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Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
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Filing date
Publication date
Application filed by Matsushita Electric Industrial Co LtdfiledCriticalMatsushita Electric Industrial Co Ltd
Priority to JP15251376ApriorityCriticalpatent/JPS5376452A/en
Publication of JPS5376452ApublicationCriticalpatent/JPS5376452A/en
PURPOSE: A frost-detecting device devised to detect frosting correctly by using the oscillation of a vibrator provided with piezo-electric elements to detect frosting directly.