Патент USA US2105419код для вставки
Jan. 11, 1938. w_ HONlNG I 2,105,419 VEHICLE HEAD LAMP Filed NOV. 20, 1934 f H .a/ H ‘36 ' W M [ZVT/"ENTUR I/YiL HE'LM HUNINE' H “w Him? 649W '2' TURNS‘? 3 Jan. ll, 13% T? 2,105,419 ” FEW 7 vnmcan HEAD , Wilhelm Honing, Eindhoven, Netherlands, as signor to General Electric Company, a corpora tion of New York Application November 20, 1934, Serial No. 753,8“!3 In Germany December 22, 1933 4 Claims. (Cl. 1'36-26) My invention relates to vehicle headlamps and the ?laments l2, [3 have separate circuit con more particularly to an incandescent electric nections and may be independently energized. lamp for use therein having a novel ?lament ar rangement for producing a desired ligh't distribu 5 tion. ‘ v One of the objects of my invention is to provide a ?lament arrangement in a headlamp whereby a driving beam is produced having a “hot spot” of light of high intensity and of uniform shape 10 and comparatively large depth, while the beam for use when approaching an oncoming vehicle is of comparatively wide lateral spread. , According to my invention the above object is _ attained by employing a pair of ?laments in the - The lamp is preferably mounted in the usual paraboloidal re?ector of a headlamp so that the ?lament l2 extends through the focal point of 5 the re?ector in a vertical plane, and the ?lament I3 is in a horizontal plane. This ?lament ar rangement in a headlamp employing a standard form of lens having vertical ?utes across the middle and horizontal prisms at the top and bot- 10 tom provides, with the vertical ?lament It’, a driving bea'm having a cross section in a vertical plane substantially as shown at 20 in Fig. 3. The said beam has a hot spot 2! of high in 1" lamp arranged in substantially the shape of a T tensity and relatively large depth at the middle 15 with the ?lament constituting the vertical leg of the beam, thereby providing a maximum of of the T arranged in a vertical plane which pref light straight down the roadway where it is erably passes through the focal point of the re most desirable. The horizontal ?lament l3 pro ?ector. The said vertical ?lament is used to vides a beam having a cross-section in a ver 20 produce the “driving” beam and the horizontal - tical plane substantially as shown at 22 in Fig. 4 20 ?lament is used to produce the “meeting” beam. where the line H-H represents the horizontal ' Further features and advantages of my in plane. The said beam 22 has a very desirable vention will appear from the following detailed wide lateral spread and affords a good meeting description of species thereof. 25 ' In the drawing; Fig. 1 is a perspective view of beam. ' - ' What I claim as new and desire to secure by 25 an incandescent lamp with a ?lament arrange- . Letters Patent of the United’ States is: ment according to my invention; Fig. 2 is'a front view thereof; Fig. 3 is a diagrammatic showing of a section of a driving beam produced by the 30 lamp; and Fig. 4 is a similar showing of a meet ing beam. Referring to Figs. 1 and 2, the lamp comprises a base l0 and a bulb ll having a pair of ?la ments I 2, I3 sealed therein. The said ?laments 35 l2, l3 are in the form of helical coils having 1. An electric incandescent lamp for vehicle headlamps comprising a bulb containing a pair of ?laments with separate circuit connections, said ?laments being straight linear ?laments 30 and being arranged substantially in the form of a T located in a plane perpendicular to the lon gitudinal axis of the lamp. _ 2. An electric incandescent lamp for vehicle headlamps comprising a bulb containing a pair of 35 linear or straight-line axes, the ?lament ll be ?laments with separate circuit connections, said ing'preferably located in a plane passing through ?laments being straight linear ?laments and be the longitudinal axis of the lamp with said ?la ing arranged substantially in the form of a T ment disposed perpendicular to said axis, while located in a plane perpendicular to the longitui‘ 40 the ?lament [3 extends transversely of said axis dinal axis of the lamp, the vertical leg of. said T 40 and at right angles to ?lament II. In other being located substantially in a plane extending words, the said ?laments l2, I3 are arranged in through the said longitudinal axis of the lamp. substantially the shape of a T located in a plane 3. An electric incandescent lamp for vehicle extending transversely of, or perpendicular to, headlamps comprising a bulb adapted to be 45 the lamp axis. Where standard bayonet pins I4, mounted with its axis horizontal, a stem extend- 4.’; III are employed, they may be located on the ing into said bulb axially thereof, three lead wires base It! in the same plane as the ?lament l2. extending through said stem and projecting for The ?lament i2 is secured at one end tora lead wardly thereof one above the other, the middle wire vl5 and at its opposite end to a common lead lead wire'having a laterally extending portion lo A 50 wire 16. The?lament I3 is secured at one end to the common lead wire IS and at its opposite end to a lead wire 11. Portions of said leads l5, l6, I‘! are sealed in the ‘press portion l8 of a stem tube l9, the said‘ leads extending to respec 55 tive terminals or contacts in the base “I so that cated directly above the end of the lower lead 50 wire and a short end portion extending vertically upward and located on the opposite side of the bulb axis from the end of the upper lead wire, the ends of said lead wires and the laterally ex tending portion of said middle lead wire being 55 2,105,410 located in a plane perpendicular to the bulb axis. . a ?lament connected at one end to the end of said lower lead wire and extending vertically upward and being connected at its other end'to the said laterally extending portion of said mid die wire, and a second horizontally disposed ?la ' 'ment connected at each end to an end of said middle an upper lead wires and forming with said middle and upper lead wires - being offset one on each side of the bulb axis and‘each being bent toward the opposite side of said axis, the lateral ly extending portion of said middlelead wire be ing directly above the end of the lower lead wire, a ?lament connected at one end to the end of said lower lead wire and extending vertically upward and being connected at ‘its other end to ?rst-mentioned ?lament a T located in a plane the said laterally extending portion of said middle ' lead wire, and a second horizontally disposed 10 10 perpendicular to the bulb axis, and-circuit con ' nections for energizing said ?laments separately. ?lament connected at each end to an end of said , 4. An electric incandescent lamp for vehicle middle and upper lead wires and forming with headlamps comprising a bulb adapted to be said ?rst-mentioned ?lament a T located in a plane perpendicular to the bulb axis, and circuit mounted with its axis horizontal, a stem extend ‘ into said bulb axially thereof, three lead ‘connections for energizing said ?laments sep 15 in: 15 arately. . wires extending through said stem and project- ' ing forwardly thereof one above the other, the WlLHEL-M HONING.