JPH05131659A - Both-sided recording medium and both-sided recording method recording thereon - Google Patents

Abstract

PURPOSE:To provide a thermosensitive both-sided recording medium which can record on front and rear both sides and a both-sided recording method which records thereon. CONSTITUTION:A both recording medium 10 is constructed by applying a first heat sensitizer 14 which blackens at a first temperature to one side surface of a substrate 12 formed in a street form and applying a second heat sensitizer 16 which blackens at a second temperature lower than the first temperature to the other side surface. For a heating method, when a heating element is heated in order to record on one side surface of the both-sided recording medium 10, the heating element is so heated as to reach the first temperature before temperature of the other side surface of the both-sided recording medium 10 reaches the second temperature. When the heating element is heated in order to record on the other side surface of the both side recording medium 10, the heating element is heated to the second temperature or higher to and lower than the first temperature.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-sided recording medium and a double-sided recording method for performing recording on the double-sided recording medium. More specifically, the present invention relates to a heat-sensitive double-sided recording medium suitable for use in a facsimile machine and the like. The present invention relates to a double-sided recording method for controlling the temperature of a heating element of a thermal head for recording.

[0002]

2. Description of the Related Art Conventionally, a method of recording on a heat-sensitive recording medium such as a heat-sensitive paper via a thermal head has been known in a facsimile apparatus, a printing apparatus and the like. The surface of the thermal paper is coated with a heat-sensitive agent that blackens at the heat generation temperature when the heating element of the thermal head generates heat for recording. When the heat generating element of the thermal head makes contact with the surface coated with the heat sensitive agent, the heat sensitive agent in the portion in contact with the heat generating element becomes black, and information or the like is recorded on the heat sensitive paper.

[0003]

However, the above-mentioned conventional thermal recording medium has the following problems. Since the heat-sensitive recording medium can record on only one surface coated with a heat-sensitive agent, it cannot record on the other surface. Therefore, twice as much thermal recording medium is required as compared with the case where recording is possible on both front and back sides. Generally, thermal paper is more expensive than plain paper, and it is uneconomical to record on only one side. Therefore, an object of the present invention is to provide a heat-sensitive double-sided recording medium capable of recording on both front and back sides, and a double-sided recording method for recording on the recording medium.

[0004]

In order to solve the above problems, the present invention has the following constitution. That is, in a double-sided recording medium, a first heat-sensitive agent that blackens at a first temperature is applied to one surface of a sheet-shaped substrate, and a second heat-sensitive second temperature lower than the first temperature is applied to the other surface. It is characterized in that it is formed by applying a second heat-sensitive agent that blackens at the temperature of. The method of recording on the double-sided recording medium is as follows. A first heat-sensitive agent that blackens at a first temperature is applied to one surface of a substrate formed in a sheet shape, and the other surface has a temperature lower than the first temperature. In a double-sided recording method of recording on a double-sided recording medium formed by applying a second heat-sensitive agent that is blackened at a second temperature through a thermal head having a heating element, one side of the double-sided recording medium is When heating the heating element for recording, the heating element is heated to reach the first temperature before the temperature of the other surface of the double-sided recording medium reaches the second temperature. When heating the heating element to perform recording on the other surface of the recording medium, the heating element is heated to a temperature equal to or higher than the second temperature and lower than the first temperature.

[0005]

[Operation] The operation will be described. The double-sided recording medium is formed by applying a first heat-sensitive agent that blackens at a first temperature on one surface of a substrate and a second heat-sensitive agent that blackens at a second temperature on the other surface. Therefore, it is possible to record on both sides of the double-sided recording medium. Further, the method of recording on the double-sided recording medium is such that when the heating element is heated to perform recording on one surface of the double-sided recording medium via the thermal head having the heating element, the heating element is Since the other surface is heated so as to reach the first temperature before reaching the second temperature, it is possible to record on the one surface without blackening the other surface. When heating the heating element for recording on the other surface, the heating element is heated to a temperature equal to or higher than the second temperature and lower than the first temperature. Since it is possible to record on the surface of, the double-sided recording becomes possible.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. First, a thermal paper, which is an example of the double-sided recording medium of this embodiment, will be described. In FIG. 1, 12
Is a substrate, which is a sheet of paper. As the base 12, in addition to paper, a synthetic resin sheet, a sheet-shaped member obtained by impregnating paper with synthetic resin, a laminated sheet of paper or a sheet of synthetic resin, a laminate of paper and synthetic resin in a sandwich shape, or the like. Can be adopted. Reference numeral 14 is a layer of the first heat sensitive agent, which is formed by applying the first heat sensitive agent 14 on the upper surface of the base 12. The first heat sensitive agent 14 blackens at a first temperature of 90 degrees Celsius. Reference numeral 16 is a layer of the second heat-sensitive agent, which is formed by applying the second heat-sensitive agent 16 to the lower surface of the base 12. Second heat sensitive agent 16
Blackens at a second temperature, which is lower than the first temperature, of 60 degrees Celsius.

The first temperature and the second temperature may be set in consideration of the material of the substrate 12 and the heating temperature of the blackening means. Contrary to FIG. 1, the second heat-sensitive agent 16 is applied to the upper surface side of the base 12 and the first heat sensitive agent 16 is applied to the lower surface side of the base 12.
The heat sensitive agent 14 may be applied. 2 to 4 of the double-sided recording method using the thermal paper 10 of this embodiment.
Will be further described. In this example, double-sided recording is performed on the thermal paper 10 with the thermal head of the facsimile machine. In order to perform recording, the thermal paper 10 is fed into the thermal head 18 and the paper feed platen 20.

A large number of heating elements (not shown) are arranged on the lower surface of the thermal head 18. When this heating element is selectively heated, the heat sensitive agent of the thermal paper 10 reacts with the heat of the heating element to turn black. The heating temperature of the heating element can be controlled by the number of pulses applied to the heating element per unit time.
In this example, M pulses per second are applied to the heating element to bring the temperature of the heating element to 90 degrees Celsius, and less than M pulses per second to bring the temperature of the heating element to 60 degrees Celsius. N pulses are applied to the heating element. The control of the number of pulses applied to the heating element of the thermal head 18, that is, the temperature control of the heating element is performed by a microprocessor mounted in the facsimile apparatus.

First, the upper surface side of the thermal paper 10, that is, the first
Recording is performed on the surface coated with the heat-sensitive agent 14. At that time, the platen 20 is rotated in a predetermined direction to move the heat-sensitive paper 10.
To send. When recording, the first heat sensitive agent 14 is blackened at 90 degrees Celsius, so the temperature of the heating element of the thermal head 18 is heated to 90 degrees Celsius or higher. This heating is performed rapidly, and immediately after the first heat-sensitive agent 14 is blackened, the temperature of the heating element is lowered. Only the first heat-sensitive agent 14 on the upper surface side of the thermal paper 10 is blackened, and the second heat-sensitive agent 16 applied on the lower surface side.
Is not blackened. Therefore, before the temperature of the lower surface of the thermal paper 10 reaches 60 degrees Celsius, the temperature of the upper surface is 90 degrees Celsius.
Heat to reach degree. Therefore, the thermal head 18
The surface of the thermal paper 10 corresponding to is the upper surface coated with the first thermal agent 14. This heating method is shown in the graph of FIG.
In FIG. 3, the solid line indicates the temperature of the upper surface of the thermal paper 10, and the alternate long and short dash line indicates the temperature of the lower surface. On the thermal paper 10, the place where recording is performed is constantly moved by the rotation of the platen 20 and the like, so that the above heating method can prevent the lower surface of the thermal paper 10 from becoming black. The number of pulses applied to the heating element per unit time is set in advance to a number that is empirically known so as to form the pattern shown in the graph of FIG.

When the recording on the upper surface side of the thermal paper 10 is completed, the recording is performed on the lower surface side while rotating the platen 20 in the opposite direction to the case of recording on the upper surface side without reversing the thermal paper 10. The reason why the recording is performed while rotating the platen 20 in the opposite direction without inverting the thermal paper 10 is to shorten the time required for recording. The surface may be the upper surface, or the thermal paper 10 may be returned to the original position once and recording may be performed while rotating the platen 20 in the same direction as before. As the reversing mechanism of the thermal paper 10, for example, the mechanism disclosed in Japanese Patent Laid-Open No. 2-277670 can be used. Although the recording is performed on the upper surface side of the thermal paper 10 first and then on the lower surface side here, the order may be reversed. In this embodiment, since recording is performed on the lower surface side without inverting the thermal paper 10, when heating the heating element of the thermal head 18, the heating element is heated to a temperature of 60 degrees Celsius or more and less than 90 degrees Celsius. To heat. This is because the first heat-sensitive agent 14 on the upper surface side is not blackened and only the second heat-sensitive agent 16 on the lower surface side is blackened. This heating method is shown in the graph of FIG. In FIG. 4, the solid line represents the temperature of the upper surface of the thermal paper 10, and the alternate long and short dash line represents the temperature of the lower surface. The number of pulses applied to the heating element per unit time is set in advance to a number that is empirically known so as to form the pattern shown in the graph of FIG.

In the present embodiment, when recording on the lower surface side of the thermal paper 10, the thermal paper 10 is not inverted, and the platen 20 is rotated in the opposite direction for recording. Therefore, the data to be recorded is recorded before the recording. It is stored in advance in a storage means such as a RAM and read by a microprocessor to control the heating of the thermal head 18 and the rotation of the platen 20. At that time, the thermal head 18 is controlled so that even when the same character is printed on the upper surface side and the lower surface side, the same character has a line-symmetric pattern. When reversing the thermal paper 10, it is not necessary to make the pattern symmetrical. If data to be recorded on both the upper surface side and the lower surface side of the thermal paper 10 is previously stored in the storage means, the microprocessor alternately reads the data on the upper surface side and the lower surface side, and the data on the upper surface side and the lower surface side is read. It is also possible to record data alternately. Although various embodiments of the present invention have been described above, the present invention is not limited to the above embodiments,
For example, the method of the present invention can be applied to various devices having a thermal head, such as a word processor and a printer, in addition to a facsimile device. Needless to say, many more modifications can be made without departing from the spirit of the invention. is there.

[0012]

In the double-sided recording medium according to the present invention, one surface of the substrate is coated with the first heat-sensitive agent which is blackened at the first temperature,
Since the other surface is coated with the second heat-sensitive agent that is blackened at the second temperature, it is possible to record on both sides of the double-sided recording medium, so that the consumption of the double-sided recording medium can be suppressed and it is economical. Further, the method of recording on the double-sided recording medium is such that when the heating element is heated to perform recording on one surface of the double-sided recording medium via the thermal head having the heating element, the heating element is Since the other surface is heated so as to reach the first temperature before reaching the second temperature, it is possible to record on the one surface without blackening the other surface. When heating the heating element to record on the other surface, the heating element
Since it is heated to a temperature equal to or higher than the temperature of less than the first temperature and less than the first temperature, it is possible to record on one surface without blackening the other surface, and thus double-sided recording becomes possible. It has a remarkable effect such as being usable.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of a double-sided recording medium according to the present invention.

FIG. 2 is an explanatory diagram showing a method of recording on a double-sided recording medium according to the present invention.

FIG. 3 is a graph showing a method of heating a thermal head according to the recording method.

FIG. 4 is a graph showing a method of heating a thermal head according to the recording method.

[Explanation of symbols]

 10 Thermal Paper 12 Base 14 First Thermal Agent 16 Second Thermal Agent 18 Thermal Head 20 Platen

Claims (2)

[Claims] 1. A first heat-sensitive agent that is blackened at a first temperature is applied to one surface of a sheet-shaped substrate, and a second temperature lower than the first temperature is applied to the other surface. Second blackened by
A double-sided recording medium characterized by being coated with the heat-sensitive agent of. 2. A first heat-sensitive agent that is blackened at a first temperature is applied to one surface of a sheet-shaped substrate, and a second temperature lower than the first temperature is applied to the other surface. Second blackened by
In a double-sided recording method for performing recording on a double-sided recording medium coated with a heat-sensitive agent via a thermal head having a heating element, the heating element is heated to perform recording on one surface of the double-sided recording medium. In order to perform recording on the other surface of the double-sided recording medium, the heating element is heated to reach the first temperature before the temperature of the other surface of the double-sided recording medium reaches the second temperature. When the heating element is heated, the heating element is heated to the second temperature or higher,
Further, the double-sided recording method is characterized by heating to a temperature lower than the first temperature.