Illumination – Supported by vehicle structure – Projection-type headlamp
Reexamination Certificate
2005-05-31
2005-05-31
O'Shea, Sandra (Department: 2875)
Illumination
Supported by vehicle structure
Projection-type headlamp
C362S296040, C362S305000, C362S388000, C362S340000, C362S335000, C362S308000, C362S309000
Reexamination Certificate
active
06899451
ABSTRACT:
The optical system for the Fresnel lens light has an ellipsoidal reflector (1), a light source (2) and a Fresnel lens (3). The distance (a) between the Fresnel lens (3) and the reflector (1) is changeable but is related to the changeable distance (b) between the light source (2) and the reflector (1) so that the aperture angle of the propagated light beam is variable but illumination intensity of the propagated light is maintained uniform. Surfaces of the at least one Fresnel lens and/or the reflector can be structured to provide more uniform illumination of a given area. The optical system is useful for lights for film, stage, studio and photography.
REFERENCES:
patent: 3428800 (1969-02-01), Levin et al.
patent: 6123436 (2000-09-01), Hough et al.
patent: 6386743 (2002-05-01), Futami et al.
patent: 34 13 310 (1985-10-01), None
patent: 39 19 643 (1991-01-01), None
Kittelmann Ruediger
Wagener Harry
O'Shea Sandra
Schott Glas
Striker Michael J.
Zeade Bertrand
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