Cooling apparatus for projector casing

Optics: image projectors – Temperature control – Blower

Reexamination Certificate

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Details

C353S060000, C362S264000, C362S294000

Reexamination Certificate

active

06742899

ABSTRACT:

BACKGROUND OF INVENTION
1. Field of the Invention
The present invention relates to a projector, and more particularly, to a cooling apparatus for projector casing for shielding the radiant heat.
2. Description of the Prior Art
In general, a projector usually uses a high power light bulb as the light source to provide a bright and clear image and offer a comfortable viewing environment for audiences, and thus turning the light bulb into the largest heat source of the projector. The temperature of the upper and lower casings adjacent to the light bulb is higher than the temperature at other parts of the casings. To assure the user's safety and improve the product quality, prior-art projectors usually use fans to cool and reduce the temperature of the casing.
Please refer to
FIG. 1
for a projecting light source
10
of a conventional projector, which comprises a light bulb
11
coupled to a lamp holder
13
by a movable fixture
12
, and the lamp holder
13
being fixed to a lower casing
15
, by a screw
14
; wherein an upper casing
16
of the projector being disposed at a position as close as possible to the lamp
11
to minimize the thickness of the projector and meet the consumer's requirements for a modern compact equipment. Therefore, although there is a cooling fan (not shown in the figure) on one side of the lamp
11
, the lamp at its top has no shelter. Therefore, the upper casing
16
and the lamp holder
13
adjacent to the lamp
11
will still be heated up by the radiant heat and hot air produced by the high temperature of the lamp
11
, and conducted through the lamp holder
13
to the lower casing
15
near the lamp holder
13
, causing the temperature of the upper and lower casings of the projector near the light source
10
higher than the temperature of other parts of the casing. It does not only heat up the plastic casing to a high temperature, but also expedites the deterioration; even for metal casings, it will also produce heat of high temperature, which makes the use of projector unsafe and inconvenient.
In
FIG. 2
, it shows another light source
20
of a conventional projector, wherein a lamp
21
being coupled to a lamp holder
22
; a lamp housing
23
being disposed inside the projector; the lamp holder
22
being placed and coupled into the lamp housing
23
from the bottom of the lamp housing through a slot (not shown in the figure) of the lower casing
25
; and a fan
24
being disposed on one side of the lamp housing for cooling the lamp
21
. Although a cover
231
not fully closed is disposed at the top of the lamp housing
23
for shielding the lamp
21
from directly lighting up the upper casing
26
, the cover
231
of the lamp housing
23
closely attaches onto the upper casing
26
of the projector. Therefore, the radiant heat of the lamp
21
will still be conducted through the cover
231
and the lamp holder
22
to the upper and lower casings
25
,
26
. There is a gap between the cover
231
and the upper casing
26
due to the error of manufacturing or assembling, but it does not constitute an air duct for the airflow. The air in the gap remains still and is heated up continuously, which also ends up a high temperature it causes the temperature at the upper and lower casings adjacent to the light source
20
higher than other parts of the housing, and thus having the shortcoming of making the application of the projector unsafe and inconvenient.
SUMMARY OF INVENTION
The objective of the present invention is to provide a cooling apparatus for projector casing by using a sheet as a shielding for the radiant heat and facilitating the airflow to isolate the radiant heat and the hot air of high temperature near the lamp in order to reduce the temperature of the casing and improve the quality of the product.
To achieve the foregoing objective, the present invention comprises a lamp holder with a lamp inside a casing; at least one guiding surface at the lower edge proximate one side of the lamp holder; an ventilation outlet disposed on the lamp holder at a position corresponding to one side of the guiding surface proximate the casing; an upper sheet at the top of the lamp holder keeping a specific distance from the casing to define an upper air duct; a lower sheet at the bottom of the lamp holder keeping a specific distance from the casing to define a lower air duct and connecting to the guiding surface for installing a fan proximate one side of the guiding surface in order to blow the air through the lamp holder and the upper and lower air ducts and then discharge the hot air from the ventilation outlet for the heat dispersion.


REFERENCES:
patent: 4925295 (1990-05-01), Ogawa et al.
patent: 5287132 (1994-02-01), Suzuki et al.
patent: 5722753 (1998-03-01), Okada et al.
patent: 5842761 (1998-12-01), Futakami et al.
patent: 6004010 (1999-12-01), Inage et al.
patent: 6283614 (2001-09-01), Okada et al.
patent: 6398366 (2002-06-01), Hara et al.
patent: 6494581 (2002-12-01), Shimizu
patent: 6575599 (2003-06-01), Imamura et al.

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