Gas generator particularly for a vehicle safety system

A gas generator for a vehicle safety system, comprising:

• an ignition unit including a holding element, an igniter and a base,
• wherein the base is formed by one single plastic injection molding so that the igniter is embedded in the base and the base is injection-molded to the holding element;
• wherein a membrane is provided which hermetically seals an inner first opening of the holding element;
• wherein a cup-shaped diffusor having second flow orifices is closed by a closure bottom,
• wherein a passage of the closure bottom is closed by an ignition unit by welding the holding element and
• wherein the diffusor and the closure bottom with the ignition unit form a major part of an outer housing of the gas generator;
• wherein an ignition cap has first flow orifices inside the gas generator and is movably positioned on an outside of the holding element such that, after activating the gas generator, an area of the outside of the holding element serves as a guide for shifting the ignition cap in a shifting direction;
• and
• wherein inside the ignition cap an ignition chamber with a first propellant is formed,
• wherein between a conical area of the holding element and the ignition cap an area of the ignition chamber tapering toward the first flow orifices of the ignition cap is formed.