| 摘要 |
A process for making an envelope for a projection televised tube, that includes a spherically curved electronic beam target surface spaced away from the neck of the tube, a larger reflective surface spherically curved concentrically with the target surface on an end plate located close to the tube neck, a target support that preferably constitutes a face plate for the envelope, and a hollow cylindrical spacer member for closing the side of the tube envelope and for holding the target support accurately spaced from the reflective surface, includes making the ends of the cylindrical member and the abutting peripheral surfaces of the end plate and target concentric with the target and reflective surfaces, so that slight relative lateral motion of the parts during assembly and bonding will not affect tube projection optics, while the relationship between the target and reflective surfaces is precisely maintained in spaced concentric relationship.
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