JP2010025754A - Mobile electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mobile electronic apparatus capable of correctly and reliably determining the possibility of suffering from a low-temperature burn due to its state of power-on and in a sealed environment such as in a pocket. <P>SOLUTION: By providing a constitution in which a CPU resets a timer every time a digital camera 1 is operated, the absence of operations for a while is detected by time measurement by the timer, and the CPU turns on a temperature sensor TH1 and a temperature sensor TH2 to continue to monitor a first temperature and a second temperature and monitor if they reach a first threshold temperature Tth1 or not. The CPU further acquires a temperature change curve corresponding to a combination of the first temperature and the second temperature when a time value is zero and determines the presence or absence of the possible state of a low-temperature burn in which a temperature on the temperature change curve is lower than a prescribed second threshold temperature when the first temperature has reached the first threshold temperature. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a portable electronic device that generates heat during operation when it is in a power-on state.

  Portable electronic devices such as camera-equipped mobile phones and electronic notebooks have become widespread, and everyone has one. These portable electronic devices operate with power supplied from a battery, and generate heat during operation when the power is on. It is designed to be kept at a constant temperature so that it is cooled and not burned.

  However, some users who own portable electronic devices inadvertently carry the portable electronic devices in their pockets with the power on. Some people accidentally turn on the power switch of a portable electronic device in their pocket.

  Most portable electronic devices are equipped with an auto power off function, so there is no problem, but if the auto power off function does not work, the temperature of the housing in the pocket is expected to be in a sealed environment. The temperature rises more than that. In such a case, there may be only one cloth between the pocket and the human skin, and the portion of the skin in contact with the pocket may suffer low-temperature burns. Although it is an example, when the temperature of a housing | casing has become 44 degreeC, it is said that the skin will be in the state of a low-temperature burn in 6 hours.

  Here, in order to accurately determine whether the portable electronic device is in a pocket and is in a low temperature burn state, the portable electronic device is in contact with the skin of the portable electronic device after being put in a sealed environment such as a pocket. It is necessary to detect whether or not the temperature of the location is a temperature that continuously causes low-temperature burns. Therefore, in Patent Literature 1, when the surface temperature of the casing of the portable electronic device is detected by a sensor, the relationship between time and temperature is graphed to determine whether or not it is a low temperature burn dangerous temperature, and there is a risk of low temperature burn Has proposed a technique for calling attention to the user using sound and display.

However, even if there is no concern about low-temperature burns simply by measuring the temperature in the pocket with the sensor attached to the surface of the housing using the technology of this Patent Document 1, the influence of outside temperature and direct sunlight This may raise the concern that there may be low-temperature burns.
JP 2007-74095 A

  In view of the above circumstances, the present invention provides a portable electronic device that can accurately and reliably determine that there is a concern of low-temperature burns in a power-on state and in a sealed environment such as a pocket. The purpose is to provide.

In order to achieve the above object, a first portable electronic device according to the present invention is a portable electronic device that generates heat during operation when it is in a power-on state.
A first temperature sensor that measures a first temperature that is the temperature inside the portable electronic device;
A second temperature sensor for measuring a second temperature which is a temperature of an environment in which the portable electronic device is placed;
Timekeeping means,
A plurality of combinations of temperature change curves representing temperatures that change with the passage of time from the origin time, which are associated with the combination of the temperature inside the portable electronic device and the temperature of the environment where the portable electronic device is placed. Storage means for storing;
Corresponding to a combination of the first temperature and the second temperature measured by the first temperature sensor and the second temperature sensor at a reference time derived from the last operation time of the portable electronic device Obtaining means for obtaining the obtained temperature change curve;
After the reference time, it is monitored whether the first temperature measured by the first temperature sensor reaches a predetermined first threshold temperature, and the first time when the reference time coincides with the origin time. Whether or not the temperature on the temperature change curve acquired by the acquisition unit at the determination time when the temperature of 1 has reached the first threshold temperature is in a low-temperature burn concern state that is lower than a predetermined second threshold temperature. And a monitoring / determination means for judging.

  According to the first portable electronic device of the present invention, after the reference time derived from the last operation time of the electronic device, the first temperature measured by the first temperature sensor by the monitoring / determination means is It is monitored whether a predetermined first threshold temperature is reached.

  Here, the reference time derived from the last operation time refers to a time when the portable electronic device is assumed to be put in the pocket in a power-on state. For example, if the last operation performed by the user was a shooting operation, the time assumed to be put in the pocket after the operation was performed (for example, a predetermined time has elapsed since the time of the final operation fixedly determined in advance) Time) becomes the reference time derived from the final operation.

  Thus, a reference time at which the portable electronic device is assumed to be put in the pocket is determined, and the temperature rise state of the first temperature after the reference time is monitored by the monitoring / determination means. When monitoring by the monitoring / determination unit is started, one of the plurality of temperature change curves in the storage unit is acquired by the acquisition unit, and the origin of the temperature change curve acquired by the monitoring / determination unit Processing for adjusting the reference time to the time is performed. The temperature change curve in the storage means is a temperature change curve when not in a sealed environment.

  The monitoring / determination means continuously measures the first temperature after the reference time assumed to be put in the pocket by the first temperature sensor, and the first temperature is the first temperature. When the determination time at which the threshold temperature is reached is detected, and the temperature at the determination time on the temperature change curve associated with the first temperature and the second temperature is less than a predetermined second threshold In addition, the first temperature reaches the first threshold temperature faster than the temperature when not in an enclosed environment, and the first temperature is higher than a temperature on the temperature change curve by a predetermined value or more. It is determined that there is a low temperature burn concern state in a sealed environment such as a pocket.

  With such a configuration, the monitoring / determination means can reliably and accurately determine that there is a low-temperature burn concern state only when the portable electronic device is in a sealed environment such as a pocket.

  Here, if the storage means stores too many temperature change curves, the memory capacity of the storage means must be increased. Therefore, the acquisition means acquires and acquires several typical temperature change curves from the storage means. The memory capacity can be reduced by using a configuration in which a necessary temperature change curve is obtained by interpolation using several curves.

The second portable electronic device of the present invention that achieves the above-described object is a portable electronic device that generates heat during operation when in a power-on state.
A first temperature sensor that measures a first temperature that is the temperature inside the portable electronic device;
A second temperature sensor for measuring a second temperature which is a temperature of an environment in which the portable electronic device is placed;
Timekeeping means,
A plurality of combinations of temperature change curves representing temperatures that change with the passage of time from the origin time, which are associated with the combination of the temperature inside the portable electronic device and the temperature of the environment where the portable electronic device is placed. Storage means for storing;
Corresponding to a combination of the first temperature and the second temperature measured by the first temperature sensor and the second temperature sensor at a reference time derived from the last operation time of the portable electronic device Obtaining means for obtaining the obtained temperature change curve;
After the reference time, it is monitored whether the first temperature measured by the first temperature sensor reaches a predetermined threshold temperature, and the first time when the reference time coincides with the origin time. The difference time required from the determination time when the temperature reaches the predetermined threshold temperature to the time when the temperature on the temperature change curve acquired by the acquisition means reaches the predetermined threshold temperature is equal to or greater than the predetermined threshold time It is characterized by comprising monitoring / determination means for determining whether or not there is a low-temperature burn concern state.

  According to the second portable electronic device of the present invention, after the reference time derived from the last operation time of the electronic device, the first temperature measured by the first temperature sensor by the monitoring / determination means is It is monitored whether a predetermined first threshold temperature is reached.

  When monitoring by the monitoring / determination unit is started, one of the plurality of temperature change curves in the storage unit is acquired by the acquisition unit, and the temperature change curve acquired by the monitoring / determination unit is acquired. Processing for adjusting the reference time to the origin time is performed.

  The monitoring / determination means continuously measures the first temperature after the reference time assumed to be put in the pocket by the first temperature sensor, and the first temperature is the first temperature. The determination time at which the threshold temperature is reached is detected, and the difference time required from the determination time to the time at which the temperature on the temperature change curve acquired by the acquisition means reaches the predetermined threshold temperature is not less than the predetermined threshold time. When the first temperature reaches a predetermined threshold temperature faster than when not in the sealed environment, it is determined that there is a low-temperature burn concern in the sealed environment such as a pocket.

  Even in this case, similarly to the first portable electronic device, the monitoring / determination means can reliably and accurately indicate that there is a low-temperature burn concern state only when the portable electronic device is in a sealed environment such as a pocket. It will be judged.

The third portable electronic device of the present invention that achieves the above object is a portable electronic device that generates heat in operation when it is in a power-on state.
A first temperature sensor that measures a first temperature that is the temperature inside the portable electronic device;
A second temperature sensor for measuring a second temperature which is a temperature of an environment in which the portable electronic device is placed;
Timekeeping means,
A plurality of combinations of temperature change curves representing temperatures that change with the passage of time from the origin time, which are associated with the combination of the temperature inside the portable electronic device and the temperature of the environment where the portable electronic device is placed. Storage means for storing;
Corresponding to a combination of the first temperature and the second temperature measured by the first temperature sensor and the second temperature sensor at a reference time derived from the last operation time of the portable electronic device Obtaining means for obtaining the obtained temperature change curve;
It is monitored whether the first temperature measured by the first temperature sensor after the reference time reaches a predetermined threshold temperature, and the first of the first temperature when the threshold temperature is reached. The low temperature burn whose temperature change gradient is greater than the second temperature change gradient of the temperature change curve at the time when the temperature on the temperature change curve acquired by the acquisition means reaches the threshold temperature It is characterized by comprising monitoring / determination means for determining whether or not there is a state of concern.

  According to the third portable electronic device of the present invention, after the reference time derived from the last operation time of the electronic device, the first temperature measured by the first temperature sensor by the monitoring / determination means is It is monitored whether a predetermined threshold temperature is reached.

  When monitoring by the monitoring / determination unit is started, one of the plurality of temperature change curves in the storage unit is acquired by the acquisition unit, and the temperature change curve acquired by the monitoring / determination unit is acquired. Processing for adjusting the reference time to the origin time is performed.

  The monitoring / determination means continuously measures the first temperature after the reference time assumed to be put in the pocket by the first temperature sensor, and the first temperature is the first temperature. Detecting a determination time at which the threshold temperature is reached, calculating a first temperature change gradient at the determination time, and when the temperature on the temperature change curve acquired by the acquisition unit reaches the threshold temperature The change rate of the first temperature is faster than the change rate of the temperature change when the temperature change curve is not in the sealed environment when the temperature change curve is larger than the second temperature change gradient of the temperature change curve at a predetermined threshold gradient or more. It is determined that there is a concern about low-temperature burns in a sealed environment such as a pocket.

  Even in this case, as in the first portable electronic device of the present invention and the second portable electronic device of the present invention, the monitoring / determination means has the portable electronic device in a sealed environment such as a pocket. Only in this case, it is determined reliably and accurately that there is a low-temperature burn concern state.

A fourth portable electronic device of the present invention that achieves the above object is
In portable electronic devices that generate heat during operation when the power is on,
A first temperature sensor that measures a first temperature that is the temperature inside the portable electronic device;
A second temperature sensor for measuring a second temperature which is a temperature of an environment in which the portable electronic device is placed;
Timekeeping means,
Storage means for storing, for a plurality of temperatures, temperature change curves that correspond to the temperature of the environment in which the portable electronic device is placed and that represent temperatures that change with the passage of time from the origin time;
Obtaining means for obtaining a temperature change curve associated with the second temperature measured by the second temperature sensor at a reference time derived from the last operation time of the portable electronic device;
After the reference time, the first temperature measured by the first temperature sensor is monitored, and the first temperature when the reference time coincides with the origin time is acquired by the acquisition unit. And a monitoring / determination unit that determines whether or not a temperature obtained by adding a predetermined threshold difference temperature to a temperature on the temperature change curve is exceeded.

  According to the fourth portable electronic device of the present invention, after the reference time derived from the last operation time of the electronic device, the first temperature measured by the first temperature sensor by the monitoring / determination means is It is monitored whether a predetermined threshold temperature is reached.

  Here, the monitoring / determination means determines that the second temperature at the reference time is sufficiently higher than the first temperature, and the first temperature is influenced by only the second temperature after the reference time. When it is determined that the temperature rises, the acquisition unit acquires one temperature change curve associated with the second temperature from the plurality of temperature change curves in the storage unit and acquires the origin time of the temperature change curve acquired. The process of adjusting the reference time to the above is performed.

  Thus, the monitoring / determination means continuously measures the first temperature after the reference time assumed to be put in the pocket by the first temperature sensor, and the first temperature is obtained as the acquisition means. When it is determined that the temperature of the temperature on the temperature change curve associated with the second temperature obtained by adding the predetermined threshold difference temperature is exceeded, the rate of increase in the first temperature is the sealed environment. If it is faster than the rate of temperature rise when it is not, it is determined that there is a low temperature burn concern in a sealed environment such as a pocket.

  Thus, when the second temperature is sufficiently higher than the first temperature and it is certain that the change in the first temperature is affected only by the second temperature, the fourth portable device of the present invention is used. You may make it a structure like an electronic device.

The fifth portable electronic device of the present invention that achieves the above object is
In portable electronic devices that generate heat during operation when the power is on,
A first temperature sensor that measures a first temperature that is the temperature inside the portable electronic device;
A second temperature sensor for measuring a second temperature which is a temperature of an environment in which the portable electronic device is placed;
Timekeeping means,
Storage means for storing, for a plurality of temperatures, temperature change curves that correspond to the temperature of the environment in which the portable electronic device is placed and that represent temperatures that change with the passage of time from the origin time;
Obtaining means for obtaining a temperature change curve associated with the second temperature measured by the second temperature sensor at a reference time derived from the last operation time of the portable electronic device;
The first temperature measured by the first temperature sensor after the elapse of a predetermined threshold time from the reference time when the reference time coincides with the origin time is on the temperature change curve acquired by the acquisition means. And a monitoring / determination unit that determines whether or not a low-temperature burn concern state exceeds a temperature obtained by adding a predetermined threshold difference temperature to a temperature after a lapse of a threshold time from the origin time.

  In the fifth portable electronic device of the present invention, a predetermined threshold difference temperature is added to the temperature after the threshold time has elapsed from the origin time on the temperature change curve associated with the second temperature acquired by the acquisition means. It is determined whether or not the temperature exceeds the specified temperature.

  For example, when the second temperature is sufficiently lower than the first temperature, even if the portable electronic device is in a power-on state and is put in a pocket, the first temperature does not rise easily.

  For this reason, when the second temperature is sufficiently lower than the first temperature, the monitoring / determination means, after the elapse of a predetermined threshold time from the reference time when the reference time coincides with the origin time, The first temperature measured by the first temperature sensor is a predetermined threshold value on the temperature change curve associated with the second temperature acquired by the acquisition means after the threshold time has elapsed from the origin time. It is sufficient to determine whether or not there is a low-temperature burn concern state that exceeds the temperature that includes the differential temperature.

  Thus, when the second temperature is sufficiently lower than the first temperature and it is certain that the change in the first temperature is affected only by the second temperature, the fifth portable device of the present invention is used. You may make it a structure like an electronic device.

  Here, the first portable electronic device of the present invention, the fourth portable electronic device of the present invention, and the fifth portable electronic device of the present invention may be combined, and the second portable electronic device of the present invention. A device, the fourth portable electronic device of the present invention, and the fifth portable electronic device of the present invention may be combined, and further the third portable electronic device of the present invention and the fourth portable device of the present invention. Electronic device The fifth portable electronic device of the present invention may be combined.

Further, the first to fifth portable electronic devices of the present invention include a vibrator that vibrates the portable electronic device,
In response to the determination that the monitoring / determination means is in the state of concern about the low-temperature burn, it is preferable that the vibrator further includes a vibrator driving unit that drives the vibrator to vibrate the portable electronic device.

  Then, in response to the determination that the monitoring / determination unit is in a state of concern for low-temperature burns, the vibrator drive unit drives the vibrator to vibrate and vibrates the user accurately. You can be notified.

In addition, the monitoring / determination means includes a power limiting means for limiting power supplied to at least a part of the circuit in response to the determination that the low temperature burn is in a state of concern.
The first temperature measured by the first temperature sensor at the time when the monitoring / determination means has passed a predetermined time from the time when the power supply restriction by the power restriction means is performed is a predetermined low-temperature burn. It is determined whether or not it is in a low temperature burn concern continuation state exceeding the threshold temperature,
A vibrator for vibrating the portable electronic device;
It is even better if the monitoring / determination unit further includes a vibrator driving unit that drives the vibrator to drive the portable electronic device when it is determined that the low-temperature burn concern continuation state has been determined. .

  Then, when it is determined by the monitoring / determination means that the low temperature burn is in a state of concern, the vibrator driving means is driven to vibrate the vibrator to notify the user that it is in a low temperature burn state. Measures are taken to avoid the low temperature burn condition by limiting the power supply by the power limiting means.

  Here, after the user takes the above measures, it is conceivable that the low electronic device is put in the pocket again. However, if the pocket is made of a highly heat-insulating material, the first temperature of the portable electronic device after the power is turned off does not drop much, and there is a concern that the low temperature burn concern state may continue.

  In such a case, the monitoring / determination means once cancels the power supply restriction when a predetermined time has elapsed, performs measurement with the first temperature sensor and the second temperature sensor, and enters a low temperature burn continuation state. If it is determined again whether or not it is in the low temperature burn concern continuation state, it may be configured to notify the user of the low temperature burn concern continuation state by the vibration of the vibrator.

  As described above, a portable electronic device is realized that can accurately and reliably determine that there is a risk of low-temperature burns in a power-on state and in a sealed environment such as a pocket.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a diagram showing a digital camera which is an embodiment of the portable electronic device of the present invention.

  As shown in FIG. 1, a lens barrel 110 containing a photographing optical system is provided at the center of the body, and a finder 101 is provided above the lens barrel 110. A flash light emission window 102 is provided next to the viewfinder 101. When the brightness of the object scene is darker than a predetermined brightness, a flash light is emitted through the flash light emission window 102 to perform photographing. It has become. Further, a release button 103, a power switch 104, and a mode dial 105 are provided on the upper surface. Although not shown in the figure, operation elements for designating various menus in the display screen, the shooting mode, the playback mode, and the like are provided on the back side. Further, the digital camera 1 of the present embodiment is provided with a temperature sensor TH2 for measuring the temperature of the environment where the digital camera 1 is placed. The temperature sensor TH2 measures the temperature of the environment where the digital camera 1 is placed.

  FIG. 2 is a diagram showing an internal configuration of the digital camera 1 of FIG.

  Note that the flash light emitting unit is omitted because it is not directly related to the invention.

  The operation of the digital camera 1 according to the present embodiment is comprehensively controlled by the CPU 100. The CPU 100 has a built-in program memory, and a program indicating the operation procedure of the digital camera is written in the program memory. Input operations of the release button 103, the power switch 104, the mode dial 105, and the like are connected to the input unit of the CPU 100. The CPU 100 first receives the power switch 104 and writes the program in the program memory. Therefore, the operation of the digital camera 1 of FIG. 1 is controlled, and processing corresponding to the subsequent operation of the mode dial 105, the release button 103, and the like is executed.

  The imaging unit 111 controlled by the CPU 100 converts the image data to be supplied to the imaging optical system, the imaging element, and the subsequent image processing unit built in the lens barrel 110 of FIG. And a pre-processing unit for performing pre-processing for the purpose. When an on signal of the power switch 104 is supplied to the CPU 100 and a shooting mode signal is further supplied from the mode dial 105, the CPU 100 controls the image pickup unit 111 to start shooting of the image pickup unit 111. 111 starts output of image data.

  An image processing unit 112 is provided in the subsequent stage of the imaging unit 111. The image processing unit 112 receives an output of the image data from the imaging unit 111 and performs a series of image processing processes under the control of the CPU 100. Is executed.

  Before the release button 103 is operated, image data consisting of all pixels is not output from the image sensor provided in the imaging unit 111, and image data in which intermediate pixels among the pixels are appropriately thinned is subjected to image processing. An image based on the image data is displayed as a through image on the display screen of the LCD provided to the display unit 113 after being output to the unit 112 and subjected to display image processing by the image processing unit 112 and supplied to the display unit 113. .

  Here, when the release button 103 is operated, the CPU 100 instructs the imaging unit 111 to output image data of all pixels and supply the image data to the image processing unit 112. The image processing unit 112 receives image data of all pixels from the imaging unit 111, performs image processing for recording, and records the image data subjected to the image processing on the recording medium 114 under the control of the CPU 100.

  The digital camera of FIG. 1 operates as described above.

  Here, the configuration of the portion related to the present invention will be described with reference to FIG.

  The digital camera 1 according to the present embodiment operates by receiving power supplied from the battery BT, and the CPU 100 is always supplied with power from the battery BT. In general, in a power-off state, the CPU 100 is in a so-called standby state and waits for an operation of the power switch 104. When the power switch 104 is operated, the CPU 100 supplies power from the battery BT to the imaging unit 111, the display unit 113, and the like through the switch SW.

  When the user is in the pocket while carrying the power on, the switch SW remains closed and power is supplied to each part from the battery BT. Therefore, the internal temperature of the digital camera 1 in FIG. There is a concern that it will rise and cause low temperature burns to the user.

  At this time, the CPU 100 may operate the auto power off function to turn off the switch SW, but the CPU 100 cannot perform the process when the auto power off function is not set. Therefore, in this embodiment, in such a case, the digital camera 1 measured by the first temperature T1 that is the internal temperature measured by the first temperature sensor TH1 and the second temperature sensor TH2 is used. The CPU 100 vibrates the vibrator Vib based on the second ambient temperature T2 that is placed, thereby notifying the user that there is a low-temperature burn concern state.

  Here, in the present embodiment, it may be erroneously determined that the CPU 100 is in a low-temperature burn concern state even if it is not in the low-temperature burn concern state only with the second temperature sensor TH2 similar to the conventional one. Therefore, in addition to the temperature sensor TH2, a first temperature sensor TH1 that measures the first temperature T1 that is the temperature inside the digital camera 1 is added to determine whether or not there is a low-temperature burn concern state. It is possible to make an accurate determination.

  Further, in the digital camera 1 of the present embodiment, after the digital camera 1 is put in the pocket, the first temperature rises while the first temperature T1 and the second temperature T2 influence each other. As a result, there are a plurality of temperature change curves representing temperatures that change with the passage of time from the origin time and are associated with the combination of the first temperature T1 and the second temperature T2 when placed in the pocket. A table TB recorded for the combination is deployed.

  This temperature change curve is a temperature rise curve of the first temperature when not in an enclosed environment, and the CPU 100 compares the temperature change curve in the table TB with the first temperature sensor TH1. When the rising speed of the temperature T1 of 1 is fast, it is determined that the power is on and the device is in a sealed environment such as a pocket and is in a low temperature burn concern state.

  Here, the user puts the digital camera in the pocket, and the CPU 100 cannot accurately detect the time when the digital camera 1 shown in FIG. 1 is put in the pocket. However, if the time when it is put in the pocket is not known, the CPU 100 cannot accurately determine whether or not it is in the sealed environment by comparing with the temperature change curve when it is not in the sealed environment.

  Therefore, in this embodiment, the CPU 100 is devised so that the CPU 100 can start processing at the reference time, assuming that the reference time derived from the last operation time referred to in the present invention is the time when it is put in a sealed environment such as a pocket. Therefore, I will explain the idea.

  In the digital camera 1 of the present embodiment, the CPU 100, including the power-on operation, resets the timer TM each time the user performs an operation, and refers to the timer value that the operation is not performed for a while. Can be detected. In this way, if the CPU 100 is configured to reset the timer TM each time an operation is performed by the user, the temperature sensor TH1 and the temperature sensor TH2 are set with the timer value 0 as the reference time, which is the final operation time. The temperature measurement curve obtained by measuring the temperature change curve associated with the combination of the temperature T1 and the temperature T2 having the timer value 0 as the origin time is obtained from the table TB. And a temperature change curve in the table TB can be easily compared.

  FIG. 3 is a diagram showing some of the temperature change curves recorded in the table TB.

  FIG. 3 shows a plurality of combinations of temperature change curves representing temperatures that change with the passage of time from the origin time, which are associated with combinations of the first temperature T1 and the second temperature T2. Yes. The horizontal axis of these temperature change curves is time, and the vertical axis is temperature.

  The temperature change curve A shown at the bottom of FIG. 3 is a temperature change curve of the first temperature T1 when the first temperature T1 and the second temperature T2 at the origin time are both 10 ° C. The temperature change curve B above is a temperature change curve of the first temperature T1 when the first temperature T1 at the origin time is 10 ° C. and the second temperature T2 is 30 ° C., and the temperature change curve above it. C is a temperature change curve of the first temperature T1 when the first temperature T1 at the origin time is 30 ° C. and the second temperature T2 is 30 ° C.

  Here, with reference to FIG. 3, an outline of processing of a low temperature burn concern state determination routine executed by the CPU 100 will be described.

  First, when the power is turned on, the CPU 100 resets the timer TM. Thereafter, when the CPU 100 detects that there is no operation for a predetermined time after resetting the timer again when any final operation is performed by the user, the timer TM is reset. Assuming that the time point of the timer value 0 at the time is the reference time stored in the pocket, the CPU 100 measures the first temperature T1 and the first temperature T1 measured by the first temperature sensor TH1 and the second temperature sensor TH2 at the reference time. A temperature change curve B associated with the combination with the temperature T2 of 2 is acquired.

  Then, the CPU 100 acquires the temperature change curve B, executes a process for adjusting the origin time on the temperature change curve B to the reference time, and the first temperature T1 measured by the first temperature sensor TH1 is obtained. Monitoring of the position on the temperature change curve is started. Then, the first temperature T1 is continuously measured every sampling time, and the time when the first temperature T1 reaches the first threshold temperature Tth1 (40 ° C.) is detected.

In FIG. 3, for the sake of easy understanding, a solid line is shown in which the origin time of the temperature curve is combined with the reference time of the measured temperature change curve M. That is, the CPU 100 counts the time of the timer TM. Based on the above, it is monitored whether the temperature T1 measured by the first sensor TH1 at every sampling time rises as the temperature change curve M in FIG. 3 reaches and reaches the first threshold temperature Tth1 over time. Then, when the first temperature T1 reaches the first threshold temperature Tth1, the temperature Tk at the time t1 when the temperature reaches the first threshold temperature Tth1 on the temperature change curve B obtained from the table TB previously. When the temperature Tk referred to is less than a predetermined second threshold value Tth2, for example, less than 35 ° C., the first temperature T1 rises quickly and the pockets and the like are sealed. It is determined that the person is in a space and is in a state of concern for low-temperature burns.

  That is, the CPU 100 draws a rising curve that exceeds the temperature change curve that is not in a sealed environment, and when it is determined that the amount of heat represented by the integrated value with respect to the time of the temperature change curve tends to increase, it is in a state of concern for low-temperature burns. Judgment.

In the present embodiment, an example of the monitoring / determination means according to the present invention and an example of the acquisition means according to the present invention are configured by the CPU 100, and an example of the recording means according to the present invention is configured by the table TB which is a memory. Yes.
With such a configuration, it is accurately and reliably determined that there is a concern that the user may suffer low-temperature burns because the digital camera is in a sealed space such as a pocket.

  As described above, a portable electronic device is realized that can accurately and reliably determine that there is a risk of low-temperature burns in a power-on state and in a sealed environment such as a pocket.

  FIG. 4 is a diagram for explaining the second embodiment.

  It is assumed that the digital camera 1 having the configuration shown in FIGS. 1 and 2 is also used in the second embodiment.

  In 1st Embodiment, the structure which determines with the digital camera 1 having a concern of a low-temperature burn by having shown that it is in sealed space, such as a pocket, and 1st temperature is higher than the temperature when it is not in sealed space was shown. However, the CPU 100 may compare not the temperature but the time.

  In the second embodiment, as shown in FIG. 4, the CPU 100 that constitutes an example of the monitoring / determination means according to the present invention has a predetermined first temperature T1 measured by the first temperature sensor TH1 after the reference time. From the determination time t1 when the first temperature T1 has reached the predetermined threshold temperature Tth when the reference time coincides with the origin time of the temperature change curve. It is determined whether or not there is a low-temperature burn concern state in which the difference time Δt required until time t2 when the temperature on the temperature change curve B reaches the predetermined threshold temperature Tth is a predetermined threshold time, for example, 5 minutes or more. That is, the CPU 100 determines that the first temperature T1 reaches the threshold temperature Tth faster than the time when it is not in the sealed space, and is in the sealed space and is in a state of concern for low-temperature burns. Even if it is such a structure, the effect similar to 1st Embodiment is acquired.

  FIG. 5 is a diagram for explaining the third embodiment.

  It is assumed that the digital camera 1 having the configuration shown in FIGS. 1 and 2 is also used in the third embodiment.

  In the third embodiment, the temperature change gradient at the time when the CPU 100 reaches the threshold temperature on the measured temperature curve of the first temperature T1 measured by the temperature sensor TH1, and the acquired threshold on the temperature change curve B. The temperature change gradient at the time when the temperature is reached is obtained and compared.

  As shown in FIG. 5, the CPU 100 determines that the first temperature change gradient D1 when the first temperature T1 measured by the first sensor TH1 reaches a predetermined threshold temperature Tth is on the temperature change curve B. When the first temperature T1 is larger than the second temperature change gradient D2 at the time when the first temperature T1 reaches the predetermined threshold temperature Tth, the digital camera has the fact that the rising speed of the first temperature is faster than when the first temperature T1 is not in the sealed environment. It is determined that 1 is in a sealed space such as a pocket and is in a state of concern for low-temperature burns.

  The configuration of the third embodiment can provide the same effects as those of the first and second embodiments.

  FIG. 6 is a diagram for explaining the fourth embodiment.

  FIG. 6 is a view similar to FIGS. 3, 4, and 5.

  If the second temperature T2, which is the ambient temperature where the portable electronic device is placed, is sufficiently higher than the first temperature T1 measured by the temperature sensor TH1, the second temperature T2 is the internal temperature of the digital camera. The temperature of 1 is strongly influenced only by the second temperature and rises. Therefore, rather than using the temperature change curve associated with the first temperature T1 and the second temperature T2 as in the first to third embodiments, it is associated with the second temperature T2. It is better to use the obtained temperature change curve.

  That is, when the second temperature T2 is sufficiently higher than the first temperature T1, the CPU 100 sets the first temperature T1 measured by the first temperature sensor TH1 after the reference time as shown in FIG. When the reference time is monitored and the reference time coincides with the origin time, the first temperature T1 adds a predetermined threshold difference temperature ADD to the temperature on the temperature change curve C associated with only the second temperature. If it is determined that there is a low-temperature burn concern state when the temperature exceeds the specified temperature, a more accurate determination can be made.

  FIG. 7 is a diagram for explaining the fifth embodiment.

  As shown in FIG. 7, when the second temperature T2 is sufficiently lower than the first temperature T1 and the power is turned off and placed in the pocket, the first temperature is changed as shown in the temperature change curve M2. When T1 decreases, there is no concern about a low temperature burn concern state. Further, even if the power supply is in the on state, a considerable time is required until the threshold temperature Tth1 is reached as in the temperature change curve M1 shown in FIG.

  Therefore, if the CPU 100 determines that the second temperature T2 is sufficiently lower than the first temperature T1, the CPU 100 acquires a temperature rise curve C1 of the first temperature T1 associated with the second temperature T2. The first temperature T1 after a predetermined threshold time (30 minutes) is a temperature obtained by adding a predetermined threshold difference temperature ΔT to the temperature T30 after the threshold time has elapsed from the origin time on the acquired temperature change curve C1. It is determined whether or not the state is exceeded.

  Even if it is such a structure, the effect similar to 1st Embodiment, 2nd Embodiment, 3rd Embodiment, and 4th Embodiment is acquired.

  FIG. 7 also shows the temperature change curve C (temperature change curve of the first temperature at the second temperature of 30 ° C.) shown in FIG. 6 in order to show that the temperature is low.

  Here, in the above-described embodiment, a configuration has been described in which the vibrator Vib is vibrated to alert the user when there is a concern about low-temperature burns when the power is turned on and put in the pocket. The vibration of the vibrator Vib has been described. When the user turns off the power and reinserts it into the pocket, if the pocket is made of a highly heat-insulating material, the low temperature burn concern will continue even after the power is turned off due to the heat retaining effect. There is a risk. That is, even if the CPU 100 executes the processing described with reference to FIGS. 3 to 7 and vibrates the vibrator Vib to prompt the user to perform a power-off operation and cause the user to perform the power-off operation, the pocket has high heat retention. If it is made of a material, the digital camera 1 after being turned off may be in a state of concern about low-temperature burns.

  8 and 9 are diagrams for explaining the sixth embodiment.

  FIG. 8 shows an internal configuration of the digital camera 1 in which the relay RL1 is added to the configuration of FIG. 2, and FIG. 9 shows a flowchart showing a processing procedure executed by the CPU 100 of FIG. Yes.

  FIG. 8 has the same configuration as that of FIG. 2 except that a relay RL1 is added.

  If the switch SW is opened while the CPU 100 is in a low temperature burn concern state, power from the battery BT is not supplied to the timer TM.

  Therefore, in this embodiment, when the relay RL1 is added and the switch SW as the power limiting means is opened, only the timer TM can be continuously operated by bringing the relay RL1 into the contact state. In this way, even after the switch SW is opened, the CPU 100 can continue the time measurement by operating the timer TM.

  In this way, with the timer TM activated, the CPU 100 restarts the switch SW when the timer value by the timer TM reaches a predetermined value, and re-measures the temperature with the temperature sensor TH1 and the temperature sensor TH2. I have to.

  That is, when the CPU 100 first determines that there is a low-temperature burn concern state, the vibrator Vib is activated, and then the switch SW is opened and the relay RL1 is connected to limit the power supplied to the circuit parts other than the timer TM. After avoiding the low temperature burn concern state, after a predetermined time has passed, the switch SW is brought into contact again, and the first temperature T1 measured by the first temperature sensor TH1 at that time is the predetermined low temperature burn. It is determined whether or not the low temperature burn concern continuation state exceeds the threshold temperature Tth, and when it is determined that the low temperature burn concern continuation state is detected, the vibrator Vib is driven to vibrate the vibrator Vib and the low temperature burn concern continuation is continued. It is configured to notify the user that it is in a state.

  In such a configuration, in addition to notifying that the low temperature burn is in a state of concern for low temperature burns, if the pocket is made of a highly heat-insulating material and the low temperature burn concern continued state continues, the vibrator Vib is vibrated to allow the user to vibrate. It can also be notified that the low temperature burn concern continuation state.

  A procedure of processing executed by the CPU 100 will be described with reference to FIG.

  First, in step S901, the CPU 100 determines whether or not the digital camera is in a sealed environment such as a pocket as described with reference to FIG. 3, and the first temperature T1 measured by the first temperature sensor TH1 is low-temperature burn. Judgment is made using the temperature on the temperature change curve when the temperature of concern is reached. If it is determined in step S901 that there is no sealed environment, the process proceeds to No and the process of this flow ends.

  When it is determined in step S901 that the device is in a sealed environment such as a pocket, the process proceeds to the next step S902, where it is further determined that there is a low temperature burn concern state. In the above-described example, the CPU 100 executes the processes in steps S901 and S902 almost simultaneously.

  When it is determined in step S902 that there is a concern of low temperature burn, the process proceeds to the next step S903, where the switch SW is opened and the relay RL1 is connected to limit power supply to circuits other than the timer TM. In the next step S904, it is determined whether or not a predetermined time, for example, 5 minutes has elapsed. If 5 minutes have not elapsed, step S904 is repeated, and if 5 minutes have elapsed, the process proceeds to step S905. When the switch SW is connected in step S905 to supply power to each circuit and the temperature sensor TH1 and the temperature sensor TH2 are used to determine whether or not the low temperature burn concern continuation state is present, and the low temperature burn concern continuation state is not established The process of this flow is finished. When it is determined in step S905 that the low temperature burn concern continuation state is reached, the vibrator Vib is driven and the vibrator Vib is vibrated in step S906 to notify the user that the low temperature burn concern continuation state is present.

  When the CPU 100 executes the processing of this flow, for example, it is accurately and reliably determined that the digital camera is carried in a pocket made of a highly heat-insulating material and is in a state of concern about low-temperature burns. The user can be urged.

  As described above, a portable electronic device is realized that can accurately and reliably determine that there is a risk of low-temperature burns in a power-on state and in a sealed environment such as a pocket.

It is a figure which shows the digital camera which is one Embodiment of the portable electronic device of this invention. It is a figure which shows the structure inside the digital camera of FIG. It is the figure which extracted some of the temperature change curves currently recorded on table TB. It is a figure explaining 2nd Embodiment. It is a figure explaining 3rd Embodiment. It is a figure explaining 4th Embodiment. It is a figure explaining 5th Embodiment. It is a figure explaining 6th Embodiment. It is a figure explaining 6th Embodiment.

Explanation of symbols

1 Digital camera 100 CPU
111 Imaging unit 112 Image processing unit 113 Display unit 114 Recording medium TH1 TH2 Temperature sensor TM Timer Vib Vibrator BT Battery RL1 Relay

Claims (7)

In portable electronic devices that generate heat during operation when the power is on,
A first temperature sensor that measures a first temperature that is the temperature inside the portable electronic device;
A second temperature sensor for measuring a second temperature which is a temperature of an environment in which the portable electronic device is placed;
Timekeeping means,
A plurality of combinations of temperature change curves representing temperatures that change with the passage of time from the origin time, which are associated with the combination of the temperature inside the portable electronic device and the temperature of the environment where the portable electronic device is placed. Storage means for storing;
Corresponding to a combination of the first temperature and the second temperature measured by the first temperature sensor and the second temperature sensor at a reference time derived from the last operation time of the portable electronic device Obtaining means for obtaining the obtained temperature change curve;
After the reference time, it is monitored whether the first temperature measured by the first temperature sensor reaches a predetermined first threshold temperature, and when the reference time coincides with the origin time, Whether the temperature on the temperature change curve acquired by the acquisition unit at the determination time when the first temperature reaches the first threshold temperature is in a low-temperature burn concern state in which the temperature is lower than a predetermined second threshold temperature. A portable electronic device comprising monitoring / determination means for determining whether or not. In portable electronic devices that generate heat during operation when the power is on,
A first temperature sensor that measures a first temperature that is the temperature inside the portable electronic device;
A second temperature sensor for measuring a second temperature which is a temperature of an environment in which the portable electronic device is placed;
Timekeeping means,
A plurality of combinations of temperature change curves representing temperatures that change with the passage of time from the origin time, which are associated with the combination of the temperature inside the portable electronic device and the temperature of the environment where the portable electronic device is placed. Storage means for storing;
Corresponding to a combination of the first temperature and the second temperature measured by the first temperature sensor and the second temperature sensor at a reference time derived from the last operation time of the portable electronic device Obtaining means for obtaining the obtained temperature change curve;
After the reference time, it is monitored whether the first temperature measured by the first temperature sensor reaches a predetermined threshold temperature, and the first time when the reference time coincides with the origin time. The difference time required from the determination time when the temperature reaches the threshold temperature to the time when the temperature on the temperature change curve acquired by the acquisition means reaches the first threshold temperature is a low temperature that is equal to or greater than a predetermined threshold time A portable electronic device comprising: a monitoring / determination unit that determines whether or not there is a burn concern state. In portable electronic devices that generate heat during operation when the power is on,
A first temperature sensor that measures a first temperature that is the temperature inside the portable electronic device;
A second temperature sensor for measuring a second temperature which is a temperature of an environment in which the portable electronic device is placed;
Timekeeping means,
A plurality of combinations of temperature change curves representing temperatures that change with the passage of time from the origin time, which are associated with the combination of the temperature inside the portable electronic device and the temperature of the environment where the portable electronic device is placed. Storage means for storing;
Corresponding to a combination of the first temperature and the second temperature measured by the first temperature sensor and the second temperature sensor at a reference time derived from the last operation time of the portable electronic device Obtaining means for obtaining the obtained temperature change curve;
It is monitored whether the first temperature measured by the first temperature sensor after the reference time reaches a predetermined threshold temperature, and the first of the first temperatures at the time when the threshold temperature is reached. The low temperature burn whose temperature change gradient is greater than the second temperature change gradient of the temperature change curve at the time when the temperature on the temperature change curve acquired by the acquisition means reaches the threshold temperature. A portable electronic device comprising: a monitoring / determination unit that determines whether or not there is a state of concern. In portable electronic devices that generate heat during operation when the power is on,
A first temperature sensor that measures a first temperature that is the temperature inside the portable electronic device;
A second temperature sensor for measuring a second temperature which is a temperature of an environment in which the portable electronic device is placed;
Timekeeping means,
Storage means for storing, for a plurality of temperatures, temperature change curves that correspond to the temperature of the environment in which the portable electronic device is placed and that represent temperatures that change with the passage of time from the origin time;
Obtaining means for obtaining a temperature change curve associated with the second temperature measured by the second temperature sensor at a reference time derived from the last operation time of the portable electronic device;
After the reference time, the first temperature measured by the first temperature sensor is monitored, and the first temperature when the reference time coincides with the origin time is acquired by the acquisition unit A portable electronic device comprising monitoring / determination means for determining whether or not a temperature obtained by adding a predetermined threshold difference temperature to a temperature on a temperature change curve is exceeded. In portable electronic devices that generate heat during operation when the power is on,
A first temperature sensor that measures a first temperature that is the temperature inside the portable electronic device;
A second temperature sensor for measuring a second temperature which is a temperature of an environment in which the portable electronic device is placed;
Timekeeping means,
Storage means for storing, for a plurality of temperatures, temperature change curves that correspond to the temperature of the environment in which the portable electronic device is placed and that represent temperatures that change with the passage of time from the origin time;
Obtaining means for obtaining a temperature change curve associated with the second temperature measured by the second temperature sensor at a reference time derived from the last operation time of the portable electronic device;
The temperature change curve acquired by the acquisition means is the first temperature measured by the first temperature sensor after a predetermined threshold time has elapsed from the reference time when the reference time coincides with the origin time. And a monitoring / determination unit that determines whether or not there is a low-temperature burn concern state that exceeds a temperature obtained by adding a predetermined threshold difference temperature to a temperature after the threshold time has elapsed from the origin time. Mobile electronic devices. A vibrator for vibrating the portable electronic device;
The vibrator / drive means for driving the vibrator to vibrate the portable electronic device when the monitoring / determination means determines that the low-temperature burn is in a state of concern. The portable electronic device according to 1 to 5. In response to the determination that the monitoring / determination unit is in the state of concern about low-temperature burns, the apparatus includes a power limiting unit that limits power supplied to at least some circuit portions.
The first temperature measured by the first temperature sensor at the time when the monitoring / determination means has passed a predetermined time from the time when the power supply restriction by the power restriction means is performed is a predetermined low-temperature burn. It is determined whether or not it is in a low temperature burn concern continuation state exceeding the threshold temperature,
A vibrator for vibrating the portable electronic device;
And a vibrator driving unit that drives the vibrator to drive the portable electronic device when the monitoring / determination unit determines that the low-temperature burn concern continuation state has been determined. Item 6. The portable electronic device according to any one of Items 1 to 5.

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