Bulb cooling

Illumination – Light modifier – Reflector

Reexamination Certificate

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Details

C362S294000, C362S218000, C362S264000

Reexamination Certificate

active

06578991

ABSTRACT:

BACKGROUND
The present application relates for special techniques for cooling a special kind of bulb.
Special metal halide bulbs have special cooling requirements. The bulbs, such as Philips metal halide projection lamps, often have a central portion which emits light, and two “pinch” portions around the central portion.
A diagram of an exemplary one of these bulbs is shown in FIG.
1
. The bulb has a central light emitting portion
100
, and the two surrounding “pinch” portions
102
,
104
.
In some bulbs, it is desirable to keep the pinch portions
102
,
104
cooler than the center portion. This is easy to do in a laboratory condition, but more difficult to do in practice.
SUMMARY
While it may be possible easy to cool only an edge and not the center in a laboratory, the inventor recognized that doing this in practicality can be more difficult. For example, in a laboratory, the bulbs are often cooled using pipes of air. Those pipes could get in the way of the light output from the bulb, and/or the bulb's reflector. Therefore, it has been difficult to cool these kinds of bulbs.
The present application teaches a way of cooling a bulb of this type, by cooling only a pinch portion, and not the center portion. This is done by using a special combination of structure that cools at least one of the edges, but does not cool the center.


REFERENCES:
patent: 3626176 (1971-12-01), Tsugami
patent: 4630182 (1986-12-01), Moroi et al.
patent: 5372781 (1994-12-01), Hallett et al.
patent: 5746495 (1998-05-01), Klamm
patent: 5947592 (1999-09-01), Barlow

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