Electric lamp and discharge devices: systems – Combined load device or load device temperature modifying... – Discharge device load with distributed parameter-type...
Reexamination Certificate
2002-04-12
2003-10-14
Wong, Don (Department: 2821)
Electric lamp and discharge devices: systems
Combined load device or load device temperature modifying...
Discharge device load with distributed parameter-type...
C313S045000
Reexamination Certificate
active
06633130
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a cooling system of a lighting apparatus using microwave energy.
2. Description of the Prior Art
A lighting apparatus using microwave energy emits visible rays or ultraviolet rays by applying microwave energy to an electrodeless plasma lamp, it has longer life-span and shows better lighting efficiency than that of an incandescent lamp and a fluorescent lamp.
FIG. 1
is a longitudinal sectional view illustrating a lighting apparatus using microwave energy in accordance with the conventional art.
As depicted in
FIG. 1
, the conventional lighting apparatus using microwave energy includes a magnetron
2
installed inside a casing and generating microwave energy, a high voltage generator
3
boosting the voltage of utility AC power and supplying it to the magnetron
2
, a wave guide
4
connected to an outlet of the magnetron
2
and transmitting microwave energy generated in the magnetron
2
, a bulb
5
generating a light by using enclosed luminous materials in a plasma state by receiving the microwave energy transmitted through the wave guide
4
, a resonator
6
covering the front portion of the bulb
5
in order to cut off the microwave energy and pass the light emitted from the bulb
5
, a reflector
7
receiving the resonator
6
and focus-reflecting the light generated in the bulb
5
straightly, a dielectric mirror
8
installed inside the resonator
6
at the rear of the bulb
5
in order to pass the microwave energy and reflect the light, and a cooling fan assembly
9
placed at the side of the casing
1
and cooling the magnetron
2
and the high voltage generator
3
.
The bulb
5
is constructed with a luminous unit
5
a
made of quartz and ceramic and having enclosed luminous materials in order to emit lights by being excited by microwave energy and an axial unit
5
b
combined with the luminous unit
5
a
by welding and extended toward inside the casing
1
.
In addition, the bulb
5
cools high heat generated at the luminous unit
5
a
by being rotated according to a bulb motor
10
.
In the meantime, in the conventional lighting apparatus using microwave energy, the magnetron
2
generates microwave energy according to a power apply, the microwave energy generated in the magnetron
2
excites the luminous unit
5
a
of the bulb
5
after passing the wave guide
4
and the resonator
6
, and the luminous unit
5
a
generates lights. The lights generated in the luminous unit
5
a
are reflected by the reflector
7
, accordingly a lighting function can be performed.
However, in the operation of the conventional lighting apparatus using microwave energy, lots of heat is generated at the magnetron
2
, the wave guide
4
and the high voltage generator
3
, etc., as depicted in
FIG. 1
, the magnetron, etc. are cooled by sucking external air into the casing
1
by using the cooling fan assembly
9
.
However, because the lighting apparatus can be used at outdoors as well as indoors, in an air cooling type using a cooling fan in order to cool a heat generating unit of the lighting apparatus using microwave energy, impurities such as bugs, dusts, etc. or rain may come into, accordingly the apparatus may be damaged or a life-span of the apparatus may be lowered.
Particularly, if a quantity of a lighting apparatus is increased in order to improve a brightness, heat generated inside the apparatus has to be discharged more efficiently.
SUMMARY OF THE INVENTION
In order to solve the above-mentioned problems, it is an object of the present invention to provide a lighting apparatus using microwave energy which is capable of discharging heat generated inside the apparatus to outside more efficiently and having a sealed cooling structure preventable penetration of external impurities by installing a heat exchanger having a coolant path to the exterior of internal heat generating units.
In order to achieve the above-mentioned object, in a lighting apparatus using microwave energy including a magnetron for generating microwave energy, a bulb for generating lights by the microwave energy, a wave guide for connecting the magnetron and the bulb and transmitting the microwave energy generated in the magnetron to the bulb and a casing housing the magnetron and the wave guide and combining with the bulb, a cooling system of a lighting apparatus using microwave energy comprises a heat exchanger installed to the exterior of a magnetron and having a coolant path, a radiating unit installed to the exterior of the casing and radiating heat of the coolant heated while passing the coolant path of the heat exchanger, and a flow generating means installed between an outlet of the radiating unit and an inlet of the heat exchanger in order to make the coolant circulate the heat exchanger and the radiating unit.
In a lighting apparatus using microwave energy including a magnetron for generating microwave energy, a bulb for generating lights by the microwave energy, a wave guide for connecting the magnetron and the bulb and transmitting the microwave energy generated in the magnetron to the bulb and a casing housing the magnetron and the wave guide inside and combining with the bulb, a cooling system of a lighting apparatus using microwave energy comprises a heat exchanger installed to the exterior of internal heat generating units of the lighting apparatus and having a coolant path, a radiating unit installed to the exterior of a casing and radiating heat of a coolant heated while passing the coolant path of the heat exchanger, and a flow generating means installed between an outlet of the radiating unit and an inlet of the heat exchanger in order to make the coolant circulate the heat exchanger and the radiating unit.
REFERENCES:
patent: 3814983 (1974-06-01), Weissfloch et al.
patent: 3911318 (1975-10-01), Spero et al.
patent: 4695757 (1987-09-01), Ury et al.
patent: 5866990 (1999-02-01), Ury et al.
patent: 6351070 (2002-02-01), Barry
LG Electronics Inc.
Vu Jimmy T.
Wong Don
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