FR2450027A1 - Automatic camera flash unit - has delay device between input for reflected light and trigger switch preceding flash tube - Google Patents

Automatic camera flash unit - has delay device between input for reflected light and trigger switch preceding flash tube

Info

Publication number
FR2450027A1
FR2450027A1 FR7904237A FR7904237A FR2450027A1 FR 2450027 A1 FR2450027 A1 FR 2450027A1 FR 7904237 A FR7904237 A FR 7904237A FR 7904237 A FR7904237 A FR 7904237A FR 2450027 A1 FR2450027 A1 FR 2450027A1
Authority
FR
France
Prior art keywords
flash tube
delay device
tube
input
reflected light
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
Application number
FR7904237A
Other languages
French (fr)
Other versions
FR2450027B1 (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujinon Corp
Original Assignee
Fuji Photo Optical Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fuji Photo Optical Co Ltd filed Critical Fuji Photo Optical Co Ltd
Priority to FR7904237A priority Critical patent/FR2450027A1/en
Publication of FR2450027A1 publication Critical patent/FR2450027A1/en
Application granted granted Critical
Publication of FR2450027B1 publication Critical patent/FR2450027B1/fr
Granted legal-status Critical Current

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

Abstract

The automatic flash system for a camera has a voltage amplifier (1) forming a booster for the power supply (E) connected by a diode (2) to the flash tube (5) and its quenching tube (6). Interconnected with them is a monostable multivibrator (14) for the booster, and a trigger circuit (4) preceding the flash tube. Between this part of the circuit and a parallel section containing two operational amplifiers (11, 12) and a trigger circuit (13) for providing signals corresponding to light reflected from the subject, is a delay device (7). This controls the input amplifier (11) after operation of the flash tube. The voltage amplifier is delayed for a given time by a signal which triggers the flash tube.
FR7904237A 1979-02-20 1979-02-20 Automatic camera flash unit - has delay device between input for reflected light and trigger switch preceding flash tube Granted FR2450027A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7904237A FR2450027A1 (en) 1979-02-20 1979-02-20 Automatic camera flash unit - has delay device between input for reflected light and trigger switch preceding flash tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7904237A FR2450027A1 (en) 1979-02-20 1979-02-20 Automatic camera flash unit - has delay device between input for reflected light and trigger switch preceding flash tube

Publications (2)

Publication Number Publication Date
FR2450027A1 true FR2450027A1 (en) 1980-09-19
FR2450027B1 FR2450027B1 (en) 1982-01-29

Family

ID=9222177

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7904237A Granted FR2450027A1 (en) 1979-02-20 1979-02-20 Automatic camera flash unit - has delay device between input for reflected light and trigger switch preceding flash tube

Country Status (1)

Country Link
FR (1) FR2450027A1 (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1585570A (en) * 1968-04-03 1970-01-23
DE1913796B1 (en) * 1969-03-19 1970-12-10 Metz App Werke Inh Paul Metz Electronic flash unit with automatic light control
US3644818A (en) * 1971-03-10 1972-02-22 Gte Sylvania Inc Electronic flashlamp power supply
US3727100A (en) * 1971-06-28 1973-04-10 Toshiba Photo Prod Co Ltd Electronic flash apparatus having control means for pre-enabling light responsive circuit means
US3758822A (en) * 1972-04-20 1973-09-11 Honeywell Inc Computer type flash apparatus with noise inhibiting quench circuit
FR2171798A5 (en) * 1972-02-12 1973-09-21 Braun Ag
US3769546A (en) * 1972-05-17 1973-10-30 W Pecher Electronic flash device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1585570A (en) * 1968-04-03 1970-01-23
DE1913796B1 (en) * 1969-03-19 1970-12-10 Metz App Werke Inh Paul Metz Electronic flash unit with automatic light control
US3644818A (en) * 1971-03-10 1972-02-22 Gte Sylvania Inc Electronic flashlamp power supply
US3727100A (en) * 1971-06-28 1973-04-10 Toshiba Photo Prod Co Ltd Electronic flash apparatus having control means for pre-enabling light responsive circuit means
FR2171798A5 (en) * 1972-02-12 1973-09-21 Braun Ag
US3758822A (en) * 1972-04-20 1973-09-11 Honeywell Inc Computer type flash apparatus with noise inhibiting quench circuit
US3769546A (en) * 1972-05-17 1973-10-30 W Pecher Electronic flash device

Also Published As

Publication number Publication date
FR2450027B1 (en) 1982-01-29

Similar Documents

Publication Publication Date Title
IT7805132A0 (en) SAFETY DEVICE FOR GUNS WITH AUTOMATIC HAMMER RELEASE.
FR2450027A1 (en) Automatic camera flash unit - has delay device between input for reflected light and trigger switch preceding flash tube
JPS5470825A (en) Automatic strobo device
JPS5638031A (en) Automatic dimming electronic flash device
FR2382672A1 (en) Missile light operated proximity detector - has laser diode source associated with rapid switching logic amplifier and electrically fired fuse
JPS53148372A (en) Integrating circuit
FR2401586A1 (en) Flashing light display for road-works - is made up of chain of flash units each incorporating oscillator, multivibrator switching and control circuits
JPS57127343A (en) Talking system of optical fiber interphone
SU370591A1 (en) DEVICE FOR CONTROLLING A LIGHT BEACON
JPS5448414A (en) Optical relay unit
IL54977A (en) Re-cocking trigger device having an externally influenceable mechanism for the striker-pin
FR2404194A1 (en) Anti-tank missile firing circuit - has lithium batteries connected by arming lever to continuous current transformer and capacitor
JPS5754443A (en) Optical pulse transmitting and receiving system
FR1112316A (en) Improved device for igniting an electric signal light for cycles, cyclo-engines, etc. by brake control
JPS6460104A (en) Device for amplifying and comparing signal
JPS5292456A (en) Automatic power control system
JPS57210466A (en) Tape recorder
ES370659A1 (en) Video amplifier
JPS5591244A (en) Duplicating system for light emission source
JPS5310927A (en) Bias light stabilizing circuit for pickup tube
JPS5469303A (en) Light communication system
JPS5294122A (en) Energizing and deenegrizing system for electromagnetic mechanism of ca mera
JPS529787A (en) Sequence control device for cylinder
JPS56138336A (en) Optical not circuit
JPS56112130A (en) Optical data way equipment

Legal Events

Date Code Title Description
ST Notification of lapse