一、概述 757向量计算机是一台每秒运算1000万次的大型通用计算机,该机对印刷线路板提出的要求是高电性能、高密度和高可靠性。以往采用的小板面多层板作插件、用双扭线作底板互联和用工艺导线法进行印制板生产已不能胜任,必须采用新的板型及新工艺。经过分析、试制设计出757机用多层印制板板型和生产新工艺。它具有以下几个特点;(1)用带有双72线印制插头大面 I. Overview 757 vector computer is a computing 10 million times per second, large general-purpose computer, the aircraft on the printed circuit board made of the requirements of high electrical performance, high density and high reliability. The past use of small board for the plug-in board, with twisted pair for the floor interconnection and the use of technology lead method of PCB production has been competent, we must use the new plate and the new technology. After analysis, trial design of the 757 machine with multi-layer PCB board type and production of new technology. It has the following characteristics; (1) with a large print with a double 72-line plug