Projection cathode ray tube having tapered shaft screw target as

Details Projection cathode ray tube having tapered shaft screw target as Projection cathode ray tube having tapered shaft screw target as

1995-02-21

1997-04-08

O'Shea, Sandra L.

Electric lamp and discharge devices

Cathode ray tube

Envelope

313478, H04N 574

Patent

active

056190956

ABSTRACT:
A projection cathode ray tube having an improved target assembly (22) for minimizing target tilt and hot focus drift is disclosed. The target member (24) is supported by a shaft screw (37) secured to a face plate (20) of the projection tube by an adjustment pad (58) external to the tube in cooperation with a biasing spring (46) internal to the tube that exerts a tensile load on the shaft screw (37). A shaft screw tapered shoulder (36) and threaded mounting stud (34) engage a tapered seat (32) and threaded mounting bore (30) of the target (24), with the taper angle (.theta.) common to the shoulder and seat calculated to maintain constant contact between the abutting surfaces of the shoulder (36) and the seat (32) during thermal expansion and contraction of the target member (24) and shaft screw (37).

REFERENCES:
patent: 4034398 (1977-07-01), Sheldrake et al.
patent: 4177400 (1979-12-01), Hergenrother et al.
patent: 5159230 (1992-10-01), Pais
patent: 5204751 (1993-04-01), Salyer et al.

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