JPH01104771U - - Google Patents

Info

Publication number

JPH01104771U

JPH01104771U JP20008887U JP20008887U JPH01104771U JP H01104771 U JPH01104771 U JP H01104771U JP 20008887 U JP20008887 U JP 20008887U JP 20008887 U JP20008887 U JP 20008887U JP H01104771 U JPH01104771 U JP H01104771U

Authority

JP

Japan

Prior art keywords

hole

clearance

circuit board

printed circuit

inner layer

Prior art date

1987-12-30

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.)

Pending

Links

• Espacenet
• Global Dossier
• Discuss

• RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
• 239000011889 copper foil Substances 0.000 claims description 3
• 238000005553 drilling Methods 0.000 claims description 2
• 238000007689 inspection Methods 0.000 claims 2
• 239000010410 layer Substances 0.000 description 2
• 239000002344 surface layer Substances 0.000 description 2
• 238000010586 diagram Methods 0.000 description 1
• 239000000758 substrate Substances 0.000 description 1