JPH0140010Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is a thermal pen used in a thermal recorder.
Especially regarding the stick-shaped thermal pen.

[Conventional technology]

A conventional rod-shaped thermal pen is described in Japanese Utility Model Publication No. 57-6972. This is an improvement over the previously unsatisfactory points of this type of rod-shaped hot pens in terms of structure, lifespan, power consumption, and heat tracking speed due to the use of heating elements such as nichrome wire. be.

This improved rod-shaped thermal pen has a structure in which a heating element is formed by thin film or thick film technology on an alumina substrate or a steatite substrate in the portion that contacts the heating paper, and is attached to the tip of the holder. In this way, the drawbacks of hot rod pens that use nichrome wire are overcome.

[Problem that the invention attempts to solve]

However, the above-mentioned rod-shaped thermal pen has a relatively complicated configuration, such as forming a heating element on the board and processing lead wires for supplying power to the heating element, which is inconvenient in terms of manufacturing and increases costs. There were some flaws that stood out.

This invention was made to eliminate these drawbacks.

[Means for solving problems]

In order to achieve this purpose, the present invention has a heating element formed in a columnar shape and having electrodes connectable to a conductor supplying electric power at both ends thereof, and a heating element that is in direct contact with thermal paper. A hollow pipe forming a holder made of a conductive material with a predetermined portion cut out and the tip of which is electrically connected to an electrode provided at the tip of the heating element, and a hollow pipe formed at the other end of the heating element passing through the hollow pipe. The lead wire and the hollow pipe are insulated from each other.

[Effect]

With such a configuration, the heat tracking speed is improved by supplying power to the heating element.
Moreover, since the structure is simple, manufacturing is easy.

〔Example〕

FIG. 1 is a block diagram of the main parts of a recorder using the rod-shaped thermal pen of the present invention, and FIG. 2 is a block diagram of the main parts of the stick-shaped thermal pen. In FIGS. 1 and 2, 1 is a thermal pen holder, 2 is a galvanometer, and 3 is thermal paper.

The thermal pen holder 1 is attached to a rotating shaft 21 of a galvanometer 2 via a mounting fitting 22. At this time, a heating element 11 is attached to the opposite end of the thermal pen holder 1. The heating element 11 has electrodes 111 at both ends thereof for supplying electric power, as shown in FIG. 2a.
and 112 are formed by, for example, nickel plating. Furthermore, the thermal pen holder 1 is configured as a hollow pipe made of a conductive material such as aluminum, and has a notch 14 formed at its tip so that the heating element 11 is exposed and comes into direct contact with the thermal paper 3. In this embodiment, a hollow pipe forming the thermal pen holder 1 is used as a conductor for supplying power to the heating element 11. One lead wire 13 is soldered to the rear end of the hollow pipe, that is, the thermal pen holder 1, and the connection between the tip of the hollow pipe 1 and one electrode 111 of the heating element 11 is formed by conductive adhesive or soldering. ing. The other electrode 1 of the heating element 11
A lead wire 12 is soldered to 12, and this lead wire 12 passes through the hollow pipe 1 and exits from the outlet 15. Although not shown, the lead wires 12 and 13 are connected to a power source. As a result, a circuit for heating the heating element 11 is formed. Note that the hollow pipe 1 and the other electrode of the heating element 11 and the lead wire 12 connected thereto are insulated from each other.
The hollow pipe shown in Figure 2b is another embodiment of the thermal pen holder 1, but its operation is similar.

Although the material of the heating element 11 is not particularly specified in the embodiment of the present invention, it is convenient to use SiC (silicon carbide) as the heating element 11, for example. By using SiC for the heating element 11, 1. The heat tracking speed (temperature time limit) of the heating element is proportional to the product of its heat capacity (v x d x c) and thermal resistance (L/S x λ). If the shape (V, L, S) of the heating element is constant, the time limit of the heating element is proportional to τ=cd/λ.

Here, c: specific heat, d: density, and λ: thermal conductivity, which are properties specific to the material.

V, L, and S are the volume and length of the heating element, respectively.
It is the cross-sectional area. From the above, the smaller the τ of the material used for the heating element, the better. Sic has a smaller τ than other substances. Accordingly, compared to Nichrome's 13.3,
Its value is 3.2, which is less than 1/4. Therefore, a pen with good heat followability can be manufactured.

2 SiC is very hard and therefore resistant to natural abrasion and can be used in direct contact with recording paper.

3. The general operating temperature of SIC is 1200°C to 1400°C. When used as a pen, it has a sufficient overload safety factor at about 100℃ to 300℃.

[Effect of idea]

As described above, according to the present invention, it is possible to obtain a rod-shaped thermal pen that is simple in structure, easy to manufacture, and inexpensive.

[Brief explanation of drawings]

FIGS. 1 and 2 are explanatory diagrams showing an embodiment of the present invention. 1... Heat pen holder, 2... Galvanometer,
3...Thermal paper.

Claims (1)

[Claims for Utility Model Registration] (1) A heating element formed in the shape of a column and having electrodes formed at both ends thereof, and a hollow pipe made of a conductive material, the said hollow pipe being A cutout is formed at the tip of the heating element so that when the heating element is held, the held heating element comes into direct contact with the thermal paper, and a notch is formed at the tip of the held heating element. The electrode and the tip of the hollow pipe are electrically bonded together, and a lead wire passing through the hollow pipe is connected to the other electrode formed at the other end of the held heating element, and
the other electrode of the held heating element, a holder in which the lead wire and the hollow pipe are insulated from each other; and a lead wire connected to the holder; A rod-shaped hot pen with a lead wire connected to an electrode and a lead wire connected to the holder mentioned above connected to a power source. (2) The rod-shaped thermal pen according to claim 1, wherein the heating element is made of silicon carbide SiC.