JPH03227277A - Heat transfer recording device and facsimile device using same - Google Patents

Abstract

PURPOSE:To make it possible to record half-tone image with the same density as other images by a method wherein when half-tone image is detected, the carrying quantity of an ink sheet to a recording medium is made larger to perform the recording. CONSTITUTION:It is checked that a received image is binary image or half-tone image. This is decided, e.g., based on control information which is included in a control signal transmitted by a facsimile device on the transmitting side. This control information is stored in a RAM 115 at the time of receiving, and based on this stored information, it is discriminated that an image which is stored in a line memory 110 at the present time is binary image or half-tone image. When it is half-tone image, recording data for one line is output to a shift register 130 of a thermal head 13 by serial. When transfer of the recording data for one line is completed, a latch signal is output, and the recording data for one line is stored in a latch circuit 131.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a thermal transfer recording device that records an image on the recording medium by transferring ink contained in an ink sheet to a recording medium, and a facsimile machine using the device. It is related to.

[Prior Art] In general, thermal transfer printers use an ink sheet in which a base film is coated with heat-melting (or heat-sublimable) ink, and a thermal head selectively heats the ink sheet in response to image signals. Images are recorded by transferring the molten (or sublimated) ink onto recording paper. Generally, this ink sheet is one in which the ink is completely transferred to the recording paper by one image recording (a so-called one-time sheet), so after the image recording of one character or one line is completed, the recorded length is It was necessary to transport the ink sheet by the amount corresponding to the amount of paper being printed, and to ensure that the unused portion of the ink sheet was brought to the next recording position.This increased the amount of ink sheet used, and it was necessary to record on thermal paper. Thermal transfer printers tend to have higher running costs than regular thermal printers.

In order to solve these problems, Japanese Unexamined Patent Publication No. 57-83
471, Japanese Unexamined Patent Publication No. 58-201686, and Japanese Patent Publication No. 62-58917, thermal transfer printers have been proposed in which recording paper and ink sheets are conveyed at different speeds.

As an ink sheet used in these thermal transfer printers, an ink sheet (multi-print sheet) that can record an image multiple (n) times is known, and if this ink sheet is used, the recording length L can be continuously recorded. When recording, the conveyance length of the ink sheet conveyed after each image recording or during image recording is set to be smaller than that length (L/
n:n>1). This results in
The ink sheet usage efficiency is n times higher than that of the conventional method, and it is expected that the running costs of thermal transfer printers will be reduced. below,
This recording method is called multiprint.

[Problems to be Solved by the Invention] Generally, in halftone mode, etc. where the recording speed is slow, the period of power supply to the thermal head is long (as a result, the temperature of the thermal head decreases and the ink on the ink sheet melts). Or, it tends to sublimate. However,
In the thermal transfer printer described above, the value of n is fixed, so that the relative speed between the recording paper and the ink sheet is not changed even in a situation where ink on the ink sheet is difficult to transfer. For this reason, there is a possibility that the amount of ink transferred may change and the density of the recorded image may decrease.

The present invention has been made in view of the above conventional example, and when recording a halftone image, the amount of conveyance of the ink sheet relative to the recording medium is increased, thereby making the halftone image similar to other images. An object of the present invention is to provide a thermal transfer recording device capable of recording with high density and a facsimile device using the device.

[Means for Solving the Problems] In order to achieve the above object, the thermal transfer recording device of the present invention has the following configuration. That is, it is a thermal transfer recording device that transfers ink contained in an ink sheet to a recording medium to record an image on the recording medium, and includes an ink sheet conveying means that conveys the ink sheet, and a recording device that conveys the recording medium. a medium conveyance means; a recording means for recording an image on the recording medium by acting on the ink sheet conveyed by the ink sheet conveyance means; a detection means for detecting whether the image to be recorded is a halftone image; The image forming apparatus further includes a control means for controlling such that when a halftone image is detected by the detection means, the amount of conveyance of the ink sheet relative to the recording medium is increased to perform recording.

Further, a facsimile apparatus according to another invention has the following configuration. That is, it is a facsimile machine using a thermal transfer recording device that transfers ink contained in an ink sheet to a recording medium to record an image on the recording medium, and includes a transmitting/receiving means for transmitting and receiving image signals, and a means for conveying the ink sheet. an ink sheet conveying means for conveying the recording medium, a recording medium conveying means for conveying the recording medium, a recording means for recording an image on the recording medium by acting on the ink sheet conveyed by the ink sheet conveying means, and the transmitting/receiving means. a detection means for detecting whether an image received by the apparatus is a halftone image; and when the detection means detects that the image is a halftone image, control is performed to increase the amount of conveyance of the ink sheet relative to the recording medium for recording. and control means.

[Function] The thermal transfer recording device and facsimile device of the present invention having the above configuration detect whether or not the image to be recorded is a halftone image, and when a halftone image is detected, the amount of conveyance of the ink sheet relative to the recording medium is adjusted. The image is enlarged and recorded.

[Embodiments] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[Description of facsimile machine (Figs. 1 to 4)] Figs. 1 to 4 are diagrams showing an example in which a thermal transfer printer using an embodiment of the present invention is applied to a facsimile machine. FIG. 2 is a block diagram showing a schematic configuration of the facsimile device, FIG. 3 is a side sectional view of the facsimile device, and FIG. 4 is a recording device. FIG. 3 is a diagram showing a conveyance mechanism for paper and ink sheets.

First, the schematic structure of the facsimile apparatus of the embodiment will be explained based on FIG.

In the figure, reference numeral 100 denotes a reading unit that photoelectrically reads an original and outputs it as a digital image signal to a control unit 101, and is equipped with an original transport motor, a CCD image sensor, and the like. Next, the configuration of this control section 101 will be explained. A line memory 110 stores image data for each line of image data, and when transmitting or copying a document, one line of image data from the reading section 100 is stored.
When image data is received, one line of decoded received image data is stored. Image formation is then performed by outputting the stored data to the recording unit 102. Reference numeral 111 denotes an encoding/decoding unit that encodes image information to be transmitted by MH encoding or the like, and decodes received encoded image data to convert it into image data. Further, 112 is a buffer memory that stores encoded image data that is transmitted or received. Each part of the control unit 101 is controlled by a CPU 113 such as a microprocessor. In addition to the CPU 113, the control unit 101 includes a ROM 114 that stores control programs and various data for the CPU 113, and a CPU.
It is equipped with a RAM 115 for temporarily storing various data as a work area of 113.

102 is a recording unit equipped with a thermal line head and records an image on recording paper by a thermal transfer recording method; this configuration is similar to that of the third recording unit;
This will be described in detail later with reference to the drawings. Reference numeral 103 is an operation unit that includes various function instruction keys such as starting transmission, keys for entering a telephone number, etc. 103a is a switch for instructing the type of ink sheet to be used; when the switch 103a is on, a multi-print ink sheet is used. However, when it is off, it indicates that a normal ink sheet is loaded. A display section 104 is usually provided adjacent to the operation section 103 and displays various functions, the status of the device, and the like. 105 is a power supply unit for supplying power to the entire device. Also, 1
06 is a modem (modulator/demodulator), 107 is a network control unit (NC) that performs automatic call reception operation by ring detection and line control operation.
U), 108 is a telephone.

Next, the configuration of the recording section 102 will be explained in detail with reference to FIG. Note that common parts in each drawing are indicated by the same figure number.

Next, the configuration of the recording section 102 will be explained in detail with reference to FIG. Note that parts common to FIG. 2 are indicated by the same figure numbers.

In the figure, 10 indicates recording paper 11, which is plain paper, as a core 10.
A is a roll of paper wound into a roll. The roll paper 10 is rotatably housed in the apparatus so that the recording paper 11 can be supplied to the thermal head 13 by rotation of the platen roller 12 in the direction of the arrow. Note that 10b is a roll paper loading section, in which the roll paper 10 is removably loaded. Furthermore, 12 is a platen roller which conveys the recording paper 11 in the direction indicated by the arrow and presses the ink sheet 14 and the recording paper 11 between it and the heating element 132 of the thermal head 13. Thermal head 13
As the platen roller 12 further rotates, the recording paper 11 on which the image has been recorded due to the heat generated by the
(16a, 16b), and when the image recording for one page is completed, the cutters 15 (15a, 15b) are engaged to cut the paper into pages.

17 is an ink sheet supply roll that winds the ink sheet 14, and 18 is an ink sheet take-up roll, which is driven by an ink sheet conveyance motor to be described later and winds up the ink sheet 14 in the direction of arrow a. . In addition,
The ink sheet supply roll 17 and the ink sheet take-up roll 18 are connected to an ink sheet loading section 7o in the apparatus main body.
It is removably loaded. Furthermore, 19 is a sensor for detecting the remaining amount of the ink sheet 14 and the conveying speed of the ink sheet 14. Further, 2° is an ink sheet sensor for detecting the presence or absence of the ink sheet 14;
is a spring that presses the thermal head 13 against the platen roller 12 via the recording paper 11 and the ink sheet 14. Further, 22 is a recording paper sensor for detecting the presence or absence of recording paper.

Next, the configuration of the reading section 100 will be explained.

In the figure, 30 is a light source that illuminates the original 32;
The light reflected by CCD sensor 2 is input to CCD sensor 31 through an optical system (mirror 50, 51, lens 52) and converted into an electrical signal. The document 32 is conveyed by conveyance rollers 53, 54, 55, and 56 driven by a document conveyance motor (not shown).
Accordingly, the document 32 is transported in accordance with the reading speed of the document 32.

Note that 57 is a document loading table, and the plurality of documents 32 stacked on this loading table 57 are separated one by one by the cooperation of the conveying roller 54 and the pressing separation piece 58 and sent to the reading section 100. transported.

A control board 41 constitutes the main part of the control section 101, and various control signals are output from this control board 41 to each part of the apparatus. Further, 105 is a power supply unit that supplies power to each part;
06 is a modem board unit, and 107 is an NCU board unit having a relay function with a telephone line.

Furthermore, FIG. 4 is a diagram showing details of the conveyance mechanism for the ink sheet 14 and the recording paper 11.

In the figure, 24 rotationally drives the platen roller 12;
This is a recording paper transport motor for transporting the recording paper 11 in the direction indicated by the arrow, which is opposite to the direction indicated by the arrow a. Further, 25 is an ink sheet conveyance motor for conveying the ink sheet 14 in the direction of arrow a by means of a capstan roller 71 and a pinch roller 72. Further, 26 and 27 are transmission gears that transmit the rotation of the recording paper conveyance motor 24 to the platen roller 12, and 73 and 74 are transmission gears that transmit the rotation of the ink sheet conveyance motor 25 to the capstan roller 71. Further, 75 is a slip clutch unit.

Here, the ratio of the gears 74 and 75 is set so that the length of the ink sheet 14 wound on the take-up roll 18 by the rotation of the gear 75a is longer than the length of the ink sheet conveyed by the capstan roller 71. By keeping
The ink sheet 14 conveyed by the capstan roller 71 is reliably wound onto the take-up roll 18. and,
An amount corresponding to the difference between the amount of the ink sheet 14 taken up by the take-up roll 18 and the amount of the ink sheet 14 fed by the capstan roller 71 is transferred to the slip clutch unit 7.
Absorbed in 5. This makes it possible to suppress fluctuations in the transport speed (amount) of the ink sheet 14 due to fluctuations in the winding diameter of the winding roll 18.

FIG. 1 shows a control unit 10 in a facsimile machine according to an embodiment.
1 and the recording unit 102, and parts common to other drawings are indicated by the same figure numbers.

The thermal head 13 is a line head. The thermal head 13 includes a shift register 130 for inputting one line of serial recording data from the control unit 101 and a shift clock 43, and a latch circuit 131.1 for latching data in the shift register 130 using a latch signal 44. Heating element 13 consisting of a line of heating resistors
It is equipped with 2. Here, the heating resistor 132 is 132-
It is divided into m blocks indicated by 1 to 132-m and driven.

Further, 133 is a temperature sensor attached to the thermal head 13 for detecting the temperature of the thermal head 13. The output signal 42 of this temperature sensor 133 is A/D converted within the control section 101 and input to the CP0113. As a result, the CPU 113
3, and change the pulse width of the strobe signal 47 corresponding to the temperature, or change the driving voltage of the thermal head 13 according to the characteristics of the ink sheet 14. The applied energy is changed. 116 is a programmable timer, C
The clock time is set by the PU 113, and when the start of time measurement is instructed, the time measurement is started. Then, it operates to output an interrupt signal, a timeout signal, etc. to the CPU 113 at each instructed time. As a result, the CPU 113 determines the current supply time to the thermal head or the motor 24.2.
5 excitation timings can be determined.

Note that the characteristics (type) of the ink sheet 14 may be determined by detecting the switch 103a of the operation unit 103 described above, a mark printed on the ink sheet 14, etc. The identification may be made by marks, notches, protrusions, etc. attached to the surface.

Reference numeral 46 denotes a drive circuit that inputs a drive signal for the thermal head 13 from the control unit 101 and outputs a strobe signal 47 for driving the thermal head 13 in units of blocks. Note that this drive circuit 46 changes the voltage output to the power supply line 45 that supplies current to the heating element 132 of the thermal head 13 in accordance with instructions from the control unit 101 to control the thermal head 13.
The applied energy of can be changed. Reference numeral 36 denotes a drive circuit that engages and drives the cutter 15, and includes a cutter drive motor and the like. 39 is a paper ejection motor that rotationally drives the paper ejection roller 16.

35, 48, and 49 are the corresponding paper ejection motors 39
, a driver circuit that rotationally drives the recording paper conveyance motor 24 and the ink sheet conveyance motor 25. 141,1
42 is a motor control signal that instructs the number of steps and excitation method of the recording paper conveying motor 24 and the ink sheet conveying motor 25, respectively. Note that these paper ejection motors 3
9, the recording paper conveyance motor 24, and the ink sheet conveyance motor 25 are stepping motors in this embodiment, but are not limited to this (for example, they may be DC motors, etc.).

[Description of Recording Process (Figures 1 to 5)] Figure 5 is a flowchart showing the image recording process for one page in the facsimile machine of the embodiment. is stored in

This process starts when image data for one line to be recorded is stored in the line memory 110, and a state is reached in which the image recording operation can be started. Here, it is assumed that the control unit 101 has determined by the switch 103a or the like that a multi-ink sheet is attached.

First, in step S1, it is determined whether the received image is a binary image or a halftone image. This is, for example, a control signal sent from a sending facsimile machine (for example, N5F
) is determined based on the control information contained in This control information is stored in the RAM 115 at the time of reception, and based on this stored information, it is determined whether the image currently stored in the line memory 110 is a binary image or a halftone image, and the binary image is If so, the process advances to step S2 and n is set to "5°."On the other hand, if it is a halftone image, the process advances to step S3 and n is set to "4°."

Next, the process proceeds to step S4, where one line of recording data is serially output to the shift register 130 of the thermal head 13. When the transfer of one line of recording data is completed, the latch signal 44 is output in step S5, and one line of recording data is stored in the latch circuit 131.

Next, the process proceeds to step S6, where the ink sheet conveyance motor 2
5 to convey the ink sheet 14 17n lines in the direction of arrow a in FIG. Next, the process proceeds to step S7, and the recording paper conveyance motor 24 is driven to convey the recording paper 11 by one line (in this embodiment, 1/15.4 mm).

In this way, one line of recording data is stored in one thermal head.
3 and the conveyance of the ink sheet 14 and recording paper 11 is started, the process advances to step S8, and the thermal head 1
Electricity is supplied to each block of the heating resistors 132 of No. 3 to perform transfer recording of one line. Note that during the recording of this 1 line, if recording data of the next line exists, the data of the next line is sequentially transferred to the shift register 130 of the thermal head 13.

Once one line has been recorded in this manner, the process advances to step S9 to check whether the image recording process for one page has been completed. If the recording process for one page has not been completed, the process advances to step S10, and it is checked whether all the recording data of the next line has been transferred to the thermal head. If the transfer has not been completed, the data of the next line is transferred in step Sll. When all of the print data of the 0th-order line to be performed has been transferred to the shift register 130 of the thermal head 13, the process returns from step SIO to step S5, and the above-described printing process is executed.

When image recording for one page is completed in step S9, the process proceeds to step S12, where the recording paper 11 is fed by a predetermined amount in the direction of the paper ejection rollers 16 (16aa, 16b), and the cutters 15 (15a, 15b) are moved in step S23. They are driven and engaged to cut the recording paper 11 into pages. and,
The cut recording paper 11 is discharged from the apparatus by the discharge roller 16, and the remaining recording paper 11 is discharged in step S14.
is returned by a distance corresponding to the distance between the thermal head 13 and the cutter 15, and the recording process for one page is completed.

In this way, according to this embodiment, when recording a halftone image, the transport length of the ink sheet 14 relative to the recording paper 11 is longer than when recording a binary image. When recording a halftone image, the amount of ink transferred from the ink sheet 14 to the recording paper 11 increases, so even a halftone image recorded at a slow recording speed is recorded with the same density as a binary image.

[Explanation of Recording Principle (Figure 6)] Figure 6 shows image recording in this embodiment when an image is recorded using a multi-ink sheet with the conveyance directions of the recording paper 11 and ink sheet 14 reversed. It is a figure showing a state.

As shown in the figure, a recording paper 11 and an ink sheet 14 are held between a platen roller 12 and a thermal head 13, and the thermal head 13 is pressed against the platen roller 12 with a predetermined pressure by a spring 21. Here, the recording paper 11 is conveyed in the direction of the arrow at a speed Vp by the rotation of the platen roller 12. On the other hand, the ink sheet 14
is conveyed at a speed V in the direction of arrow a by the rotation of the ink sheet conveyance motor 25.

Now, power supply 1 is connected to heating resistor 132 of thermal head 13.
When the ink sheet 14 is energized and heated, the shaded portion 91 of the ink sheet 14 is heated. Here, 14a represents the base film of the ink sheet 14, and 14b represents the ink layer of the ink sheet 14. The ink in the ink layer 91 heated by energizing the heating resistor 132 is melted, and a portion of the ink layer 92 is transferred onto the recording paper 11 . This transferred ink layer portion 92 corresponds to approximately 1/n of the ink layer indicated by 91.

[Description of Ink Sheet (FIG. 7)] FIG. 7 is a cross-sectional view of the ink sheet 14 used for multi-printing in this embodiment, and here it is composed of four layers.

First, the second layer is a base film that serves as a support for the ink sheet 14. In the case of multi-printing, thermal energy is applied to the same location many times, so aromatic polyamide films and capacitor paper with high heat resistance are advantageous, but conventional polyester films can also be used. The thickness of these is preferably 3 to 8 μm from the viewpoint of strength, although the thinner the material is, the better the print quality.

The third layer is an ink layer containing an amount of ink that can be transferred n times onto a recording paper (recording sheet).

This component mainly consists of resin such as EVA as an adhesive, carbon black and nigrosine dye for coloring, carnauba wax and paraffin wax as binding materials, and is designed to withstand n times of use in the same place. It is blended. The coating amount is preferably 4 to 8 g/m'', but the sensitivity and density vary depending on the coating amount, and can be arbitrarily selected.

The fourth layer is a top coating layer for preventing pressure transfer of the third layer ink onto the recording paper in areas where printing is not performed, and is made of transparent wax or the like. As a result, only the transparent fourth layer is pressure-transferred, and it is possible to prevent background smudges on the recording paper. The first layer is the thermal head 13
This is a heat-resistant coating layer that protects the second layer base film from heat. This is suitable for multi-printing where 0942 minutes of thermal energy may be applied to the same location (when black information is continuous), but whether or not to use it can be selected as appropriate. It is also effective for base films with relatively low heat resistance, such as polyester films.

Note that the structure of the ink sheet 14 is not limited to this embodiment, and may be composed of, for example, a base layer and a porous ink-retaining layer containing ink provided on one side of the base layer. A heat-resistant ink layer having a microporous network structure may be provided thereon, and the ink may be contained within the ink layer. In addition, examples of the base film material include polyamide, polyethylene,
It may also be a film or paper made of polyester, polyvinyl chloride, triacetylcellulose, nylon, or the like. Furthermore, although a heat-resistant coating layer is not necessarily required,
The material may be, for example, silicone resin, epoxy resin, fluorine resin, nitrocellulose, or the like.

An example of an ink sheet containing a heat sublimable ink is a base material made of polyethylene terephthalate, polyethylene naphthalate, aromatic polyamide film, etc., and spacer particles made of guanamine-based resin and fluorine-based resin. An example is an ink sheet provided with a coloring material layer containing a dye.

Further, the heating method in the thermal transfer printer is not limited to the thermal head method using the above-mentioned thermal head (for example, an energization method or a laser transfer method may be used).

FIG. 8 is a block diagram showing electrical connections between a control section and a recording section of a facsimile apparatus according to another embodiment.

In the above-mentioned embodiment, whether the image is a binary image or a halftone image is determined based on the control signal sent from the sending device, but here, the received image data stored in the line memory 11 I am trying to make a judgment based on this. This is done by the binary/halftone judgment circuit 15.
It is 1.

In general, halftone images express the middle part with a certain dot pattern, so the number of black and white inversions in the main scanning direction is extremely large compared to the case of binary images.Therefore, the number of black and white inversions in the main scanning direction It is possible to determine whether the image is a binary image or a halftone image depending on the amount of the image.

Therefore, this binary/halftone judgment circuit 151 checks the number of black and white inversions in the main scanning direction of the image data, and if the number of times is equal to or greater than a predetermined number, determines that the image is a halftone image, and outputs the result to the CPU 113. By CPU1
13 can determine whether the image data currently stored in the line memory 110 is a halftone image or a binary image. Note that this determination may be executed by a control program of the CPU 113 stored in the ROM 114.

In the above embodiment, a thermal line head is used, but the present invention is not limited to this; a so-called serial type thermal transfer printer may also be used.

Furthermore, although the present embodiment has been described in the case of multi-printing, the present invention is not limited to this; it goes without saying that the present invention can also be applied to the case of normal thermal transfer recording using a one-time ink sheet.

Further, in the above-described embodiments, the thermal transfer printer is applied to a facsimile machine, but the thermal transfer recording device of the present invention is not limited to this, and can be applied to, for example, a word processor, a typewriter, or a copying machine. .

Further, the recording medium is not limited to recording paper, and may include cloth, plastic sheet, etc. as long as it is made of a material capable of ink transfer. In addition, the ink sheet is not limited to the roll configuration shown in the embodiment, and for example, the ink sheet is built in a casing that is removable from the main body of the recording apparatus, and the casing is attached to and removed from the main body of the recording apparatus. It may also be a sheet cassette type.

In addition, the ink sheet is not limited to the roll configuration shown in the embodiment, and for example, the so-called ink sheet is a so-called ink sheet in which the ink sheet is built in a casing that is removable to the main body of the recording apparatus, and the casing is removable from the main body of the recording apparatus. It may also be of a cassette type. Further, the ink sheet may be transported by winding the ink sheet with an ink sheet winding roller.

As explained above, according to this embodiment, when a halftone image is recorded, by recording with a small value of n, it is possible to prevent a decrease in the density of the halftone image.

Also, when recording a binary image, increase the value of n,
Since the conveyance length of the ink sheet relative to the recording paper can be increased, there is an effect that the ink sheet can be saved.

[Effects of the Invention] As described above, according to the present invention, when recording a halftone image, the conveyance amount of the ink sheet with respect to the recording medium is increased, thereby making the eight-tone image different from other images. It has the effect of being able to record at a density similar to that of .

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a block diagram showing the electrical connection between the control section and the recording section in the facsimile machine of the embodiment, and FIG. 2 is a block diagram showing the schematic configuration of the facsimile machine of the embodiment. 3 is a side cross-sectional view showing the configuration of the recording section of the facsimile machine of the embodiment, FIG. 4 is a diagram showing the conveyance mechanism for recording paper and ink sheets in the recording section of the embodiment, and FIG. 5 is the facsimile machine of the embodiment. A flowchart showing the recording process of the apparatus; FIG. 6 is a diagram showing the state of the recording paper and ink sheet during recording in this example; FIG. 7 is a diagram showing the cross-sectional shape of the multi-ink sheet used in this example; FIG. 8 is a diagram showing the connection between the control section and the recording section of a facsimile apparatus according to another embodiment. In the figure, 10... Rolled recording paper, Job... Roll paper loading section, 11... Recording paper, 12... Platen roller, 13... Thermal head, 14 Ink sheet for, 15...・Cutter, 16...Discharge roll, 17...
- Ink sheet supply roll, 18... Ink sheet take-up roll, 19... Sheet sensor, 20... Ink sheet presence/absence sensor, 21... Spring, 22...
Recording paper presence sensor, 24... Recording paper conveyance motor, 2
5... Ink sheet conveyance motor, 100... Reading section, 101.101a...-control section, 102... Recording section, 103... Operation section, 104... Display section, 10
5...Power supply, 106...Modem, 107...NC
U% 110... Line memory, 111... Encoding/decoding unit, 112... Buffer memory, l 13-
CPU, 114・ROM, 115...RAM% 13
2...Heating resistor (heating element).

Claims (4)

[Claims] (1) A thermal transfer recording device that records an image on the recording medium by transferring ink contained in an ink sheet to a recording medium, comprising: an ink sheet conveying means that conveys the ink sheet; and an ink sheet conveying means that conveys the recording medium. a recording medium conveyance means; a recording means for recording an image on the recording medium by acting on the ink sheet conveyed by the ink sheet conveyance means; a detection means for detecting whether the image to be recorded is a halftone image; When the detection means detects a halftone image,
A thermal transfer recording apparatus comprising: a control unit configured to increase the conveyance amount of the ink sheet relative to the recording medium for recording. (2) The thermal transfer recording apparatus according to claim 1, wherein the recording means records an image on the recording medium while maintaining a relative speed between the recording medium and the ink sheet. (3) A facsimile machine using a thermal transfer recording device that transfers ink contained in an ink sheet to a recording medium to record an image on the recording medium, the facsimile device comprising a transmitting/receiving means for transmitting and receiving image signals; an ink sheet conveyance means for conveying; a recording medium conveyance means for conveying the recording medium; a recording means for recording an image on the recording medium by acting on the ink sheet conveyed by the ink sheet conveyance means; a detecting means for detecting whether the image received by the means is a halftone image; and a detecting means for detecting whether the image received by the means is a halftone image, and when the detecting means detects that the image is a halftone image, the conveying amount of the ink sheet with respect to the recording medium is increased to perform recording. A facsimile device comprising: a control means for controlling; and a facsimile device. (4) The facsimile apparatus according to claim 3, wherein the recording means records the image on the recording medium while maintaining a relative speed between the recording medium and the ink sheet.