JPH0136157Y2 - - Google Patents

Info

Publication number

JPH0136157Y2

JPH0136157Y2 JP454581U JP454581U JPH0136157Y2 JP H0136157 Y2 JPH0136157 Y2 JP H0136157Y2 JP 454581 U JP454581 U JP 454581U JP 454581 U JP454581 U JP 454581U JP H0136157 Y2 JPH0136157 Y2 JP H0136157Y2

Authority

JP

Japan

Prior art keywords

piezoelectric ceramic

detection device

object detection

lid

protrusion

Prior art date

1981-01-19

Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)

Expired

Links

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• 239000000919 ceramic Substances 0.000 claims description 45
• 238000001514 detection method Methods 0.000 claims description 21
• 239000000463 material Substances 0.000 claims description 5
• 230000002093 peripheral effect Effects 0.000 claims description 2
• 230000010355 oscillation Effects 0.000 description 23
• 229910052751 metal Inorganic materials 0.000 description 5
• 239000002184 metal Substances 0.000 description 5
• 239000000758 substrate Substances 0.000 description 5
• 238000010586 diagram Methods 0.000 description 4
• 238000005259 measurement Methods 0.000 description 4
• 230000003287 optical effect Effects 0.000 description 2
• 229910052573 porcelain Inorganic materials 0.000 description 2
• 239000000843 powder Substances 0.000 description 2
• RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
• 238000010521 absorption reaction Methods 0.000 description 1
• 239000000853 adhesive Substances 0.000 description 1
• 230000001070 adhesive effect Effects 0.000 description 1
• 229910052782 aluminium Inorganic materials 0.000 description 1
• XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
• 229910052802 copper Inorganic materials 0.000 description 1
• 239000010949 copper Substances 0.000 description 1
• 239000012530 fluid Substances 0.000 description 1
• 239000008187 granular material Substances 0.000 description 1
• 238000000034 method Methods 0.000 description 1
• 230000001902 propagating effect Effects 0.000 description 1
• 230000000007 visual effect Effects 0.000 description 1