Illumination – Multiple filament light unit – With mask or screen for at least one filament
Patent
1997-02-20
1998-03-10
Husar, Stephen F.
Illumination
Multiple filament light unit
With mask or screen for at least one filament
362 61, 362305, 362346, F21M 314
Patent
active
057252980
ABSTRACT:
To provide for improved light distribution of a vehicular headlight furning both depressed-beam and high-beam illumination, a shadow cap (9, 25) partly surrounds a main light source, typically filaments of halogen incandescent lamp, located in a reflector (2) which has two segments (14, 15) of different contours. The first one (14) of the reflector segments is optically associated with the main filament furnishing depressed-beam illumination, and this segment has a free-formed surface reflection contour. A second segment of the reflector is optically associated with an auxiliary filament (8, 18). The shadow cap (9, 25) provides a shadow angle of between 100.degree. and 140.degree. with respect to light emitted from the main filament (7) to define a shadow zone (12) and a light zone (13) on the reflector. The shadow cap is shaped and positioned with respect to the auxiliary filament (8, 18) such that the auxiliary filament is located within the shadow zone (12). The auxiliary filament is located by an offset of between 0.25 and 2 times below the optical axis (A) of the reflector, and the spatial distribution of the segments is such that the reflector is associated with a light zone and a shadow zone, respectively, as formed by the shadow cap. For high-beam illumination, with only the auxiliary filament (8, 18) energized, a concentrated beam and somewhat spread illumination based on reflection from the first reflector segment (14) is obtained; when the main filament (7) is additionally energized, concentrated beam and defined spread-out illumination results.
REFERENCES:
patent: 3493806 (1970-02-01), Jacobs et al.
patent: 3569693 (1971-03-01), Lindae et al.
patent: 4074167 (1978-02-01), van den Broek et al.
patent: 4225903 (1980-09-01), Buchleitner
patent: 4945454 (1990-07-01), Bunse et al.
patent: 5089942 (1992-02-01), Sekiguchi
patent: 5204820 (1993-04-01), Strobel et al.
Kalze Franz-Josef
Kiesel Rolf
Peitz Wolfgang
Hella KG & Hueck Co.
Husar Stephen F.
Patent-Treuhand-Gesellschaft F. Elektrische Gluehlampen mbH
LandOfFree
Vehicular headlight providing high-beam and depressed-beam illum does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Vehicular headlight providing high-beam and depressed-beam illum, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Vehicular headlight providing high-beam and depressed-beam illum will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-133581