Illumination – Light source and modifier – With ventilating – cooling or heat insulating means
Reexamination Certificate
1999-10-05
2002-06-11
O'Shea, Sandra (Department: 2875)
Illumination
Light source and modifier
With ventilating, cooling or heat insulating means
C362S373000, C362S188000, C362S288000, C362S264000
Reexamination Certificate
active
06402346
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a spotlight structure and, more particularly, to an easy-heat-dissipation spotlight structure.
BACKGROUND OF THE INVENTION
It is required that the conventional illuminators for use in optical instruments provide different degrees of illumination. For illuminators that provide high illumination, a fan is installed for dissipating the high heat generated in the illuminator.
Referring to
FIG. 1
that is a schematic view showing a spotlight of a conventional projector. The spotlight comprises a reflector
11
formed with a semi-ellipsoidal reflecting surface and an open end
111
; and a light-emitting lamp body
12
in the form of a metal halogen lamp. This kind of lamp does not explode at high temperature and there is no need of installing a lamp cover for it. Therefore, the fan
13
installed below the reflector
11
can provide a good heat dissipation effect for the light-emitting lamp body
12
.
Referring to
FIG. 2
, a spotlight, which provides higher illumination and includes a super high pressure mercury lamp, comprises a reflector
21
formed with an inner semi-ellipsoidal reflecting surface and having an open end
211
; a light-emitting lamp body
22
in the form of a super high pressure mercury lamp provided with an electrode
221
at the front thereof; and a lamp cover
23
made of a transparent material and closing the open end
211
of the reflector
21
.
Due to the high pressure in the tube of super high-pressure mercury lamp, the lamp will be exploded when it is overheated. Therefore, it is necessary to install a lamp cover
23
for safety. However, with a lamp cover
23
installed, the fan
13
installed below can only dissipate the heat from the outer surface of the reflector
21
and cannot direct the cooling air into the reflector
21
to cool the light-emitting lamp body
22
directly. In other words, the heat dissipation effect on the light-emitting lamp body
22
is quite limited. Due to that the focus of the spotlight is at a small distance before the cover
23
, the electrode
221
, which receives the heat from the light-emitting lamp body
22
and the heat incurred by the reflected light, has to be cooled adequately. Otherwise, the light-emitting lamp body
22
is apt to burst and the electrode
221
is apt to break due to accumulated heat.
SUMMARY OF THE INVENTION
The primary object of the invention is to provide an easy-heat-dissipation spotlight structure wherein airflow can be directed onto the light-emitting lamp body to cool it directly so that the bursting of the light-emitting lamp body can be avoided.
To achieve the above object, the easy-heat-dissipation spotlight structure in accordance with the invention comprises: a reflector formed with an inner semi-ellipsoidal reflecting surface and having an open end; a light-emitting lamp body provided at the central location of the reflector; a lamp cover provided at the open end for covering the reflector, the lamp cover forming an inlet at the lower location thereof when it covers the reflector; and a baffle unit installed at the inlet of the lamp cover so that airflow can be directed into the space defined by the lamp cover and the reflector.
The airflow generated by the fan in accordance with the invention flows through the baffle unit, cools down the electrode at the fore end of the light-emitting lamp body, and flows out of the spotlight through the outlet formed at the upper portion of the reflector.
REFERENCES:
patent: 5515251 (1996-05-01), Abke
patent: 5758957 (1998-06-01), Perrotin
patent: 5860719 (1999-01-01), Suzuki et al.
patent: 6068385 (2000-05-01), Hsieh
patent: 6164806 (2000-12-01), Shmickl et al.
Liao Juicy
Lin Rick
Bacon & Thomas PLLC
Compaq Computer Corporation
O'Shea Sandra
Ton Anabel
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