An attachment device attachable to a string, rope, cord or other flexible line that remains in a fixed position on the line without knotting the line or clamping the device to the line. The chamber section is made up of a plurality of port members 1 coupled together, each port member 1 including the pipe section 7 and a cylindrical section 6 whose external wall is connected to an end of the pipe section 7. The system includes a language component to enable programming of comprehension notations in an imperative language and an interface component to describe a meaning of the comprehension notations. The detection circuit is electrically connected to the primary-side winding and the power switch. , printing contents determined based on information on a first lens array or the like after formation, is printed on the surface of the first lens array at one time. Adjacent strings are isolated by shallow trench isolation structures.