JPH0537298U - Discoloration tool tip - Google Patents

Abstract

(57) [Abstract] [Purpose] A convenient color-changing tool for obtaining a desired thermo-color-change image by contacting or writing on the thermo-color-changing layer of a thermo-color-changing object provided with a thermo-color-changing layer Provides tip structure. A specific shape (a tip end portion 41 having a tip end of a dot shape, a linear shape or a narrow width and a heat transfer base portion 42) on a heat absorption side A of a thermoelectric conversion element 3 having a Peltier effect that functions by applying a low voltage.
(Comprising) is connected to form the tip portion 1 of the electro-cooling discoloration tool. Since the leading edge (the contact point to the thermochromic layer) is formed to the necessary minimum, the heat loss is small and it contributes to the continuation of the discoloring function by continuous writing.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a tip of a color changing tool. More specifically, the present invention relates to the tip of an electrochromic device that functions by applying a low voltage.

[0002]

[Prior Art]

 Conventionally, as a means for changing the color of the thermochromic layer of a thermochromic object having a thermochromic layer that changes color due to temperature change, an electric heating tool equipped with a resistance heating element such as tungsten or nickel has been developed. No. 62-139573, JP-A No. 62-201178 and the like. On the other hand, a portable and convenient cooling and heating means for cooling and discoloring the thermochromic layer has not yet been disclosed, and a cold heat medium such as cold water or ice pieces may be applied or a thermochromic object may be put in the refrigerator. , Had to change the color due to the cold air in the refrigerator. Under such circumstances, no effective proposal has been disclosed yet regarding the tip structure of the discoloring tool that transfers the heat or cold of the heating element or the cooling element to the writing tip to effectively function.

[0003]

[Problems to be solved by the device]

 In the conventional electric heating tool, the heating element itself does not have a self-temperature control function, and if it is left as it is, there is a risk of overheating, a temperature control switch, etc. are required, and to avoid the risk of leakage. It was necessary to perform insulation treatment such as coating of the heat-generating part with the above ceramics. Furthermore, the structure of the tip portion that effectively transfers the heat of the heating element to the writing tip and makes it function is not disclosed, and the practical effect has not always been satisfied. Further, even if the conventional cooling means is applicable to a specific place such as a home, it cannot change the color of the thermochromic layer of the object immediately when needed, and it does not change the temperature to a low temperature range. The function of the thermochromic object having the color change point could not be effectively exhibited. Further, the application of the cold heat medium has a limit in the cold heat duration, and it has been troublesome to prepare these media each time. Further, in the case of a non-water resistant thermochromic object, not only the direct contact of the cooling / heating medium but also the indirect contacting operation in which the cooling / heating medium is accommodated in the container and applied. It was apt to change the quality of the target object due to the dew condensation layer, water droplets or water leakage generated on the surface.

The present invention not only has applicability as the tip of the conventional electric heating tool, but also intends to disclose the structure of the tip in a novel heating and cooling color changing tool.

[0005]

[Means for Solving the Problems]

 The tip of the color changing device of the present invention will be described with reference to the drawings. The present invention relates to a thermochromic object having a thermochromic layer, in which a desired thermochromic image is obtained by contacting or writing on the thermochromic layer, the thermochromator has an electric heating element 2 or a Peltier effect. A thermochromic conversion element 3 is used as a heat source or a cold heat source, and a heat transfer tip member 4 is provided in contact with the heat source or the cold heat source to transfer heat or cold heat to the tip, and the heat transfer tip member 4 is a point. A tip portion 41 having a linear, linear or narrow tip end, and a heat transfer base portion 42 extending from the tip portion 41. The tip portion 41 has at least the frontmost portion projected and a holding cylinder. 5, the heat transfer table portion 42 is provided in contact with the electric heating element 2 or the thermoelectric conversion element 3, and the tip portion 1 of the color changing tool is required.

Further, the energization heating element 2 is a resistance heating element having a positive temperature coefficient of electric resistance, and the endothermic side A of the energization heating element 2 or the thermoelectric conversion element 3 is made of a metal material. The heat-conducting tip member 4 is arranged in contact, and under the condition of the ambient temperature of 25 ° C., the heat of 30 ° C. to 70 ° C. or the temperature of 20 ° C. to −15 ° C. is applied by applying the DC voltage of 0.8 V to 50 V. The cold end of the heat transfer tip member 4 is required to be supplied to the front end portion of the color changing tool. The energization heating element 2 in the above is a resistance heating element having a positive temperature coefficient of electric resistance in a temperature range of at least 25 ° C to 70 ° C, and has a volume resistivity (ρ25) at 25 ° C of 9. 8 × 10 ⁻³ Ω · cm to 2.97 × 10 ⁵ Ω · cm, the volume resistivity ratio (ρ70 / ρ25) at 25 ° C. and 70 ° C. is within the range of the following formula 5 ≦ (ρ70 / ρ25) ≦ 400. Of the BaTiO ₃ series sintered body [rare earth], which is composed of a thermistor which satisfies the above requirements and is self-temperature controlled to an arbitrary temperature within the temperature range of 25 ° C to 70 ° C. Element-doped semiconductor that is further replaced by Sr or other element, if necessary, Si single crystal system, organic plastic system (low melting point crystalline plastic is blended with conductive fine powder such as graphite) Stuff) etc. Bets can be, adjustment of heating the saturated temperature at the low temperature range (25 to 70 ° C.), the the plane, such as a Atsushi Nobori characteristics BaTiO ₃ sintered body is effective.

Within the above-mentioned range of at least 25 ° C. to 70 ° C., the temperature coefficient of electric resistance exhibits a positive value, and the resistance value increases steeply with increasing temperature, so that the amount of heat generated rapidly increases. It is reduced, and self-temperature control is possible within the temperature range. Further, when the current-carrying heating element 2 satisfies the volume resistivity range, it is possible to supply a heating element satisfying the heat generation property in the low temperature range (70 ° C. or lower, preferably 50 ° C. or lower) and the self-temperature controllability. Further, in a system in which the heating element is outside the upper limit value at each temperature, for example, in a system with a volume resistivity exceeding the upper limit value line, it is difficult to raise the temperature to the desired temperature range in a short time unless the voltage is increased. In a system with a volume resistivity lower than the lower limit line, the desired heat generation temperature cannot be obtained unless the voltage is made extremely small and a large current is passed, and it is applied in a low temperature range (for example, toy elements, etc.). ) Is not satisfied, but the above properties are satisfied within the above range (see FIG. 7). An electrode can be provided on the energization heating element 2, but it is effective in terms of energization assembly processing. Specifically, the surface facing the energization heating element 2 itself is sprayed with aluminum or plated with nickel, tin, or the like. It can be formed by applying or is provided on the heat conductive tip member 4 arranged in contact with the electric heating element 2.

As the thermoelectric conversion element 3 having the Peltier effect, the one generally used conventionally is effective, and a couple of a deficient electron P-type and an excess electron N-type semiconductor element is alternately formed by metal pieces. It is constructed by uniting the upper and lower surfaces and the lower surface by sandwiching them with a thermally conductive insulating plate such as alumina or ceramic. When an electric current is passed from the N-type terminal to the P-type terminal, the Peltier effect absorbs heat on the upper surface and the lower surface. Fever. Examples of the P-type or N-type semiconductor element described above include Bi ₂ Te ₃ , Bi ₂ Se ₃ , and Sb ₂ Te ₃ . The number of pairs of the semiconductor elements is 1 to 511 pairs, more practically 4 to 127 pairs, and preferably 4 to 31 pairs. The radiator 6 connected to and arranged on the heat generating side B may be, for example, one having a heat radiation fin made of a metal material, one wound with a mesh sheet material made of a metal material, or the like. Further, the radiator 6 may be composed of a heat radiating container and a heat storage medium that is at least filled in the container at the time of use, and the two can work together to effectively exhibit the desired heat radiating function. Although the heat dissipation container does not hinder the application of a thin container made of a plastic material, the surface of the thermoelectric conversion element 3 that contacts the heat generating side B is made of at least a metal material, and the heat storage container is filled with heat. Improves the heat transfer effect to the medium. A metal container made of aluminum, copper, brass, etc. is effective. The heat storage medium is a liquid, and it is effective that it has a relatively low viscosity in terms of the convection effect, and it has a large heat capacity per weight and volume, as well as availability, safety, and cost. Satisfying water is optimum, and an appropriate amount of polyhydric alcohols for imparting antifreezing property, an appropriate amount of a rust preventive agent and the like can be added. Examples of liquids other than water include glycerin, ethyl alcohol, ammonia water and the like. A power supply (not shown) for applying the voltage may be applied by connecting various batteries such as dry batteries or an AC / DC converter to convert AC into DC. A metal material is effective for the heat-conducting tip member 4, and the tip portion 41 and the heat-transfer base portion 42 are usually formed integrally, but not limited to this, they may be formed separately and combined. It may be a small one. The thermochromic layer to which the color-changing tool of the present invention is applied is effective from a practical viewpoint when it has a color-changing point in the range of -15 ° C to + 70 ° C (preferably -5 ° C to + 50 ° C). The thermochromic layer may have various forms such as a sheet, a linear body, and one having an uneven surface, and may be a writing board, a lesson, a learning material, a picture book, various displays, or other toy elements. You can

[0009]

[Action]

 The frontmost part of the heat-conducting tip member 4 functions as a contact point to the thermochromic layer of the thermochromic object or as a writing tip, and gives a desired thermochromic image. Here, in the heat-conducting tip member 4, the tip portion 41 is held at least by the holding cylinder 5, and the frontmost portion is projected and exposed from the front end of the holding cylinder 5, and the heat storage or cool storage portion 42 is inside the holding cylinder 5. However, it is protected and heat is released or cooled from the frontmost part. Continuing contact with the thermochromic layer, especially continuous writing, causes heat loss (temperature drop with hot pen, temperature increase with cold pen), which tends to make it difficult to maintain the desired thermochromic function. The heat storage or cold storage section 42 in the present invention has a larger volume than the tip section 41, effectively develops the heat storage and cold storage effects, and supplies the heat to the frontmost section, while the frontmost section has a dotted or linear shape. Since it has a shape or a narrow width, the contact area with the thermochromic layer is suppressed to the necessary minimum, the heat loss in practical use is suppressed to the necessary minimum, and it contributes to the continuation of the discoloring effect in continuous writing.

[0010]

【Example】

Example 1 A plate piece (tip portion 41) having a height of 18 mm, a width of 20 mm, and a thickness of 4 mm (vertical portion 41) is made by vertically cutting a central portion of a base heating table portion 42 of 20 mm × 20 mm × 2 mm (thickness) made of an aluminum material. The heat-conducting tip member 4 (see FIG. 3) is provided, and its upper end is chamfered into an R shape to form the foremost part. The heat transfer base portion 42 has an electric heating element 2 [BaTiO ₃ system sintered body (15 mmφ × 1 mm thickness, conductive plating layers formed on both sides, resistance value of 2.5Ω (25 ° C.)). A resistance heating element whose heat generation saturation temperature is set to 45 ° C.) is joined to the base plate portion with a conductive adhesive, connected by a lead wire 7, and electrically connected to a power supply battery (not shown). The exothermic element holds a tip portion 41 in a plastic holding cylinder 5, projects the tip thereof, and has a heat transfer base portion 42 in the holding cylinder 5. The holding cylinder 5 is attached to an appropriate supporting shaft. A heating type color changing tool is constructed.

Example 2 An example of applying the heat-conducting tip member 4 of Example 1 to configure the tip portion of a cooling type color changing tool will be described. The tip portion 41 of the heat-conducting tip member 4 is held by the holding cylinder 5 of the first embodiment, and the heat-transfer base portion 42 is placed on the heat-absorption side A of the thermoelectric conversion element 3 (the number of semiconductor pairs: 31 pairs) having the Peltier effect. The heat-dissipating side B of the thermoelectric conversion element 3 is closely arranged, and the bottom portion of the radiator 6 formed by filling water into a heat-dissipating container made of an aluminum barrel (diameter 32 mmΦ × length 10 cm) is closely contacted. And is connected to a 3V power supply battery (not shown) via a lead wire 7 to form a cooling type color changing tool. The cooling discoloration tool 1 was brought into contact with the thermochromic layer at a tip temperature of -5 ° C in the initial stage of energization and continuously written (writing a line width of 20 mm), but the temperature rose to around 5 ° C, but at room temperature, 8 ° C. It was possible to form a continuous thermochromic image on the thermochromic layer with the color change point at the bottom.

[0012]

[Effect of the device]

 The color-changing tool of the present invention is applied in combination with a thermochromic object provided with a thermochromic layer, and the thermochromic layer can be easily discolored by heating or cooling. In the heating type color change tool, the energization heating element can be quickly heated by applying a low voltage to raise the temperature to a predetermined temperature to cause heat discoloration, and the heat generation temperature is in a desired low temperature range. There is no danger due to overheating because it is self-controlled to the saturation temperature. Furthermore, since it is an energized heat generation system that applies a low voltage, there is no danger of leakage, and it is not necessary to coat the heater part to prevent the above danger. Can be made. In the cooling type discoloration tool, the discoloration layer of the object can be cooled and discolored easily at any time and in any place, as compared with the conventional cooling / heating means using cold water, ice chips, etc. as the cooling / heating medium. Satisfies convenience, applicability to non-water resistant objects, portability, etc. Moreover, it can be operated by applying a low voltage, and the function can be made permanent by replacing batteries such as dry batteries. Effective heat transfer of heat from the heat transfer base of the heat transfer tip member 4 or heat from the cold heat source, and the effect of the configuration of the contact surface formed to the minimum necessary for the front end that contacts the thermochromic layer In addition to narrow handwriting, wide handwriting can be effectively obtained with very little heat loss, and the discoloration due to continuous writing is maintained.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional explanatory view of an embodiment of a distal end portion of a color changing tool of the present invention.

FIG. 2 is a vertical cross-sectional view of another embodiment of the distal end portion of the color changing tool of the present invention.

3 is a perspective view of a heat conductive tip member applied to the tip portion of FIG. 1. FIG.

FIG. 4 is a perspective view of another example of the heat conductive tip member.

FIG. 5 is a perspective view of another example of the heat conductive tip member.

6 is a cross-sectional view taken along the line AA of the heat conductive tip member of FIG.

FIG. 7 is a graph showing an allowable range of volume resistivity at each temperature of an electric heating element applied to the present invention.

[Explanation of symbols]

 1 Tip of color change tool 2 Electric heating element 3 Thermoelectric conversion element A Heat absorption side B Heat generation side 4 Heat transfer tip member 41 Tip 42 Heat transfer base 5 Holding tube 6 Radiator 7 Lead wire

Claims (2)

[Scope of utility model registration request] 1. A thermochromic object having a thermochromic layer, in which a desired thermochromic image is obtained by contacting or writing on the thermochromic layer, the thermochromator having an electric heating element or a Peltier effect. In the color-changing tool configured to transfer heat or cold to the tip by providing the conversion element as a heat source or a cold heat source, and disposing a heat conductive tip member in contact with the heat source or the cold heat source, the heat conductive tip member has a dot shape, a line shape. A tip portion having a shape or a narrow tip end and a heat transfer base portion extending from the tip portion, and the tip portion is held in a holding cylinder with at least the tip end protruding, A tip portion of a color changing tool in which a table portion is arranged in contact with the electric heating element or the thermoelectric conversion element. 2. The heat source is a resistance heating element having a positive temperature coefficient of electric resistance, the cold heat source is a thermoelectric conversion element having a Peltier effect, and the resistance heating element or the thermoelectric conversion element has a heat absorbing side. , A heat-conducting tip member made of a metal material is arranged in contact, and 0.8
The color change tool according to claim 1, wherein heat of 30 ° C. to 70 ° C. or cold heat of 20 ° C. to −15 ° C. can be supplied to the frontmost portion of the heat conductive tip member by applying a DC voltage of V to 50 V. Tip.