JP6052682B2 - Heating device for thermochromic ink. - Google Patents

Description

  The present invention relates to a heating device for decoloring or discoloring a writing instrument using a thermochromic ink that becomes transparent or changes color by heat.

  Conventionally, writing instruments using thermochromic inks using pigments or dyes that change color when heated are known, and images and handwriting written on paper using such thermochromic inks can be generated by frictional heat or electric power. It is already known from Patent Document 1 and Patent Document 2 that the color is erased or discolored by the heat generated by the heater.

  In Patent Document 1, the friction body 12 is rotated at high speed by a small motor, and the description (image or handwriting) of the thermochromic ink formed on the paper surface is decolored or discolored by frictional heat with the paper surface. Have been described. However, by rubbing the surface of the paper in this way, for example, when characters written with a pencil, ballpoint pen, ink jet printer, etc. and overwritten with a color-changing ink are erased for correction, Colors such as pole pens or printed letters and images are blurred and the paper surface is often stained black.

  Patent Document 2 describes that the electric heater wire 2 such as a nichrome wire is bent and used. However, the nichrome wire has a risk of thermal runaway, and the capacity and use of the battery to be used are limited. It seems difficult to put it to practical use due to safety and strength issues.

JP 2011-42151 A Registered Utility Model Publication No. 3161302

  The present invention is a heating device for decoloring thermochromic ink that can freely select the size and shape of the heating part with a safe and sufficient mechanical strength and low power without using frictional heat or an electric heater, that is, An object is to provide an electronic eraser that erases the handwriting of a writing instrument using thermochromic ink.

  The present invention relates to a thermistor used as a fuse element instead of a conventional electric heater wire such as a nichrome wire as a heating element of a heating device for heating ink described with a writing instrument using the thermochromic ink. The main feature is the use of a type of polyswitch (registered trademark). In other words, the polyswitch used in the present invention is a thermistor using a conductive polymer used as a resettable fuse, which generates heat due to overcurrent, interrupts the current with a high resistance (trip state), It has the characteristic of maintaining a high temperature and high resistance state.

In the present invention, by using the heat generated in the trip state of the polyswitch as a heating device for erasing or changing the color of the thermochromic ink, it is possible to obtain a safe, low power, and energy-saving simple ink erasing. .

  According to the present invention, since the heat generated in the trip state of the polyswitch is used for erasing or discoloring the thermochromic ink, it is safer and consumes less power than an electric heater or motor, and is a light and small heating element. Since an existing standard product may be used, a small and lightweight electronic eraser can be obtained that has a simple configuration and less difficulty in counting than those using an electric heater or motor.

  Further, there is no risk of blurring or blurring of overwritten draft characters as compared with conventional ink erasing using frictional heat. Moreover, since the polyswitch itself can be used by embedding it in the tip cover of a pencil-type heating device, it has the same strength as conventional ink erasing using frictional heat. If the battery runs out, the thermochromic ink remains as it is. By rubbing the surface of the paper described in (1), it has a multifunctional synergistic effect that the handwriting can be decolored or discolored by frictional heat.

  Furthermore, because of the use of the poly switch, even if the power switch of the heating device is forgotten to be turned off, a fine current is flowing, but the switch of the power battery is substantially cut off. Compared with the conventional battery used in the above, the battery can be prevented from being consumed, and has a significant energy saving effect.

It is explanatory drawing which shows the Example of this invention, (a) is a top view, (b) is AA sectional drawing.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, members, parts, and configurations having the same functions may be given the same reference numerals, or descriptions thereof may be omitted.

  FIG. 1 shows an embodiment of the present invention. The heating device is a pencil-type heating device with a built-in power source in which a heating element and a power source are integrally assembled to a power supply case.

  Referring to the figure, 1 is a heating device and 2 is a power supply case. A heating element holding member 3 is inserted and fixed at the open end of the power supply case 2 to constitute a pencil-type heating device. In this embodiment, the heating element holding member 3 is screwed to the front end portion of the power supply case 2, but known and conventional fixing means can be used as necessary.

In the heating device of the present invention, the power supply case 2 uses two 1.5V AAA batteries in series as the power battery E, but the type, shape, and arrangement of the battery are those of a polyswitch described later. This is a design matter that can be arbitrarily selected according to the power used, the object of the heating apparatus to which the present invention is applied, and the purpose of use , and is not necessarily used only for the thermochromic ink.

  On the (−) side of the battery E, a conductive spring 10 is provided for electrode connection, and a conductive rod 8 is electrically connected to the spring 10. P is a push button switch. The conductive rod 8 is electrically discontinuously connected to the conductive rod 9 via the push button switch P, and is configured to be electrically turned on and off by the operation of the push button switch P.

  The heating element holding member 3 is provided with a heating element 5 that is covered with or embedded in the leading edge cover 7 made of a heat-resistant friction member at the distal end of the heating element holding member 3. A poly switch which is a fuse element is used. A male screw is provided on the outer periphery of the rear end portion of the heating element holding member 3 and is configured to be screwed onto the female screw on the power supply case side. Further, the conductive plate 6 for the (+) side connection contact of the battery E and the electrode plate ring 4 are provided on the rear end surface of the heating element holding member 3, and the conductive plate 6 is a lead of the polyswitch which is the heating element 5. One of the wires 5 a is connected, and the other lead wire 5 b of the polyswitch is connected to the electrode plate ring 4.

  Therefore, by screwing the heating element holding member 3 into the power supply case 2, the conductive plate 6 comes into contact with the (+) terminal of the battery, the electrode plate ring 4 comes into contact with the conductive rod 9, and the push button switch P is pushed down. As a result, the rods 9 and 8 are electrically connected to each other, and the polyswitch which is the heating element 5 can be energized.

  Since the heating element 5 uses the poly switch as described above, when the push button switch P is pressed, current is supplied to the poly switch, and when the predetermined trip temperature is reached, the resistance value suddenly increases and the current from the power source battery is increased. Although the electric current is almost cut off, the high temperature state continues as long as the push button switch P is not turned off. During this time, when the tip cover 7 of the heating device is brought into contact with the image or handwriting visualized with the thermochromic ink, the ink Can be erased or discolored.

The polyswitch 5 is preferably selected to trip within a range of about 50 ° C. to 90 ° C. when a 3V to 6V power supply battery is used, and the tip cover 7 uses a heat-resistant friction member made of synthetic resin. Thus, it is preferable to protect the tip of the heating element and to have a shape and size suitable for decoloring or discoloring of the applied image or handwriting.
In addition, by using a material with high heat transfer coefficient using metal or ceramic for the cover 7 at the tip, it is convenient to correct a small line according to the shape of the tip cover 7 or quickly discolor a wide range. Sex can also be added.

The poly switch will flow a small amount of current once it has tripped, but it will remain at a high temperature and shut off unless it is reset. There is expected. In addition, when the power battery is depleted, if there is no draft or there is no risk of the draft characters bleeding, the tip portion may be rubbed against the paper surface and the surface may be erased by the frictional heat of the synthetic resin and the paper surface. It may be embedded in the tip cover as possible .

  It is also possible to use it as a writing instrument for writing notes on thermal paper that has been printed out, or for temporarily fixing a thermal adhesive tape or iron transfer paper.

In the embodiment of FIG. 1 has been described in example using conventional batteries to the power supply battery, use the power from the USB terminal of the external power supply and computer of a plurality of buttons batteries and solar panels, or lead to a power supply By doing so, it is possible to obtain an electronic eraser of handwriting by a writing instrument using a further small and light thermochromic ink.

DESCRIPTION OF SYMBOLS 1 ... Heating device 2 ... Power supply case 3 ... Heat generating body holding member 4 ... Electrode plate ring 5 ... Heat generating body 6 ... Conductive plate 7 ... Tip cover 8 ... Conductive Rod 9 ... Conductive rod 10 ... Spring P ... Push button switch E ... Power supply battery

Claims (1)

  In a heating device for thermochromic ink having a power supply device, a switch, and a polymer semiconductor fuse element having a resettable positive temperature coefficient, the tip of the semiconductor fuse element is covered with a tip cover made of a heat-resistant friction member. Alternatively, the heating device is embedded in the tip cover.

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