CN2422144Y

CN2422144Y - Electromagnetic dustless blackboard

Info

Publication number: CN2422144Y
Application number: CN 00202617
Authority: CN
Inventors: 魏荣忠
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-02-22
Filing date: 2000-02-22
Publication date: 2001-03-07
Anticipated expiration: 2010-02-22

Abstract

The utility model relates to an electromagnetic dustless blackboard which is designed by referring to the principle of a permanent magnet writing board in the current market. The utility model has main changes that the handwriting is cleared by an electromagnetic field which replaces a permanent magnet. Accordingly, the utility model is provided with an electromagnetic device which is composed of an electromagnetic coil and a magnetic core and is provided with an iron board which is made of pure iron sheets and is used for extending the electromagnetic field and is arranged at the back of a writing board. Secondly, in order to be suitable for the writing requirements of large area, the iron board at the back of the writing board is formed by a plurality of blocks by combination and assembly. The writing area of the utility model can expand, and the operation is convenient. The utility model does not consume chalks and does not have dust pollution in the use process.

Description

The Electromagnetic dustless blackboard

The utility model belongs to the writing appliance technical field, is a kind of Electromagnetic dustless blackboard.

The magnetic writing panel products comes into the market, its principle is after utilizing the black magnetic and white non-magnetic mixing, under the effect in magnetic field, separate and develop (writing) or remove (wiping), promptly be sealed in by framework mixing magnetic, panel, in the flat box that back plate is formed, write outside its transparent panel with magnetic pen, thereby with the inner surface of black magnetic attraction at panel, see through panel and just can see the blackness handwriting of writing, if need to remove (wiping) writing, then another magnet (as bar magnet) is produced magnetic field at the back side of plate thereafter, with the inner surface of black magnetic attraction at the back plate, this moment, the inner surface of panel only stayed white non-magnetic, and former blackness handwriting then is wiped free of.This product can use clipboard repeatedly, and consumes chalk and stay dust pollution when not having normal blackboard and writing.But this product all adopts permanent magnet as the magnetic field sources of wiping at present, and it is easily demagnetization not only, and mechanically actuated is often dumb, and bigger problem is that it can only make monolithic, and area is very little, is difficult to satisfy the needs of large-area writing.

The purpose of this utility model just is to utilize above know-why and compensate its defect, and provides a kind of easy to operate and can satisfy the Electromagnetic dustless blackboard of large-area writing requirement.

The purpose of this utility model is achieved in that a kind of Electromagnetic dustless blackboard, comprise: framework (1), panel (2), mixing magnetic (3), back plate (4), control box (5), it is characterized in that: the back side at back plate (4) is glued with iron plate (6), and the center, the back side of iron plate (6) is fixed with the calutron of being made up of solenoid (7) and magnetic core (8) that generates an electromagnetic field.Like this, when the blackness handwriting that needs to remove on (wiping) panel, as long as solenoid is switched on, produced the electromagnetic field of a moment, this electromagnetic field magnetizes iron plate rapidly again, produce a large-area magnetic field, then remove (wiping) work and can finish immediately.Certainly will realize more large-area wiping, an iron plate is not enough, needs the iron plate more than 2, and all mixes the calutron of being made up of solenoid and magnetic core correspondingly on every iron plate.Supporting with it should also have power supply, operating key, control box and corresponding circuit.

Adopt effect of the present utility model to be: the area of blackboard can enlarge with the increase of the quantity of iron plate, adopts electric control, and is easy to operate.

The utility model is described in further detail below in conjunction with drawings and Examples:

Fig. 1 is the front view (cutaway view) of the utility model embodiment.

Fig. 2 is the left view of Fig. 1.

Fig. 3 is the right view of Fig. 1.

Fig. 4 is the enlarged drawing of solenoid among Fig. 1 (7), magnetic core (8) and iron plate (6) combined state.

Fig. 5 is the circuit diagram of the utility model embodiment.

Embodiment: as Fig. 1, Fig. 2, Fig. 3, shown in Figure 4, framework (1), panel (2), mixing magnetic (3), back plate (4) all are the main parts size of known technology, just some difference on size, material.Control box (5) is positioned at the bottom of framework, and it is mechanical in known technology, and the utility model adopts electric control, so it becomes an electric power control box that holds electric elements (as battery, lead, switch).

What be close to the back plate is six iron plates (6), and it is the thin plate made from pure iron, and effect is to transmit electromagnetic field---magnetisable but remanent magnetism is few.A calutron of being made up of solenoid (7) and magnetic core (8) all is equipped with at the center, back of every iron plate, solenoid is around the outside of magnetic core, its effect is to generate an electromagnetic field after the energising, an end face of magnetic core then is bonded in the center, back of iron plate tightly with adhesive, purpose is that electromagnetic field is passed to iron plate, makes iron plate magnetize and magnetic field is extended to the surface of iron plate.Like this, when the user writes on panel with magnetic pen, it is separated and be attracted to the inner surface of panel to mix black magnetic in the magnetic, see through transparent panel and just can see blackness handwriting after writing, if when needing to remove (wiping) these writings, then electric current is fed solenoid---instantaneous feeding makes magnetic core produce magnetic field, iron plate is also by flash magnetization, thereby the black magnetic all absorbed the inner surface of back plate.At this moment, the inner surface of panel only stay white non-magnetic---blackness handwriting is " erased ".

Used " blackboard " this specific term in the title of the present utility model, this only is in order to adapt to people's custom, and in fact it just the color with " blackboard " user mode is opposite---background color is a white, i.e. " blank ", and writing is a black.

Because the magnetic field area that the electromagnetic field that calutron produces is expanded on iron plate is limited, the area of an iron plate also can not be done too greatly, so a big blackboard often needs the combination of several piece iron plate, so it is so simple that the also non-iron plate of circuit design, is overlapped calutron, Fig. 5 shows the combination of six iron plates of present embodiment and supporting six cover calutron states circuit diagrams is down arranged, the monolithic removing be provided in this circuit diagram, removed in flakes, three kinds of full scale clearance operate the control schemes.

As shown in Figure 5: D is a power supply, generally uses dry cell, and promptly safety can prevent again having a power failure.M is a solenoid, totally 6, and from M ₁-M ₆, be connected in parallel.Be in series with a press button on each M, totally 6, from K ₁-K ₆, be used for monolithic and remove: as long as click K ₁-K ₆In any, M that can it is corresponding carries out the lip-deep writing that the iron plate of this M correspondence of instantaneous energising-promptly remove is occupied.Button switch K _A, K _BBe the sheet switch, be used for removing in blocks: K _AControl M ₁-M ₃, K _BControl M ₄-M ₆If click K _AButton, then M ₁-M ₃M has also just been removed in all instantaneous energising quickly ₁-M ₃The lip-deep writing that three corresponding iron plates are occupied if these three iron plate having a mind to are arranged in the first half of blackboard, has then just been removed whole writings of the blackboard first half quickly.In like manner, K _BThen corresponding to the Lower Half of blackboard.Button K is a master switch, is used for full scale clearance, because it can all control M ₁-M ₆

According to present embodiment, can push away this and that design the blackboard that area differs in size, the scheme of the removing in blocks in its circuit also can be designed to a few types, to adapt to user's request and to be convenient to user operation.

Claims

1, a kind of Electromagnetic dustless blackboard, comprise: framework (1), panel (2), mixing magnetic (3), back plate (4), control box (5), it is characterized in that: the back side at back plate (4) is glued with iron plate (6), and the center, the back side of iron plate (6) is fixed with the calutron of being made up of solenoid (7) and magnetic core (8) that generates an electromagnetic field.

2, blackboard according to claim 1 is characterized in that the quantity of said iron plate (6) is at least 2, and iron plate (6) quantitatively is one-to-one relationship with solenoid (7) and magnetic core (8).