US3774020A - Flash bulb unit - Google Patents

Flash bulb unit Download PDF

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Publication number
US3774020A
US3774020A US00194959A US3774020DA US3774020A US 3774020 A US3774020 A US 3774020A US 00194959 A US00194959 A US 00194959A US 3774020D A US3774020D A US 3774020DA US 3774020 A US3774020 A US 3774020A
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US
United States
Prior art keywords
bulbs
support
flash
bulb
unit
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
US00194959A
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English (en)
Inventor
A Heeman
F Abels
A Kraan
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US Philips Corp
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US Philips Corp
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Filing date
Publication date
Application filed by US Philips Corp filed Critical US Philips Corp
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Publication of US3774020A publication Critical patent/US3774020A/en
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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
    • G03B15/0442—Constructional details of the flash apparatus; Arrangement of lamps, reflectors, or the like

Definitions

  • the invention relates to a flash bulb unit comprising a number of combustion flash bulbs which can be ignited by the short-lasting application of a high voltage, said flash bulbs being arranged on a common elongate support, the said flash bulb unit furthermore comprising reflectors which cooperate with the bulbs.
  • a flash bulb unit comprising a number of combustion flash bulbs which can be ignited by the short-lasting application of a high voltage, said flash bulbs being arranged on a common elongate support, the said flash bulb unit furthermore comprising reflectors which cooperate with the bulbs.
  • Such a unit is particularly suitable for the ignition without the use of a battery of a number of combustion flash bulbs and is described in the Dutch published Pat. application No. 6,613,816.
  • the lamps which are connected electrically in parallel are arranged in a single row on a common support.
  • the unit according to the invention is characterized in that at least a part of the bulbs which have a longitudinal dimension which is from 3 to times larger than the inner diameter and at least a part of the reflectors are secured in the support in two parallel rows, the directions of reflection of the two rows of reflectors being opposite to each other and oriented opposite to each other.
  • so-called needleshaped high-voltage flash bulbs are used which are arranged in parallel rows parallel to each other.
  • the flash bulb unit is preferably formed so that the two rows of reflectors are formed by members of a reflecting material which are arranged back-to-back and are closely surrounded by an envelope of a synthetic resin which is transparent at the area of the reflectors and is secured to the support with the reflectors incorporated therein.
  • the flash bulb unit as a flat flash bulb set which, when not in use, can easily be packed away in a coat pocket as a substantial box. When all the bulbs have been fired, said set is thrown away.
  • An even flatter unit can be obtained when an embodiment is used which is characterized in that, calculated in the longitudinal direction of the support, a reflector of one reflecting member is present beside a reflector of the other reflecting member.
  • a reflector of one reflecting member is present beside a reflector of the other reflecting member.
  • a form of a reflector having a parabolic cross-section in the focus of which the bulb is arranged can no longer be used. This would result in the flash bulb set having a smaller number of flash bulbs or, if each bulb would be arranged outside the focus of its reflector, in an insufficient light reflection.
  • each reflector is constructed from at least three elongate continuous flat parts extending parallel to the bulb axis, the central one of said parts extending behind the bulb in the longitudinal direction of the support and the outermost parts assuming a position in which they are bent towards each other in the direction of the bulb.
  • each needle-shaped bulb in the flash bulb unit according to the invention is secured in the support of the unit. Also due to the length of the bulb it is recommendable to also fix the head of the lamp in an unambiguous manner relative to the reflector.
  • the envelope of synthetic resin comprises a number of cavities in which the tips of the bulbs bear.
  • the flash bulb unit according to the invention may be used for high-voltage flash bulbs which are suitably connected electically with the interposition of a number of switching elements in such manner that they can be fired one after the other by the short-lasting application of a high voltage. Such lamps may then be arranged, for example, in series.
  • the invention may be applied in particular to a flash bulb unit in which the bulbs are connected electrically in parallel in a manner as is described in the above-mentioned Dutch published Pat. application No. 6,613,816. With this arrangement it is ensured, without the addition of separate switching elements, that the lamps are fired one after the other.
  • An embodiment of the flash bulb unit according to the invention having such-fusing strips is characterized in that the fusing strip is arranged on the outside of the bulb, the strips for a row of bulbs being each connected with their one end to one of the pole wires and being connected with their other end to the central conductOI'.
  • the invention furthermore provides an embodiment which is characterized in that the central conductor is formed by two electric metal combs which are incorporated with their backs in the support and bear against the fusing strip with their teeth which are formed as resilient lugs and which deform elastically.
  • the combs with the resilient lugs present the possibility of connecting the fusing strips to the central conductor by a clamping connection only. It is not necessary to use conventional connection methods in which a thermal treatment, soldering or the like, is required.
  • pole wires of each bulb On of the pole wires of each bulb is preferably bent back in such manner as to bear against one of the ends of the fusing strip while deforming elastically. If desirable, other pole wires with the other conductors in the support may also be formed as clamping connections.
  • FIG. 1 is a perspective view of the unit having ten flash bulbs
  • FIG. 2 shows, as a partly exploded view, the components of the unit
  • FIG. 3 shows the support of the unit having a central conductor in the form of a comb and an outermost conductor having a series of five flash bulbs.
  • FIG. 4 is a cross-sectional view of the unit taken on the line IV-IV of FIG. 5.
  • FIG. 5 is a sectional view taken on the line VV of 30 6,613,816). Furthermore, said flash bulbs are needleshaped, the length being from 4 to times as large as the inside diameter of the envelope. The bulbs of each row 3,4 cooperate with reflector members 5 and 6, respectively. The support 2 with the components provided thereon are surrounded by a box-shaped transparent envelope 7 of a synthetic resin.
  • FIG. 2 shows the support 2 with the rows of bulbs 3, 4.
  • the envelope 7 of synthetic resin with the reflector members 5,6 is shown detached from the support.
  • the support 2 comprises four electric conductors which extend beside each other in the longitudinal direction of the support 2.
  • the central conductors are in the form of combs having a plurality of bent resilient lugs 8.
  • the central conductors are electrically connected in the bottom 23 of the support 2.
  • FIG. 3 shows the support 2 having four slots 9, 10, 11, 12 extending in the longitudinal direction.
  • the central slots 10 and 1 I serve to receive electric conductors l3 and 14, respectively, comprising the lugs 8.
  • the lugs 8 of the conductor 13 in slot 10 cooperate with the row of flash bulbs 4, which row in the assembled condition is present above the slots 11 and 12.
  • the lugs of the conductor 14 in slot 11 cooperated with the bulbs 3 of the row which is present above the slots 9 and 10.
  • Two series of cams 16 and 17 are provided on the part of the support 2 present between the slots 10 and 11. Each of said cams screens the bulb cooperating therewith from the adjacent bulbs of the other row. Searching cams and 21, respectively, are
  • the electric conductor 14 having five lugs 8 is shown in a position detached from the support 2.
  • the projection 22 can be threaded through an aperture in the support 2 and contact the metal plate incorporated in the bottom 23.
  • FIG. 3 furthermore shows the series of bulbs 3.
  • said bulbs are each provided with two pole wires 24 and 25.
  • the pole wires 24 are connected together by a conductor 26.
  • the end of each of the pole wires 24 is bent around the conductor 26 formed from soft copper.
  • a contact member not shown which is incorporated in an aperture passing through the bottom 23 of the support 2 and which debouches beside the metal plate.
  • Each of the pole wires is clamped in a resilient manner against a fusing strip 27 which is arranged against the wall of the bulb envelope. In the assembled condition one of the lugs 8 of the conductor 14 is secured against the part 28 of the fusing strip 27 in a clamping manner.
  • the fusing strip is manufactured from a lead-tin alloy having a melting point of 180 C.
  • the strip will blow so that the electric contact between the pole wire 25 and the resilient lug 8 of the conductor 14 is interrupted, as is described in detail in Dutch Pat. application No. 6,908,333f
  • the bulbs are connected to the conductor 26 in such manner that the tips 29 of the bulbs are situated on a straight line and the conductor extends at a prescribed distance from said line.
  • These aligned tips 29 fit in cavities 30 (see FIG. 4) present on .the inside of the envelope 7 in the surface 31.
  • the cavities 30 are conical.
  • the edge 18 of the support 2 comprises the stud 20.
  • the cams 21 occurring on the edge 19 are not shown in this Figure to avoid complexity of said Figure.
  • the metal plate 32 is secured in the bottom 23 of the support 2 by means of a screw 33.
  • the support furthermore comprises the slots 9,10,11 and 12.
  • the outermost slots 9 and 12 show widenings 34 at the area of the cams 20 and 21, respectively, for receiving the pole wires 24.
  • Cams 17 are provided on the part 15 of the support 2.
  • the conductor 14 is incorporated in the slot 11 of which conductor the resilient lug 8 bent several times forms part.
  • the projection 22 of the conductor 14 projects through the aperture 34 recessed in the support.
  • the end 35 of the projection 22 is bent and clamped between the metal plate 32 and the bottom 23.
  • the pole wire 24 of the flash bulb 3 is bent around the electric conductor 26 accommodated in the slot 9.
  • This conductor is connected in a clamping manner to the contact member 43 which is accommodated in an aperture 36 recessed in the support 2, and which debouches in the bottom 22 beside and electrically insulated from the plate 32.
  • the fusing strip 27 is secured against the outer wall of the bulb envelope.
  • This fusing strip couples the pole wire 25 which is clamped against the lower part 37 of the fusing strip 27 and the lug 8 of the conductor 14, which lug is clamped against the upper part 28 of the fusing strip.
  • Shown in this Figure are furthermore the electrical conductors 13 and 44, respectively, incorporated in slots and 12, respectively.
  • the bulbs of the row 4 not shown in FIG. 4 are also connected to the plate 32 by means of a pole wire, a fusing strip and the conductor 13.
  • the other pole wire of the bulbs of row 4 is connected, by means of the con ductor 44, to a contact member which is located opposite to the contact member 43 diametrically relative to the center of the plate 32 and debouches in the bottom 23 of the support 2.
  • the two identical reflector members 5 and 6 are each constructed from 5 reflectors.
  • each reflector is constructed from 5 surfaces extending parallel to the longitudinal axis of the flash bulb to be incorporated in said reflector.
  • the surface 38 which forms part of the reflector member 5 is arranged back-to-back against the surfaces 39 which forms part of the reflector member 6.
  • the outermost surfaces 40 are provided at their ends with the inclined surfaces 41 increasing the luminous efficiency (see also FIG. 2).
  • the projections 42 ensure a clamping fit of the reflector members 5 and 6 in the transparent envelope 7.
  • the reflector members are manufactured by means of injection moulding from a transparent synthetic resin, the reflecting layer being provided by means of vapour deposition.
  • the assembly of the components is carried out as follows:
  • the elongate flash bulb is provided, with a fusing strip, for example, by means of an adhesive, or by locally liquiefying a layer of lacquer present on the wall of the envelope, and then pressing wall.
  • a series of five flash bulbs extending mutually in parallel is then placed in a holder in such manner that the tips 29 of the bulbs are in alignment.
  • the pole wires 24 are then bent around the conductor 26, said conductor extending parallel to the striaght line on which the tips of the lamps are located.
  • the pole wires 25 are bent against the parts 28 of the fusing strips 27.
  • the conductors 13 and 14 are arranged in the slots 10 and 11 of the support and locked by means of the metal plate 32.
  • the conductors 26, 44 with the rows of the strip against the bulbs 3 and 4 secured thereto are then laid in the slots 9 and 12.
  • the envelope of synthetic resin with the reflector members 5 and 6 arranged therein is finally slid over the bulbs.
  • the searching cavities 30 present in the bottom of the envelope 7 encloses the tips 29 of the bulbs in such manner that the bulbs do not touch the walls of the reflector or the envelope.
  • the unit may also be constructed with a number of flash bulbs differing from 10.
  • the conductors may project beyond the unit on the short side of the support, the support comprising two series of flash bulbs on its two flat sides.
  • a cross-section of the unit taken parallel to the plane of the support 2 may also take the form of a parallelogram when the short side of the envelope extends parallel to the side wall of the outer most reflectors and projections 42 are lacking as is denoted in FIG. 5 by the dot-and-dash line.
  • a flash bulb unit comprising: a plurality of combustion flash bulbs adapted to being ignited by the short-lasting application of a high voltage, the flash bulbs being arranged on a common elongate support, the flash bulb unit also including reflectors being secured in the support in two parallel rows, the directions of reflection of the two rows of reflectors being opposite to each other, and said reflectors being oriented opposite to each other, each row of bulbs also being connected electrically in parallel, and wherein the support is formed as an elongate support which comprises at least three juxtaposed electrical conductors extending in the longitudinal direction of the support, each of the two outermost conductors being connected to one of the pole wires of each bulb of the same row and the central conductor being connected to the remaining pole wires of the bulbs of both rows, a part of the three conductors projecting beyond the unit, and in which a fusing strip is incorporated inthe current path of one of the pole wires, which strip blows as a result of the thermal energy released during the firing of the lamp and wherein the

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fastening Of Light Sources Or Lamp Holders (AREA)
US00194959A 1970-11-06 1971-11-02 Flash bulb unit Expired - Lifetime US3774020A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7016259A NL7016259A (da) 1970-11-06 1970-11-06

Publications (1)

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US3774020A true US3774020A (en) 1973-11-20

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Application Number Title Priority Date Filing Date
US00194959A Expired - Lifetime US3774020A (en) 1970-11-06 1971-11-02 Flash bulb unit

Country Status (9)

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US (1) US3774020A (da)
AT (1) AT319039B (da)
CA (1) CA964248A (da)
DE (1) DE2154795A1 (da)
FR (1) FR2113628A5 (da)
GB (1) GB1344652A (da)
IT (1) IT940446B (da)
NL (1) NL7016259A (da)
SE (1) SE372086B (da)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4032769A (en) * 1975-08-21 1977-06-28 Gte Sylvania Incorporated Photoflash lamp array with web hinge
US4053757A (en) * 1974-09-30 1977-10-11 General Electric Company Photoflash lamp array having radiation switches and flash indicators
US4371913A (en) * 1980-12-18 1983-02-01 Gte Products Corporation Reflector lamp module for photoflash array
US4385888A (en) * 1981-03-27 1983-05-31 Gte Products Corporation Vacuum-formed housing array

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1216696A (en) * 1915-04-26 1917-02-20 Iconochrome Company Of America Inc Photographic lighting.
US3459933A (en) * 1965-11-30 1969-08-05 Philips Corp Flash lamp holder for use with a camera
US3500732A (en) * 1966-06-24 1970-03-17 Louis Marius Nijland Apparatus for sequentially igniting flash lamps
US3545904A (en) * 1968-10-03 1970-12-08 Polaroid Corp Apparatus for sequentially selecting photoflash lamps for ignition
US3583304A (en) * 1968-09-16 1971-06-08 Polaroid Corp Photographic camera
US3598985A (en) * 1968-12-16 1971-08-10 Gen Electric Construction of disposable photoflash lamp array
US3619590A (en) * 1968-04-04 1971-11-09 Philips Corp Flashlamp holder

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1216696A (en) * 1915-04-26 1917-02-20 Iconochrome Company Of America Inc Photographic lighting.
US3459933A (en) * 1965-11-30 1969-08-05 Philips Corp Flash lamp holder for use with a camera
US3500732A (en) * 1966-06-24 1970-03-17 Louis Marius Nijland Apparatus for sequentially igniting flash lamps
US3619590A (en) * 1968-04-04 1971-11-09 Philips Corp Flashlamp holder
US3583304A (en) * 1968-09-16 1971-06-08 Polaroid Corp Photographic camera
US3545904A (en) * 1968-10-03 1970-12-08 Polaroid Corp Apparatus for sequentially selecting photoflash lamps for ignition
US3598985A (en) * 1968-12-16 1971-08-10 Gen Electric Construction of disposable photoflash lamp array

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4053757A (en) * 1974-09-30 1977-10-11 General Electric Company Photoflash lamp array having radiation switches and flash indicators
US4032769A (en) * 1975-08-21 1977-06-28 Gte Sylvania Incorporated Photoflash lamp array with web hinge
US4371913A (en) * 1980-12-18 1983-02-01 Gte Products Corporation Reflector lamp module for photoflash array
US4385888A (en) * 1981-03-27 1983-05-31 Gte Products Corporation Vacuum-formed housing array

Also Published As

Publication number Publication date
FR2113628A5 (da) 1972-06-23
IT940446B (it) 1973-02-10
GB1344652A (en) 1974-01-23
AT319039B (de) 1974-11-25
CA964248A (en) 1975-03-11
DE2154795A1 (de) 1972-05-10
SE372086B (da) 1974-12-09
NL7016259A (da) 1972-05-09

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