Two-dimensional code reading device, two-dimensional code reading method, method of controlling manufacturing history information of member having substantially circular section orthogonal to the central axis thereof, and method of manufacturing the member using the control method
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United States of America Patent
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Feb 18, 2014
Grant Date -
Jan 26, 2012
app pub date -
Jun 23, 2009
filing date -
Jun 26, 2008
priority date (Note) -
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Abstract
A two-dimensional code reading device 20 is provided with image pickup device 22 which receives light reflected from either of a first inclined portion 12 and a second inclined portion 13 in a direction forming an angle θ satisfying expression (1) with respect to the normal-line direction R, and light source 21 which irradiates either of the inclined portions from a direction forming an angle α satisfying expression (2) with respect to the normal-line direction R:
where β is less than 90°,
- Δθ is not less than −10° but not more than 10°, andθ and α are angles in a turn direction reverse to a turn direction at which either of the inclined portions forms the angle β with respect to the normal-line direction R.
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