Information
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Patent Grant
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6758583
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Patent Number
6,758,583
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Date Filed
Monday, March 25, 200222 years ago
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Date Issued
Tuesday, July 6, 200420 years ago
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Inventors
-
Original Assignees
-
Examiners
Agents
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CPC
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US Classifications
Field of Search
US
- 362 294
- 362 345
- 362 373
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International Classifications
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Abstract
A light source cooling system having a double exhaust fan for a projector comprising: a light source formed with an interior region and an exterior region; a first exhaust fan; and a second exhaust fan, wherein the first exhaust fan and the second exhaust fan form two airstreams in the interior region and the exterior region respectively for cooperatively cooling the light source.
Description
BACKGROUND OF INVENTION
1. Field of the Invention
The present invention relates to a projector, and more particularly to a light source cooling system having a double exhaust fan for a projectores.
2. Description of the Related Art
As the technology of projectors progresses, the power of the light sources of projectors appeared on the market is getting higher so that brighter images can be displayed on larger screens for bigger audiences. A prior art projector has a light source of 270 W that involves a problem in heat dissipation. A single exhaust fan of high rotation speed is used for cooling the light source in the prior art projector and results in an entire projector of a high noise level of 39 dB that can make users feel uncomfortable. Moreover, the high rotation speed of the exhaust fan implies a short life of the exhaust fan.
To resolve the above mentioned problem and disadvantage of the prior art projector, the inventor of the present invention got an inventive idea of providing a double fan of low rotation speed in a projector and proved by experiment that the noise level of the entire projector can be reduced to 32 dB by implementation of the inventive idea, in other words, compared with the noise level of the prior art projector, a reduction of 7 dB can be achieved. It can be understood by those of ordinary skill in the art that for every reduction of 3 dB, the noise energy consumed is half reduced and a reduction of 7 db means the noise energy consumed is reduced to less than one fourth. Obviously, an outstanding improvement can be achieved by use of the invention.
SUMMARY OF INVENTION
An object of the invention is to provide a light source cooling system having a double exhaust fan for a projector, wherein the operational rotation speed of the double exhaust fan, which has the rated highest speed of 4,800 r.p.m., is only about 2,400 r.p.m., i.e., only about a half of its rated highest speed and thereby the noise level of the projector is relatively low.
Another object of the invention is to provide a light source cooling system having a double exhaust fan for a projector, wherein the operational rotation speed of the double exhaust fan, which has the rated highest speed of 4,800 r.p.m., is only about 2,400 r.p.m., i.e., only about a half of its rated highest speed and thereby the life the double exhaust fan can be relatively long.
To achieve the above and other objects, the present invention provides a light source cooling system having a double exhaust fan for a projector comprising: a light source formed with an interior region and an exterior region; a first exhaust fan; and a second exhaust fan, wherein the first exhaust fan and the second exhaust fan form two airstreams in the interior region and the exterior region respectively for cooperatively cooling the light source.
BRIEF DESCRIPTION OF DRAWINGS
The above and other objects, advantages, and features of the present invention will be understood from the following detailed description of the invention when considered in connection with the accompanying drawing below.
FIG. 1
is a schematic view showing a light source cooling system having a double exhaust fan for a projector in accordance with a preferred embodiment of the invention.
DETAILED DESCRIPTION
Referring to
FIG. 1
, a light source cooling system in accordance with a preferred embodiment of the invention comprises a light source
10
installed in a projector (not shown), two axial exhaust fans
20
and
30
attached to the case
50
of the projector, and a blower
40
installed in the projector. In the preferred embodiment, the thickness of the projector is, e.g., 80 mm, the size of both axial exhaust fans
20
and
30
is 70×70×20 mm, and the power of the light source
10
is 270 W.
The light source
10
has an outer reflector surface
12
and a light core
11
provided in the interior thereof. The exhaust fan
20
is adjacent the front end of the light source
10
and the exhaust fan
30
is adjacent the rear end of the light source
10
. In front of the light source is provided a blower
40
. The outlet of the blower
40
faces the light core
11
.
A partition plate
60
separates the airflow for cooling the light source into two airstreams
80
and
90
, wherein the airstream
80
generated by the exhaust fan
20
and the blower
40
is for cooling the light core
11
of the light source
10
, and the airstream
90
that will pass through the exhaust fan
30
is for cooling the outer reflector surface
12
of the light source
10
. It can be proved by experiment that the heat amount carried away, by the airstream
80
, from the light core
11
of the light source
10
is about the same as that carried away, by the airstream
90
, from the outer reflector surface
12
of the light source
10
. Due to that two exhaust fans
20
and
30
are used in the projector, they only need a rotation speed of 2,400 r.p.m. to achieve a desirable cooling effect on the light source
10
. In addition, it can be proved by experiment that the noise level of the entire projector can be reduced to 32 dB, in other words, compared with the noise level of the prior art projector, a reduction of 7 dB can be achieved. It can be understood by those of ordinary skill in the art that for every reduction of 3 dB, the noise energy consumed is half reduced and a reduction of 7 db means the noise energy consumed is reduced to less than one fourth. Obviously, an outstanding improvement can be achieved by use of the invention. Moreover, the operational rotation speed of the exhaust fans
20
and
30
is only about 2,400 r.p.m. instead of 4,800 r.p.m. (i.e., the rated highest rotation speed of the fans), thereby the exhaust fans
20
and
30
can have a relatively long life.
While a preferred and particular embodiment of the present invention have been described herein for purposes of illustration, many modifications and changes will become apparent to those skilled in the art. Accordingly, the appended claims are intended to encompass all such modifications and changes as fall within the true spirit and scope of this invention.
Claims
- 1. A light source cooling system having a double exhaust fan for a projector comprising:a light source formed with an interior region and an exterior region; a blower which has a outlet facing the interior region; a first exhaust fan which is adjacent a front end of the light source; and a second exhaust fan which is adjacent a rear end of the light source; wherein the blower cooperatively operates with the first exhaust fan to generate a first airstream for cooling the interior region, the second exhaust fan forming a second airstream for cooling the exterior region.
Priority Claims (1)
Number |
Date |
Country |
Kind |
90122039 A |
Sep 2001 |
TW |
|
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
6419364 |
Takizawa et al. |
Jul 2002 |
B2 |
6443575 |
Miyamoto et al. |
Sep 2002 |
B1 |
6488378 |
Tabuchi et al. |
Dec 2002 |
B1 |