CA2070068A1 - Magnetic display system - Google Patents

Magnetic display system

Info

Publication number
CA2070068A1
CA2070068A1 CA2070068A CA2070068A CA2070068A1 CA 2070068 A1 CA2070068 A1 CA 2070068A1 CA 2070068 A CA2070068 A CA 2070068A CA 2070068 A CA2070068 A CA 2070068A CA 2070068 A1 CA2070068 A1 CA 2070068A1
Authority
CA
Canada
Prior art keywords
magnetic particles
light
microcapsules
absorptive
coating layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA2070068A
Other languages
French (fr)
Other versions
CA2070068C (en
Inventor
Masayuki Nakanishi
Yasuyuki Kanno
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Japan Capsular Products Inc
Tomy Co Ltd
Original Assignee
Japan Capsular Products Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Japan Capsular Products Inc filed Critical Japan Capsular Products Inc
Priority to CA002070068A priority Critical patent/CA2070068C/en
Priority to AU17364/92A priority patent/AU654712B2/en
Priority to NZ243080A priority patent/NZ243080A/en
Priority to EP92113068A priority patent/EP0580891B1/en
Publication of CA2070068A1 publication Critical patent/CA2070068A1/en
Priority to US08/181,442 priority patent/US5411398A/en
Application granted granted Critical
Publication of CA2070068C publication Critical patent/CA2070068C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
    • B43L1/00—Repeatedly-usable boards or tablets for writing or drawing
    • B43L1/008—Repeatedly-usable boards or tablets for writing or drawing with magnetic action
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/37—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being movable elements
    • G09F9/375—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being movable elements the position of the elements being controlled by the application of a magnetic field
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/09—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on magneto-optical elements, e.g. exhibiting Faraday effect
    • G02F1/094—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on magneto-optical elements, e.g. exhibiting Faraday effect based on magnetophoretic effect
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/249921—Web or sheet containing structurally defined element or component
    • Y10T428/249994—Composite having a component wherein a constituent is liquid or is contained within preformed walls [e.g., impregnant-filled, previously void containing component, etc.]
    • Y10T428/249995—Constituent is in liquid form
    • Y10T428/249997—Encapsulated liquid
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
    • Y10T428/256—Heavy metal or aluminum or compound thereof
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
    • Y10T428/256—Heavy metal or aluminum or compound thereof
    • Y10T428/257—Iron oxide or aluminum oxide
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
    • Y10T428/2984—Microcapsule with fluid core [includes liposome]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
    • Y10T428/2984—Microcapsule with fluid core [includes liposome]
    • Y10T428/2985—Solid-walled microcapsule from synthetic polymer

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

The invention of the present application relates to a magnetic display system using a display, wherein a non-magnetic substrate is applied thereonto with a microcapsule coating layer having sealed light-absorptive magnetic particles and light-reflective non-magnetic particles which are dispersed in an oily liquid, and a permanent magnet for causing a shift of the light-absorptive magnetic particles in one direction and, as a result, causing a shift of the light-reflective non-magnetic particles in the other direction. Objects of the invention reside in that the movability of the light-absorptive magnetic particles and the light-reflective non-magnetic particles are intensified when these particles are shifted in the microcapsules to invert the position, the agglomeration property of the light-absorptive magnetic particles after the position is inverted is strengthened, and the combination between the size of the particle diameters of the microcapsules and the size of the particle diameters of the light-absorptive magnetic particles and the light-reflective non-magnetic particles is optimized, whereby the contrast of brightness and darkness of characters and images formed on the display is improved and the side edge portions of the characters and images are made sharper.
For this, in the microcapsule coating layer, the microcapsules having a plurality of particle diameters within a range from 100 microns to 1,000 microns are combined together.
Furthermore, as the light-absorptive magnetic particles sealed in the microcapsules, the light-absorptive magnetic particles having a plurality of particle diameters ranging from 0.2 micron to several microns are used. Furthermore, a suitable amount of magnetic particles having characteristics capable of becoming the permanent magnet when magnetized after the microcapsule coating layer is coated is added. Furthermore, the mean particle diameter of the light-reflective non-magnetic particles sealed in the microcapsules ranges from 0.01 micron to several microns. Furthermore, a suitable amount of the microcapsules having a particle diameter far more minute than the mean particle diameter of the microcapsules and having sealed only the transparent oily liquid is added to the microcapsule coating layer.
CA002070068A 1992-05-29 1992-05-29 Magnetic display system Expired - Lifetime CA2070068C (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CA002070068A CA2070068C (en) 1992-05-29 1992-05-29 Magnetic display system
AU17364/92A AU654712B2 (en) 1992-05-29 1992-06-02 Magnetic display system
NZ243080A NZ243080A (en) 1992-05-29 1992-06-09 Display sign - magnetic and non-magnetic microcapsules dispersed in oily liquid
EP92113068A EP0580891B1 (en) 1992-05-29 1992-07-31 Display screen for magnetic image recording
US08/181,442 US5411398A (en) 1992-05-29 1994-01-14 Magnetic display system

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
CA002070068A CA2070068C (en) 1992-05-29 1992-05-29 Magnetic display system
AU17364/92A AU654712B2 (en) 1992-05-29 1992-06-02 Magnetic display system
NZ243080A NZ243080A (en) 1992-05-29 1992-06-09 Display sign - magnetic and non-magnetic microcapsules dispersed in oily liquid
EP92113068A EP0580891B1 (en) 1992-05-29 1992-07-31 Display screen for magnetic image recording
US08/181,442 US5411398A (en) 1992-05-29 1994-01-14 Magnetic display system

Publications (2)

Publication Number Publication Date
CA2070068A1 true CA2070068A1 (en) 1993-11-30
CA2070068C CA2070068C (en) 2000-07-04

Family

ID=27506625

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002070068A Expired - Lifetime CA2070068C (en) 1992-05-29 1992-05-29 Magnetic display system

Country Status (5)

Country Link
US (1) US5411398A (en)
EP (1) EP0580891B1 (en)
AU (1) AU654712B2 (en)
CA (1) CA2070068C (en)
NZ (1) NZ243080A (en)

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Also Published As

Publication number Publication date
AU654712B2 (en) 1994-11-17
EP0580891A1 (en) 1994-02-02
CA2070068C (en) 2000-07-04
NZ243080A (en) 1994-08-26
AU1736492A (en) 1993-12-16
US5411398A (en) 1995-05-02
EP0580891B1 (en) 1997-03-12

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