Headlamp for motor vehicles
AssigneeKoito Manufacturing Co., Ltd.
InventorsHiroyuki Serizawa, Hiroyuki Takatsuka
Life of this patent
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Abstract
A paraboloidal effective reflecting surface of a reflector is divided into an upper effective reflecting surface for forming a preset pattern of the low beam and a lower effective reflecting surface for forming a preset pattern for supplementing the pattern. First shades for forming clear cutting lines of the low beams is disposed close to an arc tube as a light source. The glare caused by the reflection of light on the upper effective reflecting surface is reduced. The resultant clear cutting lines are sharp. The second shades, which are provided outside the first shades, cut the light beams that pass above the first shades and direct to the partition lines (stepped parts). As a result, no glare is caused by the reflection of light at the partition lines.
Claims22
A headlamp for motor vehicles, comprising:
- a reflector having a paraboloidal effective reflecting surface;
- a bulb insertion hole formed at a rear top of said reflector;
- a discharge bulb coupled to said bulb insertion hole, said discharge bulb comprising a sealed glass bulb, an arc tube accommodated in said glass tube, and a pair of electrodes housed in said sealed glass bulb, said electrodes positioned oppositely of each other in a front-rear direction of the headlamp, a center of said paired electrodes being substantially coincident with a focal point of said effective reflecting surface;
- a front lens provided in front of the effective reflecting surface,
- said effective reflecting surface comprising an upper effective reflecting surface having a focal point positioned at a point closer to said effective reflecting surface than said center of said electrodes, and a lower effective reflecting surface having a focal point positioned at a point closer to said front lens than said center of electrodes, said upper and lower effective reflecting surfaces defining a partition line therebetween;
- a pair of shades disposed on both sides of said arc tube for cutting light directed from said sealed glass bulb to said partition line and contributing to formation of clear cutting lines of low beams, said paired shades comprising:
- a pair of first shade members, disposed close to said arc tube, for cutting light emitter from a lower side of said sealed glass bulb and directed to said upper effective reflecting surface;
- and a pair of second shade members, disposed outside and close to said first shade members, for cutting light emitted from said sealed glass bulb and directed to said partition lines without being intercepted by said first shades.
Dependencies are inferred from the claim text.