JP2018094802A - Electronic apparatus, method for controlling cooling fan in the electronic apparatus, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such a problem that existing cooling fan control needs a temperature sensor corresponding to each heat generator to be installed, and which leads to cost increase.SOLUTION: An electronic apparatus including a plurality of heat generators and a cooling fan counts the time of executing a job and, when transitions to a standby state after the execution of the job is finished, if the counted time is longer than prescribed time, controls the cooling fan to rotate for first time irrespective of temperature detected by a temperature sensor installed corresponding to a predetermined heat generator.SELECTED DRAWING: Figure 6

Description

  The present invention relates to an electronic device, a method for controlling a cooling fan in the electronic device, and a program.

  In recent years, in image forming apparatuses such as copying machines and printers, the size of devices has been reduced, and the heat inside the devices has increased accordingly. On the other hand, there is a strong request from the user to reduce the noise of the device, and when the image is not being formed as in the power saving state (sleep state or standby state), the cooling fan should not be rotated as much as possible. Fan control is required.

  On the other hand, various types of data are stored in an external storage device such as a hard disk (hereinafter referred to as HDD), but a redundant disk array such as RAID (Redundant Array of Independent Inexpensive Disks) is used to protect the stored data. Has been. In that case, since a plurality of disk drives are used, the amount of heat generated in the apparatus increases, and the space in the housing decreases, so the temperature conditions become more severe.

  Under such circumstances, for example, Patent Document 1 describes that in an information processing apparatus having a plurality of heating elements, the number of rotations of a cooling fan is controlled according to the measured temperature of each heating element. This technique is applied when there are a plurality of heating elements and the cooling fans do not correspond one-to-one with each heating element.

JP 2006-330913 A

  In the cooling fan control technique described in Patent Document 1 described above, it is necessary to provide a temperature sensor corresponding to each heating element, resulting in an increase in cost. In particular, as in the image forming apparatus, when the heat generation in the apparatus differs greatly between the job execution state and the standby state, there are the following problems. The same standby state occurs when the job transitions to the standby state after a long run, and when there is no job execution state or when the job transitions to the standby state after executing the job for only a short time. However, the situation of heat generation inside the device is completely different. Therefore, it is necessary to control the cooling fan not only based on the state of the apparatus but also based on temperature detection by a temperature sensor corresponding to each heating element. Further, the cooling fan control technique described in Patent Document 1 does not take into consideration the case where the configuration of the heating element in the housing is changed, such as adding an HDD or an option board in the housing of the image forming apparatus. For this reason, there is a problem that the fan control cannot be changed in accordance with the change in the configuration of the heating element inside the housing.

  An object of the present invention is to solve the above-described problems of the prior art.

  The objective of this invention is providing the technique which can suppress the temperature rise inside an apparatus, without providing a temperature sensor corresponding to each heat generating body.

In order to achieve the above object, an electronic device according to one embodiment of the present invention includes the following configuration. That is,
An electronic device including a plurality of heating elements and a cooling fan,
A temperature sensor provided corresponding to a predetermined heating element;
A time measuring means for measuring the time when the job is executed;
When the execution of the job is finished and the state is shifted to the standby state, if the time counted by the time measuring means is a predetermined time or more, the cooling fan is set to the first time regardless of the temperature detected by the temperature sensor, Control means for controlling to rotate.

  According to the present invention, it is possible to suppress an increase in temperature inside the apparatus without newly adding a temperature sensor, and it is also possible to suppress noise due to the rotation of the cooling fan.

  Other features and advantages of the present invention will become apparent from the following description with reference to the accompanying drawings. In the accompanying drawings, the same or similar components are denoted by the same reference numerals.

The accompanying drawings are included in the specification, constitute a part thereof, show an embodiment of the present invention, and are used together with the description to explain the principle of the present invention.
1 is a diagram of an image forming apparatus according to a first embodiment of the present invention viewed from the right side and the back side. 1 is a block diagram illustrating a hardware configuration of an image forming apparatus according to Embodiment 1 of the present invention. 2 is a diagram of a substrate on which a controller of the image forming apparatus according to the first embodiment is mounted as viewed from the right side and the back side of the apparatus. 5 is a flowchart for explaining control of a cooling fan in the image forming apparatus according to the first embodiment. 6 is a flowchart for explaining control of a cooling fan when the image forming apparatus according to the first embodiment is in a standby state. 5 is a flowchart for explaining control of a cooling fan after the image forming apparatus according to the first embodiment finishes execution of a job. 9 is a flowchart for explaining control of a cooling fan after the image forming apparatus according to the second embodiment finishes executing a job. It is a flowchart explaining the operation | movement of the controller cooling fan control at the time of HDD mirroring of 2nd Embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments do not limit the present invention according to the claims, and all combinations of features described in the embodiments are not necessarily essential to the solution means of the present invention. . In the following embodiments, an electronic apparatus according to the present invention will be described by taking an image forming apparatus such as a multifunction peripheral as an example. However, the present invention is not limited to this, and for example, a personal computer, a server computer, and various home appliances It can be applied to all electronic devices that control cooling fans.

[Embodiment 1]
1A is a view of the image forming apparatus 101 according to the first exemplary embodiment of the present invention as viewed from the right side, and FIG. 1B is a view of the image forming apparatus 101 as viewed from the back.

  A controller 104 that controls the image forming apparatus 100 is provided on the back surface of the image forming apparatus 101. An operation unit 108 that is a user interface (UI) for operating the image forming apparatus 101 and displaying the state of the apparatus is provided. , Provided on the front of the device. In addition, an intake port 110 that is an air intake port and exhaust ports 111 and 112 that discharge heat inside the device are arranged on the back of the device. The image forming apparatus 101 includes a scanner unit 102 that reads a document and a printer unit 103 that performs printing. A hard disk box 105 containing a hard disk drive (HDD) is installed in the vicinity of the CPU of the controller 104 in the vicinity thereof. In FIG. 1, the controller 104 and the hard disk box 105 are not visible from the outside, but are shown in a transparent state in order to show the positional relationship.

  FIG. 2 is a block diagram illustrating a hardware configuration of the image forming apparatus 101 according to the first embodiment of the present invention.

  The image forming apparatus 101 is large and includes a scanner unit 102 that is an image input device, a printer unit 103 that is an image output device, and a controller 104 that controls image processing and image forming operations. Since the scanner unit 102 and the printer unit 103 can have various configurations based on well-known techniques, description thereof is omitted here.

  The controller 104 includes a CPU 205 that controls the entire apparatus, a RAM 206 that is a main storage device such as a DRAM for operating the CPU 205, and a ROM 207 that stores a system boot program and the like. The controller 104 further operates an operation unit 108 for operating the image forming apparatus 101 and displaying the state of the apparatus, and an external interface for connecting to a computer terminal 210 which is an external device via a LAN, USB, or the like. 209. The image processing IC 211 is an ASIC that performs various image processes for converting image data input from the scanner unit 102 or the external interface 209 into image data to be output to the printer unit 103. The timer 219 measures the time according to the instruction from the CPU 205 and notifies the CPU 205 of the measured time. The DC power supply unit 212 generates DC power from commercial power and supplies DC power to each unit of the image forming apparatus 101.

  The controller 104 also includes a RAID controller 213 for performing mirroring control, and HDD-A 214 and HDD-B 215 as storage means. These HDD-A 214 and HDD-B 215 are accommodated in the hard disk box 105 and are arranged almost directly behind the board on which the CPU 205 is mounted. The mirroring control performed by the RAID controller 213 has a data restoration function that stores the same data in a plurality of disk drives and is called a rebuild function. With this rebuild function, the data stored in the failed HDD can be restored to another HDD. The HDD-A 214 and HDD-B 215 store various data such as device programs, image data, and operating systems in accordance with instructions from the CPU 205.

  The CPU 205 incorporates a temperature sensor 216 that is a thermistor, and measures the junction temperature inside the CPU 205. The power source / fan control IC 217 instructs the DC power supply unit 212 to control the power supply to each unit when the apparatus shifts to the power saving state, or when returning from the power saving state to shift to the standby state. . The shift to the power saving state is performed when the apparatus is not used for a predetermined time or is instructed by an operator. Further, the CPU 205 also controls the cooling fan 218 in accordance with the operating status of the apparatus and the temperature detected by the temperature sensor 216. The cooling fan 218 is a fan for cooling the controller 104, particularly the CPU 205, but the HDD accommodated in the hard disk box 105 can also be cooled by rotating the cooling fan 218.

  3A is a view of the substrate on which the controller 104 of the image forming apparatus 101 according to the first embodiment is mounted as viewed from the right side of the apparatus, and FIG. 3B is a view on the substrate on which the controller 104 is mounted. It is the figure seen from the back of an apparatus. Hereinafter, the cooling structure of the controller 104 will be described with reference to FIG. In FIG. 3, parts common to FIG. 2 are denoted by the same reference numerals.

  The board 300 is a printed wiring board, and a plurality of IC chips including the CPU 205 are mounted on the board 300. The substrate 300 is fastened with screws 303 at the positions of the sheet metal 301 and the screw holes 302. Further, the substrate 300 is covered with a sheet metal 301 together with the hard disk box 105. The substrate 300 is predetermined so that punch holes form a honeycomb structure in the lower portion of the sheet metal 301, and the intake port 110 and the exhaust port 111 (see FIG. 1). It is provided at intervals. Further, a heat sink 334 is installed in the CPU 205 that generates a large amount of heat, and the cooling efficiency of the CPU 205 is further increased.

  The cooling fan 218 is disposed in the vicinity of the air inlet 110, and can rotate the outside air into the apparatus by its rotation. When cold air from the outside is introduced by the cooling fan 218, most of the inflowed air is supplied to the CPU 205. And the fin provided in the heat sink 334 is cooled with the supplied air. As a result, the heat of the CPU 205 transmitted to the fins of the heat sink 334 is cooled by the air, and the CPU 205 can be efficiently cooled. In addition, a part of the air that has flowed in from the air intake port 110 also flows to the HDD-A 214 and HDD-B 215 side to a small extent and is used for cooling the HDD.

  Next, when the air that has passed through the CPU 205 reaches the lower part of the sheet metal 301 as it is, a part of the air flows into the lower part of the apparatus through a punch hole provided in the lower part, and an exhaust fan (not shown) provided in the exhaust port 112. It is discharged outside through the machine. On the other hand, the air bounced off by hitting the lower sheet metal 301 without passing through the punch holes and the air heated by the image processing IC 211 flow on the right side of the substrate 300 by natural convection and are discharged to the outside through the exhaust port 111. With the cooling structure described above, devices with a large amount of heat generation such as the CPU 205, HDD-A 214, HDD-B 215, and image processing IC 211 can be effectively and efficiently cooled by the single cooling fan 218.

  Next, cooling fan control after activation of the image forming apparatus 101 shown in FIG. 2 will be described with reference to the flowchart of FIG.

  FIG. 4 is a flowchart for explaining cooling fan control in the image forming apparatus 101 according to the first embodiment. Note that this processing is achieved by the CPU 205 executing a program expanded in the RAM 206 from the ROM 207, HDD-A 214, or HDD-B 215, for example.

  When the image forming apparatus 101 is activated and the initialization operation is completed, in step S401, the apparatus enters a standby state and enters a job reception waiting state. At this time, the CPU 205 controls the cooling fan 218 according to a temperature detected by a temperature sensor 216 described later. The process of S401 will be described later with reference to the flowchart of FIG. Next, proceeding to S402, the CPU 205 determines whether or not the state of the device has changed from the standby state to another state. If the state of the device remains unchanged without changing the state of the device, the process returns to S401. If changed, the control of the cooling fan is changed according to the state. Here, for example, when it is determined that the apparatus shifts to the sleep state because it has not been used for a predetermined time, the process proceeds to S403. In step S <b> 403, the CPU 205 controls the power supply / fan control IC 217 to stop power supply to most of the apparatus except for a part of the controller 104 such as the external interface 209. At this time, since the power supply to the CPU 205 and the cooling fan 218 is also lost, the cooling fan 218 stops. Thereafter, in S404, when a return instruction from the sleep state by the user or a return factor such as an original being placed on the scanner unit 102 occurs, the CPU 205 again switches to the standby state and controls the cooling fan by the CPU 205.

  On the other hand, if the CPU 205 determines in step S402 that the job such as a scan operation or a print operation has been executed, the process advances to step S405. In step S <b> 405, the CPU 205 controls the power supply / fan control IC 217 to rotate the cooling fan 218 regardless of the temperature detected by the temperature sensor 216. That is, while the job is being executed, the cooling fan 218 always rotates, so noise is generated. However, during the job execution, the motor rotation sound of the scanner unit 102 and the printer unit 103 is much louder, so the sound of the cooling fan 218 is drowned out by the sound, and the sound of the cooling fan 218 has almost no influence. . For this reason, during the execution of the job, the cooling fan 218 is always rotated for maximum cooling.

  As described above, when the rotation sound of the cooling fan 218 is greatly affected, such as in the sleep state or the standby state, the rotation of the cooling fan is suppressed unnecessarily. During the execution of the job, the inside of the apparatus can be cooled to the maximum by constantly rotating the cooling fan in a state where the influence of sound on the surroundings is small.

  Next, the cooling fan control according to the temperature detected by the temperature sensor 216 will be described with reference to the flowchart of FIG.

  FIG. 5 is a flowchart illustrating control of the cooling fan 218 when the image forming apparatus 101 according to the first embodiment is in a standby state. Note that this processing is achieved by the CPU 205 executing a program expanded in the RAM 206 from the ROM 207, HDD-A 214, or HDD-B 215, for example.

  In S501 and S502, the CPU 205 acquires the temperature detected by the temperature sensor 216 at a predetermined time interval of about 30 seconds, for example. In step S503, the CPU 205 determines the current state of the cooling fan 218. If it is determined that the state of the cooling fan 218 is stopped, the process advances to step S504, and the CPU 205 determines whether the temperature detected by the temperature sensor 216 acquired in step S502 is, for example, 82 ° C. or higher. If it determines with 82 degreeC or more, it will progress to S505, and CPU205 will control the power supply / fan control IC217, will rotate the cooling fan 218, and will progress to S508. On the other hand, when it determines with temperature being lower than 82 degreeC by S504, it progresses to S508.

  On the other hand, if the CPU 205 determines in step S503 that the state of the cooling fan 218 is rotating, the process advances to step S506, and the CPU 205 determines whether the temperature detected by the temperature sensor 216 is, for example, 72 ° C. or less. If it is determined that the temperature is 72 ° C. or lower, the process advances to step S507, and the CPU 205 controls the power supply / fan control IC 217 to stop the rotation of the cooling fan 218, and advances to step S508. On the other hand, when it determines with it being higher than 72 degreeC by S506, it progresses to S508. In step S508, the CPU 205 determines whether the state of the apparatus has changed as in step S402 in FIG. 4. If the state of the apparatus does not change, the process returns to step S501. If the state of the apparatus changes, the process ends.

  Next, referring to the flowchart of FIG. 6, the cooling fan control operation after the job execution by the image forming apparatus 101 according to the first embodiment is described.

  FIG. 6 is a flowchart illustrating control of the cooling fan after the image forming apparatus 101 according to the first embodiment finishes executing the job. Note that this processing is achieved by the CPU 205 executing a program expanded in the RAM 206 from the ROM 207, HDD-A 214, or HDD-B 215, for example.

  When a job such as scanning or printing by the image forming apparatus 101 is completed, the CPU 205 shifts to a standby state. At this time, the CPU 205 uses the timer 219 to count the time during which the job has been executed. The job execution time may be measured simply by measuring the time when the job was started by the timer 219 and the time when the job was completed, and obtaining the difference from the time. Alternatively, it may be obtained from the time when the job is started and the contents of the job (number of printed sheets or scanned sheets). Further, for example, this includes a case where a small amount of jobs are continuously executed a plurality of times, for example, for 60 minutes. In this case, the job is executed for 60 minutes.

  In step S <b> 602, the CPU 205 determines whether the job executed by the image forming apparatus 101 has been continuously executed for a predetermined time or longer (here, for example, 60 minutes or longer). Also, the term “continuous” as used herein refers to a situation in which, for example, the operating rate within a predetermined time exceeds a predetermined amount (for example, 90%). In the image forming apparatus 101 according to the first embodiment, when printing is performed continuously for 60 minutes, the temperature of the HDD rises by about 10 ° C. For this reason, if the temperature rises further, there is a possibility that the rated temperature of the HDD will be exceeded in the standby state, so the predetermined time is set to 60 minutes here. If it is determined in S602 that the job execution time is within 60 minutes, the process advances to S603, and the CPU 205 executes the process described with reference to the flowchart of FIG. finish.

  On the other hand, if the CPU 205 determines in step S602 that the job has been continuously executed for 60 minutes or more, the process advances to step S604, and the CPU 205 sets the cooling fan for a fixed time, here 30 minutes, regardless of the temperature detected by the temperature sensor 216. Continue to force 218 to rotate. That is, even if the apparatus shifts to the standby state, the cooling fan 218 continues to rotate for 30 minutes.

  In the image forming apparatus 101 according to the first embodiment, when the cooling fan 218 is rotated for 30 minutes, the temperature of the HDD decreases by about 5 ° C. or more in the standby state, so that the temperature becomes sufficiently safe.

  Thus, after the cooling fan 218 is rotated for 30 minutes, the process proceeds to S605, where the CPU 205 determines the current state of the apparatus. If the CPU 205 determines that it is in the standby state, the process advances to step S603, executes the cooling fan control in the normal standby state, and ends this process. If the sleep state is determined in S605, the process proceeds to S606, and the CPU 205 controls the power supply / fan control IC 217 to stop the rotation of the cooling fan 218, and ends this process. If the CPU 205 determines in step S605 that the job is being executed, the process advances to step S607 to continue the rotation of the cooling fan 218, and the process ends.

  As described above, according to the first embodiment, the temperature of the CPU or the HDD is excessively increased without adding a new temperature sensor even when the job execution state shifts to the standby state for a long time. Can be prevented. Specifically, for example, when a job such as printing is continuously executed for several hours, the temperature of the CPU 205 is suppressed because the fan is rotating during execution of the job, but the HDD is in a high temperature state. . In this state, when the standby state is entered, the cooling fan 218 stops and the temperature of the CPU 205 starts to rise, and there is a possibility that the temperature of the HDD further rises due to the heat generated by the HDD. However, by performing the control of the first embodiment, it is possible to prevent the temperature of the CPU and HDD from excessively increasing.

  In the first embodiment, power supply to the CPU 205 and the cooling fan 218 is stopped when the sleep state is entered, so that cooling by the cooling fan 218 is also stopped. However, in the case of being affected by heat from a fixing device other than the CPU, the cooling fan 218 is rotated while the power supply to the cooling fan 218 is maintained for a certain period of time after shifting to the sleep state. Also good. By doing so, the influence of tilt heat from the CPU 205 is reduced. In addition, it goes without saying that various configurations can be adopted according to the exhaust heat state of the apparatus, such as shortening the time for rotating the cooling fan 218 at this time.

[Embodiment 2]
Next, a second embodiment of the present invention will be described. In the first embodiment described above, the case where the heat generation condition in the casing changes due to addition of an HDD or an option board in the casing of the image forming apparatus 101 is not taken into consideration. For this reason, it is difficult to cope with a case where the heat source in the housing is greatly increased. Therefore, an example will be described in which the apparatus can be operated safely without newly adding a temperature sensor even when the configuration of the apparatus is changed and the number of heat sources in the housing is increased. Note that the hardware configuration and the like of the image forming apparatus 101 according to the second embodiment are the same as those of the first embodiment, and thus the description thereof is omitted.

  FIG. 7 is a flowchart illustrating control of the cooling fan after the image forming apparatus 101 according to the second embodiment finishes executing the job. Note that this processing is achieved by the CPU 205 executing a program expanded in the RAM 206 from the ROM 207, HDD-A 214, or HDD-B 215, for example.

  Since S702 to S704 and S707 to S709 in FIG. 7 are the same as S602 to S607 in FIG. 6 according to the first embodiment, the description thereof is omitted. In the second embodiment, HDD mirroring is shown as an example of a significant change in the device configuration. As shown in FIG. 8, in the mirroring of the HDD, it is necessary to provide two HDDs in the apparatus, so that the temperature of each HDD is significantly increased as compared with the case of only one HDD.

  FIG. 8 is an external view of the controller 104 of the image forming apparatus 101 according to the second embodiment when viewed from the right side of the apparatus. FIG. 8A shows a state in which only HDD-A 214 is mounted, and FIG. 8B shows the mirroring of HDD with HDD-A 214 and HDD-B 215 mounted, as in FIG. 3A. The state where it can be implemented is shown.

  In step S701, the CPU 205 determines whether HDD mirroring is set. If the HDD mirroring is not set, the CPU 205 advances to step S703 and executes the processing described above with reference to FIG. On the other hand, if it is determined that HDD mirroring is set, the process advances to step S705. In step S <b> 705, the CPU 205 determines whether the executed job has been continuously executed for a certain time (for example, 15 minutes or more). Here, when the HDD is single, it is determined whether the job has been executed for 60 minutes or more (S703), whereas in S705, it is determined whether the job is shorter than 15 minutes. This is because in the case of a single HDD, the temperature of the HDD rises by about 10 ° C. in 60 minutes, whereas when HDD mirroring is performed, the temperature rises by about 10 ° C. in just 15 minutes. If the CPU 205 determines in step S705 that the job has not been continuously executed for 15 minutes or more, the process proceeds to step S702. If the CPU 205 determines that the job has been continuously executed for 15 minutes or more, the process proceeds to step S706. In step S706, the CPU 205 controls the power source / fan control IC 217 to forcibly rotate the cooling fan 218 for about 60 minutes. In other words, in the HDD mirroring state, even when the execution time of continuously executed jobs is shorter, the temperature in the apparatus rises above a specified level, so the cooling fan is forcibly rotated and the rotation time is reduced. Lengthen. Thereby, even when the heat source in a housing | casing increases, the temperature rise in an apparatus can be suppressed to prescription | regulation.

  The control of the cooling fan of the image forming apparatus 101 has been described above. However, the present invention is not limited to these first and second embodiments. For example, an SSD (Solid State Drive) instead of an HDD or an option board on which a chip with a large amount of heat is mounted is added. Even if applicable.

(Other embodiments)
The present invention supplies a program that realizes one or more functions of the above-described embodiments to a system or apparatus via a network or a storage medium, and one or more processors in a computer of the system or apparatus read and execute the program This process can be realized. It can also be realized by a circuit (for example, ASIC) that realizes one or more functions.

  The present invention is not limited to the above-described embodiment, and various changes and modifications can be made without departing from the spirit and scope of the present invention. Therefore, in order to make the scope of the present invention public, the following claims are attached.

  DESCRIPTION OF SYMBOLS 101 ... Image forming apparatus, 102 ... Scanner part, 103 ... Printer part, 104 ... Controller part, 205 ... CPU, 216 ... Temperature sensor, 218 ... Cooling fan, 219 ... Timer

Claims (13)

An electronic device including a plurality of heating elements and a cooling fan,
A temperature sensor provided corresponding to a predetermined heating element;
A time measuring means for measuring the time when the job is executed;
When the execution of the job is finished and the state is shifted to the standby state, if the time counted by the time measuring means is a predetermined time or more, the cooling fan is set to the first time regardless of the temperature detected by the temperature sensor, Control means for controlling to rotate;
An electronic device comprising:   The electronic device according to claim 1, wherein the heating element is a heating element having an electronic circuit.   The electronic apparatus according to claim 1, wherein the control unit constantly rotates the cooling fan during execution of the job.   When the time measured by the time measuring means is less than the predetermined time, the control means rotates the cooling fan when the temperature detected by the temperature sensor in the standby state is higher than a first temperature, 2. The electronic device according to claim 1, wherein when the temperature detected by the temperature sensor is lower than a second temperature lower than the first temperature, the cooling fan is stopped.   The time when the job is executed is the time when the job is continuously executed, and the job is continuously included even when the job includes a plurality of jobs and the operation rate within a predetermined time by the plurality of jobs exceeds a predetermined amount. The electronic device according to claim 1, wherein the electronic device is regarded as an execution time.   6. The electronic apparatus according to claim 1, wherein the plurality of heating elements include a storage device and a CPU, and the predetermined heating element is the CPU.   The electronic apparatus according to claim 6, wherein the CPU and a heating element other than the predetermined heating element are provided to face each other with a substrate interposed therebetween.   When another heating element is added to the plurality of heating elements, the control unit detects the temperature detected by the temperature sensor even if the time counted by the timing unit is shorter than the predetermined time. 7. The electronic apparatus according to claim 6, wherein the electronic device is controlled so as to rotate regardless of the cooling fan for a second time.   When mirroring is performed by adding another storage device to the storage device, the control means detects the temperature detected by the temperature sensor even if the time measured by the time measuring means is shorter than the predetermined time. 7. The electronic apparatus according to claim 6, wherein the electronic device is controlled so as to rotate the cooling fan for a second time regardless of.   The electronic apparatus according to claim 8, wherein the second time is longer than the first time.   The electronic device according to claim 6, wherein the CPU and the storage device are arranged close to each other. A method of controlling a cooling fan in an electronic device including a plurality of heating elements and a cooling fan,
A timekeeping process that times the job execution time;
When the execution of the job ends and shifts to the standby state, if the time counted in the timing step is a predetermined time or more, regardless of the temperature detected by the temperature sensor provided corresponding to the predetermined heating element A control step for controlling the cooling fan to rotate for a first time;
A method for controlling a cooling fan, comprising:   A program for causing a computer to execute each step of the cooling fan control method according to claim 12.

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