Safety device of electric circuit and process for producing the same
First Claim
1. A safety device of an electric circuit comprising:
- first protective means in an overcurrent protector for protecting the electric circuit from an overcurrent, which generates heat to increase its electrical resistance when an overcurrent flows in the electric circuit, whereby reducing or cutting off the overcurrent; and
second protective means including a thermal fuse situated in the vicinity of the overcurrent protector comprising;
a first electrode having a first conductor pattern connected to the overcurrent protector;
a second electrode having a second conductor pattern insulated from the first electrode by a gap; and
solder connecting the first and second electrodes and melting by heat from the overcurrent protector so as to split into two parts toward the first and second electrodes, wherein the second conductor pattern for forming the thermal fuse is formed on one side of the circuit board and connected to the second electrode having an island shape formed on an opposite side of the circuit board through a through-hole, the first electrode continuously surrounds the second electrode with a gap between the first and second electrodes on the opposite side of the circuit board, and solder connects the first and second electrodes.
1 Assignment
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Accused Products
Abstract
A safety device of an electric circuit is provided, in which a thermal fuse securely prevents an accident from occurring when an overcurrent protector is extraordinarily overheated. The safety device includes: first protective means in an overcurrent protector for protecting the electric circuit from an overcurrent, which generates heat to increase its electrical resistance when an overcurrent flows in the electric circuit, whereby reducing or cutting off the overcurrent; and second protective means including a thermal fuse situated in the vicinity of the overcurrent protector containing: a first electrode having a first conductor pattern connected to the overcurrent protector; a second electrode having a second conductor pattern insulated from the first electrode by a gap; and solder connecting the first and second electrodes and melting by heat from the overcurrent protector so as to split into two parts toward the first and second electrodes. According to the safety device, the thermal fuse can quickly operate when the overcurrent protector is extraordinarily overheated and be easily formed by employing an automatic soldering machine and the like.
47 Citations
15 Claims
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1. A safety device of an electric circuit comprising:
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first protective means in an overcurrent protector for protecting the electric circuit from an overcurrent, which generates heat to increase its electrical resistance when an overcurrent flows in the electric circuit, whereby reducing or cutting off the overcurrent; and
second protective means including a thermal fuse situated in the vicinity of the overcurrent protector comprising;
a first electrode having a first conductor pattern connected to the overcurrent protector;
a second electrode having a second conductor pattern insulated from the first electrode by a gap; and
solder connecting the first and second electrodes and melting by heat from the overcurrent protector so as to split into two parts toward the first and second electrodes, wherein the second conductor pattern for forming the thermal fuse is formed on one side of the circuit board and connected to the second electrode having an island shape formed on an opposite side of the circuit board through a through-hole, the first electrode continuously surrounds the second electrode with a gap between the first and second electrodes on the opposite side of the circuit board, and solder connects the first and second electrodes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification