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    MANUFACTURE OF PRINTED CIRCUITS
    3.
    发明专利
    MANUFACTURE OF PRINTED CIRCUITS 未知

    公开(公告)号：GB1261108A

    公开(公告)日：1972-01-19

    申请号：GB1345569

    申请日：1969-03-14

    Applicant: IBM

    Inventor： GIEDD GARY ROBERT ,  PERKINS MERLYN HAROLD

    IPC: H05K3/00 ,  H05K3/12

    Abstract: 1,261,108. Controlling continuous furnaces. INTERNATIONAL BUSINESS MACHINES CORP. 14 March, 1969 [15 March, 1968], No. 13455/69. Heading F4B. [Also in Divisions B6, G2-G3 and H1] An automated apparatus, Fig. 1, for fabricating multi-layer ceramic modules is controlled by a process computer 2 through an output line 20. Wire mesh masks are coated with a photo-sensitized epoxy material in a screen preparation unit 16 and fed to a printed circuit exposure inspection tool 14 wherein the coated screen is exposed in a pattern determined by the computer. The exposed screen is then inspected and fed to a developing unit 18 after which it is inspected in tool 14 and passed to a printing unit 8. The developed screen is positioned on a ceramic green sheet, from a punch unit 6, and a conductive printed pattern deposited by a silk-screen printing process. After a further inspection in the tool 14 the modules are stacked in a unit 10 and fired in a heating unit 12 from which they are delivered as multi-layer ceramic modules. Heating unit, Fig. 8. A plurality of stacked modules are transferred, by belts 148, (1) through an entrance gate 152 into a first oven zone 153 which is preconditioned by heating coils 154 to provide a desired temperature profile, (2) through a gate 155 to a constant temperature firing zone 15, (3) through a gate 157 to a cooling zone 158 and finally exited at a gate 160. The heating coils 154 of the zones are controlled in response to thermocouples 159 and the operating conditions monitored by the computer.

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