Faceplate bonding process for a visual display unit

Details Faceplate bonding process for a visual display unit Faceplate bonding process for a visual display unit

1994-06-20

1995-05-23

Ball, Michael W.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156107, 1562753, B32B 1706

Patent

active

054177910

ABSTRACT:
A method of bonding faceplates (20) to VDU screens is provided in which an adhesive material is dispensed (80) onto a surface of either the faceplate or the VDU (40), the faceplate and the VDU are brought together (90) to force the adhesive material outwards to fill the gap between the surfaces, and the adhesive material layer (41) which is formed is then cured. In a first curing step (100), curing is carried out around the edges of the faceplate to form a seal around the edges. This first step may be carried out in a dedicated positioning tool. A later curing step (120) ensures that all of the adhesive material layer is eventually cured. Positioning (90) in the dedicated tool may use specific reference points on the faceplate and the VDU rather than relying on physical spacers, and may be carried out under servo control of a system for detecting the onset of undesirable gas entrapment conditions within the adhesive layer. The invention is particularly useful for automated or semi-automated bonding of touch-plates to screens to form touch-input displays, with the avoidance of spacers and with the selective, two-stage curing enabling minimising of time in the positioning tool.

REFERENCES:
patent: 3075870 (1963-01-01), Hedler et al.
patent: 3305123 (1967-02-01), Nordby

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