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A gas generator is provided with a metal housing constituted by an initiator shell and a closure shell, a combustion chamber which is formed inside the housing and into which gas generants generating a high-temperature gas through combustion are loaded, a filter member disposed around the combustion

A gas generator is provided with a metal housing constituted by an initiator shell and a closure shell, a combustion chamber which is formed inside the housing and into which gas generants generating a high-temperature gas through combustion are loaded, a filter member disposed around the combustion chamber, an igniter mounted into the housing and igniting and burning the gas generants inside the combustion chamber and a plurality of gas discharge openings formed on the housing and discharging the gas generated in the combustion chamber.

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What is claimed is: 1. A gas generator comprising: a metal housing constituted by an initiator shell and a closure shell, a combustion chamber which is formed inside the housing and into which gas generants generating a high-temperature gas through combustion are loaded, a filter member disposed ar

What is claimed is: 1. A gas generator comprising: a metal housing constituted by an initiator shell and a closure shell, a combustion chamber which is formed inside the housing and into which gas generants generating a high-temperature gas through combustion are loaded, a filter member disposed around the combustion chamber, an igniter mounted into the housing and igniting and burning the gas generants inside the combustion chamber, and a plurality of gas discharge openings formed on the housing and discharging the gas generated in the combustion chamber, wherein either or both of the initiator shell and the closure shell constituting the housing are provided with semi-spherical or semi-oval end plate portions and cylindrical portions having a diameter D continuously formed from said end plate portions, a ratio H/D of the bottom distance H between the end plate portion of the initiator shell and that of the closure shell to the diameter D of the cylindrical portions is in the range from 0.4 to 1.3, and a ratio A/At of a total sum (A) of surface areas of gas generants to the total sum (At) of the opening areas of the gas discharge openings is in excess of 1300 and not more than 2000, wherein the gas discharge openings have first and second opening diameters (D1, D2) and are disposed in two arrays in a zigzag form, the first opening diameter (D1) being smaller than the second opening diameter D2, and wherein a relation of a distance d between gas discharge openings in an axial direction of the housing, the first opening diameter (D1), and the second opening diameter (D2) is represented by d≧(D1+D2)/2. 2. A gas generator according to claim 1, wherein the gas discharge openings comprise two or more opening diameters. 3. A gas generator according to claim 1, wherein the gas discharge openings are disposed in a single array or in a plurality of arrays. 4. A gas generator according to claim 1, wherein a ratio D1/D2 is in a range of from 0.1 to 1.0. 5. A gas generator according to claim 1, which comprises a rupture member wherein the gas discharge openings are closed by said rupture member and said rupture member comprises a metal plate made of aluminum, steel or stainless steel. 6. A gas generator according to claim 5, wherein said rupture member is in a range from 0.01 mm to 0.3 mm in thickness. 7. A gas generator according to claim 5, wherein said rupture member is provided so as to be different in strength depending on an opening diameter of the gas discharge openings and a strength level of the rupture member is increased corresponding with a decrease in diameter of the gas discharge openings. 8. A gas generator according to claim 5, wherein with respect to a strength level of said rupture member which is attached to each of a plurality of gas discharge openings having a different opening diameter, the strength level of the rupture member is adjustable such that T1/T2=D2/D1 and is in the range of from 2 to 8 when T1/T2=D2/D1, wherein T1 is a strength of value said rupture member which is attached to a gas discharge opening having said first opening diameter D1, T2 is a strength of value said rupture member which is attached to a gas discharge opening having said second opening diameter D2.