JP3855275B2 - Funnel for cathode ray tube - Google Patents

Funnel for cathode ray tube Download PDF

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JP3855275B2
JP3855275B2 JP2004017170A JP2004017170A JP3855275B2 JP 3855275 B2 JP3855275 B2 JP 3855275B2 JP 2004017170 A JP2004017170 A JP 2004017170A JP 2004017170 A JP2004017170 A JP 2004017170A JP 3855275 B2 JP3855275 B2 JP 3855275B2
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funnel
cathode ray
axis
opening end
ray tube
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JP2004165170A (en
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浩 柿木
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Nippon Electric Glass Co Ltd
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Description

本発明は、陰極線管用ガラスバルブを構成するファンネルに関するものである。   The present invention relates to a funnel constituting a glass bulb for a cathode ray tube.

陰極線管用ガラスバルブは、画像が表示される前面のパネルと、その後方にあってパネルと封着してガラス外囲器を形成するファンネルとから構成される。図6に示すように、ファンネル1は、パネルと相似した輪郭形状を有するほぼ矩形の開口端部10、電子銃を格納する円筒形状のネック部11、偏向コイルを外装するヨーク部12、開口端部10からヨーク部12に向かって連続的に変化する漏斗状形状を有するボディー部13からなる。ヨーク部12とボディー部13との接続部は一般にTOR(Top Of Round)と呼ばれる。   The glass bulb for a cathode ray tube is composed of a front panel on which an image is displayed and a funnel that is behind the front panel and is sealed with the panel to form a glass envelope. As shown in FIG. 6, the funnel 1 includes a substantially rectangular opening end portion 10 having a contour shape similar to that of a panel, a cylindrical neck portion 11 for storing an electron gun, a yoke portion 12 for covering a deflection coil, and an opening end. The body portion 13 has a funnel-like shape continuously changing from the portion 10 toward the yoke portion 12. The connecting portion between the yoke portion 12 and the body portion 13 is generally called TOR (Top Of Round).

前記開口端部10に平行なボディー部13の横断面P(z)の輪郭形状は、開口端部10(z=0)付近では開口端部10とほぼ相似形の矩形をなし、ヨーク部12(z=T)付近では一般に円形となる。前記横断面P(z)の内外表面の輪郭形状は、それぞれ三つの円弧からなり、長辺を構成する円弧RL、短辺を構成する円弧RS及びこれらに接する円弧RDとからなる。   The contour shape of the cross section P (z) of the body portion 13 parallel to the opening end portion 10 is a rectangle substantially similar to the opening end portion 10 in the vicinity of the opening end portion 10 (z = 0). In the vicinity of (z = T), it is generally circular. The contour shape of the inner and outer surfaces of the transverse cross section P (z) is composed of three arcs, and consists of an arc RL constituting the long side, an arc RS constituting the short side, and an arc RD in contact with these.

対角軸(DA)が長軸(LA)となす角度d°は画像表示面のアスペクト比が4:3の場合、36.87°であり、アスペクト比が16:9の場合は、29.36°である。従来、前記の円弧RDの中心は、設計の便宜上、対角軸(DA)上に設定されており、従って、前記横断面P(z)の輪郭形状の最大外形部D(z)も対角軸(DA)上に存在する。斯様なファンネル1においては、ボディー部13の対角軸(DA)付近で輪郭形状が急激に変化するため、対角軸の特に長辺側に、対角軸にほぼ平行な稜線状の角立ち形状が形成される。特に、前記アスペクト比が16:9の横長タイプの場合は、長辺と短辺の比がより大きくなることから、角立ち形状が際立ってくる。   The angle d ° between the diagonal axis (DA) and the long axis (LA) is 36.87 ° when the aspect ratio of the image display surface is 4: 3, and 29. when the aspect ratio is 16: 9. 36 °. Conventionally, the center of the circular arc RD is set on the diagonal axis (DA) for convenience of design, and therefore the maximum outer shape D (z) of the contour shape of the cross section P (z) is also diagonal. Exists on the axis (DA). In such a funnel 1, the contour shape changes abruptly near the diagonal axis (DA) of the body portion 13, so that the corner of the ridge line that is substantially parallel to the diagonal axis, particularly on the long side of the diagonal axis. A standing shape is formed. In particular, in the case of a horizontally long type having an aspect ratio of 16: 9, the ratio of the long side to the short side becomes larger, so that the square standing shape is conspicuous.

ところで、通常、ファンネルはプレス成形により製造されるが、図7に示すように、底型20内に一定量の溶融ガラス塊を供給した後、上型(図示せず)を下降させて底型20と上型の間隙に溶融ガラス塊を押延して成形する。図7のファンネル1は押延を完了(フィルアップ)した状態を示し、図8には底型20内にあるファンネル1の押延途中の状態を示す。図8の板状の矢印14にガラスが押延される方向を示すが、溶融ガラスは、短軸(SA)において最も早く開口端部側に押延され、続いて長軸(LA)側、最後に対角軸(DA)側の順番に押延される。   By the way, the funnel is usually manufactured by press molding. As shown in FIG. 7, after supplying a certain amount of molten glass lump into the bottom mold 20, the upper mold (not shown) is lowered to lower the bottom mold. A molten glass lump is pushed into the gap between the upper mold 20 and the upper mold. The funnel 1 shown in FIG. 7 shows a state where the stretching has been completed (filled up), and FIG. 8 shows a state where the funnel 1 in the bottom mold 20 is being pushed. The plate-like arrow 14 in FIG. 8 shows the direction in which the glass is stretched, but the molten glass is stretched to the opening end side earliest in the short axis (SA), followed by the long axis (LA) side, Finally, they are stretched in the order of the diagonal axis (DA).

前記したように、ファンネルの対角軸付近には、対角軸にほぼ平行な稜線状の角立ち形状が形成されるが、この形状はファンネルがプレス成形される場合にガラスの押延を阻害する。即ち、図8の板状の矢印14で示したように、対角軸方向においてはガラスが短軸側と長軸側から回り込むように伸ばされるが、角立ち形状の部分で押延抵抗が増大するので、他の部分に比べて開口端部までガラスが充填されるフィルアップが遅延する。   As described above, a ridge-lined vertical shape almost parallel to the diagonal axis is formed near the diagonal axis of the funnel, but this shape hinders the glass from being pushed when the funnel is press-molded. To do. That is, as indicated by the plate-shaped arrow 14 in FIG. 8, in the diagonal axis direction, the glass is stretched so as to wrap around from the short axis side and the long axis side, but the drag resistance is increased in the cornered portion. Therefore, the fill-up in which the glass is filled up to the opening end portion is delayed as compared with other portions.

このように、対角軸でのフィルアップが遅れるため、対角軸上付近の開口端面部に充填されるガラスの温度が低下し、ガラスに微小なクラックを生じたり、フィルアップに要する時間やプレス圧力が増大するという不都合を生じる。また、斯様な対角軸付近の稜線状の角立ち形状は強度面からも不利である。即ち、ファンネルの取り扱いによって生じる擦り傷が角立ち部分に集中しやすく、またファンネルを陰極線管とするときには内部が真空とされるため、内外気圧差によって生じる真空応力も角立ち部分に集中しやすい。このような擦り傷や真空応力の程度によっては陰極線管が破壊に至る虞があった。   In this way, since the fill-up on the diagonal axis is delayed, the temperature of the glass filled in the opening end surface near the diagonal axis is lowered, and microcracks are generated in the glass, the time required for the fill-up, The disadvantage is that the press pressure increases. In addition, such a ridge-like angled shape near the diagonal axis is disadvantageous from the viewpoint of strength. That is, scratches caused by handling the funnel are likely to concentrate on the corners, and when the funnel is a cathode ray tube, the inside is evacuated, so that the vacuum stress caused by the difference between the internal and external pressures is also likely to concentrate on the corners. Depending on the degree of such scratches and vacuum stress, the cathode ray tube may be destroyed.

そこで、本発明の目的は、ファンネルのボディー部をプレス成形に適した形状とし、さらに、強度面でも有利な陰極線管用ファンネルを提供することである。   Accordingly, an object of the present invention is to provide a funnel for a cathode ray tube which has a body portion of a funnel suitable for press molding and is advantageous in terms of strength.

本発明は前述の課題を解決するためになされたものであり、ほぼ矩形の開口端部と、電子銃を格納するネック部と、偏向コイルを外装するヨーク部と、前記開口端部とヨーク部の間を構成し開口端部からヨーク部に向かって連続的に変化する漏斗状形状を有するボディー部からなる陰極線管用ファンネルにおいて、前記開口端部に平行な任意の横断面P(z)での前記ボディー部外表面及び/又は内表面の最大外形部D(z)が軸心(C)回りに長軸(LA)となす角度をα(z)°とし、対角軸(DA)が長軸(LA)となす角度をd°とするとき、d<α(z)<90の関係を有するボディー部を含むことを特徴とする陰極線管用ファンネルを提供する。   The present invention has been made to solve the above-described problems, and has a substantially rectangular opening end, a neck portion for storing an electron gun, a yoke portion for sheathing a deflection coil, the opening end portion and the yoke portion. In a funnel for a cathode ray tube comprising a body portion having a funnel shape that continuously changes from the opening end portion toward the yoke portion, at an arbitrary cross section P (z) parallel to the opening end portion. The angle formed by the outermost surface D (z) of the body part outer surface and / or inner surface with the long axis (LA) around the axis (C) is α (z) °, and the diagonal axis (DA) is long. Provided is a funnel for a cathode ray tube including a body portion having a relationship of d <α (z) <90, where d ° is an angle formed with an axis (LA).

また、本発明の前記陰極線管用ファンネルは前記角度α(z)°が開口端部(z=0)からヨーク部との接続部(z=T)まで連続的に変化する非単調増加または減少関数で表され、一つの極大値を有することを特徴とする。   In addition, the funnel for a cathode ray tube according to the present invention has a non-monotonic increase or decrease function in which the angle α (z) ° continuously changes from the opening end (z = 0) to the connection with the yoke (z = T). And is characterized by having one maximum value.

さらにまた、本発明の陰極線管用ファンネルは前記角度α(z)°と角度d°が0<|α(z)−d|<10であることを特徴とする。   Furthermore, the funnel for a cathode ray tube of the present invention is characterized in that the angle α (z) ° and the angle d ° are 0 <| α (z) −d | <10.

また、前記開口端部に平行な任意の横断面P(z)での前記ボディー部外表面及び/又は内表面の最大外形部D(z)を長軸(LA)と短軸(SA)とで定義される直角座標上に(Dx、Dy)で表すとき、zが0からTまで変化する範囲においてDxとDyとが下記の式を満たす関係にあることを特徴とする。   Further, the maximum outer portion D (z) of the outer surface and / or the inner surface of the body portion at an arbitrary cross section P (z) parallel to the opening end is defined as a major axis (LA) and a minor axis (SA). When represented by (Dx, Dy) on the Cartesian coordinate system defined by (2), Dx and Dy are in a relationship satisfying the following formula in a range where z varies from 0 to T.

Dy=A0+A1・Dx+A2・Dx2+・・・
n-1・Dxn-1+An・Dxn
ただし、A0、A1、・・・、An-1、Anは定数であり、nは自然数とする。
Dy = A 0 + A 1 · Dx + A 2 · Dx 2 + ...
A n-1 · Dx n-1 + A n · Dx n
However, A 0 , A 1 ,..., A n−1 , A n are constants, and n is a natural number.

本発明においては、ファンネルのボディー部の最大外形部D(z)を形成する円弧RDの中心をファンネルの対角軸より長辺側に離れて設けたので、最大外形部D(z)もファンネルの対角軸より長辺側に移動し、そのために、短辺を構成する円弧の曲率半径を減少させることができ、対角軸付近の稜線状の角立ち形状が緩和される。この結果、先記したファンネルの成形性が改善され、さらに、角立ち部分に集中する擦り傷や真空応力によるファンネルの破壊の虞が抑制される。   In the present invention, the center of the arc RD that forms the maximum outer shape D (z) of the body portion of the funnel is provided on the longer side from the diagonal axis of the funnel, so the maximum outer shape D (z) is also the funnel. Therefore, the radius of curvature of the arc constituting the short side can be reduced, and the ridge-like angled shape near the diagonal axis is relaxed. As a result, the moldability of the funnel described above is improved, and the possibility of the funnel breaking due to scratches or vacuum stress concentrated on the corners is suppressed.

開口端面部からヨーク部の間を構成するボディー部は、開口端部からヨーク部に向かって連続的に滑らかに変化する漏斗状形状とするのが、ガラスの押延を円滑にし、成形性を改善するのに好都合である。従って、最大外形部が対角軸から軸心回りに離間する角度、即ち前記[α(z)−d]については+/−10°未満とし、好ましくは+/−5°未満とする。|α(z)−d|が10以上になると、開口端部やヨーク部との接続が困難となる。   The body part that forms between the opening end surface part and the yoke part has a funnel-like shape that continuously and smoothly changes from the opening end part toward the yoke part, which facilitates the glass stretching and improves the moldability. Convenient to improve. Accordingly, the angle at which the maximum outer shape portion is separated from the diagonal axis around the axis, that is, [α (z) −d] is less than +/− 10 °, preferably less than +/− 5 °. When | α (z) −d | is 10 or more, it becomes difficult to connect the opening end and the yoke.

また、角度α(z)°は開口端部(z=0)からヨーク部との接続部(z=T)まで連続的に滑らかに変化する非単調増加または減少関数とし、開口端部とヨーク部との間で一つの極小値または極大値を有する形状とする。極小値や極大値を二つ以上とすると形状が複雑になるので、プレス成形用金型の加工が困難となり、成形性の改善もできなくなる。   The angle α (z) ° is a non-monotonically increasing or decreasing function that continuously and smoothly changes from the opening end (z = 0) to the connecting portion (z = T) with the yoke. A shape having one minimum value or maximum value with respect to the part is used. If the minimum value or the maximum value is set to two or more, the shape becomes complicated, so that it is difficult to process the press mold, and the moldability cannot be improved.

さらに、開口端部(z=0)からヨーク部との接続部(z=T)までの任意の横断面P(z)における前記ボディー部外表面及び/又は内表面の最大外形部D(z)を長軸(LA)と短軸(SA)とで定義される直角座標上に(Dx、Dy)で表すとき、Dy=A0+A1・Dx+A2・Dx2+・・・An-1・Dxn-1+An・Dxn(ただし、A0、A1、・・・、An-1、Anは定数であり、nは自然数とする。)の多項式で関係付けることにより、開口端部からヨーク部までの最大外形部の形状の変化を連続的にまた滑らかにすることができる。 Further, the maximum outer shape D (z) of the outer surface and / or the inner surface of the body portion in an arbitrary cross section P (z) from the opening end portion (z = 0) to the connection portion (z = T) with the yoke portion. ) when the expressed by the major axis (LA) and a minor axis (SA) on the rectangular coordinate is defined out with (Dx, Dy), Dy = a 0 + a 1 · Dx + a 2 · Dx 2 + ··· a n- 1 · Dx n-1 + A n · Dx n (where A 0 , A 1 ,..., A n-1 , A n are constants, and n is a natural number). The change in the shape of the maximum outer shape from the open end to the yoke can be made smooth continuously.

なお、前記多項式の次数は2または3とするのが、好ましい。即ち、次数が1では前記した最大外形部の形状の変化が直線的になり、また、次数が4以上では不必要に複雑になる。   The degree of the polynomial is preferably 2 or 3. That is, when the order is 1, the change in the shape of the maximum outer shape is linear, and when the order is 4 or more, it is unnecessarily complicated.

本発明の陰極線管用ファンネルによれば、ファンネルのボディー部をプレス成形に適した形状としたので、プレス成形時のガラスの押延が円滑となり、ガラスの押延の遅延に起因して生じる対角軸上付近の開口端面部の微小なクラックが抑制され、またフィルアップに要する時間やプレス圧力が増大するという不都合も解消できる。   According to the funnel for a cathode ray tube of the present invention, since the body portion of the funnel has a shape suitable for press molding, the glass is smoothly pressed during press molding, and the diagonal generated due to the delay of the glass stretching. Minute cracks at the opening end face near the axis are suppressed, and the disadvantage of increasing the time required for fill-up and pressing pressure can be solved.

また、ファンネルの取り扱いによって、ファンネルボディー部の対角軸外表面に生じる擦り傷や陰極線管とする段階で発生する真空応力が分散されるので、ファンネルや陰極線管の破壊の虞も抑制できるという優れた効果を奏するものである。   In addition, the handling of the funnel disperses the scratches generated on the outer surface of the diagonal axis of the funnel body and the vacuum stress generated at the stage of forming the cathode ray tube, so that the possibility of destruction of the funnel and cathode ray tube can be suppressed. There is an effect.

以下、図1乃至図4に基づいて、本発明にかかる陰極線管用ファンネル(サイズ76cm、アスペクト比16:9、偏向角120°、ネック外径29.1mm)の実施例について説明する。なお、以下の説明において、先記した図6乃至図8に示すものと共通の構成要件については、同一符号を付して、その詳細な説明を省略する。   Hereinafter, an embodiment of a funnel for a cathode ray tube (size 76 cm, aspect ratio 16: 9, deflection angle 120 °, neck outer diameter 29.1 mm) according to the present invention will be described with reference to FIGS. In the following description, the same constituent elements as those shown in FIGS. 6 to 8 are denoted by the same reference numerals, and detailed description thereof is omitted.

図1は本発明の陰極線管用ファンネル正面図の第1象限のみを示したものであり、2点鎖線は本実施例の横断面P(z)の外表面輪郭形状、破線は従来の横断面の外表面輪郭形状を表している。例えば、z=60(mm)における三つの円弧RL、RD、RSの値は、破線で示した従来の外表面輪郭形状ではRL=4072mm、RD=40mm、RS=636mmであり、2点鎖線で示した本実施例の外表面輪郭形状ではRL=1459mm、RD=40mm、RS=933mmである。本明細書において説明の簡略化のために、陰極線管用ファンネルの第1象限のみを示したが、第2乃至第4象限もそれぞれ第1象限と軸対称の関係となるように構成されている。   FIG. 1 shows only the first quadrant of the front view of the funnel for a cathode ray tube according to the present invention. The two-dot chain line shows the outer surface contour shape of the transverse section P (z) of this embodiment, and the broken line shows the conventional transverse section. It represents the outer surface contour shape. For example, the values of three arcs RL, RD, and RS at z = 60 (mm) are RL = 4072 mm, RD = 40 mm, and RS = 636 mm in the conventional outer surface contour shape indicated by a broken line, and are two-dot chain lines. In the illustrated outer surface contour shape of the present embodiment, RL = 1449 mm, RD = 40 mm, and RS = 933 mm. For simplification of the description in this specification, only the first quadrant of the cathode ray tube funnel is shown, but the second to fourth quadrants are also configured to have an axially symmetric relationship with the first quadrant.

また、前記したz=60mmにおける横断面P(z)の外表面輪郭形状に関して、ファンネルの軸心(C)からの距離を従来の輪郭形状(表1にPoと記す)と本実施例の輪郭形状(表1にPpと記す)とを比較して表1に示す。表1には、長軸(LA)から短軸(SA)まで軸心(C)回りに10°毎に計算した設計値(単位:mm)を示す。   Further, regarding the outer surface contour shape of the cross section P (z) at z = 60 mm, the distance from the funnel axis (C) is defined as the conventional contour shape (indicated by Po in Table 1) and the contour of this embodiment. Table 1 compares the shapes (denoted as Pp in Table 1). Table 1 shows design values (unit: mm) calculated every 10 ° around the axis (C) from the major axis (LA) to the minor axis (SA).

Figure 0003855275
Figure 0003855275

上記から明らかなように、本実施例の横断面P(z)は長辺側の円弧RLの曲率半径が大きく減少し、輪郭形状の軸心からの距離も軸心(C)回りに40°の値で16mm程丸みをおびた形状となっており、対角軸付近の角立ち形状が緩和されているのが分かる。なお、説明の簡略化のため図示が省略されているが、前記横断面P(z)の内表面輪郭形状最大外形部が軸心(C)回りに長軸(LA)となす角度は外表面と同じ角度となるように設計されている。   As is clear from the above, in the cross section P (z) of the present embodiment, the radius of curvature of the arc RL on the long side is greatly reduced, and the distance from the contour axis is 40 ° around the axis (C). The value is a rounded shape of about 16 mm, and it can be seen that the standing shape near the diagonal axis is relaxed. In addition, although illustration is abbreviate | omitted for simplification of description, the angle which the inner surface contour shape largest external shape part of the said cross section P (z) makes with a long axis (LA) around an axis (C) is an outer surface Is designed to have the same angle as

本発明者の研究の結果、ボディー部の横断面の輪郭形状において、長辺側或いは短辺側の円弧が3000mmを超える曲率半径からなる場合は、先記した対角軸付近の角立ち形状が強くなり、本発明を実施することによる角立ち形状の緩和の効果が顕著に現れることが分かった。   As a result of the inventor's research, in the contour shape of the cross section of the body part, when the long side or short side arc has a radius of curvature exceeding 3000 mm, the above-mentioned angled shape near the diagonal axis is It became strong and it turned out that the effect of relaxation of the standing shape by implementing this invention appears notably.

図2は、軸心方向の距離zが開口端部(z=0mm)からヨーク部との接続部(z=125mm)まで変化するときの、α(z)と[α(z)−d]の曲線を表す。本実施例のファンネルではzが10mm〜125mmの範囲で最大外形部D(z)が対角軸(29.36°)よりも長軸(LA)側にあり、zが50mm〜90mmの範囲で[α(z)−d]が−4°の極小値を有していることが分かる。また、開口端部(z=0mm)からヨーク部との接続部(z=125mm)まで、α(z)は滑らかに連続的に変化する曲線であり、単調な増加または減少関数ではないことが分かる。   FIG. 2 shows that α (z) and [α (z) −d] when the axial distance z changes from the opening end (z = 0 mm) to the connecting portion (z = 125 mm) with the yoke. Represents the curve. In the funnel of the present embodiment, z is in the range of 10 mm to 125 mm, the maximum outer shape D (z) is on the long axis (LA) side from the diagonal axis (29.36 °), and z is in the range of 50 mm to 90 mm. It can be seen that [α (z) −d] has a minimum value of −4 °. In addition, α (z) is a curve that smoothly and continuously changes from the opening end (z = 0 mm) to the connection with the yoke (z = 125 mm), and is not a monotonous increase or decrease function. I understand.

さらに図3には、前記したファンネルと同一サイズのファンネルに関する本発明の他の実施例を示す。即ち、図2に示した例はヨーク部が丸型のものであるのに対して、図3はヨーク部が矩形状であり、所謂、角型ヨーク部を有するものである。   Further, FIG. 3 shows another embodiment of the present invention relating to a funnel having the same size as the above funnel. That is, in the example shown in FIG. 2, the yoke portion has a round shape, whereas in FIG. 3, the yoke portion has a rectangular shape and has a so-called square yoke portion.

陰極線管の消費電力を低減させるために、ヨーク部を角型としたものが開発されているが、これは電子ビームが衝突しやすい対角部内径はできるだけ大きくして電子ビームの衝突を避け、長軸及び短軸近傍の内径をできるだけ小さくして偏向コイルを電子ビームに接近させることにより、電子ビームの偏向を効率化するものである。   In order to reduce the power consumption of the cathode ray tube, a yoke with a square shape has been developed. This is because the inner diameter of the diagonal portion where the electron beam is likely to collide is made as large as possible to avoid collision of the electron beam, By making the inner diameter in the vicinity of the major axis and the minor axis as small as possible and making the deflection coil approach the electron beam, the deflection of the electron beam is made efficient.

斯様な角型ヨーク部を有するファンネルでは、陰極線管として内部を真空にしたときの耐気圧強度を考慮して、極端な矩形化は避けなければならない。そこで、必要な耐気圧強度を保持しながら消費電力を低減するために、偏向コイルが外装されるヨーク部をネック側は円形にし、パネル方向に次第に円形から長軸及び短軸以外の方向に最大径を有する非円形の形状として、ヨーク部とボディー部との接続部では最大径部が長軸となす角度を、ファンネルの開口端部の最大外形部が長軸となす角度、即ちファンネルの対角軸の角度と、異なる角度にする提案がなされている。   In the funnel having such a square yoke portion, extreme rectangularization must be avoided in consideration of the pressure resistance when the inside of the cathode ray tube is evacuated. Therefore, in order to reduce power consumption while maintaining the required pressure resistance strength, the neck part of the yoke part on which the deflection coil is mounted is made circular on the neck side, and gradually increases from the circular to the direction other than the major axis and minor axis in the panel direction. As a non-circular shape having a diameter, the angle between the largest diameter portion and the major axis at the connection portion between the yoke portion and the body portion, and the angle between the largest outer shape portion at the opening end of the funnel and the major axis, that is, the funnel pair Proposals have been made to make the angle different from the angle of the angular axis.

図3において、前記の角型ヨーク部のヨーク部とボディー部との接続部(z=125mm)では、横断面の外表面輪郭形状の最大外形部D(z)が長軸となす角度は38°とされており、zが90mm〜125mmの範囲で最大外形部D(z)のα(z)は25.36°から38°まで変化している。   In FIG. 3, in the connecting portion (z = 125 mm) between the yoke portion and the body portion of the square yoke portion, the angle formed by the maximum outer shape portion D (z) of the outer surface contour shape in the cross section with the major axis is 38. The angle α (z) of the maximum outer shape D (z) varies from 25.36 ° to 38 ° in the range of z from 90 mm to 125 mm.

なお、角型ヨーク部を有するファンネルであっても、ヨーク部とボディー部との接続部において最大径部が長軸となす角度を、ファンネルの開口端部の最大外形部が長軸となす角度、即ちファンネルの対角軸の角度と、同一の角度としたものは図2に示した実施例がそのまま適用できる。   Note that even in a funnel having a square yoke, the angle between the major axis and the major axis of the maximum diameter of the connecting portion between the yoke and body is the major axis. That is, the embodiment shown in FIG. 2 can be applied as it is to the same angle as the angle of the diagonal axis of the funnel.

さらに図4には、本発明にかかる他の陰極線管用ファンネル(サイズ86cm、アスペクト比16:9、偏向角106°、ネック外径32.5mm)の実施例について説明する。   FIG. 4 shows another embodiment of the funnel for cathode ray tube (size 86 cm, aspect ratio 16: 9, deflection angle 106 °, neck outer diameter 32.5 mm) according to the present invention.

図4において、軸心方向の距離zが開口端部(z=0mm)からヨーク部との接続部(z=225mm)まで変化するときの最大外形部D(z)の軌跡をLAとSAとの直角座標上に、実施例と従来例を対比して示す。   In FIG. 4, the locus of the maximum external portion D (z) when the distance z in the axial direction changes from the opening end (z = 0 mm) to the connecting portion (z = 225 mm) with the yoke is LA and SA. The example is compared with the conventional example on the rectangular coordinates.

この実施例では、例えば、z=60(mm)における図1に示す三つの円弧RL、RD、RSの値は、破線で示した従来の外表面輪郭形状ではRL=3112mm、RD=37mm、RS=836mmであり、2点鎖線で示した本実施例の外表面輪郭形状ではRL=2676mm、RD=37mm、RS=888mmとなっており、長辺側の円弧RLの曲率半径が大きく減少していることが分かる。   In this embodiment, for example, the values of the three arcs RL, RD, and RS shown in FIG. 1 at z = 60 (mm) are RL = 3112 mm, RD = 37 mm, and RS in the conventional outer surface contour shape indicated by the broken line. = 836 mm, and in the outer surface contour shape of the present embodiment shown by a two-dot chain line, RL = 2676 mm, RD = 37 mm, and RS = 888 mm, and the radius of curvature of the arc RL on the long side is greatly reduced. I understand that.

このとき、前記したz=60mmにおける横断面P(z)の外表面輪郭形状に関して、ファンネルの軸心(C)からの距離を従来の輪郭形状と本実施例の輪郭形状とで先記した例と同様に比較したところ、輪郭形状の軸心からの距離は軸心(C)回りに40°の値で2.7mm程丸みをおびた形状となっており、対角軸付近の角立ち形状が緩和されているのが分かった。   At this time, with respect to the outer surface contour shape of the cross section P (z) at z = 60 mm, the distance from the funnel axis (C) is previously described in the conventional contour shape and the contour shape of the present embodiment. As a comparison, the distance from the axis of the contour shape is a rounded shape of about 2.7 mm around the axis (C) with a value of 40 °. Was found to be relaxed.

さらに図2に対応するα(z)と[α(z)−d]の曲線を調べたところ、本実施例のファンネルでは、軸心方向の距離zが開口端部(z=0mm)からヨーク部との接続部(z=225mm)まで変化するとき、zが10mm〜225mmの範囲で最大外形部が対角軸(29.36°)よりも長軸(LA)側にあり、zが210mmのところで[α(z)−d]が−3.8°の極小値を有していることが分かった。   Further, when the curves of α (z) and [α (z) −d] corresponding to FIG. 2 were examined, in the funnel of the present example, the distance z in the axial direction was from the opening end (z = 0 mm) to the yoke. The maximum outer shape is closer to the long axis (LA) than the diagonal axis (29.36 °) and z is 210 mm when z is changed to the connecting portion (z = 225 mm). By the way, it was found that [α (z) -d] has a minimum value of −3.8 °.

本実施例では最大外形部D(z)を長軸(LA)と短軸(SA)とで定義される直角座標上に(Dx、Dy)で表し、zが0から225mmまで変化する範囲においてDxとDyとが、下記の2次式を満たす関係にしてある。即ち、
Dy=A0+A1・Dx+A2・Dx2
ただし、A0=9.748055E+00
1=3.523432E−01
2=4.684941E−04
In the present embodiment, the maximum outer shape portion D (z) is represented by (Dx, Dy) on a rectangular coordinate defined by the major axis (LA) and the minor axis (SA), and in a range where z varies from 0 to 225 mm. Dx and Dy satisfy the following quadratic expression. That is,
Dy = A 0 + A 1 · Dx + A 2 · Dx 2
However, A 0 = 9.748055E + 00
A 1 = 3.523432E-01
A 2 = 4.684941E-04

以上の説明から明らかなように、本実施例のファンネルは、ボディー部の対角軸付近の横断面輪郭形状を従来のファンネルに比べて滑らかな丸みをおびた形状としたので、ファンネルの成形時にガラスの押延が円滑となることが分かる。   As is clear from the above description, the funnel of the present embodiment has a cross-sectional contour shape near the diagonal axis of the body portion that is smoother round than the conventional funnel, so when forming the funnel It can be seen that the glass is smoothed.

本実施例では、ファンネルのボディー部の最大外形部を形成する円弧RDの中心をファンネルの対角軸より短辺側に離れて設けることにより、長辺の曲率半径を減少させて、対角軸付近の長辺側に生じる稜線状の角立ち形状を緩和したが、ファンネルの形状によっては、必要に応じて図5に示すように、円弧RDの中心をファンネルの対角軸より長辺側に離れて設けることにより、短辺の曲率半径を減少させて、対角軸付近の短辺側に生じる稜線状の角立ち形状を緩和できることは明らかである。   In this embodiment, the center of the arc RD that forms the maximum outer shape of the body part of the funnel is provided on the short side from the diagonal axis of the funnel to reduce the radius of curvature of the long side, thereby reducing the diagonal axis. Although the ridge-lined vertical standing shape generated on the long side in the vicinity was relaxed, depending on the funnel shape, as shown in FIG. 5, the center of the arc RD is placed on the long side from the diagonal axis of the funnel. It is clear that by providing them apart, it is possible to reduce the radius of curvature of the short side and relax the ridge-like angled shape formed on the short side near the diagonal axis.

また、本実施例ではファンネルボディー部の内外面ともに、最大外形部を形成する円弧RDの中心をファンネルの対角軸より離れて設けたが、ファンネルの大きさや、偏向角等の条件により、適宜、本発明を外面または内面のみに実施してもよい。さらに、内外面ともに最大外形部を形成する円弧RDの中心をファンネルの対角軸より離れて設ける場合においても、本明細書中に前記したα(z)やDx、Dyの関係式は内外面で同一でないものをも含む意味である。   Further, in this embodiment, the center of the arc RD that forms the maximum outer shape portion is provided apart from the diagonal axis of the funnel on both the inner and outer surfaces of the funnel body portion, but depending on conditions such as the size of the funnel and the deflection angle, as appropriate. The present invention may be implemented only on the outer surface or the inner surface. Further, even when the center of the arc RD that forms the maximum outer shape on both the inner and outer surfaces is provided away from the diagonal axis of the funnel, the relational expressions of α (z), Dx, and Dy described in this specification are the inner and outer surfaces. Including meanings that are not identical.

本発明の陰極線管用ファンネル正面図の第1象限図である。It is a 1st quadrant figure of the funnel front view for cathode ray tubes of this invention. 本発明の陰極線管用ファンネルのボディー部横断面において、外表面輪郭形状のα(z)の曲線を示すグラフ(A)と、[α(z)−d]の曲線を示すグラフ(B)である。In the cross section of the body part of the cathode ray tube funnel of the present invention, there are a graph (A) showing an α (z) curve of an outer surface contour shape and a graph (B) showing a curve of [α (z) -d]. . 本発明の他の実施例を示す陰極線管用ファンネルのボディー部横断面において、外表面輪郭形状のα(z)の曲線を示すグラフ(A)と、[α(z)−d]の曲線を示すグラフ(B)である。In the cross section of the body part of the funnel for a cathode ray tube showing another embodiment of the present invention, a graph (A) showing a curve of α (z) of the outer surface contour shape and a curve of [α (z) -d] are shown. It is a graph (B). 本発明の陰極線管用ファンネル背面図において、最大外形部D(z)の軌跡を示す第1象限図である。In the rear view of the funnel for a cathode ray tube of the present invention, it is a first quadrant showing a locus of the maximum outer shape portion D (z). 第2の本発明の陰極線管用ファンネルを示す正面図の第1象限図である。It is the 1st quadrant figure of the front view which shows the funnel for cathode ray tubes of 2nd this invention. 従来の陰極線管用ファンネルの正面図(A)と側面図(B)である。It is the front view (A) and side view (B) of the conventional funnel for cathode ray tubes. 陰極線管用ファンネルをプレス成形し、押延完了(フィルアップ)した状態を示す要部断面斜視図である。It is a principal part cross-section perspective view which shows the state which press-molded the funnel for cathode ray tubes, and was completed (fill-up). 陰極線管用ファンネルをプレス成形し、押延途中の状態を示す要部断面斜視図である。It is a principal part cross-section perspective view which shows the state in the middle of the press-molding of the funnel for cathode ray tubes.

符号の説明Explanation of symbols

1 陰極線管用ファンネル
10 開口端面部
11 ネック部
12 ヨーク部
13 ボディー部
14 板状の矢印
20 底型
P(z) 横断面
D(z) 最大外形部
DESCRIPTION OF SYMBOLS 1 Funnel for cathode ray tubes 10 Open end surface part 11 Neck part 12 Yoke part 13 Body part 14 Plate-shaped arrow 20 Bottom type P (z) Cross section D (z) Maximum external part

Claims (4)

ほぼ矩形の開口端部と、電子銃を格納するネック部と、偏向コイルを外装するヨーク部と、前記開口端部とヨーク部の間を構成し開口端部からヨーク部に向かって連続的に変化する漏斗状形状を有するボディー部からなる陰極線管用ファンネルにおいて、前記開口端部に平行な任意の横断面P(z)での前記ボディー部外表面及び/又は内表面の最大外形部D(z)が軸心(C)回りに長軸(LA)となす角度をα(z)°とし、対角軸(DA)が長軸(LA)となす角度をd°とするとき、d<α(z)<90の関係を有するボディー部を含むことを特徴とする陰極線管用ファンネル。 A substantially rectangular opening end, a neck portion for storing an electron gun, a yoke portion for sheathing a deflection coil, and a space between the opening end portion and the yoke portion, and continuously from the opening end portion toward the yoke portion In a funnel for a cathode ray tube comprising a body portion having a changing funnel shape, the maximum outer portion D (z) of the outer surface and / or inner surface of the body portion at an arbitrary cross section P (z) parallel to the opening end portion. ) Is defined as α (z) ° and the angle formed between the diagonal axis (DA) and the long axis (LA) is d °. (Z) A funnel for a cathode ray tube including a body portion having a relationship of <90. 前記角度α(z)°が開口端部(z=0)からヨーク部との接続部(z=T)まで連続的に変化する非単調増加または減少関数で表され、一つの極大値を有することを特徴とする請求項1に記載の陰極線管用ファンネル。 The angle α (z) ° is expressed by a non-monotonically increasing or decreasing function that continuously changes from the opening end (z = 0) to the connecting portion (z = T) with the yoke portion, and has one maximum value. The funnel for a cathode ray tube according to claim 1. 前記角度α(z)°と角度d°が0<|α(z)−d|<10であることを特徴とする請求項2に記載の陰極線管用ファンネル。 3. The funnel for a cathode ray tube according to claim 2, wherein the angle [alpha] (z) [deg.] And the angle d [deg.] Satisfy 0 <| [alpha] (z) -d | <10. 前記開口端部に平行な任意の横断面P(z)での前記ボディー部外表面及び/又は内表面の最大外形部D(z)を長軸(LA)と短軸(SA)とで定義される直角座標上に(Dx、Dy)で表すとき、zが0からTまで変化する範囲においてDxとDyとが下記の式を満たす関係にあることを特徴とする請求項3に記載の陰極線管用ファンネル。
Dy=A0+A1・Dx+A2・Dx2+・・・
n-1・Dxn-1+An・Dxn
ただし、A0、A1、・・・、An-1、Anは定数であり、nは自然数とする。

The body body outer surface and / or the maximum outer shape D (z) of the inner surface at an arbitrary cross section P (z) parallel to the opening end is defined by a major axis (LA) and a minor axis (SA). 4. The cathode ray according to claim 3, wherein, when represented by (Dx, Dy) on a rectangular coordinate, Dx and Dy satisfy the following expression in a range where z varies from 0 to T: 5. Funnel for pipe.
Dy = A 0 + A 1 · Dx + A 2 · Dx 2 + ...
A n-1 · Dx n-1 + A n · Dx n
However, A 0 , A 1 ,..., A n−1 , A n are constants, and n is a natural number.

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