US3325665A - Electric lamp - Google Patents

Electric lamp Download PDF

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Publication number
US3325665A
US3325665A US293009A US29300963A US3325665A US 3325665 A US3325665 A US 3325665A US 293009 A US293009 A US 293009A US 29300963 A US29300963 A US 29300963A US 3325665 A US3325665 A US 3325665A
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US
United States
Prior art keywords
lamp
filament
light
envelope
pinch
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
US293009A
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English (en)
Inventor
Meije Riksterus Auguste Maria
Verbeek Leo Henricus
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
North American Philips Co Inc
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 US3325665A publication Critical patent/US3325665A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/38—Seals for leading-in conductors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V19/00—Fastening of light sources or lamp holders
    • F21V19/0005—Fastening of light sources or lamp holders of sources having contact pins, wires or blades, e.g. pinch sealed lamp
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/26—Screens; Filters

Definitions

  • FIGA A first figure.
  • Our invention relates to an electric lamp and, in particular, to a lamp having an iodine containing gas filling and a filament wound entirely or partially into a helix and provided with one or more terminal members sealed in a base or pinch therein.
  • any tungsten of the filament which has vaporized and found its Way onto the wall of the bulb is returned to the filament which has two important advantages. First, there is comparatively little blackening of the bulb; and second, the filament is regenerated by the tungsten returned during operation of the lamp. Consequently, in lamps of this kind a filament of comparatively high power can be accommodated in a comparatively small bulb, While the life of the lamp can be made comparatively long.
  • the temperature distribution in such a lamp plays a decisive part in the production of a satisfactory iodine circulation. Especially, contact of the iodine with metals liable to be adversely affected by it should be avoided, since this may detract from the life of the lamp.
  • a principal object of our invention is to provide a lamp having a gas-filling containing iodine which is of simplified construction in which the metal parts are relatively resistant to the action of molecular iodine in various temperature ranges.
  • a further object of our invention is to provide a lamp of the aforesaid type in which the li ht distribution is such that only light from the central portion of the filament is transmitted through the envelope.
  • each of the ends of the filament extends in a base support or in the envelope pinch in which it is secured to a terminal member sealed therein.
  • the lamp is provided, at least in the proximity of the part of the filament adjacent a pinch, with means which in the operation of the lamp prevent that part of the filament from radiating light to the space surrounding the lamp, at least on part of the periphery of the lamp envelope extending at right angles to the lamp axis.
  • the end of the filament extends into the base or pinch and there is Secured to the terminal member sealed therein.
  • the metal parts required for a lamp having one filament comprise, in addition to this filament, only two terminal members sealed in the base and two external current supply wires so that a total of four joints are sufficient.
  • the fact that the filament extends into the base or pinch in some applications has the disadvantage that in the operation of the lam the filament radiates light throughout its entire length, that is to say from the boundary face of a pinch to the boundary face of a pinch. If such a lamp is to be used to produce a sharply defined beam, this phenomenon may be troublesom which is obviated by providim the lamp with the above mention d means which prevent light from being radiatel to certain tarts of the space surrounding the lamp.
  • the lamp envelope is rendered impermeabl to light at the portion in close proximity to the base.
  • the lamp is provided with screen which may be external to the envelope in 0105 proximity to the base for preventing the transmission 0 light through the portion of the envelope adjoining th pinch.
  • This screen may be external to the lamp.
  • i is of advantage to accommodate the screen, which pref erably is made of platinum, within the bulb. Platinum i capable of withstanding the action of atomic ant molecular iodine.
  • a tube-shape member generally results in that the portion of the fila ment surrounded by it is only slightly visible, so that th light which may be radiated by this portion is effectivelj screened by the tube-shaped member.
  • the tube shaped member is in contact with the portion of a fila ment it surrounds, the temperature of this portion of tilt filament falls to a temperature such that it emits substan tially no light.
  • the tube-shaped member may extent into the pinch almost up to the terminal member. It has been found that the likelihood of the pinch cracking is greatly reduced by this construction.
  • the lamp in accordance with the invention is partic' ularly advantageous when combined with a substantially parabolic reflector.
  • the lamp is arranged sc that its filament, which is at least partially Wound intc a helix and extends in a straight line, extends along 01 parallel to the axis of the reflector in the reflector space. while a portion of the filament coincides with or is adjacent to the focus of the reflector.
  • the lamp is further disposed so that the portion of the filament situated between the apex and the focus of the reflector is provided with means which prevent this portion from radiating light to the space surrounding the lamp, at least over that portion of the lamp envelope extending at right angles to the lamp axis.
  • FIG. 1 shows one embodiment in section of the lam; in accordance with the invention
  • FIGS. 2 and 3 show a second embodiment of the 1am; in accordance with the invention, FIG. 3 being a cross sectional view of the lamp taken through the plane III-- III of FIG. 2;
  • FIGS. 4 and 5 show a third embodiment of the lam; in accordance with the invention, FIG. 5 being a cross sectional view of the lamp taken through the plane Vv of FIG. 4;
  • FIG. 6 shows a combination of a parabolic reflector and the lamp of FIG. 2.
  • the lamp shown in FIG. 1 has a tubular envelope 1 which at both ends terminate in flat pinches 2 and 3, respectively, in which the ends of the filament 4 are sealed
  • Filament 4 comprises a central helically wound portior 4a the ends of which terminate in straight portions 4L and 4c.
  • the portions 4b and 40 project through boundary faces 5 and 6 of the envelope 1 so as to be partly disposed in the pinches 2 and 3 respectively.
  • These filament portions are each secured to a terminal member in the form oi ires 7 and 8, respectively, of greater diameter.
  • the wires 7 and S are joined to nickel currentlpply wires 9 and 10 respectively.
  • Bulb 1 is provided with.
  • the bulb contains a filling gas, e.g. kryp- I11 and iodine in the free or combined state in an amount: ich that when the lamp is operated, so-called iodine cirnation is produced in the bulb. As has been menoned hereinbefore, this reduces blackening of the bulb ad has a regenerating effect on the filament.
  • a filling gas e.g. kryp- I11 and iodine in the free or combined state in an amount: ich that when the lamp is operated, so-called iodine cirnation is produced in the bulb. As has been menoned hereinbefore, this reduces blackening of the bulb ad has a regenerating effect on the filament.
  • filament 4 extends from terminal member 7 to :rminal member 8 a very simple lamp construction is. btained. In certain cases it may be considered a disdvantage that in the operation of the lamp not only 1e helically wound portion 4a of the filament 4 but also s ends 4! and 4c, insofar as they lie Within the boundary ices 5 and 6 of the bulb 1, emit light. In the lamp shown. 1 FIG. 1 this disadvantage is obviated by providing each.
  • FIGS. 2 and 3 another onstruction for preventing the radiation of undesired ight is used.
  • a slightly curved screen 24 of platinum .rranged in the bulb space 25 is secured by means of a bin platinum wire 23 to a terminal member 21 which is. ncorporated in the left-hand pinch 22 and has the shape: if a foil of molybdenum.
  • the screen extends longitudinally hrough a distance which is about equal to the length if the straight portion 26b of a filament 26 extending in be space 25.
  • the construction of the lamp .hoWn in FIG. 2 is similar to that of the lamp shown in FIG. 1.
  • the terminal members 21 and 27 have he form of foils, and that only one of the straight ends )f the filament 26 is screened.
  • the screen 24 xtends at right angles to the longitudinal axis of the lamp and through an angle a with respect to the peripheral firection of the lamp. Consequently, if FIG. 2 shows the operating position of the lamp, the straight filament and 26b will only be prevented from radiating light into the space surrounding the lamp in the upward direction through the angle a.
  • FIG. 4 uses a filament which is helically wound and has a portion 40a which is intended for the emission of light and is shaped substantially in the form of a V.
  • the straight filament ends 4617 and 400 extend into a common pinch 41. In this pinch they are secured to terminal members 42 and 43 in the form of pieces of thicker molybdenum wire to which current-supply wires 44 and 45 of nickel are secured.
  • Bulb 46 is provided with a sealed-01f exhaust tube 47.
  • sheath-shaped members 48 and 49 which each comprise a helically wound tungsten wire. These members surround the straight filament ends 4% and 400 with a small amount of clearance. Any light emitted by the straight filament ends 4% and 4110 is rendered invisible by these sheath-shaped members so that only the helical portion 40a of the filament radiates light.
  • the bulb of this lamp is made of hard glass. The fact that the sheath-shaped members extend into the pinch 41 provides the additional advantage that in the operation of the lamp the hard-glass pinch is less likely to crack than if the straight filament ends 40b and 400 were directly sealed in the hard glass.
  • FIGURE 6 shows diagrammatically a substantially parabolic reflector 61, the optical axis of which is designated X-X.
  • this reflector has an aperture 62 for the introduction of a source of light.
  • a plate-shaped holder 63 on which a lamp 66 of the type shown in FIG. 2 is mounted by means of rigid current-supply wires 64 and 65, fits within this aperture.
  • the longitudinal axis of a filament 67 coincides with the optical axis X-X of the reflector 61.
  • the focus F of the reflector lies in this axis X-X.
  • the filament 67 is preferably arranged so with respect to the focus F that the rearmost turn of the helical portion 67a of this filament coincides with the focus F. If now the straight end 6711 of the filament 6-7, which end is near the apex of the reflector, is screened upwardly by a screen 68 arranged in the lamp 66, it is ensured that the upper half of the reflector 61 produces no light ray which is at an upwardly directed angle to the reflector axis X-X.
  • the lower half of the reflector can produce upwardly directed light rays. If this is troublesome, it may be obviated, for example, by shifting the focus of the lower half of the reflector towards the aperture thereof with respect to F.
  • a source of illumination comprising a light-transmissible envelope filled with an iodine-containing gas, an helically-wound filament provided with straight end portions and adapted to glow upon the passage of an electrical current therethrough and positioned within said envelope, a base support within said envelope into which at least one straight end portion of said filament extends, a terminal member sealed within said base support to which the end of said filament is connected, and a relatively light-impervious screen member constituted of platinum and positioned to intercept light only radiated by said straight end portion of said filament extending into said base support.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
US293009A 1962-07-06 1963-07-05 Electric lamp Expired - Lifetime US3325665A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL62280649A NL142017B (nl) 1962-07-06 1962-07-06 Elektrische gasgevulde jodiumgloeilamp.

Publications (1)

Publication Number Publication Date
US3325665A true US3325665A (en) 1967-06-13

Family

ID=19753956

Family Applications (1)

Application Number Title Priority Date Filing Date
US293009A Expired - Lifetime US3325665A (en) 1962-07-06 1963-07-05 Electric lamp

Country Status (10)

Country Link
US (1) US3325665A (xx)
AT (1) AT238312B (xx)
BE (1) BE634513A (xx)
CH (1) CH427997A (xx)
DE (1) DE1489407B2 (xx)
DK (1) DK108367C (xx)
ES (1) ES289617A1 (xx)
FR (1) FR1362289A (xx)
GB (1) GB1023137A (xx)
NL (2) NL142017B (xx)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3555338A (en) * 1967-03-10 1971-01-12 Sylvania Electric Prod Incandescent lamp
US3622832A (en) * 1967-01-24 1971-11-23 Airequipt Inc Interchangeable tungsten halogen lamp
JPS4740702Y1 (xx) * 1968-11-06 1972-12-08
US3727091A (en) * 1971-05-11 1973-04-10 Westinghouse Electric Corp Halogen-cycle incandescent lamp having a platinized interior fuse
US3936686A (en) * 1973-05-07 1976-02-03 Moore Donald W Reflector lamp cooling and containing assemblies
US4081708A (en) * 1975-06-18 1978-03-28 U.S. Philips Corporation Incandescent lamp-reflector unit

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5124145Y1 (xx) * 1970-08-10 1976-06-21
GB8429740D0 (en) * 1984-11-24 1985-01-03 Emi Plc Thorn Lead wires in pinch seals
EP0367323B1 (en) * 1988-10-18 1994-07-27 Koninklijke Philips Electronics N.V. Lamp/reflector unit

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB189610284A (en) * 1896-05-14 1897-04-17 George William Pridmore A New and Improved Reflector in connection with Glass Bulbs or Glow Lamps for Electrical Lighting.
US1409469A (en) * 1917-09-22 1922-03-14 Frank A Reece Automobile headlight
US1445398A (en) * 1921-04-29 1923-02-13 Kambayashi Kazuo Incandescent electric lamp
US1807140A (en) * 1928-03-07 1931-05-26 Electrons Inc Discharge tube
US2006839A (en) * 1932-11-21 1935-07-02 Siemens Ag Headlight for vehicles
US3132278A (en) * 1961-09-18 1964-05-05 Gen Electric Iodine cycle incandescent lamps

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB189610284A (en) * 1896-05-14 1897-04-17 George William Pridmore A New and Improved Reflector in connection with Glass Bulbs or Glow Lamps for Electrical Lighting.
US1409469A (en) * 1917-09-22 1922-03-14 Frank A Reece Automobile headlight
US1445398A (en) * 1921-04-29 1923-02-13 Kambayashi Kazuo Incandescent electric lamp
US1807140A (en) * 1928-03-07 1931-05-26 Electrons Inc Discharge tube
US2006839A (en) * 1932-11-21 1935-07-02 Siemens Ag Headlight for vehicles
US3132278A (en) * 1961-09-18 1964-05-05 Gen Electric Iodine cycle incandescent lamps

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3622832A (en) * 1967-01-24 1971-11-23 Airequipt Inc Interchangeable tungsten halogen lamp
US3555338A (en) * 1967-03-10 1971-01-12 Sylvania Electric Prod Incandescent lamp
JPS4740702Y1 (xx) * 1968-11-06 1972-12-08
US3727091A (en) * 1971-05-11 1973-04-10 Westinghouse Electric Corp Halogen-cycle incandescent lamp having a platinized interior fuse
US3936686A (en) * 1973-05-07 1976-02-03 Moore Donald W Reflector lamp cooling and containing assemblies
US4081708A (en) * 1975-06-18 1978-03-28 U.S. Philips Corporation Incandescent lamp-reflector unit

Also Published As

Publication number Publication date
BE634513A (xx)
AT238312B (de) 1965-02-10
CH427997A (de) 1967-01-15
GB1023137A (en) 1966-03-23
NL142017B (nl) 1974-04-16
NL280649A (xx)
FR1362289A (fr) 1964-05-29
DK108367C (da) 1967-11-27
DE1489407A1 (de) 1969-03-06
DE1489407B2 (de) 1971-12-16
ES289617A1 (es) 1963-08-16

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