JPH11105327A - Thermal transfer recording apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance recording quality by controlling the count of pulses to be applied and the temperature of a heat-generating resistance body. SOLUTION: When a timing for applying pulses to a predetermined heat- generating resistance body comes (step 31), an application estimation data stored in an application estimation memory, that is, data indicating that it is a heat- generating resistance body to which pulses are applied with the same timing as the predetermined heat-generating resistance body is read out (step 32). A count value D showing a sum of the application estimation data is operated (step 33). A subtraction pulse count (m) corresponding to the count value D is read from a pulse count subtraction value table (step 34). The subtraction pulse count (m) is subtracted from an estimated count of pulses to be applied, thereby operating an application pulse count (n) (step 35). The application pulse count (n) is stored (step 36). Pulses of the application pulse count (n) are applied to the corresponding heat-generating resistance body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a thermal transfer type recording apparatus for performing recording in dot units by a thermal head having a heating element.

[0002]

2. Description of the Related Art Generally, a thermal transfer recording apparatus is provided with a thermal head comprising a plurality of heat generating resistors, and heats the heat generating resistors in a predetermined order in accordance with a pulse signal output from a control device. Alternatively, recording is performed in dot units via a thermal transfer ribbon. FIG. 12 shows the structure of a thermal head provided in such a thermal transfer recording apparatus. FIG. 12A is a partial explanatory view of the thermal head as viewed from above, and FIG. 12B is an explanatory view of the thermal head shown in FIG. )
FIG. 4 is an explanatory view showing a part of the thermal head shown in FIG.

As shown in FIG. 12A, a plurality of heating resistors R1 to Rn are linearly provided on a substrate surface of a ceramic substrate 91 constituting a thermal head 90. The resistor is provided at a position facing the thermal paper or the thermal transfer ribbon 92 as shown in FIG. Under such a structure, the heating resistor R1 is now generated by a pulse signal output from the control device.
Is heated, the heat generated from the heating resistor R1 is transmitted to the direction of the thermal transfer ribbon 92 and the inside of the ceramic substrate 91 as indicated by the arrow in FIG. When any one of the heating resistors R1 to Rn generates heat in this way, the thermal paper develops color or the heat-meltable ink of the thermal transfer ribbon 92 is melted and adheres to the recording paper, so that recording in dot units can be performed. Done.

[0004]

However, as shown in FIG.
Assuming that the heating resistor R3 is generating heat, the heat diffuses into the ceramic substrate 91 as shown by a dashed line in FIG.
The heat is transmitted to R4 to increase the temperature of these heating resistors.
That is, since the heating resistors R2 and R4 become higher than the target temperature and the excess ink is melted, the dot area becomes large and the characters are crushed. In particular, FIG.
In (C), when the heating resistors R2 and R4 are heated, the heating resistor R3 sandwiched between the heating resistors R2 and R4 is affected by twice the temperature as in the above case, so that the dot area is further increased. It becomes large, and the crushing of characters becomes noticeable. That is, in the above-described conventional thermal transfer recording apparatus, there is a problem that the recording quality is deteriorated due to the influence of the heat generated from the neighboring heating resistors.

Accordingly, the present invention provides a thermal transfer type recording apparatus capable of improving the recording quality by controlling the number of applied pulses in accordance with the magnitude of heat applied to a heating resistor to be heated. It is intended to be realized.

[0006]

According to the present invention, in order to achieve the above object, according to the first aspect of the present invention, there is provided a heating resistor which generates heat by applying a pulse and performs recording in dot units on a recording medium. In a thermal transfer recording apparatus for controlling the size of the dot by controlling the number of pulses, a thermal head having a plurality of thermal heads is provided. Detecting the number of heating resistors to which a pulse is applied at the timing at which the pulse is applied to the predetermined heating resistor, among the heating resistors existing in the vicinity of the predetermined heating resistor. Then, a technical means is employed in which pulse control means for controlling the number of pulses applied to the predetermined heating resistor based on the detection result is provided.

According to a second aspect of the present invention, in the thermal transfer recording apparatus according to the first aspect, the pulse control means is configured to control the predetermined heating resistance as the number of the detected heating resistors increases. It employs technical means of reducing the number of pulses applied to the body.

According to a third aspect of the present invention, in the thermal transfer recording apparatus according to the first or second aspect, the pulse control means includes the number of the detected heating resistors and the predetermined number. Technical means is employed in which a pulse number storage means for storing a subtracted value of the number of pulses applied to the heat generating resistor in association with each other is provided.

According to a fourth aspect of the present invention, in the thermal transfer type recording apparatus according to any one of the first to third aspects, the thermal head includes a heating element adjacent to the plurality of heating elements. Technical means is adopted in which the resistor is controlled so that the pulse is not applied at the same timing.

According to a fifth aspect of the present invention, in the thermal transfer recording apparatus according to any one of the first to fourth aspects, the plurality of heating resistors are arranged in a direction orthogonal to a recording direction. The technical means of being arranged is adopted.

[0011]

The pulse control means provided in the invention according to any one of the first to fifth aspects, when applying the pulse to the predetermined heat generating resistor, generates the heat generated near the predetermined heat generating resistor. Among the resistors, the number of heating resistors to which a pulse is applied is detected at a timing when a pulse is applied to the predetermined heating resistor, and the number of pulses to be applied to the predetermined heating resistor is determined based on the detection result. Control the number. That is,
The heat generation temperature of the predetermined heating resistor is affected by heat generated from another heating resistor to which a pulse is applied at a timing when a pulse is applied to the predetermined heating resistor, and the magnitude of the influence is as follows. The number of the heat-generating resistors is detected because the number of the heat-generating resistors varies according to the number of the heat-generating resistors. Further, since the heating temperature of the predetermined heating resistor changes according to the number of pulses applied to the predetermined heating resistor,
By controlling the number of the pulses based on the detection result, the heat generation temperature of the predetermined heat generating resistor can be controlled.

In particular, as in the second aspect of the present invention, control is performed such that the number of pulses applied to the predetermined heating resistor is reduced as the number of the detected heating resistors increases. That is, as the number of the detected heating resistors increases, the heat transmitted to the predetermined heating resistor increases. Therefore, by reducing the number of pulses applied to the predetermined heating resistor, the predetermined heating resistor is reduced. Prevents excessive body temperature rise.

The pulse control means stores the number of the detected heating resistors and the subtraction value of the pulse applied to the predetermined heating resistor in association with each other. When the number of heating resistors is detected, the number is compared with the pulse number storage means, and the number of pulses corresponding to the detected number is detected from the pulse number storage means. Can be read. For example, as described in an embodiment of the invention to be described later, the number of pulses to be reduced for each dot pattern formed by a heating resistor in the vicinity of a predetermined heating resistor is obtained by an experiment, and the detected heating resistor is determined. The number of pulses can be controlled by storing the number of pulses and the number of pulses in a ROM (pulse number storage means) or the like in a table format.

By the way, as described above, the thermal head provided in the thermal transfer recording apparatus has a so-called staggered drive system in which the above-mentioned pulse is not applied to adjacent heating resistors at the same timing. There is also a so-called all-dot drive type in which the pulse can be applied to the resistor at the same timing. Here, when the pulse is applied also to the adjacent heating resistor, the all-dot drive is greatly affected by the heat generated from the adjacent heating resistor. Since heat is not generated from the adjacent heating resistor, the influence of the heat is smaller than that of the all-dot drive. However, in the case of the staggered driving, the pulse generated when the pulse is applied to the predetermined heat generating resistor is also reduced.
It is affected by the heat generated from the heating resistor located two or more places apart. Then, the above-mentioned claim 1 to claim 3
The technical means according to any one of the above is controlled so that the pulse is not applied to the adjacent heating resistors at the same timing among the plurality of heating resistors as in the invention according to claim 4. It is also used for a thermal transfer type recording apparatus provided with a thermal head to be used.

Particularly, the dot density is large (for example, 2
56 dots 270 dpi) In a thermal transfer type recording apparatus having a thermal head, since the distance between the heating resistors is narrow, the effect of heat generated from the heating resistors located at one or more distant positions is considerably large. Since the recording quality cannot be improved without controlling the number of pulses applied to the predetermined heating resistor in consideration of the heat of
It is desirable to employ the technical means according to any one of claims 1 to 3 also in a thermal transfer recording apparatus provided with the staggered thermal head.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a thermal transfer recording apparatus according to the present invention will be described below with reference to the drawings. In the following embodiments, a tape printing device that prints characters such as characters and symbols, bar codes, and the like on a printing tape will be described as a typical example of a thermal transfer recording device. FIG. 1 is a perspective view showing the appearance of a tape printing apparatus according to an embodiment of the present invention, and FIG. 2 is an explanatory view showing a part of an internal mechanism of the tape printing apparatus shown in FIG. FIG. 3 is an explanatory view showing a thermal head provided in the tape printing apparatus shown in FIG.

The tape printer 10 includes a housing 11
The housing 11 is provided with an operation section 12 having a plurality of keys at a front portion thereof. A cover 13 is provided at a rear portion of the housing 11, and a printing mechanism 20 is built inside the cover 13. An LCD (liquid crystal display) 14 for displaying characters and symbols is provided behind the operation unit 12, and a release button 1 for opening the cover 13 is provided behind the LCD 14.
5 are provided. On the left side of the cover 13, a cutting operation button 17 for manually cutting the printing tape 16 is provided.

The operation unit 12 includes a character key for inputting alphabets, numbers, and symbols, a space key, a return key, a cursor movement key, and a size setting key for arbitrarily setting the size of a character to be printed. Any size 16, 24, 32, 48, 64, 96, 1
7 character size keys for setting a total of 28 dot sizes in 28 steps,
There are provided an automatic setting key to automatically set according to the tape width or the number of lines, a print key to instruct printing, an execution key to execute various processes, a power key to turn on / off the power, etc. I have.

Next, the printing mechanism 20 will be described with reference to FIG. A rectangular tape storage cassette 21 is detachably mounted on the printing mechanism 20.
The tape storage cassette 21 includes a tape spool 23 on which a transparent laminate film 22 is wound, a ribbon supply spool 25 on which a print ribbon 24 is wound, and a winding spool 28 for winding the printed ribbon 24 on which printing has been performed. When,
Double-sided tape 2 having the same width as the laminate film 22
6 is provided with a double-sided tape supply spool 27 wound with the release paper outside, and a joining roller 27 for joining the laminated film 22 and the double-sided tape 26 so as to be rotatable. In the double-sided tape 26, an adhesive layer is formed on both sides of the base tape, and a release paper is attached to the adhesive layer on one side.

Laminate film 22 and print ribbon 24
A thermal head 50 is provided at a position where the positions overlap. This thermal head 50 is, as shown in FIG.
R1 to R25 are provided on one side of the ceramic substrate 51.
6, each of which has 256 heating resistors, and each of the heating resistors is arranged in the width direction of the print ribbon 24 (in the direction orthogonal to the recording direction (FIG. 2).
Are arranged in a line in a direction perpendicular to the plane of the paper). That is, when all the heating resistors generate heat, one straight line is printed in the width direction of the print ribbon 24. Further, in the present embodiment, the thermal head 50 is driven by a staggered driving method.

As shown in FIG. 2, a platen roller 29 which presses the laminate film 22 and the printing ribbon 24 against the printing surface of the thermal head 50 is rotatably provided at a position facing the thermal head 50. I have. On the left side of the platen roller 29, a feed roller 30 that presses the laminate film 22 and the double-sided tape 26 against the joining roller 27 to form the print tape 16 composed of the laminate film 22 and the double-sided tape 26 is rotatably provided. I have. Platen roller 29 and feed roller 3
0 is provided on a support member 31 rotatably attached to the housing 11.

The printing mechanism 20 is provided with a manual cutting device 40 for cutting the printing tape 16. A plate-shaped frame 41 is provided inside the housing 11 in a vertical direction (a direction orthogonal to the paper surface), and a fixed blade 42 is fixed to the frame 41 in an upward direction. A front end of an operation lever 44 extending in the front-rear direction is rotatably supported on a shaft 43 fixed to the frame 41, and a movable blade 45 has a fixed blade 42 in front of the shaft 43 of the operation lever 44. And is installed facing. The rear end of the operation lever 44 is located below the cutting operation button 17. Usually, the operation lever 44 is moved in a direction in which the movable blade 45 is separated from the fixed blade 42 by an elastic member such as a spring (not shown). Being energized. Further, the front end of the operation lever 44 is provided with the operation lever 4 by pressing the cutting operation button 17.
A detection switch 46 for detecting that the 4 has rotated is attached.

The printing tape 16 fed from the tape storage cassette 21 has a tape width of 6 mm, 9 mm,
It can be used by selecting from five types of 12 mm, 18 mm, and 24 mm. For each tape width, the color of the base tape constituting the double-sided tape 26 (the ground color of the printing tape 16) and the color of the ink of the printing ribbon 24 are changed to black, red,
Blue, yellow... White can be used by selecting from a plurality of types of tape cassettes arbitrarily combined. On the bottom wall of these tape storage cassettes 21, a first protruding piece 32 in which three protruding claws are combined in order to detect which of the five types of tapes are mounted, and a double-sided tape 26 In order to detect which combination of the color of the base tape and the color of the ink of the print ribbon 24, the second protruding pieces 33 each including five protruding claws are provided.

The housing 11 has a first protruding piece 3.
The tape width sensor 34 (see FIG. 4) for detecting the tape width from the state of the second protruding claw, and the color of the base tape of the double-sided tape 26 and the color of the ink of the print ribbon 24 from the state of the protruding claw of the second protruding piece 33. And a tape color sensor 35 (see FIG. 4) for detecting the combination of the two. further,
A cassette detection switch 36 for detecting that the tape storage cassette 21 is mounted is provided on the housing 11.
(See FIG. 4).

When the tape feed motor 37 (see FIG. 4) is driven in the printing mechanism 20 having the above structure,
The joining roller 27 and the take-up spool 28 rotate synchronously in a predetermined direction, and the head drive circuit 70 (FIGS. 4 and 5A)
5) is applied to a predetermined heating resistor of the thermal head 50, and the predetermined heating resistor to which the pulse is applied generates heat and faces the heating resistor. The ink on the print ribbon 24 is melted, and the melted ink is transferred onto the laminate film 22.

In this manner, characters, bar codes, and the like are printed on the laminated film 22 by a plurality of dot rows, and the printed laminated film 22 is joined to the double-sided tape 26 by the joining roller 27 and the printing tape 16. As shown in FIG. 2 and FIG. 3, the tape is fed in the direction indicated by arrow F1 (tape feeding direction).
It is fed out of the housing 11. When the cutting operation button 17 is pressed downward after printing on the printing tape 16, the movable blade 45 approaches the fixed blade 42 via the operation lever 44, and the printing tape 16 is cut by these two blades 42, 45. Is done.

Next, the configuration of the main control system of the tape printer 10 will be described with reference to FIGS. FIG.
FIG. 2 is an explanatory diagram showing a configuration of a main control system of the tape printer 10 by blocks. FIG. 5A is an explanatory diagram showing the main configuration of the head drive circuit 70 shown in FIG. 4 by blocks, and FIG. 5B is an explanatory diagram showing print data and applied pulses. As shown in FIG. 4, the input / output interface 61 of the control device 60 includes the operation unit 12, the detection switch 46, the cassette detection switch 36, the tape width sensor 34, the tape color sensor 35, and the display data on the LCD 14. (Liquid Crystal Display Controller) 38 having a video RAM 38a for outputting an image, a thermistor 39 for judging the temperature of the environment where the thermal transfer recording apparatus 10 is placed, and a head for driving the thermal head 50 A drive circuit 70 and a motor drive circuit 47 for driving the tape feed motor 37 are connected to each other.

The input / output interface 61 includes:
Head drive circuit 70, motor drive circuit 47, and LCD
A CPU 63 for controlling C38, controlling the number of pulses applied to the heating resistors R1 to R256, and the like is connected via a bus 62. The CPU 63 has an application schedule memory 63a shown in FIG. 6B for storing the history of pulses applied to the heating resistors, and FIG. 6C for storing the number of pulses applied to each heating resistor. And an applied pulse number memory 63b shown in FIG. Also, input / output interface 6
1 has a CGROM 64 and a ROM 6 via a bus 62.
5, ROM 66 and RAM 67 are connected. C
The GROM 64 stores dot pattern data for displaying characters in association with the code data. The ROM 65 stores dot pattern data for printing characters such as alphabetic characters and symbols in code data. Is stored in correspondence with. The dot pattern data for printing is in Gothic typeface,
Eight types (16, 24, 32, 48, 64, 96, and 128 dot sizes) of print character sizes for each typeface are stored in association with code data. ing.

The ROM 66 stores a pulse number subtraction value table 66a shown in FIG. 6D used for setting a pulse to be applied to the heating resistor. Also, ROM
Reference numeral 66 denotes a head drive program for driving the thermal head 50, a pulse number control program for controlling the number of pulses applied to each heating resistor, and characters, numerals, and symbols input from the operation unit 12. Various programs such as a display control program for controlling the LCDC 38 corresponding to the character code data and a motor control program for controlling the tape feed motor 37 are stored. In addition, text data input from the operation unit 12 is stored in the text memory 67a of the RAM 67.
The address of the text memory 67a is stored in the text pointer 67b. The print character size memory 67c stores character size data used for printing set by the operation unit 12, and the print buffer 67d stores print dot pattern data of a plurality of characters and symbols as print data. .

Next, the configuration and operation of the head drive circuit 70 will be described with reference to FIG. The head drive circuit 70 is provided with a gate array 71 that controls the input of a serial print dot pattern data string read from the print buffer 67 d and output via the input / output interface 61. This gate array 71
In order to drive the heating resistors in the odd-numbered rows, “1” is created for the data corresponding to the odd-numbered dots, and “0” is created for the data corresponding to the even-numbered dots. “1” is created for data corresponding to even-numbered dots, and “0” is created for data corresponding to odd-numbered dots. The shift register 72 takes in serial print dot pattern data from the gate array 71 in synchronization with the clock signal CLK from the control circuit 60, and converts it into parallel print dot pattern data.

The latch circuit 73 fetches and latches parallel print dot pattern data from the shift register 72 in synchronization with the latch signal LAT. AND gate 74 is connected to latch circuit 7 in synchronization with strobe signal STB.
3 and fetches the printing dot pattern data and executes logical product. Then, the pulse signal output from the AND gate 74 is applied to the heating resistors R1 to R256, and the applied heating resistor generates heat.

Next, the structure of the pulse number subtraction value table stored in the ROM 66 will be described with reference to FIGS. FIG. 6A is a diagram showing the No. of the thermal head 50. No. 1 when 256 heating resistors from 1 to 256 are driven in a staggered row. It is an explanatory view showing an example of a dot pattern formed by three heating resistors of 1, 3, and 5, and FIG. (D) is an explanatory view showing a configuration of a pulse number subtraction value table. FIG. 9 is an explanatory diagram showing the dot pattern and the number of subtraction pulses in the case of the staggered row drive in association with each other.

In FIG. 9, ● represents a dot and ○ represents a dot.
Indicates that there is no dot, and ◎ indicates a dot (hereinafter, referred to as a current dot) formed by a heating resistor (a predetermined heating resistor of the present invention) that is about to generate heat by applying a pulse. . In this embodiment, the number of pulses applied to one heating resistor at one time is 63. However, the number of pulses is an example, and can be changed as appropriate.

First, a method for determining the number of subtraction pulses will be described. First, as shown in FIG. 6A, the timing for detecting the presence or absence of a dot is a timing (application timing) t3 at which a pulse is applied to the heating resistor forming the current dot ◎. As shown in FIG. 6A, the distance range for detecting the presence / absence of a dot is the heating resistor N at a position vertically separated from the current dot by two dots.
o. 1 and No. 5 (the thermal head 50 of the present embodiment is driven in a staggered array).

Then, as shown in FIG. 9, the dot pattern to be formed is weighted in three stages of "0" to "2", and the number m of subtraction pulses is set to a plurality of stages of 0 to 2. Then, “1” is counted for each formed dot, and the number of subtraction pulses is determined based on the total count value D. That is, as the count value D increases,
Since the influence on the heating temperature of the predetermined heating resistor ◎ increases, the weighting level is increased to increase the number of subtraction pulses.

More specifically, as shown in FIG. 9, when no dot is formed at the same timing as the current dot, the count value D = 0 and the number of subtraction pulses is “0”.
And When only one dot is formed, D
= 1, the number of subtraction pulses is “1”, and the number of dots is 2
When the number is formed, D = 2, so the number of subtraction pulses is “2”. Thus, the number of subtraction pulses is determined,
A table in which the count value D and the subtraction pulse number m are set in a table format is a pulse number subtraction value table 66a shown in FIG. It should be noted that the number of subtraction pulses is not limited to the above numerical value, but can be changed as appropriate as the count value D increases as the number increases.

Next, the configuration of an application schedule memory for storing whether or not a pulse is to be applied to the heating resistor will be described with reference to FIG. Scheduled memory 6
3a is configured to store whether or not a pulse is to be applied to each of the 256 heating resistors R1 to R256. For example, No. The dot pattern formed by three heating resistors 1, 3, and 5 is shown in FIG.
In the case shown in FIG. Since a pulse is applied to the heating resistor of No. 1 to form a dot, the No. “1” is stored in the application schedule data of the one heating resistor. Then, when the dot formation at the current timing by all the heating resistors is completed, the application scheduled data of each heating resistor at the current timing is updated to the application scheduled data at the next timing.

Next, a series of operations of the tape printer 10 having the above configuration will be described with reference to FIGS. 6 (C), 7 and 8. FIG. 6C is an explanatory diagram showing a configuration of an applied pulse number memory that stores the number of applied pulses for each heating resistor. FIG. 7 is a flowchart showing main control contents executed by the CPU 63, and FIG. 8 is a flowchart showing pulse number control processing contents executed in the print control of step 30 in FIG.

First, when the user of the tape printer 10 turns on the power key to turn on the power of the tape printer 10, the CPU 63 performs an initial setting (step 10).
Subsequently, display control for displaying characters, symbols, and the like input by the operation unit 12 on the LCD 14 is executed (step 20), and based on the printing dot pattern data corresponding to the input characters and the like, the thermal head The print control for printing by executing drive control of the tape feed motor 50 and the tape feed motor 37 is executed (step 30).

Here, the processing content of the pulse number control executed by the CPU 63 will be described with reference to FIG.
In this case, the dot pattern shown in FIG. 6A is formed, and the heating resistor No. forming the current dot ◎.
It is assumed that the number of pulses applied to 3 is calculated. Also,
Heating resistor No. It is assumed that the calculation of the number of pulses applied to 1 has been completed. First, the CPU 63 sets the heating resistor No. When it is time to apply a pulse to 3 and form the current dot (Step 31: Yes), the CPU 63
The application schedule data stored in the application schedule memory 63a is read out (step 32).

Then, the total value of the read application scheduled data, that is, the count value D is calculated (step 3).
3). Here, as shown in FIG. 6B, the heating resistor to which a pulse is to be applied is No. 1 heating resistor 1
Therefore, the count value D = 1. Then, CP
U63 checks the calculated count value D against the pulse number subtraction value table 66a stored in the ROM 66, and reads out the subtraction pulse number m corresponding to the count value D (step 34). Here, since the count value D = 1, as shown in FIG. 6 (D), the number of subtraction pulses m “1”
Is read. Subsequently, the CPU 63 calculates the applied pulse number n based on the read-out subtracted pulse number m (step 35), and stores the calculated applied pulse number n in the applied pulse number memory 63b (step 35). ).

Here, since the subtraction pulse number m = 1, the applied pulse number n = 63-1 = 62, and the pulse number data “62” is stored in the No. of the applied pulse number memory 63b. 3
(Step 36). Subsequently, the CPU 63 determines the remaining No. 5, no. 7, no.
9 ... No. 255 applied pulses n for a total of 126
Is determined (step 37), and if not completed (step 37: No), step 32
Returning to step 32, steps 32 to 36 are executed to calculate and store the number n of applied pulses. When the number of applied pulses n has been stored for all 128 heating resistors, the process waits until the next application timing is reached (step 31). In this way, the number n of applied pulses is stored in the applied pulse number memory 63b, and the CPU 63 creates an applied pulse (FIG. 5B) having the number of applied pulses stored in the applied pulse number memory 63b. Applied to the corresponding heating resistor. Here, the heating resistor No. 6 for 3
Two pulses are applied, and a dot having a size corresponding to the number of pulses is formed.

As described above, according to the tape printer 10 of the present embodiment, the heating resistor near the point where the pulse is applied at the timing of applying the pulse to the predetermined heating resistor to be heated is applied. The number of pulses applied to the predetermined heating resistor can be controlled based on the number. Accordingly, it is possible to prevent the temperature of the heating resistor from unnecessarily increasing and an excessive amount of ink from being melted, thereby improving recording quality. By the way, from step 31 executed in step 30 by the CPU 63 to step 37
Function as pulse control means of the present invention.

Next, a tape printing apparatus according to a second embodiment of the present invention will be described with reference to FIGS. The tape printing apparatus according to the second embodiment includes a so-called all-dot drive type thermal head that can apply a pulse to a heating resistor adjacent to a predetermined heating resistor at the same pulse application timing. I do. FIG. 10 (A)
No. of the thermal head 50 2 from 1 to 256
No. 56 when all the heating resistors are driven by all dots. 1
FIGS. 4A to 4C are explanatory diagrams showing an example of a dot pattern formed by three heating resistors of FIGS.
FIG. 4 is an explanatory diagram showing a configuration of an application-scheduled memory built in 3. FIG. 7C is an explanatory diagram showing the configuration of the applied pulse number memory built in the CPU 63, and FIG.
FIG. 9 is an explanatory diagram showing a configuration of a pulse number subtraction value table stored in the OM 66. FIG. 11 is an explanatory diagram showing the dot pattern and the number of subtraction pulses in the case of all-dot driving in association with each other.

The mechanical structure of the tape printing apparatus according to the second embodiment is the same as that of the tape printing apparatus according to the first embodiment, and a description thereof will be omitted. The content of the pulse number control executed by the CPU will be described with reference to the flowchart shown in FIG. First, as shown in FIG. 10A, the timing for detecting the presence / absence of a dot is a timing (application timing) t3 at which a pulse is applied to the heating resistor forming the current dot ◎. Further, as shown in FIG. 10A, the distance range for detecting the presence or absence of a dot is determined by the number of the heating resistor No. above and below the current dot ◎. 1 and No.
3 (because the thermal head 50 of the present embodiment is driven by all dots).

Then, as shown in FIG. 11, the dot pattern to be formed is divided into three stages, weighting is performed at each stage, and the number of subtraction pulses is set to a plurality of 0 to 2 stages. The weighting is performed based on the count value D obtained by counting “1” for each formed dot. In other words, the larger the count value D, the greater the effect on the heat generation temperature of the predetermined heat generating resistor ◎. Therefore, the weighting level is increased to increase the number of subtraction pulses.

More specifically, as shown in FIG. 11, when no dot is formed at the same timing as the current dot ◎, the count value D = 0 and the number of subtraction pulses is “0”. When only one dot is formed, D = 1 and the number of subtraction pulses is “1”. When two dots are formed, D = 2 and the number of subtraction pulses is “2”. ". The pulse number subtraction value table 66a shown in FIG. 10D is obtained by determining the number of subtraction pulses and setting the count value D and the number m of subtraction pulses in a table format.

More specifically, as shown in FIG. 11, the count value D = 0 when there is no dot formed at the timing immediately before the present (hereinafter referred to as the past) and at the present. Therefore, the number of subtraction pulses is set to “0”. If only one dot is formed, D = 1, so the number of subtraction pulses is “1”. If only two dots are formed, D = 2, so the number of subtraction pulses is “1”. 2 ". When only three dots are formed, D = 3, and the number of subtraction pulses is “3”. The count value D and the count value m are set in the form of a table in the manner described above, and the count value D and the count value m are set in the pulse count subtraction value table 66 shown in FIG.
a. It should be noted that the number of subtraction pulses is not limited to the above numerical value, but can be changed as appropriate as the count value D increases as the number increases.

Next, the configuration of an application schedule memory for storing whether or not a pulse is to be applied to the heating resistor will be described with reference to FIG. The application schedule memory 63a is configured to store the presence or absence of a pulse application schedule for each of the 256 heating resistors R1 to R256. For example, No. The dot pattern formed by the three heating resistors 1 to 3 is shown in FIG.
In the case shown in FIG. Since a pulse is applied to the heating resistor of No. 1 to form a dot, the No. “1” is stored in the application schedule data of the one heating resistor. Then, when the dot formation at the current timing by all the heating resistors is completed, the application scheduled data of each heating resistor at the current timing is updated to the application scheduled data at the next timing.

Next, the processing content of the pulse number control executed by the CPU 63 will be described with reference to FIG. Here, the dot pattern shown in FIG. 10A is formed, and the heating resistor No. forming the current dot ◎ is formed.
It is assumed that the number of pulses applied to 2 is calculated. Also,
Heating resistor No. It is assumed that the calculation of the number of pulses applied to 1 has been completed. First, the CPU 63 sets the heating resistor No. When it is time to apply a pulse to 2 and form the current dot ２ (step 31: Yes), the CPU 63
The application schedule data stored in the application schedule memory 63a is read out (step 32).

Then, the total value of the read application scheduled data, that is, the count value D is calculated (step 3).
3). Here, as shown in FIG. 10B, the heating resistor to which a pulse is to be applied is No. Since there is one heating resistor, the count value D = 1. Then, C
The PU 63 stores the calculated count value D in the ROM 66
Is compared with the pulse number subtraction value table 66a stored in the step (a), and the subtraction pulse number m corresponding to the count value D is read (step 34). Here, since the count value D = 1, as shown in FIG.
"1" is read. Subsequently, the CPU 63 calculates the applied pulse number n based on the read subtracted pulse number m (step 35), and calculates the calculated applied pulse number n.
Is stored in the applied pulse number memory 63b (step 3).
5).

Here, since the number of subtraction pulses m = 1, the number of applied pulses n = 63-1 = 62, and the pulse number data “62” is stored in the No. of the applied pulse number memory 63b. 3
(Step 36). Subsequently, the CPU 63 determines the remaining No. 3, No. 4, no.
5 ... No. Number of applied pulses n for 256 total 254
Is determined (step 37), and if not completed (step 37: No), step 32
Returning to step 32, steps 32 to 36 are executed to calculate and store the number n of applied pulses. When the storage of the number n of applied pulses is completed for all the 256 heating resistors, the process waits until the next application timing (step 31). In this way, the number n of applied pulses is stored in the applied pulse number memory 63b, and the CPU 63 creates an applied pulse (FIG. 5B) having the number of applied pulses stored in the applied pulse number memory 63b. Applied to the corresponding heating resistor. Here, the heating resistor No. 6 for 2
Two pulses are applied, and a dot having a size corresponding to the number of pulses is formed.

As described above, according to the tape printer 10 of the second embodiment, even when the thermal head 50 is of the all-dot drive type, the upper and lower portions of the predetermined heating resistor to be heated can be used. The number of pulses to be applied to the predetermined heating resistor is determined based on the number of heating resistors to which a pulse is applied at an application timing at which a pulse is applied to the predetermined heating resistor. Can be controlled. Accordingly, it is possible to prevent the temperature of the heating resistor from unnecessarily increasing and an excessive amount of ink from being melted, thereby improving recording quality.

The time range and the distance range for detecting the heating resistor to which the pulse is applied can be made wider than the range of each of the above embodiments to further improve the recording quality. Further, in each of the above embodiments, the tape transfer device was described as a typical example of the thermal transfer recording device of the present invention.
The present invention can be applied to a word processor, a printer, and the like.

[0055]

As described above, according to the present invention, the recording quality can be improved by controlling the number of applied pulses in accordance with the magnitude of heat applied to the heating resistor to be heated. Can be realized.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating an appearance of a tape printing apparatus according to an embodiment of the present invention.

FIG. 2 is a printing mechanism 20 of the tape printing apparatus 10 shown in FIG.
FIG.

FIG. 3 is an explanatory view of a thermal head 50 provided in the printing mechanism 20 shown in FIG.

FIG. 4 is an explanatory diagram showing the configuration of a main control system of the tape printer 10 shown in FIG. 1 by blocks.

FIG. 5A is a diagram showing a head drive circuit 70 shown in FIG. 4;
FIG. 4 is an explanatory diagram showing a main configuration of the first embodiment by blocks.
FIG. 4 is an explanatory diagram showing print data and applied pulses.

FIG. 6A is a diagram showing the No. of the thermal head 50.
No. 1 when 256 heating resistors from 1 to 256 are driven in a staggered row. FIG. 4 is an explanatory diagram showing an example of a dot pattern formed by three heating resistors 1, 3, and 5,
(B) is an explanatory diagram showing a configuration of an application schedule memory that stores a schedule to which a pulse is to be applied; (C) is an explanatory diagram showing a configuration of an application pulse number memory; and (D) is a pulse diagram. FIG. 4 is an explanatory diagram showing a configuration of a number subtraction value table.

FIG. 7 is a main flowchart showing the contents of main control executed by a CPU 63.

FIG. 8 is a flowchart showing the content of a pulse number control process executed in the print control of step 30 in FIG. 7;

FIG. 9 is an explanatory diagram showing the dot pattern and the number of subtraction pulses in the case of the staggered row driving in association with each other.

FIG. 10A is a view showing N in the thermal head 50;
o. No. 1 when 256 heating resistors from 1 to 256 are driven by all dots. FIG. 4 is an explanatory diagram illustrating an example of a dot pattern formed by three heating resistors of Nos. 1 to 3;
(B) is an explanatory diagram showing a configuration of an application schedule memory that stores a schedule to which a pulse is to be applied; (C) is an explanatory diagram showing a configuration of an application pulse number memory; and (D) is a pulse diagram. FIG. 4 is an explanatory diagram showing a configuration of a number subtraction value table.

FIG. 11 is an explanatory diagram showing the dot pattern and the number of subtraction pulses in the case of all-dot driving in association with each other.

12A is a partial explanatory view of the thermal head as viewed from above, FIG. 12B is an explanatory view of the thermal head shown in FIG. 12A as viewed from the side, and FIG. FIG. 4 is an explanatory view showing a part of the thermal head shown in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Tape printer 12 Operation part 16 Printing tape 20 Printing mechanism 21 Tape storage cassette 22 Laminating film 24 Printing ribbon 26 Double-sided tape 40 Cutting device 50 Thermal head 51 Substrate 60 Control circuit 63 CPU 63a Expected application memory 66a Pulse number subtraction value table ( Pulse number storage means) 70 Head drive circuit R1 to R256 Heating resistor

Claims (5)

[Claims] 1. A thermal head having a plurality of heating resistors that generate heat by application of a pulse and perform recording in dot units on a recording medium is provided, and the size of the dot is controlled by controlling the number of pulses. In the thermal transfer type recording apparatus for controlling the length, when applying the pulse to a predetermined heating resistor of the plurality of heating resistors, among the heating resistors existing in the vicinity of the predetermined heating resistor, A pulse for detecting the number of heating resistors to which a pulse is applied at a timing at which the pulse is applied to a predetermined heating resistor, and controlling the number of pulses to be applied to the predetermined heating resistor based on the detection result A thermal transfer type recording apparatus comprising a control unit. 2. The apparatus according to claim 1, wherein said pulse control means reduces the number of pulses applied to said predetermined heating resistor as the number of said detected heating resistors increases. 3. The thermal transfer recording device according to 1. 3. The pulse control means includes pulse number storage means for storing the number of detected heating resistors and a subtraction value of the number of pulses applied to the predetermined heating resistor in association with each other. The thermal transfer recording apparatus according to claim 1 or 2, wherein 4. The thermal head according to claim 1, wherein the heating head is controlled so that the pulse is not applied to adjacent heating resistors at the same timing among the plurality of heating resistors. A thermal transfer recording apparatus according to claim 1. 5. The thermal transfer recording apparatus according to claim 1, wherein the plurality of heating resistors are arranged in a direction orthogonal to a recording direction. .