U.S. Philips Corporation

Jan Antoon Kesseler

Leonard C Eijkelenboom

John Fitzgerald

Bowl mirrored lamps according to the invention have a filament which is arranged asymmetrically with respect to the axis of the lamp envelope and surrounds the axis over an angle greater than 180.degree. in such a manner that it does not coincide at any point with the image of the filament formed by the mirrored bowl portion of the lamp envelope. As a result of this filament positioning the lamp can in combination with a reflector provide a light beam having a very high central intensity.

Bowl mirrored lamp

Electric reflector lamps having an ellipse-like curved reflector and a hyperbola-like curved IR reflector having a higher efficiency if not only the foci of both reflectors coincide and the high source is arranged on the coinciding foci present within the space enclosed by the reflectors, but the relationship a.sub.h = f .times. c.sup.2 /a.sub.e also applies, where f is a factor dependent on the eccentricity of the ellipse.

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Eindhoven, Netherlands

Jan Antoon Kesseler