Nippon Kayaku Kabushiki Kaisha

Shigeru Maeda

Hirotaka Mukunoki

Hideyuki Koike

Toshiaki Furuya

Yasuaki Matsumura

Yoshihiro Koshido

Hajime Yamada

Dairi Kubo

Atsushi Ishida

Shigeo Hayashimoto

Naoko Aizawa

Ryoi Kodama

Toshiyuki Suzuki

Makoto Iwasaki

Masahiro Yoshida

Katsuki Nakanishi

Hiroki Taguchi

Kenichirou Yamashita

Masahiro Kato

Eiji Komatsu

Toshio Matsuura

Mikio Ogawa

Norikazu Yoshida

A gas generator includes a holder made of metal having assembled thereto a cup filled with a gas generating agent and an igniter for burning the gas generating agent. The holder includes a body part, and an igniter fixing engagement part and a cup fixing engagement part projecting from the body part. These engagement parts are bent, so that the igniter and the cup are fixed by crimping to the holder. The engagement parts are both finish shaped by forging processing. A metal flow appearing in superficial layers of the engagement parts extends continuously from the body part through the engagement parts to return to the body part, without being divided in surfaces of the engagement parts.

Gas generator, gas generator holder and method for manufacturing gas generator holder

There is provided an ignition system which is capable of surely operating by electric energy stored in a capacitor for ignition while separating an igniter from electric circuits for communication and ignition without producing improper operation through static electricity and noise and is compact and excellent in the productivity.

Ignition system, gas generating device for airbag, and gas generating device for seatbelt pretensioner

The invention provides a semiconductor bridge, an igniter, and a gas generator each of which satisfies a high-speed responsiveness required of, for example, an automotive side inflator. The semiconductor bridge includes a bridge part heated by being supplied with a current. The bridge part is disposed on a substrate. The bridge part includes a first layer and an ignition bridge layer. The first layer is formed on the substrate and has insulating properties. The ignition bridge layer serves as a second layer disposed on the first layer. The width of the bridge part at the first layer and the width of the bridge part at the second layer are substantially equal to each other. A space is provided around the bridge part. With this structure, the diffusion of current and heat into the substrate can be restricted to the minimum level, and the ignition time can be quickened as an ignition characteristic. Each of the igniter and the gas generator includes the semiconductor bridge.

Semiconductor bridge, igniter, and gas generator

A header assembly includes a header holding a plurality of electrode pins to be insulated from one another, an ignition element mounting capacitor having at the center of its outer circumferential surfaces external terminal electrodes for electrically connecting to an ignition element mounted on the capacitor, an IC having first, second, and third electrode pads to be electrically connected to end electrodes of the ignition element mounting capacitor and the external terminal electrodes and further having connection electrodes to be electrically connected to the electrode pins of the header for communication with the external. The IC is located on the header, and the ignition element mounting capacitor is located on the IC and electrically connected to the electrode pins through the connection electrodes provided on the IC. The invention provides a squib enabling a size to be minimal and quality to be improved, while maintaining high productivity, and hence provides the header assembly and the ignition element mounting capacitor as components of the squib, and further a gas generator with the squib installed therein for an air bag, and a gas generator having the squib installed therein for a seat belt pretensioner.

Header assembly, squib and gas generator for air bag and gas generator for seat belt pretensioner

An ignition element mounting capacitor having an ignition element mounted on a capacitor, includes therein a first capacitor section and a second capacitor section, and first external terminal electrodes electrically connected to the first capacitor section and second external terminal electrodes electrically connected to the second capacitor section. The first capacitor section has a capacity for igniting ignition powder, and the second capacitor section has a function for removing noise which affects external circuits. Further, provided on the surface of the capacitor are third external terminal electrodes electrically connected to the ignition element. In this manner, the invention provides a squib enabling its size to be miniaturized and its quality to be improved, while keeping a high productivity, and hence provides a header assembly and a ignition element mounting capacitor as components of the squib and further provides a gas generator having such a squib installed therein for an air bag and a gas generator having the squib for a seat belt pretensioner.

Ignition element mounting capacitor, header assembly, squib and gas generator for air bag and gas generator for seat belt pretensioner

A squib includes a cup body and a closure plug for holding a plurality of electrode pins insulated from one another and closing the opening of the cup body, and further includes, in the cup body, ignition powder and an ASIC component formed by molding a resin around electric circuits including an ASIC and a capacitor, a heating element connected to the ASIC and located at the top of the resin molding of the ASIC component, and connection electrodes located at the bottom of the resin molding for connecting the ASIC to the electrode pins. The squib includes a cylindrical metal fixture having at the center of its top an opening of a size sufficient to expose the heating element and being fixed to the closure plug in a state covering the top circumferential periphery and side surface of the ASIC component and pushing the connection electrode of the ASIC component against the electrode pins. With the squib thus constructed, electric current can be reliably supplied to the electric circuits incorporated in the squib, and upon operation of the squib the resin molding and its broken pieces are effectively prevented from flying in all directions.

Squib, gas generator for air bag and gas generator for seat belt pretensioner

A squib includes an SCB chip connected to electrode pins so as to ignite by externally applied electric current, and a capacitor electrically connected to the electrode pins in parallel with a thin film resistor on the SCB chip. The capacitor is arranged above the header, and the SCB chip is directly mounted on the capacitor so that the thin film resistor on the SCB chip and the capacitor are electrically connected through electrodes provided on a substrate of the SCB chip, while the size of the SCB chip is smaller than that of the capacitor. In this way, the invention provides the squib which effectively eliminates surface unevenness when the capacitor is located, and enables the connection of the SCB chip and the capacitor to the electrode pins only by one reflow process, and further makes it possible to use an even smaller chip than those used in the prior art.

Squib and gas generator

There is provided a semiconductor bridge device wherein a reaction time for generating sparks is short and a spark generating amount is large. This semiconductor bridge device comprises a substrate, a pair of land portions, a bridge portion electrically connecting between the pair of the land portions, and an electrode pad arranged on each upper surface in the pair of the land portions and emitting sparks at the bridge portion through an electric current passed between the electrode pads, in which the pair of the land portions and the bridge portion consist of a laminate formed by alternately laminating a metal layer and a metal oxide layer plural times, and an outermost layer in the laminate is a metal layer, and a metal oxide having a decomposition temperature of higher than 1500&#xb0; C. is used in the metal oxide layer.

Semiconductor bridge device and igniter including semiconductor bridge circuit device

A gas generator including a plug () having a header part () and two or more electrode pins (), a thin-film bridge () having electrode pads (), and a squib () in which upon supply of electric current to the thin-film bridge () via the electrode pins (), the thin-film bridge () is activated to ignite ignition materials (), wherein the thin-film bridge () is arranged into a hollow () prepared at the plug () in such a manner that the thin-film bridge () is kept approximately on a level with the head () of the electrode pins () and the header part () of the plug (), the thin-film bridge () is connected by wire bonding to the electrode pins () at the electrode pad parts (), and at least either of the electrode pad () or () of the thin-film bridge () is connected by the wire bonding to a metal part of the header part () of the plug ().

Growing community of inventors

Himeji, Japan

Shigeru Maeda