US1397793A - Headlight - Google Patents

Headlight Download PDF

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Publication number
US1397793A
US1397793A US43638321A US1397793A US 1397793 A US1397793 A US 1397793A US 43638321 A US43638321 A US 43638321A US 1397793 A US1397793 A US 1397793A
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United States
Prior art keywords
headlight
reflector
light
reflectors
cylindrical
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
Olin W Blackett
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.)
Individual
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Individual
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Publication date
Application filed by Individual filed Critical Individual
Priority to US43638321 priority Critical patent/US1397793A/en
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Publication of US1397793A publication Critical patent/US1397793A/en
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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
    • F21V11/00—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00
    • 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
    • F21S41/321—Optical layout thereof the reflector being a surface of revolution or a planar surface, e.g. truncated
    • 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
    • F21S41/36—Combinations of two or more separate reflectors
    • 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
    • F21S41/40—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades
    • F21S41/43—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades characterised by the shape thereof
    • 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
    • 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
    • F21S41/36—Combinations of two or more separate reflectors
    • F21S41/365—Combinations of two or more separate reflectors successively reflecting the light
    • 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

  • Patented Nev. 22, 1921 PATENT OFFICE Patented Nev. 22, 1921 PATENT OFFICE.
  • This invention relates to headlights such als are used on automobiles and other vehi- O GS.
  • Suchheadlights as usually constructed, are provided with reflectors which project the rays of light so directed as to shine fully in the eyes of persons facing the front of the automobile, the glare of the headlight hav inga tendency to blind or confuse them.
  • he object of my improvement is to limit the field of illumination and confine the major portion of the rays of light toan area below the axis of the headlight, thus reducing and largely eliminating the glare of the light projecting above the axis of the said light without impairing the illumination of the roadway in front of the headlight.
  • FIG. 1 is a front elevation of the headlight
  • Fig. 2 is a central vertical section of the headlight on the line 2-2
  • Fig. l and Fig. 3 a detail view in perspective of the non-reflecting semi-cylindrical laminae and the radial supporting laminae.
  • the para bolic reflector P the surface of which is generated by the revolution of a. parabola about its axis through an angle of 180 degrees is palaced beneath a confocal elliptical reflector the surface of which is generated by the revolution of an ellipse about its major axis through an angle of 180 degrees, the axis of the two reflectors being coincident, the eccentricity of the parabola and the ellipse being so taken that the vertex of the parabola lies between the common focus and that vertex of the ellipse which is nearest to the common focus, the surface of the parabolic reflector meeting the surface of the elliptical reflector at points considerably forward of the common focus.
  • a horizontal crescent-shaped shelf or plate S of a suitable size joins and supports the parabolic and elliptical reflectors, P and E.
  • At or near the vertex of the. parabolic reflector P is an opening of sulfi- Specification of Letters Patent.
  • the parabolic and elliptical reflectors P and E extend forward of their common focus only to the points at which their surfaces ineet, the forward ends of the said reflectors being secured to a tubular or cylindrical reflector C whose axis coincides with the axis of the headlight.
  • the elliptical reflector is adjusted so that the forward focus of the said elliptical reflector headlight, either inside or outside of it as desired.
  • the front of the headlight is provided with glass G adapted to fit the said front and attached and adjusted thereto in any suitable manner so that the said glass front may be 'opened and closed when desired so that the lamp in the interior of the headlight may be replaced.
  • All of said glass front above the horizontal diameter thereof is preferably of yellow or amber color, but may be translucent, or covered with any suitable material that will absorb partially the rays light, or points adjacent thereto, as desired,-
  • the laminae which interfere with the light bulb in the interior of the headlight are shortened slightly so that they will not come in contact with the said light bulb.
  • the semi cylindrical members are supported by non-reflecting radial laminae R, secured to the interior surface of the cylindrical reflector.
  • a suitable casing A. incloses the reflectors and is adapted to be fastened to the vehicle.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Description

0. W. BLACKETT.
HEADLIGHT.
APPLICATION FIL'ED JAN. 10, 1921.
LYVEXTOR.
,1 TTORNEY.
Patented Nev. 22, 1921 PATENT OFFICE.
OLIN W. BLACKETT, 0F BROOKLINE, MASSACHUSETTS.
HEADLIGHT.
. -App1ication filed January 10, 1921.
To all whom it may concern.-
Be it known that I, OLIN WV. BLACKETT, a citizen of the United States, residing at Brookline, in the county of Norfolk and Commonwealth of Massachusetts, have invented certain new and useful Improvements in Headlights, of which the following is a specification.
This invention relates to headlights such als are used on automobiles and other vehi- O GS.
Suchheadlights as usually constructed, are provided with reflectors which project the rays of light so directed as to shine fully in the eyes of persons facing the front of the automobile, the glare of the headlight hav inga tendency to blind or confuse them.
he object of my improvement is to limit the field of illumination and confine the major portion of the rays of light toan area below the axis of the headlight, thus reducing and largely eliminating the glare of the light projecting above the axis of the said light without impairing the illumination of the roadway in front of the headlight.
I attain this object in the manner illustrated in the accompanying drawing, in which Figure 1 is a front elevation of the headlight; Fig. 2 is a central vertical section of the headlight on the line 2-2, Fig. l and Fig. 3, a detail view in perspective of the non-reflecting semi-cylindrical laminae and the radial supporting laminae.
Similar letters refer to similar parts throughout the several views. The para bolic reflector P, the surface of which is generated by the revolution of a. parabola about its axis through an angle of 180 degrees is palaced beneath a confocal elliptical reflector the surface of which is generated by the revolution of an ellipse about its major axis through an angle of 180 degrees, the axis of the two reflectors being coincident, the eccentricity of the parabola and the ellipse being so taken that the vertex of the parabola lies between the common focus and that vertex of the ellipse which is nearest to the common focus, the surface of the parabolic reflector meeting the surface of the elliptical reflector at points considerably forward of the common focus. A horizontal crescent-shaped shelf or plate S of a suitable size joins and supports the parabolic and elliptical reflectors, P and E. At or near the vertex of the. parabolic reflector P is an opening of sulfi- Specification of Letters Patent.
Patented Nov. 22, 1921.
Serial No. 436,383.
cient size and suitable shape o admit the insertion of a lighting socket. The parabolic and elliptical reflectors P and E, extend forward of their common focus only to the points at which their surfaces ineet, the forward ends of the said reflectors being secured to a tubular or cylindrical reflector C whose axis coincides with the axis of the headlight. The elliptical reflector is adjusted so that the forward focus of the said elliptical reflector headlight, either inside or outside of it as desired.
The front of the headlight is provided with glass G adapted to fit the said front and attached and adjusted thereto in any suitable manner so that the said glass front may be 'opened and closed when desired so that the lamp in the interior of the headlight may be replaced. All of said glass front above the horizontal diameter thereof is preferably of yellow or amber color, but may be translucent, or covered with any suitable material that will absorb partially the rays light, or points adjacent thereto, as desired,-
to the surface of an imaginary cone, the base of which lies at the intersection of the para? bolic and cylindrical reflectors and the vertex of which lies in the focus of the parabolic reflector, the laminae which interfere with the light bulb in the interior of the headlight are shortened slightly so that they will not come in contact with the said light bulb. The semi cylindrical members are supported by non-reflecting radial laminae R, secured to the interior surface of the cylindrical reflector. A suitable casing A. incloses the reflectors and is adapted to be fastened to the vehicle.
It will be readily seen and understood that by the arrangement of the several parts as shown and above described that light will be in the vicinity of the front of the the elliptical reflector is projected through the forward focusonto the roadway, and the reflectors are concealed by the translucent glass front and the laminae when observed 1froliln a point in frontof and above the head aving thus described my invention, I
claim and desire to secure by Letters Pat ent-- In a headlight, the combination of a casing, a parabolic reflector, an elliptical reflector,a cylindrical reflector, a source of light, said reflector being adapted to throw the light ahead, a series of semi-cylindrical, nonreflecting, parallel laminae in the lower portion of the headlight, a series of radiolaminae, supporting the semi-cylindrical laminae, and a glass front, the upper major portion of which is translucent, all substantially as described.
OLIN W. BLAOKETT.
US43638321 1921-01-10 1921-01-10 Headlight Expired - Lifetime US1397793A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4860181A (en) * 1987-09-15 1989-08-22 Iguzzini Illuminazione, S.P.A. Light shield-reflector for a lighting implement
FR2807681A1 (en) * 2000-04-14 2001-10-19 Diamac Machine tool cutter with chip removing plate has support with cavity to receive sliding prpojection on plate and fixing screw
US20060198139A1 (en) * 2005-03-07 2006-09-07 Chuan-Te Cheng Light source device for projector
US20090097269A1 (en) * 2007-10-15 2009-04-16 Automotive Lighting Reutlingen Gmbh Projection Module for an Automobile Headlight

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4860181A (en) * 1987-09-15 1989-08-22 Iguzzini Illuminazione, S.P.A. Light shield-reflector for a lighting implement
FR2807681A1 (en) * 2000-04-14 2001-10-19 Diamac Machine tool cutter with chip removing plate has support with cavity to receive sliding prpojection on plate and fixing screw
US20060198139A1 (en) * 2005-03-07 2006-09-07 Chuan-Te Cheng Light source device for projector
US20090097269A1 (en) * 2007-10-15 2009-04-16 Automotive Lighting Reutlingen Gmbh Projection Module for an Automobile Headlight
US7963684B2 (en) * 2007-10-15 2011-06-21 Automotive Lighting Reutlingen Gmbh Semiconductor projection module having two-part reflector for an automobile headlamp

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