Recording medium
View Patent ↗An aspect of the present invention provides a recording medium including a matrix material and a magnetic material, wherein the contrast density of the surface is about 0.05 or less.
1. A recording medium, comprising:
a matrix material layer;
a wire-shaped magnetic material that overlaps or is integrated into at least a portion of the matrix material layer; and
an insulation material that is applied to the wire-shaped magnetic material, the insulation material being integrally adhered to a surface of the wire-shaped magnetic material in accordance with the shape thereof,
wherein the matrix material layer has a surface which has a contrast density equal to about 0.05 or less, the contrast density being a difference in optical density between:
(a) portions of the matrix material layer in which the wire shaped magnetic material is not integrated or overlapping; and
(b) portions of the matrix material layer in which the wire-shaped magnetic material is integrated or overlapping.
2. The recording medium of claim 1 , wherein the color of the surface is substantially representative of the hue of the matrix material layer.
3. The recording medium of claim 1 , wherein the matrix material layer contains pulp fiber.
4. The recording medium of claim 1 , wherein the wire-shaped magnetic material is coated with a layer containing a camouflage material.
5. The recording medium of claim 1 , wherein the insulation layer contains a polyimide resin or silica.
6. The recording medium of claim 3 , further comprising an adhesive that is applied to the matrix material layer.
7. The recording medium of claim 6 , wherein the adhesive is a paper strengthening agent or polyvinylalcohol.
8. The recording medium of claim 1 , wherein a camouflage material is contained in the matrix material layer.
9. The recording medium of claim 1 wherein the wire-shaped magnetic material and the matrix material layer are contained in a base material, and the recording medium further comprises a coating layer containing a camouflage material formed on at least one face of the base material.
10. The recording medium of claim 9 , wherein the camouflage material contains a pigment.
11. The recording medium of claim 1 ,wherein the contrast density of the surface is about 0.03 or less.
12. The recording medium of claim 1 , wherein the surface has a color that is substantially white.
13. The recording medium of claim 1 , wherein the wire-shaped magnetic material has a diameter of about 40 μm or less.
14. The recording medium of claim 1 , wherein the wire-shaped magnetic material has a length of about 10 mm or more.
15. The recording medium of claim 1 , wherein the wire-shaped magnetic material is coated with a layer containing a fluorescent material.
16. The recording medium of claim 15 , wherein the fluorescent material has a color being substantially representative of the hue of the matrix material layer.
17. The recording medium of claim 1 , wherein the insulation material is formed by a gas-phase deposition method or a liquid-phase coating method.