Optics: image projectors – Cabinet encloses projector and one side of screen
Reexamination Certificate
2002-08-12
2003-09-23
Adams, Russell (Department: 2851)
Optics: image projectors
Cabinet encloses projector and one side of screen
C353S100000, C353S015000
Reexamination Certificate
active
06623128
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a projection display device such as a projection television, and more particularly to an apparatus for fixing an optical system for use in a projection display device which can absorb vibrations from a cabinet which secures and supports the optical system, the vibrations being caused, for example, by an increase in the audio output of speakers associated with the projection display device, thereby preventing the optical system from vibrating or shaking, and ultimately preventing the images and/or pictures generated by the optical system from vibrating or shaking. The present application is based on Korean Patent Application No. 2001-79996, filed Dec. 17, 2001, which is incorporated herein by reference.
2. Description of the Related Art
A projection display device such as a projection television is an apparatus of a type which generates an image or a picture through liquid crystal display (LCD) elements and the like, and then magnifies and projects or images the image or picture on a large-sized screen through a projection lens. Because the large picture of the projection television is satisfying to the consumer, the demand for projection televisions is increasing.
As schematically shown in
FIG. 1
, a general projection television comprises an optical system
30
disposed on a cabinet
20
in a lower part of casing
10
to selectively transmit light beams generated from a light source through LCD elements, thereby to generate an image and to magnify and project it through a projection lens, a reflecting mirror
40
mounted slantingly at a given angle on an upper part of the rear side of the casing
10
to reflect the image magnified through the optical system
30
toward the front, and a screen
50
disposed at an upper part of the front side of the casing
10
facing the outside of the television so as to transmit or image the image reflected from the reflecting mirror
40
.
Due to the critical nature of the operation of the optical system
30
for forming and magnifying an image in the projection television, even a small change in the position of the optical system
30
can have a large effect on the picture which is formed on the screen
50
. Accordingly, to prevent the position of the optical system
30
from changing when the projection television is transported or moved, the optical system
30
is fixed to the cabinet
20
forming the casing
10
by means of an apparatus
60
for fixing the optical system
30
.
As shown in
FIG. 1
, the apparatus
60
for fixing the optical system
30
comprises a bracket
62
for supporting and mounting the optical system
30
having a hanger
64
horizontally protruding from a lower part of one side thereof and a fixed end
66
protruding downwardly from the other side thereof, a hanger-receiving groove
22
formed at a portion of the cabinet
20
opposite to the hanger
64
of the bracket
62
to receive it, and screws
68
for fixing the fixed end
66
of the bracket
62
to a portion of the cabinet
20
opposite thereto. On the bracket
62
, the optical system
30
is fixed by means of screws and the like. Generally, the optical system
30
is composed of a main projecting part
32
having a lamp, cathode ray tube mirrors for respectively reflecting red, green and blue beams constituting three primary colors from light emitted from the lamp, a LCD panel for forming a desired image by combining the beams reflected from the respective cathode ray tube mirrors, and a projecting lens for magnifying the image formed on the LCD panel, a circuit substrate part
34
for controlling the components such as the lamp, the LCD panel and the like of the main projecting part
32
, and a power supplying part
36
, such as a transformer, for supplying electric power to the circuit substrate part
34
.
Thus, in the conventional apparatus
60
for fixing the optical system
30
, the bracket on which the optical system
30
is mounted is fixed to the cabinet
20
by first inserting the hanger
64
into the hanger-receiving groove
22
and then screwing the fixed end
66
thereto, so that the optical system
30
is fixedly maintained in position, particularly in transporting or moving of the projection television.
However, in the projection television, since speakers
70
are installed on the cabinet
20
, the conventional apparatus
60
for fixing the optical system
30
presents a phenomenon that the cabinet
20
together with the bracket
62
fixed thereon is trembled by vibrations of the speakers
70
.
When the bracket
62
is vibrated by the vibrations of the speakers
70
, the optical system
30
for forming the image and projecting it is in turn vibrated, thereby resulting in a vibration of the picture which is reflected through the reflecting mirror
40
from the optical system
30
to be imaged on or transmitted through the screen
50
. Therefore, the ultimate picture of the projection television is vibrated. As a result, if the user controls the volume of sound produced by the speakers to be at a high level, the performance of the projection television deteriorates.
SUMMARY OF THE INVENTION
Therefore, it is an object of the present invention to provide an improved apparatus for fixing an optical system for use in a projection display device having a large picture and high tone quality, which can not only prevent the position of the optical system from varying during transporting or moving of the projection display device, but can also prevent the picture form vibrating or shaking as a result of a change or difference in the volume of sound produced by the speakers in the projection display device.
This and other objects are provided, according to the present invention, by an apparatus for fixing an optical system for use in a projection display device having a cabinet forming a casing, and an optical system disposed on the cabinet for forming an image and magnifying and projecting the image, comprising a bracket for mounting the optical system; a first vibration-absorbing connector having at least one projection formed at one among one side portion of the bracket and a first counter-portion of the cabinet opposite to the one side portion of the bracket, at least one projection-receiving part for receiving the projection formed at the other among the one side portion of the bracket and the first counter-portion of the cabinet, and at least one first vibration-absorbing member for absorbing vibrations from the cabinet disposed between the projection and the projection-receiving part; and a second vibration-absorbing connector for fixing the other side portion of the bracket to a second counter-portion of the cabinet opposite to the other side portion of the bracket, having a second vibration-absorbing member for absorbing the vibrations from the cabinet interposed between the other side portion of the bracket and the second counter-portion of the cabinet. Also, the second vibration-absorbing connector further includes an intermediate fixing member having a portion directly fixed to the second counter-portion of the cabinet by means of a fixing part, and another portion disposed to be in contact with the second vibration-absorbing member so as to press it against the other side portion of the bracket. Alternatively, the first vibration-absorbing connector can further include at least one elastic supporting member for preventing a direct contact between the one side portion of the bracket and the first counter-portion of the cabinet from being formed.
In a preferred embodiment, the first vibration-absorbing member is formed of a rubber tube formed to wrap the projection and having one end formed in the form of a hemisphere, and the second vibration-absorbing member is formed of a rubber plate attached to the other side portion of the bracket in a contact portion between the bracket and the intermediate fixing member. Also, it is preferable that the fixing part is formed of screws or rivets.
The intermediate fixing member is formed of a plate having at least two
Adams Russell
Nguyen Michelle
Samsung Electronics Co,. Ltd.
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