Magnetic display erasing apparatus including a plurality of magn

Details Magnetic display erasing apparatus including a plurality of magn Magnetic display erasing apparatus including a plurality of magn

1996-11-26

1999-11-09

Hajec, Donald

Registers

Records

Magnetic

235449, 360118, G06F 1906

Patent

active

059797746

ABSTRACT:
A magnetic display erasing apparatus is provided in which an ideal erasing magnetic field can be realized by using a small-sized magnet. A magnet is formed by bending a rectangular plate-like magnet, having the N-pole on the surface and the S-pole on the back face, into a U-shape so that the N-pole of one end of the magnet confronts the N-pole of the other end thereof symmetrically with respect to a magnetic display sheet. The magnetic display sheet is conveyed by a conveying apparatus, which is not shown, in the U-shaped gap space which is formed by the magnet. Because the magnetic field is symmetrical with respect to the plane of the magnetic display sheet, an ideal planar magnetic field is attained on the disposition plane of the magnetic display sheet. There is no point where the strength of the magnetic field is zero. Therefore, the whole region of the empty space can be used for erasure and the space utilization efficiency of the magnet is enhanced.

REFERENCES:
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patent: 4613919 (1986-09-01), Miyatake et al.
patent: 4675476 (1987-06-01), Kobayashi
patent: 5132860 (1992-07-01), Von Stein
patent: 5186631 (1993-02-01), Okutsu
patent: 5359183 (1994-10-01), Skodlar
patent: 5643686 (1997-07-01), Isshiki et al.
patent: 5787619 (1998-08-01), Urushibata
patent: 5790006 (1998-08-01), Abele et al.

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