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    • 3. 发明专利
    • Improvements in or relating to the manufacture of dry rectifiers
    • GB612858A
    • 1948-11-18
    • GB1661946
    • 1946-05-31
    • STANDARD TELEPHONES CABLES LTDCEDRIC LIPTON COOPERLESLIE JAMES ELLISON
    • H01L21/06
    • 612,858. Asymmetrically-conducting resistances. STANDARD TELEPHONES & CABLES, Ltd., COOPER, C. L., and ELLISON, L. J. , May 31, 1946, No. 16619. [Class 37] A method of manufacturing metal rectifier elements comprises simultaneously applying insulating washers to the surrounds of mounting holes in a coated base-plate or strip. The coated base-plate, suitably masked by paper, has first punched in it the mounting holes for a number of rectifier elements, the mask then being removed. The insulating paper washers and a second mask are then applied, the washers 34 being stacked on rods 33 carried on a plate 32 which is normally forced by springs 29a against the underside of a fixed plate 31a, through which the rods 33 pass.- A vacuum pick-up 31 is lowered by means of a handle 53 and pulley 49, blind holes 45 engaging the tops of rods 33 and pushing them down till plate 44 of the pick-up contacts the top washer on each stack. The pick-up is then' raised, and a slidable plate 27 carrying the coated base-plate, suitably punched and masked, is moved under the pick-up 31 which is lowered and operated by lever 41 to release the washers. The pickup is then raised a second time, the plate 27 moved under a hot press tool which tacks the mask and washers in position. The counterelectrode is then applied and the separate discs punched from the plate. Specifications 526,482 and 561,872 are referred to.