US3726631A - Device for the consecutive ignition of combustion flash-light lamps - Google Patents

Device for the consecutive ignition of combustion flash-light lamps Download PDF

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Publication number
US3726631A
US3726631A US00074542A US3726631DA US3726631A US 3726631 A US3726631 A US 3726631A US 00074542 A US00074542 A US 00074542A US 3726631D A US3726631D A US 3726631DA US 3726631 A US3726631 A US 3726631A
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United States
Prior art keywords
lamp
lamps
flash
ignition
circuit
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Expired - Lifetime
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US00074542A
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English (en)
Inventor
Graaf W De
P Tielemans
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US Philips Corp
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US Philips Corp
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Priority claimed from NL6915055.A external-priority patent/NL158299B/xx
Application filed by US Philips Corp filed Critical US Philips Corp
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B15/00—Special procedures for taking photographs; Apparatus therefor
    • G03B15/02—Illuminating scene
    • G03B15/03—Combinations of cameras with lighting apparatus; Flash units
    • G03B15/04—Combinations of cameras with non-electronic flash apparatus; Non-electronic flash units
    • G03B15/0452—Electrical ignition means connected to the shutter
    • G03B15/0457—Ignition mechanisms for sequential ignition of flash lamps

Definitions

  • the invention relates to a device comprising at least two combustion flash-light lamps and means for igniting these lamps in order of succession, in which device a first circuit including an externally accessible switching element shunts a second circuit including a filament of one of these flash-light lamps, said switching element responding to the energy released in a flash-light lamp during ignition.
  • the invention has for its object to provide a device of the kind set forth in which this disadvantage does not occur or is at least mitigated.
  • the invention has for its object to provide a solution both for the series combination and the parallel combination of the lamps.
  • a device in accordance with the invention is characterized in that the lamps are connected in series and the switching element is formed by a break contact responding to the ignition of a lamp other than that whose circuit including the filament is shunted by the switching-element circuit and in that the connection of the terminals of said other lamp has a low ohmic value subsequent to the ignition of said lamp.
  • the device in accordance with the invention comprising at least two parallel-connected combustion flash-light lamps and means for igniting said lamps in order of succession, in which device a circuit including an externally accessible switching element shunts a second circuit including the filament of one of these lamps, said switching element responding to the energy released in a flash-lamp upon ignition, is characterized in that the switching element isformed by a break contact which responds to the ignition of a lamp other than that whose filamenet-including circuit is shunted by the switching element and prior to the ignition of the lamps the resistance of the connection of the terminals of the device via the other lamp has a lower ohmic value that that of a further connection of the terminals and subsequent to the ignition of the other lamp the resistance of the connection of the terminals of the device via said other lamp has a higher value than that of a further connection of the terminals.
  • the interrupting contact can respond to an increase in pressure in the ignited lamp. If this contact is arranged, for example, at a sealing area of the lamp and if it is ensured that the contact is interrupted when the lamp ignites, a device according to the invention will be obtained.
  • the switching element is preferably constructed so that it responds to the energy released in the other lamp in the form of heat, the switching element being then formed by an interrupting melting contact.
  • the low-ohmic connection of the terminals of the other lamp may be obtained by using lamps having a fairly low ohmic value after ignition.
  • a device according to the invention having a series connection of flashsaid lamp, whilst the resistance of said lamp prior to ignition is about 1 Ohm and the value of the shunting resistor lies between 0.5 Ohm and 6 Ohms.
  • the low ohmic connection of the terminals of the other lamp is established by a make contact shunting said lamp, said contact responding to the energy released by the ignition of said lamp.
  • each lamp is also connected in series with a switching element associated with the lamp and formed by a break contact responding to the ignition of the lamp.
  • This embodiment has the advantage that the lamp need not be removed from its holder, because it is ensured by a second break contact that in fact the connection of the terminals of the device via the ignited lamp has become high ohmic because after ignition this break contact produces a void in the circuit.
  • FIG. 1 shows a circuitry of a device in accordance with the invention
  • I FIG. 2 shows a second circuitry of a further device in accordance with the invention.
  • reference numerals l and 2 designate connecting terminals. They can be connected to a capacitor.
  • the connection to the capacitor can be established by means of a switch which is closed for a short time upon the actuation of a shutter of a photocamera.
  • the capacitor may first be charged in some way or other, for example, to 9 to V.
  • the terminals 1 and 2 may, if desired, be connected to a different, suitable voltage source.
  • the terminals 1 and 2 are connected by the series connection of two low-voltage combustion flash-light lamps 3 and 4.
  • the lamp 3 is shunted by a resistor 5.
  • the lamp 4 is shunted by an interrupting melting contact 6.
  • the resistance of the lamps 3 and 4 was about l Ohm, the resistor 5 had a value of 2 Ohms.
  • the arrangement operates as follows. When a voltage is applied to the terminals 1 and 2 first a partial current passes through the lamp 3, which is thus ignited. The ignition of this lamp results in fusion of the strip 6. Thus the short-circuit across the lamp 4 is obviated. Subsequently a voltage is again applied to the terminals '1 and 2. Then thelamp 4 is ignited, by means of a current through the resistor S.
  • the sequence of flash-light lamps may be extended to a sequence of three or more series-connected flash-light lamps.
  • the first lamp was shunted by a resistance of about 0.55 Ohm, the second by an ohmic resistor of about 1 Ohm, the third by an ohmic resistor of about 2 Ohm and the fourth by an ohmic resistor of about 4.5 Ohms.
  • the fifth lamp was, of course, not shunted by a resistor.
  • the second, third, fourth and fifth lamps were each shunted by an interrupting fusible contact.
  • FIG. 2 shows a parallel combination of flash-light lamps.
  • Reference numerals 20 and 21 in this Figure designate connecting terminals similar to the terminals 1 and 2 of FIG. 1. Also the terminals 20 and 21 may be connected to a supply capacitor.
  • FIG. 2 shows furthermore three flash-light lamps 22, 23 and 24.
  • the lamp 22 is connected in series with a fusible strip 25, the lamp 23 with a fusible strip 26 and a resistor 27 and the lamp 24 with a fusible strip 28 and a resistor 29.
  • the lamp 22 is connected in series with a fusible strip 25, the lamp 23 with a fusible strip 26 and a resistor 27 and the lamp 24 with a fusible strip 28 and a resistor 29.
  • lamp 23 is shunted by a fusible strip 30 and the series 6 connection of lamp 24 and fusible strip 28 is shunted by a fusible strip 31.
  • the arrangement is such that the fusible strip 30 responds to the development of heat in the lamp 22.
  • the fusible strip 25 also responds to heat developed in the lamp 22.
  • the fusible strips 26 and 31 respond to heat developed in the lamp 23 and the fusible strip 28 responds to heat developed in the lamp 24.
  • the resistors 27 and 29 had values of 1.3 Ohms and 4 Ohms respectively. Prior to fusion the fusible strips had a re sistance value of less than 0.1 Ohm.
  • the flash-light lamps 22, 23 and 24 had prior to ignition a resistance value of about 1 Ohm and after ignition a resistance of more than 1000 ohms in about percent of the cases and in the remaining cases a resistance between about 0.5 and 10 Ohms.
  • the arrangement shown in FIG. 2 operates as followsi
  • a voltage is applied to the terminals 20 and 21
  • the lamp 22 will ignite, because the circuit of the lamps 23 and 24 includes resistors (27 and 29).
  • the ignition of the lamp 22 causes fusion of strips 25 and 30.
  • Owing to the fusion of the strip 25 the lamp 22 is put out of circuit.
  • Owing to the fusion of strip 30 a short-circuit across the lamp 23 is obviated.
  • This means that the lamp 23 is made ready for use.
  • a voltage is applied to the terminals 20 and 21
  • the lamp 23 is ignited.
  • the lamp 23 gets out of circuit owing to the fusion of the strip 26, whilst owing to the fusion of the strip 31 the short-circuit across the lamp 24 is obviated.
  • the last lamp 24 is ignited.
  • the resistor across the lamp 3 may be replaced by a make contact responding to the ignition of the lamp 3.
  • the resistors 27 and 29 may be replaced by resistors included in the continuous conductors, forexample, at the positions A and B(see FIG. 2).
  • An arrangement for the sequential operation of combustion-type flash light lamps intended for use with a flash-operating camera mechanism comprising:
  • a break contactswitching element being responsive to the energy released by a first lamp of said circuit, and also being connected in shunt arrange-' ment with a second lamp of said circuit, said switching element also being external to said camera mechanism and accessible to a user of said mechanism and adapted to being broken by the user in the event said first lamp fails to flash;
  • said low ohmic means being a resistor permanently shunting said first lamp.
  • said switching element also being external to said camera mechanism and accessible to a user of said mechanism and adapted to being broken by the user in the event said first lamp fails to flash;
  • switching means responsive to the energy released by said first lamp, for opening the circuit of said first leg after ignition of said first lamp.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
  • Stroboscope Apparatuses (AREA)
US00074542A 1969-10-03 1970-09-23 Device for the consecutive ignition of combustion flash-light lamps Expired - Lifetime US3726631A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6915055.A NL158299B (nl) 1947-03-25 1969-10-03 Inrichting voor het na elkaar ontsteken van verbrandingsflitslampen.

Publications (1)

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US3726631A true US3726631A (en) 1973-04-10

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US00074542A Expired - Lifetime US3726631A (en) 1969-10-03 1970-09-23 Device for the consecutive ignition of combustion flash-light lamps

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US (1) US3726631A (enrdf_load_html_response)
JP (1) JPS5317899B1 (enrdf_load_html_response)
AT (1) AT334201B (enrdf_load_html_response)
BE (1) BE757008A (enrdf_load_html_response)
CH (1) CH543845A (enrdf_load_html_response)
GB (1) GB1330906A (enrdf_load_html_response)
SE (1) SE354563B (enrdf_load_html_response)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4087724A (en) * 1975-06-05 1978-05-02 U.S. Philips Corporation Flash array provided with at least two combustion flash lamps
JPS53123921A (en) * 1977-04-04 1978-10-28 Philips Nv Flash bulb unit
US4432723A (en) * 1982-07-12 1984-02-21 Gte Products Corporation Multilamp photoflash unit with improved quick-disconnect switch

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20250067734A1 (en) 2021-11-18 2025-02-27 Asahi Kasei Kabushiki Kaisha Fluorescent Cellulose Particles

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3443875A (en) * 1965-10-21 1969-05-13 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Series flash device
US3458270A (en) * 1966-06-04 1969-07-29 Philips Corp Series flash-lamp unit
US3518487A (en) * 1967-01-31 1970-06-30 Tokyo Shibaura Electric Co Photoflashing circuit device
US3532931A (en) * 1968-12-16 1970-10-06 Gen Electric Photoflash assembly for sequentially flashing lamps utilizing voltage and current responsive devices
US3544251A (en) * 1968-10-01 1970-12-01 Polaroid Corp Apparatus for sequentially selecting photoflash lamps for ignition
US3562508A (en) * 1966-02-18 1971-02-09 Agfa Gevaert Ag Flash unit

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3443875A (en) * 1965-10-21 1969-05-13 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Series flash device
US3562508A (en) * 1966-02-18 1971-02-09 Agfa Gevaert Ag Flash unit
US3458270A (en) * 1966-06-04 1969-07-29 Philips Corp Series flash-lamp unit
US3518487A (en) * 1967-01-31 1970-06-30 Tokyo Shibaura Electric Co Photoflashing circuit device
US3544251A (en) * 1968-10-01 1970-12-01 Polaroid Corp Apparatus for sequentially selecting photoflash lamps for ignition
US3532931A (en) * 1968-12-16 1970-10-06 Gen Electric Photoflash assembly for sequentially flashing lamps utilizing voltage and current responsive devices

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4087724A (en) * 1975-06-05 1978-05-02 U.S. Philips Corporation Flash array provided with at least two combustion flash lamps
JPS53123921A (en) * 1977-04-04 1978-10-28 Philips Nv Flash bulb unit
FR2386775A1 (fr) * 1977-04-04 1978-11-03 Philips Nv Unite de lampes flash
US4432723A (en) * 1982-07-12 1984-02-21 Gte Products Corporation Multilamp photoflash unit with improved quick-disconnect switch

Also Published As

Publication number Publication date
BE757008A (fr) 1971-04-02
JPS5317899B1 (enrdf_load_html_response) 1978-06-12
GB1330906A (en) 1973-09-19
SE354563B (enrdf_load_html_response) 1973-03-12
DE2046187B2 (de) 1977-04-21
ATA882970A (de) 1976-04-15
CH543845A (de) 1973-10-31
DE2046187A1 (de) 1971-04-15
AT334201B (de) 1976-01-10

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