IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0287221
(2002-11-04)
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발명자
/ 주소 |
- Begemann, Simon H. A.
- Harbers, Gerard
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출원인 / 주소 |
- Koninklijke Philips Electronics N.V.
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
21 인용 특허 :
1 |
초록
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A headlamp (2; 3) of a vehicle (1) has a light source (4; 5) comprising a plurality of opto-electronic elements (11; 12; 13; 14), preferably light-emitting diodes (LED's). At least one of these opto-electronic elements (11; 12; 13; 14) has, in operation, a luminous flux of 5 lm or higher. According
A headlamp (2; 3) of a vehicle (1) has a light source (4; 5) comprising a plurality of opto-electronic elements (11; 12; 13; 14), preferably light-emitting diodes (LED's). At least one of these opto-electronic elements (11; 12; 13; 14) has, in operation, a luminous flux of 5 lm or higher. According to the invention, the spectral characteristic of the light beam (6, 6'; 7, 7') generated by the light source (4; 5) depends upon the position in the light beam (6, 6'; 7, 7'). Preferably, the light source (4; 5) comprises opto-electronic elements (11; 12; 13; 14) only. The light beam comprises at least two light beam segments (6, 6'; 7, 7') having essentially different spectral characteristics. Preferably, one of the light beam segments (6'; 7') is mesotopically tuned. In particular, a first light beam segment (6; 7) comprises a considerable amount of white or yellow-orange light, and a second light beam segment (6'; 7') comprises a considerable amount of blue-green light.
대표청구항
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1. A vehicle headlamp comprising a light source, wherein the light source comprises a plurality of opto-electronic elements, a light beam generated by the light source has at least two beam segments, each with a substantially different spectral characteristic, the beam segments not entirely over
1. A vehicle headlamp comprising a light source, wherein the light source comprises a plurality of opto-electronic elements, a light beam generated by the light source has at least two beam segments, each with a substantially different spectral characteristic, the beam segments not entirely overlapping each other, and the spectral characteristic of one of the beam segments is mesotopically tuned. 2. A vehicle headlamp comprising a light source, the light source comprising a plurality of opto-electronic elements, a light beam generated by the light source having at least a first beam segment and a second beam segment, the first beam segment having a spectral characteristic which is rich in green-yellow light, and the second beam segment having a spectral characteristic which is rich in blue-green light, a first area illuminated by the first beam segment, not being entirely within a second area illuminated by the second beam segment, and the second area not being entirely within the first area. 3. A vehicle headlamp as claimed in claim 2, wherein the opto-electronic elements comprise light-emitting diodes. 4. A vehicle provided with a headlamp comprising a light source having a plurality of opto-electronic elements, a beam of visible light generated by the light source having a spectral characteristic in a plane transverse to the direction of the beam, said spectral characteristic varying dependent upon a position in the light beam on said plane. 5. A lamp comprising a light source provided with a plurality of opto-electronic elements, the spectral characteristic of a light beam generated by the light source varying from a first point to a second point in the light beam, the first point illuminating a first area with light of a first spectral characteristic, the second point illuminating a second area with light of a second spectral characteristic, the first spectral characteristic being substantially different from the second spectral characteristic. 6. The lamp of claim 5, wherein the first spectral characteristic is green-yellow light and the second spectral characteristic is blue-green light. 7. The lamp of claim 5, wherein the second spectral characteristic is mesotopically tuned. 8. The lamp of claim 5, wherein one of the first spectral characteristic and the second spectral characteristic is mesotopically tuned. 9. The lamp of claim 5, wherein one of the first spectral characteristic and the second spectral characteristic is adapted to a light intensity in the range between the photopic and scotopic eye sensitivity curve. 10. The vehicle lamp of claim 1, wherein the spectral characteristic of said one of the beam segments is adapted to a light intensity in the range between the photopic and scotopic eye sensitivity curve.
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