JPH0378948A - Projection tv device - Google Patents

Projection tv device

Info

Publication number
JPH0378948A
JPH0378948A JP1216234A JP21623489A JPH0378948A JP H0378948 A JPH0378948 A JP H0378948A JP 1216234 A JP1216234 A JP 1216234A JP 21623489 A JP21623489 A JP 21623489A JP H0378948 A JPH0378948 A JP H0378948A
Authority
JP
Japan
Prior art keywords
lens
coolant
crt
projection
screen
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP1216234A
Other languages
Japanese (ja)
Inventor
Mitsushige Kondo
近藤 光重
Shinsuke Shikama
信介 鹿間
Hidekazu Tode
都出 英一
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP1216234A priority Critical patent/JPH0378948A/en
Publication of JPH0378948A publication Critical patent/JPH0378948A/en
Pending legal-status Critical Current

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  • Video Image Reproduction Devices For Color Tv Systems (AREA)

Abstract

PURPOSE:To suppress drop of the contrast on an image on the screen by furnishing an antireflection film at the boundary surface between coolant and CRT and that between the boundary surface of coolant and a first lens. CONSTITUTION:An arrangement according to the present invention includes a first antireflection film 10, which is installed on a CRT and prevents light reflection due to difference in the factor of refraction from the coolant, and a second antireflection film 11 which is installed on the surface of the first lens 5A contacting the coolant for a projection lens and prevents light reflection due to difference in the factor of refraction between the, first lens 5A of projection lens and the coolant. This reduces light reflection due to difference in the factor of refraction at the boundary surface of CRT and coolant and at the boundary surface of coolant and the first lens 5A. Thus contrast drop of the image on screen is suppressed, which allows projection of a good image onto a screen.

Description

【発明の詳細な説明】 [産業上の利用分野] この発明は、陰極線管上の画像をスクリーン上に投写す
るように構成されたプロジェクションテレビ装置に関す
るもので、詳しくは、投影光学系に関するものである。
[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a projection television device configured to project an image on a cathode ray tube onto a screen, and more specifically relates to a projection optical system. be.

[従来の技術] 第2図は一般的なプロジェクションテレビ装置の構成を
示す概略側面図であり、同図において、(1)は陰極線
管(以下、CRTと称す)で、このCRT (1)は第
3図で示すように、赤、青、緑の3本の互いに独立した
C RT (IR) 、 (IB) 、 (IG)によ
り構成されており、それらのガラス材の屈折率はnlで
ある。
[Prior Art] Fig. 2 is a schematic side view showing the configuration of a general projection television device. In the figure, (1) is a cathode ray tube (hereinafter referred to as CRT); As shown in Figure 3, it is composed of three mutually independent CRTs of red, blue, and green (IR), (IB), and (IG), and the refractive index of their glass materials is nl. .

(4)はスクリーン、(7)は反射ミラーで、上記各C
RT (IR) 、 (IB) 、 (IG)から出射
された光束(r)。
(4) is a screen, (7) is a reflective mirror, and each of the above C
Light flux (r) emitted from RT (IR), (IB), (IG).

(b) 、 (g)の方向を上記スクリーン(4)の方
向に反射させる。(8)は上記CRT (1)を駆動す
る電子回路である。
The directions of (b) and (g) are reflected in the direction of the screen (4). (8) is an electronic circuit that drives the CRT (1).

第4図は従来のプロジェクションテレビ装置における要
部の断面図、つまり、投影光学系の具体構造を示し、同
図において、(2)はCRT (1)を冷却する冷却液
で、その屈折率は口2である。
Figure 4 is a cross-sectional view of the main parts of a conventional projection television device, that is, the specific structure of the projection optical system. Mouth 2.

(3)は投写レンズで、第1〜第4レンズ(5A)〜(
50)より構成されており、上記冷却液(2)に接した
第1レンズ(5A)の屈折率はn3である。(6)は冷
却液ホルダで、上記CRT (1)と投写レンズ(3)
とをつなぐとともに、上記冷却液(2)を保持する。
(3) is a projection lens, the first to fourth lenses (5A) to (
50), and the refractive index of the first lens (5A) in contact with the cooling liquid (2) is n3. (6) is a coolant holder that connects the CRT (1) and the projection lens (3).
and also holds the cooling liquid (2).

なお、上記各屈折率はnl、n2.n3は、nl+n2
≠n3の関係に設定されている。
In addition, each of the above refractive indexes is nl, n2. n3 is nl+n2
The relationship is set as ≠n3.

つぎに、上記構成の動作について説明する。Next, the operation of the above configuration will be explained.

電子回路(8)により駆動される各CRT (IR)。Each CRT (IR) driven by an electronic circuit (8).

(IB) 、 (IG)の蛍光面上にそれぞれ赤、青、
緑の独立した画像が映し出される。これら各画像は投写
レンズ(3)より反射ミラー(7)に向けて出射され、
この反射ミラー(7)で反射された画像がスクリーン(
4)上に投写される。このとき、赤、青、緑の像がスク
リーン(4)上において重ね合わされてカラー画像とな
る。
Red, blue, and
A separate image of green is projected. Each of these images is emitted from the projection lens (3) toward the reflection mirror (7),
The image reflected by this reflective mirror (7) is displayed on the screen (
4) Projected on top. At this time, red, blue, and green images are superimposed on the screen (4) to form a color image.

このような投写状態において、上記各CRT(IR) 
、 (IB) 、 (IG)は冷却液(2)によって保
冷されており、その発熱が抑えられている。
In such a projection state, each CRT (IR)
, (IB), and (IG) are kept cool by the cooling liquid (2), and their heat generation is suppressed.

[発明が解決しようとする課題] 従来のプロジェクションテレビ装置は以上のように構成
されているので、CRTの構成ガラス材、冷却液および
投写レンズの第1レンズそれぞれの屈折率が異なるため
、冷却液(2) とCRT(1)の境界面および冷却液
(2)と第1レンズ(5A)の境界面での光の反射を避
けることができず、光の迷走によりスクリーン上での画
像のコントラストの低下を発生するという問題があった
[Problem to be Solved by the Invention] Since the conventional projection television apparatus is configured as described above, the refractive index of the constituent glass material of the CRT, the cooling liquid, and the first lens of the projection lens are different, so the cooling liquid (2) Reflection of light at the interface between CRT (1) and coolant (2) and the first lens (5A) cannot be avoided, and the stray light causes the contrast of the image on the screen to decrease. There was a problem that a decrease in

この発明は上記のような問題点を解消するためになされ
たもので、冷却液とCRTの境界面および冷却液と第1
レンズの境界面での光の反射を軽減させてコントラスト
の向上を達成することができるプロジェクションテレビ
装置を提供することを目的とする。
This invention was made to solve the above-mentioned problems.
An object of the present invention is to provide a projection television device that can improve contrast by reducing light reflection at the boundary surface of lenses.

[課題を解決するための手段] この発明に係るプロジェクションテレビ装置は、冷却液
とCRTの境界面および冷却液と第1レンズの境界面に
それぞれ反射防止膜を設けたことを特徴とする。
[Means for Solving the Problems] A projection television apparatus according to the present invention is characterized in that an antireflection film is provided on the interface between the coolant and the CRT and the interface between the coolant and the first lens.

[作用] この発明によれば、互いに屈折率が異なるCRTと冷却
液との境界面での光の反射および冷却液と第1レンズと
の境界面での光の反射をともに軽減することが可能とな
り、スクリーン上の画像のコントラストの低下を抑制す
ることができる。
[Function] According to the present invention, it is possible to reduce both the reflection of light at the interface between the CRT and the coolant, which have different refractive indexes, and the reflection of light at the interface between the coolant and the first lens. Therefore, it is possible to suppress a decrease in the contrast of the image on the screen.

[発明の実施例] 以下、この発明の一実施例を図面にもとづいて説明する
[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described based on the drawings.

第1図はこの発明の一実施例によるプロジェクションテ
レビ装置の要部の断面構造を示し、同図において、(1
0)はCRT (1)の表面に形成された第1の反射防
止膜である。この第1の反射防止膜(10)の屈折率n
4および厚みd4は、CRT (1)より出射される光
の中心波長をλとするとき、n4−517n4   ・
・・・・・・・・・・・■d4=λ/4φ・争・―・・
・・・・・■に設定されている。
FIG. 1 shows a cross-sectional structure of a main part of a projection television apparatus according to an embodiment of the present invention, and in the same figure, (1
0) is the first antireflection film formed on the surface of the CRT (1). The refractive index n of this first antireflection film (10)
4 and the thickness d4 are n4-517n4, where λ is the center wavelength of the light emitted from the CRT (1).
・・・・・・・・・・・・■d4=λ/4φ・Conflict・――・
...It is set to ■.

(11)は第1レンズ(5A)上の表面に形成された第
2の反射防止膜で、その屈折率n5および厚みd5は、 n5−ム璽「7「y  ・・・・・・・・・・・・■d
5−λ/4       ・・・・・・・・・・・・■
に設定されている。
(11) is a second anti-reflection film formed on the surface of the first lens (5A), and its refractive index n5 and thickness d5 are as follows. ...■d
5-λ/4 ・・・・・・・・・・・・■
is set to .

以上のような第1および第2の反射防止膜(10)およ
び(11)は、赤、青、緑に発光される光の中心波長λ
に応じて、それぞれ最適の厚みd4、d5に形成されて
いる。
The first and second anti-reflection films (10) and (11) as described above have a central wavelength λ of light emitted in red, blue, and green.
They are formed to have optimal thicknesses d4 and d5, respectively, depending on the thickness.

なお、その他の構成は第4図で示す従来例と同一のため
、該当部分に同一の符号を付して、それらの詳しい説明
を省略する。また、プロジェクションテレビ装置の全体
構成は第2図で示すものと同一であるため、その記載も
省略する。
In addition, since the other configurations are the same as the conventional example shown in FIG. 4, the same reference numerals are given to the corresponding parts and detailed explanation thereof will be omitted. Furthermore, since the overall configuration of the projection television apparatus is the same as that shown in FIG. 2, its description will also be omitted.

つぎに、上記構成のプロジェクションテレビ装置の動作
について説明する。
Next, the operation of the projection television apparatus having the above configuration will be explained.

CRT (1) と冷却液(2)の境界面および冷却液
(2)と第1レンズ(5A)の境界面に形成された第1
の反射防止膜(10)および第2の反射膜(11)は、
波長λの光に対して完全な反射防止をおこない、また発
光中心の波長λ以外の光に対しても、赤、青、緑それぞ
れ独立して最適の厚みd4. d5に設定されているの
で、各境界面での反射パワーを軽減することができる。
A first lens formed at the interface between the CRT (1) and the coolant (2) and between the coolant (2) and the first lens (5A).
The anti-reflective film (10) and the second reflective film (11) are
It provides complete anti-reflection for light with a wavelength λ, and also provides optimal thickness d4 for red, blue, and green independently for light other than the wavelength λ at the emission center. Since it is set to d5, the reflected power at each boundary surface can be reduced.

[発明の効果] 以上のように、この発明によれば、CRTと冷却液との
境界面および冷却液と第!レンズとの境界面における屈
折率の差による光の反射を軽減することができるので、
スクリーン上の画像のコントラストの低下を抑制し、良
好な画像をスクリーン上に映出させることができる。
[Effects of the Invention] As described above, according to the present invention, the interface between the CRT and the coolant and the interface between the CRT and the coolant! It is possible to reduce the reflection of light due to the difference in refractive index at the interface with the lens.
It is possible to suppress a decrease in the contrast of an image on the screen and display a good image on the screen.

【図面の簡単な説明】[Brief explanation of drawings]

第1図はこの発明の一実施例によるプロジェクションテ
レビ装置の要部の断面構造図、第2図はプロジェクショ
ンテレビ装置の一般的な構成を示す概略側面図、第3図
はCRTの構成図、第4図は従来のプロジェクションテ
レビ装置の要部の断面構造図である。 (1)   (IR)、(IB)、(IG)  ・・・
CRT、(2)・・・冷却液、(3)・・・投写レンズ
、(4)・・・スクリーン、(5A)・・・第1レンズ
、(10)・・・第1の反射防止膜、(11)・・・第
2の反射防止膜。 なお、図中の同一符号は同一または相当部分を示す。
FIG. 1 is a cross-sectional structural diagram of the main parts of a projection television device according to an embodiment of the present invention, FIG. 2 is a schematic side view showing the general configuration of the projection television device, and FIG. 3 is a configuration diagram of a CRT. FIG. 4 is a cross-sectional structural diagram of the main parts of a conventional projection television apparatus. (1) (IR), (IB), (IG)...
CRT, (2)...Cooling liquid, (3)...Projection lens, (4)...Screen, (5A)...First lens, (10)...First anti-reflection film , (11)...Second antireflection film. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

【特許請求の範囲】[Claims] (1)陰極線管と、この陰極線管上の画像をスクリーン
上に投写する投写レンズと、上記陰極線管と投写レンズ
の間に注入された冷却液と、上記陰極線管上に設けられ
上記冷却液との屈折率差による光の反射を防止する第1
の反射防止膜と、上記投写レンズの上記冷却液に接する
第1レンズ面上に設けられ投写レンズの第1レンズと冷
却液との屈折率差による光の反射を防止する第2の反射
防止膜とを備えたことを特徴とするプロジェクションテ
レビ装置。
(1) A cathode ray tube, a projection lens that projects the image on the cathode ray tube onto a screen, a cooling liquid injected between the cathode ray tube and the projection lens, and a cooling liquid provided on the cathode ray tube. The first method is to prevent light reflection due to the difference in refractive index of
and a second anti-reflection film provided on a first lens surface of the projection lens in contact with the cooling liquid to prevent reflection of light due to a difference in refractive index between the first lens of the projection lens and the cooling liquid. A projection television device comprising:
JP1216234A 1989-08-23 1989-08-23 Projection tv device Pending JPH0378948A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1216234A JPH0378948A (en) 1989-08-23 1989-08-23 Projection tv device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1216234A JPH0378948A (en) 1989-08-23 1989-08-23 Projection tv device

Publications (1)

Publication Number Publication Date
JPH0378948A true JPH0378948A (en) 1991-04-04

Family

ID=16685380

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1216234A Pending JPH0378948A (en) 1989-08-23 1989-08-23 Projection tv device

Country Status (1)

Country Link
JP (1) JPH0378948A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0573843A2 (en) * 1992-06-08 1993-12-15 Matsushita Electric Industrial Co., Ltd. Lens holder and method for making a thin film
JPH0712936A (en) * 1993-06-28 1995-01-17 Nec Corp Range finder using light wave
US5702016A (en) * 1994-09-16 1997-12-30 Goldstar Co., Ltd. Braun tube for a projection television receiver
KR100828457B1 (en) * 2007-05-09 2008-05-13 주식회사 테크유니온 Bracket for installing a shading plate on a guardrail

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0573843A2 (en) * 1992-06-08 1993-12-15 Matsushita Electric Industrial Co., Ltd. Lens holder and method for making a thin film
EP0573843A3 (en) * 1992-06-08 1994-12-14 Matsushita Electric Ind Co Ltd Lens holder and method for making a thin film.
US5612085A (en) * 1992-06-08 1997-03-18 Matsushita Electric Industrial Co., Ltd. Lens holder and method for making a thin film
JPH0712936A (en) * 1993-06-28 1995-01-17 Nec Corp Range finder using light wave
US5702016A (en) * 1994-09-16 1997-12-30 Goldstar Co., Ltd. Braun tube for a projection television receiver
KR100828457B1 (en) * 2007-05-09 2008-05-13 주식회사 테크유니온 Bracket for installing a shading plate on a guardrail

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