Title:
MAGNETIC SHEET, MAGNETIC WRITING SYSTEM, DRAWING METHOD, AND ERASING METHOD
Document Type and Number:
WIPO Patent Application WO/2022/029877
Kind Code:
A1
Abstract:
[Problem] To provide a magnetic sheet that is capable of displaying colors. [Solution] A magnetic sheet according to the present invention carries out display by the action of magnetic lines of force from a magnetic pen, and has formed therein a microcapsule layer that is interposed between upper and lower transparent sheets. The microcapsule layer contains first microcapsules 140A and second microcapsules 140B. The first microcapsules 140A each contain black magnetic particles 142A having a low magnetic susceptibility, whereas the second microcapsules 140B each contain red magnetic particles 142B having a high magnetic susceptibility. In the case of application of weak magnetic lines of force, the red magnetic particles 142B react, and in the case of application of strong magnetic lines of force, both the black magnetic particles 142A and the red magnetic particles 142B react.
Inventors:
KOGA RITSUO (JP)
Application Number:
PCT/JP2020/029803
Publication Date:
February 10, 2022
Filing Date:
August 04, 2020
Export Citation:
Assignee:
ZERO LAB CO LTD (JP)
International Classes:
B43L1/00
Foreign References:
| JPH04199086A | 1992-07-20 | |||
| JP4089808B2 | 2008-05-28 | |||
| JP2019072908A | 2019-05-16 | |||
| JPH05341719A | 1993-12-24 | |||
| JP2015505622A | 2015-02-23 | |||
| US20170336896A1 | 2017-11-23 |
Attorney, Agent or Firm:
KATAYOSE Kyozo (JP)
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