JPH07314981A - Display board and writing instrument for display board - Google Patents

Abstract

(57) [Abstract] [Purpose] In an information display board using a reversible photochromic material or thermochromic material, in order to erase the written display contents, scroll the display unit and apply light or heat to the entire surface once. There is a method to erase a large area at once with a blackboard eraser or the like, but it is not suitable for deleting details. Therefore, we provide a pen exclusively for erasing so that details can be erased. An erase-only eraser having an erase width wider than the effective write width of a writing pen or element.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display board which uses a photochromic material which exhibits a reversible reaction for a display portion and which is written on the display portion by light and erased by light.

[0002]

2. Description of the Related Art Recently, an information display board using a photochromic material in which a reversible reaction occurs has been proposed. For these writing and erasing, a dedicated manual pen is attached, it has a structure that emits ultraviolet rays for writing and switches to visible light for erasing,
The effective widths of writing and erasing light irradiation are equal.

[0003]

However, in the above erasing method, since the width of writing and erasing are the same, it is difficult to erase the erased portion by tracing once.

Therefore, an object of the present invention is to provide a display board which can be easily erased by tracing the erased portion once.

[0005]

In order to achieve this object, a writing pen and an erasing pen are separately provided, and the erasing effective width of the erasing pen is set to be equal to or larger than the effective displaying width of the writing pen.

[0006]

With the structure as described above, it is possible to erase a line forming a character or a figure by tracing the line once written with a writing pen once, and it is possible to easily erase a detail in a short time.

[0007]

EXAMPLES An example of the present invention will be described below.
FIG. 1 shows a schematic view of a display board in one embodiment of the present invention. 1 is an outer frame of the display board, 2 is a display sheet,
3 is a fixed leg. Further, 4 is a writing pen and 5 is an erasing pen. 6 is a power supply unit. By tracing the display sheet 2 with the writing pen 4, characters and figures can be written, and with the erasing pen 5, the display portion to be erased can be erased.

FIG. 2 shows an enlarged view of the writing pen in one embodiment of the present invention. As shown in FIG. 2, the writing pen 4 includes a main body central portion 21, a tip portion 22, a tip opening portion 23,
It comprises a power supply section 24, a power supply on / off switch 25, and a power supply cord 26, and the effective write width is a.

FIG. 3 is a sectional view of the tip of the writing pen according to the embodiment of the present invention. A light source 27 for emitting ultraviolet rays is arranged above the tip opening 23.

FIG. 4 shows an enlarged view of the erase pen in one embodiment of the present invention. As shown in FIG. 4, the main body 4
1, a tip portion 42, a tip opening portion 43, a power source portion 44, a power source on / off switch 45, and a power cord 46, and the effective erase width is indicated by b.

FIG. 5 shows a sectional view of the tip of the erasing pen in one embodiment of the present invention. A light source 47 for emitting visible light is arranged above the tip opening 43.

There are two differences between the writing pen 4 and the erasing pen 5, and the first is that the wavelength of the light source is different. Generally, ultraviolet light is used for writing and visible light is used for erasing. Second, the effective write width a of the tip portions 22 and 42 is smaller than the effective erase width b, that is, a <b.

Next, the erasing procedure will be described with reference to FIG.
It is assumed that a drawing having a line width a is drawn with the writing pen 4 on the display sheet 2 including the photochromic material. a-1 to a-4
Indicates the line width a. Writing is performed by tracing the display sheet 2 with the writing pen 4. Since the line portion 62 is an unnecessary portion, it is erased. When light is emitted from the tip of the erasing pen 5 with a line width b and the portion to be erased by the erasing pen 5 is traced, the traced portion of the display sheet 2 of the photochromic material is erased and part of the figure is lost. That is, the erase pen 5
The desired line portion 62 can be easily erased by placing the tip of the line portion 62 at the end portion 63 of the erased portion and moving along the line portion 62 to the end portion 64 opposite to the erased portion.

3 and 5, the structure is such that the light sources 27 and 47 are provided inside the pen. However, by using a fiber 71 as shown in FIG. 7, light is guided from an external light source,
It is also possible to have a light emitting source in the power supply unit 6 of FIG. 7
2 is the effective width of writing or erasing.

As the photochromic material, there is a material which is colored by light and is erased by heat, and the erasing pen 5 is shown in FIG.
The structure shown in FIG. 8A or FIG. 8B is also possible. That is,
A heat generating portion 81 is provided at the tip of the erasing pen 5, and a metal 82 for keeping heat is attached to the tip of the erasing pen 5. Further, the thin pipe 84 guides the hot air from the heat source to the tip of the erasing pen 5, and in this case, it may be blown directly on the display surface, or a metal 86 for keeping heat is attached to the tip of the erasing pen 5. Alternatively, the hot air escape port 85 may be provided slightly in front of the tip of the erasing pen 5 to adjust the temperature. 83 and 87 are
The effective width at the time of erasing is shown, and this width corresponds to the erasing effective width b in FIG.

[0016]

According to the present invention, the erase effective width of the eraser is set to be larger than the display effective width of the writing pen so that only the character or part of the drawing desired to be erased is traced. Can be easily erased with. Therefore, it is possible to provide a writing instrument for a display board and an eraser which are characterized in that they can be erased with a simple operation and can be completed accurately in a short time.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a display board according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a writing pen according to an embodiment of the present invention.

FIG. 3 is a sectional view of a tip of a writing pen according to an embodiment of the present invention.

FIG. 4 is an enlarged view of an erase pen according to an embodiment of the present invention.

FIG. 5 is a cross-sectional view of the tip of an erasing pen according to an embodiment of the present invention.

FIG. 6 is an explanatory view of a concrete working method of the display board in the embodiment of the present invention.

FIG. 7 is a diagram showing an example of a writing / erasing pen according to another embodiment of the present invention.

FIG. 8 is a diagram showing an example of an erase pen according to another embodiment of the present invention.

[Explanation of symbols]

 1 display board outer frame 2 display sheet 3 fixed leg 4 writing pen 5 erasing pen 22 tip 23 tip opening 25 power on / off switch 26 power cord 27 light source 42 tip 43 tip opening 45 power on / off switch 46 power Code 47 light source

Claims (3)

[Claims] 1. A writing sheet which changes its color tone by irradiation with colored light having a specific wavelength and returns to a normal color tone by irradiation with colored light having a wavelength different from that of the colored light, and a writing pen which emits the colored light. An erasing pen having an irradiation width larger than an irradiation width of the colored light of the writing pen. 2. A writing instrument for a display board, which is used for a display board having a writing sheet which changes its color tone when irradiated with a colored light having a specific wavelength and returns to a normal color tone when irradiated with a decolored light having a wavelength different from said colored light. A writing instrument for a display board, comprising: a writing unit that emits the colored light; and an erasing unit that has an irradiation width larger than an irradiation width of the writing unit. 3. An erasing pen for erasing a line segment on a display board drawn by a writing pen, wherein the erasing effective width is wider than the writing effective width of the writing pen.