JPS59164159A - Thermal head - Google Patents

Abstract

PURPOSE:To enable the shortening of a recording time, by constituting a thermal head by providing a preheating resistor, which can perform heating independently of the recording resistor provided on a substrate, in the vicinity of said recording resistor. CONSTITUTION:Transfer paper 10 coated with transfer ink is pressed to recording paper 9 by a thermal head 14 consisting of a drum 8 around which the recording paper 9 is wound and constitutional elements 1-7, 12, 13 and the transfer paper 10 and the recording paper 9 heated to a temp. in the vicinity of a recording temp. by a preheating resistor 12 are revolved to the direction shown by the arrow 15 by the drum 8 to move to a recording heat generating body 3. When a recording signal is selectively supplied to the heat generating body 3 in this state, only the signal supplied heat generating body 3 generates heat and the transfer ink which is applied to the transfer paper and heated to the temp. in the vicinity of the recording temp. is instantaneously transferred and recorded on the recording paper.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a thermal head for a thermal printer using thermal paper, transfer paper, or the like.

Conventional Structures and Problems In recent years, heat-sensitive or transfer-type thermal printers using thermal heads have been attracting attention as output terminals for facsimile, computer graphics, and IX. A conventional semi-transfer type thermal printer will be explained below as an example.

1 to 3 show a conventional transfer type thermal printer, in which FIG. 1 is a sectional side view, FIG. 2 is a plan view, and FIG. 3 is a front view.

1 is a thermally good conductive substrate, 2 (I'j: the other end formed on its surface is connected to a recording control electrode 6; 6 is an oxidation preventive plate that covers the recording resistor 3, the input electrode 4, and the recording control electrode 5); 7 is a wear film formed on the surface of the film; 8 is a drum around which recording paper 9 is wound; 10-: transfer paper coated with transferable ink that comes into close contact with recording paper 9 by thermal head 11 and drum 8; It is.

The operation of a conventional thermal printer configured as described in Section 2 will be explained below.The thermal printer 11 consisting of the components 1 to 2 and the drum 8 which wraps the entire recording paper 9 are used to print the recording paper 9 and the transfer paper 1°. pressure weld. Recording resistors 3 are lined up in a line at the pressure contact portion of the thermal head 11.
By energizing the recording control electrode 6 in response to a recording signal, each recording resistor generates heat appropriately, and the transferable ink applied to the transfer paper 10 is transferred to the recording paper 9. The recording characteristics of a recording method using heat application, such as transfer paper or thermal paper, will be explained with reference to FIG. FIG. 4 shows the recording characteristics, with the horizontal axis representing recording temperature (T) and the vertical axis representing recording density (D), and the characteristics roughly represent an S-shaped curve.

The conventional transfer type thermal printer mentioned above operates at room temperature (To
) Since a time (t-t) was required to raise the temperature of the recording resistor 3 from the state to the recording temperature range (ΔT), the heating time (tx) was added to the actual recording time. However, this method has the disadvantage that the recording time becomes longer and the transfer time becomes longer.

OBJECTS OF THE INVENTION The present invention has been made to solve the above-mentioned conventional drawbacks, and an object of the present invention is to provide a thermal head that shortens the recording time by effectively utilizing the heat generated by the recording resistor only for recording. ing.

Components of the Invention The present invention is a single head equipped with a preheating resistor in the vicinity of a recording resistor, and the preheating resistor can control heat generation separately from the recording resistor to heat sensitive paper or transfer during recording. By heating the paper at a temperature near the recording temperature 1, the recording time can be shortened.

DESCRIPTION OF EMBODIMENTS A description will be given below of an example of a transfer type thermal printer using a thermal head according to an embodiment of the present invention.

6 and 7 show a transfer type thermal printer using a thermal head according to the present invention, in which FIG. 6 is a sectional side view, FIG. 6 is a plan view, and FIG. 7 is a front view. Figure 6~
In FIG. 7, numerals 1 to 10 are the same as those in FIGS. 1 to 3, and their explanation will be omitted.

The difference from those in FIGS. 1 to 3 is that a preheating resistor 12 and a preheating control electrode 13 are provided near the recording resistor 3 and for controlling the preheating resistor.

Note that one end of the preheating resistor 12 is connected to the input electrode 4, and the other end is connected to the preheating control electrode 13. The thermal head in this embodiment is designated as 14.

The operation of the transfer type thermal printer of this embodiment configured as described above will be explained below.

The basic operation is the same as that of the conventional example, so a detailed explanation will be omitted. The difference from the conventional example is that a preheating heating element 12 is provided in the vicinity of the recording heating element 3, and that the preheating heating element 12 can be preheated independently by a preheating cap [+'+1 electrode 13].

A drum 8 wound with recording paper 9, and components 1 to 1
2. The transfer paper 10 coated with transferable ink is brought into pressure contact with the recording paper by the thermal head 14 consisting of a thermal head 14, and the transfer paper 10 and the recording paper 9, which have been heated to near the recording temperature by the preheating resistor 12, are moved by the drum 8 in the direction of the arrow 16. It is rotated and moved to the recording heating element 3. When recording copies are selectively supplied to the recording heating element 3 in this state, only the supplied recording heating element 3 generates heat, and the transferable ink coated on the transfer paper heated to near the recording temperature It is instantly transferred and recorded on recording paper. That is, according to this δ embodiment, the heating time (tx) shown in FIG. 4 is not necessary, so that the transfer speed can be increased. Further, since the preheating resistor 12 can be thermally controlled separately from the recording resistor 3, the preheating resistor 12 is not affected by the recording control electrode 5, so uniform preheating is always possible. By using a thin film resistor as the preheating resistor, integrated manufacturing is easily possible when manufacturing the thermal head. Furthermore, since preheating is performed only on the portion of the transfer paper immediately before recording, transfer recording is completed before thermal deterioration of the transfer ink occurs (if kept near the recording temperature for a long time, the ink deteriorates due to thermal oxidation, etc.).

Although not mentioned in the above description of the configuration, it is a known means to control the temperature of the preheating resistor 12 by incorporating a conventional temperature detection element in the thermal head 11. Therefore, the explanation of the configuration has been omitted. Although the preheating resistor 12 is made of a thin film resistor, it goes without saying that a similar resistor, for example a thick film resistor, may be used.

Effects of the Invention As described above, since the thermal head of the present invention is provided with a preheating resistor, the "I" required for recording is reduced.
can be shortened and faster recording can be achieved.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional side view of the main parts of a thermal printer using a conventional thermal head, Figure 2 is a cross-sectional view of the same, Figure 3 is a front view of the same, and Figure 4 is a front view of the same. 6 is a cross-sectional side view of the main parts of a thermal printer using a thermal head according to an embodiment of the present invention, FIG. 6 is a plan view of the same, and FIG. 7 is a front view of the same. be. 3...Recording resistor, 4...Manual electrode, 5...
- Control electrode, 12... Preheating resistor, 13... Preheating control electrode, 14... Thermal head. Name of agent: Toshio Nakao, Physician, and 1 other person Figure 4 IQ
-Ichiya Figure 5 Figure 6N Figure 7

Claims (1)

[Claims] A thermal head that includes a recording resistor provided on a substrate, and a preheating resistor that can be heated independently of the recording resistor in the vicinity of the recording resistor.