CN85100923A - Magnet board, electronic blackboard, photosensitive blackboard - Google Patents

Abstract

The blackboard of displaying kind is various, uses magnetic to write pen respectively, and electric writing pen, light are write pen or the television scanning method is write.

The magnetic bead blackboard writes pen with magnetic and the magnetic sheet wiping forces double-colored magnetic bead to rotate, and is mangneto counter-rotating blackboard of displaying.

Magnetic nail blackboard simple structure, but the bar-shaped permanent magnetism nail body that sucking-off pushes is housed on porous blackboard.

Magneto-optic blackboard and electric lighted blackboard utilize magnetic semiconductor and bistable trigger to make the switch drive light-emitting display device respectively.

Electrophoresis blackboard, electrochromism blackboard, liquid crystal blackboard utilizes corresponding Display Technique respectively.

Photosensitive blackboard has several selected light-sensitive materials.

The scanning of tele-board available television is write, and also available electric writing pen is hand-written, is the ideal tools of electronic teaching.

Description

Magnet board, electronic blackboard, photosensitive blackboard

The invention belongs to pen control Display Technique, my independent technique invention is wherein promptly arranged, the application invention of electronic display technology is arranged again.

Prior art before the application is No. 4143472 magnetic writing boards of United States Patent (USP), but the present invention starts from 1966, and the time is far early than United States Patent (USP).

Initial purpose of the present invention is without chalk, stops dust from flying, avoids sucking in the lung, impairs one's health.Because the application of electronic display technology.Can develop into the modernized instrument of audio-visual education programme to the tele-board direction.

Pen control demonstration property blackboard must possess two necessary conditions.One. Memorability two must be arranged. must wipe in the front.

The present invention includes nine kinds of inhomogeneity shapes, divide four kinds of different Writing methods.

With what magnetic write that pen writes the magnetic bead blackboard arranged.Magnetic nail blackboard, the magneto-optic blackboard.

With what electric writing pen was write electrophoresis blackboard arranged.The electrochromism blackboard.Electric lighted blackboard and liquid crystal blackboard.

What write with light pen is photosensitive blackboard (photochromic blackboard)

What write with television scanning and two kinds of hand-written methods of electroprobe is tele-board.The particular content division is as follows:

(1) sees accompanying drawing 1.Alcohol 2 ， And are housed in flat glass box 1 has a large amount of hollow magnet steel beads 3 to suspend wherein, a magnetic pole coating black, and another magnetic pole coating white can rotate flexibly.When writing, write under the strong magnetic pole effect at magnetic.Person's handwriting institute extremely, magnetic bead white magnetic pole turns to the outside.The display white writing.When wiping, wipe under the strong magnetic pole effect at magnetic sheet.Magnetic bead black magnetic pole more laterally, writing is wiped, invention in 1966 that Here it is.

(2) see accompanying drawing 2.On black graphite cake or plastic plate 1, have that internal diameter has small increase gradually in densely covered aperture 2. holes, permanent magnetism is housed in the hole slightly becomes the bar-shaped plunger 3 of taper type, tiny as nail is followed closely so be called for short magnetic, is gripper shoe 4 behind the hole.When blackboard did not have word, the magnetic nail goed deep into plate hole.The plate face is black entirely.When sliding on the blackboard surface,,, make that the magnetic nail is preceding to be moved so attract mutually because the magnetic pen magnetic pole is opposite with magnetic nail outer end magnetic pole with the strong bar-shaped lettering pen of magnetic.White nail end exposes the plate face, can see white person's handwriting.When embrocating with the ferromagnetism blackboard eraser, blackboard eraser repels with the magnetic nail mutually with magnetic pole of the same name.So moving the entering in the hole in magnetic nail back stays dark hole, writing is wiped.Magnetic nail blackboard advantage has two, the simplest ， And of structure and needn't see through glass and observe.

(3) the magneto-optic blackboard will be made switch element with magnetic semiconductor.This semi-conductive performance is seen from the 41st page of the Japanese Kawaguchi auxilliary work in the third of the twelve Earthly Branches " invention " Chinese edition.

Blackboard panel is made up of many small squares or point-like display unit.Each display unit, as shown in Figure 3.Be divided into photophore layer 1, drive circuit layer 2, ferrite magnetic bisque 3, magnetic semiconductor layer 4 is formed.All unit all are fixed on the monoblock skin not on the alloy sheets 5, form tabular integral body.When writing with magnetic pen, the magnetic magnetization also keeps memory, and the direction of magnetization makes the magnetic semiconductor conducting trigger drive circuit works, makes photophore luminous, forms luminous characters.Magnetic magnetic reversal when wiping with magnetic sheet, magnetic semiconductor ends, and driver quits work, and photophore extinguishes.

(4) electrophoresis blackboard is to utilize electrophoretic display technology.See from teachers college, south China work " radio electronics " book volume two P312, quote that the text is as follows as proof:

Electrophoresis showed is to be operation material with colloidal solution, and it has two types, and a kind of is BW-05 type colloidal solution, is dispersant with the dibromotetrafluoromethane, dissolves TiO 2 particles, adds the charging agent again and forms colloidal solution.Add electric field, TiO 2 particles moves on to negative plate and becomes white, and solvent is a black, so can carry out white and black displays.Still keep white after electric field is removed, show so can realize storage.When negative pole becomes positive pole.TiO 2 particles slip into solution then numeral be wiped free of.

In addition, put down in writing among the table 11-4-4 in book, the high little power consumption of the black white contrast of electrophoresis showed has Memorability, about 75 volts of operating voltages.

Also put down in writing with electrophoresis showed in this book and made electronic clock.

The structure of electrophoresis blackboard as shown in Figure 4, electrophoresis liquid 2 is housed in flat glass box 1, there is metallic conduction rete 3 at the box back side, be attached to glass outer surface, as battery lead plate, batteries 4 is arranged, total voltage is greater than 150 volts, three lead-in wires are arranged, and middle leads is connected with battery lead plate.Negative wire is connected with electric writing pen, and positive wire is wiped with electroplax and is connected.So the voltage between electric writing pen and the electrophoresis blackboard is greater than 75 volts.Voltage between electroplax wiping and the electrophoresis blackboard is also greater than 75 volts.

Electric writing pen is the hairbrush shape clavate thing that the tip of the brushstyle of a writing or painting has filament, interior conduction, wire and blackboard friction when external insulation is write.Negative electrical charge is stayed on the plate face.So white writing occurs.Electroplax is wiped and is also used the fine wire manufacturing, and hand is taken SI semi-insulation.When embrocating, the negative electrical charge on blackboard surface is removed, and positive charge stays, so writing disappears.

(5) the electrochromism blackboard is to utilize the electrochromism display packing.See from U.S. S Xie Er work " electronic console " book, P221.Quote that the text is as follows as proof:

When electric field was added on certain material, its light absorbing characteristic changed.This material most of energy when it is not subjected to encouraging see through visible light, but after adding electric field.Just absorption band occurs, present visible colour.After electric field is removed.Colour still keeps.But apply and originally caused the opposite electric field of plate of colored variation.It returns to original pellucidity again.

Electrochromism blackboard structure is similar to electrophoresis blackboard, just puts into the interlayer of electrochromism material in the middle of the glass.In fact this blackboard can become the blue word of blank, but teaching not necessarily must the blackboard wrongly written or mispronounced character with blackboard.Contained according to 1984 the 6th phase P10 of " knowledge and life " magazine article " how colour effect influences life ".The existing blank Dark grey word of France.

(6) electric lighted blackboard.The surface is made up of the luminescent device of the old arrangement of point, it below the photophore circuit layer, drive circuit is arranged, flip-flop circuit and power line, bistable trigger is the switch of drive circuit, trigger end leads to the blackboard surface with thin wire, it behind the backboard gripper shoe, useable glass, metal, plastics manufacturing, when writing with electric writing pen, tip of the brushstyle of a writing or painting current potential triggers and to start drive circuit and photophore is luminous, and when the electricity consumption blackboard eraser was embrocated, the blackboard eraser current potential triggers closed the drive circuit photophore and extinguish.

(7) liquid crystal blackboard is to utilize suitable lcd technology, sees from the upright flower of Japan youth's work " liquid crystal knowledge " book too, quotes that the text is as follows as proof:

The mixture of nematic liquid crystal APAPA and the black pure pelargonate of courage black liquid crystal mutually courage shows nematic phase.Add the LCF below 100 hertz, in 30 milliseconds, milkiness just appears in liquid crystal cell, remove electric field after, the milkiness state is constant, contrast 7: 1.If when adding the AC field more than 700 hertz.Then the milkiness state is fed back into original pellucidity.

So electric writing pen will be connected with the low-frequency power below 100 hertz.Electroplax is wiped and will be connected with the AC power more than 700 hertz.

There is the point-like transparency electrode in the front of liquid crystal cell, is covered with the monoblock blackboard, and each transparency electrode is all used superfine lead outlet box outer surface, is the monoblock battery lead plate behind the box.

(8) photosensitive blackboard; can utilize the photochromic material manufacturing; draw from U.S. S Davis work " computer data display " P339 photochromic; most of photochromic material is an organic dyestuff; under home light; it has the characteristic of printing opacity, but just light tight in ultraviolet (nearly 3800 dusts) following time in the exposure of utmost point short time.

So available ultraviolet light pen is write, but method for deleting does not have record.

From U.S. S Xie Er work " electronic console " P224 to 226 ferpic ferroelectric picture device light write method and reversed electric field method for deleting are arranged in addition, but it is not quite clear to look outward appearance.

Photo chromic glass also can be made research material.

The special benefits of photosensitive blackboard is can not contact to write, can write at a distance.

(9) tele-board is placed large screen television in the middle of the audio-visual classroom dais, each tele-board of the right and left is drilled in the TV and put teacher's teaching, and teacher's writing on the blackboard appears on the tele-board separately, and can remain into after class.Blackboard and TV are to drill with same video-tape to put, and this kind video recording has the double image track part.One be TV as mark, another is that writing on the blackboard is as mark.

This tele-board also can be used the autotelegraph stroke handwriting.Teacher in the TV puts question to the student by seat number, and this life is answered questions in writing to the blackboard designation area, and blackboard shows that correct option for student's ratio then.Tele-board is a kind of of electronic blackboard.

It is also conceivable that the luminescence generated by light black print in addition, pneumatic blackboard, pneumatic luminous blackboard, and pressure-sensitive blackboard, but be not included in the application's the claim Therefore, omited.

Claims (9)

1. (1) is contained in alcohol in the flat glass box bead that the heterochromatic permanent-magnet steel in hollow the two poles of the earth makes that suspending, can write under the attraction repulsive interaction that pen and magnetic sheet wipe at magnetic and rotate flexibly, be the reverse magnetic bead blackboard of display of mangneto in fact.
2. (2) in the hole of porous plate, be inserted with the spike scapus plug that permanent-magnet steel is made, write at magnetic under the active force of pen and magnetic sheet wiping, can seesaw, because of kinetic energy display white writing before the nail end face white, the back dark hole occurs when moving, and writing is wiped.This simply constructed magnetic nail blackboard.
3. (3) utilize magnetic semiconductor to make the magnetoluminescence blackboard of switch drive photophore, i.e. magneto-optic blackboard.
4. (4) electrophoresis blackboard of writing with electric writing pen that utilizes that electrophoretic display technology makes.
5. (5) electrochromism " blackboard " of writing with electric writing pen that utilizes that the electrochromism technology makes.Because of electrochromism can be blue look, so plate can be white.
6. (6) different potentials that utilizes electric writing pen and electroplax to wipe contacts the plain conductor exit on blackboard surface, thereby triggers bistable switch, and it is luminous to drive luminescent device, or photophore is extinguished.This is electroluminescent electric lighted blackboard.
7. (7) liquid crystal blackboard that utilizes the suitable lcd technology that Memorability is arranged to make.
8. (8) photosensitive blackboard that utilizes light-sensitive material to make.
9. (9) the available television scan method is write, the hand-written tele-board of available again electric writing pen.

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