Patent ID: 7397170

Claim:
A piezoelectric spark-voltage generation mechanism for ignition that is provided with a base piece, a piezoelectric element, and an anvil housed in the longitudinal axis, an outer-box assembly on which a cam groove is formed in the longitudinal axis, an inner-box assembly in which a cam hole is formed and a hammer spring and a hammer for striking the piezoelectric element is housed, a joint-case assembly that limits the stroke of said outer assembly against said inner assembly, and an operation mechanism that makes a series of functions of generating a high-voltage pulse by striking the piezoelectric element on release and expansion of the compressed spring by using the force of compression and expansion of the hammer spring under application of one-directional compression force guided with a hammer pin inserted into said hammer, the cam groove, and the cam hole, comprises the joint-case assembly that encloses said operation mechanism to prevent foreign bodies from coming in, wherein the hammer pin is enclosed in the joint-case assembly.