FR2450028A1 - Circuit de commande pour un dispositif de lampe eclair electronique automatique - Google Patents
Circuit de commande pour un dispositif de lampe eclair electronique automatiqueInfo
- Publication number
- FR2450028A1 FR2450028A1 FR7904239A FR7904239A FR2450028A1 FR 2450028 A1 FR2450028 A1 FR 2450028A1 FR 7904239 A FR7904239 A FR 7904239A FR 7904239 A FR7904239 A FR 7904239A FR 2450028 A1 FR2450028 A1 FR 2450028A1
- Authority
- FR
- France
- Prior art keywords
- amplifier
- input
- operational amplifier
- light measuring
- logarithmic characteristic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/30—Circuit arrangements in which the lamp is fed by pulses, e.g. flash lamp
- H05B41/32—Circuit arrangements in which the lamp is fed by pulses, e.g. flash lamp for single flash operation
Landscapes
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
CIRCUIT DE COMMANDE POUR UN DISPOSITIF DE LAMPE ECLAIR ELECTRONIQUE AUTOMATIQUE. LE CIRCUIT COMPORTE UN CIRCUIT PHOTOMETRIQUE QUI COMPORTE UN AMPLIFICATEUR OPERATIONNEL 11, UN PHOTODETECTEUR 10 CONNECTE ENTRE LES ENTREES POSITIVE ET NEGATIVE DE L'AMPLIFICATEUR ET UNE DIODE LOGARITHMIQUE 12 MONTEE DANS LE CIRCUIT DE REACTION DE L'AMPLIFICATEUR POUR EFFECTUER LA COMPRESSION LOGARITHMIQUE DU SIGNAL DE SORTIE DU CIRCUIT PHOTOMETRIQUE, SIGNAL QUI EST APPLIQUE PAR L'INTERMEDIAIRE D'UNE DIODE 13 D'EXPANSION LOGARITHMIQUE, A UN CIRCUIT DE CALCUL 14 A 21QUI PRODUIT UN SIGNAL DE SORTIE POUR COMMANDER LA DUREE D'EXPOSITION. APPLICATION AUX APPAREILS PHOTOGRAPHIQUES.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7904239A FR2450028A1 (fr) | 1979-02-20 | 1979-02-20 | Circuit de commande pour un dispositif de lampe eclair electronique automatique |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7904239A FR2450028A1 (fr) | 1979-02-20 | 1979-02-20 | Circuit de commande pour un dispositif de lampe eclair electronique automatique |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2450028A1 true FR2450028A1 (fr) | 1980-09-19 |
FR2450028B1 FR2450028B1 (fr) | 1983-09-30 |
Family
ID=9222179
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7904239A Granted FR2450028A1 (fr) | 1979-02-20 | 1979-02-20 | Circuit de commande pour un dispositif de lampe eclair electronique automatique |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2450028A1 (fr) |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3781693A (en) * | 1972-03-29 | 1973-12-25 | Itek Corp | Logarithmic amplification circuit |
US3875471A (en) * | 1974-01-18 | 1975-04-01 | Berkey Photo Inc | Photoflash source control circuit |
US3919593A (en) * | 1972-08-28 | 1975-11-11 | Canon Kk | Flash safety device in a flash apparatus |
DE2422237A1 (de) * | 1974-05-08 | 1975-11-27 | Braun Ag | Lichtmengengeregeltes blitzlichtgeraet |
US3992622A (en) * | 1974-11-25 | 1976-11-16 | Fuji Photo Optical Co., Ltd. | Logarithmic amplifier with temperature compensation means |
US4096382A (en) * | 1976-02-09 | 1978-06-20 | Fuji Photo Optical Co., Ltd. | Photo-current log-compression circuit |
US4101841A (en) * | 1976-09-03 | 1978-07-18 | Hitachi, Ltd. | Gain control circuit |
-
1979
- 1979-02-20 FR FR7904239A patent/FR2450028A1/fr active Granted
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3781693A (en) * | 1972-03-29 | 1973-12-25 | Itek Corp | Logarithmic amplification circuit |
US3919593A (en) * | 1972-08-28 | 1975-11-11 | Canon Kk | Flash safety device in a flash apparatus |
US3875471A (en) * | 1974-01-18 | 1975-04-01 | Berkey Photo Inc | Photoflash source control circuit |
DE2422237A1 (de) * | 1974-05-08 | 1975-11-27 | Braun Ag | Lichtmengengeregeltes blitzlichtgeraet |
US3992622A (en) * | 1974-11-25 | 1976-11-16 | Fuji Photo Optical Co., Ltd. | Logarithmic amplifier with temperature compensation means |
US4096382A (en) * | 1976-02-09 | 1978-06-20 | Fuji Photo Optical Co., Ltd. | Photo-current log-compression circuit |
US4101841A (en) * | 1976-09-03 | 1978-07-18 | Hitachi, Ltd. | Gain control circuit |
Non-Patent Citations (1)
Title |
---|
EXBK/76 * |
Also Published As
Publication number | Publication date |
---|---|
FR2450028B1 (fr) | 1983-09-30 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |