JP2014102412A - Image forming apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image forming apparatus capable of determining a state of dew condensation inside an apparatus body.SOLUTION: An image forming apparatus comprises: an apparatus body; an internal temperature sensor 91; an external temperature sensor; and an external humidity sensor (temperature and humidity sensor 92), and further comprises a control unit 100 that has a dew condensation state determination unit 110 that determines a state of dew condensation inside the apparatus body on the basis of an internal temperature detected by the internal temperature sensor 91 and an external temperature and external humidity detected by the temperature and humidity sensor 92. The dew condensation state determination unit 110 compares a correction dew point temperature higher, by a predetermined correction temperature, than a dew point temperature calculated based on an external temperature and an external humidity at a first time, with an internal temperature at a second time prior to the first time by the first time, and determines the presence of the dew condensation state when the internal temperature is lower than the correction dew point temperature.

Description

  The present invention relates to an image forming apparatus capable of determining a dew condensation state in an apparatus main body.

  2. Description of the Related Art An electrophotographic image forming apparatus provided with an LED array in which LEDs are arranged in the paper width direction as an exposure apparatus is known.

JP 2010-52154 A

  By the way, when the image forming apparatus is suddenly moved from a cold room to a warm room, condensation may occur in the apparatus main body. If the device is operated in such a dewed state, the wiring in the semiconductor chip constituting the LED array may corrode and cause a malfunction. In addition, various problems may occur due to condensation even in portions other than the LED array.

  SUMMARY An advantage of some aspects of the invention is that it provides an image forming apparatus capable of determining a dew condensation state in an apparatus main body.

In order to achieve the above-described object, the present invention provides an apparatus main body having an image forming unit for forming an image on a recording sheet, an internal temperature sensor for detecting an internal temperature which is a temperature inside the apparatus main body, An external temperature sensor for detecting the external temperature that is the temperature of the device, an external humidity sensor for detecting the external humidity that is the humidity outside the device body, the internal temperature detected by the internal temperature sensor, and the external temperature sensor An image forming apparatus is provided that includes a control unit having a dew condensation state determination unit that determines a dew condensation state in the apparatus main body based on the external temperature and the external humidity detected by an external humidity sensor.
In this image forming apparatus, the dew state determination unit includes a corrected dew point temperature that is higher by a predetermined correction temperature than the dew point temperature calculated from the external temperature and the external humidity at the first time, and a first time before the first time. The internal temperature at the second time is compared, and when the internal temperature is lower than the corrected dew point temperature, it is determined to be in the dew condensation state.

  According to such a configuration, the dew condensation state determination unit sets the correction dew point temperature, which is a determination criterion for dew condensation, to a temperature that is a predetermined correction temperature higher than the dew point temperature calculated from the external temperature and the external humidity. It becomes easy to make a determination on the side where condensation is caused by the temperature, and when there is a possibility of condensation, it is possible to reliably determine that the condensation is present. Further, the actual dew condensation state can be correctly determined by comparing the corrected dew point temperature at the first time with the internal temperature at the second time that is a first time before the first time. That is, even if air enters from the outside, the devices inside the device main body are not immediately heated, and a slight delay occurs in the temperature rise compared to the internal temperature sensor. By comparing the dew point temperature with the internal temperature at the second time (time just before the first time), the dew condensation state can be correctly determined.

  In the image forming apparatus described above, the dew condensation state determination unit can change the correction temperature according to the operating state of the apparatus main body.

  According to such a configuration, an appropriate correction temperature can be set according to the operating state of the apparatus main body, and a more accurate determination of the dew condensation state can be performed.

  In the above-described image forming apparatus, it is preferable that the control unit includes a storage unit in which a result determined by the dew condensation state determination unit is written.

  By writing the result determined by the dew condensation state determination unit in the storage unit, when a failure occurs in the image forming apparatus, the failure analysis can be efficiently performed with reference to the record of the dew condensation state.

  In the image forming apparatus described above, it is desirable that the dew condensation state determination unit counts the number of times that the inside of the apparatus main body is determined to be in a dew condensation state, and records it in the storage unit.

  In this way, by counting and recording the number of times that the dew condensation state determination unit has determined that it is in the dew condensation state, the failure analysis can be performed by referring to the dew condensation state recording when a failure occurs in the image forming apparatus. Can be done efficiently.

  In the image forming apparatus described above, it is desirable that the dew condensation state determination unit changes the first time according to the operating state of the apparatus main body.

  According to such a configuration, it is possible to set an appropriate first time according to the operating state of the apparatus main body, and perform a more accurate determination of the dew condensation state.

  In the above-described image forming apparatus, the external temperature sensor and the external humidity sensor can be a temperature / humidity sensor configured integrally.

  In the above-described image forming apparatus, the external temperature sensor and the external humidity sensor can be provided in the apparatus main body so as to face the air inlet of the apparatus main body.

  According to such a configuration, it is possible to correctly detect the external temperature and the external humidity, and it is possible to prevent the external temperature sensor and the external humidity sensor from being damaged.

  In the image forming apparatus described above, the dew condensation state determination unit can determine the dew condensation state in the apparatus main body during a second time after the image forming apparatus is turned on.

  Normally, the internal temperature is lower than the external temperature only for a while after the power is turned on, and after a certain amount of time has passed since the power was turned on, the temperature inside the device rises and the possibility of condensation is low. Become. Therefore, the dew condensation state can be efficiently determined by determining the dew condensation state during the second time after the power is turned on.

  In the image forming apparatus described above, an LED unit for exposing the photosensitive member is provided in the apparatus main body, and the dew condensation state determination unit can determine whether or not the LED unit is in the dew condensation state.

  With such a configuration, it is possible to determine the dew condensation state of the LED unit that is important for image formation.

  According to the image forming apparatus of the present invention, it is easy to make a determination on the side where condensation has occurred by the correction temperature, and when there is a possibility of condensation, it can be reliably determined that there is condensation. Further, the dew point can be correctly determined by comparing the corrected dew point temperature at the first time with the internal temperature at the second time, which is a first time before the first time.

1 is a diagram illustrating a schematic configuration of a color printer as an example of an image forming apparatus according to an embodiment of the present invention. It is a figure explaining the flow of the air in a color printer. It is a block diagram which shows the structure of a control part. It is a table | surface which shows the example of a setting of correction | amendment temperature and 1st time. It is a flowchart which shows the determination process of a dew condensation state. It is a table | surface which shows the determination result of the change of each temperature after power-on, and a dew condensation state. It is a graph which shows the change of the correction | amendment dew point temperature after power-on, and internal temperature.

  Next, an embodiment of the present invention will be described in detail with reference to the drawings as appropriate. In the following description, the direction will be described with reference to the user who uses the color printer 1. That is, the left side in FIG. 1 is “front”, the right side is “rear”, the front side is “right”, and the back side is “left”. Also, the vertical direction in FIG.

<Schematic configuration of color printer>
As illustrated in FIG. 1, the color printer 1 includes a paper feeding unit 20 and an image forming unit 30 in a main body housing 10 as an example of an apparatus main body. An upper cover 12 is provided on the upper side of the main body housing 10 so as to be rotatable up and down (openable and closable) with the rear side as a fulcrum.

  The paper feed unit 20 is provided at a lower portion in the main body housing 10, and mainly includes a paper feed tray 21 that stores the paper S and a supply mechanism 22 that supplies the paper S from the paper feed tray 21 to the image forming unit 30. I have. The sheets S in the sheet feed tray 21 are separated one by one by the supply mechanism 22 and supplied to the image forming unit 30.

  The image forming unit 30 mainly includes four LED units 40, four process units 50, a transfer unit 70, and a fixing unit 80.

  The LED unit 40 is disposed to face an upper side of a photosensitive drum 51 as an example of a photosensitive member, and includes a plurality of LEDs (not shown) arranged in the left-right direction at the lower end thereof. The LED unit 40 exposes the surface of the photosensitive drum 51 by blinking the light emitting unit based on the image data. The LED unit 40 is held by the upper cover 12 via the holding portion 14 and is configured to be separated from the photosensitive drum 51 by opening the upper cover 12.

  The process unit 50 is arranged side by side in the front-rear direction between the upper cover 12 and the paper feed tray 21, and is configured to be detachably attached to the main body housing 10 in a state where the upper cover 12 is opened. It has become. Each process unit 50 includes a photosensitive drum 51, a charger 52, a developing roller 53, a supply roller 54, a layer thickness regulating blade 55, and a toner container 56 that stores positively charged toner (developer). And a cleaning roller 57 are mainly provided.

  The transfer unit 70 is provided between the paper feeding unit 20 and the process unit 50, and includes a driving roller 71, a driven roller 72, a conveyance belt 73 as an example of an endless belt, and four transfer rollers 74. Mainly prepared. The conveyor belt 73 is stretched between the driving roller 71 and the driven roller 72, and the outer surface is disposed to face the respective photosensitive drums 51, and the respective transfer rollers 74 are disposed on the inner side thereof. Is disposed so as to sandwich the conveyor belt 73 therebetween.

  The fixing unit 80 is provided behind the process unit 50 and the transfer unit 70, and mainly includes a heating roller 81 and a pressure roller 82 that is disposed to face the heating roller 81 and presses the heating roller 81.

  In the image forming unit 30 configured as described above, first, the surface of each photosensitive drum 51 is uniformly charged by the charger 52 and then exposed to the LED light emitted from each LED unit 40. As a result, the potential of the exposed portion is lowered, and an electrostatic latent image based on the image data is formed on each photosensitive drum 51.

  Further, the toner in the toner container 56 is supplied to the developing roller 53 by the rotation of the supply roller 54, and enters between the developing roller 53 and the layer thickness regulating blade 55 by the rotation of the developing roller 53 and has a constant thickness. It is carried on the developing roller 53 as a thin layer.

  The toner carried on the developing roller 53 is supplied to the electrostatic latent image formed on the photosensitive drum 51 when the developing roller 53 comes into contact with the photosensitive drum 51. As a result, the toner is selectively carried on the photosensitive drum 51 to visualize the electrostatic latent image, and a toner image is formed by reversal development.

Next, the sheet S supplied on the conveyor belt 73 passes between each photosensitive drum 51 and each transfer roller 74, so that the toner image formed on each photosensitive drum 51 is placed on the sheet S. Transcribed.
Then, as the sheet S passes between the heating roller 81 and the pressure roller 82, the toner image transferred onto the sheet S is thermally fixed.

  A conveyance roller 15 is provided behind the fixing unit 80, and a discharge roller 16 is provided above the fixing unit 80. The paper S discharged from the fixing unit 80 is discharged to the outside of the main body housing 10 by the transport roller 15 and the discharge roller 16 and accumulated in the paper discharge tray 13.

  As shown in FIGS. 1 and 2, the left side wall 10 </ b> A of the left and right side walls of the main body housing 10 is indirectly detected on the left side wall 10 </ b> A. An internal temperature sensor 91 for detecting an internal temperature Tin that is a temperature inside the main body housing 10 is provided at a position corresponding to the unit 40, that is, in the vicinity of one LED unit 40. An air inlet 18 is provided at the front end of the upper portion of the left side wall 10A. The air inlet 18 is opposed to the air inlet 18 to detect an external temperature Tout, which is a temperature outside the main body housing 10, and outside the apparatus main body. A temperature / humidity sensor 92 for detecting the external humidity H, which is humidity, is provided. Of the left and right side walls of the main body housing 10, the right side wall 10 </ b> B is provided with an exhaust port 19 at the rear end portion of the lower portion, and an exhaust fan 95 is provided facing the exhaust port 19.

  With these configurations, when the exhaust fan 95 is driven, as shown in FIG. 2, the air outside the main body housing 10 is sucked from the air inlet 18 and hits the temperature / humidity sensor 92, and then along the left side wall 10A. Then, it flows from the front to the back in the main body housing 10. Then, the air flows between the process units 50 from the left side wall 10A toward the right side wall 10B, and further flows along the right side wall 10B from the front to the rear inside the main body housing 10. It is discharged out of the main body housing 10 through the exhaust port 19.

<Configuration for determination of condensation state>
As shown in FIG. 1, the color printer 1 performs printing control by the image forming unit 30 and control of the conveyance of the paper S at an appropriate position of the main body housing 10, and the dew condensation state in the main body housing 10. It has the control part 100 to determine.
As shown in FIG. 3, the control unit 100 includes a dew condensation state determination unit 110 and a storage unit 120 as a configuration related to the determination and recording of the dew condensation state.

  The dew condensation state determination unit 110 is means for determining the dew condensation state in the apparatus main body based on the external temperature Tout and the external humidity H detected by the temperature / humidity sensor 92. Therefore, the dew condensation state determination unit 110 includes a dew point temperature calculation unit 111, a correction temperature setting unit 112, a correction dew point temperature calculation unit 113, a first time setting unit 114, and a comparison determination unit 115.

The dew point temperature calculation unit 111 is means for calculating the dew point temperature Td by a known calculation formula based on the external temperature Tout and the external humidity H. Specifically, the dew point temperature calculation unit 111 calculates the saturated water vapor pressure ew from the SON-NTAG equation, and sets the water vapor pressure e at the external temperature Tout to e = H / 100 × ew.
Ask for. And dew point temperature Td is set to y = ln (e / 611.213)
If y ≧ 0,
Td = 13.715y + 8.4262 × 10 ^-1 y ² + 1.9048 × 10 ^-2 y ³ + 7.8158 × 10 ^-3 y ⁴
If y <0,
Td = 13.7204y + 7.36631 × 10 ^-1 y ² + 3.32136 × 10 ^-2 y ³ + 7.78591 × 10 ^-4 y ⁴
Calculated by

  The correction temperature setting unit 112 is means for determining a correction temperature M to be added to the dew point temperature Td according to the operating state of the apparatus main body.

The corrected dew point temperature calculation unit 113 is a unit that calculates the corrected dew point temperature Td _M by adding the correction temperature M to the dew point temperature Td.

The first time setting unit 114 includes a first time that is a time at which a corrected dew point temperature Td _M that is a determination criterion for condensation is calculated, and a second time that is a time at which the internal temperature Tin is compared with the corrected dew point temperature Td _M. It is a means for setting the difference. That is, even if air enters the main body casing 10 from the outside, the devices inside the main body casing 10 are not immediately heated, and a slight delay occurs in the temperature rise compared to the internal temperature sensor 91. A first time D is set according to the operating state of the apparatus main body as a time for correcting this delay.

Here, how to set the correction temperature M by the correction temperature setting unit 112 and how to set the first time D by the first time setting unit 114 will be described.
The correction temperature M and the first time D are set according to, for example, how close the component to be determined for the dew condensation state is to the air flow path in the main body housing 10 (how much is affected by the air flow). be able to. Since components near the air flow path are likely to condense, it is preferable to increase the correction temperature M and the first time D so that the tendency to determine the dew condensation state is strong. On the contrary, when it is going to determine the dew condensation state of components far from the airflow path, it is preferable to reduce the correction temperature M and the first time D.

  Also, when trying to determine the dew condensation state of parts near the cover such as the top cover, it is very easy to condense when the cover is opened because it is strongly affected by the outside air. When the cover is open, the correction temperature M and the first time D may be increased.

  Further, when it is desired to determine the dew condensation state of the parts close to the fixing unit 80, since the dew condensation is difficult due to the heating by the fixing unit 80, the correction temperature M and the first time D are small, and the parts far from the fixing unit 80 are used. When the dew condensation state is to be determined, the correction temperature M and the first time D may be increased. If more detailed settings are to be made, the correction temperature M and the first time D may be reduced only when the fixing unit 80 is ON.

  Further, during the conveyance of the paper (that is, during printing), the air flow becomes strong and easily affected by the air flow. Therefore, the correction temperature M and the first time D may be increased.

  From these, for example, an example in which the correction temperature M and the first time D are set for the part A near the airflow path, the fixing unit and the top cover and the part B far from the airflow path, the fixing unit and the top cover is shown in FIG. Will be described with reference to FIG.

Since the part A is closer to the airflow path, the fixing unit, and the top cover than the part B, the correction temperature M and the first time D are set higher than the part B in any mode.
In addition, during printing, since the influence of airflow is larger than in the ready state (the printing unit is in a standby state after the fixing unit 80 has been warmed up), the correction temperature M and the first time for the part A are higher than in the ready state. D is set large.
Further, in the sleep state (the fixing unit 80 is OFF), the component A is not warmed by the fixing unit 80, and therefore the correction temperature M and the first time D are set larger for the component A than in the ready state. .
Further, when the top cover is in the open state, the component A is strongly influenced by the outside air, so that the correction temperature M and the first time D are set higher for the component A than in the sleep state.

The comparison determination unit 115 compares the corrected dew point temperature Td _M at the first time with the internal temperature Tin that is the first time D before the first time, and in the dew condensation state when the internal temperature Tin is lower. It is means to determine that there is. It is recorded in the memory | storage part 120 that it determined with it being a dew condensation state.

  The storage unit 120 is an area in which the result determined by the dew condensation state determination unit 110 is recorded. Specifically, the time of the dew condensation state, the external temperature Tout, the external humidity H, and the internal temperature Tin are written in the storage unit 120. In addition, the dew condensation state determination unit 110 counts up the number of times that the dew condensation state is determined, and writes the information in the storage unit 120. In addition to this information, information on the external temperature Tout, external humidity H, internal temperature Tin for a predetermined time until the dew condensation state is reached, and the operation mode, the conveyance state of the paper S, etc. Other information that may be useful may be recorded in the storage unit 120.

  The control unit 100 performs the determination of the dew condensation state with the above configuration at a predetermined interval (for example, at an interval of 30 seconds) during a predetermined time (second time) after the color printer 1 is turned on. In addition, when it is determined that the dew condensation state is present, the control unit 100 stops energizing the LED unit 40 for a certain period of time, or energizes the LED unit 40 after a certain period of time to elevate the temperature to evaporate moisture. Or display an error message in the message panel.

<Dew condensation state determination process>
Next, an example of the dew state determination process will be described with reference to FIG. FIG. 5 shows only the process related to the determination of the dew condensation state.
When the power of the color printer 1 is turned on (S1), the control unit 100 starts a timer to measure the time since the power is turned on (S2). Then, the control unit 100 acquires the external temperature Tout and the external humidity H from the temperature / humidity sensor 92, and acquires Tin from the internal temperature sensor 91 (S3).

Then, the dew point temperature calculation unit 111 calculates the dew point temperature Td from the external temperature Tout and the external humidity H (S4). Next, the correction temperature setting unit 112 sets the correction temperature M according to the operating state of the color printer 1 (S5). Further, the correction dew point temperature calculating section 113 calculates a correction dew point temperature Td _M by adding the correction temperature M to the dew point temperature Td (S6). Further, the first time setting unit 114 sets the first time D according to the operating state of the color printer 1 (S7).

The comparison determination unit 115 compares the internal temperature Tin (at the second time) just before the first time D with the current corrected (first time) corrected dew point temperature Td _M, and the internal temperature Tin is corrected to the corrected dew point temperature Td. If not lower than _M (S8, No), the process proceeds to step S20. On the other hand, if the internal temperature Tin is lower than the correction dew point temperature Td _M (S8, Yes), it determines that the dew condensation state, writes that effect into the storage unit 120. Then, the dew condensation state determination unit 110 records the dew condensation state (time, temperature, etc.) in the storage unit 120 (S10), and counts up and writes the number of dew condensations (S11).

  Thereafter, in step S20, the control unit 100 determines whether or not the timer has passed the second time. If not (S20, No), the control unit 100 returns to step S3 and repeats the determination of the dew state. If it does (S20, Yes), the determination process of a dew condensation state will be complete | finished.

An example of the result of determining the dew condensation state as described above will be described with reference to FIGS. 6 and 7 show the determination of the dew condensation state for 15 minutes after the power is turned on. The correction temperature M is 3 degrees and the first time D is 4 minutes.
As shown in FIG. 6, when the external temperature Tout and the external humidity H are acquired at each time, the dew point temperature Td and the corrected dew point temperature Td _M are calculated according to these temperatures, and the correction is performed as indicated by the arrows. and dew point temperature Td _M and 4 minutes before the internal temperature Tin are compared. The result of this comparison, the internal temperature Tin is lower than the correction dew point temperature Td _M, if it is determined that the dew condensation state, if the determination result of the condensation conditions, 1 is indicated, is determined not to be a condensation state Indicates 0. As shown in FIG. 7, the internal temperature Tin tends to gradually increase after the power is turned on. If the internal temperature Tin is sufficiently increased (for example, higher than the external temperature Tout), the possibility of condensation is eliminated. By performing the determination of the dew condensation state for a while later, it is possible to efficiently determine the dew condensation state.

As described above, according to the color printer 1 of the present embodiment, it is possible to determine the dew condensation state of the device in the main body housing 10, particularly the LED unit 40. In this determination, the correction dew point temperature Td _M , which is a criterion for dew condensation, is set to a temperature that is higher than the dew point temperature Td calculated from the external temperature Tout and the external humidity H by a predetermined correction temperature M. It becomes easy to make a determination on the side where condensation occurs by the correction temperature M, and when there is a possibility of condensation, it can be reliably determined that the condensation state is present.

Further, the actual dew condensation state can be correctly determined by comparing the corrected dew point temperature Td _M at the first time with the internal temperature Tin at the second time that is a first time D before the first time.

  Furthermore, since the color printer 1 sets the appropriate correction temperature M and the first time D according to the operating state of the apparatus main body, it is possible to accurately determine the dew condensation state.

  In addition, the dew condensation state determination unit 110 writes the determination result in the storage unit 120 and records the number of times determined to be in the dew condensation state in the storage unit 120. Therefore, when the color printer 1 malfunctions, the dew condensation state is determined. Failure analysis can be efficiently performed with reference to the state record.

  Further, since the temperature / humidity sensor 92 is provided in the main body casing 10 so as to face the intake port 18, the external temperature Tout and the external humidity H can be correctly detected, and the temperature / humidity sensor 92 is in contact with an external object. Damage can be suppressed.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment. About a concrete structure, it can change suitably in the range which does not deviate from the meaning of this invention.

  In the embodiment, the sensor for detecting the external temperature and the external humidity outside the apparatus main body is an integrated temperature / humidity sensor. However, the external temperature sensor and the external humidity sensor may be provided separately.

  In the embodiment, the correction temperature and the first time are changed according to the operation state of the apparatus main body. However, the correction temperature and the first time may be constant values.

  In the embodiment, the external temperature sensor and the external humidity sensor (temperature / humidity sensor) are provided in the apparatus main body, but may be provided outside the apparatus main body. For example, information on the external temperature and external humidity may be received and acquired by wireless communication from an indoor temperature sensor and humidity sensor.

  In the embodiment, the color printer 1 capable of color printing is exemplified as the image forming apparatus, but the present invention is not limited to this. For example, the image forming apparatus may be a printer capable of only monochrome printing. The image forming apparatus is not limited to a printer, and may be, for example, a copier or a multi-function machine including a document reading apparatus such as a flat bed scanner.

DESCRIPTION OF SYMBOLS 1 Color printer 10 Main body case 18 Intake port 19 Exhaust port 20 Paper feed part 30 Image formation part 40 LED unit 50 Process unit 70 Transfer unit 80 Fixing unit 91 Internal temperature sensor 92 Temperature / humidity sensor 95 Exhaust fan 100 Control part 110 Condensing state Determination unit 111 Dew point temperature calculation unit 112 Correction temperature setting unit 113 Correction dew point temperature calculation unit 114 First time setting unit 115 Comparison determination unit 120 Storage unit

Claims (9)

An apparatus main body having an image forming unit for forming an image on a recording sheet;
An internal temperature sensor for detecting an internal temperature which is a temperature inside the apparatus body;
An external temperature sensor for detecting an external temperature which is a temperature outside the apparatus body;
An external humidity sensor for detecting an external humidity which is a humidity outside the apparatus body;
A dew state determination unit that determines a dew state in the apparatus main body based on the internal temperature detected by the internal temperature sensor, the external temperature detected by the external temperature sensor, and the external humidity detected by the external humidity sensor A control unit having
The dew condensation state determination unit includes a corrected dew point temperature that is higher by a predetermined correction temperature than a dew point temperature calculated from the external temperature and the external humidity at a first time, and a first time that is a first time before the first time. 2. An image forming apparatus comprising: comparing an internal temperature at two times and determining that a dew condensation state exists when the internal temperature is lower than the corrected dew point temperature.   The image forming apparatus according to claim 1, wherein the dew condensation state determination unit changes the correction temperature according to an operation state of the apparatus main body.   The image forming apparatus according to claim 1, wherein the control unit includes a storage unit in which a result determined by the dew condensation state determination unit is written.   The image forming apparatus according to claim 3, wherein the dew condensation state determination unit counts the number of times that the inside of the apparatus main body is determined to be in a dew condensation state and records the counted number in the storage unit.   The image forming apparatus according to claim 1, wherein the dew condensation state determination unit changes the first time according to an operation state of the apparatus main body.   The image forming apparatus according to claim 1, wherein the external temperature sensor and the external humidity sensor are temperature and humidity sensors configured integrally.   The image according to any one of claims 1 to 6, wherein the external temperature sensor and the external humidity sensor are provided in the apparatus main body so as to be opposed to an intake port of the apparatus main body. Forming equipment.   8. The dew condensation state determination unit executes determination of a dew condensation state in the apparatus body during a second time after the image forming apparatus is turned on. The image forming apparatus according to claim 1.   An LED unit for exposing a photosensitive member is provided in the apparatus main body, and the dew condensation state determination unit determines whether or not the LED unit is in a dew condensation state. The image forming apparatus according to claim 8.

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