Printed-circuit board with fuse

Abstract

A printed wiring board includes a substrate ( 20 ) on which a wiring pattern ( 12 ) has been formed, and a fuse ( 6 ) provided on the substrate ( 20 ). One end of the fuse ( 6 ) is directly connected to a first pad ( 12 a ) of the wiring pattern ( 12 ), and the other end of the fuse ( 6 ) is directly connected to a second pad ( 12 b ) of the wiring pattern ( 12 ). The fuse ( 6 ) is covered by a protective material ( 7 ).

1 . A printed wiring board, comprising: 
 an insulating substrate on which a wiring pattern has been formed; and    a fuse including circuit breaking means,    the circuit breaking means being directly connected to the wiring pattern.    
     
     
         2 . The printed wiring board according to  claim 1 , wherein the wiring pattern includes two conductor pads that are apart from each other, and the circuit breaking means bridges the two conductor pads.  
     
     
         3 . The printed wiring board according to  claim 1 , wherein the circuit breaking means is covered with a protective material.  
     
     
         4 . The printed wiring board according to  claim 1 , further comprising at least one electronic part mounted on the substrate, and the circuit breaking means being disposed lower than the electronic part.  
     
     
         5 . The printed wiring board according to  claim 1 , wherein the circuit breaking means is a solder wire.  
     
     
         6 . The printed wiring board according to  claim 1 , further comprising heat insulating means disposed in the vicinity of the circuit breaking means.  
     
     
         7 . The printed wiring board according to  claim 1 , wherein the circuit breaking means is formed integrally with the wiring pattern.  
     
     
         8 . The printed wiring board according to  claim 7 , wherein the circuit breaking means is a relatively narrow portion of the wiring pattern.  
     
     
         9 . The printed wiring board according to  claim 8 , wherein the wiring pattern is composed of copper.  
     
     
         10 . The printed wiring board according to  claim 6 , further comprising a resist layer that covers the wiring pattern, and the heat insulating means including an opening formed in the resist layer.  
     
     
         11 . The printed wiring board according to  claim 6 , wherein the heat insulating means is a through hole provided to the substrate.  
     
     
         12 . The printed wiring board according to  claim 11 , wherein the circuit breaking means bridges the through hole.  
     
     
         13 . The printed wiring board according to  claim 11 , wherein the circuit breaking means is provided inside the through hole.  
     
     
         14 . The printed wiring board according to  claim 6 , the heat insulating means being a recess provided to the substrate.  
     
     
         15 . The printed wiring board according to  claim 14 , wherein the circuit breaking means bridges the recess.  
     
     
         16 . The printed wiring board according to  claim 6 , further comprising an additional insulating substrate, and the heat insulating means including a through hole formed in the additional insulating substrate.  
     
     
         17 . The printed wiring board according to  claim 6 , further comprising an additional insulating substrate, and the heat insulating means including a recess formed in the additional insulating substrate.