| 摘要 |
<p>PURPOSE: To attempt increase of sound volume by preventing a resonance effect emitted from a piezoelectric buzzer from being interrupted by a method wherein a softly fixing agent is removed from upper and lower parts of a recess part of a cover sheet in which a piezoelectric buzzer is held in a structure of the cover sheet with the fixing agent for an IC card having the piezoelectric buzzer. CONSTITUTION: In a IC card having a piezoelectric buzzer, a recess part is formed in an IC card substrate 1, and the piezoelectric buzzer 2 is held in the recess part. Besides, a void 3 doubling as a resonant space 7 is formed by the recess part. Then, an IC card is completed by sticking cover sheets 5, 5' to which softly fixing agents 4, 4' are applied, to upper and lower surfaces of the IC card substrate 1. In that case, upper and lower surfaces of the recess part holding the piezoelectric buzzer 2 are formed as parts 6, 6' wherein the softly fixing agents 4, 4' provided to the cover sheets 5, 5' are removed. A phenomenon wherein sound volume is to be reduced by absorption of resonance emitted from the piezoelectric buzzer 2 by the softly fixing agents 4, 4', is thereby avoided.</p> |
