Desk pad

Abstract

To provide an underlay which can obtain the effect to increase feeling of achievement and commitment of learning by accumulating and leaving handwriting seeable at the time of writing.SOLUTION: An underlay 1 includes: a pressure-sensitive coloring layer that can make handwriting 5 seeable by coloring parts that receive pen pressure on at least one surface of a flat substrate; and a surface layer 2 that covers a surface of the pressure-sensitive coloring layer. It is preferable that the surface layer 2 is tracing paper, and the pressure-sensitive coloring layer is a coloring agent in which a colored material is kneaded into an oil-like substance, and solidified on a surface of the substrate.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a writing pad that has pressure-sensitive coloring properties and allows piled-up handwriting to remain visible. [Background technology]

[0002] A writing pad is a stationery item that is placed under paper to make it easier to write letters and designs, and to prevent bleed-through or indentations on the desk or other pages. Traditionally, in addition to these general functions, writing pads have been offered that have added value by incorporating additional functions.

[0003] Patent Document 1 describes an underlay containing a coloring agent such as a pH indicator, which can be used to repeatedly draw letters and patterns or to make hidden printed letters visible by contacting a coloring aid to develop and / or erase color. Patent Document 2 describes an underlay in which pieces of paper with printed learning content and the like are inserted freely between two colored synthetic resin sheets treated with a thermochromic resin, and the printed content of the pieces of paper becomes visible when the synthetic resin sheets turn colorless due to body heat. These underlays have the added value of being able to switch between displaying and hiding letters and patterns, making them useful for character practice and rote learning.

[0004] The inventors of the present invention have investigated a writing pad with new added value not described in Patent Documents 1 and 2. As a result, they have found that by leaving handwriting on the writing pad almost permanently during use, the accumulated traces of letters, pictures, etc. become visible, thereby enhancing a sense of accomplishment and attachment to the learning experience. They have also concluded that a suitable means for achieving this is to create a writing pad that can be colored by pressure. Patent Document 3 describes a pressure-sensitive recording sheet on which letters, etc. can be recorded by pressure, but this pressure-sensitive recording sheet is recording paper whose surface is protected by a protective coating to prevent damage from water, oil, etc. Patent Document 3 does not mention or suggest anything about applying a pressure-sensitive recording structure to a writing pad whose base material is a hard material. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Utility Model Application Publication No. 60-142992 [Patent Document 2] Japanese Utility Model Application Publication No. 63-163989 [Patent Document 3] Japanese Patent Application Publication No. 6-262847 Summary of the Invention [Problem to be solved by the invention]

[0006] An object of the present invention is to provide a writing pad that can enhance a sense of accomplishment and attachment to learning by visualizing and accumulating handwriting during use. [Means for solving the problem]

[0007] In order to solve the above problem, the underlay is provided with a pressure-sensitive coloring layer on at least one surface of a flat substrate, which is capable of coloring areas that receive writing pressure, thereby making handwriting visible, and a surface layer that covers the surface of the pressure-sensitive coloring layer.

[0008] The surface layer is preferably tracing paper.

[0009] The pressure-sensitive coloring layer is preferably a pressure-sensitive transfer ink applied to the surface of the substrate.

[0010] The substrate preferably contains a PET resin. [Effects of the Invention]

[0011] The present invention makes it possible to provide a writing pad that can enhance a sense of accomplishment and attachment to learning by visualizing and accumulating handwriting during use. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 2 is a plan view of the underlay of the embodiment. [Figure 2] 1 is a schematic diagram showing a cross section of an underlay according to a first embodiment. [Figure 3] 1 is a schematic diagram showing an example of the process by which handwriting accumulates on the writing pad of the present invention, where (a) shows an unused state, and (b) to (d) show the progress of the increase in handwriting remaining on the writing pad as the number of uses increases. [Figure 4] FIG. 10 is a schematic diagram showing a cross section of an underlay according to a second embodiment. [Figure 5] 5 is a schematic diagram showing a cross section of an underlay in the second embodiment, in which the order of the color forming layer and the color developing layer is different from that of the example shown in FIG. [Figure 6] FIG. 10 is a schematic diagram showing a cross section of an underlay in which colorless ink capsules and a color developer are mixed in one layer in the second embodiment. [Figure 7] FIG. 10 is a schematic diagram showing a cross section of an underlay according to a third embodiment. [Figure 8] FIG. 10 is a schematic diagram showing a cross section of an underlay according to a fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0013] An embodiment of the invention is described below. As shown in FIGS. 1 and 2, the writing pad 1 of this embodiment is a rectangular writing pad of approximately A4 size in plan view, and is used for writing. At least one surface of a substrate 4, which forms the main body of the writing pad 1, is provided with a pressure-sensitive coloring layer 3 that can color areas subjected to writing pressure to make handwriting visible, and a surface layer 2 that covers the surface of the pressure-sensitive coloring layer 3. The pressure-sensitive coloring layer 3 can color handwriting 5 corresponding to pressure applied from a writing implement or the like using various mechanisms, which will be described later. The colored letters and designs can be seen through the front side of the surface layer 2, making the handwriting 5 visible.

[0014] As shown in FIG. 1 , the underlay 1 of this embodiment has a main body 11 with a laminated structure in which layers overlap in the thickness direction, and a peripheral edge 12 that surrounds the entire periphery of the main body 11. It is preferable for the entire underlay 1 to be laminated (pouched) with a transparent resin film (not shown) to protect it from dirt and damage. In this case, the entire surface may be pressure-bonded, or only the peripheral edge 12 may be pressure-bonded. Furthermore, when the surface layer 2 itself is formed of a resin film, it is preferable to thermocompress the surface layer 2 and the base material 4 at the peripheral edge 12. The peripheral edge 12 may be bonded using an adhesive in addition to thermocompression. In this way, if the laminated structure of the underlay 1 is fixed by bonding the peripheral edge 12, the underlay 1 can have few steps.

[0015] Like a typical writing pad, the underlay 1 is placed under the paper on which the writing is to be done. When pressure from the tip of a writing implement is applied through the paper to the surface of the underlay 1, the pressured area develops color, leaving traces of the writing on the underlay 1. As a result, as shown in Figures 3(a) to (d), the number of handwriting marks 5 increases the more the underlay 1 is used. Although there may be gradations in the darkness and thickness of the lines of the handwriting 5 depending on the strength of the writing pressure and the recency of the handwriting, the handwriting marks 5 generally do not disappear but accumulate, so using the underlay 1 can have the effect of increasing a sense of accomplishment and attachment to the learning. Furthermore, if the user is a child, for example, the underlay 1 can become a sentimental item for the parent after use.

[0016] The components constituting the laminated structure of the underlay 1 will now be described. In the embodiment, the substrate 4 is a smooth, hard, flat plate. In the embodiment, the material of the substrate 4 is a resin containing PET resin, but this is not limited to this, and a paper material such as cardboard may also be used. The hardness and thickness can also be set as appropriate. In the embodiment, the pressure-sensitive coloring layer 3 and the surface layer 2 are provided on both sides of the substrate 4, but they may be provided on only one side.

[0017] The surface layer 2 is formed from a material that allows the handwriting 5 colored by the pressure-sensitive coloring layer 3 to be visible from the outside of the underlay 1. For example, in the embodiment shown in Figure 2, the surface layer 2 is semi-transparent tracing paper. An appropriate material for the surface layer 2 can be selected depending on the coloring mechanism of the pressure-sensitive coloring layer 3.

[0018] Various mechanisms for coloring the handwriting 5 can be applied to the pressure-sensitive coloring layer 3. Hereinafter, the pressure-sensitive coloring layer 3 will be described in first to fourth embodiments.

[0019] (First embodiment) In the first embodiment, as shown in FIG. 2, a colorant 31 is applied to and fixed on the surface of the substrate 4, forming a pressure-sensitive coloring layer 3. The colorant 31 in this embodiment is a carbon ink used in known carbon paper. Carbon ink is a pressure-sensitive transfer ink. When writing pressure or other pressure is applied to the surface of a paper or other material placed on top of the carbon ink, the carbon ink in the pressure-sensitive area is transferred to the back surface of the paper or other material. Carbon ink is a solid ink made by mixing pigments such as carbon black, indigo, or red with oils, fats, or wax. It can be applied to the substrate 4 by heating it to a liquid state. The color of the carbon ink used in the present invention is not limited, and various pigments can be used. The surface layer 2 in this embodiment is translucent tracing paper. When writing pressure is applied to the underlay 1, the colorant 31 in the pressure-applied area adheres to the back surface 22 of the surface layer 2, transferring the handwriting 5. The handwriting 5 transferred onto the back surface 22 can be seen from the front surface 21 side of the surface layer 2 due to the transparency of the tracing paper.

[0020] (Second embodiment) The second embodiment is equipped with a coloring mechanism used in known carbonless paper. As shown in FIG. 4 , this embodiment includes a coloring layer 32 containing fine capsules filled with colorless ink on the back surface of the surface layer 2, and a color developer layer 33 coated with a color developer capable of producing a color reaction when in contact with the colorless ink on the surface of base paper 34. When writing pressure is applied from the front side of the surface layer 2, the capsules in the coloring layer 32 break at the pressure, causing the colorless ink inside to seep out and chemically react with the color developer in the color developer layer 33 to develop a color. This results in handwriting 5 being drawn on the surface of the base paper 34. It is preferable that the surface layer 2 covering the base paper 34 be made of a transparent film or resin sheet, as this makes the handwriting 5 appear more clearly. The surface layer 2 is not limited to a transparent material; it may also be made of a transparent paper or resin that allows the handwriting 5 to be visible. Also, as shown in FIG. 5 , the coloring layer 32 and the color developer layer 33 may be provided in the reverse order to that shown in FIG. 4 . As shown in FIG. 6, a mixed layer 35 in which the capsules and the developer are mixed in one layer may be provided on the surface of the base paper 34.

[0021] (Third embodiment) In the third embodiment, as shown in FIG. 7, a coloring layer 32 is formed on the back surface 22 of the surface layer 2, and a color developing layer 33 is formed on the surface of the substrate 4. When writing pressure is applied to the writing pad 1 of this embodiment, handwriting 5 is written on the surface of the substrate 4 by a mechanism similar to that of the second embodiment. In this embodiment, it is preferable that the substrate 4 is made of paper such as cardboard, as this ensures stable coloring of the handwriting 5. The surface layer 2 is preferably made of a transparent film or resin sheet so that the handwriting 5 on the surface of the substrate 4 can be more clearly seen. Note that the surface layer 2 is not limited to a transparent material, and paper or resin that has transparency that allows the handwriting 5 to be visible may also be used.

[0022] In the third embodiment, the color-forming layer 32 may be provided on the surface of the substrate 4, and the color-developing layer 33 may be provided on the back surface 22 of the surface layer 2. In this case, the handwriting 5 is written on the back surface 22 of the surface layer 2. In this case, it is preferable to use translucent paper or the like for the surface layer 2 to ensure stable color development and visibility. Also, in this embodiment, a configuration may be provided in which a mixed layer is provided in which the capsules and the color developer are mixed in one layer.

[0023] (Fourth embodiment) In the fourth embodiment, as shown in Fig. 8, known carbon paper 36 is used as the pressure-sensitive coloring layer 3. The surface of the carbon paper 36 facing the surface layer 2 is coated with a colorant 31 similar to that in the first embodiment. When writing pressure is applied to the underlay 1 of this embodiment, the colorant 31 in the pressure-applied portion adheres to the back surface 22 of the surface layer 2, transferring the handwriting 5. It is preferable to use translucent tracing paper or the like for the surface layer 2, as this provides excellent visibility of the handwriting 5 and coloring stability.

[0024] Although the present invention has been described above by taking the embodiments as examples, the present invention is not limited to the above-described embodiments and can be embodied in various forms. [Explanation of symbols]

[0025] 1 writing pad 2 Surface layer 21 Surface 22 Back side 3 Pressure-sensitive coloring layer 31 Coloring Agent 32 Coloring layer 33 Chromogenic layer 34 Original paper 35 Mixed layer 36 Carbon Paper 4 Base material

Claims

1. The underlay has a laminated structure including a flat substrate, a pressure-sensitive coloring layer that can color areas that receive writing pressure to make handwriting visible, and a surface layer that covers the surface of the pressure-sensitive coloring layer, and the handwriting is transferred to any of the members that make up the laminated structure and accumulates without disappearing.

2. 2. The underlay according to claim 1, wherein the surface layer is tracing paper.

3. 3. The underlay according to claim 1, wherein the pressure-sensitive coloring layer is a pressure-sensitive transfer ink applied to the surface of the base material.

4. A main body having a laminated structure in which the substrate, the pressure-sensitive coloring layer, and the surface layer are stacked in the thickness direction; a peripheral portion surrounding the entire periphery of the main body portion, The underlay according to any one of claims 1 to 3, wherein the laminated structure is fixed by adhesive bonding of the peripheral edge portion.

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