JP3223662B2 - Projection TV shielding structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shielding structure for shielding a screen portion from a chassis in a projection television so that the inner surface of the screen is not dusted.

[0002]

2. Description of the Related Art FIG. 5 is a sectional view showing a shielding structure in which a chassis and a screen of a conventional projection television are shielded by a shielding plate. In the figure, 1 is a lens, 2 is a CRT, 3 is a bracket for mounting and holding these lenses 1 and 2, 4 is a back cover mounted on a cabinet, 5 is a shielding plate, made of an iron plate and made of anti-reflection. It has a black matte paint for it. Reference numeral 6 denotes a mounting bracket mounted on the cabinet for mounting the shielding plate 5, 7 a screw for mounting the shielding plate 5, and 8 and 9 affixed to the bracket 3, the shielding plate 5, and the shielding plate 5 and the back cover part 4, respectively. It is a cushion of cushioning material.

[0003] Next, a shielding plate 5 designed to eliminate the gap between the bracket 3 and the back cover 4 attached to a predetermined position of the cabinet has a front portion mounted on the bracket 3 and a rear mounting portion. Is attached to the mounting bracket 6 with the screw 7. At this time, a slight gap is generated due to the variation of each part.
And between the shielding plate 5 and the back cover 4, cushioning materials such as cushions 8 and 9 are attached to prevent gaps.

[0004]

Since the shielding structure of the conventional projection television is configured as described above, when developing models having different screen sizes,
It is necessary to recreate a new shielding plate 5 having a different size, and there is a drawback that the mold cost of the shielding plate 5 increases. Further, the number of types of shielding plates 5 is increased and standardization cannot be performed, so that the cost is disadvantageously increased. Also, since the shielding plate 5 is made of an iron plate, it absorbs variations in dimensions and eliminates gaps.
A difficult score and is, because I lost the gap by attaching a buffer material such as cushion 8 and 9 parts and work there is an increased cost is also high disadvantage for it. Further, since the shielding plate 5 is made of an iron plate, it is necessary to apply a black matte coating in order to prevent the reflection of the projection light inside the projection television, and this coating has greatly increased the cost of parts.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. One type of shielding plate can be applied to any number of models and can reduce the cost. It is an object of the present invention to obtain a shielding structure for a projection television that can perform internal reflection and prevent internal reflection.

[0006]

According to the present invention, there is provided a shielding structure for a projection television in which one rib of a shielding plate is inserted into a bracket of a projection tube unit and the other is connected to a cabinet or a back cover, and a shape is formed therebetween. It is provided with a plurality of bending portions that can be changed.
A U-shaped rib is provided on the other side of the shielding plate, a bar of a cabinet is inserted into the U-shaped rib, and a convex portion is provided on an inner surface of the U-shaped rib so that the rib can be pressed. is there. A soft bellows portion is provided at a portion to be fitted to the other back cover portion of the shielding plate. A fine uneven shape is provided on the screen side surface of the shielding plate.

[0007]

In the present invention, since a plurality of bent portions are provided between the bracket fixing side of the shielding plate and the fixing portion of the bar of the cabinet, the dimensions in the depth and vertical directions can be changed even for models having different dimensions. Therefore, the chassis and the screen can be shielded by the same shielding plate, and there is no need to manufacture a shielding plate for each model. Also, since the cabinet fixing part of the shielding plate is received with a U-shaped rib, the chassis part and the screen part can be shielded just by inserting and fixing the bar of the cabinet, and there is no screw fixing because it is pressed against the convex part. Can be combined to improve workability.

Further, since a soft bellows portion is provided on the back cover fixing portion of the shielding plate, the rib is pressed against the rib portion of the back cover without using a cushioning material such as a cushion. Can shield. Further, since the shielding plate is an extruded product, fine irregularities are provided on the surface to make the color of the resin black, so that the projection light reflects irregularly when it hits the plate, so that the influence on the screen can be minimized.

[0009]

【Example】

Embodiment 1 FIG. An embodiment of the present invention will be described below with reference to the drawings. 1 is a cross-sectional view, FIG. 2 is a perspective view showing the shielding plate of FIG. 1, and FIG. 3 is a cross-sectional view showing another use state. In FIG. Omitted.

[0010] In FIG, 10 is a shielding plate made of a resin material, a screw 12 to the mounting bracket 11 of the cabinet, screw holes
12A . Reference numeral 13 denotes a rib portion provided on one side of the shielding plate 10 and inserted into the bracket 3 of the projection tube unit. The rib portion 13 is slightly smaller than the thickness of the bracket 3 and is pressed into the bracket 3 so that there is no gap between the screws 14. ,
It is fixed to the bracket 3 by the screw hole 14A . Reference numeral 15 denotes a U-shaped rib provided on the other side of the shielding plate 10 and is fitted to a bar 16 of the cabinet. This U-shaped rib 15
A convex portion 17 is provided on the inside of the bar so that no gap can be formed even if the thickness of the bar 16 varies. Reference numeral 18 denotes a plurality of bent portions formed in the middle of the shielding plate 10 at which the shielding plate 10 can be bent and changed.

The U-shaped rib 15 of the shielding plate 10 is
The mounting of the shielding plate 10 is completed by mounting the shielding plate 10 by fixing the mounting plate 11 to the mounting bracket 11 with screws 12 and inserting one of the ribs 13 into the bracket 3 and fixing with the screws 14. At this time, when the interval between the bar 16 and the bracket 3 is small as shown in FIG. 1, the bar 16 is largely bent at the bent portion 18 as shown in FIG.
When the distance between the bracket 3 and the bracket 3 is large, the bent portion 18 does not bend so much and corresponds to each.

If the other side of the shielding plate 10 is formed into a U-shaped rib 15 and a convex portion 17 is provided inside the U-shaped rib 15 as in the above-described embodiment, the other side of the shielding plate 10 becomes a cabinet. Only needs to be inserted into the bar 16 of the
Since it is pressed by 7, screwing becomes unnecessary.

Embodiment 2 FIG. In this embodiment, a soft bellows portion 19 is provided between the U-shaped rib 15 and the U-shaped rib 15 as shown in FIG. When the soft bellows portion 19 is provided in this manner, the U-shaped rib 15 is constantly brought into a press-contact state, so that the gap cannot be formed.

Embodiment 3 FIG. In each of the above embodiments, by making the surface of the shielding plate 10 on the screen portion side finely irregular, unnecessary projection light is irregularly reflected, and the influence of the projection light on the screen can be reduced.

[0015]

As described above, according to the present invention, since there is a bent portion whose shape is variable, it can be adapted to various dimensions. Therefore, the same components can be used without designing a shielding plate every time the layout of the model changes as in the related art. Also, since the U-shaped rib is press-fitted into the fitting part of the bar of the cabinet, no gap is generated, and the soft bellows part is compressed and pressed, so in any case, It is possible to eliminate the cushion of the cushioning material for preventing the gap due to the dimensional variation of the conventionally used parts. Further, since fine irregularities are formed on the screen side surface of the shielding plate, reflection of the projection light can be reliably and inexpensively prevented at a lower cost than when a black matte coating is applied to the iron plate as in the related art.

[Brief description of the drawings]

FIG. 1 is a sectional view showing Embodiment 1 of the present invention.

FIG. 2 is a perspective view showing the shielding plate of FIG. 1;

FIG. 3 is a sectional view showing another example of use of the first embodiment of the present invention.

FIG. 4 is a sectional view showing a second embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a mounting state of a conventional shielding plate.

[Explanation of symbols]

 Reference Signs List 1 lens 2 CRT 3 bracket 10 shielding plate 11 mounting bracket 12 screw 13 rib portion 14 screw 15 U-shaped rib 16 bar 17 convex portion 18 bent portion 19 soft bellows portion

Claims (4)

(57) [Claims] In a shielding structure in which a chassis and a screen are shielded by a shielding plate in a projection tube unit of a projection television, one rib of the shielding plate is inserted into a bracket of the projection tube unit and the other is inserted. A shielding structure for a projection television, comprising a plurality of bent portions which are connected to a cabinet or a back cover and have a variable shape therebetween. 2. A U-shaped rib is provided on the other side of the shielding plate, a bar of a cabinet is inserted into the U-shaped rib, and a convex portion is provided on an inner surface of the U-shaped rib so that the rib can be pressed. 3. The shielding structure for a projection television according to claim 1, wherein: 3. The shielding structure for a projection television according to claim 1, wherein a soft bellows portion is provided at a portion of the shielding plate to be fitted to the other back cover portion. 4. The projection plate unit is characterized in that projection light is irregularly reflected by providing fine uneven lines on the surface of the shielding plate so that the projection light from the projection tube unit is not reflected on the surface of the shielding plate. A shielding structure for a projection television according to claim 1.