Electric lamp and discharge devices: systems – Pulsating or a.c. supply – Induction-type discharge device load
Reexamination Certificate
2002-04-11
2003-12-09
Wong, Don (Department: 2821)
Electric lamp and discharge devices: systems
Pulsating or a.c. supply
Induction-type discharge device load
C315S039000
Reexamination Certificate
active
06661183
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a lighting apparatus using microwave and particularly, to an apparatus and method for intercepting leakage of microwave which intercepts microwave leaked by a damage in a resonator in the lighting apparatus.
2. Description of the Background Art
Generally, the apparatus using a microwave is an apparatus for generating visible rays or ultraviolet rays by applying microwave to an electrodeless bulb. The electrodeless bulb in the lighting apparatus has longer life span than that of incandescent lamp or fluorescent lamp which is generally used and has higher lighting effect.
FIG. 1
is a view showing a composition of a conventional lighting apparatus using microwave.
As shown in
FIG. 1
, the conventional lighting apparatus using microwave includes a magnetron
17
positioned in a case
16
of the lighting apparatus, for generating microwave, a high voltage generator
18
for supplying an alternate current power source into the magnetron
17
after raising the voltage into a high voltage, a waveguide
15
for inducing microwave from the magnetron
17
, an electrodeless bulb
14
for generating light by absorbing -energy of the microwave induced by the waveguide
15
, a resonator
12
covered on the front side of the electrodeless bulb
14
, for intercepting the microwave and passing the light generated from the electrodeless bulb
14
, a reflector
11
for reflecting the light from the resonator
12
to be directly moved, a mirror
13
positioned at the lower portion of the resonator
12
, for passing the microwave and reflecting the light and a cooling fan
21
installed at the lowermost portion of the case
16
, for cooling the magnetron
17
and high voltage generator
18
. Here, the electrodeless bulb
14
is made of quartz or ceramic and includes an emitting unit
14
A in which luminescent material is sealed to emit light by the microwave and a bulb stem
14
B combined with the emitting unit
14
A and lengthened to the inner side of the waveguide
15
. Also, the resonator
12
is formed as a cylindrical shape with an end opened in a mesh structure, to be connected with the waveguide
15
by having the opened part being covered on the electrodeless bulb
14
. Also, in the conventional lighting apparatus using microwave, a bulb motor
19
for rotating the electrodeless bulb
14
and a fan motor
20
for driving the cooling fan
21
are further installed.
Hereinafter, the operation of the conventional lighting apparatus using microwave will be described as follows.
First, a control unit (not shown) outputs a driving signal into the high voltage generator
18
. At this time, the high voltage generator
18
raises the voltage of the alternate current and supplies the raised voltage into the magnetron
17
.
The magnetron
17
generates microwave by blistering by the high voltage supplied from the high voltage generator
18
and emits the generated microwave into the waveguide
15
. Here, the microwave is emitted to the inside of the resonator
12
, generates light having a specific discharge spectrum by emitting the luminescent material sealed in the electrodeless bulb
14
and the light is reflected to the front side by the reflector
11
and the mirror
13
lighting the space.
Then, the control unit cools heat of the high voltage generator
18
, magnetron
17
and the electrodeless bulb
14
by driving the bulb motor
19
and fan motor
20
when the high voltage generator is driven, to prevent the magnetron from being overheated by generating heat by itself.
However, the conventional lighting apparatus using microwave has some problems that it damages the circumstance leaking the microwave through the damaged when the resonator
12
is damaged by an unexpected reason or high heat generated in the electrodeless bulb
14
.
Also, the conventional lighting apparatus using microwave has a problem that safety of a user is hindered since the microwave is leaked to outside if the resonator
12
is operated under the condition that it is damaged.
SUMMARY OF THE INVENTION
Therefore, the present invention provides an apparatus and method for intercepting leakage of microwave, capable of preventing a fire by leakage of microwave and securing safety of a user by intercepting microwave leaked from a resonator of a lighting apparatus using the microwave.
To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described herein, there is provided an apparatus for intercepting leakage of microwave, including an electrodeless bulb for generating light by microwave generated from a magnetron, a sensing unit installed outside the resonator for intercepting the microwave, for passing light generated in the electrodeless bulb and outputting a corresponding sensing signal by sensing at real time whether the microwave is leaked and a control unit for turning on or off a power supplied to the magnetron by the sensing signal.
To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described herein, there is provided a method for intercepting leakage of microwave, including the steps of generating a corresponding current detection signal by detecting current applied to a magnetron, generating a corresponding optical detection signal by detecting the light from the electrodeless bulb for generating light by microwave outputted from the magnetron and intercepting a power supplied to the magnetron by sensing whether the microwave is leaked on the basis of the current detection signal and optical detection signal.
The foregoing and other, features, aspects and advantages of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
REFERENCES:
patent: 5847517 (1998-12-01), Ury et al.
patent: 5977712 (1999-11-01), Simpson
patent: 6046545 (2000-04-01), Horiuchi et al.
patent: 6577074 (2003-06-01), Ervin et al.
patent: 2002/0030453 (2002-03-01), Kirkpatrick et al.
Hea Hyoun-Soo
Park Chang-Sin
LG Electronics Inc.
Ostrolenk Faber Gerb & Soffen, LLP
Tran Thuy Vinh
Wong Don
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