JPH01186737A

JPH01186737A - Cathode-ray tube

Info

Publication number: JPH01186737A
Application number: JP713888A
Authority: JP
Inventors: Toru Maruyama; 徹丸山
Original assignee: Individual
Current assignee: Individual
Priority date: 1988-01-16
Filing date: 1988-01-16
Publication date: 1989-07-26

Abstract

PURPOSE:To reduce outside light reflection by blackening the material of a front glass material itself and coating the surface thereof with an antireflection film. CONSTITUTION:The material of front glass 1 is colored to be black for light absorption and the surface thereof is coated with an antireflection film 2. As a result, reflection on the surface is prevented by the antireflection film 2 and reflection on a fluorescent surface is decayed in the glass 1, thereby enabling the reduction of outside light reflection.

Description

【発明の詳細な説明】〔産業上の利用分野〕この発明は、テレビ等のブラウン管に関するものである
。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cathode ray tube for televisions and the like.

[Conventional technology]

従来のブラウン管は、前面ガラスの表面を黒くする事に
より、外光反射を少くしていた。Conventional cathode ray tubes have a blackened front glass surface to reduce the reflection of external light.

[Problem to be solved]

しかし、蛍光面の反射は、多少、少なく出来るが、表面
での反射は、必ずしも少なくならない。However, although the reflection from the phosphor screen can be reduced to some extent, the reflection from the surface cannot necessarily be reduced.

[Means for solving problems]

この発明は、上記の問題点、つまり、外光反射を少なく
するためのものであり、（イ）前面ガラスの材質自体を黒くして、前面ガラスの
表面に反射防止膜をコーティングする、あるいは、（ロ）前面ガラスの表面に反射防止膜をコーティングし
、その上に前面ガラスと異る屈折率を持つ吸収膜を設定
し、その上に反射防止膜をコーティングする。This invention solves the above problem, that is, to reduce the reflection of external light. (a) The material of the front glass itself is made black and the surface of the front glass is coated with an antireflection film, (b) An anti-reflection film is coated on the surface of the front glass, an absorption film having a refractive index different from that of the front glass is set on top of the anti-reflection film, and an anti-reflection film is coated on top of that.

（ハ）前面ガラスの表面に、前面ガラスと同じ様な屈折
率を持つ吸収膜を設定し、その上に反射防止膜をコーテ
ィングする。(c) An absorbing film having a refractive index similar to that of the front glass is set on the surface of the front glass, and an antireflection film is coated on top of it.

又、あるいは、（ニ）前面ガラスの裏面に、前面ガラスと異なる屈折率
を持つところの反射減衰膜を、コーティングし、そのう
しろに蛍光板を設定する。Alternatively, (d) A reflection attenuation film having a refractive index different from that of the front glass is coated on the back surface of the front glass, and a fluorescent screen is set behind it.

又、あるいは、（ホ）前面ガラスの裏面を凸凹にして、その上に蛍光体
をコーティングした時に、蛍光面で、外光を乱反射させ
る。Or, (e) When the back surface of the front glass is made uneven and a phosphor is coated on it, the phosphor screen diffusely reflects external light.

〔実施例〕−１第１図の様に、前面ガラス（１）、の材質は、光を吸収
する様、黒く着色してあり、その表面に反射防止膜（２
）をコーティングしてあるので、表面での反射は反射防
止膜で防止され、蛍光面での反射は、ガラスの中で減衰
される。[Example]-1 As shown in Figure 1, the material of the front glass (1) is colored black to absorb light, and an anti-reflection film (2) is coated on its surface.
), reflections from the surface are prevented by an anti-reflection film, and reflections from the fluorescent screen are attenuated within the glass.

〔実施例〕−２第２図において、前面ガラス（３）表面に反射防止膜（
２）がコーティングしてあり、その上に前面ガラスと異
なる屈折率を持ち、光を吸収する、吸収又（４）、を、
設定し、その上に反射防止膜（２）がコーティングされ
ているので、吸収膜表面と、ガラス表面でのそれぞれの
反射は、それぞれの上にある、反射防止膜で防止され、
蛍光面での反射は、吸収膜（４）により少なくなる。[Example]-2 In Figure 2, an anti-reflection film (
2) is coated, and on top of that is an absorbent glass that has a refractive index different from that of the front glass and absorbs light, or (4),
Since the anti-reflection film (2) is coated on top of the anti-reflection film, reflections on the absorption film surface and the glass surface are prevented by the anti-reflection film on each.
Reflection on the phosphor screen is reduced by the absorption film (4).

〔実施例〕−３第３図において、前面ガラス（３）の表面に、前面ガラ
ス（３）、と同じ屈折率を持つ光の吸収膜（４）、を設
定し、その上に反射防止膜（２）がコーティングされて
いるので、吸収膜（４）の表面での反射は、反射防止膜
（２）で防止され、前面ガラス（３）の表面での反射は
起らず、蛍光面での反射は、吸収膜的により少なくなる
。[Example]-3 In Figure 3, a light absorbing film (4) having the same refractive index as the front glass (3) is set on the surface of the front glass (3), and an anti-reflection film is placed on top of it. (2) is coated, so reflection on the surface of the absorption film (4) is prevented by the anti-reflection film (2), reflection on the surface of the front glass (3) does not occur, and reflection on the surface of the front glass (3) does not occur. The reflection of the absorption film becomes smaller.

〔実施例〕−４第４図において、前面ガラス（３）の裏面に、前面ガラ
スと異なる屈折率を持つ、反射減衰膜（５）をコーティ
ングし、その上に、蛍光板（６）を設定してある。[Example]-4 In Fig. 4, a reflection attenuation film (5) having a refractive index different from that of the front glass is coated on the back surface of the front glass (3), and a fluorescent screen (6) is set on top of it. There is.

なお、ここで反射減衰膜の基本原理は、第５図において
、減衰膜（５）の厚さを、膜内の光の波長の１／４、に
なる様にすると、入射光（８）は、膜の表面での反射光
（９）と、物体（７）の反射光（１０）と、物体（７）
の吸収光（１１）に分れる。反射光（９）と、反射光（
１０）は、互いに打消し合うので、もし反射光（９）＜
反射光（１０）ならば、全体的に反射される光は、反射
光（１０）一反射光（９）、となるものである。なお、
もし反射光（９）二反射光（１０）ならば、無反射膜と
なる。The basic principle of the reflection attenuation film is as shown in Fig. 5, when the thickness of the attenuation film (5) is set to 1/4 of the wavelength of the light inside the film, the incident light (8) is , the reflected light (9) on the surface of the film, the reflected light (10) of the object (7), and the object (7)
It is divided into absorbed light (11). Reflected light (9) and reflected light (
10) cancel each other out, so if the reflected light (9) <
If it is reflected light (10), the total amount of light reflected is one reflected light (10) and one reflected light (9). In addition,
If there are two reflected lights (9) and (10), the film becomes a non-reflective film.

本、発明の場合、蛍光板（６）の反射が大きいと仮定す
るので、蛍光板（６）の反射は、反射減衰膜（５）によ
り、少なくなるのである。又、この場合、反射減衰膜（
５）の屈折率は、前面ガラス（３）と大きく異なる方が
良く、それには、ダイヤモンドが良いであろう。In the case of the present invention, it is assumed that the reflection of the fluorescent screen (6) is large, so the reflection of the fluorescent screen (6) is reduced by the reflection attenuating film (5). In addition, in this case, the reflection attenuation film (
The refractive index of 5) should be significantly different from that of the front glass (3), and diamond would be a good choice for that.

〔実施例〕−５前面ガラスの裏面を凸凹にして、その上に蛍光体をコー
ティングした時に、外光は、蛍光面で、乱反射する様に
設定する事で、蛍光面の、外光による輝きを、少なく出
来る。[Example]-5 When the back surface of the front glass is made uneven and a phosphor is coated on it, the brightness of the phosphor screen is reduced by setting it so that the outside light is diffusely reflected on the phosphor screen. You can do it less.

〔effect〕

以上の様に、外光反射を少なく出来るために、より、見
やすいブラウン管となるものである。As described above, since reflection of external light can be reduced, the cathode ray tube is easier to view.

[Brief explanation of the drawing]

第１図：実施例１を示す、一部断面斜視図第２図：実施
例２を示す、断面図第３図：実施例３を示す、断面図第４図：実施例４を示す、断面図第５図：実施例４を示す、原理図１：黒く着色されたガラス　２：反射防止膜　３：前面
ガラス　４：吸収膜　５：反射減衰膜　６：蛍光体　７
：物体　８：入射光　９：反射光　１０：反射光　１１
：吸収光Figure 1: Partial cross-sectional perspective view showing Example 1 Figure 2: Cross-sectional view showing Example 2 Figure 3: Cross-sectional view showing Example 3 Figure 4: Cross-section showing Example 4 Figure 5: Principle diagram showing Example 4 1: Black colored glass 2: Antireflection film 3: Front glass 4: Absorption film 5: Reflection attenuation film 6: Phosphor 7
: Object 8: Incident light 9: Reflected light 10: Reflected light 11
:Absorbed light

Claims

[Claims] 1. A cathode ray tube in which the material of the front glass itself is made black and the surface of the front glass is coated with an antireflection film. 2. Coating the front glass surface with an anti-reflection film,
A cathode ray tube has an absorbing film with a different refractive index than the front glass and is coated with an anti-reflection film. 3. A cathode ray tube with an absorbing film on the front glass surface that has a refractive index similar to that of the front glass, and an anti-reflection film coated on top. 4. A cathode ray tube that has a reflective attenuation film coated on the back of the front glass, which has a different refractive index than the front glass, and a fluorescent screen behind it. 5. A cathode ray tube whose backside of the front glass has a rough surface and is coated with phosphor.