JPH021992Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a filter that is attached to the front of a television receiver or the like.

[Background technology and its problems]

When the surface of a cathode ray tube in a television receiver or the like is illuminated by strong external light, all bright spots on the cathode ray tube that are less than the brightness of the external light are masked, the black level portion is crushed and becomes invisible, and the contrast ratio decreases. Therefore, it is effective to attach a filter to the front of the television receiver or the like in order to compensate for this decrease in contrast ratio.

In the past, such filters were made of glass, but these days, they are often made of synthetic resin such as acrylic because of their low cost and ease of manufacture.

However, since the see-through part of the filter is formed into a plate shape, a flange part that goes around the back side is provided to give the see-through part enough strength to prevent it from deforming, and a mounting part for attaching it to a television receiver etc. is also provided. be. Then, it is necessary to coat the surface of the filter with a film of silicon or the like to make it less likely to be scratched.

FIG. 1 is a perspective view showing an example of the conventional filter as described above, FIG. 2 is a sectional view taken along the line A--A in FIG. 1, and FIG. 3 is an explanatory diagram when coating a film.

In these figures, 1 is a filter molded from a synthetic resin such as acrylic, and includes a plate-shaped transparent part 2, a flange part 3 provided around the back surface at a nearly right angle to reinforce this transparent part 2, and This flange part 3
A coating 6 of silicon or the like is formed on the surface of the transparent part 2 to a thickness of 1 to 2 .mu.m. In addition,
4 is a corner portion formed by the transparent portion 2 and the flange portion 3, and H is a holder for holding the claw 5 when coating the filter 1 with the film 6.

Next, the operation of coating the filter 1 with the film 6 will be explained.

First, the claws 5 at the top of the filter 1 are held by the holders H, and the filter 1 is hung vertically as shown in FIG. Then, the filter 1 is immersed in a coating tank (not shown) containing a coating liquid, and the film 6 is coated on the filter 1.
However, since the transparent part 2 and the flange part 3 are arranged at almost right angles, after the filter 1 is lifted from the coating tank, excess coating liquid accumulates in the lower corner part 4, and the coating 6 in this part has a thickness of about 0.2 mm. This will make it easier for cracks to occur. If a crack occurs, it also affects the coating 6 of the transparent part 2. Therefore, there is a problem that a good filter 1 cannot be obtained.

[Purpose of invention]

This invention was made in view of the above points, and is intended to provide a filter that prevents the coating liquid from accumulating in the corners, has a uniform coating, and is less prone to cracks.

[Summary of the idea]

In order to achieve the above-mentioned purpose, this invention provides a rounded corner at least at the corner formed by the transparent part located below and the flange part when the filter is suspended, and also makes it possible to see through the inner peripheral surface of the flange part. The flange has an inclined surface that approaches the outer circumferential surface of the flange as it moves away from the flange.

〔Example〕

FIG. 4 is an enlarged sectional view showing an embodiment of this invention.

In this figure, reference numeral 11 denotes a filter molded from synthetic resin such as acrylic, which includes a plate-shaped transparent part 12, a flange part 13 that extends around the back surface at an almost right angle to reinforce this transparent part 12, and A mounting claw 15 protruding from the outside of the flange portion 13
A coating 16 made of silicon or the like is formed on the surface of the transparent portion 12 to a thickness of 1 to 2 μm. In addition, 14 is a corner portion formed by the transparent portion 12 and the flange portion 13, and is rounded with a radius of 1 to 10 mm, and 13a is a corner portion formed by the flange portion 13.
The inner peripheral surface of the flange portion 13 is an inclined surface that approaches the outer peripheral surface 13b of the flange portion 13 as it moves away from the transparent portion 12, and its tip is slightly rounded.

Next, the operation of coating the film 16 on the filter 11 will be explained.

As in the conventional case, the upper claws 15 of the filter 11 are each held by a holder H as shown in FIG. 3, and hung vertically. Then, the filter 11 is placed in a coating tank (not shown) containing a coating liquid.
to coat the filter 11 with the film 16.

The filter 11 of this invention has a coating 1 as described above.
When coating the filter 11, the corner portion 14 is rounded, the inner peripheral surface 13a is sloped, and the tip is rounded, so that after lifting the filter 11 from the coating tank, excess coating liquid flows downward. The coating liquid flows down without accumulating in the corner part 14, and the coating liquid drains easily. Therefore, the coating 16 becomes uniform and the coating 1
6, cracks are less likely to occur, and a good filter 11 can be obtained.

In addition, in the above embodiment, the corner portion 14 extends over the entire circumference.
However, when the filter 11 is hung, only the corner portion 14 located at the bottom is rounded, and only the inner peripheral surface 13a located at the bottom is sloped. And it is sufficient. And this inner peripheral surface 13
The inclination of a may be determined by considering the strength of the flange portion 13, and an effect can be obtained with a slight inclination, for example, an inclination of 1 to 10 degrees. Moreover, the same effect can be obtained even if the tip of the inner circumferential surface 13a is not rounded.

[Effect of idea]

As explained above, when the filter of this invention is hung, at least the corners located below are rounded, and the inner peripheral surface of the flange located below is sloped. The coating liquid drains easily. Therefore, the coating becomes uniform and cracks are less likely to occur in the coating, which has the advantage of providing a good filter.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a conventional filter, Fig. 2 is a sectional view taken along line A-A in Fig. 1, Fig. 3 is an explanatory diagram when coating a film, and Fig. 4 is an embodiment of this invention. FIG. In the figure, 11 is a filter, 12 is a transparent part, 13 is a flange part, 13a is an inner peripheral surface, 13b is an outer peripheral surface,
14 is a corner portion, 15 is a claw, 16 is a coating, and H is a holder.

Claims (1)

[Scope of utility model registration request] A filter comprising a see-through part and a flange part that goes around the back surface at right angles to the see-through part, and in which a coating is formed on the surfaces of the see-through part and the flange part by immersing the see-through part and the flange part in a coating bath. When the upper part of the flange part is suspended, at least the corner part formed by the transparent part located below and the flange part is rounded, and the inner circumferential surface of the flange part increases as the distance from the transparent part increases. A filter characterized by having an inclined surface approaching the outer peripheral surface of the filter.