Nippon Electric Glass Co., Ltd.

Hiroshi Kakigi

Masaya Kyono

A body portion of the funnel has a first region of dimension h, the dimension h being measured from the seal edge surface in a direction parallel to a tube axis, and a second region excluding the first region. The second region has a thickness relatively smaller than the thickness of the first region, so that a boundary portion between the two regions forms a stepped portion on the external surface of the body portion.

Glass funnel and glass bulb for cathode ray tube

A body portion of the funnel, within a range excluding corners, has a first region of predetermined dimension, the predetermined dimension being measured from the seal edge surface in a direction parallel to a tube axis, and a second region excluding the first region. The second region has a thickness relatively smaller than the thickness of the first region, so that a boundary portion between the two regions forms a stepped portion on the external surface of the body portion.

Glass funnel for cathode-ray tube and glass bulb for cathode-ray tube

The reference surface of the positioning reference on the funnel is formed as a flat plane from a mold match line towards a small-diameter opening side. In addition, the reference surface of the positioning reference is formed in parallel with or in a direction near a central axis line of the funnel from the mold match line towards the small-diameter opening side with respect to a plane which is in parallel with the central axis line and includes the mold match line.

Funnel for cathode ray tube and mold for making the same

A funnel for a cathode ray tube has a relationship 0&#x3c;&#x3b1;(z)&#x3c;d in an arbitrary cross section P(z) parallel with a plane including an open end portion, where &#x3b1;(z) is an angle (&#xb0;) defined between a line and a major axis (LA) of the funnel, the line being connecting an outermost part D(z) on at least one of an outer surface and an inner surface of the body portion and a center axis (C) of the funnel, and d is an angle (&#xb0;) defined between a diagonal axis (DA) of the funnel and the major axis (LA).

Funnel for cathode ray tube

A diagonal inner-face curved portion is formed on an inner face of a diagonal portion of a pyramid-shaped yoke portion. The diagonal inner-face curved portion is formed to make at least one of partially inner-face curved portions at the major axis side and the minor axis side of the diagonal axis swell to the outward side. The partially inner-face curved portions at the major axis side and the minor axis side are formed by circular arced portions with different radii to each other.

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Otsu, Japan

Hiroshi Kakigi