发明名称 |
Handheld code reader with optimal optical reading distance |
摘要 |
In the optical system of a code reader, its MTF best position on the subject side at a spatial frequency corresponding to a code pattern is set to be present at a given distance from the end surface of the code reader. The light receiving surface of a photosensor is set larger than the image of one block of the code pattern which is formed through the optical system.
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申请公布号 |
US6571025(B2) |
申请公布日期 |
2003.05.27 |
申请号 |
US19990311491 |
申请日期 |
1999.05.13 |
申请人 |
OLYMPUS OPTICAL CO., LTD. |
发明人 |
NADA YOSHIYUKI |
分类号 |
G06K7/10;(IPC1-7):G06K9/22 |
主分类号 |
G06K7/10 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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