Patent ID: 7984649

Claim:
A panel inspection apparatus that determines whether a quality of a panel to be inspected is good based on resonant frequencies obtained by vibrating panels determined as non-defective in advance, the panel inspection apparatus comprising: a vibrator that vibrates the panel; a vibration detector that detects vibrations of the panel; a resonant frequency extracting unit for extracting a plurality of resonant frequencies of the panel to be inspected by using the vibrator and the vibration detector; a resonant frequency selecting unit that selects one or more combinations of resonant frequencies consisting of two or more resonant frequencies with different vibration propagation paths among the plurality of resonant frequencies extracted by the resonant frequency extracting unit; a non-defective range generating unit for generating non-defective ranges related to a plurality of non-defective panels determined as non-defective in advance on coordinate systems in which the resonant frequencies are taken on coordinate axes by executing the resonant frequency extracting unit and the resonant frequency selecting unit and statistically processing a set of the combinations of resonant frequencies selected for each non-defective panel; and a panel quality determining unit for determining whether the quality of the panel to be inspected is good based on comparison between combinations of resonance frequencies selected for the panel to be inspected and the non-defective ranges generated by the non-defective range generating unit upon executing the resonant frequency extracting unit and the resonant frequency selecting unit for the panel to be inspected.