1, Shapes
* The standard marks shall be the following thirteen(13) marks. Marks other than those shown below can be recognized with a pattern matching function if a user creates a template.
* A triangle, checker pattern and user-designated template can be recognized even though you turn tem by 90 degrees.
circle●
square◼︎
Diamond◆
regular triangle▲
up-side-down triangle▼
checker pattern
cross+
inside-blank circle❍
inside-blank square❑
inside-blank diamond◇
inside-blank regular triangle△
inside-blank up-side-down triangle▽
checker pattern

2, Dimensions and tolerances
The outer dimension of a mark should be from 0.5mm to 3.0 mm, and its tolerance should be +-10% or lower
For an inside-blank mark, its outline width should be 0.2mm or wider

3, Clearance
In the clearance area around each recognition mark, there shall not be any other component such as a conductor pattern, solder resist and marking. The dimensions of this clearance area should be a square whose size is larger than the outer area of a recognition mark by 0.5mm or more.

4, Basic materials
* Copper not coated or coated as follows:
[Coating method]: Any of "transparent antioxidant coating," " nickel plating," "tin plating," "gold plating" and "hot-air leveler solder coating."
* The surface of a mark should be quite a contrast to the material of adjacent print wiring material.
* Control the quality of board recognition marks so that they cannot be oxidized or degraded.