Television – Video display – Cabinet or chassis
Reissue Patent
1998-06-18
2001-08-21
Lee, Thomas D. (Department: 2624)
Television
Video display
Cabinet or chassis
C348S825000, C361S752000, C361S760000
Reissue Patent
active
RE037332
ABSTRACT:
THE BACKGROUND OF THE INVENTION
This invention relates to an image display device having a casing within which a television device and a video device are enclosed.
In
FIGS. 1 and 2
are illustrated a conventional image display device having a casing within which a television device and a video device are enclosed. The video device
1
placed on a bottom plate
2
a of a casing
2
, as shown in
FIG. 2
, is secured at the front portion thereof to a front plate
2
b of the casing
2
and at the rear portion thereof to a rear cabinet by means of screws
3
, respectively.
The video device
1
includes a chassis
1
a secured to a casing
1
b of a molded plastic material. As shown in
FIG. 2
, a plurality of printed circuit boards
4
of the video device
1
are arranged at a rear portion of the chassis
1
a or casing
1
b.
A printed circuit board
5
of the TV device is disposed along one of the inner side surfaces of the casing
2
, which bears a power supply circuit for the TV device including a high frequency transformer
6
for high voltage circuit. On one of the printed circuit boards
4
is provided separately a power supply circuit for the video device (not shown).
In
FIG. 1
, numeral
7
depicts a shield plate disposed above the video device
1
.
As described above, the prior art image display device has a construction that the video device is inserted into the casing of the TV device and secured in position. Such construction, however, requires extremely large numbers of long wirings for connecting the printed circuit boards for the TV and video circuits. In addition, it takes a lot of time and labor to install the printed circuit boards for the TV and video circuits.
Furthermore, since the power supply circuits are provided separately for the TV and video circuits, it is necessary to install a large number of parts therefor. A further disadvantage is that noises generated from the power supply circuit for the TV circuit would be transmitted to the video device.
OBJECTS OF THE INVENTION
It is an object of this invention to provide an image display device having a TV and video device in a common casing, which eliminates the disadvantages as described above.
SUMMARY OF THE INVENTION
According to this invention, there is provided a display device having a casing in which a television device and a video device are enclosed, comprising:
a main circuit board having a first area for installing electronic parts of an electron beam controlling circuit for a CRT and a power supply circuit for said television device and electronic parts of a power supply circuit for said video device, and a second area for installing electronic parts of said television device except for said electron beam controlling circuit and said power supply circuit for said television device and electronic parts of said video device except for said power supply circuit for said video device; and
terminals for commercial AC power sources and terminals for said electron beam controlling circuit for CRT provided within said first area of said main circuit board.
According to this invention, since the electronic parts of the power supply circuit are arranged within a separated area formed on the main circuit board, the electronic parts for the TV device and the electronic parts for the video device can be installed with high density. For such arrangements, the TV and video circuits can be prevented from being subjected to interference from the power supply circuit, such as electrical noises, magnetic field and heat. Therefore, the shield for protecting the TV and video circuits from such influences can be eliminated.
In a preferred embodiment of this invention, the electronic parts of the power supply circuit arranged in the first area are commonly used for the television device and the video device, thereby reducing the number of necessary parts and overall size, compared to the conventional image display device.
It is preferable that electrical connection between the circuits for the television device and for the video device be done by a printed circuit, resulting in noise-free connection with a compact arrangement.
Preferably, the power supply circuit comprises a switching regulator circuit having a high frequency transformer arranged in such manner that a plane including a core gap of the transformer is disposed substantially in parallel with the surface of the main circuit board, thereby reducing the noise from the transformer to be picked up by the rotary video head.
Further features and advantages of the present invention will be apparent from the following description taken with reference to the accompanying drawings.
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Higuchi Yoshio
Okada Kazuyuki
Funai Electric Co. Ltd.
Lee Thomas D.
Morgan Lewis & Bockius
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