US1792598A - Automobile headlight - Google Patents

Automobile headlight Download PDF

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Publication number
US1792598A
US1792598A US744725A US1792598A US 1792598 A US1792598 A US 1792598A US 744725 A US744725 A US 744725A US 1792598 A US1792598 A US 1792598A
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United States
Prior art keywords
reflector
filament
lamp
lens
filaments
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
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Inventor
Clarence A Michel
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Delco Remy Corp
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Delco Remy Corp
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Filing date
Publication date
Application filed by Delco Remy Corp filed Critical Delco Remy Corp
Priority to US744725 priority Critical patent/US1792598A/en
Application granted granted Critical
Publication of US1792598A publication Critical patent/US1792598A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F21V7/00—Reflectors for light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/162—Incandescent light sources, e.g. filament or halogen lamps
    • F21S41/164—Incandescent light sources, e.g. filament or halogen lamps having two or more filaments
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/28—Cover glass
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F21S41/33—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature
    • F21S41/334—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature the reflector consisting of patch like sectors
    • F21S41/336—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature the reflector consisting of patch like sectors with discontinuity at the junction between adjacent areas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F21S41/65—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources
    • F21S41/663—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources by switching light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2107/00—Use or application of lighting devices on or in particular types of vehicles
    • F21W2107/10—Use or application of lighting devices on or in particular types of vehicles for land vehicles

Definitions

  • the central or driving lamp being usually of greater candle power than the upper lamp which is usually termed the dimmer and is employed for city driving and when passing other automobiles, whereas the main or central light is intended for road driving.
  • some form of modified lens is employed and very frequently modified forms of reflectors in order to -keep the top of the beam below a definite level which is termed the legal limit of the top of the beam.
  • the object of my invention is to employ at the center of the reflector a lamp having two filaments one of which can be used for road driving and the other one for city driving or while passing automobiles and these two filaments are so placed that, in connection with the reflector and lens, the top of the beam will always be maintained at the proper legal height but can be drawn down perceptibly for city driving or when passing other automobiles.
  • Fig. l is a vertical sectional view of the reflector and lamp arranged therein together with a lens arranged in advance of. the reflector;
  • Fig. 2 is a face view of the reflector;
  • Fig. 3 is a face view of the lens;
  • Fig. 4 is a side view thereof.
  • I employ a lamp A having two independently lighted filaments B and C, the filament B being arranged substantially on the axis D 7, 1925. Serial No. 7,447.
  • the lower half of the reflector E is a true parabola but the forward portion of the upper half is modified by bringing the portion between the points F and G within or below the true parabolic curvature of revolution, the true curvature of revolution being indicated by the dotted lines F G Whereas the actual curvature is within and indicated by the full line F G. i If this upper forward portion of the upper half of the reflector were not thus modified the rays of light emanating from the upper filament would be reflected upwardly but by bringing the curvature within or below the true parabolic curvature, as indicated, the rays of light from both filaments will be reflected downwardly.
  • the rays of light from both filaments reflected from the lower portion will be horizontally directed. and slightly below the horizontal.
  • the one piece reflector I provide transition surfaces H between the upper and lower .sections of the. reflector, the side edges of such transition surfaces being indicated by the lines I.
  • a lens K having vertical flutes L covering the major portion of the lens and flutes M covering the extreme lower portion of the lens, these flutes M being prismatic.
  • the flutes there will be lateral distribution of the light and inasmuch as the lower flutes M are prismatic there will be a bending down of the rays passing therethrough so as to prevent any possible upward tendency of the rays reflected from the forward portion of the lower' half due to the fact that the filaments have considerable longitudinal dimension and consequently are in excess of the true focal point.
  • the filament B is employed for road signature.
  • a substantially parabolic reflector and a lamp, said lamp having two independently lighted filaments, one of said filaments being located on the axis of the reflector and the other one slightly above said axis, the forward portion of the upper half of the reflector being brought within the true curvature of revolution whereby rays of light from either filament will be reflected downwardly, and a lens having a prismatic lower portion arranged in advance of the reflector and whereby any upwardly directed ray reflected from the forward ortion of the lower half of the reflector will refracted downwardly.

Description

c. A. MICHEL AUTOMOBILE HEADLIGHT 2 Sheets-Sheet 1.
Filed Feb. 7 L925 17, 1931. c M|CHEL I 1,792,598
AUTOMOB ILE HEADLIGHT Filed Feb. 1925 2 Sheets-Sheet 2 7 WO Z/ Patented Feb. 17, 1931 UNITED STATES PATENT OFFICE CLARENCE A. MICHEL, 0F CLEVELAND, OHIO, ASSIGNOR TO DELCO REMY CORPORA- TION, OF DAYTON, OHIO, A GORPOBATON OF DELAWARE AUTOMOBILE HEADLIGHT Application filed February This invention relates generally to automoblie headlights and more particularly to a novel form of reflector for use in connection with a dual. filament lamp and a modified form of lens.
In many of the automobile headlights as now constructed, two lamps are employed, the central or driving lamp being usually of greater candle power than the upper lamp which is usually termed the dimmer and is employed for city driving and when passing other automobiles, whereas the main or central light is intended for road driving. Furthermore, in most automobile headlights as at present constructed some form of modified lens is employed and very frequently modified forms of reflectors in order to -keep the top of the beam below a definite level which is termed the legal limit of the top of the beam.
The object of my invention is to employ at the center of the reflector a lamp having two filaments one of which can be used for road driving and the other one for city driving or while passing automobiles and these two filaments are so placed that, in connection with the reflector and lens, the top of the beam will always be maintained at the proper legal height but can be drawn down perceptibly for city driving or when passing other automobiles.
My invention consists in the details of construction and combination hereinafter fully described and set forth in the appended claim. V
Various forms of reflectors and lenses might be employed for carrying out my invention an d in the drawing forming a part of this specification I have shown one embodiment of such general inventive idea and in which Fig. l is a vertical sectional view of the reflector and lamp arranged therein together with a lens arranged in advance of. the reflector; Fig. 2 is a face view of the reflector; Fig. 3 is a face view of the lens; and Fig. 4: is a side view thereof.
In order to carry out my invention I employ a lamp A having two independently lighted filaments B and C, the filament B being arranged substantially on the axis D 7, 1925. Serial No. 7,447.
of the reflector E while the filament C is arranged a short distance above the same. The lower half of the reflector E is a true parabola but the forward portion of the upper half is modified by bringing the portion between the points F and G within or below the true parabolic curvature of revolution, the true curvature of revolution being indicated by the dotted lines F G Whereas the actual curvature is within and indicated by the full line F G. i If this upper forward portion of the upper half of the reflector were not thus modified the rays of light emanating from the upper filament would be reflected upwardly but by bringing the curvature within or below the true parabolic curvature, as indicated, the rays of light from both filaments will be reflected downwardly. The rays of light from both filaments reflected from the lower portion will be horizontally directed. and slightly below the horizontal. In order to prevent the formation of sharp angles between the lower half of the reflector and the modified portion and also to facilitate the fabrication of the one piece reflector I provide transition surfaces H between the upper and lower .sections of the. reflector, the side edges of such transition surfaces being indicated by the lines I. By means of the reflector as thus constructed and the two filament lamp positioned in the manner herein set forth all of the rays of light from either filament will be directed either horizontally or below the horizontal. In connection with the lamp and re flector as herein described I employ a lens K having vertical flutes L covering the major portion of the lens and flutes M covering the extreme lower portion of the lens, these flutes M being prismatic. By means of the flutes there will be lateral distribution of the light and inasmuch as the lower flutes M are prismatic there will be a bending down of the rays passing therethrough so as to prevent any possible upward tendency of the rays reflected from the forward portion of the lower' half due to the fact that the filaments have considerable longitudinal dimension and consequently are in excess of the true focal point.
In use the filament B is employed for road signature.
driving and the top of the beam will be projected forwardly a considerable distance in this manner the desired road illumination may be obtained. For city driving, however, and when passing other automobiles the filament B will be cut out and the filament C out in and the top of the beam will then be perceptibly deflected or thrown downwardly thereby avoiding all possibility of glare as it is.well understood that, owing to uneveness of the roadway or to the movement of the vehicle, there are times when stray beams are dangerous notwithstanding the fact that modified lenses and reflectors may be employed but experience has demonstrated that y means of the double filament lamp in combination with the reflector and lens as herein shown and described a decided vertical deflection of the top of the beam is obtained and the liability of glare reduced to a minimum.
Having thus described my invention, what I claim is In a light projector, the combination of a substantially parabolic reflector and a lamp, said lamp having two independently lighted filaments, one of said filaments being located on the axis of the reflector and the other one slightly above said axis, the forward portion of the upper half of the reflector being brought within the true curvature of revolution whereby rays of light from either filament will be reflected downwardly, and a lens having a prismatic lower portion arranged in advance of the reflector and whereby any upwardly directed ray reflected from the forward ortion of the lower half of the reflector will refracted downwardly.
In testimony whereof; I hereunto aflix my CLARENCE A. MICHEL.
US744725 1925-02-07 1925-02-07 Automobile headlight Expired - Lifetime US1792598A (en)

Priority Applications (1)

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US744725 US1792598A (en) 1925-02-07 1925-02-07 Automobile headlight

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4945453A (en) * 1988-08-16 1990-07-31 Koito Manufacturing Co., Ltd. Vehicular headlamp

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4945453A (en) * 1988-08-16 1990-07-31 Koito Manufacturing Co., Ltd. Vehicular headlamp

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