GB708713A - Improved anti-dazzle filters for headlights of automobiles, and a process for the manufacture of such anti-dazzle filters - Google Patents

Improved anti-dazzle filters for headlights of automobiles, and a process for the manufacture of such anti-dazzle filters

Info

Publication number
GB708713A
GB708713A GB8005/50A GB800550A GB708713A GB 708713 A GB708713 A GB 708713A GB 8005/50 A GB8005/50 A GB 8005/50A GB 800550 A GB800550 A GB 800550A GB 708713 A GB708713 A GB 708713A
Authority
GB
United Kingdom
Prior art keywords
screen
light
areas
lens
dazzle
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
GB8005/50A
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
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB708713A publication Critical patent/GB708713A/en
Expired legal-status Critical Current

Links

Classifications

    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Optical Elements Other Than Lenses (AREA)

Abstract

708,713. Anti-dazzle devices for vehicle lamps. SCHENK, K. March 30, 1950 [March 30, 1949], No. 8005/50. Classes 75 (2) and 75 (4) An anti-dazzle filter for a vehicle lamp comprises a transparent plate a having on one side a grid screen comprising light permeable areas b of parallel sided strip form separated by opaque areas c of similar form, and on the other side a lens screen d having convex lens elements each aligned with an adjacent pair of areas b, c, the focal points of the lens elements on the grid screen side lying within the thickness of said grid screen. As illustrated the areas b, c are of the same size and the filter is arranged so that a parallel lamp beam is incident on the grid screen and the beam transmitted through a single lens element is spread downwardly through an angle I, the light which would otherwise be spread upwardly through an angle II being intercepted by an opaque area c. A second lens screen d<SP>1</SP> and its support a<SP>1</SP> may be provided at the light entrance side of the screen b, a. In manufacturing the filter the support a and lens screen d may be formed homogeneously by embossing the lens screen d upon a sheet of glass or celluloid. A light sensitive layer, e.g. a chromate layer is provided on the opposite side of the support a, and is exposed through the lens screen d to substantially parallel light beams from a source of light, e.g. a luminous gas tube which by means of a condenser lens system provides converging beams each having a direction and an aperture angle corresponding to that of the light beam I to be transmitted through a lens element of the screen d. The areas of the light sensitive layer which are acted upon by the light beams become hardened and remain light permeable to form the areas b. The light sensitive material is removed from the remaining areas c of said layer by a developing operation and the areas are then rendered opaque by staining with a dye.
GB8005/50A 1949-03-30 1950-03-30 Improved anti-dazzle filters for headlights of automobiles, and a process for the manufacture of such anti-dazzle filters Expired GB708713A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE708713X 1949-03-30

Publications (1)

Publication Number Publication Date
GB708713A true GB708713A (en) 1954-05-12

Family

ID=6617675

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8005/50A Expired GB708713A (en) 1949-03-30 1950-03-30 Improved anti-dazzle filters for headlights of automobiles, and a process for the manufacture of such anti-dazzle filters

Country Status (1)

Country Link
GB (1) GB708713A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2746030A (en) * 1952-10-30 1956-05-15 Sylvania Electric Prod Image reproducing device lens structure
FR2427549A1 (en) * 1978-05-30 1979-12-28 Lucas Industries Ltd LAMP ESPECIALLY WITH REFLECTOR
EP1281911A1 (en) 2001-08-03 2003-02-05 Pierre Cibié Masking device for vehicle headlamps
DE102012024625A1 (en) * 2012-12-17 2014-06-18 GM Global Technology Operations LLC (n. d. Gesetzen des Staates Delaware) Lamp arrangement for headlight module of motor vehicle e.g. motor car, has light source having light exit openings that are spaced apart from each other in propagation direction of light beam and are arranged in panel form

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2746030A (en) * 1952-10-30 1956-05-15 Sylvania Electric Prod Image reproducing device lens structure
FR2427549A1 (en) * 1978-05-30 1979-12-28 Lucas Industries Ltd LAMP ESPECIALLY WITH REFLECTOR
EP1281911A1 (en) 2001-08-03 2003-02-05 Pierre Cibié Masking device for vehicle headlamps
FR2828152A1 (en) * 2001-08-03 2003-02-07 Pierre Cibie DEVICE FOR MASKING LIGHTING PROJECTORS OF MOTOR VEHICLES
DE102012024625A1 (en) * 2012-12-17 2014-06-18 GM Global Technology Operations LLC (n. d. Gesetzen des Staates Delaware) Lamp arrangement for headlight module of motor vehicle e.g. motor car, has light source having light exit openings that are spaced apart from each other in propagation direction of light beam and are arranged in panel form

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