Electric lamp and discharge devices: systems – With load device temperature modifier
Reexamination Certificate
2002-01-31
2004-01-20
Lee, Wilson (Department: 2821)
Electric lamp and discharge devices: systems
With load device temperature modifier
C315S248000, C315S039510
Reexamination Certificate
active
06680576
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a lighting apparatus using microwave energy, and more particularly, to a lighting apparatus using microwave energy which is capable of radiating heat generated in a microwave generator outside of a casing.
2. Description of the Background Art
A lighting apparatus using microwaves emits visible rays or ultraviolet rays by applying microwaves to an electrodeless lamp. Such a device has a longer lifespan and provides better lighting efficiency than that of an incandescent lamp or a fluorescent lamp.
FIG. 1
is a longitudinal, sectional view illustrating a lighting apparatus using microwaves in accordance with the background art.
The lighting apparatus using microwaves is constructed with a front casting
1
, a rear casing
2
, a waveguide
3
for transmitting microwaves generated in a magnetron
10
, and a high voltage generator
4
for boosting the AC power and supplying it to the magnetron
10
.
A reflecting mirror
6
for reflecting light generated in a bulb
5
towards the front is installed at the exterior of the front casing
1
.
The magnetron
10
generating microwaves is installed at the side wall of the waveguide
3
. The bulb
5
generating light with enclosed materials in a plasma state by microwave is installed at the upper portion of the waveguide
3
. A resonator
8
for passing the light emitted in the bulb
5
while cutting off the microwaves covers the front side of the bulb
5
and is assembled so as to project from the front casing
1
.
A bulb motor
7
is connected to the bulb
5
with a shaft
5
a
and rotates the bulb
5
in order to cool it down.
A fan housing
9
a
having a suction hole
2
a
and a discharge hole
2
b
is placed in the rear casing
2
in order to cool down the magnetron
10
and the high voltage generator
4
, etc.
A cooling fan
9
b
is installed inside the fan housing
9
a
, and a fan motor
9
c
which operates the cooling fan
9
b
is installed inside the rear casing
2
.
An outlet
1
a
is formed at the front casing
1
in order to discharge the air drawn in by the operation of the cooling fan
9
b
after cooling down the elements inside the casing.
FIG. 2
is a sectional view taken along the line of A—A of FIG.
1
. It illustrates the structure of the magnetron of the lighting apparatus using microwave in accordance with the background art.
The magnetron
10
includes a housing
19
containing the elements for generating microwaves and a filter box
20
connected to the high voltage generator
4
, shown in
FIG. 1
for applying the boosted voltage and having a condenser
21
and a choke coil
23
for performing a filter function. An output pipe
25
extends inside of the waveguide
3
, as shown at
FIG. 1
for outputting microwave is placed at the front of the housing
19
.
Inside the housing
19
, there is a cathode unit
15
having a filament shape which emits a large amount of heat electrons by being heated with power applied through the filter box
20
; an anode unit
11
generating microwaves by moving the electrons from the cathode unit
15
between a vane
13
and a strap
14
at a requested frequency bandwidth according to certain rules when a fixed amount of anode voltage and anode currents are applied to an anode body
12
having a cylinder shape; an antenna
16
for transmitting the microwave energy generated in the operation space of the anode unit
11
and the cathode unit
15
inside the waveguide
1
as shown at
FIG. 1
; and permanent magnets
17
a
,
17
b
respectively installed at the upper portion and the lower portion of the anode body
12
of the anode unit
11
and forming a lock down circuit.
Inside the housing
19
a cooling pin
18
is installed at the circumference of the anode body
12
of the anode unit
11
. It has a wave structure and forms an air-cooling structure inside the housing
19
by being assembled in a plurality of layers uniformly arranged at the circumference of the anode body
12
.
The operation of the lighting apparatus using microwave energy in accordance with the background art will now be described.
As depicted in
FIG. 1
, when an operational signal is inputted to the high voltage generator
4
, the high voltage generator
4
boosts the AC power and supplies it to the magnetron
10
.
The magnetron
10
generates microwave energy having a very high frequency by being oscillated by the high voltage supplied from the high voltage generator
4
. The generated microwave energy is emitted inside the resonator
8
through the waveguide
3
, excites the materials enclosed in the bulb
5
and generates light having an inherent emitting spectrum.
The light generated in the bulb
5
collectively reflects toward the front through the reflecting mirror
6
and lightens the adjacent space.
In the process of generating the lumination by microwave energy, heat having a high temperature is generated at the inner side of the anode unit
11
of the magnetron
10
, and this heat is transmitted to the housing
19
through the cooling pins
18
. Also, part of the heat is radiated inside the casings
1
,
2
.
The cooling fan
9
b
is rotated by the motor
9
c
and air which is drawn in from the outside through the suction hole
2
a
of the rear casing
2
cools the magnetron
10
and the casings
1
,
2
. The air which cools the magnetron
10
is discharged to outside through the outlet
1
a
of the front casing
1
.
However, in the lighting apparatus using microwave energy in accordance with the background art, because the fan motor
9
c
and the cooling fan
9
b
installed in order to cool down the magnetron
10
are noisy, it is undesirable to use such a device in spaces which require calm and quiet lighting such, as an office and in the home, etc.
In addition, when the lighting apparatus using microwave energy in accordance with the background art is installed at outside, impurities such as bugs and dust can be drawn into the casings
1
,
2
through the suction hole
2
a
and the outlet
1
a
, covering the internal parts of the apparatus with dust and the dead bodies of bugs. In such cases, the impurities may affect the electric circuits or operational elements of the system causing mechanical problems.
In addition, in lighting apparatus using microwave energy, in accordance with the background art, because the cooling pins
18
are placed inside the magnetron
10
and the fan housing
9
a
, the cooling fan
9
b
and the fan motor
9
c
are installed at the rear of the casings
1
,
2
, making the structure of the lighting system intricate, and increasing the volume or size of the lighting system such that it occupies much space.
SUMMARY OF THE INVENTION
In order to solve the above-mentioned problems, it is an object of the present invention to provide a lighting system using microwave energy which is capable of being used in circumstances requiring a low noise, by reducing the occurrence of noise caused by the fan and fan motor by irradiating the heat generated in the magnetrons by providing a heat pipe having good heat conductivity between the magnetron and a casing, etc. without using the fan and the fan motor.
In addition, it is another object of the present invention to provide a lighting apparatus using microwave energy which is capable of improving the reliability of a lighting system by sealing a casing hermetically so as to prevent penetration of impurities such as bugs and dust by constructing a lighting apparatus so as to radiate heat outside of the casing by a heat transfer method.
In order to achieve the above-mentioned objects, a lighting system using microwave energy in accordance with the present invention includes a microwave generator installed inside a casing and generating microwave energy, a waveguide for transmitting the microwave energy oscillated by the microwave generator, a resonator for covering the outlet of the waveguide, cutting off any leakage of the microwaves and passing light, a bulb placed inside the resonator for generating light by the microwave energy transmitted through the wavegu
Lee Wilson
LG Electronics Inc.
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