Code reader and code reading method for reading hole code

A code reader for optically reading a code from an object surface of an object comprising:

• said code including plural holes formed in said object surface, said holes having a hole base face at a regular depth from said object surface, said hole base face being provided with a high optical reflectance;
• a photosensor, set so as to adapt a detection distance thereof to said hole base face, for outputting a sensor signal, said sensor signal being at an effective detection level in response to detection of said hole base face, and being at a non-detection level when in a non-detection state without said detection of said hole base face,
• wherein the object includes said object surface as part of an end face of a tubular form.

A code reader for optically reading a code from an object surface of an object comprising:

• said code including plural holes formed in said object surface, said holes having a hole base face at a regular depth from said object surface, said hole base face being provided with a high optical reflectance;
• a photosensor, set so as to adapt a detection distance thereof to said hole base face, for outputting a sensor signal, said sensor signal being at an effective detection level in response to detection of said hole base face, and being at a non-detection level when in a non-detection state without said detection of said hole base face,
• wherein said plural holes are contiguous with said object surface, such that the plural holes comprise voids in said object surface.

A code reading method of optically reading a code from an object surface of an object, said code including plural holes formed in said object surface, said code reading method comprising a step of:

• said holes having a hole base face at a regular depth from said object surface, said hole base face being provided with a high optical reflectance;
• scanning said code with a photo sensor relatively, for reading said holes if said photo sensor detects that optical reflectance of said hole base face is said high reflectance, said code being read according to arrangement of said holes, said photo sensor outputting a sensor signal, said sensor signal being at an effective detection level in response to detection of said hole base face, and being at a non-detection level when in a non-detection state without said detection of said hole base face,
• wherein the object includes said object surface as part of an end face of a tubular form.

A code reading method of optically reading a code from an object surface of an object, said code including plural holes formed in said object surface, said code reading method comprising a step of:

• said holes having a hole base face at a regular depth from said object surface, said hole base face being provided with a high optical reflectance;
• scanning said code with a photo sensor relatively, for reading said holes if said photo sensor detects that optical reflectance of said hole base face is said high reflectance, said code being read according to arrangement of said holes, said photo sensor outputting a sensor signal, said sensor signal being at an effective detection level in response to detection of said hole base face, and being at a non-detection level when in a non-detection state without said detection of said hole base face,
• wherein said plural holes are contiguous with said object surface, such that the plural holes comprise voids in said object surface.