CN2792810Y

CN2792810Y - Dust-proof blackboard

Info

Publication number: CN2792810Y
Application number: CN 200520083729
Authority: CN
Inventors: 秦永刚
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-04-24
Filing date: 2005-04-24
Publication date: 2006-07-05
Anticipated expiration: 2015-04-24

Abstract

The utility model relates to a dustless blackboard which uses a magnetic pen as a main body and comprises a magnetic pen and a magnetic blackboard eraser, wherein magnetic particles are evenly and densely distributed in a blackboard body, and the polarity of a magnetic pole near a blackboard surface is different from the polarity of the magnetic pen and is the same as the polarity of the surface of the magnetic blackboard eraser. The magnetic blackboard device uses the theory of the interaction of magnets to realize the purpose that the magnetic pen is used to write and display handwriting on the blackboard surface, and the handwriting is eliminated by the blackboard magnetic eraser. The utility model realizes the purposes of writing and dust wiping on a blackboard surface with large areas and has the advantages of reasonable structure, low cost and easy operation.

Description

Dust-free blackboard

Affiliated technical field

The utility model belongs to teaching aid, is a kind of based on magnet board, comprises the blackboard device of magnetic pen, magnetic blackboard eraser.

Background technology

The blackboard device of conventional teaching usefulness is made up of blackboard, chalk and blackboard eraser, no matter be which kind of type blackboard in use, all as the writing surface of chalk, write back blackboard eraser wiping, the deficiency of its maximum is the pollution of dust, and the dust-free blackboard of other type is also failed penetration and promotion because of its cost is higher.

Summary of the invention

The purpose of this utility model is to provide a kind of dust-free blackboard. and this device utilizes the interaction principle of ferromagnetic material, by magnetic chalk the magnetic particle in the plate body is adsorbed under the blackboard transparent thin board surface, black and white contrast by magnetic particle and plate body shows writing, the surface polarity of magnetic blackboard eraser is identical with magnetic particle polarity, in wiping process magnetic particle is pushed plate body, writing can disappear.

The purpose of this utility model is to realize like this, a kind of dust-free blackboard is provided with a magnet board, one magnetic blackboard eraser and a magnetic pen, plate body (3) back side (2) at magnet board evenly is thick with groove (5), wherein be provided with magnetic and show particle (6), rete (1) is bonded at the plate body back side magnetic is shown that the particle block is in groove, the thin plate of transparent material (4) sticks on the front surface of plate body, magnetic blackboard eraser (7) and magnetic pen (8) are made by magnetic material, the blackboard eraser surface and the magnetic pen tip of the brushstyle of a writing or painting are all with soft anti-protection pad, magnetic shows that particle (6) is different near the magnetic pole and the magnetic pen tip of the brushstyle of a writing or painting polarity of plate face in the groove, identical with the polarity on blackboard eraser surface, magnetic shows particle (6) and the bigger color of plate body (3) selection contrast.

Plate body is wherein made by wooden, plastics or glass material, and thick about 15-20mm is aterrimus, the groove at the plate body back side, dark 14-19mm, spacing 1mm, diameter 2-2.5mm, magnetic shows that particle is the white bar-shaped magnet that is slightly less than groove, transparent thin board (4) is the thick glass plate of 1mm; Plate face, magnetic pen and magnetic blackboard eraser shape size are similar to conventional blackboard panel, chalk and blackboard eraser.

This blackboard newspaper is according to the interaction principle of magnet, utilize the magnetic-particle evenly gather in plate body to realize submitting a written statement to a higher authority at the plate face and draw the purpose that shows writing and utilize magnetic blackboard eraser elimination writing with magnetic pen. solved on larger area plate face write, the dust problem of wiping, be a kind of rational in infrastructure, cost is lower, dust-free blackboard easy to implement.

Description of drawings

Fig. 1 is the back side groove of plate body, the schematic diagram that magnetic shows distribution of particles and topped rete;

Fig. 2 is the magnetic blackboard eraser schematic diagram;

Fig. 3 is the magnetic pen schematic diagram.

The specific embodiment

The utility model is described in further detail in conjunction with the accompanying drawings:

During use, blackboard is hung on the wall, the white bar-shaped magnetic-particle (6) that is embedded in black plate body (3) groove (5) can move forward and backward in poor, magnetic pen (8) tip of the brushstyle of a writing or painting is on the plate face during paddling, white particle in the groove can be drawn to 1mm place down, plate body (3) surface, because little bar magnet evenly gathers and the black and white contrast, so can under the thick glass plate of 1mm, demonstrate the clear preferably writing of stroke continuity, because the surface polarity of the magnetic blackboard eraser among Fig. 2 (7) is identical with particle polarity in the groove, the little bar magnet in plate body surface can be pushed back groove depths writing during wiping can disappear, for preventing that magnetic pen and blackboard eraser from producing cut on the plate face, all be added with protective jacket at the tip of the brushstyle of a writing or painting and blackboard eraser surface.

Claims

1, a kind of dust-free blackboard, be provided with a magnet board, a magnetic blackboard eraser and a magnetic pen, it is characterized in that: plate body (3) back side (2) at magnet board evenly is thick with groove (5), is provided with magnetic and shows particle (6), and rete (1) is bonded at the plate body back side magnetic is shown that the particle block is in groove.

2, dust-free blackboard according to claim 1 is characterized in that: magnetic blackboard eraser (7) and magnetic pen (8) are made by magnetic material, and the blackboard eraser surface and the magnetic pen tip of the brushstyle of a writing or painting are all with soft anti-protection pad.

3, dust-free blackboard according to claim 1 is characterized in that: magnetic shows that particle is different near the magnetic pole and the magnetic pen tip of the brushstyle of a writing or painting polarity of plate face in the groove, and is identical with the polarity on blackboard eraser surface.