US3918882A - Flash lamp unit - Google Patents

Flash lamp unit Download PDF

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Publication number
US3918882A
US3918882A US455225A US45522574A US3918882A US 3918882 A US3918882 A US 3918882A US 455225 A US455225 A US 455225A US 45522574 A US45522574 A US 45522574A US 3918882 A US3918882 A US 3918882A
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US
United States
Prior art keywords
pin
base plate
flash lamp
lamp unit
springs
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.)
Expired - Lifetime
Application number
US455225A
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English (en)
Inventor
Der Laan Jan Van
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.)
US Philips Corp
Original Assignee
US Philips Corp
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 US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US3918882A publication Critical patent/US3918882A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • G03B15/0478—Combinations of photographic apparatus with percussion type flash ignition systems
    • G03B15/0484—Constructional details of the flash apparatus

Definitions

  • the invention relates to a flash lamp unit having at Apr. 24. 1973 Netherlands 4. 7305669 number of percussion flash lamps aHanged on a base plate. which base plate comprises a central pin which 2 extends transversely to the plane of the base plate and Field of Search 431/9204; the free end wh'ch remote the base pm a 140/1 354/143 number of springs are secured.
  • the invention relates to a flash lamp unit which can be coupled to a camera so as to be rotatable and which comprises a base plate and a number of percussion flash lamps arranged on said base plate, which flash lamp unit comprises a number of springs corresponding to the number ofthe flash lamps and of each of which a connection part is locked relative to the base plate, of which a second part extends mainly transversely to the plane of the base plate, and of which a third part is designed to percuss against a metal tube occurring on each of the flash lamps, said tube comprising an ignition mass and an anvil.
  • a flash lamp unit is known.
  • the springs occurring in said known flashlampunit are formed from a metal wire which is bent mainly in the form of a U and which extends transversely tothe plane of the base plate.
  • One free end of the U-shaped wire comprises a bent end portion with which the metal wire is locked in the base plate, the stretched portion of the spring designed to cooperate with a flash lamp occurring at the other free end of the U-shaped metal wire.
  • connection parts of the springs have to be embedded in the material of the base plate, during which operation the material of the base plate'should be locally heated. This operation constitutes a possibility of stagnation during the production process.
  • the springs may be embedded in'a wrongposition in the material of the base plate so that the ready functioning of the springs is impeded.
  • the flashlamp unit according to the invention is characterized in that on the .center of the base plate a pin is present which extends transversely to the plane of the base plate and to the free end of which the connection part of each of the springs is secured.
  • the springs are preferably coupled in pairs by a common connection part.
  • a common connection part As a result of this the advantage is achieved that during assembly of the unit which comprises, for example, four lamps, not four separate springs are to be treated but only two mainly U-shaped spring constellations. Due to their U-shape said spring constellation can be very readily handled.
  • a favourable embodiment of the flashlamp unit according to the invention is characterized in that the end face of the free end of the pin remote from the base plate comprises two slots in which the connection parts of the springs are clamped.
  • the connection of the connection parts in the slots may be a snap connection in which an extra lock can be obtained by choosing the length of the pin to be so that the end face of the pin supports against the inside of a light-permeable cap forming part of the unit, which cap surrounds the flash lamps and is secured to the circumference of the base plate.
  • the springs are clamped against the side walls-of the pin in a place between the end face of the pin and the base plate by means of a clamping ring which surrounds the pin and the springs and which'is adjustable in the longitudinal direction of the pin.
  • the adjustability of the clamping ring in the longitudinal direction of the pin provides the advantage that the pretension in the springs and hence the percussion force can also be adjusted with it.
  • a favourable embodiment of the flash lamp unit according to the invention is characterized in that the springs which are destined to cooperate with two oppositely located flashlamps are coupled by a common connection part, the slots in the end face of the pin extending cross-wise.
  • the springs which are destined to cooperate with two oppositely located flashlamps are coupled by a common connection part, the slots in the end face of the pin extending cross-wise.
  • FIG. 1* shows the base plate, the springs and the clamping ring of a flash lamp unit having four flash lamps in the assembled condition
  • FIG. 2 shows one of the spring constellationsof FIG.
  • FIG. 3 shows the end face of the pin according to another embodiment of the flash lamp unit
  • FIG. 4 shows the spring constellations which are suitable for use in the embodiment shown in FIG. 3.
  • the base plate 1 of the flash lamp unit according to the invention shown in FIG. 1 four flash lamps 2 are arranged of which only one is shown.
  • the base plate comprises four recesses 3 in which a metal tube 4 fits which occurs on each of the percussion flash lamps.
  • An anvil and an ignition mass are arranged in said metal tube, said mass exploding by a percussion against the metal tube so that the ignition of the combustion material in the flash lamp is produced.
  • a pin 5 which extends transversely to the plane of the base plate is present on the center of the base plate 1.
  • two spring constellations 7 and 8 are secured.
  • each spring constellation is formed from two springs 9 and 10 manufactured from one piece of metal wire and coupled by a common connection part 11. This connection part is clamped in one of the slots 12 and 13 which occur in the end face of the free end 6 of the pin. In the embodiment shown in FIG. 1 said slots extend crosswise.
  • Each spring constellation comprises a common connection part 11, two parts 14 and 15 extending along the sides of the pin and two parts 16 and 17 extending parallel to the plane of the base plate. The parts 16 and 17 are destined to percuss against the metal tube of one of the percussion flash lamps.
  • said parts 16 and 17 are each locked in a pretensioned condition by a locking member 18 (see FIG. 1).
  • the unlocking of a spring is carried out by means of a percussion member connected to the shutter mechanism of a camera, which member penetrates into the flash lamp unit via one of the apertures 19 and lifts one of the parts 16 or 17 over the associated locking member 18.
  • the part 16 or 17 is moved in the direction of the arrow P by the spring action and percusses against the metal tube of the flash lamp.
  • the springs are clamped against the sidewall of the pin by a ring 20.
  • This ring is adjustable in the longitudinal direction of the pin so that the pretension in the springs is controllable.
  • the end face 21 of a pin shown in FIG. 3 and occurring in another embodiment of the flash lamp unit according to the invention comprises two slots 22 and 23 which have a curved shape.
  • the associated spring constellations 24 and 25, respectively, shown in FIG. 4 have common connection parts 26 and 27, respectively, the shapes of which correspond to the shapes of the slots 22 and 23.
  • the advantage of the spring constellations thus formed is that one type of spring constellation will suffice per flash lamp unit.
  • the connection of said spring constellations to the pins occurs preferably by means of a clamping ring.
  • connection part which each consist of two springs coupled by a common connection part
  • four separate springs may also be used which are each clamped in a slot in the end face of the pin by means of a connection part.
  • the connection of the springs or spring constellations in the slots may furthermore be a 4 clamping connection, in which the connection parts in the slots are locked by the inside of the screening cap which surrounds the flash lamps and whose edge is connected to the edge of the base plate.
  • a flash lamp unit for cooperation with an associated camera, said unit including a base plate and a striker carried thereon, said striker including at least one pair of radially extending arms disposed in a common plane, an upstanding elongated member having one end fixed to the axial extremity of each arm which is closest to the other arm of said pair, a connection member joining the other ends of said upstanding elongated members fixed to said pair of radially extending arms, and means for holding each of said elongated members in fixed relation with respect to said base plate, said means including an upstanding pin and means attaching said elongated members to said pin.
  • the apparatus as described in claim 2 further including at least one more slot disposed in said pin and at least one more striker carried in said slot.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Stroboscope Apparatuses (AREA)
  • Fastening Of Light Sources Or Lamp Holders (AREA)
US455225A 1973-04-24 1974-03-27 Flash lamp unit Expired - Lifetime US3918882A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7305669A NL7305669A (ja) 1973-04-24 1973-04-24

Publications (1)

Publication Number Publication Date
US3918882A true US3918882A (en) 1975-11-11

Family

ID=19818705

Family Applications (1)

Application Number Title Priority Date Filing Date
US455225A Expired - Lifetime US3918882A (en) 1973-04-24 1974-03-27 Flash lamp unit

Country Status (7)

Country Link
US (1) US3918882A (ja)
JP (1) JPS5014337A (ja)
CA (1) CA1005037A (ja)
DE (1) DE2417742A1 (ja)
FR (1) FR2227552B1 (ja)
GB (1) GB1414448A (ja)
NL (1) NL7305669A (ja)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4098565A (en) * 1974-06-17 1978-07-04 U.S. Philips Corporation Flashlamp unit
US4277234A (en) * 1976-06-28 1981-07-07 General Electric Company Percussive flashcube arrangement
US4278310A (en) * 1978-04-04 1981-07-14 Gte Products Corporation Method of making a percussively-ignited photoflash lamp

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3537805A (en) * 1968-10-14 1970-11-03 Sylvania Electric Prod Z-shape striker spring for percussionignitable,multilamp flash units
US3589849A (en) * 1969-08-14 1971-06-29 Eastman Kodak Co Dampening control device for percussive photoflash firing mechanism

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3537805A (en) * 1968-10-14 1970-11-03 Sylvania Electric Prod Z-shape striker spring for percussionignitable,multilamp flash units
US3589849A (en) * 1969-08-14 1971-06-29 Eastman Kodak Co Dampening control device for percussive photoflash firing mechanism

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4098565A (en) * 1974-06-17 1978-07-04 U.S. Philips Corporation Flashlamp unit
US4277234A (en) * 1976-06-28 1981-07-07 General Electric Company Percussive flashcube arrangement
US4278310A (en) * 1978-04-04 1981-07-14 Gte Products Corporation Method of making a percussively-ignited photoflash lamp

Also Published As

Publication number Publication date
DE2417742A1 (de) 1974-11-14
CA1005037A (en) 1977-02-08
JPS5014337A (ja) 1975-02-14
NL7305669A (ja) 1974-10-28
FR2227552A1 (ja) 1974-11-22
GB1414448A (en) 1975-11-19
FR2227552B1 (ja) 1977-10-21

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