JPS5836973Y2 - thermal recording pen - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a thermal recording pen for directly thermally recording an analog signal on thermal recording paper used in a recorder or the like.

In recent recorders, a recording system using a thermal pen has become widely used instead of an ink system. For example, as shown in Fig. A heat insulating layer 2 is formed by covering the heat insulating material, and a heating element 5 is formed on the top surface of the heat insulating layer 2 by a heat generating material such as a nichrome wire, a thin film, a thick film, or a heat generating diode together with the lead wires 3 and 4. The wear-resistant layer 6 is covered with a heat-resistant protective coating made of glass or the like.

Although not shown, the heat-sensitive recording pen having such a configuration is heated by supplying electric power through the lead wires 3 and 4 while being brought into contact with the upper surface of the running heat-sensitive recording paper, thereby producing color recording on the heat-sensitive recording paper. In this case, in order to improve the abrasion resistance of thermal recording paper, it has recently been used as an abrasion resistant layer.
For example, Al2O3 such as sapphire and ruby in glass material
However, these heat-sensitive recording pens have abrasion resistance of up to 500 km when the pen pressure of the heat-sensitive recording pen is 20 g. It could only withstand a length of drawing.

In addition, due to changes in the movement of the heating element, the heat distribution tends to widen and the periphery tends to blur, resulting in uneven drawing.Furthermore, the thermal conductivity is relatively low; for example, sapphire, ruby, etc. Even when mixed with Al2O3-based crystal powder, its thermal conductivity is 0.0016 to 0.0034.
cal /cm2sec°C, but as a result, the thermal response during heating and cooling tended to deteriorate.

The present invention aims to further improve the performance of such conventional thermal recording pens, and provides a thermal recording pen with high wear resistance and high thermal responsiveness.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a cross-sectional view of the main part of the tip of the thermal recording pen according to the present invention, in which 11 is a thermal pen tip base material made of ceramic or the like, and 13 and 14 are lead wires attached to the thermal pen tip base material 11. Connection lines 13' and 14' are electrically connected to each other, and the other side of each connection line 13, 14 is connected to an electrode section 17.14 attached to the heating element 15, as shown in the enlarged view of FIG. As shown in the enlarged views of FIGS. 3 and 4, the heating elements 15 connected to the respective terminals 18 are cylindrical IIa having a diameter of about 0.1 to 0.5 mm, for example, according to the present invention. A type of diamond 19 is coated around it by vapor deposition or printing, and the state of the coating is I.
It is formed from a position lower than the tip of the Ia type diamond 19.

Each electrode part of 17.18 is connected to the connecting wire 13°14 as mentioned above.
2 is connected, and 16 in FIG. 2 is a wear-resistant layer as a heat-resistant protective coating made of glass or the like.
The a-type diamond 19 is directly fixed to the thermal pendant base material 11 so that the surface thereof is exposed at least more than the surface of the wear-resistant layer 16.

Therefore, the present invention does not require a heat insulating layer made of a heat insulating material.

In the present invention, the shape of the IIa type diamond 19 is cylindrical in the embodiment, but other shapes may be used.

In this way, type IIa diamond with high thermal conductivity was used for the pen tip, and the heating element was formed by contacting this type IIa diamond, so the thermal time constant of the temperature of the heating element (= heat capacity x thermal resistance ) can be dramatically reduced.

Therefore, for example, when controlling the power supplied to the heating element according to the pen speed, it is possible to better control changes in pen speed that are much faster than with conventional thermal recording pens, which has the advantage of being able to draw a constant trace over a wide range. be.

The thermal recording pen of the present invention having the above-mentioned configuration is capable of supplying power through the lead wires 13 and 14 while touching the top surface of the thermal recording paper installed in the recorder when feeding the thermal recording paper (not shown) installed in the recorder. In this case, since the type IIa diamond 19 is fixed almost at the center of the wear-resistant layer 16 where the contact density is highest, for example, the pen pressure of the thermal recording pen is set to 20°.
g, it has become possible to expand the drawable range from the conventional maximum of about 500 km to a maximum of about 200 km, and the thermal conductivity has also improved from the conventional 00 km.
0016～0.0034 cal/cm2sec'
C level was improved to 3 to 5 Cal/cm2SeC°C.

Incidentally, the IIa type diamond 19 according to the present invention uses a IIa type diamond having particularly high thermal conductivity (for example, 5 to 10 times the thermal conductivity of copper).

Next, in the present invention, when the heat-sensitive recording pen is used continuously, the heat is distributed almost evenly around the relatively small area of the IIa type diamond 19, so there is no so-called blurring phenomenon. It has been confirmed as a result of experiments that no change in drawing performance occurs no matter which direction the heating element 15 moves in the XY (or forward or backward) direction.

The heat-sensitive recording pen of the present invention, which has the above-mentioned structure and function, has improved wear resistance and long life by using IIa type diamond, which has high thermal conductivity, for the wear-resistant layer. It has practical effects such as not only good drawing properties due to lack of directionality but also improved thermal response during heating and cooling.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the main part of the tip of the tip base material of a conventional thermal recording pen, FIG. 2 is a sectional view of the main part of the tip of the tip base of the thermal recording pen according to the present invention, and FIG. IIa in the figure
FIG. 4 is an enlarged side view of the diamond portion of the type, and is also a plan view. 1.11...Base material of thermal pendant, 13.14
...Connection wire, 13', 14'...Lead wire, 5,15...Heating element, 6゜16...
... Wear-resistant layer, 17.18 ... Electrode part, 19
・・・・・・II A type diamond.

Claims (1)

[Scope of utility model registration request] A heating element is formed by depositing or printing an exothermic material around the IIa type diamond, and the IIa type diamond is directly applied to the approximately central portion of the tip of the thermal pliers base material by at least one heat resistant material. Said IIa
A heat-sensitive recording pen characterized by a type of diamond that is fixed so that its surface is exposed to form a wear-resistant layer.