Memory card includes a circuit board, a component mounted on a main face of the circuit board, casing covering at least the main face of the circuit board and the component, and bittering agent retained in a roughened area provided on casing or an exposed part of the circuit board.
1. A memory card comprising:
a circuit board;
a component mounted on a main face of the circuit board; and
a casing covering at least the main face of the circuit board and the component,
wherein a roughened area of average roughness of 0.1 μm or more to 100 μm or less is provided in a logo area of the casing, and only a bittering agent is retained in the roughened area.
2. The memory card of claim 1 , wherein the roughened area has a pearskin pattern.
3. The memory card of claim 1 , wherein the roughened area has a groove formed on one of the casing and the exposed part of the circuit board.
4. The memory card of claim 3 , wherein the groove is a fine linear groove formed on one of the casing and the exposed part of the circuit board.
5. The memory card of claim 1 , wherein the roughened area has a foamed concavo-convex pattern formed on one of the casing and the exposed part of the circuit board.
6. The memory card of claim 1 , wherein the roughened area is provided on a corner of one of the casing and the circuit board.
7. The memory card of claim 1 , wherein average roughness Ra of the roughened area is not less than 0.1 μm and not greater than 100 μm.
8. A memory card comprising:
a circuit board;
a component mounted on a main face of the circuit board;
a casing covering at least the main face of the circuit board and the component; and
an identification part attached to one of the casing and the circuit board,
wherein only a bittering agent is retained in one of between the identification part and the casing, between the identification part and the circuit board, and on the casing around the identification part or on the circuit board.
9. The memory card of claim 8 , wherein the identification part is one of a label and a coloring layer.
10. The memory card of claim 9 , wherein an adhesive layer formed in the label contains the bittering agent.
11. The memory card of claim 9 , wherein the bittering agent is retained in a fine concavity formed on a surface of the label.
12. The memory card of claim 9 , wherein an adhesion layer formed in the coloring layer contains the bittering agent.