Metal working – Method of mechanical manufacture – Electrical device making
Reexamination Certificate
2009-01-20
2011-10-25
Phan, Thiem (Department: 3729)
Metal working
Method of mechanical manufacture
Electrical device making
C029S610100, C029S829000, C029S844000, C438S112000, C438S126000, C438S382000, C438S754000, C438S778000
Reexamination Certificate
active
08042261
ABSTRACT:
A method for fabricating the embedded thin film resistors of a printed circuit board is provided. The embedded thin film resistors are formed using a resistor layer built in the printed circuit board. In comparison with conventional discrete resistors, embedded thin film resistors contribute to a smaller printed circuit board as the space for installing conventional resistors is saved, and better signal transmission speed and quality as the parasitic capacitive reactance effect caused by two contact ends of the conventional resistors is also avoided. The method for fabricating the embedded thin film resistors provided by the invention can be conducted using the process and equipment for conventional printed circuit boards and thereby saving the investment on new types of equipment. The method can be applied in the mass production of printed circuit boards and thereby reduce the manufacturing cost significantly.
REFERENCES:
patent: 6281090 (2001-08-01), Kukanskis et al.
patent: 7213327 (2007-05-01), Su et al.
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