US2262098A - Head lamp of motor vehicles - Google Patents

Head lamp of motor vehicles Download PDF

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Publication number
US2262098A
US2262098A US290700A US29070039A US2262098A US 2262098 A US2262098 A US 2262098A US 290700 A US290700 A US 290700A US 29070039 A US29070039 A US 29070039A US 2262098 A US2262098 A US 2262098A
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US
United States
Prior art keywords
lamp
bulb
filament
rays
reflector
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Expired - Lifetime
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US290700A
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English (en)
Inventor
Crook Ernest William
Heighway Tennyson Jame William
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Individual
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Individual
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Publication of US2262098A publication Critical patent/US2262098A/en
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R9/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, e.g. terminal strips or terminal blocks; Terminals or binding posts mounted upon a base or in a case; Bases therefor
    • H01R9/22—Bases, e.g. strip, block, panel
    • 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

  • This invention has been designed with the object of providing for the elimination of the glare effect attendant upon the use of the ordinary types of motor vehicle head lamps, and which effeet is directed upon the vision of the drivers of 5 approaching vehicles by reason of the beams of light from the head lampsbeing thrown upwardly above the level of the lamps.
  • the invention provides for its object being made and adjusted that in combination with.
  • the ordinary parabolic reflector the beams thrown forwardly from both upper and lower halves of the reflector are directed below the the beams are contained within a semi-circle having its chord in the horizontal line of such centre. This is effected by imposing the beams of one half of the lamp upon those of the other centrated below the level of the lamp centre and thus while effectually illumining the path of the vehicle, are free from direct glaring effect upon the vision of those facing or approaching the lamps from the front who are at a higher level,
  • the invention consists in a novel construction or formation of the glass envelope of the lamp bulb so that when adjusted in a standardized position in the lamp as concerned with the relationship of the filament, or light source, thereof and the parabolic reflector of the lamp, the light rays from the filament in their passage to the reflector, are so controlled and directed that they strike the respective upper and lower halves of the reflector so, as to be projected through the lamp front, to form the composite beam of the nature before referred to.
  • the lamp bulb envelope is employed in the formation of the lamp bulb envelope. This may be effected by forming the bulb of such nature as to the two halves of its surface in relation to the horizontal axis of the bulb (when in position in the head lamp), so that one half is of prismatic nature while the other is plain, or both halves are of prismatic nature, and by so positioning the filament therein that when the bulb is placed within the ordinary holder in the lamp, the light rays are directed and controlled to obtain the beforementioned projection of the lamps beam.
  • the invention may be given effect those from the lower half. obtained by the employment of a lamp bulb so 10 by this invention.
  • the lamp bulb envelope as to its lower half of uniform thickness and as to, its
  • both halves maybe of prismatic nature. level of the lamp centre under a method in which 15 Also, it is desirable with such a bulb that provision should be made therein whereby the rays from the two halves that are thus.
  • the lamp bulb may have its filament holderso made as to cause the rays therefrom to be shielded in the horizontal plane of its thickness.
  • the lamp bulb may be furnished in its front with a reflector that will receive the rays that would miss the parabolic reflector of the lamp and throw them back on to such parabolic reflector,'to be then directed in the line ofthe main beams.
  • Figure 3 is an enlarged detail vertical sectional elevation of a lamp bulb made according to the invention and in its simplest form.
  • Figure 4 is a front cross sectional elevation thereof on the line 4-4 of Figure 3.
  • Figures 5, 6 and 7 are sectional elevations of respectively different forms of the lamp bulb.
  • Figures 8, 9 and 10 are views of diiferent forms of filament holders having the shielding property hereinbefore referred to.
  • the lamp bulb A is made on common and well known lines. It difiers, however, from the lamp bulbs as usually made, in the formation of its glass envelope, whichis so shaped that when used with the ordinary parabolic reflector B of a head lamp assembly, the rays from the bulb are controlled and directed, as shown in Figures 1 and 2, to provide for those from the lower half of the reflector being projected forwardly in a horizontal line and in a beam of semi-circular cross section having its chord horizontal across the axis of the lamp, and those from the upper half being thrown downwardly and forwardly and reversed, to produce a beam that is coincident with that from the lower. half.
  • the whole of the light rays are concentrated into a single beam of full power, diverging horizontally but controlled so that it does not rise about the axis of the lamp.
  • this is effected by shaping the lamp bulbs glass envelope so that it is divided horizontally into two sections, the lower section C being made of uniformthickness and the upper section D being of the prismatic nature shown, under which its thickness increases from its front to its rear end.
  • the lower half is made to join with the greater thickness of the upper half, as in Figure 4.
  • the filament E of single form, is positioned in the bulb at a defined position to ensure that when the bulb is made with a standardized plug end and is placed in a standardized holder to occupy a definite relationship to the reflector B, the rays thrown out .through the lower half C are projected in the manner shown in Figure l.
  • the prismatic upper half D is so made that under these conditions the rays passing through such half are refracted to the necessary angles to obtain the downward and forward direction also indicated in such figure.
  • the bulb may, however, have its filament so positioned that the same effects would be produced if the prismatic half is on the lower side and the uniform half uppermost.
  • both halves may be of prismatic form but relatively reversed in the direction of their thickening and the filament positioned to obtain by the refraction of the rays paths the aforesaid control in the beams projection from both halves of the reflector B. All of these forms are capable of being standardized for practical use.
  • the front part F of the bulb may be made opaque, or otherwise treated to prevent, the direct spreading ofrays from the filament in a forward direction. Or, it may be silvered or made of reflecting nature to throw such rays back on to the projecting reflector. Or, if desired, these rays may be caught upon the surface of an inclined reflector G (see Figures and 7) positioned in the forward end of the lamp, and.
  • This reflecting surface G must be so constructed and disposed that its bottom edge is below the horizontal plane of the lamp to the extent such as to cut off all rays that would miss the front of the lower half of the bulb.
  • This may be effected by constructing the filament holder in either of the ways shown in Figures 8 to 10 so that it is horizontally surrounded by a shield H of a width approximating to the thickness of the filament. A darkened shadow line is thus thrown on the reflector B, in a line horizontally across its axis to divide its surface area into two separate zones.
  • the prismatic formation shown in the drawings is of plain unimpeded type, it will be understood that in some cases, and for purposes of decreasing the weight of the bulb, the prism may be of stepped formation, without departing from the spirit of this invention.
  • An electric lamp bulb for use in a motor vehicle head lamp having a parabolic reflector the axis of which is substantially horizontal comprising a cylindrical base adapted to be mounted coaxially of the reflector, a filament carried by the base, and a glass envelope carried by said base and surrounding said filament, said envelope having its lower half of uniform thickness and its upper half of varying thickness increasing in thickness from its forward to its rearward edges and from its side edges toward its middle.
  • An electric lamp bulb for use in a motor vehicle headlamp having a parabolic reflector the axis of which is substantially horizontal comprising a cylindrical base adapted to be mounted coaxially of the reflector, a filament carried by the base, a glass envelope carried by said base and surrounding said filament, said envelope having its lower half of uniform thickness and its upper half of varying thickness increasing in thickness from its forward to its rearward edges and from. its side edges toward its middle, and a light reflecting screen mounted at the forward porti'onof said envelope for reflecting rays of light falling thereon through the upper half of said envelope.

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  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
US290700A 1938-08-29 1939-08-17 Head lamp of motor vehicles Expired - Lifetime US2262098A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NZ532090X 1938-08-29

Publications (1)

Publication Number Publication Date
US2262098A true US2262098A (en) 1941-11-11

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ID=19915906

Family Applications (1)

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US290700A Expired - Lifetime US2262098A (en) 1938-08-29 1939-08-17 Head lamp of motor vehicles

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US (1) US2262098A (xx)
BE (1) BE436145A (xx)
FR (1) FR859072A (xx)
GB (1) GB532090A (xx)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2678996A (en) * 1950-01-28 1954-05-18 Johnson Elmer Nonglare automobile headlight
US4899261A (en) * 1987-10-13 1990-02-06 Cibie Projecteurs Automobile headlamp with small height and high flux recovery

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2536502B1 (fr) * 1982-11-19 1987-01-09 Cibie Projecteurs Projecteur de croisement pour vehicule automobile

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2678996A (en) * 1950-01-28 1954-05-18 Johnson Elmer Nonglare automobile headlight
US4899261A (en) * 1987-10-13 1990-02-06 Cibie Projecteurs Automobile headlamp with small height and high flux recovery

Also Published As

Publication number Publication date
BE436145A (xx)
GB532090A (en) 1941-01-16
FR859072A (fr) 1940-12-10

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