrating circuit including a photosensitive element responsive to a portion of the emitted light to produce a control signal that varies in proportion to the amount of light integrated; means including a normally disabled thyristor having a transconductive path that interconnects the source of operating voltage with the input of the integrating circuit; means responsive to the triggering of the flash tube and coupled to the control electrode of the thyristor for triggering the thyristor; at least one additional, normally disabled thyristor having its transconductive path coupled to the flash tube for interrupting the emitted light energy when a control electrode of the additional thyristor is excited; and means for coupling the output of the integrating circuit to the control electrode of the additional thyristor.
Claim 5
Dependent Claim
156 words
In an apparatus for rapidly terminating the output of a trigger-excited flash tube connected to a source of operating voltage when a controllable quantity of light has been emitted therefrom: an integrating circuit including a photosensitive element responsive to a portion of the emitted light to produce a control signal that varies in proportion to the amount of light integrated; means including a normally disabled thyristor having a transconductive path that interconnects the source of operating voltage with the input of the integrating circuit; means responsive to the triggering of the flash tube and coupled to the control electrode of the thyristor for triggering the thyristor; at least one additional, normally disabled thyristor having its transconductive path coupled to the flash tube for interrupting the emitted light energy when a control electrode of the additional thyristor is excited; and means for coupling the output of the integrating circuit to the control electrode of the additional thyristor.
Claim 6
Dependent Claim
179 words
In an apparatus for rapidly terminating the output of a trigger-excited flash tube connected to a source of operating voltage when a controllable quantity of ligHt has been emitted therefrom: an integrating circuit including a photosensitive element responsive to a portion of the emitted light to produce a control signal that varies in proportion to the amount of light integrated; means including a normally disabled gate for interconnecting the source of operating voltage with the input of the integrating circuit; means responsive to the triggering of the flash tube for enabling the gate; at least a first normally disabled thyristor having a transconductive path connected in shunt with the flash tube for interrupting the emitted light energy when a control electrode of the first thyristor is excited; means for coupling the output of the integrating circuit to the control electrode of the first thyristor; a second normally disabled thyristor having its transconductive path connected in shunt with the flash tube; and means for connecting the transconductive path of the first thyristor to the control electrode of the second thyristor.
Claim 7
Dependent Claim
179 words
In an apparatus for rapidly terminating the output of a trigger-excited flash tube connected to a source of operating voltage when a controllable quantity of ligHt has been emitted therefrom: an integrating circuit including a photosensitive element responsive to a portion of the emitted light to produce a control signal that varies in proportion to the amount of light integrated; means including a normally disabled gate for interconnecting the source of operating voltage with the input of the integrating circuit; means responsive to the triggering of the flash tube for enabling the gate; at least a first normally disabled thyristor having a transconductive path connected in shunt with the flash tube for interrupting the emitted light energy when a control electrode of the first thyristor is excited; means for coupling the output of the integrating circuit to the control electrode of the first thyristor; a second normally disabled thyristor having its transconductive path connected in shunt with the flash tube; and means for connecting the transconductive path of the first thyristor to the control electrode of the second thyristor.
Claim 8
Dependent Claim
173 words
In an apparatus for rapidly terminating the output of a trigger-excited flash tube connected to a source of operating voltage when a controllable quantity of light has been emitted therefrom: an integrating circuit including a photosensitive element responsive to a portion of the emitted light to produce a control signal that varies in proportion to the amount of light integrated; a flash capacitor excited by the source of operating voltage and coupled to the main electrodes of the flash tube; a voltage divider whose input is connected across the flash capacitor; a normally disabled gate interconnecting the output of the voltage divider with the input of the integrating circuit; means for simultaneously and independently triggering the flash tube and enabling the gate; at least a first normally disabled thyristor having its transconductive path coupled to the flash tube for interrupting the emitted light energy when a control electrode for the first thyristor is excited; and means for directly coupling the output of the integrating circuit to the control electrode of the first thyristor.
Claim 9
Dependent Claim
173 words
In an apparatus for rapidly terminating the output of a trigger-excited flash tube connected to a source of operating voltage when a controllable quantity of light has been emitted therefrom: an integrating circuit including a photosensitive element responsive to a portion of the emitted light to produce a control signal that varies in proportion to the amount of light integrated; a flash capacitor excited by the source of operating voltage and coupled to the main electrodes of the flash tube; a voltage divider whose input is connected across the flash capacitor; a normally disabled gate interconnecting the output of the voltage divider with the input of the integrating circuit; means for simultaneously and independently triggering the flash tube and enabling the gate; at least a first normally disabled thyristor having its transconductive path coupled to the flash tube for interrupting the emitted light energy when a control electrode for the first thyristor is excited; and means for directly coupling the output of the integrating circuit to the control electrode of the first thyristor.
Claim 10
Dependent Claim
17 words
Apparatus as defined in claim 5, in which a variable resistor is connected in the voltage divider.
Claim 11
Dependent Claim
38 words
Apparatus as defined in claim 5, in which the apparatus further comprises, in combination, a plurality of discrete resistors of different values, and switching means for connecting a selected one of the discrete resistors into the voltage divider.
Claim 12
Dependent Claim
241 words
In an apparatus for rapidly terminating the output of a trigger-excited flash tube connected to a source of operating voltage when a controllable quantity of light has been emitted therefrom: an integrating circuit including a photosensitive element responsive to a portion of the emitted light to produce a control signal that varies in proportion to the amount of light integrated; a flash capacitor excited by the source of operating voltage and coupled to the main electrodes of the flash tube; a voltage divider whose input is connected across the flash capacitor; a plurality of discrete resistors of different values; switching means for connecting a selected one of the discrete resistors into the voltage divider; a normally disabled gate interconnecting the output of the voltage divider with the input of the integrating circuit; means responsive to the triggering of the flash tube for enabling the gate; at least a first normally disabled thyristor having its transconductive path coupled to the flash tube for interrupting the emitted light energy when a control electrode for the first thyristor is excited; and means for coupling the output of the integrating circuit to the control electrode of the first thyristor, the value of one of the discrete resistors being chosen such that the voltage at the input of the integrating circuit when the last-mentioned resistor is connected in the voltage divider by the switching means is less than the operating thresholD voltage of the integrating circuit.
Claim 13
Dependent Claim
241 words
In an apparatus for rapidly terminating the output of a trigger-excited flash tube connected to a source of operating voltage when a controllable quantity of light has been emitted therefrom: an integrating circuit including a photosensitive element responsive to a portion of the emitted light to produce a control signal that varies in proportion to the amount of light integrated; a flash capacitor excited by the source of operating voltage and coupled to the main electrodes of the flash tube; a voltage divider whose input is connected across the flash capacitor; a plurality of discrete resistors of different values; switching means for connecting a selected one of the discrete resistors into the voltage divider; a normally disabled gate interconnecting the output of the voltage divider with the input of the integrating circuit; means responsive to the triggering of the flash tube for enabling the gate; at least a first normally disabled thyristor having its transconductive path coupled to the flash tube for interrupting the emitted light energy when a control electrode for the first thyristor is excited; and means for coupling the output of the integrating circuit to the control electrode of the first thyristor, the value of one of the discrete resistors being chosen such that the voltage at the input of the integrating circuit when the last-mentioned resistor is connected in the voltage divider by the switching means is less than the operating thresholD voltage of the integrating circuit.
References Cited (Backward Citations)
US3541387A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |