EP0755174A3 - Static immunity for single touch flash charger control - Google Patents

Static immunity for single touch flash charger control Download PDF

Info

Publication number
EP0755174A3
EP0755174A3 EP96109905A EP96109905A EP0755174A3 EP 0755174 A3 EP0755174 A3 EP 0755174A3 EP 96109905 A EP96109905 A EP 96109905A EP 96109905 A EP96109905 A EP 96109905A EP 0755174 A3 EP0755174 A3 EP 0755174A3
Authority
EP
European Patent Office
Prior art keywords
single touch
charger control
capacitor
charging
flash charger
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.)
Withdrawn
Application number
EP96109905A
Other languages
German (de)
French (fr)
Other versions
EP0755174A2 (en
Inventor
Douglas William c/o Eastman Kodak Co. Constable
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.)
Eastman Kodak Co
Original Assignee
Eastman Kodak Co
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
Priority claimed from US08/575,658 external-priority patent/US5634153A/en
Application filed by Eastman Kodak Co filed Critical Eastman Kodak Co
Publication of EP0755174A2 publication Critical patent/EP0755174A2/en
Publication of EP0755174A3 publication Critical patent/EP0755174A3/en
Withdrawn legal-status Critical Current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

An electronic flash device (22) includes an illumination element, an actuation circuit (18, 19) having a flash capacitor (30) providing energy releasable to illuminate the element, and a self-oscillating charging circuit (28), having a transistor, for charging the capacitor (30). The invention is characterized by a resistor (35) located between a base of the transistor (46) and ground for preventing the self-oscillating circuit (28) from charging the capacitor (30) when the flash device (22) is exposed to an external static electric charge.
EP96109905A 1995-07-18 1996-06-20 Static immunity for single touch flash charger control Withdrawn EP0755174A3 (en)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US151495P 1995-07-18 1995-07-18
US1514 1995-07-18
US334595P 1995-09-07 1995-09-07
US3345 1995-09-07
US575658 1995-12-21
US08/575,658 US5634153A (en) 1995-12-21 1995-12-21 Static immunity for single touch flash charger control

Publications (2)

Publication Number Publication Date
EP0755174A2 EP0755174A2 (en) 1997-01-22
EP0755174A3 true EP0755174A3 (en) 1998-12-16

Family

ID=27356940

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96109905A Withdrawn EP0755174A3 (en) 1995-07-18 1996-06-20 Static immunity for single touch flash charger control

Country Status (2)

Country Link
EP (1) EP0755174A3 (en)
JP (1) JPH09113973A (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2470515A1 (en) * 1979-11-26 1981-05-29 Fuji Koeki Corp POWER SUPPLY FOR AN ELECTRIC FLASH DEVICE
EP0044368A1 (en) * 1980-06-30 1982-01-27 Jules Eugene Jean Mettler Device permitting the control of static electrical charge of phonographic discs
GB2133644A (en) * 1983-01-14 1984-07-25 Fuji Koeki Corp Photographic flash apparatus
EP0443055A1 (en) * 1990-02-20 1991-08-28 Siemens Aktiengesellschaft Input protection structure for integrated circuits
JPH0519337A (en) * 1991-07-10 1993-01-29 Olympus Optical Co Ltd Flash light emission device
WO1996001034A2 (en) * 1994-06-30 1996-01-11 Eastman Kodak Company Single touch flash charger control

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2470515A1 (en) * 1979-11-26 1981-05-29 Fuji Koeki Corp POWER SUPPLY FOR AN ELECTRIC FLASH DEVICE
EP0044368A1 (en) * 1980-06-30 1982-01-27 Jules Eugene Jean Mettler Device permitting the control of static electrical charge of phonographic discs
GB2133644A (en) * 1983-01-14 1984-07-25 Fuji Koeki Corp Photographic flash apparatus
EP0443055A1 (en) * 1990-02-20 1991-08-28 Siemens Aktiengesellschaft Input protection structure for integrated circuits
JPH0519337A (en) * 1991-07-10 1993-01-29 Olympus Optical Co Ltd Flash light emission device
WO1996001034A2 (en) * 1994-06-30 1996-01-11 Eastman Kodak Company Single touch flash charger control

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 017, no. 290 (P - 1549) 3 June 1993 (1993-06-03) *

Also Published As

Publication number Publication date
JPH09113973A (en) 1997-05-02
EP0755174A2 (en) 1997-01-22

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