Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1995-02-06
1996-01-02
Valentine, Donald R.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
20412965, 20412975, 204224M, 204275, C25F 302, C25F 700
Patent
active
054805198
ABSTRACT:
A method and apparatus for forming lead frames and eliminating irregularities in the edge (22) of openings etched in the sheet metal from which the lead frame is formed. In a first process, a photo resist coated metal sheet (36) is first etched by a photo chemical process to define the lead frame, and then the lead frame metal sheet (36) is etched in an electrochemical process to remove edge irregularities. In a second process, the entire lead frame is formed in an electrochemical process.
REFERENCES:
patent: 4294680 (1981-10-01), Lincoln et al.
patent: 5167794 (1992-12-01), Ito
patent: 5284554 (1994-02-01), Datta et al.
Abbott Donald C.
Dainis, III George A.
West David W.
Brady III W. James
Donaldson Richard L.
Texas Instruments Incorporated
Valentine Donald R.
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