Electric lamp and discharge devices: systems – Cathode ray tube circuits – Combined cathode ray tube and circuit element structure
Patent
1988-03-31
1990-03-20
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Combined cathode ray tube and circuit element structure
315 32, 315112, 361399, 313 11, 312 72, H01J 2316, H01J 2996, H05K 504, A47B 500
Patent
active
049104349
ABSTRACT:
An enclosure for a video-amplifier printed wiring board (PWB) located in close proximity to, and substantially structurally separated from the cathode ray tube (CRT) connector base in a video display terminal (VDT). The enclosure combines the functions of a structural support for the board on the VDT chassis, of an EMI/RFI shield for the board, and of an expanded heat transfer-surface heatsink. The enclosure comprises a one-piece casting with a cavity formed by a bottom wall, side walls adjacent to the bottom wall, and an open side opposite to the bottom wall. It further has integral mounting features to locate and structurally support the board in the cavity with the high heat-dissipation components facing the inner surface of the cavity's bottom wall. The outer surface of the bottom wall is provided with integral, heat-dissipating fins to form an expanded heat-transfer surface heatsink. The bottom wall has a substantially circular opening through which the CRT connector base protrudes into close proximity with the video board, being connected thereto by flexible electrical wires transmitting substantially no mechanical load to the CRT base. The cavity is covered at the open side with an electrically conductive cover to complete the EMI/RFI shield around the video board, the cover preferably being part of the VDT chassis, thus also providing structural support to the enclosure.
REFERENCES:
patent: 3944892 (1976-03-01), Johnson et al.
patent: 4400645 (1983-08-01), Simouits, Jr. et al.
patent: 4677344 (1987-06-01), Toshiyasu et al.
patent: 4716493 (1987-12-01), Zelkowitz
Doumani George A.
Samarov Victor M.
Digital Equipment Corporation
LaRoche Eugene R.
Shingleton Michael B.
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