Printed circuit board

Details Printed circuit board Printed circuit board

2007-10-16

2007-10-16

Norris, Jeremy C (Department: 2841)

Electricity: conductors and insulators

Conduits, cables or conductors

Preformed panel circuit arrangement

C174S262000, C439S060000

Reexamination Certificate

active

10685605

ABSTRACT:
On the surface of a back board outermost-layer signal lines have different lengths. A difference in lengths of connector lines connected to the outermost-layer signal lines makes the total signal line lengths substantially equal. A digital signal generated in the circuit of a daughter board reaches a through hole through an internal-layer signal line traced within the internal layer of the daughter board, and is further transmitted to an internal-layer signal line of the back board through the a connector line, the an outermost-layer signal line, and a through hole. The digital signal is further transmitted to another internal-layer signal line via another through hole, another connector line, and another through hole.

REFERENCES:
patent: 4621880 (1986-11-01), Rush
patent: 4904968 (1990-02-01), Theus
patent: 4992052 (1991-02-01), Verhoeven
patent: 5516297 (1996-05-01), Atoh et al.
patent: 5522727 (1996-06-01), Saito et al.
patent: 6072699 (2000-06-01), Horine
patent: 6464540 (2002-10-01), Sato
patent: 2001-022486 (2001-01-01), None

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