GB1288597A – – Google Patents
GB1288597A – – Google Patents
Info
Publication number
GB1288597A
GB1288597A
GB1288597DA
GB1288597A
GB 1288597 A
GB1288597 A
GB 1288597A
GB 1288597D A
GB1288597D A
GB 1288597DA
GB 1288597 A
GB1288597 A
GB 1288597A
Authority
GB
United Kingdom
Prior art keywords
field
film
lines
magnetic field
axes
Prior art date
1969-01-09
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.)
Expired
Application number
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.)
1969-01-09
Filing date
1969-10-09
Publication date
1972-09-13
1969-10-09
Application filed
filed
Critical
1972-09-13
Publication of GB1288597A
publication
Critical
patent/GB1288597A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
Classifications
G—PHYSICS
G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
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
G02F1/091—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 magneto-absorption or magneto-reflection
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
G02F1/29—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 position or the direction of light beams, i.e. deflection
G—PHYSICS
G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
G09G2300/00—Aspects of the constitution of display devices
G09G2300/06—Passive matrix structure, i.e. with direct application of both column and row voltages to the light emitting or modulating elements, other than LCD or OLED
Abstract
1288597 Light modulation; magneto-optic storage arrangements GENERAL ELECTRIC CO 9 Oct 1969 [9 Jan 1969] 49639/69 Headings H3B and H4F [Also in Division G5] An element 2 in a display system comprises a thin ferromagnetic film 23 constructed to have a regular magnetic domain structure which produces optical grating lines in an adjacent colloid 24 of ferromagnetic particles, and the grating lines in any elemental area may be rotated in the plane of the film by application thereto of a suitably directed magnetic field above a threshold value so that light from a source 1 is reflected and either passes through a viewing window 4 (line a, area A) or does not (lines b, area B). Two orthogonal sets of conductors 5, 6 (35, 36 in Fig. 4) provide a D.C. magnetic field at any selected area using XY addressors 34, 46, but since the plot of domain rotation against D.C. magnetic field is moderately linear, substantial cross-talk with other areas in the same X or Y lines occurs. The corresponding plot for an A.C. field shows a steep rise of rotation angle at a predetermined A.C. field strength, Fig. 5 (not shown). Therefore in the arrangement shown in Fig. 4 the resultant D.C. field, which is in either the X or Y direction according to the direction of current in lines 35, is chosen so as to be less than the threshold value, but is augmented by an A.C. field, also less than the critical value, from Helmholtz coils 39 along an axis α, commonly at 45 degrees to the X and Y axes, so that the domains are rotated to lie along either the X or Y axes, areas C and D, corresponding to write or erase operations, respectively. The A.C. field may be continuous, or pulsed simultaneously with the D.C. pulses from the addressors 34, 46, and in either case may contain a lower frequency A.C. component of above threshold value to provide a relatively slow automatic erasure, Fig. 3 (not shown), obviating the need for current reversal in line 35. In modifications, the A.C. field is directed along the Z or Y axes, Figs. 6 and 7 (not shown), and may be provided by means other than a Helmholtz coil, e.g. a flat field coil below the conductors 5, 6, or parallel conductors integral with the element 2, Figs. 8 and 9 (not shown). As described, the film is an 85% nickel 15% iron permalloy film, electroplated to a thickness of 20,000-30,000 over sputtered gold, using a sulphate bath. Application of a negative magnetostriction and a tensile stress to the film gave magnetostriction and internal stress values of opposite sign to form fine line changes in the magnetic field gradient normal to the film plane, corresponding to a striped domain structure at the film surface.
GB1288597D
1969-01-09
1969-10-09
Expired
GB1288597A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
US79003069A
1969-01-09
1969-01-09
Publications (1)
Publication Number
Publication Date
GB1288597A
true
GB1288597A
(en)
1972-09-13
Family
ID=25149430
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB1288597D
Expired
GB1288597A
(en)
1969-01-09
1969-10-09
Country Status (4)
Country
Link
US
(1)
US3545843A
(en)
DE
(1)
DE1950660A1
(en)
FR
(1)
FR2027966A1
(en)
GB
(1)
GB1288597A
(en)
Families Citing this family (6)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US3752563A
(en)
*
1971-09-01
1973-08-14
Sperry Rand Corp
Magnetic film stripe domain diffraction
US4055377A
(en)
*
1976-08-03
1977-10-25
Minnesota Mining And Manufacturing Company
Magnetically orientable retroreflectorization particles
US4513201A
(en)
*
1983-07-21
1985-04-23
Ball Corporation
Thermocouple detector
JPH0139478Y2
(en)
*
1984-12-29
1989-11-27
CN111855432B
(en)
*
2020-07-20
2021-03-30
华中科技大学
Device and method for testing stress-strain curve of titanium alloy material under high-temperature high-strain rate
CN114034548B
(en)
*
2022-01-12
2022-04-26
华中科技大学
Method for obtaining stress-strain curve of material under action of multiple effects
Family Cites Families (1)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US3347614A
(en)
*
1964-03-13
1967-10-17
Lab For Electronics Inc
Magnetic film display device
1969
1969-01-09
US
US790030A
patent/US3545843A/en
not_active
Expired – Lifetime
1969-10-08
DE
DE19691950660
patent/DE1950660A1/en
active
Pending
1969-10-09
FR
FR6934529A
patent/FR2027966A1/fr
not_active
Withdrawn
1969-10-09
GB
GB1288597D
patent/GB1288597A/en
not_active
Expired
Also Published As
Publication number
Publication date
DE1950660A1
(en)
1970-07-30
FR2027966A1
(en)
1970-10-02
US3545843A
(en)
1970-12-08
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Legal Events
Date
Code
Title
Description
1973-01-24
PS
Patent sealed [section 19, patents act 1949]
1975-05-07
PLNP
Patent lapsed through nonpayment of renewal fees
