Detection mark and method and apparatus for detecting mark
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United States of America Patent
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May 11, 1993
Grant Date -
N/A
app pub date -
Jun 27, 1991
filing date -
Jun 29, 1990
priority date (Note) -
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Abstract
A detection mark comprising a pattern formed from a thin phosphor layer which emits a light having a different wavelength from that of an excitation light irradiated on a surface side of the phosphor layer, and an undercoat layer which is formed on a rear surface side of the phosphor layer and reflects the excitation light, which mark can be detected by intermittently irradiating the excitation light to the mark and reading a light or afterglow from the phosphor layer.
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