Electric lamp and discharge devices – With optical device or special ray transmissive envelope – Reflector
Reexamination Certificate
2007-05-29
2007-05-29
Glick, Edward J. (Department: 2882)
Electric lamp and discharge devices
With optical device or special ray transmissive envelope
Reflector
C313S635000, C362S346000, C362S517000
Reexamination Certificate
active
10492584
ABSTRACT:
An illumination unit has a light source, in particular a high-intensity discharge lamp or an ultra high performance lamp, a main reflector and a back reflector with an aperture opposite the main reflector. Light is reflected from the light source through the aperture onto the main reflector. The centers of the light source and the back reflector are located or shaped relative to each other such that a first sector angle (L2–L2′) enclosed between the light source center and the edge of the back reflector aperture is smaller than 180°. The efficiency of light emission is considerably increased. Preferred embodiments, each of which can cause a further increase in light output, relate to various shapes of the back reflector and the inner walls of the gas discharge space, as well as to the shape of the part of the glass bulb that surrounds the gas discharge space.
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Moench Holger
Ritz Arnd
Artman Thomas R.
Glick Edward J.
Koninklijke Philips Electronics , N.V.
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