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By George R. Dallimore (auth.), Lawrence L. Rosine (eds.)

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Read or Download Advances in Electronic Circuit Packaging: Volume 5 Proceedings of the Fifth International Electronic Circuit Packaging Symposium sponsored by the University of Colorado, EDN (Electrical Design News), and Design News, held at Boulder, Colorado, August 19–2 PDF

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Extra resources for Advances in Electronic Circuit Packaging: Volume 5 Proceedings of the Fifth International Electronic Circuit Packaging Symposium sponsored by the University of Colorado, EDN (Electrical Design News), and Design News, held at Boulder, Colorado, August 19–2

Sample text

By making these changes prior to documentation release the high costs of formal documentation change are eliminated. The decisions required early in the project to assure a producible end item are graphically depicted in Figs. 1 and 2. 58 59 Producibility Norms for Electronic System Packsging I ~ I~ Safety Factor I I I I I OOLLAR COST OF FUNCTION Limit at which sys tunettonal requirements can be met Ideal engineertng package. Maxtmum thermal, electncal & mechantcal performance Ideal mfg package Hin tooling, equtp & Operator sktll & labor.

Packaging Concept for a Miniature Low-Light-Level TV Camera •• V •• 20 II 10 14 '' BASIC CONDITIONS: I ROOM TEMPlERATURE - zo•c CYUNDRICAL FIN ON TUBE BULB '\. LEGEND: • • \. - ........... \. '\ t---.. , CATHOOE: HIEATt:R POWER •ltl _ HIEAT TRANSFER 8Y NATURAL CONVtCTICIN A RADIATION • ----.. 096 1n. QS2 111· WAU. ONG TUBE l•racllell Fig. 17. Temperature rise vs. distance along image orthicon tube. ENVIRONMENTAL CONSIDERATIONS The operating camera control box was environmentally tested to the following specifications without the benefit of conformal coating or potting: High temperature operating, 120•F for 3 hr; humidity, 95% RH, so•F for 3 hr; altitude, 30,000 ft, so•F, 50% RH for 3 hr; cold, -3Q•F for 3 hr; vibration,* 20-2000 cps ± 1 g, resonance search (transmissibi1ity was less than eight on all major components except the H and V sweep, which went as high as eighteen in an area of about the center of the card).

Handle and base are arbitrary, and were selected for camera demonstration purposes. 4. Aluminum fin-although present design dictates a maximum temperature differential of 5°C across the tube envelope, some systems requirements would preclude this requirement as on short-lived missions. In addition, future tube design is expected to advance to the point where the cathode-heater output is reduced, and the cesium migration phenomenon mimimized. 5. The camera head cable is also excluded since it again would depend on the system requirements.

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