JP2006184129A - Device for detecting internal temperature - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for detecting an internal temperature, capable of making up a mechanism inexpensively to detect a temperature of the inside of an apparatus and accurately detecting the temperature of the inside of the apparatus. <P>SOLUTION: The device for detecting the internal temperature comprises; a thermistor sensor 14 which is disposed on a main substrate 2 having a heat emitting element and used as a temperature detecting means for detecting the temperature inside the apparatus wherein the substrate is disposed; a timer means which measures the elapsed time from a power-on timing of the main substrate 2; and a temperature compensating means which compensates the temperature detected by the sensor by using a temperature compensation table for example, based on the time measured by the timer means. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an internal temperature detection device that detects a temperature inside the device.

  For example, a motor of a receipt transport unit mounted on a receipt printer device used for a POS terminal may have a small torque at a low temperature and may not be able to transport a receipt. For this reason, at low temperatures, it is necessary to slow down the rotational speed of the motor so as to increase the torque. Specifically, even if the receipt printer device has a guaranteed operating temperature of 5 ° C or higher and the temperature at power-on is lower than 5 ° C, the paper is transported even if printing is immediately performed. It may not be done.

  Thus, in order to change the torque of the motor in accordance with the temperature inside the receipt printer apparatus, it is necessary to detect the temperature inside the receipt printer apparatus. In order to detect the internal temperature, an internal temperature detection device in which a sensor for detecting internal temperature is provided in the device is known. This internal temperature detector is equipped with a sensor and connector on a dedicated board, and this dedicated board is connected to the main board on which a CPU, memory, connector, etc. are connected with a harness to detect the internal temperature. It is configured to do.

  When the dedicated board as described above is not used, the sensor is directly soldered to the main board.

A technique is known in which a sensor is provided in the apparatus to detect an applied voltage value during printing by a thermal head (see, for example, Patent Document 1).
JP 2000-326539 A

  However, if a dedicated substrate for the sensor is provided separately from the main substrate, there is a problem that the cost increases.

  If the sensor for detecting the internal temperature is soldered directly to the main board, the heat generated from the CPU, memory, etc. of the main board is transmitted to the sensor via the main board, and the accurate internal temperature of the device is There is a problem that it cannot be detected. In order to avoid this, it is conceivable to use a lead type sensor floating from the main board, but the number of mounting steps increases, leading to high costs.

  The present invention has been made in view of the above problems, and an object of the present invention is to construct a mechanism for detecting the temperature inside the apparatus at a low cost and to detect the temperature inside the apparatus accurately. The object is to provide a temperature detection device.

  The present invention is provided on a substrate having an element that generates heat, and is a sensor that is a temperature detection unit that detects the temperature inside the apparatus in which the substrate is disposed, and a time measuring unit that measures the time from power ON of the substrate, Temperature correction means for correcting the temperature detected by the sensor using, for example, a temperature correction table based on the time measured by the time measuring means.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to construct | assemble the mechanism which detects the temperature inside an apparatus cheaply, the internal temperature detection apparatus which can detect the temperature inside an apparatus correctly can be provided.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram schematically showing a main part of the internal configuration of the receipt printer apparatus 1.

  The receipt printer apparatus 1 is provided with a main substrate 2, a thermal head 3, and a receipt transport unit 4. The main board 2 is fixedly disposed at a predetermined position inside the receipt printer apparatus 1 and is provided with a control unit for controlling the thermal head 3, the motor 5 and the like provided in the receipt printer apparatus 1. For example, when the receipt printer apparatus 1 is mounted on a POS, the thermal head 3 performs printing based on print data sent from the POS main body. The receipt transport unit 4 transports, for example, a paper sheet as a receipt to a printable position by the thermal head 3 using the motor 5 as a drive source.

  FIG. 2 is a diagram schematically showing the configuration of the control unit of the main board 2. The main board 2 is mounted with a CPU 11, a memory 12, and an oscillator 13, which are elements that generate heat, and a thermistor sensor 14 (temperature detection means) that is a surface-mounted product. The CPU 11, the memory 12, and the oscillator 13 are connected via a bus line.

  The CPU 11 is a central processing unit, and the memory 12 stores various data such as a control program executed by the CPU 11 and a temperature correction table T described later with reference to FIGS. 3 and 4. The oscillator 13 supplies a predetermined reference clock to the CPU 11 and the memory 12. The thermistor sensor 14 detects the temperature inside the receipt printer apparatus 1 and transmits the detected temperature information to the CPU 11.

  FIG. 3 is a diagram showing the relationship between the temperature detected by the thermistor sensor 14, the external environmental temperature, and the internal temperature (inside air temperature) of the receipt printer apparatus 1. In FIG. 3, the vertical axis indicates the temperature, the horizontal axis indicates the time elapsed from the power-on of the main board 2, the detected temperature detected by the thermistor sensor 14 is T1, the external environmental temperature is T2, and the receipt printer apparatus. The internal temperature of 1 is indicated by T3. The main board 2 is supplied with power and turned on when the power switch of the receipt printer 1 is turned on.

  When the main board 2 is powered on, the internal temperature T3 is equal to the detected temperature T1. However, as time passes, the environmental temperature T2 is constant, but the detected temperature T1 and the internal temperature T3 rise, and the detected temperature T1 increases more rapidly than the internal temperature T3. This is because the detected temperature T1 is affected by the main substrate 2 being warmed because the thermistor sensor 14 operates with the CPU 11 and the memory 12 supplied with the clock from the oscillator 13.

  The temperature correction table T shown in FIG. 4 is obtained from the relationship between the detected temperature T1 detected in this way and the internal temperature T3. The temperature correction table T is a table for correcting the detected temperature T1 detected by the thermistor sensor 14 to the corrected internal temperature T4 with respect to the elapsed time.

  As shown in FIG. 4, a correction temperature for subtracting an amount higher than the internal temperature T3 from the detected temperature T1 detected by the thermistor sensor 14 is set as time elapses from when the main board 2 is turned on. Yes. Specifically, in the temperature correction table T, the elapsed time is divided into four time segments, from when the power is turned on (that is, 0 minutes) to 10 minutes, from 10 minutes to 20 minutes, from 20 minutes to 30 minutes, and more than 30 minutes. The correction temperatures are set to 1 ° C., 2 ° C., 3 ° C., and 4 ° C. corresponding to the time division. Note that these time divisions and correction temperatures are determined based on the results of testing.

  Next, a process for correcting the detected temperature T1 detected by the thermistor sensor 14 using the correction temperature set in the temperature correction table T to obtain the corrected internal temperature T4 will be described.

  When the CPU 11 detects that the main board 2 is powered on, it starts measuring time using the memory 12 or the like (time measuring means). Then, the CPU 11 detects the corrected internal temperature T4 by subtracting 1 ° C. from the detected temperature T1 detected by the thermistor sensor 14 until 10 minutes from the start of timing, and detects by the thermistor sensor 14 until 20 minutes after 10 minutes. The detected internal temperature T4 is subtracted by 2 ° C from the detected temperature T1, and after 30 minutes, the corrected internal temperature T4 is detected by subtracting 3 ° C from the detected temperature T1 detected by the thermistor sensor 14 until 30 minutes. When this is done, the corrected internal temperature T4 is detected by subtracting 4 ° C. from the detected temperature T1 detected by the thermistor sensor 14 (temperature correction means).

  Next, a process in which the CPU controls the torque of the motor 5 using the corrected internal temperature T4 will be described.

  For example, when the guaranteed operating temperature of the receipt printer apparatus 1 is 5 ° C. or higher, the internal temperature may become 5 ° C. or lower depending on the grounding location or season of the receipt printer apparatus 1. In this case, the torque of the motor 5 becomes small, and the receipt paper may not be transported. Therefore, when the corrected internal temperature T4 corrected is lower than 5 ° C., the CPU 11 normally sets the rotation speed of the motor 5 according to the corrected internal temperature T4 (when the operation is guaranteed to be 5 ° C. or higher). (Torque control means).

  The operation when power is turned on to the receipt printer apparatus 1 configured as described above will be described.

  A corrected internal temperature T4 is detected by subtracting the correction temperature set in the temperature correction table T from the detected temperature T1 detected by the thermistor sensor 14 mounted on the main board 2 according to the time elapsed since the power is turned on. Specifically, for example, if 5 ° C. is detected by the thermistor sensor 14 and within 10 minutes after the power is turned on, 1 ° C. is subtracted from 5 ° C. as the correction temperature, and 4 ° C. is set as the correction internal temperature T 4. Detected. When the guaranteed operating temperature of the receipt printer apparatus 1 is 5 ° C. or higher and 4 ° C. is obtained as the corrected internal temperature T4 as described above, the rotational speed of the motor 5 is set according to the corrected internal temperature 4 ° C. The receipt can be immediately conveyed to a position where printing can be performed by the thermal head 3 even if the torque is increased by slowing down and the temperature is below the operation guarantee temperature of the motor 5.

  Therefore, according to the receipt printer apparatus 1, even if the temperature is detected by the thermistor sensor 14 surface-mounted on the main board 2, the temperature detected by the thermistor sensor 14 as the time elapses from when the power is turned on is changed to the temperature correction table. By subtracting the correction temperature set to T to obtain the correction internal temperature T4, the temperature inside the receipt printer apparatus 1 can be accurately obtained.

  Further, since the thermistor sensor 14 is surface-mounted on the main board 2 and does not have to use a board dedicated to the thermistor sensor 14, a mechanism for detecting the temperature in the receipt printer apparatus 1 at a low cost can be constructed. .

  Further, since the temperature in the receipt printer apparatus 1 can be accurately detected by obtaining the corrected internal temperature T4, the corrected internal temperature T4 is a temperature lower than the operation guarantee temperature of the motor 5 of the receipt transport unit 4. However, according to the corrected internal temperature T4, the rotational speed of the motor 5 is decreased to increase the torque, and the receipt can be immediately conveyed to a position where the thermal head 3 can print.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying constituent elements without departing from the scope of the invention in the implementation stage.

The figure which shows schematically the principal part of the internal structure of the receipt printer apparatus in embodiment of this invention. The figure which shows schematically the structure of the control part of the main board | substrate in the embodiment. The figure which shows the relationship between the detected temperature in the same embodiment, environmental temperature, and internal temperature. The figure which shows the temperature correction table in the same embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Receipt printer apparatus, 2 ... Main board | substrate, 3 ... Thermal head, 4 ... Receipt conveyance part, 5 ... Motor, 11 ... CPU, 12 ... Memory, 13 ... Oscillator, 14 ... Thermistor sensor, T ... Temperature correction table, T1 ... detected temperature, T2 ... environment temperature, T3 ... internal temperature, T4 ... corrected internal temperature

Claims (2)

A temperature detecting means provided on a substrate having an element that generates heat, and detecting a temperature inside the apparatus in which the substrate is disposed;
A time measuring means for measuring time from power ON of the substrate;
An internal temperature detecting device comprising: a temperature correcting means for correcting the temperature detected by the temperature detecting means based on the time measured by the time measuring means. The apparatus has a motor that reduces torque when the temperature in the apparatus decreases in order to drive a driving unit provided therein,
2. The internal temperature detection device according to claim 1, further comprising torque control means for controlling the rotational speed of the motor so as to increase the torque based on the temperature corrected by the temperature correction means.

Images