Lighting unit for reading marks
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United States of America Patent
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-
Jan 2, 2001
Grant Date -
N/A
app pub date -
Jun 22, 1998
filing date -
Jun 23, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An object of the invention is to obtain a lighting unit for reading marks which makes it possible with accuracy to read a mark carved on a surface of a base whose surface is specular finished. A lighting unit for reading marks in accordance with the invention comprises two light sources 51 and 52 and a light parallel means 6 which makes rays of light emitted from each of the light sources 51 and 52 parallel or generally parallel respectively. Each of the rays of light emitted from the light sources 51 and 52 are made parallel respectively by the light parallel means 6 and irradiated on two areas 18 and 19 of the base 3 and the two areas 18 and 9 face each other across the mark 4 carved on the base 3.
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