US1252505A - Headlight-lens. - Google Patents

Headlight-lens. Download PDF

Info

Publication number
US1252505A
US1252505A US16577517A US16577517A US1252505A US 1252505 A US1252505 A US 1252505A US 16577517 A US16577517 A US 16577517A US 16577517 A US16577517 A US 16577517A US 1252505 A US1252505 A US 1252505A
Authority
US
United States
Prior art keywords
lens
headlight
prisms
rays
light
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
Application number
US16577517A
Inventor
Edward F Steinman
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
Priority to US16577517A priority Critical patent/US1252505A/en
Application granted granted Critical
Publication of US1252505A publication Critical patent/US1252505A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer

Definitions

  • This invention concerns lenses for headlights and more particularly lenses which,l are used in connection with headlights for! automobiles. f
  • Theobject is to construct such a lens in a manner to do away with the objectionable glare thereby rendering the use of dimmers or other means for'this purpose unnecessary.
  • Figure 1 shows an axial section of a headlight embodying my invention.'
  • Fig 2. shows the inner side of a part of the lens used in connection therewith and embodying the features of my invention.
  • Fig. 3. is a cross-section of a lens of modi ed form. ⁇ y
  • letter A indicates the re- .ilector provided with a suitable light ywhich is not shown,
  • Letter B indicates the lens positioned at the open end of this reflector and held in place at the annular edge thereof by any suitable means.
  • this shape comprises the concave center portion 5 and an annular zonal portion 6 around it and extending to the edge of the reflector.
  • the particular dimming effect whereby., -the glare is subdued is obtained by a number of concentric annular prisms C which are provided on the inner side of the lens on its 51de next to the light source, .Each one of these prisms'is substantially triangular in cross-section in its protrusion from the body of the lens, and so presented toward the light source thatl both of vits protruding surfaces are impinged by the light waves; and so that the light waves impinging on the radially inward side of the prism will be refracted in vtheir passage through the lens and thence to the outer air in a divergent direction, while the light rays converging on the radially outward' side of each prism will be so retracted that they will be con-V ;'fergent on their emergence from the lens ⁇ nto the outer air. ⁇ I am thus enabled to secure divergent and convergentrays and to treat each in a dit'erent manner, ⁇ if desirable.
  • It may be produced in the formation of I the lens while the same is cast or blown by imparting a rough surface to the pafrticular side of the prisms or it may be fdone by grinding .or sand-blasting or coating,
  • These prisms may cover the entire surface.
  • the lens may be onntted frmthe coni.'I itral 'portion thereof as shown in the draw# ang.

Landscapes

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

Description

E. F. STEINMAN.
HEADLIGHT LENS.
APPLICATION FILED MAY I.
OQ 1 9 1 m lo d Lw. m R
EDWARD F. STEINMAN, OF CINCINNATI, OHIO.
HEADLIGHT-LENS.
J Specication of Letters Patent.
Patented Jan. 8, 1918.
Application lei May 1, 1917. Serial No. 165,775.
To all 'whom t may concern:
Be it known'that I, EDWARD'F. STEINMAN, residing at Cincinnati, Hamilton county, State of Ohio, have invented certain new and useful Improvements in Headlight- Lenses,3 of whichlthe following.. isia clear, full, and exact.desciiptionfattention being called to the drawing which accompanies this application and forms a part thereof.
This invention concerns lenses for headlights and more particularly lenses which,l are used in connection with headlights for! automobiles. f
Theobject is to construct such a lens in a manner to do away with the objectionable glare thereby rendering the use of dimmers or other means for'this purpose unnecessary.
\ accompanying drawing The invention consists of the construction whereby this object is obtained and as described in the following speeilication and pointed out in the claim at theend thereof.
The construction isalso illustrated in the in which:
Figure 1. shows an axial section of a headlight embodying my invention.'
Fig 2. shows the inner side of a part of the lens used in connection therewith and embodying the features of my invention.
Fig. 3. is a cross-section of a lens of modi ed form.` y
In the drawing, letter A indicates the re- .ilector provided with a suitable light ywhich is not shown,
Letter B indicates the lens positioned at the open end of this reflector and held in place at the annular edge thereof by any suitable means.
It is made of glass by any of the approved methods of manufacture and may be cast, pressed or blown.
In profile it may be dat as shown in Fig. or it may be convex or concave or of a combination of shapes as shown in rFig. 1.
In particular this shape comprises the concave center portion 5 and an annular zonal portion 6 around it and extending to the edge of the reflector.
The particular dimming effect whereby., -the glare is subdued is obtained by a number of concentric annular prisms C which are provided on the inner side of the lens on its 51de next to the light source, .Each one of these prisms'is substantially triangular in cross-section in its protrusion from the body of the lens, and so presented toward the light source thatl both of vits protruding surfaces are impinged by the light waves; and so that the light waves impinging on the radially inward side of the prism will be refracted in vtheir passage through the lens and thence to the outer air in a divergent direction, while the light rays converging on the radially outward' side of each prism will be so retracted that they will be con-V ;'fergent on their emergence from the lens `nto the outer air.` I am thus enabled to secure divergent and convergentrays and to treat each in a dit'erent manner,`if desirable. I prefer to treat'the radially outward sides o so as to reduce the intensity of theconverging rays and to leave the other sides of the prisms fully transparent, so that the diverging rays are not reduced in intensity. This is especially desirable where the lens is used in a vehicle lamp since about one-half of the light will be concentrated in the immediate path of the vehicle, but so diminished in intensity as not to produce glare in the eyes approaching in the opposite direction, while the diverging rays light the sides of the roadway and branching roadways, and are not subdued because they are by the refraction Ydistributed over a large area, and, furthermore, arernot thrown into the eyes of anybody in such proximity to the Ivehicle as to make the glare dangerous eve-n if it should be present in these unsubdu,ed divergent rays.
It may be produced in the formation of I the lens while the same is cast or blown by imparting a rough surface to the pafrticular side of the prisms or it may be fdone by grinding .or sand-blasting or coating,
. etching, stainingv or painting the l'garticular side ot' the prisms by means of a 'substance suitable for the purpose.
These prisms may cover the entire surface.
of the lens or may be onntted frmthe coni.'I itral 'portion thereof as shown in the draw# ang.
tially triangular .cross section in its protrusion from the body of th clined side of each of vs e lens, the inner nald annular prlsms being arranged to diffuse away from -the axis of the lens incident belng arranged to refrac rays and the outer inclined side of each of said annular prisms t incident rays substantial y parallel with the axis of said lens, said ou er inclined faces being/treated lto render them translucent.
In testimony whereof I hereunto ax my
US16577517A 1917-05-01 1917-05-01 Headlight-lens. Expired - Lifetime US1252505A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US16577517A US1252505A (en) 1917-05-01 1917-05-01 Headlight-lens.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US16577517A US1252505A (en) 1917-05-01 1917-05-01 Headlight-lens.

Publications (1)

Publication Number Publication Date
US1252505A true US1252505A (en) 1918-01-08

Family

ID=3320227

Family Applications (1)

Application Number Title Priority Date Filing Date
US16577517A Expired - Lifetime US1252505A (en) 1917-05-01 1917-05-01 Headlight-lens.

Country Status (1)

Country Link
US (1) US1252505A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4371916A (en) * 1978-10-30 1983-02-01 Iao Industrie Riunite S.P.A. Motor-vehicle lamp with base area illumination

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4371916A (en) * 1978-10-30 1983-02-01 Iao Industrie Riunite S.P.A. Motor-vehicle lamp with base area illumination

Similar Documents

Publication Publication Date Title
US2254961A (en) Unitary lens system
US1241886A (en) Lens.
US1236137A (en) Headlight.
US1252505A (en) Headlight-lens.
US1874086A (en) Headlight lens
US2044224A (en) Head lamp
US1557563A (en) Lens
US1230844A (en) Device for arresting light-rays.
US2290100A (en) Lens
US1519209A (en) Lamp
US1647150A (en) Headlight
US1566127A (en) Glass lens and method of treating the same
US1245426A (en) Non-glaring headlight.
US1251211A (en) Headlight-lens.
US1738304A (en) Reflector for automobile headlights
US1342744A (en) Refractive glass for automobile-lamps
US1148650A (en) Glare-guard for headlights.
US1621085A (en) Headlight
US1916514A (en) Auxiliary driving light
US1235674A (en) Headlight.
US1780046A (en) Headlight for vehicles
US1138503A (en) Lamp.
US1678408A (en) Headlight lens
US1021104A (en) Lens.
US1263333A (en) Lens.