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US3646386A - Halogen filament lamp for vehicle headlight with screen partially surrounding antiglare filament - Google Patents

Halogen filament lamp for vehicle headlight with screen partially surrounding antiglare filament Download PDF

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Publication number
US3646386A
US3646386A US831358A US3646386DA US3646386A US 3646386 A US3646386 A US 3646386A US 831358 A US831358 A US 831358A US 3646386D A US3646386D A US 3646386DA US 3646386 A US3646386 A US 3646386A
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US
United States
Prior art keywords
filament
antiglare
screen
lamp
bulb
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
US831358A
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English (en)
Inventor
Johannes Rijnders
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 US3646386A publication Critical patent/US3646386A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K9/00—Lamps having two or more incandescent bodies separately heated
    • H01K9/08—Lamps having two or more incandescent bodies separately heated to provide selectively different light effects, e.g. for automobile headlamp

Definitions

  • ABSTRACT A halogen filament lamp for vehicle headlights in which a screen partially surrounds the antiglare filament within the lamp bulb to prevent blinding of a driver of an oncoming car. This screen has a reflecting surface that both blocks certain light rays and reflects same to the parabolic reflector.
  • a halogen filament lamp for a vehicle headlight lamp comprising a tubular lamp vessel having a driving-light filament and an antiglare filament.
  • the antiglare filament is arranged with its longitudinal axis in the longitudinal direction of the lamp vessel but eccentric with respect to the lamp axis. Viewed in a plane at right angles to the longitudinal axis, the lamp vessel is surrounded by a light intercepting screen which extends in the axial direction of the lamp over an angle of 165 to 180.
  • Such a halogen filament lamp is known and is disposed in a parabolic headlight reflector in such manner that the lamp axis coincides substantially with the axis of the reflector.
  • the screen ensures that the light from the antiglare filament impinges only upon that reflector half so that, assuming that the reflector axis is arranged horizontally, it is directed downwards and thus will not blind the driver of an oncoming car.
  • halogen lamps As compared with nonhalogen filament lamps, halogen lamps have the advantage of a considerably larger luminous efficiency with a given absorbed power and a given life. As a result of the higher luminous efficiency of halogen filament lamps, it becomes important that the antiglare light should be nonblinding, and it is highly desirable to obtain a prescribed sharp cutting-off of the antiglare beam.
  • the antiglare filament is therefore arranged with its longitudinal axis parallel to but eccentrical with respect to the axis of the envelope and at a distance from the axis of the envelope which is at least equal to half the diameter of said filament.
  • the screen is constituted as a lightabsorbing thin layer of paint on a part of the outside of the envelope of the lamp.
  • the screen may be a separate structural component which engages the relative part of the outer wall.
  • the halogen filament lamp according to the invention has on its side facing the antiglare filament a screen comprising a direct reflecting surface that has one part positioned between the antiglare filament and the wall of the tubular part of the lamp vessel, and another part extending between the two filaments.
  • the part of the screen situated between the end faces of the two filaments facing each other extends at right angles to the lamp axis and has a shape such that rays from the antiglare filament reflected by said part of the screen, are reflected at an angle of at most 60 with the lamps axis in a direction remote from the driving-light filament; the remaining part of the screen has a shape such that rays from the antiglare filament reflected by said remaining part of the screen do not pass a region situated concentrically inside the tubular lamp vessel and which is situated between the end faces and has a radius of maximally 2.5x the diameter of the antiglare filament. A large part of the light from the antiglare filament intercepted by the screen is reflected and received on the upper half of the reflector.
  • the light rays from the antiglare filament which impinge upon the upper half of the reflector of the above mentioned headlight do not cause blinding.
  • the focus of the reflector is situated in or in the immediate proximity of the region bounded between the end faces. It has been found experimentally that for the rays reflected by the part of the screen present between the adjacent end faces of the two filaments, the angle in question with the lamp axis should not exceed 60".
  • an antiglare cap in the lamp vessel, said cap comprising a cup-shaped dull blackened part extending from a place between the filament which part adjoins a more or less cylindrical curved readily reflecting mirror part which partly surrounds the antiglare filament.
  • said dull blackened part results in only weak reflection which, is hardly annoying.
  • the use of such a dull blackened layer on the screen in a halogen filament lamp with much larger brightness is hardly possible on the one hand already due to the chemical action of the filling gas.
  • a preferred embodiment of the halogen filament lamp according to the invention is characterized in that the screen comprises a segment of a hollow cylinder which surrounds the antiglare filament over preferably half its length remote from the driving-light filament; the axis'of the envelope is situated between the cylinder axis and the longitudinal axis of the antiglare filament and parallel to said axes, a curved part of the screen extends between the two filaments adjoining said cylinder segment, the centers of curvature of the radius or raddi of curvature of said part being situated on the axis of the cylindrical part.
  • FIG. 1 shows a parabolic automobile headlight reflector with halogen filament lamp arranged therein according to the invention.
  • FIG. 2 is a cross-sectional view taken on the line Il-II of 1 FIG. 1.
  • FIG. 3 serves to illustrate the effect of the directed reflecting screen.
  • reference numeral 1 denotes the tubular part of the halogen filament lamp which cooperates with a parabolic reflector 3 as an automobile headlight.
  • the focus is denoted by F.
  • a driving-light (main) filament 5 and an antiglare auxiliary filament 7 are eccentrically arranged in the lamp in the conventional manner.
  • the screen antiglare 9 is formed as a cap which surrounds the antiglare filament 7 (see also FIG. 2) over an angle of to On the side facing the antiglare filament 7, the cap shows a direct reflecting mirror surface which reflects the antiglare light for a considerable part to the upper reflector part 15, and thus contributes to an antiglare light beam having a light intensity which is greater than would be obtained with a screen which is absorbing, for example, dull black, throughout its inner surface.
  • the screen 9 comprises three adjoining parts b, c and d, each having a particular shape.
  • the part b is shaped as a segment of a hollow cylinder, the axis 13 of which extends parallel to the axis 17 of the envelope.
  • Two other parts c and d adjoin part b and together constitute a spherical segment, the radius of which has a center which is situated just on the right of the center M of the antiglare filament 7 on the axis 13.
  • Reference numeral 19 in F IG. 3 denotes the most unfavorable light ray. Due to the shape of the part b, the reflected ray 20 crosses the antiglare filament 7 and does not pass the region a where the focus F is situated. This ray 20, after reflection on the reflector part 15, will be directed downwards, and hence produce no glare to the driver of an oncoming car.
  • Reference numeral 21 denotes another unfavorable light ray which is reflected by the part c of the screen and crosses the antiglare filament in a direction according to the ray 23, and is also directed downwards after reflection on the part 15 of the reflector.
  • Reference numeral 25 denotes still another unfavorable light ray which is reflected by the part d of the screen in a direction denoted by 27 according to an angle of 60 with the axis 13 of the screen 9.
  • a halogen filament lamp including a. a tubular bulb having a central, longitudinal axis, and which when orientated horizontally has upper, lower front and rear parts,
  • an antiglare filament axially spaced and secured in the rear and front parts respectively of the bulb, the antiglare filament having a central longitudinal axis disposed generally parallel to and below the axis of the bulb, and a screen comprising (i) a first part formed as segment of a cylindrical tube having a central axis generally parallel to that of the bulb and corresponding front and rear parts, the screen at least partially surrounding the lower and front parts of the antiglare filament as viewed in front elevation view, extending upward on both sides defining an arc of from and (ii) a second part formed as a segment of a sphere extending from the rear of the first screen part into the region between the two filaments, the surface of the screen facing the antiglare filament being direct reflecting thereby blocking light from the antiglare filament from reaching at least portions of said region, with at least some of said blocked rays being reflective off said surface.

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  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
US831358A 1968-06-08 1969-06-09 Halogen filament lamp for vehicle headlight with screen partially surrounding antiglare filament Expired - Lifetime US3646386A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL686808109A NL154058B (nl) 1968-06-08 1968-06-08 Halogeengloeilamp voor voertuigverlichting.

Publications (1)

Publication Number Publication Date
US3646386A true US3646386A (en) 1972-02-29

Family

ID=19803853

Family Applications (1)

Application Number Title Priority Date Filing Date
US831358A Expired - Lifetime US3646386A (en) 1968-06-08 1969-06-09 Halogen filament lamp for vehicle headlight with screen partially surrounding antiglare filament

Country Status (8)

Country Link
US (1) US3646386A (xx)
AT (1) AT295655B (xx)
BE (1) BE734187A (xx)
ES (1) ES167983Y (xx)
FR (1) FR2010436A1 (xx)
GB (1) GB1232136A (xx)
NL (1) NL154058B (xx)
SE (1) SE347842B (xx)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3736452A (en) * 1970-09-30 1973-05-29 Philips Corp Halogen motorcar lamp
US3968395A (en) * 1972-09-25 1976-07-06 Siemens Aktiengesellschaft Two filament electric bulb traffic light
US4302698A (en) * 1978-09-22 1981-11-24 Patent-Treuhand-Gesellschaft Fur Elektrische Gluhlampen M.B.H. Dual-filament halogen incandescent lamp, particularly sealed-beam, automotive headlight
FR2498297A1 (fr) * 1981-01-16 1982-07-23 Cibie Projecteurs Perfectionnements aux projecteurs de croisement
US5357407A (en) * 1993-05-10 1994-10-18 Woods Michael E Light attenuator for high/low beam vehicle headlight bulb
US5578893A (en) * 1993-11-16 1996-11-26 Piaa Corporation Bulb for vehicular lighting equipment
WO1998049716A1 (en) * 1997-04-28 1998-11-05 Osram Sylvania Inc. Vehicle lamps with glare control
US6281630B1 (en) 1997-04-28 2001-08-28 Osram Sylvania, Inc. Vehicle lamps with glare control
WO2015036300A1 (en) * 2013-09-13 2015-03-19 Koninklijke Philips N.V. Vibration resistant automotive front lighting lamp
US20160217996A1 (en) * 2013-10-09 2016-07-28 Koninklijke Philips N.V. Vibration resistant automotive front lighting lamp

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2071979A (en) * 1933-08-17 1937-02-23 Gen Electric Electric incandescent lamp
US2617062A (en) * 1949-04-13 1952-11-04 Hartford Nat Bank & Trust Co Electric incandescent lamp
US3200282A (en) * 1961-07-21 1965-08-10 Mickley Rolf Incandescent headlight lamp having critically positioned filaments
US3206595A (en) * 1962-05-16 1965-09-14 Lollert Franz Vehicle headlamp and incandescent lamp for the same
US3293475A (en) * 1963-05-08 1966-12-20 Grunning Sven Multifilament lamp with a full shield for one filament
US3493806A (en) * 1966-03-19 1970-02-03 Philips Corp Dual-beam incandescent lamp
US3518478A (en) * 1966-06-09 1970-06-30 Lampes Elect Fab Reunies Electric incandescent lamp having an external screen and operable with a reflector

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2071979A (en) * 1933-08-17 1937-02-23 Gen Electric Electric incandescent lamp
US2617062A (en) * 1949-04-13 1952-11-04 Hartford Nat Bank & Trust Co Electric incandescent lamp
US3200282A (en) * 1961-07-21 1965-08-10 Mickley Rolf Incandescent headlight lamp having critically positioned filaments
US3206595A (en) * 1962-05-16 1965-09-14 Lollert Franz Vehicle headlamp and incandescent lamp for the same
US3293475A (en) * 1963-05-08 1966-12-20 Grunning Sven Multifilament lamp with a full shield for one filament
US3493806A (en) * 1966-03-19 1970-02-03 Philips Corp Dual-beam incandescent lamp
US3518478A (en) * 1966-06-09 1970-06-30 Lampes Elect Fab Reunies Electric incandescent lamp having an external screen and operable with a reflector

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3736452A (en) * 1970-09-30 1973-05-29 Philips Corp Halogen motorcar lamp
US3968395A (en) * 1972-09-25 1976-07-06 Siemens Aktiengesellschaft Two filament electric bulb traffic light
US4302698A (en) * 1978-09-22 1981-11-24 Patent-Treuhand-Gesellschaft Fur Elektrische Gluhlampen M.B.H. Dual-filament halogen incandescent lamp, particularly sealed-beam, automotive headlight
FR2498297A1 (fr) * 1981-01-16 1982-07-23 Cibie Projecteurs Perfectionnements aux projecteurs de croisement
US5357407A (en) * 1993-05-10 1994-10-18 Woods Michael E Light attenuator for high/low beam vehicle headlight bulb
US5578893A (en) * 1993-11-16 1996-11-26 Piaa Corporation Bulb for vehicular lighting equipment
US6281630B1 (en) 1997-04-28 2001-08-28 Osram Sylvania, Inc. Vehicle lamps with glare control
US6271622B1 (en) 1997-04-28 2001-08-07 Osram Sylvania Inc. Vehicle lamps with improved filament and filament support configurations
WO1998049716A1 (en) * 1997-04-28 1998-11-05 Osram Sylvania Inc. Vehicle lamps with glare control
JP2001525110A (ja) * 1997-04-28 2001-12-04 オスラム シルバニア インコーポレイテッド グレア制御を有する自動車ランプ
WO2015036300A1 (en) * 2013-09-13 2015-03-19 Koninklijke Philips N.V. Vibration resistant automotive front lighting lamp
CN105518823A (zh) * 2013-09-13 2016-04-20 皇家飞利浦有限公司 抗震汽车前照明灯
US20160225605A1 (en) * 2013-09-13 2016-08-04 Koninklijke Philips N.V. Vibration resistant automotive front lighting lamp
JP2016535421A (ja) * 2013-09-13 2016-11-10 コーニンクレッカ フィリップス エヌ ヴェＫｏｎｉｎｋｌｉｊｋｅ Ｐｈｉｌｉｐｓ Ｎ．Ｖ． 耐振性自動車前方照明ランプ
CN105518823B (zh) * 2013-09-13 2017-10-20 皇家飞利浦有限公司 抗震汽车前照明灯
US9805926B2 (en) * 2013-09-13 2017-10-31 Koninklijke Philips N.V. Vibration resistant automotive front lighting lamp
US20160217996A1 (en) * 2013-10-09 2016-07-28 Koninklijke Philips N.V. Vibration resistant automotive front lighting lamp
JP2016536745A (ja) * 2013-10-09 2016-11-24 コーニンクレッカ フィリップス エヌ ヴェＫｏｎｉｎｋｌｉｊｋｅ Ｐｈｉｌｉｐｓ Ｎ．Ｖ． 耐振動性の自動車用前方照明ランプ
US9899207B2 (en) * 2013-10-09 2018-02-20 Koninklijke Philips N.V. Vibration resistant automotive front lighting lamp

Also Published As

Publication number Publication date
BE734187A (xx) 1969-12-08
AT295655B (de) 1972-01-10
DE1928978B2 (de) 1976-07-01
FR2010436A1 (xx) 1970-02-13
ES167983Y (es) 1972-06-01
ES167983U (es) 1971-10-16
DE1928978A1 (de) 1970-01-29
SE347842B (xx) 1972-08-14
GB1232136A (xx) 1971-05-19
NL154058B (nl) 1977-07-15
NL6808109A (xx) 1969-12-10

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