OXIDE MAGNETIC POWDER, OXIDE NONMAGNETIC POWDER AND MAGNETIC BAR CODE

Title:

OXIDE MAGNETIC POWDER, OXIDE NONMAGNETIC POWDER AND MAGNETIC BAR CODE

Document Type and Number:

Japanese Patent JPH0653024

Kind Code:

A

Abstract:

PURPOSE: To realize a magnetic bar code wherein discrimination between a magnetic bar and a nonmagnetic bar is difficult except magnetic signal processing, and oxide magnetic powder and nonmagnetic powder capable of being baked at a lower temperature are manufactured and applied to ink.

CONSTITUTION: As to oxide magnetic powder, material powder in NiO, ZnO, Mn3O4, Fe2O3, CuO and LiO is selected and baked at 650-1250°C to manufacture spinel type ferrite wherein chemical composition is expressed by a general formula {Ma1-xZnx}1-z.Mb2.Fe2+α.O4. As to oxide nonmagnetic powder, material powder in NiO, ZrO, Fe2O3, CuO and LiO is selected and baked at 750-1300°C to manufacture spinel type ferrite wherein chemical composition is expressed by a general formula Mcy.Zn1-y.Fe2+β.O4. A magnetic bar code is formed by using magnetic ink and nonmagnetic ink which contains oxide magnetic powder, oxide nonmagnetic powder, and the respective polymer compounds.

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Inventors:

SATO TADAKUNI
DAIGAKU HAJIME

Application Number:

JP19677992A

Publication Date:

February 25, 1994

Filing Date:

July 23, 1992

Export Citation:

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Assignee:

TOKIN CORP

International Classes:

G06K19/06; H01F1/00; H01F1/36; (IPC1-7): H01F1/36; G06K19/06; H01F1/00

Attorney, Agent or Firm:

Yosuke Goto (2 outside)

Next Patent: JOINT STRUCTURE OF SUPERCONDUCTOR