GB1276553A - Lamp with optical system for projecting a beam - Google Patents

Lamp with optical system for projecting a beam

Info

Publication number
GB1276553A
GB1276553A GB4033669A GB4033669A GB1276553A GB 1276553 A GB1276553 A GB 1276553A GB 4033669 A GB4033669 A GB 4033669A GB 4033669 A GB4033669 A GB 4033669A GB 1276553 A GB1276553 A GB 1276553A
Authority
GB
United Kingdom
Prior art keywords
lamp
aug
edge
focal plane
rear focal
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
Application number
GB4033669A
Inventor
Arnold E Westlund
Robert E Levin
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.)
GTE Sylvania Inc
Original Assignee
GTE Sylvania Inc
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 GTE Sylvania Inc filed Critical GTE Sylvania Inc
Publication of GB1276553A publication Critical patent/GB1276553A/en
Expired legal-status Critical Current

Links

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
    • F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
    • F21V9/08—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters for producing coloured light, e.g. monochromatic; for reducing intensity of light
    • F21V9/12—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters for producing coloured light, e.g. monochromatic; for reducing intensity of light with liquid-filled chambers
    • 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
    • F21S41/285—Refractors, transparent cover plates, light guides or filters not provided in groups F21S41/24 - F21S41/2805
    • 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
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/25—Projection lenses
    • 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

Landscapes

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

Abstract

1276553 Lamps GTE SYLVANIA Inc 12 Aug 1969 [14 Aug 1968] 40336/69 Heading F4R A lamp, particularly a vehicle headlamp, of the kind in which an optical element, such as a lens or ellipsoidal reflector, forms an image of a light source at the rear focal plane of a projection lens has a gate disposed at the rear focal plane to define a sharp cut-off along part of the edge of the projected beam and a filter spaced from the gate at an out-of-focus position, the filter having zones of different densities to provide a gradual cut-off along the remaining part of the edge of the beam.
GB4033669A 1968-08-14 1969-08-12 Lamp with optical system for projecting a beam Expired GB1276553A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US75260368A 1968-08-14 1968-08-14

Publications (1)

Publication Number Publication Date
GB1276553A true GB1276553A (en) 1972-06-01

Family

ID=25027000

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4033669A Expired GB1276553A (en) 1968-08-14 1969-08-12 Lamp with optical system for projecting a beam

Country Status (2)

Country Link
GB (1) GB1276553A (en)
ZA (1) ZA695800B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2558236A1 (en) * 1984-01-12 1985-07-19 Cibie Projecteurs PERFECTION OF CUTTING BEAM HEADLAMPS

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2558236A1 (en) * 1984-01-12 1985-07-19 Cibie Projecteurs PERFECTION OF CUTTING BEAM HEADLAMPS
EP0149570A2 (en) * 1984-01-12 1985-07-24 Cibie Projecteurs Improvements relating to automobile headlamps with a cut-off beam
EP0149570A3 (en) * 1984-01-12 1985-08-21 Cibie Projecteurs Improvements relating to automobile headlamps with a cut-off beam

Also Published As

Publication number Publication date
ZA695800B (en) 1971-04-28

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees