GB1331328A – Electronic flashlight units
– Google Patents
GB1331328A – Electronic flashlight units
– Google Patents
Electronic flashlight units
Info
Publication number
GB1331328A
GB1331328A
GB1083071*[A
GB1083071A
GB1331328A
GB 1331328 A
GB1331328 A
GB 1331328A
GB 1083071 A
GB1083071 A
GB 1083071A
GB 1331328 A
GB1331328 A
GB 1331328A
Authority
GB
United Kingdom
Prior art keywords
capacitor
thyristor
thyristors
discharge
tube
Prior art date
1970-05-05
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.)
Expired
Application number
GB1083071*[A
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.)
MULTIBLITZ MANNESMANN CO GmbH Co
Original Assignee
MULTIBLITZ MANNESMANN CO GmbH 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.)
1970-05-05
Filing date
1971-04-22
Publication date
1973-09-26
1970-05-05
Priority claimed from DE19702021880
external-priority
patent/DE2021880A1/en
1970-08-05
Priority claimed from DE19702038859
external-priority
patent/DE2038859A1/en
1971-04-22
Application filed by MULTIBLITZ MANNESMANN CO GmbH Co
filed
Critical
MULTIBLITZ MANNESMANN CO GmbH Co
1973-09-26
Publication of GB1331328A
publication
Critical
patent/GB1331328A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
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
H05B41/325—Circuit arrangements in which the lamp is fed by pulses, e.g. flash lamp for single flash operation by measuring the incident light
Abstract
1331328 Electronic Flash Control MULTIBLITZ DR ING D A MANNESMANN GmbH & CO KG 22 April 1971 [5 May 1970 5 Aug 1970] 10830/71 Heading G2A [ Also in division H3] A flashlight unit comprises a flash tube 16 provided with an ignition electrode 24, a photo sensitive resistor 58 adapted to receive the light reflected from an object, a thyristor 22 connected in series with the tube, a capacitor 60 for integrating the reflected light flux and a quenching circuit for quenching the flash discharge when the integrated light flux reaches a pre-determined level. Closure of a switch 30 enables a capacitor 28 to discharge through the primary of a transformer 26 which supplies an ignition pulse to the electrode 24. Simultaneously, the increased voltage across a resistor 32 due to the closure of the switch, causes a diac 42 to condut and a capacitor 40 supplies a pulse to the gate electrode of the thyristor 22. A storage capacitor 14 therefore discharges through the tube 16 and a voltage appears across a resistor 20. The capacitor 60 charges up to a voltage dependent on the total light flux received by the photo sensitive resistor 58. At the pre-determined level a thyristor tetrode 64 becomes conductive enabling a capacitor 66 to discharge and supply a pulse to the gate electrode of a thyristor 50. A commutating capacitor 46 therefore supplies a positive potential to the cathode of the thyristor 22 which is thereby switched off to quench the tube discharge. In a modification the thyristors 22, 50 are each replaced by a pair of parallel connected thyristors, the diac 42 and the thyristors tetrode 64 also being replaced by thyristors.
GB1083071*[A
1970-05-05
1971-04-22
Electronic flashlight units
Expired
GB1331328A
(en)
Applications Claiming Priority (2)
Application Number
Priority Date
Filing Date
Title
DE19702021880
DE2021880A1
(en)
1970-05-05
1970-05-05
Electronic flash unit
DE19702038859
DE2038859A1
(en)
1970-08-05
1970-08-05
Electronic flash unit
Publications (1)
Publication Number
Publication Date
GB1331328A
true
GB1331328A
(en)
1973-09-26
Family
ID=25759082
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB1083071*[A
Expired
GB1331328A
(en)
1970-05-05
1971-04-22
Electronic flashlight units
Country Status (8)
Country
Link
US
(1)
US3808500A
(en)
AT
(1)
AT316307B
(en)
CA
(1)
CA921549A
(en)
CH
(1)
CH522894A
(en)
ES
(1)
ES390865A1
(en)
FR
(1)
FR2093492A5
(en)
GB
(1)
GB1331328A
(en)
NL
(1)
NL7106106A
(en)
Families Citing this family (3)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
DE2305782A1
(en)
*
1973-02-07
1974-08-08
Rollei Werke Franke Heidecke
ELECTRONIC FLASH UNIT FOR PHOTOGRAPHIC PURPOSES
US3976914A
(en)
*
1975-05-27
1976-08-24
Honeywell Inc.
Series SCR gate hold-on circuit
JPS5421070A
(en)
*
1977-07-18
1979-02-16
West Electric Co
Electronic flashing device
Family Cites Families (7)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US3229158A
(en)
*
1962-02-21
1966-01-11
Honeywell Inc
Electronic photographic flash apparatus with photosensitive capacitor charge monitoring
US3344311A
(en)
*
1965-05-24
1967-09-26
Gen Electric
Compensating control circuit
US3344310A
(en)
*
1966-01-13
1967-09-26
Gen Electric
Universal lamp control circuit with high voltage producing means
US3591829A
(en)
*
1967-04-20
1971-07-06
Minolta Camera Kk
Automatic control device for electronic flash
US3510750A
(en)
*
1967-11-28
1970-05-05
Masao Horino
Rectified output voltage control device
DE1814856A1
(en)
*
1968-12-11
1970-07-16
Loewe Opta Gmbh
Electronic flash unit with a device for regulating the duration of the flash
DE1905223A1
(en)
*
1969-01-28
1970-08-13
Loewe Opta Gmbh
Electronic flash unit with flash duration control device
1971
1971-04-21
CH
CH601371A
patent/CH522894A/en
not_active
IP Right Cessation
1971-04-22
GB
GB1083071*[A
patent/GB1331328A/en
not_active
Expired
1971-04-23
AT
AT354271A
patent/AT316307B/en
not_active
IP Right Cessation
1971-04-26
US
US00137411A
patent/US3808500A/en
not_active
Expired – Lifetime
1971-05-04
CA
CA112113A
patent/CA921549A/en
not_active
Expired
1971-05-04
NL
NL7106106A
patent/NL7106106A/xx
unknown
1971-05-04
FR
FR7117243A
patent/FR2093492A5/fr
not_active
Expired
1971-05-04
ES
ES390865A
patent/ES390865A1/en
not_active
Expired
Also Published As
Publication number
Publication date
FR2093492A5
(en)
1972-01-28
CH522894A
(en)
1972-05-15
NL7106106A
(en)
1971-11-09
AT316307B
(en)
1974-07-10
CA921549A
(en)
1973-02-20
US3808500A
(en)
1974-04-30
ES390865A1
(en)
1973-07-01
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Legal Events
Date
Code
Title
Description
1974-02-13
PS
Patent sealed [section 19, patents act 1949]
1975-11-26
PLNP
Patent lapsed through nonpayment of renewal fees
