| 摘要 |
PURPOSE:To prevent poor checking and increase in costs, to improve safety and to shorten checking time by providing a vibration imparting means which imparts mechanical vibration to an electronic part which is mounted on a board. CONSTITUTION:This apparatus is composed of the following parts: a CPU 1; a white noise generator 2 which generates white noise based on a command from the CPU 1; a variable-band type bandpass filter 3 which shapes the noise into a desired shape; a simple type reverberation chamber 6; a reverberation meter 7; and a spectrum analyzer 8. At first, the mechanical resonant frequency of a lead 9b of an electronic part 9a is obtained. The filter 3 is adjusted so that input power spectrum in approximately normal distribution with the frequency as the center is obtained. Then, a noise generating command is sent into the generator 2 from the CPU 1. The noise is shaped as specified with the filter 3 and amplified in an amplifier 4. The noise is transduced into mechanical vibration with a speaker 5. The vibration is imparted to the part 9a. Thus, the mechanical vibration in the form of a sound wave is imparted to all leads 9b provided in the part 9a. The defective soldering of the leads 9b is judged based on the reverberation 7. |
