KR950010456B1

KR950010456B1 - Color tv filter and its making method

Info

Publication number: KR950010456B1
Application number: KR1019880007008A
Authority: KR
Inventors: 홍현수; 김준모
Original assignee: 주식회사 금성사; 최근선
Priority date: 1988-06-11
Filing date: 1988-06-11
Publication date: 1995-09-18
Also published as: KR900001249A

Abstract

The filter provides uniform contrast over a whole frame and no luminance difference between center and edges of a frame. The manufacturing method includes the steps of; (A)forming a black coated layer(2) of which density becomes lower as the distance from center of the filter base becomes far off; and (B) forming a protective layer(3) so that the beam is transmitted uniformly at the center and the edge of the black coated layer.

Description

Color water pipe filter and manufacturing method

제 1 도는 종래의 필터를 수상관에 취부한 측면도.1 is a side view of a conventional filter attached to a water pipe.

제 2 도는 (a)(b)는 본 발명의 필터를 도시한 것으로2 (a) and (b) show the filter of the present invention.

(a)는 측단면도이고,(a) is a side cross-sectional view,

(b)는 정면도이다.(b) is a front view.

제 3 도는 본 발명의 제조방법을 도시한 설명도.3 is an explanatory diagram showing a manufacturing method of the present invention.

제 4 도는 본 발명의 증착패턴도.4 is a deposition pattern of the present invention.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

1 : 필터베이스 2 : 흑색코팅막1 filter base 2 black coating film

3 : 보호막 4 : 증착패턴3: protective film 4: deposition pattern

본 발명은 칼라수상관의 전면에 취부되어 유해 전자파를 차단하는 필터에 관한 것으로 특히 필터에 의해 콘트라스트비 및 휘도를 화면의 전영역에서 최적으로 하게한 칼라수상관용 필터 및 그 제조방법에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter which is mounted on the front of a color receiving tube to block harmful electromagnetic waves. More particularly, the present invention relates to a filter for a color water receiving tube, in which a contrast ratio and luminance are optimally optimized in all areas of a screen by a filter, and a manufacturing method thereof.

일반적으로 제 1 도와 같이 수상관(CRT)에 취부되어 필터(10)는 수상관(CRT)의 형광면 크기와 상응되는데 재질을 아크릴계 수지물을 압축성형한 것과, 평판그라스 재재질을 사용한 것도 있다.In general, the filter 10 is mounted on the water pipe (CRT) as shown in FIG. 1, and the filter 10 corresponds to the fluorescent surface of the water pipe (CRT). The material may be a compression molded acrylic resin material or a plate glass material.

이러한 칼라수상관용 필터는 주지의 사실과 같이 첫째 수상관의 동작시 형광면에서 방출되는 적외선 및 자외선등의 유해전자파를 흡수하여 사용자의 시력을 보호하고, 둘째로 외부광선의 반사광을 감소시켜 영상의 콘트라스트비를 향상되게 하여 선명한 화면을 제공하며, 셋째로 외부의 충격에 의한 형광면의 손상을 방지함을 목적으로 하는데, 일반적으로 수상관의 동작시 중앙부의 광방출량이 주변부의 그것보다 훨씬 많은데 이는 도시하지 않은 전자총으로 부터 방출된 전자빙의 형광면에서의 구경이 중앙보다 주변부가 크며, 칼라음극선관의 경우 3원색 전자빔의 간격이 주변에서는 일정치 않으므로 이에 따라 색순도 여유도가 줄어 든다. 통상 이를 개선키 위해 도시하지 않은 샤도우마스크의 홀을 중앙보다 주변을 작게 하여주고 또한 화소크기를 역시 주변을 줄여 준다.As the well-known fact, the color water filter for the first time absorbs harmful electromagnetic waves such as infrared rays and ultraviolet rays emitted from the fluorescent surface during the operation of the receiving tube, and protects the eyesight of the user. The purpose of the present invention is to provide a clear screen by improving the rain, and to prevent damage to the fluorescent surface caused by external impacts. In general, when the water pipe is operated, the amount of light emitted from the center is much higher than that of the periphery. In the fluorescent surface of the electron ice emitted from the electron gun, the periphery is larger than the center. In the case of the color cathode ray tube, the spacing of the three primary color electron beams is not constant in the periphery, thereby reducing color purity margin. In order to improve this, the shadow mask hole, which is not shown, is made smaller than the center and the pixel size is also reduced.

이런 관계로 인해 상기와 같이 주변에서의 광방출량 즉 휘도(輝度)가 중앙의 그것보다 낮아지게 된다.Due to this relationship, the amount of light emitted from the surroundings, that is, the luminance, is lower than that of the center as described above.

또한 수상관의 대형화에 따라 화면을 구성하는 형광면의 중앙부와 주변부의 휘도차이가 심하게 발생하게 되어 이에 따른 별도의 휘도 보정장치가 필요케 되고 종래의 필터로서는 상기 문제를 해소시키기가 불가능했다.In addition, as the size of the receiving tube increases, the difference in luminance between the central portion and the peripheral portion of the fluorescent screen constituting the screen is severely generated, and thus a separate luminance correction device is required. Therefore, it is impossible to solve the above problem with a conventional filter.

본 발명은 상기의 문제를 해소코져 창출된 것으로 필터의 일면에 영상의 광을 흡수하는 코팅막을 형성하여서 화면의 선명도를 향상시키고, 휘도의 균일을 도모케 한 것으로서 제 2 도-제 4 도에 의거 본 발명을 상세히 설명하면 다음과 같다.The present invention is to solve the above problems, by forming a coating film for absorbing the light of the image on one surface of the filter to improve the clarity of the screen, and to promote the uniformity of the luminance according to FIGS. The present invention is described in detail as follows.

제 2 도의 (a)에 도시한 바와 같이 필터베이스(1)의 한측면에 광을 설정된 비율로 흡수시켜주는 흑색코팅막(2)을 형성하고, 이 흑색코팅막(2)의 외부는 보호막(3)을 피착하여서 구성한다. 통상 수상관의 화질의 선명도를 콘트라스트비로서 나타내는데 불필요한 외부광의 형광면에서의 반사광휘도를 B₂, 수상관 자체의 방출광을 B₁이라 할때 콘트라스트비

의 관계로 나타낸다.As shown in FIG. 2A, a black coating film 2 is formed on one side of the filter base 1 to absorb light at a set ratio, and the outside of the black coating film 2 is a protective film 3. It is constructed by depositing. Normally, the picture quality of the picture tube is expressed as the contrast ratio. When the reflected light intensity on the fluorescent surface of external light that is unnecessary is B ₂ , and the emitted light of the picture tube itself is B ₁ , the contrast ratio is shown.

It is represented by the relation of.

여기서 외부의 반사광휘도(B₂)는 형광면상에서 중앙부와 주변이 동일한 반면 수상관의 방출광(B₁)은 수상관의 형광면상의 대각선이 교차하는 중앙부가 그 주변부보다 큰 관계로 콘트라스트비도 주변부위는 훨씬 나빠진다. 이러한 관계로 상기 흑색코팅막(2)은 수상관의 형광면의 휘도에 대응되게 중앙부위는 짙게 외측으로는 점점 흐르게 니켈(Ni) 분말을 진공 증착시키는데, 상기 보호막(3)은 불화마그네슘(MgF₂)등이 사용될 수 있으며, 투명실리콘수지등을 도포하여도 동일한 효과를 갖는다.Here, the external reflected light intensity (B ₂ ) is the same as the center portion on the fluorescent surface, while the emitted light (B ₁ ) of the water tube is larger than its periphery because the center of the diagonal line on the fluorescent surface of the water tube is larger than its periphery. Much worse In such a relationship, the black coating film 2 vacuum-deposits nickel (Ni) powder to gradually flow outward from the central part to correspond to the luminance of the fluorescent surface of the water tube. The protective film 3 is magnesium fluoride (MgF ₂ ). Etc. may be used, and the same effect is obtained by applying a transparent silicone resin or the like.

이와 같이 구성된 본 발명의 제조방법은 제 3 도 및 제 4 도에 도시한 바와 같이 진공증착기내에 고정된 필터베이스(1)를 놓고 흑색코팅소스(2a)와 필터베이스(1)간에 수상관의 광방출량(B₁)이 중앙부와 주변부가 일치하도록 각 반경에 대한 개공각 θn(n=1, 2, 3…)이 형성된 증착패턴(4)이 형성된 증착패턴(4)을 삽입하여 이를 연속적으로 회전운동시킴과 동시에 흑색코팅소스(2a)에 전원을 인가하여 가열하여서 흑색코팅제를 필터베이스(1)의 한면에 증착시킨다.According to the manufacturing method of the present invention configured as described above, as shown in FIGS. 3 and 4, the filter base 1 fixed in the vacuum evaporator is placed, and the light of the water pipe between the black coating source 2a and the filter base 1 is provided. Rotation pattern B is inserted into the deposition pattern 4 with the opening pattern θn (n = 1, 2, 3 ...) for each radius so that the emission amount B ₁ coincides with the center portion and the periphery portion thereof. At the same time as the movement, power is applied to the black coating source 2a to be heated to deposit a black coating agent on one surface of the filter base 1.

또한 진공증착기로 형성할때는 제 3 도의 흑색코팅소스(2a)옆에 별도의 포트를 구성하여서 흑색코팅막(2)을 형성한 다음 동일한 방법으로 보호막(3)을 형성시켜 줄 수 있으며, 또다른 방법으로는 투명실리콘수지등으로 도포하여 보호막(3)을 형성시킬 수가 있다.In addition, when forming a vacuum vapor deposition by forming a separate port next to the black coating source (2a) of Figure 3 to form a black coating film (2) and then to form a protective film (3) in the same way, another method Can be applied with a transparent silicone resin or the like to form the protective film 3.

제 4 도에서 미설명부호인 4a는 개구부이다.In FIG. 4, reference numeral 4a denotes an opening.

상술한 바와 같이 본 발명은 형광면상의 중앙과 주변의 휘도차이가 없게 되고 수상관의 전화면에 일정한 콘트라스트비를 얻게하여 선명한 영상을 제공케된 매우 유용한 발명이다.As described above, the present invention is a very useful invention in which there is no difference in luminance between the center and the surroundings on the fluorescent screen and a constant contrast ratio is obtained on the full screen of the receiving tube to provide a clear image.

Claims

On the surface of the filter base 1, a black coating film 2 having a lower density is gradually formed toward the outside from the center of the filter base 1, and a protective film 3 is formed on the black coating film 2 to emit light from the water pipe. The black coating film (2) by the black coating membrane, characterized in that the same in the transmission through the center and the outer portion of the filter.

2. The color water pipe filter according to claim 1, wherein the black coating film (2) is made of nickel (Ni).

The filter for color water pipes according to claim 1, wherein the protective film (3) is formed of magnesium fluoride (MgF ₂ ).

The filter base 1 is fixed in the vacuum evaporator, and the coating density gradually increases toward the peripheral part based on the center of the filter base 1 so that the light emission amount B1 of the water pipe coincides with the central part of the filter base 1. The deposition pattern 4 having the opening angle Qn for each radius to be lowered is inserted between the filter base 1 and the black coating source 2a to perform continuous rotational movement and simultaneously the black coating source 2a. A method for producing a color water pipe filter, characterized in that to deposit a coating film by heating.