JPS5838439A - Projection type cathode-ray tube - Google Patents

Abstract

PURPOSE:To air at improvement in resolution as well as a decrease of variations in bulb characteristics by putting a steel band with adjustable tightening force around the peripheral surface of a bulb's end plate, while forcibly altering the apparent curvature of a mirror with the tightening force. CONSTITUTION:A steel band 17, which is adjustable in its tightening force, is put around the peripheral surface of an end plate 5 of a bulb 10 sealing up and end plate 5 provided with a face plate 1 and a concave-spherical mirror 6 inside the bulb, via a ringlike buffer material 18 of rubber and the like, transforming the end plate 5 curved inward by dint of the tightening force of the band 17, through which the apparent curvature of the mirror 6 is designed to be forcibly altered. In addition, setting metal fixtures 19 with an L-shaped section each are set in and fixed at the plural number of spots between the buffer material 18 and the band 17, and the bulb 10 is so designed that it can be attached to an external cabinet and so on, via the fixtures 19. With this, resolution can be improved.

Description

【発明の詳細な説明】 この発明は投写距離を調整可能とし解像度の向上を目的
とする投写型陰極ｍ管に閃する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a projection type cathode m-tube whose projection distance is adjustable and whose purpose is to improve resolution.

投写型テレビジョン装置等に用いられる反射式の投写型
陰極線管の一例を第７図に示すと、ｆｉ＋は内面中央部
にメタルバック＃（２ｊと螢光膜（８）を積層して形成
したターゲット（４）を有する同心メニスカス状の７エ
ースプレー）、＋５１：凹９２状の内面に金属蒸着でミ
ラー（６）を形成したエンドプレート、（７１ｉｔエン
ドプレート（５）の中央部から外方に延びるネック部、
（８）は両端面に７エースプレート（１）及びエンドプ
レート（６）を封着した円筒部材である。この円筒部材
（８）の両端面とフェースプレート（１）及びエンドプ
レート（５）の各内面は同一曲率中心を有する球状面（
研磨加工され、この三者をクリットガラス（θ）（９）
で一体に封着してパルプ（ｌＯ）が形成される。また（
１すはネック部（７）内に収納された電子銃、ｖ２１は
ネックｉ＜＋７１の外周面上に配置した集束偏向手段と
してのコイル、（１３１はフェースプレート（１）の前
方定位置に配置した球面収差補正体、（ｌＩ＆ｌは球面
収差補正体＋１１を支持する支持枠、０５）は球面収差
補正体−の更に前方定位ＵＫ配装したスクリーンである
。球面収差補正体θ樽はミラー（６）による球面収差を
補ノ 正する例えはシュミットレンズ（ｌ；ｓａ）で、これに
ミラー（６）の集点距離を調整する凸レンズ（１３ｂ）
を一体に糾合せている。Figure 7 shows an example of a reflective projection cathode ray tube used in projection television equipment, etc. The fi+ is formed by laminating a metal back # (2j) and a fluorescent film (8) at the center of the inner surface. Concentric meniscus-shaped 7 ace play with target (4)), +51: An end plate with a mirror (6) formed by metal vapor deposition on the inner surface of a concave 92 shape, (from the center of the 71it end plate (5) outwards Extending neck,
(8) is a cylindrical member with a 7 ace plate (1) and an end plate (6) sealed on both end faces. Both end surfaces of this cylindrical member (8) and each inner surface of the face plate (1) and end plate (5) are spherical surfaces (
Polished glass (θ) (9)
are sealed together to form pulp (lO). Also(
1 is an electron gun housed in the neck part (7), v21 is a coil as a focusing/deflecting means arranged on the outer peripheral surface of the neck i<+71, (131 is arranged at a fixed position in front of the face plate (1) spherical aberration corrector, (lI&l is a support frame that supports the spherical aberration corrector +11, 05) is a screen that is positioned further forward of the spherical aberration corrector -.The spherical aberration corrector θ barrel is a mirror (6 ) is an example of a Schmidt lens (l; sa) that corrects the spherical aberration caused by the lens, and a convex lens (13b) that adjusts the focal point distance of the mirror (6).
are brought together as one.

上記隘ｍ、ｍ管は次の動作を行う。即ち、電子銃（１り
から放出された電子ビームＯ呻は集束偏向コイル政によ
ってターゲット（４）上を走査して螢光膜（３）上に訣
像を描く。このｌＩ！Ｉ！像光Ｖｉミラー（６）によっ
て反射拡大されフェースプレート（１）を透過してから
、そのボ１方の球面収差補正体端を通ってスクリーン０
６）上に結像し、拡大像を峡す。The above-mentioned tubes m and m perform the following operations. That is, the electron beam emitted from the electron gun (1) is scanned over the target (4) by means of a focusing and deflecting coil, and forms an optical image on the phosphor film (3). After being reflected and magnified by the Vi mirror (6) and transmitted through the face plate (1), the beam passes through the edge of the spherical aberration corrector on one side and reaches the screen 0.
6) Focus the image above and see the enlarged image.

ここでミラー（６）による球面収差を説明する。Here, the spherical aberration caused by the mirror (6) will be explained.

いまターゲット（４）とミラー（６）の極端な例を第２
図に示し、ターゲット（４）上の７つの発光点Ａ。Now consider the second extreme example of target (4) and mirror (6).
As shown in the figure, seven light emitting points A on the target (4).

から出た光を考える。この光はミラー（６）の全面で反
射して、ミラー（６）の曲率中心０と点Ａ０を通る一本
の光軸２の線上に結像するのであるが、ミラー（６）上
の光軸２と交わる点Ｍ。の近くの点Ｍ工で反射した光（
実線）と、点Ｍ□よシ点Ｍ。から遠く離れた点Ｍ、で反
射した光（破線）を比べると、点Ｍ工の光の反射角θ、
け点Ｍ！！の光の反射角０より小さいため、点有で反射
した光は光軸２上のよル遠い点Ａ工で結像し、点Ｍ２で
反射した光はよシ近い点Ａ、で結像する。このような（
ラー（６）の球面収差は曲率中心０位置に球面収差補正
体（１３１を配置することで補正される。ＤＩち、この
球面収差補正体−は理想的にけ点有で反射した光を内側
に曲げて光軸２の点Ａ３で結像させ、点Ｍ２で反射した
光を外側に曲げて同じ点Ａ、で結像させる。而して点Ａ
３にスクリーンＯっを配置すれば鮮明な訣像が得られる
。Consider the light emitted from the This light is reflected on the entire surface of the mirror (6) and forms an image on a single optical axis 2 that passes through the center of curvature 0 of the mirror (6) and the point A0, but the light on the mirror (6) Point M intersects axis 2. The light reflected by the point M near the (
solid line) and point M□ to point M. Comparing the light reflected at point M, which is far away from point M (dashed line), we can see that the angle of reflection of light at point M is θ,
Point M! ! Since the angle of reflection of the light is smaller than 0, the light reflected at the point will be imaged at point A, which is far away on optical axis 2, and the light reflected at point M2 will be imaged at point A, which is much closer. . like this(
The spherical aberration of the curvature center (6) is corrected by placing a spherical aberration corrector (131) at the 0 position of the center of curvature. The light reflected at point M2 is bent outward to form an image at the same point A.Thus, point A
If you place a screen at 3, you can get a clear image.

とζろで、パルプ（１０）を高精度に製造しても、ミラ
ー（６）の集魚距離に微妙なバラツキがどうしてモ生じ
る。このバラツキは各部材の研磨精度や、組立精度、円
筒部材（８）の軸方向のＪ（さやターゲラ）（４ｊの曲
率などの各種の微妙なバラツキが複合されて生じる。例
えば、第、１図の実線のターゲット（４）とミラー（６
）が理想球面に研磨されているとしても、円ＷＪ部材（
８）の寸法のバラツキによってターゲット（４）が％Ｊ
図の鎖線で示すようにミラー（６）の方向にΔｌだけ位
ｌずれを起したとすると、位階ずれしたターゲット（４
１上の発光点Ａ。から出た光のミラー（６）の例えば点
Ｍ２での反射角０は理想時の０２より大きく、従って結
像点Ａ３は前記人２よシ距離りだけ遠くに煎れる。この
距離りはターゲット（４）のずれ量Δｌが数７００μに
対して数ａ単位の大きさと々って現れる。このようなパ
ルプ（１０Ｉの集魚距離のバラツキは小さな範囲内であ
れば球面収差補正体（１′４の凸レンズ（１３ｂ）の集
魚距離を変えて補正できる。そこで従来は上記バラツキ
に応じて集魚距離の異なる凸レンズ（１３ｂ）と一体化
した球面収差補正体端を段階的に＆″８１類用意してお
き、パルプ（ｌＯ）の７つ７つに対してその集魚距離を
測定して、その伯に最も近く１４合する球面収差補正体
０：１を組合せるようにしていた。しかし乍ら、このよ
うな段階的ルｌ整方法、でけ微調が難しくて、どうして
もパルプ（１０（と球面収差補正体端を組合せたものの
最終集魚距離にバラツキが生じ、解像度の改善が難しか
った。Even if the pulp (10) is produced with high precision using the ζ method, slight variations in the fish collection distance of the mirror (6) still occur. This variation is caused by a combination of various subtle variations such as the polishing accuracy of each member, the assembly accuracy, and the curvature of the cylindrical member (8) in the axial direction. solid line target (4) and mirror (6
) is polished to an ideal spherical surface, the circular WJ member (
8) Due to the variation in the dimensions, the target (4) is %J
As shown by the chain line in the figure, if a displacement of Δl occurs in the direction of the mirror (6), then the target (4
Luminous point A on 1. The reflection angle 0 of the light emitted from the mirror (6) at, for example, point M2 is larger than 02 at the ideal time, and therefore the imaging point A3 is further away from the person 2 by the distance. This distance appears to be a magnitude of several a units compared to the displacement amount Δl of the target (4) of several 700 μ. Such variations in the fish collection distance of pulp (10I) can be corrected by changing the fish collection distance of the spherical aberration corrector (1'4 convex lens (13b)) within a small range. 81 types of spherical aberration corrector ends integrated with convex lenses (13b) of different sizes are prepared in stages, and the fishing distances are measured for 7 pieces of pulp (lO), and the angles are determined. I tried to combine a spherical aberration corrector 0:1 with a spherical aberration corrector that matches 14 closest to Although the corrected body end was combined, there were variations in the final fish collection distance, making it difficult to improve the resolution.

零発すＪけかか石問題点ＫＧみてなされたもので、以下
零発男を上記パルプｔｌｏｌに適用した実施例を第Ｖ図
及び第５図に示してこれを説明する零発例の特徴はパル
プ（１０１のエンドプレート（５）の外周面上に締付力
Ｗ４整可能な１ｉｌｌ製パンＦ’０ηを締結し、このバ
ンドＱηの締付力でエンドプレート（５）を内側に変形
させてミラー（６）の見かけ上の曲率を強制的に変える
ことである。尚、ｖＪＶ図及び第５図の輪はバンドＱη
とエンドプレート（ｂ）の外周面の間に介在させたゴム
等のリング状緩衝材、（＋９４は緩衝材−とバンド０η
の間のｖＩ数論所に挾んで固定した断面り字状の１１１
吋金具で、この取付金具（１９）を介してパルプ（１０
ｊを外部のキャビネット等に取付ける。またバンドＱη
は両端の折曲部ｏｆ＞（ｌｆｒをネジ四で締め付ける構
造のリングで、エンドプレート（５）を全周から均等な
力で締め付ける。This was done by looking at the problem of zero generation, and the following is an example of applying zero generation to the above pulp troll, which will be explained in Figures V and 5. The characteristics of zero generation examples are as follows: A 1ill bread F'0η that can adjust the tightening force W4 is fastened on the outer peripheral surface of the end plate (5) of the pulp (101), and the end plate (5) is deformed inward by the tightening force of this band Qη. This is to forcibly change the apparent curvature of the mirror (6).The rings in the vJV diagram and Figure 5 correspond to the band Qη.
and a ring-shaped cushioning material such as rubber interposed between the outer peripheral surface of the end plate (b) (+94 is the cushioning material - and the band 0η
111 with a cursor-shaped cross section fixed between the vI number desks
Attach the pulp (10) through this mounting bracket (19).
Attach j to an external cabinet, etc. Also the band Qη
is a ring with a structure in which the bent portions of>(lfr) on both ends are tightened with four screws, and the end plate (5) is tightened with equal force from the entire circumference.

次に上記バンドＯηの締付力によるミラー（８）の曲率
調整の意味を説明する。例えば第３は１と同様に第２図
の５ｉ４線のターゲット（４）とオラー（６）を理想状
態とし、光軸から離れたミラー上の点Ｍ。Next, the meaning of adjusting the curvature of the mirror (8) by the tightening force of the band Oη will be explained. For example, in the third case, the target (4) and the optical axis (6) of the 5i4 line in FIG. 2 are set in an ideal state as in the case of the first point, and the point M is located on the mirror away from the optical axis.

の反射光は、曲率中心Ｏと交点Ｍとのなす直線に対して
等しい角０４で反射して点ム２で結像する。ところが鎖
線位置にターゲラ）　＋４”）が位置ずれを起したもの
とすると、ターゲット（４）上のＡｏ′より発した光け
Ｍ２で反射して曲率中心０と交点Ｍ。The reflected light is reflected at an angle 04 that is equal to the straight line formed by the center of curvature O and the point of intersection M, and forms an image at point M2. However, if the target (+4") is misaligned at the chain line position, it will be reflected by the light M2 emitted from Ao' on the target (4) and intersect with the center of curvature 0 and the point M.

とのなす直線に対して等しい角θ５で反射して点Ａで結
像し、点Ａ２よシ大きくずれる。そのためこの位置ずれ
に対し、バンド９７）をエンドプレート（５）に締め付
け、第に図の鎖線に示すように見かけ土の曲率中ル・０
をミラー（６）側に移動させる。すると位置ずれしたタ
ーゲラ）　（４１上の発光点Ａｏから出た光が変形した
ミラー（６）の点Ｍｄ（理想時のえラー（６）の点Ｍ２
に相当）で曲率中心０と交点くとの々す直線に対し等し
い角度θ６で反射して、点Ａ４近傍の点Ａ、に結像する
。この結像点Ａ４はミラー（０）を変形させない時の結
像点Ａ３に比べ、理想時の結像点Ａ、に大幅に近付く。It is reflected at an angle θ5 that is equal to the straight line formed by and forms an image at point A, which is significantly shifted from point A2. Therefore, to prevent this misalignment, the band 97) is tightened to the end plate (5), and as shown in the chain line in the figure, the apparent soil curvature is
to the mirror (6) side. Then, the position of the targera is shifted) (The point Md of the mirror (6) where the light emitted from the light emitting point Ao on 41 is deformed (The point M2 of the error (6) in the ideal case)
When the light intersects with the center of curvature 0 at an angle θ6 equal to the straight line, the light is reflected at a point A near the point A4. This imaging point A4 is much closer to the ideal imaging point A than the imaging point A3 when the mirror (0) is not deformed.

実際は実測しながらＡ点がＡ２点に一致するようにバン
ド０ηの給付力を加減してミラー（６）の曲率を微調整
する。このようにするとパルプｕＱｌのバラツキが組立
後に外部から補正され、光学的にほぼ均一な特性のパル
プ（１０１が得られる。In actuality, the curvature of the mirror (6) is finely adjusted by adjusting the applied force of the band 0η while making actual measurements so that point A coincides with point A2. In this way, variations in the pulp uQl are corrected from the outside after assembly, and a pulp (101) with almost optically uniform characteristics is obtained.

尚、本発明は上記実施例にのみ限定されるものではなく
、特にバンド（ｌηは二重、三重巻きタイプのものや、
取付金具（１９１と一体のものであってもよい。It should be noted that the present invention is not limited only to the above-mentioned embodiments, and in particular, the present invention is not limited to the above-mentioned embodiments.
It may be integrated with the mounting bracket (191).

以上説明したように、本発明によればパルプのミラーの
集点距舶が外部からバンドの締伺力によって微調整でき
るので、パルプの製造上の特性のバラツキが減少し、解
像度の大幅な向上が図れる。また球面収差補正体を多種
類設ける必要が無くて組立が簡略化され、ｔた設備管理
上に有利である。As explained above, according to the present invention, the focusing distance of the pulp mirror can be finely adjusted from the outside by the clamping force of the band, which reduces variations in pulp manufacturing characteristics and significantly improves resolution. can be achieved. Furthermore, there is no need to provide many types of spherical aberration correctors, which simplifies assembly and is advantageous in equipment management.

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

第１図は本発明の前提となる陰極線管の一例を示す側断
面図、第２図及び第３図ｔ′１９１５／図の陰極線管に
おける曲面収差を税引するための各状態での概略図、第
Ｖ図及び第５図は本発明の一実施例を示す一部断面側面
図及びＩ−Ｉ線に沿う断面図、第２図は本発明による陰
極線管の球面収差の改善を説明するための概略図である
ｆｉ＋・・フェースプレート、（４）・ツタ−ゲット、
（５）・・エンドプレート、（０）・・ミラー、（８）
・・円筒部材、（１０１・・パルプ、ａη・・バント。 特許出願人　　　新日本電気株式会社Fig. 1 is a side sectional view showing an example of a cathode ray tube which is the premise of the present invention, and Figs. 2 and 3 are schematic diagrams in each state for taxing the curved aberration in the cathode ray tube shown in t'1915/Fig. , V and 5 are a partially sectional side view and a sectional view taken along line I--I showing an embodiment of the present invention, and FIG. 2 is a diagram for explaining the improvement of spherical aberration of a cathode ray tube according to the present invention. This is a schematic diagram of fi+... face plate, (4) target,
(5)...End plate, (0)...Mirror, (8)
... Cylindrical member, (101... Pulp, aη... Bunt. Patent applicant Shin Nippon Electric Co., Ltd.

Claims (1)

【特許請求の範囲】[Claims] ｆｉ＋　　内面中央部にターゲットを有する同心メニス
カス状の７エースプレート及び内面に凹球面状のミラー
を有するエンドプレートを円ｍ部材の両端面に整合して
封着したパルプの、前記エンドプレートの外周面上に鋼
製バンドを拳回し、鋼製バンドの締付力によってミラー
の曲率を調整するようにしたことを特徴とする投写型陰
極線管。fi+ The outer circumferential surface of the end plate of a pulp in which a concentric meniscus-shaped 7-ace plate having a target at the center of the inner surface and an end plate having a concave spherical mirror on the inner surface are aligned and sealed to both end surfaces of a circular m member. A projection type cathode ray tube characterized in that a steel band is attached to the top of the tube and the curvature of the mirror is adjusted by the tightening force of the steel band.