Importance

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Abstract

A focus coil (20) is adjustably retained around the neck (12c) of a cathode ray tube (12) inside a shield (14). An alignment apparatus (62) includes a ring (64) which is movable with five degrees of freedom and clamps onto the coil (20) through holes (14j) formed through the shield (14). The tube (12) and shield (14) are held stationary, while the ring (64) and thereby the coil (20) are moved to align the coil (20) relative to the tube (12) in accordance with electrical alignment test signals applied to the tube (12). A clam shell (66) which is generally coaxially disposed between the shield (14) and ring (64) includes a plurality of arcuate segments (66a) which are hinged together at their ends, and have pins (66b) extending radially inwardly therefrom for clamping engagement with the coil (20). A screw (70) extends inwardly from the ring (64) to clamp the clam shell (66) between its inner end and a radially opposed portion (72) of the inner surface of the ring (64). A sleeve (40) removably fixes the coil (20) to the neck (12c) of the tube (12), and includes a plurality of resilient fingers (56) which are movable into and out of locking engagement with the neck (12c). The sleeve (40) is clamped to the neck (12c) and, after alignment of the coil (20) to the tube (12), the coil (20) is fixed to the sleeve (40) using an adhesive.

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First Claim