JPH0570976U - Discoloration tool - Google Patents

Abstract

(57) [Abstract] [Purpose] To reduce the frictional resistance during writing, to obtain a smooth writing feeling, and to reduce the abrasion, damage, deterioration and the like of the thermochromic object and the color changing tool. [Structure] The heat conductive seat member 3 rotatably holds the heat conductive balls 4. The seat member 3 is in contact with the heat source 5 or the cold heat source 6 and supplies heat or cold heat to the balls 4 by heat conduction.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a color changing tool. More specifically, the present invention relates to a writing instrument-type color changing tool which is written on a thermochromic layer of a thermochromic object to obtain a desired thermochromic image.

[0002]

[Prior Art]

 Heretofore, various means have been proposed as means for changing the color of the thermochromic layer of a thermochromic object having a thermochromic layer that changes color due to temperature change. For example, Japanese Utility Model Application Laid-Open No. 2-130386 discloses a heating pen having a resistance heating element as a writing tip.

[0003]

[Problems to be solved by the device]

 The conventional discoloration tool has a large frictional resistance at the contact point between the discoloration tool and the thermochromic object, and it is difficult to obtain a smooth writing feeling. It was

The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a discoloring tool that is less likely to cause a smooth writing feeling and damage or deterioration of the thermochromic layer.

[0005]

[Means for Solving the Problems]

 The color-changing tool 1 according to the present invention is a color-changing tool that obtains a desired thermo-color-change image 82 by writing on the thermo-color-change object 8 having the thermo-color-change layer 81. The ball 4 and the heat conductive seat member 3 that contacts the heat source 5 or the cold heat source 6 and rotatably holds the heat conductive balls 4 are provided. Further, in the discoloring tool 1, the heat source 5 is It is a requirement that the resistance heating element 51 has a positive temperature coefficient of electric resistance and the cold heat source 6 is a thermoelectric conversion element 61 having a Peltier effect.

As the material of the ball 4 and the seat member 3, a heat conductive material is adopted. For example, metal (aluminum, iron, stainless steel, copper, brass, other various alloys, etc.), ceramic, crystal, Quartz glass and the like are effective, but are not limited to these.

The seat member 3 has a seat 31 and a contact portion 35 for contacting the heat source 5 or the cold heat source 6, and is formed integrally or by a combination of a plurality of members. It is sufficient for the receiving seat 31 to be capable of holding the ball 4 rotatably at the time of writing, and it is effective to have a spherical or tapered concave portion as a shape, and to hold the ball 4 in order to prevent the ball 4 from falling off. The cover member 33 to be held may be integrally extended or attached separately. The contact portion 35 may be provided at any position as long as it can effectively supply heat or cold heat to the ball 4, and is formed at an appropriate position of the seat member 3. Further, in order to fix the heat source 5 or the cold heat source 6 to the seat member 3, it is possible to interpose a separate member having heat conductivity between the seat member 3 and the heat source 5 or the cold heat source 6.

Examples of the heat source 5 include a heat medium such as hot water contained in a container 21, and a resistance heating element 51 such as a nichrome heater or a ceramic heater.

Particularly, in consideration of safety, the resistance heating element 51 is preferably a resistance heating element having a positive temperature coefficient of electric resistance having a self-temperature control function, and a heating saturation temperature of 25. A BaTiO ₃ based sintered body or the like constituted by a thermistor whose temperature is controlled to an arbitrary temperature within the temperature range of 70 ° C to 70 ° C is effective.

Examples of the cold heat source 6 include a cold heat medium such as ice pieces housed in a container 21, and a thermoelectric conversion element 61 having a Peltier effect.

Particularly, as the thermoelectric conversion element 61, a general-purpose one has been effective from the past, and a couple consisting of a deficient electron P-type semiconductor and an excess electron N-type semiconductor element is alternately joined by metal pieces, and It has a structure in which the lower surface is sandwiched between thermally conductive insulating plates such as alumina and ceramics to form a unit. When a current is passed from the N-type terminal to the P-type terminal, the upper surface absorbs heat and the lower surface generates heat. Further, the P-type or N-type semiconductor element can be exemplified by Bi ₂ Te ₃ , Bi ₂ Se ₃ , Sb ₂ Te _3, etc., and the number of pairs of the semiconductor element is 1 to 511 pairs, more practically 4 to 5 pairs. 127 pairs, preferably 4 to 31 pairs of systems are effective. The thermoelectric conversion element 61 is arranged such that, under an environment temperature of 25 ° C., a cold voltage of −15 ° C. to + 20 ° C. can be supplied to the exposed end portion of the ball 4 by applying a DC voltage of 0.2 V to 50 V. ..

The thermochromic layer 81 to which the discoloring tool 1 of the present invention is applied is effective from a practical point of view, having a discoloration point in the range of -15 ° C to + 70 ° C (preferably -5 ° C to + 50 ° C). Is. Further, the thermochromic layer 81 may be in various forms such as a sheet, a linear body, or one having an uneven surface, and may be a writing board, a lesson, a learning book, a picture book, various display bodies, or other toy elements. be able to.

[0013]

[Action]

 Since the heat-conducting ball 4 rotates while contacting the heat-conducting seat member 3, friction resistance can be reduced and writing can be performed smoothly, and heat can be transferred from the heat source 5 or the cold heat source 6 by heat conduction through the seat member 3. Alternatively, cold heat can be rapidly supplied to the exposed end portion of the ball 4, and the rotation of the ball 4 can stabilize the temperature distribution of the entire ball 4 uniformly. In particular, even if the exposed end of the ball 4 comes into contact with the thermochromic layer 81 and heat loss (temperature drop when the heat source 5 is applied, temperature rise when the cold heat source 6 is applied) occurs, the ball from the seat member 3 quickly A supply of heat or cold is obtained and continuous writing is possible.

[0014]

【Example】

 Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory view of a usage state of the color changing tool 1 of the present invention. The tip of the color-changing tool 1 is brought into contact with the thermo-color-changing layer 81 of the thermo-color-changing object 8 so that the thermo-color-changing image 82 appears on the thermo-color-changing layer 81.

FIG. 2 shows a first embodiment of the color changing tool 1 of the present invention. At the tip of the main body 2, a metal ball 4 is rotatably held by a seat 31 of a metal seat member 3. The seat member 3 has a hemispherical seat 31 at the front end and a flat base 32 as a contact portion 35 at the rear end. Further, the ball 4 is held by the seat 31 by the cover member 33, and at the same time, the seat member 3 is fixed to the tip of the main body 2. A resistance heating element 51 is used as the heat source 5. The resistance heating element 51 is a BaTiO ₃ system sintered body, is joined to the base 32 at the rear end of the seat member 3 with a conductive adhesive, and is housed in the main body 2 by the lead wire 71. 7 is connected so that it can be energized.

FIG. 3 shows a second embodiment of the color changing tool 1 of the present invention. The seat member 3 is made of metal, and has a hemispherical seat 31 at the front end and a flat plate base 32 at the rear end, as in the first embodiment. The receiving seat 31 holds the metal ball 4, and a cover member 33 is externally fitted to the cylindrical portion of the receiving seat 31 so that the ball 4 is rotatably held. As the cold heat source 6, a thermoelectric conversion element 61 having a Peltier effect is adopted. The heat absorption side of the thermoelectric conversion element 61 is in close contact with the flat plate-shaped base portion 32 of the seat member 3, and the heat generation side of the thermoelectric conversion element 61 is the heat dissipation container 62 made of aluminum containing water therein. Close to the bottom. The seat member 3 and the heat dissipation container 62 are fixed by a mounting member 34, and the thermoelectric conversion element 61 is sandwiched between them. The thermoelectric conversion element 61 is connected to a 3V power supply battery 7 (not shown) via a lead wire 71.

FIG. 4 shows a third embodiment of the color changing tool 1 of the present invention. The seat member 3 has a tapered seat 31 formed at the front part thereof, and after the ball 4 is inserted, the rim of the seat 31 is plastically deformed inward to rotatably hold the ball 4. To do. The seat member 3 holding the ball 4 has a rear end pedestal 32 tightly fitted in the opening of the plastic container 21, and is in direct contact with the heat medium housed in the container 21. In the drawing, the ice pieces 63 are housed in the container 21 to serve as the cold heat source 6, but hot water may be housed to serve as the heat source 5.

[0018]

[Effect of the device]

 Since the tip of the color-changing tool is configured so that the ball is rotatably held by the seat member, it is possible to reduce the frictional resistance between the thermochromic object and the tip during writing, thus providing a smooth writing feeling. At the same time, it is possible to reduce wear, damage, deterioration and the like of the thermochromic object and the tip of the color changing tool. Further, the heat transfer action of the seat member and the ball and the rotating action of the ball are combined to speed up the supply of heat or cold heat to the exposed portion of the tip of the ball, and the stroke loss due to heat loss at the exposed portion of the ball. Continuous writing is possible without generating handwriting blur.

[Brief description of drawings]

FIG. 1 is a perspective view showing a use state of a color changing tool of the present invention.

FIG. 2 is a vertical sectional view showing a first embodiment of the color changing tool of the present invention.

FIG. 3 is a vertical cross-sectional view showing a second embodiment of the color changing tool of the present invention.

FIG. 4 is a vertical sectional view showing a third embodiment of the color changing tool of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Color change tool 2 Main body 21 Container 3 Seat member 31 Seat 32 Stand part 33 Cover member 34 Mounting member 35 Contact part 4 Ball 5 Heat source 51 Resistance heating element 6 Cold heat source 61 Thermoelectric conversion element 62 Radiating container 63 Ice piece 7 Power battery 71 lead wire 8 thermochromic object 81 thermochromic layer 82 thermochromic image

Claims (2)

[Scope of utility model registration request] 1. A color-changing tool for writing on a thermo-color-changing layer of a thermo-color-changing target object to obtain a desired thermo-color-changing image, wherein a part of the heat-conducting ball 4 exposed at the tip of the main body 2 and a heat source 5 or cold heat. A color-changing tool 1 characterized in that a heat-conducting seat member 3 that contacts the source 6 and holds the heat-conducting balls 4 rotatably is provided. 2. The color changing tool 1 according to claim 1, wherein the heat source 5 is a resistance heating element 51 having a positive temperature coefficient of electric resistance, and the cold heat source 6 is a thermoelectric conversion element 61 having a Peltier effect.