The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 28, 2003
Filed:
Feb. 28, 2001
Takaharu Okubo, Ishikawa, JP;
Takashi Ishikawa, Ishikawa, JP;
Hiroyuki Fujita, Ishikawa, JP;
Shoji Horie, Ishikawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
The impedance of a newly manufactured data transmission wire pattern can be measured easily and accurately. A multilayer type printed-wiring board comprises a pair of data transmission wire patterns arranged between a CPU module and a memory module on respective inner layer substrates impedance measuring wire patterns and arranged respectively in the layers same as those of the data transmission wire patterns , a prepreg layer arranged on the impedance measuring wire patterns , land sections for signals arranged on the prepreg layer and electrically connected to the impedance measuring wire patterns so as to be brought into contact with the signal terminal of a probe and a GND land section also arranged on the prepreg layer and electrically connected to the impedance measuring wire patterns so as to be brought into contact with the GND terminal of the probe , the impedance measuring wire patterns having a pattern length not smaller than 30 mm that is the minimal length required for use with a TDR unit and a pattern width same as that of the data transmission wire patterns