Gas generator

Abstract

A gas generator has a closing plug (24) having a header section (45) and two or more electrode pins (22, 23), a thin film bridge (25) having electrode pads (41, 42), and an igniter (10) for igniting ignition agents (26, 27) when an electric current is supplied to the thin film bridge (25) through the electric pins (22, 23) to operate the thin film bridge (25). The thin film bridge (25) is embedded in a recess (32) provided in the closing plug (24) so as to be flush with a head section (35) of the electrode pins (22, 23) and the header section (45) of the closing plug (24). The thin film bridge (25) is connected by wire-bonding at the electrode pads (41, 42) to the electrode pins (22, 23), and at least one of the electrode pads (41, 42) of the thin film bridge (25) is connected by wire-bonding to a metal section of the header section (45) of the closing plug (24).

Description

technical field [0001] The present invention relates to a gas generator suitable for inflating side airbags, curtain airbags, and the like. Background technique [0002] An airbag is known as one of safety devices for protecting occupants from the impact of a car collision. The airbag operates by generating a large amount of high-temperature and high-pressure gas from the gas generator. Conventionally, as a method for causing the gas generator to generate gas, roughly divided into two types are known. One is a thermal method in which a solid gas generating agent is combusted to generate all generated gas (for example, refer to Patent Document 1). There is also a hybrid method in which a large amount of high-pressure gas is released by means of a high-pressure gas cylinder holding high-pressure gas and a small amount of propellant composition for supplying heat to the high-pressure gas in the high-pressure gas cylinder (for example, refer to Patent Document 4). [0003] Fu...

AI Technical Summary

Problems solved by technology

However, in the case of bonding with a conductive epoxy resin, when used as an igniter such as a gas generator of a car, it may be exposed to high temperature environments such as hot summer weather and may conduct electricity. The resistance value of the permanent epoxy resin changes

In addition, since the resistance value is easily affected by the state of the electrode surface even at the beginning of assembly, there is a problem that the initial resistance value varies greatly

In addition, in the case of wire bonding, although the problem of solder and conductive epoxy resin can be eliminated, in the case shown in Patent Document 6, since the thin film bridge is fixed in a state protruding from the plug, the filling When the plug with protruding membrane bridge is inserted into the cap containing the igniting powder, there is a risk of breaking the lead wire under the action of a squeezing force

In particular, as described in Patent Document 6, when the lead wire is erected and joined to the end surface, that is, so-called vertical mounting, the risk is significant.

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