GB2311593A - Vehicle headlamp with dichroic filter - Google Patents

Vehicle headlamp with dichroic filter Download PDF

Info

Publication number
GB2311593A
GB2311593A GB9615617A GB9615617A GB2311593A GB 2311593 A GB2311593 A GB 2311593A GB 9615617 A GB9615617 A GB 9615617A GB 9615617 A GB9615617 A GB 9615617A GB 2311593 A GB2311593 A GB 2311593A
Authority
GB
United Kingdom
Prior art keywords
lamp
dichroic filter
headlamp
light
automobile
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.)
Withdrawn
Application number
GB9615617A
Other versions
GB9615617D0 (en
Inventor
Duk-Sung Park
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.)
Samsung SDI Co Ltd
Original Assignee
Samsung Display Devices Co Ltd
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 Samsung Display Devices Co Ltd filed Critical Samsung Display Devices Co Ltd
Publication of GB9615617D0 publication Critical patent/GB9615617D0/en
Publication of GB2311593A publication Critical patent/GB2311593A/en
Withdrawn legal-status Critical Current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
    • F21V9/04—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters for filtering out infrared radiation
    • 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
    • F21S41/12—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of emitted light
    • F21S41/13—Ultraviolet light; Infrared light
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/10—Protection of lighting devices
    • 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
    • F21V7/22—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors
    • 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
    • F21V9/06—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters for filtering out ultraviolet radiation
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/26—Reflecting filters

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Optical Filters (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)

Description

2311593 E2ADLAMP FOR AN AUTOMOBILE "LOYING DICHROIC FILTER The present
invention relates to an automobile headlamp, and more particularly, to an automobile headlamp with improved light emission efficiency and adapted to provide protection for a lens by employment of a dichroic filter.
A conventional automobile headlamp, as shown in FIG. 1, is described in U.S. Patent No. 5,237,489. In FIG. 1, a headlamp comprises a lamp 11 as a light source, a reflection mirror 12 for reflecting forward light emitted from the lamp 11, a diaphragm 13 installed in front of the lamp 11, and a projection lens 14 installed at the light-emitting end of the headlamp.
Besides visible rays, the lamp 11 also emits infrared rays, including thermal rays, and ultraviolet rays. The thermal infrared rays deform the projection lens, and the shorter wavelength ultraviolet rays may produce harmful effects on the is human body or on other living things.
Moreover, the rays of light which are emitted directly forward from the headlamp of a driven car interfere with the eyesight of oncoming drivers. The conventional headlamp therefore employs the diaphragm 13 or a blackened projection lens 14 to diminish the direct emission of light. Doing so, however, unavoidably reduces the quantity of light emitted from the headlamp.
It is an object of the present invention to provide a headlamp having improved light-emitting efficiency and providing protection of a lens, in which infrared rays and ultraviolet rays are intercepted by employing a frosted dichroic filter.
1 To achieve the above object, there is provided an automobile headlamp according to the present invention, comprising a lamp, a reflection mirror, installed around the lamp, for reflecting light emitted from the lamp, a dichroic filter installed in front of the lamp, for intercepting infrared rays and ultraviolet rays of said light, and a projection lens for projecting the light transmitted through the dichroic filter forward.
Also, a frosted portion, which is treated to be frosted, is formed in the middle of the dichroic filter.
Specific embodiments of the present invention are described in detail below, by way of example, with reference to the attached drawings, in which:
FIG. 1 is a sectional view of a conventional automobile headlamp; and is FIG. 2 is a sectional view of an automobile headlamp employing a dichroic filter according to an embodiment of the present invention.
FIG. 2 shows an automobile headlamp employing a dichroic filter according to an embodiment of the present invention. In FIG. 2, light emitted from a lamp 21, i.e., a light source, is reflected to a projection lens 23 located at the front end of the headlamp by a reflection mirror 22 installed around the lamp 21.
A dichroic filter 24, which intercepts infrared rays and ultraviolet rays and which allows visible rays only to pass therethrough, is installed between the lamp 21 and the projection lens 23.
Moreover, a frosted portion 24a, which is treated so as to be frosted, is formed in the middle of the dichroic filter 24 to 2 prevent rays of light directly from the lamp from being emitted f rom the headlamp. Since the light emitted f rom the lamp 21 passes through and is refracted by the frosted portion 24a, there is no interference with a driver's eyesight caused by the emission of direct rays of light. Further, as the frosted portion 24a does not intercept the light emitted from the lamp 21, but passes it with refraction, the quantity of light ultimately transmitted through the projection lens 23 is increased over that obtained in the headlamp with the diaphragm 13 (in FIG. 1) or with the blackened projection lens 14 (in FIG. 1), thus providing improved efficiency in utilization of the light emitted from the lamp 21.
As described above, the automobile headlamp according to embodiments of the present invention can intercept infrared rays is which may deform the projection lens and ultraviolet rays which may produce harmful effects to the human body by employment of the dichroic filter. Furthermore, by forming the frosted portion in the middle of the dichroic filter, the automobile headlamp according to an embodiment of the present invention can prevent accidents caused by interference with the eyesight of drivers arising from emission of rays of light direct from the lamp, and can also provide decreased electric power consumption by improvement in the efficiency of utilization of light emitted from the lamp.
3

Claims (3)

CLAIMS:
1. A headlamp for an automobile, comprising:
lamp; reflection mirror installed around said lamp for reflecting light emitted from said lamp; a dichroic filter installed in front of said lamp for interception of infrared rays and ultraviolet rays in said light; and a projection lens for forward projection of light transmitted through said dichroic filter.
2. A headlamp for an automobile as claimed in claim 1, wherein a frosted portion, which is treated so as to be frosted, is formed in a central part of said dichroic filter.
3.A headlamp for an automobile substantially as described is herein with reference to Figure 2 of the accompanying drawings.
4
GB9615617A 1996-03-29 1996-07-25 Vehicle headlamp with dichroic filter Withdrawn GB2311593A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019960009178A KR970066252A (en) 1996-03-29 1996-03-29 Automotive headlamps with dichroic filter

Publications (2)

Publication Number Publication Date
GB9615617D0 GB9615617D0 (en) 1996-09-04
GB2311593A true GB2311593A (en) 1997-10-01

Family

ID=19454459

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9615617A Withdrawn GB2311593A (en) 1996-03-29 1996-07-25 Vehicle headlamp with dichroic filter

Country Status (5)

Country Link
JP (1) JPH09267683A (en)
KR (1) KR970066252A (en)
CN (1) CN1165932A (en)
DE (1) DE19630935A1 (en)
GB (1) GB2311593A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6896396B2 (en) 2001-07-06 2005-05-24 Koito Manufacturing Co., Ltd. Automotive infrared lamp
US7244049B2 (en) 2004-07-06 2007-07-17 Ichikoh Industries, Ltd. Light assembly for vehicle

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19907365A1 (en) * 1999-02-20 2001-01-04 Matthias Rettig Xenon headlamp for automobile has filters or filter foils used for absorbing selected light components to prevent dazzle of oncoming automobile driver
US9377171B2 (en) * 2014-08-01 2016-06-28 GM Global Technology Operations LLC Lens system and method for eliminating sun focusing thermal effects in lamps

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1364927A (en) * 1972-11-10 1974-08-29 Feldmesser K Automobile headlamps
EP0043114A1 (en) * 1980-07-02 1982-01-06 GTE Products Corporation Projection lamp comprising single ended arc discharge lamp and an interference filter
US4388678A (en) * 1980-10-14 1983-06-14 Turner Wheeler M Reading and viewing lamp
GB2183363A (en) * 1985-10-31 1987-06-03 Toshiba Kk Optical interference film
GB2272278A (en) * 1992-10-23 1994-05-11 Cancer Res Campaign Tech Non-laser light source

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1364927A (en) * 1972-11-10 1974-08-29 Feldmesser K Automobile headlamps
EP0043114A1 (en) * 1980-07-02 1982-01-06 GTE Products Corporation Projection lamp comprising single ended arc discharge lamp and an interference filter
US4388678A (en) * 1980-10-14 1983-06-14 Turner Wheeler M Reading and viewing lamp
GB2183363A (en) * 1985-10-31 1987-06-03 Toshiba Kk Optical interference film
GB2272278A (en) * 1992-10-23 1994-05-11 Cancer Res Campaign Tech Non-laser light source

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6896396B2 (en) 2001-07-06 2005-05-24 Koito Manufacturing Co., Ltd. Automotive infrared lamp
US7244049B2 (en) 2004-07-06 2007-07-17 Ichikoh Industries, Ltd. Light assembly for vehicle

Also Published As

Publication number Publication date
DE19630935A1 (en) 1997-10-02
KR970066252A (en) 1997-10-13
CN1165932A (en) 1997-11-26
JPH09267683A (en) 1997-10-14
GB9615617D0 (en) 1996-09-04

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)