JPS603283A - Manufacture of filter - Google Patents

Abstract

PURPOSE:To prevent the exposure of the cut place which is cut from a locking piece and attain uniform coating on the entire face by prolonging a claw for fitting a filter to use it as a locking piece for hanging at the coating and providing a round at the corner in the filter fitted to the front face of a television receiver or the like. CONSTITUTION:The filter 11 formed by a synthetic resin such as acryl consists of a plate form transparent part 12 and a flange part 13 provided at the rear side circulatingly nearly at a right angle to reinforce the section 12. Further, the claw 15 for fitting is provided at the outside of the flange section 13 and the upper side claw 15 is prolonged and a locking piece 16 for hanging at the coating is provided. Moreover, the corner of an inner circumference face 13a connecting the transparent section 12 and the flange 13 is rounded. Moreover, the locking piece 16 is cut off after a coating film 18 such as silicon is coated to the filter 11.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a filter manufacturing method for manufacturing a filter to be attached to the front surface of a television receiver or the like.

[Background technology and intermediate points]

When the surface of the cathode ray tube is illuminated with strong external light, all the bright spots on the cathode ray tube that are less than the brightness of the external light are masked, and the black level part is crushed and becomes invisible.
The contrast ratio will decrease. Therefore, it is effective to attach a filter to the front of the receiver, etc., in order to prevent this drop in the foundation ratio.

Previously, filters like this were made of glass, but
These days, synthetic resins such as acrylic are often molded 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. The attachment claw is provided on the outside of the flange. In order to prevent the surface of the filter from being scratched, it is necessary to coat it with a film such as silicone.

FIG. 1 is a perspective view showing an example of a conventional filter before being coated with a film, FIG. 2 is a sectional view taken along line A--A in FIG.

In these figures, reference numeral 1 denotes a filter molded from synthetic resin such as acrylic, which includes a plate-shaped transparent part 2 and this transparent part 2'?
A crank part 3 is provided around the back surface at an almost right angle for reinforcement, a mounting claw 5 is provided protruding from the outside of this crank part 3, and one side of the crank part 3 is made of silicone or the like. The coating 8 is composed of a locking piece 6 for hanging provided to coat the fire filter 1 to a thickness of 1 to 2 μm.

In addition, 4 is a part of the corner formed by the transparent part 2 and the crank part 3, 7 is a hole provided in the locking piece 6, and H is a hook that is inserted into the hole 7 and supports the filter 1.

Next, the process of manufacturing a filter for use from the state shown in FIG. 1 will be explained.

First, each hook H is inserted into the hole T of the locking piece 6, and the filter 1' is inserted as shown in FIG. : When suspended, the filter 1 is suspended almost vertically. In this state, the filter 1 is immersed in a coating phase (not shown) containing a coating liquid, and then the filter 1 is lifted and coated with 8 layers. Then, the locking piece 6 is cut from the crank part 3.

Conventionally, as mentioned above, the claw 5 and the hanging locking piece 6 were molded separately, so marks from cutting the locking piece 6 for commercialization remained on the crank part 30 surface, and the filter 1 yj
If it is attached to an R-7''VV image receptor, the cut marks of the locking piece 6 will be exposed and spoil the appearance.Also, since the transparent part 2 and the flange part 3 are formed at almost right angles, After lifting the filter 1 from the coating liquid, excess coating liquid accumulates in the lower corner part 4, and the coating B in this area becomes about 0.2 mm thick, making it easy to crack. Then, if a crank occurs, there is a problem in that it spreads to the coating 8 of the transparent part 2 as well.

[Purpose of the invention]

This invention was made in view of the above points, and it prevents any traces of cutting the locking piece from remaining on the flange portion, and also prevents coating liquid from collecting in a part of the corner, without damaging the appearance. , provides a method for manufacturing a filter that has a uniform coating and is less prone to cranking.

[Summary of the invention]

In order to achieve the above-mentioned intended purpose, this invention has a locking piece that extends to the front of a claw-like transparent part provided on one side of the flange part, and a center of gravity when the locking piece is suspended. Make an acute angle between the perpendicular line passing through and the line extending from the inner circumferential surface of the lower flange part, suspend this locking piece and soak it in the coating liquid, and coat the filter with a film T (after 7 days). The pieces were cut off to make claws.

〔Example〕

Fig. 4 is a perspective view of a filter showing an embodiment of the present invention before being coated with a film, Fig. 5 is a sectional view taken along the line B-B in Fig. 4, and Fig. 6 is an explanation when coating a film. It is a diagram.

In these figures, 11 is a filter molded from synthetic resin such as acrylic, and includes a plate-shaped transparent part 12 and this transparent part 1.
2, a flange portion 13 extending around the back surface at an almost right angle to reinforce the flange portion 13, a mounting claw 15 protruding from the outside of the flange portion 13, and a coating 18 made of silicon or the like.
and a locking piece 16 for hanging provided to coat the filter 11 with a thickness of 1 to 2 μm, and this locking piece 16 is later cut to become a claw 15. In addition, 1
3a is the inner peripheral surface of the crank part 13, which is an inclined surface that approaches the outer peripheral surface 13b of the flange part 13 as it moves away from the transparent part 12, and 14 is a part of the corner formed by the transparent part 12 and the crank part 13. , the roundness of 1 to 10 degrees is provided. and 17 is a hole provided in the locking piece 16;
H is a hook.

Next, a process of manufacturing the filter 11 for use from the state shown in FIG. 4 will be described.

First, when the hooks H are inserted into the holes 17 of the locking pieces 16 and the filter 11 is suspended as shown in FIG. 6, the filter 11 is suspended almost vertically. In this state, the filter 11 is immersed in the coating liquid in the same manner as before to form a coating 18.
After that, attach the locking piece 167 to the dashed line L+
(FIG. 6) and use the remaining portion as the claw 15.

In this invention, as described above, the claw 15 is extended to form the locking piece 16 for hanging, so that the mark after cutting the locking piece 16 becomes the upper end of the claw 15, and the filter 11 fires the TV/TV receiver, etc. When the locking piece 16 is attached to a holder, the cut mark of the locking piece 16 will not be exposed and the appearance will not be impaired. Furthermore, since a part of the corner 14 is rounded and the inner peripheral surface 13aV is sloped, the coating liquid drains easily, and the thickness of the coating 18 becomes uniform over the entire surface of the filter 11, and cracks do not occur. Therefore, a good filter 11 can be obtained.

FIG. 7 is a perspective view of a filter showing another embodiment of the present invention before being coated with a film, and FIG. 8 is an explanatory diagram when the film is coated.

In these figures, reference numeral 16A indicates a locking piece for hanging that is provided to protrude outside the crack portion 13, and extends from a portion that will later be cut to become the claw 15 to the front of the transparent portion 12. . Note that other symbols indicate the same parts as in FIGS. 4 to 6.

Next, a process of manufacturing the filter 11 for use from the state shown in FIG. 7 will be described.

As in the previous embodiment, a hook Hy is inserted into the hole 17 of the locking piece 16A.
! 1 to coat the filter 11 with the film 18, and then the locking piece 16A'Y is cut along the dashed line L1 (FIG. 8), and the remaining portion is used as the claw 15.

In the case of this embodiment, when the filter 11 is hung with 7 hooks H, the locking point between the hook H and the locking piece 16A and the filter 11
0 center of gravity G'& perpendicular line L2 passing through, inner circumferential surface 13a of lower flange portion 13 & extended line.

Since the locking piece 16A extends to the front of the transparent part 12, the angle θ formed by the two ends is an acute angle.

Therefore, the coating liquid drains even better,
The thickness of the coating 18 is uniform over the entire surface.

In addition, in the above embodiment, the inner circumferential surface 13a is sloped over the entire circumference, and a part of the corner 14 is rounded, or the fourth corner is rounded.
In the case of the illustrated embodiment, at least only the inner circumferential surface 13a located at the bottom when the filter 11 is suspended may be made an inclined surface, and only a portion of the corner 14 may be rounded. The inclination of the inclined surface 13a may be determined by considering the strength of the flange portion 130. Furthermore, in the case of the embodiment shown in FIG. 7 in which the locking piece 16A is extended to the front surface of the transparent part 12, the inner circumferential surface 13a is not made into an inclined surface, and even if the corner part 14 is not rounded, the same result can be obtained. Effects can be obtained.

〔Effect of the invention〕

As explained above, in the filter manufacturing method of the present invention, the claw provided on one side of the flange portion is extended to form the locking piece, so there is no need to provide the claw and the locking piece separately, and the locking The mark left by cutting the piece becomes the upper part of the claw, and when it is attached to a TV receiver or the like that is a filter, the mark left by cutting the locking piece will not be exposed and the appearance will not be spoiled. In addition, by extending the locking piece to the front of the transparent section, it is possible to prevent the coating liquid from collecting in some corners, and the thickness of the coating is uniform over the entire surface, making it difficult for cranks to occur and ensuring a good filter. There are advantages such as:

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an example of a conventional filter before being coated with a film, Fig. 2 is a sectional view taken along line A-A in Fig. 1, Fig. 3 is an explanatory diagram when coating a film, Fig. 4 is a perspective view of a filter showing an embodiment of the present invention before being coated with a film, Fig. 5 is a sectional view taken along line B-B in Fig. 4, and Fig. 6 is an explanatory diagram when coating a film. , FIG. 7 is a perspective view of a filter showing another embodiment of the present invention before being coated with a film, and FIG. 8 is an explanatory view when coating without a film. In the figure, 11 is a filter, 12 is a transparent part, 13 is a flange part, 131L is an inner peripheral surface, 13b is an outer peripheral surface, 14 is a corner part, 15 is a claw, 16.16A is a locking piece, 17 is a hole, 1
B is a film and H is a hook.

Claims (2)

[Claims] (1) A transparent part, a flange part that goes around the back surface of this transparent part, and I provided on each opposing side of this flange part.
M M number of attachments are made by extending the claw provided on one side of the flange part to form a locking piece, suspending the locking piece, and immersing it in the coating liquid.
7. A method for manufacturing a filter, characterized in that after coating the filter with membrane rupture, the locking pieces are cut to form the claws. (2) Is the locking piece the angle formed by the perpendicular line passing through the center of gravity when the locking piece is hung and the vinegar that extends the inner peripheral surface of the lower 7th part? Q・n dexterity () of the patent claim, which is characterized by extending to the front of the transparent part to form a gun horn.
) The method for manufacturing the filter described in item 2.