JPH02144124U - - Google Patents

Info

Publication number

JPH02144124U

JPH02144124U JP5222789U JP5222789U JPH02144124U JP H02144124 U JPH02144124 U JP H02144124U JP 5222789 U JP5222789 U JP 5222789U JP 5222789 U JP5222789 U JP 5222789U JP H02144124 U JPH02144124 U JP H02144124U

Authority

JP

Japan

Prior art keywords

objective lens

light

optical disc

optical

amount

Prior art date

1989-05-02

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

• 230000003287 optical effect Effects 0.000 claims description 9
• 238000001514 detection method Methods 0.000 claims description 5
• 238000007689 inspection Methods 0.000 claims description 4
• 230000005856 abnormality Effects 0.000 claims description 2
• 230000002159 abnormal effect Effects 0.000 claims 1
• 230000001678 irradiating effect Effects 0.000 claims 1
• 238000010586 diagram Methods 0.000 description 3
• 238000006243 chemical reaction Methods 0.000 description 1
• 239000011521 glass Substances 0.000 description 1
• 239000004065 semiconductor Substances 0.000 description 1