JPH09159541A - Temperature detecting method and printer device having temperature detecting function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To minutely detect an ambient temperature outside of a casing when a temperature is detected by a temperature detecting sensor existing in the same casing as a heating part. SOLUTION: When a temperature in the vicinity of this temperature detecting sensor is detected by the temperature detecting sensor arranged in the same casing as a heating part heated by supply of a power source, a temperature difference between an ambient temperature outside the casing and a temperature in the vicinity of the temperature detecting sensor is supposed to become constant after constant time passes from power source closing time, and a temperature is detected even before the temperature difference becomes constant, and an ambient temperature outside of the casing is detected by considering a detected temperature and elapsed time up to detecting time from power source closing time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature detecting method and a printer device having a temperature detecting function.

[0002]

2. Description of the Related Art FIG. 6 shows an example of a circuit block diagram of a conventional printer device. On the memory map of the CPU 1, a memory group 2 including ROM and RAM storing programs is arranged. Further, the IO port group 3 is arranged on the IO map. A print mechanism unit 4 is connected to the print control circuit 6 via the driver circuit 5.

The CPU 1 controls the print control circuit 6 via the IO port group 3 to perform various controls such as sheet suction, line feed, printing and discharge. The temperature detection circuit 7 is arranged on the IO map as one of the IO ports. FIG. 7 is an explanatory diagram showing an example of the temperature detection circuit. A thermistor TH1 is used here as a temperature detection sensor. The thermistor is a device whose resistance value changes with temperature.
Note that the thermistor TH1 used here has a resistance value that increases as the temperature decreases, and exhibits constant characteristics depending on the temperature.

The resistance value (x) which changes with temperature is converted into a voltage by connecting to the resistors R1 and 5V. The voltage V1 that changes with temperature is represented by the following calculation formula. V1 = 5x / (R1 + x) [V]. Therefore, V1
Becomes gradually higher as the temperature of the thermistor TH1 decreases. The voltage of V1 is three comparators CO
It is compared by MP1 to MP3, and the output is BUF (LS2
According to (44), the IO port can be recognized by being read by the CPU.

Reference voltage V2 of COMP1 [= 5 (R3 +
R4 + R5) / (R2 + R3 + R4 + R5)] is the temperature 1
The voltage value converted to 0 ° C, the output TM of COMP1
P10 is “1” at 10 ° C. or higher and “0” at 10 ° C. or lower. Similarly, the reference voltage V3 of COMP2 [= 5
(R4 + R5) / (R2 + R3 + R4 + R5)] is a voltage value converted to a temperature of 20 ° C., and is the output T of COMP2.
MP20 becomes “1” at 20 ° C. or higher and “0” at 20 ° C. or lower.

Further, the reference voltage V4 of COMP3 [= 5.multidot.
R5 / (R2 + R3 + R4 + R5)] is a voltage value converted to a temperature of 30 ° C., and the output TMP30 of COMP3
Becomes “1” at 30 ° C. or higher, and becomes “0” at 30 ° C. or lower. Therefore, the CPU reads (A) 3 by reading 3 bits b0 to 2 of the temperature detection IO port in FIG.
0 ° C or higher / (B) 20 ° C to 30 ° C / (C) 10 ° C to 20
It is possible to detect the temperature in four stages of ℃ / (D) 10 ℃ or less.

FIG. 8 is an explanatory view showing a mounting example of the printer device. In this figure, 8 is a printing mechanism unit, which is mounted on the upper surface of the apparatus. The CPU board / print control and driver board 9 is mounted on the lower part of the apparatus.
The thermistor 10 for temperature detection is mounted on a CPU board for the purpose of easy mounting and making it the cheapest. Note that C
Since the transistors on the driver board mounted near the PU board and the motors and magnets of the printing mechanism are heat-generating components, ventilation holes 11 are provided in the housing to take into consideration the cooling effect of natural cooling. There is.

Next, the purpose of providing the temperature detecting function in the printer will be described. The printer device is required to print various types of paper, and it is necessary to print copy paper and the like (for example, in the case of a wire dot type serial printer). When the ink attached to carbon is transferred to the copy paper by applying pressure from the wire dot print head pins, it is difficult to transfer when the ambient temperature is low compared to when the temperature is high. . The wire dot print head is also a device whose impact force is easily affected by temperature.

Therefore, it is necessary to detect the ambient temperature and to intensify the printing impact force when the temperature is low by CPU control as compared with the normal temperature. If the impact force is too strong at room temperature when it is frequently used, it adversely affects the life of the ink ribbon and the wear of the print head. Therefore, it is necessary to control the impact force to be weaker than that at low temperature.

Further, in order to convey the printing paper from the insertion port to the printing position, a certain accuracy for aligning the printing position is required. The mechanism for conveying the paper is composed of a clamp magnet for clamping the paper and a roller connected by a pulse motor controlled by the CPU, but the roller is generally made of rubber or the like and is easily affected by temperature change. It is a property. Therefore, the conveyance accuracy is greatly affected by the roller system, but the property of the roller system changes depending on the ambient temperature, so that there is a difference in the conveyance property between the low temperature and the high temperature. Therefore, by detecting the ambient temperature,
Transport amount at low temperature and high temperature (number of pulse motor steps)
Needs to be corrected by the CPU. In addition, the holding force of magnets is also easily affected by temperature.

From the above, it is very useful that the printer device detects the ambient temperature and the CPU performs control suitable for the temperature.

[0012]

In the conventional device having the above-mentioned structure, the temperature is detected in four stages, which is not sufficient when the control by the finer temperature division is required.
However, when increasing the number of stages of temperature classification, it is necessary to increase the number of parts such as resistors and resistors to create the comparator and reference voltage, and to add ports. This is a heavy burden for mounting high-density components on the board due to the demand for shorter size.

Further, at what temperature the correction is applied, how many stages of temperature detection are required, etc. are often determined by an evaluation test or the like at the final stage of the development of the printer device. At that time, if there is a demand to increase the number of stages of the temperature classification from the current state, it will be necessary to remake the board or change the farm, which will adversely affect the development cost and the delivery time.

FIG. 9 is a graph (1) showing an example of changes in the outside air temperature and the thermistor part temperature after the power is turned on, and shows an example of changes in the outside air temperature and the thermistor part temperature after the power of the printer is turned on. . As can be seen from this figure, after the power is turned on, a difference between the temperature of the thermistor part and the outside air temperature occurs due to the influence of the internal heating device, and it takes a certain time for the difference to saturate to a certain value. Become.
In the example of FIG. 9, the temperature difference is saturated to 8 ° C. in 20 minutes.

FIG. 10 is a flow chart of conventional temperature detection control, showing an example of temperature detection control by a conventional printer device. In this figure, when there is a print command after the power of the printer is turned on, the temperature detection port is read, and if it is 20 ° C. to 30 ° C.,
Considering the difference with the outside temperature, the actual outside temperature is 8 ° C lower than the detected temperature, so 12 ° C to 22 ° C is set, and after making various settings related to temperature correction, the paper is sucked, printed, and fed. -It was necessary to discharge.

However, the print command may be after 20 minutes when the difference between the temperature of the thermistor portion and the outside air temperature is saturated, but before 20 minutes when the difference is saturated, the outside air temperature conversion becomes uncertain, which is unsuitable. You will end up making temperature correction settings. Taking FIG. 9 and FIG. 10 as an example, 5
If a print command comes after a minute, the temperature of the thermistor is 10 to 20 ° C. according to the judgment of the temperature detection port.
There is a drawback in that the temperature correction setting is executed by setting the outside air temperature at 2 ° C to 12 ° C which is 8 ° C lower than that.

[0017]

SUMMARY OF THE INVENTION The present invention is a temperature detecting method and a temperature detecting method for detecting a temperature in the vicinity of a temperature detecting sensor provided in the same housing as a heat generating component that generates heat when power is supplied. In printers with functions, it is assumed that the difference between the ambient temperature outside the housing and the temperature near the temperature detection sensor will be constant after a lapse of a certain time after the power is turned on, and the temperature will be detected before the temperature difference becomes constant. It is characterized in that the ambient temperature outside the housing is detected in consideration of the temperature and the elapsed time from the power-on to the detection.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit block diagram of a printer device showing an example of an embodiment. The printer device of the present embodiment is characterized by having a clock circuit described later. On the memory map of the CPU 1 which is the control unit, a memory group 2 including ROM and RAM in which programs are stored is arranged. Further, the IO port group 3 is arranged on the IO map. A print mechanism unit 4 is connected to the print control circuit 6 via the driver circuit 5.

The CPU 1 controls the print control circuit 6 via the IO port group 3 to perform various controls such as sheet suction, line feed, printing and discharge. The temperature detection circuit 7 is arranged on the IO map as one of the IO ports. A clock circuit 12 counts and holds time, and C
The current time can be read by reading the clock port from PU1.

FIG. 7 is an explanatory diagram showing an example of the temperature detecting circuit. Here, as the temperature detection sensor, the thermistor TH
1 is used. The thermistor is a device whose resistance value changes with temperature. The temperature of the thermistor TH1 used here increases as the temperature decreases,
It exhibits certain characteristics depending on the temperature. The resistance value (x) that changes with temperature is converted into a voltage by connecting to the resistors R1 and 5V.

The voltage V1 which changes with temperature is expressed by the following calculation formula. V1 = 5x / (R1 + x)
[V]. Therefore, V1 gradually increases as the temperature of the thermistor TH1 decreases. The voltage of V1 is 3
The comparators COMP1 to COMP3 compare the output, and the output is BUF (LS244) to CP the IO port.
It can be recognized by U reading.

Reference voltage V2 of COMP1 [= 5 (R3 +
R4 + R5) / (R2 + R3 + R4 + R5)] is the temperature 1
The voltage value converted to 0 ° C, the output TM of COMP1
P10 is “1” at 10 ° C. or higher and “0” at 10 ° C. or lower. Similarly, the reference voltage V3 of COMP2 [= 5
(R4 + R5) / (R2 + R3 + R4 + R5)] is a voltage value converted to a temperature of 20 ° C., and is the output T of COMP2.
MP20 becomes “1” at 20 ° C. or higher and “0” at 20 ° C. or lower.

Further, the reference voltage V4 of COMP3 [4 = 5.
R5 / (R2 + R3 + R4 + R5)] is a voltage value converted to a temperature of 30 ° C., and the output TMP30 of COMP3
Becomes “1” at 30 ° C. or higher, and becomes “0” at 30 ° C. or lower. Therefore, the CPU reads (A) 3 by reading 3 bits b0 to 2 of the temperature detection IO port in FIG.
0 ° C or higher / (B) 20 ° C to 30 ° C / (C) 10 ° C to 20
It is possible to detect the temperature in four stages of ℃ / (D) 10 ℃ or less.

FIG. 8 is an explanatory view showing a mounting example of the printer device. In this figure, 8 is a printing mechanism unit, which is mounted on the upper surface of the apparatus. The CPU board / print control and driver board 9 is mounted on the lower part of the apparatus.
The thermistor 10 for temperature detection is mounted on the CPU board for the purpose of easy mounting and the lowest cost. Note that C
Since the transistors on the driver board mounted near the PU board and the motors and magnets of the printing mechanism are heat-generating components, ventilation holes 11 are provided in the housing to take into consideration the cooling effect of natural cooling. There is.

An example of the operation of this embodiment having the above configuration will be shown below. (Operation Example) FIG. 2 is a temperature detection control flowchart (1) of the embodiment. The difference between the temperature of the thermistor part and the outside air temperature after the power of the printer device is turned on gradually increases due to the influence of the heat-generating components inside, and saturates in a certain time. Considering the example of FIG. 9, the temperature difference becomes saturated in about 20 minutes and reaches 8 ° C.

In the present embodiment, the characteristic before the saturation of the difference between the temperature of the thermistor portion and the outside air temperature is used in reverse. After the mechanical execution (Sa1) after power-on of the printer device, the CPU 1 reads the temperature port for the first time (Sa2), and the temperature information [1] at that time (somewhere in four stages) is stored in a memory such as a RAM. Save to [1] (Sa
3). The temperature information [1] at the first temperature port is the value at the time when the difference with the outside air temperature at that time is still small.

Next, after 10 minutes, the second temperature port is read (Sa4), and the temperature information at that time is stored in the memory.
Save in [2] (Sa5). Second temperature information [2]
Has a difference (h10) of 4 ° C from the outside air temperature at that time, but the temperature difference is not yet saturated. Then, 20 minutes after the power is turned on, the third temperature port is read (Sa
6). In this example, after 20 minutes, the difference between the thermistor temperature and the outside air temperature is already saturated, and the temperature difference (h20) is 8 ° C.
It is. Note that the elapsed time from when the power was turned on is C in FIG.
It can be determined by PU1 reading the IO port of the clock circuit 12.

From the three points of the temperature information after the third temperature port read, the temperature information [1] stored in the memory [1] and the temperature information [2] stored in the memory [2], When the temperature is determined, it is possible to subdivide the temperature into about three times the conventional temperature range. First, if the temperature information after the third temperature port read is 30 ° C. or higher, Sa7-1 and 20 ° C.
Sa7-2 in the case of up to 30 ° C, Sa7-3 in the case of 10 ° C to 20 ° C, and Sa7-4 in the case of 10 ° C or lower.
Then, the processing is branched.

Here, a case where the processing shifts to Sa7-2 will be described as an example. This means that the temperature port lead for the third time was 20 ° C. to 30 ° C., and it is determined that 12 ° C. to 22 ° C. after subtracting the temperature difference 8 ° C. after saturation is the temperature outside the housing. Next, the temperature information [1] stored in the memory [1] is read (Sa8), and the process is branched according to this value (Sa9). When the value of this temperature information [1] was 20 ° C. to 30 ° C. like the value after 20 minutes, it was within the range of 10 ° C. even though the temperature increased by 8 ° C. The temperature outside the body is 20 ° C-22
It can be estimated that the temperature is 0 ° C. (Sa10), and temperature correction and the like are set according to the temperature (Sa11).

In Sa9, the temperature information [1] is 1
In the case of 0 ° C to 20 ° C, the temperature information [2] after 10 minutes is taken in (Sa12), and the process is branched based on this value (S12).
a13). When the value of this temperature information [2] is 10 ° C to 20 ° C, considering that the difference between the temperature of the thermistor part and the outside air temperature is 4 ° C, the outside air temperature can be determined to be 12 ° C to 16 ° C (Sa14 ), And settings such as temperature correction according to the temperature are performed (Sa15). Also, the value of temperature information [2] is 20 ° C.
In the case of -30 ° C, it can be judged as 16 ° C-20 ° C (Sa1
6), settings such as temperature correction according to the relevant temperature are made (S
a17).

As described above, the temperature correction and the like at each temperature are set, and the process waits until a print command is received (Sa1
8) If there is a print command, the temperature port is read again at that time (Sa19), and the result is compared with the temperature port read result 20 minutes after the power is turned on (Sa20). As a result of comparing the values, if there is no difference, the sheet is sucked in / printed / line feed / discharged (Sa21-23), but if there is a difference, it is determined that the outside air temperature has changed, and various temperature information in the memory is determined. The current outside air temperature is analyzed from the above (Sa24), and a difference setting such as an appropriate temperature correction which is determined in advance to that temperature is performed (Sa25), and paper suction, printing, line feed, and discharge operations are performed (Sa21-23). ).

As described above, the temperature detection circuit is provided as it is, and the clock circuit is provided to control the temperature detection circuit. By reading, it is possible to determine the outside air temperature that is subdivided from the current state. In the above description, the number of temperature division steps that can be determined by one temperature port read is four, and the number of reads until the temperature difference is saturated is three. However, this temperature division step and the number of reads are as described above. It is not limited to the example. By increasing the temperature classification step and the number of reads, it is possible to more accurately determine the linear change of temperature.

As described above, since the temperature detection circuit can be a conventional one, even if there is a demand to increase the number of temperature division stages for temperature detection from the current state due to an evaluation test or the like at the final stage of development of the printer device, Since it is not necessary to remake the device, it is possible to satisfy the technical requirements without adversely affecting the development cost and the delivery time. (Operation Example) FIG. 3 is a temperature detection control flowchart (2) of the embodiment.

After the mechanical execution (Sb1) after the power supply of the printer apparatus is turned on, the CPU 1 sets the elapsed time n = 0 (Sb2) and reads the first temperature port (Sb1).
3), RA of temperature information [0] at that time (somewhere in 4 steps)
It is saved in the memory [0] such as M (Sb4). The presence or absence of a print command is determined here (Sb5), and if a print command is received immediately, the outside temperature is determined based on the information in memory [0] (Sb5).
By doing 6), since there is little difference between the temperature of the thermistor part and the outside air temperature, it is possible to make an almost accurate determination and to make an accurate temperature correction setting (Sb7). Following this setting, paper suction, printing, line feed, and discharge operations are performed (Sb
8-10).

If a print command is not received in Sb5, the clock port is always sensed (Sb1
1) The minute advance is monitored (Sb12). For example, when minute advance is performed, the elapsed time n is increased by 1 (minute) by 1 (Sb13), and then the temperature port is read (Sb1).
4) Then, the temperature information [1] one minute later is stored in the memory [1] (Sb15).

Even when the print command does not reach the time (20 minutes) where the temperature difference will be saturated, the above operation is repeated every 1 minute and the temperature information at each time is recorded in the corresponding area of the memory. After saturation, the same control as that of the process A, which is the process after Sa6 in FIG. 2, is performed. Even if a print command is issued within 20 minutes, for example, 8 to 9 minutes, 1 to
By making an approximate calculation (Sb6) based on the values of temperature information [0] to [8] held every 8 minutes, it becomes possible to determine the outside air temperature almost accurately, and the temperature of the thermistor and the outside air temperature. Even before the difference is saturated, it is possible to make almost accurate settings such as temperature correction.

(Example of Operation) Here, the temperature determination in consideration of heat generation due to a mechanical operation such as printing will be described. If printing is performed before the temperature difference between the thermistor and the outside air temperature is saturated, the temperature difference may be saturated until the motor or magnet operates and the drive transistor or magnet motor heats up. Time gets faster.
Further, there is a correlation that the more the number of mechanical operations of the heat generating component increases, the faster the time until the temperature difference becomes saturated.

FIG. 4 is a graph (2) showing a transition example of the thermistor temperature after the power is turned on. The solid line in the figure shows the characteristics when there is no mechanical operation during 20 minutes, and the broken line shows the characteristics when there are 10 mechanical operations during 20 minutes. The solid line shows a temperature difference of 1.5 ° C. after 5 minutes, 4 ° C. after 10 minutes, and 8 ° C. after 20 minutes, which is a characteristic of almost saturation. In the broken line, due to the mechanical operation,
The internal temperature rise is high, and after 5 minutes, it becomes 4 ° C. and after 10 minutes, it becomes 8 ° C., which is almost saturated.

FIG. 5 is a temperature detection control flowchart (3) of the embodiment, and the control in consideration of the factor of the number of mechanical operations affecting the internal temperature rise will be described. Execution of mechanical after powering on the printer (Sc1)
After that, the CPU 1 sets the elapsed time n = 0 (Sc2), reads the first temperature port (Sc3), and outputs the temperature information [0] at that time (somewhere in four stages) to a memory such as a RAM [0].
(Sc4).

Here, the presence or absence of a print command is determined (Sc
5) When a print command is received, the outside air temperature is judged in consideration of the temperature information of the memory and the information of the number of mechanical operations (Sc
6), temperature correction and the like are set (Sc7). Continued
Paper suction, printing, line feed, and discharge operations are performed (Sc8 ~ 1
0), write the latest value of the number of mechanical operations to the memory (Sc
11).

If no print command is sent in Sc5, the clock port is always sensed (Sc1
2) The minute advance is monitored (Sc13). For example, when the minute advance is made, the elapsed time is increased (Sc1).
4) The temperature port is read (Sc15), and the temperature information is stored in the memory (Sc16). Even if the print command does not reach the time (20 minutes) when the temperature difference will be saturated, the above operation is repeated every 1 minute to record the temperature information at that time in the memory, and after the saturation, the temperature information of FIG. The same control as the process A, which is the process after Sa6, is performed.

As described above, when a print command is issued before the temperature difference between the thermistor section and the outside air temperature is saturated, the total number of mechanical operations such as the number of print lines and the number of sheet suctions is recorded in the memory. For example, a more accurate temperature determination can be performed by converting the outside air temperature by assuming the temperature difference characteristic from the temperature information recorded every minute and the information on the number of mechanical operations.

In the description of the above embodiment, the case where the present invention is applied to the temperature detection of the printer device has been described, but the present invention is not limited to this, and the temperature detection sensor exists in the same housing as the heat generating component. The present invention can be similarly applied to temperature detection under the condition.

[0044]

As described above in detail, the temperature is detected even before the temperature difference is saturated, and the temperature is determined based on the temperature information and the information on the elapsed time from the power-on to the detection. Therefore, the temperature outside the housing can be detected more accurately.

Further, there is an effect that the temperature information can be obtained by the stages subdivided by the number of stages of temperature detection determined by the temperature detection circuit or more. Further, there is an effect that accurate temperature detection can be performed even before the temperature difference is saturated. In addition, there is an effect that more accurate temperature detection can be performed by considering the number of operations of the heat generating component.

[Brief description of the drawings]

FIG. 1 is a circuit block diagram of a printer device showing an example of an embodiment.

FIG. 2 is a temperature detection control flowchart (1) of the embodiment.

FIG. 3 is a temperature detection control flowchart (2) of the embodiment.

FIG. 4 is a graph (2) showing a transition example of the outside air temperature and the thermistor part temperature after the power is turned on.

FIG. 5 is a temperature detection control flowchart (3) of the embodiment.

FIG. 6 is a circuit block diagram of a conventional printer device.

FIG. 7 is an explanatory diagram showing an example of a temperature detection circuit.

FIG. 8 is an explanatory diagram showing a mounting example of a printer device.

FIG. 9 is a graph (1) showing a transition example of the outside air temperature and the thermistor temperature after the power is turned on.

FIG. 10 is a conventional temperature detection control flowchart.

[Explanation of symbols]

 1 control unit 2 memory 7 temperature detection circuit 12 clock circuit

Claims (6)

[Claims] 1. In a temperature detecting method for detecting a temperature by a temperature detecting sensor provided in the same housing as a heat-generating component that generates heat when a power supply is supplied, a difference in temperature between the ambient temperature outside the housing and the temperature detecting sensor is the power supply. It is assumed that the temperature will be constant after a lapse of a certain time from the time of turning on, and the temperature is detected at a predetermined time before the temperature difference becomes constant, and the temperature and the elapsed time from power-on to detection are taken into consideration. A method for detecting temperature, comprising detecting an ambient temperature outside the body. 2. A temperature detection sensor for detecting whether a temperature in the vicinity of the temperature detection sensor corresponds to a predetermined temperature division step, by a temperature detection sensor provided in the same housing as a heat-generating component that generates heat when power is supplied. In the method, it is assumed that the temperature difference between the ambient temperature outside the housing and the temperature near the temperature detection sensor becomes constant after a lapse of a certain time after the power is turned on, and temperature detection is performed multiple times before the temperature difference becomes constant. A temperature detecting method, characterized in that the ambient temperature outside the housing is obtained as temperature information subdivided from the temperature division step in consideration of the detected temperature and the elapsed time from power-on to detection. . 3. The temperature near the temperature detecting sensor according to claim 1 and the temperature near the temperature detecting sensor before the temperature difference between the ambient temperature outside the housing and the temperature near the temperature detecting sensor becomes constant. A temperature detection method characterized by detecting the ambient temperature outside the housing from information on the elapsed time from power-on to temperature detection. 4. The method according to claim 1, 2, or 3, wherein the number of times of operation of the heat generating component is recorded, and the greater the number of times of operation, the temperature difference between the temperature near the temperature detection sensor and the ambient temperature outside the housing. A temperature detection method that estimates the ambient temperature in consideration of the fact that the temperature becomes constant faster. 5. A heat-generating component that generates heat when power is supplied, a temperature detection circuit that detects a temperature in the vicinity of a temperature detection sensor provided in the housing at predetermined temperature division stages, a memory that records temperature information, and In a printer device having a temperature detection function consisting of a heat-generating component, a temperature detection circuit, and a control unit that controls a memory, etc., a clock circuit is provided to detect the elapsed time after the power is turned on, and the control unit is used for temperature detection. A printer device having a temperature detecting function, which records temperature information and elapsed time after power-on in a memory, and estimates ambient temperature outside the housing from the temperature information and elapsed time. 6. The temperature detecting function according to claim 5, wherein the control unit records the number of operations of the heat-generating component in a memory, and estimates the ambient temperature outside the housing in consideration of the number of operations. Printer device having a.