US 4,308,484 AGranted

Frontplate and shadow mask assemblies for a modular flat panel display device

AssigneeRCA Corporation

InventorsCharles B. Carroll, Robert E. Schneller

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Abstract

A faceplate assembly for a display device is composed of a shadow mask assembly and a frontplate assembly both of which can be individually assembled. The shadow mask assembly is composed of a plurality of vane tips positioned between a plurality of channel shaped shadow mask sections. Tie rods pass through the tips and tip spacers to hold the members together in a single assembly. The spacers are positioned inside the tip walls to control the transverse dimension of the shadow mask assembly. The frontplate assembly includes location blocks which are affixed to the frontplate in the proximity of the corners of the frontplate. Location notches are precisely located on the frontplate and the precise positions of the location blocks with respect to the location notches recorded. A shadow mask assembly and a frontplate assembly are mated and the shadow mask assembly precisely positioned by inserting shims of the required thicknesses between the location blocks and the mask assembly.

Claims12

Dependent claims

In a flat panel display device having an evacuated envelope with an individually assembled frontplate assembly and an individually assembled shadow mask assembly, an improvement comprising:

said shadow mask assembly including a plurality of channel shaped shadow mask sections, said mask sections including locking means;
a plurality of vane tips, including means for receiving at least one tie rod and including means for receiving said locking means;
a plurality of vane tip spacers configured to receive a tie rod;
at least one tie rod alternately receiving said vane tips and said vane tip spacers so that vane tip spacers are positioned between said vane tips and beneath said shadow mask sections;
means for retaining said vane tips on said tie rod;
said frontplate assembly including a frontplate having at least one precisely positioned locating notch;
a plurality of locating blocks affixed to the internal surface of said frontplate so that the precise position of said locating blocks with reference to said locating notches is known;
a plurality of clamp means for receiving said means for retaining and coupling said shadow mask assembly to said locating blocks.

5 more elements

Dependencies are inferred from the claim text.