Abstract: A gas generator comprising, a first ignition device, a first inner tube member including therein the first ignition device and a surrounding wall portion provided with one or a plurality of communication holes, the surrounding wall portion including, in a circumferential direction thereof, a combustion product discharge region and a combustion product non-discharge region, and a housing including a peripheral wall portion and defining therein a first combustion chamber, the peripheral wall portion being provided with a first gas discharge port and a second gas discharge port having an opening pressure higher than the first gas discharge port, and a communication hole-associated region associated with the combustion product discharge region and including only the first gas discharge port formed therein and a communication hole non-associated region associated with the combustion product non-discharge region and including the second gas discharge port formed therein.

Abstract: A gas generator includes a housing, a combustion chamber accommodating therein a gas generating agent burned by an ignition device, a plurality of gas discharge ports provided to a wall surface that defines the combustion chamber, and communicating an inside and an outside of the combustion chamber, and a plurality of closing members respectively closing the plurality of gas discharge ports. Each of the plurality of closing members includes a covering region covering a corresponding gas discharge port of the plurality of gas discharge ports, and a joining region being joined to the wall surface of the housing, and formed adjacent to and surrounding the covering region. The joining region of each of the plurality of closing members is joined to the wall surface at a width within a range from 1 mm to 5 mm, inclusive, from a peripheral edge of the corresponding gas discharge port, and without interfering with another joining region.

Abstract: A gas generator includes: an ignition device chamber arranged at one end opening of a housing; a diffuser portion provided with a gas discharge port and arranged at another end opening; a pressurized gas chamber arranged between the ignition device chamber and the diffuser portion; a first rupturable plate closing the one end opening between the ignition device chamber and the chamber; a second rupturable plate closing the other end opening between the chamber and the diffuser portion; an igniter and a molded article of a gas generating agent accommodated in the ignition device chamber; a gas charged in the chamber; and an amount A (J/msec) of energy generated per unit time by the gas generating agent, a cross-sectional area B (cm2) of the chamber at a portion proximate to the ignition device chamber, and a density C (g/cm3) of the gas satisfy A/B×C=320 to 490.

Abstract: The present invention provides an igniter assembly in which reliability in operation is enhanced. An igniter assembly includes an igniter main body, a resin portion enclosing a periphery of the igniter main body, a metallic collar being arranged on a periphery of the resin portion and integrated with the resin portion, a cup-like shaped igniter housing filled therein with a gas generating agent or a transfer charge. The metallic collar includes a combination of a cylindrical collar and an annular collar, and the cup-like shaped igniter housing abuts against a portion with a reduced diameter on the side of a first end portion of the cylindrical collar, thereby being fixed from the outside.

Abstract: The present invention provides a gas generator, including: an ignition device chamber arranged at a first end opening of a cylindrical housing; a diffuser portion provided with a gas discharge port and arranged at a second end opening opposite to the first end opening in a longitudinal axial direction of the cylindrical housing; a pressurized gas chamber arranged between the ignition device chamber and the diffuser portion; a first rupturable plate closing the first end opening between the ignition device chamber and the pressurized gas chamber; a second rupturable plate closing the second end opening between the pressurized gas chamber and the diffuser portion; an igniter and a molded article of a gas generating agent being accommodated in the ignition device chamber; a gas which serves as a gas source being charged in the pressurized gas chamber under a high pressure; and an amount A (J/msec) of energy generated per unit time from the molded article of the gas generating agent charged in the ignition dev

Abstract: The present invention provides a gas generator in which short-passing of combustion gas is prevented. A cylindrical filter 30 including a first annular end surface 32 abutted against a top plate 12 and a second annular end surface 33 abutted against a bottom plate 21 is disposed inside a housing 10. A corner portion 75 formed by a bottom surface 71 and an outer circumferential wall 74 of a support member 70 is abutted against an abutting portion between the second annular end surface 33 and the bottom plate 21 to prevent the short-passing of the combustion gas from this portion.

Abstract: The present invention provides a gas generator in which short-passing of combustion gas is prevented. A cylindrical filter 30 including a first annular end surface 32 abutted against a top plate 12 and a second annular end surface 33 abutted against a bottom plate 21 is disposed inside a housing 10. A corner portion 75 formed by a bottom surface 71 and an outer circumferential wall 74 of a support member 70 is abutted against an abutting portion between the second annular end surface 33 and the bottom plate 21 to prevent the short-passing of the combustion gas from this portion.

Abstract: The present invention provides a gas generator wherein a diffuser portion having a gas discharge port is disposed at one end of a cylindrical housing; an ignition device is disposed at the other end of the cylindrical housing; an axially-movable metallic partition wall having a plurality of through-holes is disposed between the ignition device and the diffuser portion; a space between the partition wall and the ignition device is an ignition device chamber charged with a molded article of a first gas generating agent; a space between the partition wall and the diffuser portion is a combustion chamber charged with a molded article of a second gas generating agent; the partition wall has a circular bottom surface and an annular wall extending, in a single direction, perpendicularly to an outer circumference of the circular bottom surface, and the circular bottom surface is disposed so as to be on the diffuser portion side; the ignition device has an igniter having a disk-shaped ignition portion protruding towar

Abstract: The present invention provides an igniter assembly in which reliability in operation is enhanced. An igniter assembly includes an igniter main body, a resin portion enclosing a periphery of the igniter main body, a metallic collar being arranged on a periphery of the resin portion and integrated with the resin portion, a cup-like shaped ignitor housing filled therein with a gas generating agent or a transfer charge. The metallic collar includes a combination of a cylindrical collar and an annular collar, and the cup-like shaped ignitor housing abuts against a portion with a reduced diameter on the side of a first end portion of the cylindrical collar, thereby being fixed from the outside.

Abstract: The present invention provides a gas generator wherein a diffuser portion having a gas discharge port is disposed at one end of a cylindrical housing; an ignition device is disposed at the other end of the cylindrical housing; an axially-movable metallic partition wall having a plurality of through-holes is disposed between the ignition device and the diffuser portion; a space between the partition wall and the ignition device is an ignition device chamber charged with a molded article of a first gas generating agent; a space between the partition wall and the diffuser portion is a combustion chamber charged with a molded article of a second gas generating agent; the partition wall has a circular bottom surface and an annular wall extending, in a single direction, perpendicularly to an outer circumference of the circular bottom surface, and the circular bottom surface is disposed so as to be on the diffuser portion side; the ignition device has an igniter having a disk-shaped ignition portion protruding towar

Abstract: A gas generator includes a cylindrical housing, a diffuser portion, a first combustion chamber defined by a first porous plate member, a second combustion chamber defined by a second porous plate member, and an ignition device having an ignition portion attached to an igniter collar. The first porous plate member comprises first through holes arranged in the vicinity of a peripheral edge portion. An annular space is formed between an outer peripheral surface of the ignition portion and an inner peripheral wall surface of the cylindrical housing. The height (H) of a top surface of the ignition portion from the igniter collar and a smallest length (Lmin) of a first gas generating agent in the first combustion chamber satisfies a relation Lmin<H. An axis of the cylindrical housing is coincident with a central line of the ignition portion, the first porous plate member, and the second porous plate member.

Abstract: A gas generator includes a cylindrical housing, a diffuser portion, a first combustion chamber defined by a first porous plate member, a second combustion chamber defined by a second porous plate member, and an ignition device having an ignition portion attached to an igniter collar. The first porous plate member comprises first through holes arranged in the vicinity of a peripheral edge portion. An annular space is formed between an outer peripheral surface of the ignition portion and an inner peripheral wall surface of the cylindrical housing. The height (H) of a top surface of the ignition portion from the igniter collar and a smallest length (Lmin) of a first gas generating agent in the first combustion chamber satisfies a relation Lmin<H. An axis of the cylindrical housing is coincident with a central line of the ignition portion, the first porous plate member, and the second porous plate member.

Abstract: In one embodiment, a HDD creates a segment table to associate an address of user data in a flash memory with an LBA in a magnetic disk. The HDD updates the segment table in a DRAM and saves it to the flash memory at a specific timing. The HDD creates journals indicating the update of the segment table and saves it to the flash memory. The latest segment table can be restored using the segment table and the journals in the flash memory.

Abstract: Embodiments of the present invention improve efficiency in saving log data in a hard disk drive (HDD) equipped with a magnetic disk and a flash memory,. In an aspect of one embodiment of the present invention, a HDD creates a segment table to associate an address of user data in a flash memory with an LBA in a magnetic disk. The HDD updates the segment table in a DRAM and saves it to the flash memory at a specific timing. The HDD creates journals indicating the update of the segment table and saves it to the flash memory. The latest segment table can be restored using the segment table and the journals in the flash memory.

Abstract: Embodiments of the present invention help to suppress adverse effects on the host computer operation caused by saving a segment table. According to one embodiment, a hard disk drive (HDD) creates a segment table to associate addresses of user data in a flash memory with LBAs in a magnetic disk. The HDD updates the segment table in a DRAM and saves it to the flash memory at a specific timing. The HDD creates a journal indicating an update of the segment table and saves it to the flash memory. The segment table and the journal in the flash memory enable the latest segment table to be restored. If the HDD receives a predetermined command from a host computer, it saves the segment table in the DRAM into the flash memory.