JP2018182680A - Image reading device and image forming apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image reading device in which, when one reading part cannot read an image, the image can be read by the other reading part, thereby improving convenience for a user.SOLUTION: An image reading device 10 comprises: a document conveying part 10b that conveys a document R; a document reading part 10a that reads an image from the document R; and a control part 9 that controls the document conveying part 10b and document reading part 10a. The document reading part 10a includes a first reading part 12 that reads an image formed on the front side of the document R, and a second reading part 19 that reads an image formed on the back side of the document R. The control part 9 determines whether the first reading part 12 and second reading part 19 can read the images. When determining that one of the first reading part 12 and second reading part 19 cannot read the image, the control part 9 controls the document reading part 10a such that the other of the image reading parts reads the image.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an image reading apparatus and an image forming apparatus.

  The image forming apparatus described in Patent Document 1 includes a document feeding unit and an image reading unit. The document feeding unit conveys a document from the document placement tray to the document discharge tray via the document reading position. The image reading unit moves between the first reading position and the second reading position. The image reading unit reads an image from the surface of the document passing the document reading position at the first reading position. The image reading unit reads an image from a document on the contact glass while moving from the first reading position to the second reading position. The image reading unit has a light source unit and a light receiving unit. The light source unit emits light toward the document. The light receiving unit receives the reflected light reflected by the document, and generates image data indicating an image formed on the document. In the image forming apparatus described in Patent Document 1, light is emitted from the light source in the sleep mode to suppress a temperature decrease in the image forming apparatus. As a result, the occurrence of dew condensation on the image reading unit is suppressed.

JP, 2013-197742, A

  However, the image reading apparatus (image reading unit) described in Patent Document 1 does not have a second reading unit that reads an image from the back surface of the document conveyed by the document conveyance unit (original document feeding unit). There is room for improvement in the case where one of the reading units (image reading unit) and the second reading unit can not read an image. The reading unit can not read an image, for example, when dew condensation occurs.

  The present invention has been made in view of the above problems, and an object thereof is to improve the convenience of the user by reading an image by the other reading unit when the reading unit can not read the image. An image reading apparatus and an image forming apparatus are provided.

  An image reading apparatus according to the present invention includes a document conveyance unit, a document reading unit, and a control unit. The document transport unit transports a document along a transport path. The document reading unit reads an image from the document conveyed by the document conveyance unit. The control unit controls the document conveyance unit and the document reading unit. The document reading unit has a first reading unit and a second reading unit. The first reading unit reads an image formed on the surface of the document. The second reading unit reads an image formed on the back surface of the document. The control unit determines whether the first reading unit and the second reading unit can read the image. When the control unit determines that one of the first and second reading units can not read the image, the other reading unit reads the image. Control the document reader.

  An image forming apparatus according to the present invention includes the above-described image reading apparatus, and an image forming unit that forms the image on a recording medium.

  According to the image reading apparatus and the image forming apparatus of the present invention, when one reading unit can not read an image, the other reading unit can read the image, and the convenience of the user can be improved.

FIG. 1 is a diagram showing a configuration of an image forming apparatus according to an embodiment of the present invention. It is a figure showing composition of an image reading device concerning an embodiment of the present invention. FIG. 1 is a block diagram showing an image forming apparatus according to an embodiment of the present invention. It is a flowchart which shows control of the operating panel and the image reading apparatus by the control part which concerns on embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to the following embodiments. In the drawings, the same or corresponding portions are denoted by the same reference characters and description thereof will not be repeated.

  An image forming apparatus 1 according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a view showing the configuration of an image forming apparatus 1 according to an embodiment of the present invention. As shown in FIG. 1, the image forming apparatus 1 of the present embodiment is a multifunction peripheral. The multifunction peripheral has at least two functions of, for example, a copy function, a printer function, and a facsimile function. The image forming apparatus 1 may be a copying machine or a facsimile machine.

  The image forming apparatus 1 forms an image on a sheet S. The sheet S is an example of the recording medium of the present invention. The paper S is, for example, plain paper, copy paper, recycled paper, thin paper, thick paper, glossy paper, or OHP (Overhead Projector) paper.

  The image forming apparatus 1 includes a housing 2, a sheet feeding unit 3, an image forming unit 4, a fixing unit 5, a discharge tray 6, an operation panel 8, a control unit 9, and an image reading apparatus 10. .

  The housing 2 is formed in a box shape. The housing 2 accommodates therein the sheet feeding unit 3, the image forming unit 4, the fixing unit 5, and the control unit 9.

  The image reading device 10 is disposed above the housing 2. The image reading apparatus 10 includes a document reading unit 10 a, a document conveyance unit 10 b, and a document placement tray 16. A document bundle including at least one document can be placed on the document placement tray 16. The document conveyance unit 10 b sequentially conveys the uppermost document of the document bundle placed on the document placement tray 16 toward the document reading unit 10 a.

  The document reading unit 10a reads an image from the surface of a document conveyed by the document conveyance unit 10b to generate image data. Further, the document reading unit 10a reads an image of a document placed on a placement table to generate image data. The mounting table is disposed on the upper surface portion of the document reading unit 10a. The document reading unit 10 a outputs the image data to the control unit 9.

  Operation panel 8 is disposed on the front surface of document reading unit 10a. The operation panel 8 includes, for example, a display. The display displays various screens. The operation panel 8 also has a touch panel function. The operation panel 8 outputs an operation signal corresponding to the operation of the user to the control unit 9. The operation of the user includes, for example, an operation of performing various settings of the image forming apparatus 1.

  The sheet feeding unit 3 has a plurality of sheet feeding cassettes 31. The paper feed cassette 31 is disposed in the lower part of the housing 2. Each paper feed cassette 31 is removable from the housing 2. In addition, the sheet feeding cassette 31 can accommodate a plurality of sheets S. The sheet feeding unit 3 supplies the sheet S to the image forming unit 4 through the conveyance path of the sheet S.

  The image forming unit 4 is disposed downstream of the sheet feeding unit 3 in the transport path of the sheet S. The image forming unit 4 forms an image on the sheet S. In the present embodiment, the image forming unit 4 forms a toner image on the sheet S. The image forming unit 4 includes an image carrier 41, a charging unit 42, an exposure unit 43, a developing unit 44, and a transfer unit 45.

  The charging unit 42 charges the image carrier 41 to a predetermined potential. The exposure unit 43 irradiates the outer peripheral surface of the charged image carrier 41 with a laser to form an electrostatic latent image. The developing unit 44 supplies toner to develop the electrostatic latent image as a toner image. The transfer unit 45 forms a nip with the image carrier 41. A toner image is transferred from the image carrier 41 to the sheet S passing through the nip portion.

  The fixing unit 5 is disposed downstream of the image forming unit 4 in the transport path of the sheet S. The fixing unit 5 includes a heating member 51 and a pressure member 52. The heating member 51 heats the sheet S on which the toner image has been transferred. The pressing member 52 presses the sheet S on which the toner image has been transferred together with the heating member 51. Specifically, the pressure member 52 forms a fixing nip portion together with the heating member 51. When the sheet S passes through the fixing nip portion, the toner image is fixed to the sheet S. The sheet S on which the toner image is fixed is stacked on the discharge tray 6.

  The control unit 9 has, for example, a processor and a storage unit. The processor is, for example, a CPU (Central Processing Unit). The storage unit includes, for example, a semiconductor memory and an HDD (Hard Disk Drive). The processor controls the sheet feeding unit 3, the image forming unit 4, the fixing unit 5, the operation panel 8, and the image reading device 10 based on the computer program stored in the storage unit.

  Next, the configuration of the image reading device 10 will be further described with reference to FIG. FIG. 2 is a diagram showing the configuration of the image reading device 10. As shown in FIG. As shown in FIG. 2, the image reading apparatus 10 includes a second reading unit 19, a first detection unit 7a, a second detection unit 7b, and a third reading unit in addition to the document reading unit 10a and the document conveyance unit 10b. And a detection unit 7c.

  The document reading unit 10 a has a mounting table 11 and a first reading unit 12. The mounting table 11 has a first sub-contact glass 11 a, a main contact glass 11 b, and a partition plate 11 c.

  The first sub-contact glass 11 a and the main contact glass 11 b are formed of transparent plate-like glass. The partition plate 11c is disposed between the first sub-contact glass 11a and the main contact glass 11b. The first sub-contact glass 11a and the main contact glass 11b may be integrally formed. In this case, one contact glass is divided into a first sub-contact glass 11a and a main contact glass 11b by the partition plate 11c.

  The first reading unit 12 is disposed below the mounting table 11. The first reading unit 12 reads an image formed on the surface of the document R via the first sub-contact glass 11 a to generate image data. In addition, the first reading unit 12 reads an image from the document R placed on the main contact glass 11 b to generate image data. The first reading unit 12 outputs the image data to the control unit 9 described with reference to FIG.

  The first reading unit 12 includes a scanning unit 12a and a guiding unit 12b. The scanning unit 12a has, for example, a CIS (Contact Image Sensor) unit and a carriage. The CIS unit includes an LED (Light Emitting Diode) 12 c, an imaging lens, and an image sensor. LED12c is an example of the 1st light source of this invention. The carriage supports the CIS unit. The guide portion 12 b extends in the sub scanning direction. The guide portion 12b supports the carriage so as to be movable in the sub scanning direction.

  The second reading unit 19 is disposed along the transport path. The transport path is a path through which the document is transported by the document transport unit 10b. The second reading unit 19 reads an image formed on the back surface of the document R to generate image data. The second reading unit 19 outputs the image data to the control unit 9.

  The second reading unit 19 has a second secondary contact glass 19a and a CIS unit 19b. The CIS unit 19 b includes an LED 19 c, an imaging lens, and an image sensor. The LED 19c is an example of the second light source of the present invention. The CIS unit 19 b reads the image formed on the back surface of the document R via the second sub-contact glass 19 a.

  The first detection unit 7 a measures the temperature outside the image reading device 10 and generates first temperature information indicating the temperature outside the image reading device 10. The first detection unit 7 a outputs the first temperature information to the control unit 9. The first detection unit 7a is, for example, a temperature sensor such as a thermistor whose resistance value changes in accordance with a change in temperature.

  The second detection unit 7 b measures the temperature in the vicinity of the first reading unit 12, and generates second temperature information indicating the temperature in the vicinity of the first reading unit 12. The second detection unit 7 b outputs the second temperature information to the control unit 9. The second detection unit 7 b is, for example, a temperature sensor, similarly to the first detection unit 7 a.

  The third detection unit 7 c measures the temperature in the vicinity of the second reading unit 19, and generates third temperature information indicating the temperature in the vicinity of the second reading unit 19. The third detection unit 7 c outputs the third temperature information to the control unit 9. Similar to the first detection unit 7, the third detection unit 7 c is, for example, a temperature sensor.

  In the present embodiment, the image reading device 10 further includes a humidity measuring unit 7 d. The humidity measuring unit 7 d measures the humidity outside the image reading device 10 and generates humidity information indicating the humidity outside the image reading device 10. The humidity measuring unit 7 d outputs humidity information to the control unit 9. The humidity measuring unit 7d is, for example, a humidity sensor using a polymer film whose resistance value changes in accordance with a change in humidity.

  In addition to the document placement tray 16, the document transport unit 10b further includes a pickup roller 17a, a white reference roller 17b, a document discharge tray 18, and a plurality of transport roller pairs.

  The document placement tray 16 has a tray main body portion 16 a and an elevating portion 16 b. A document bundle R1 including at least one sheet-like document R is placed on the tray main body 16a and the elevating unit 16b. The lifting unit 16b moves in the vertical direction. The lifting unit 16 b is lifted when the document bundle R <b> 1 is placed on the document placement tray 16. As a result, the end on the leading end side of the document bundle R1 ascends and abuts on the pickup roller 17a.

  The pickup roller 17 a is disposed above the document placement tray 16. In detail, it is arrange | positioned above the raising / lowering part 16b. The pickup roller 17a abuts on the top surface of the document bundle R1 and rotates to send the document R located on the top of the document bundle R1 toward the downstream side of the transport path. Specifically, the pickup roller 17a sends out one original R from the original bundle R1, and sends out the next original R from the original bundle R1 after a preset time has passed.

  The white reference roller 17 b faces the second reading unit 19 via the transport path of the document R. The white reference roller 17 b transports the document R along the transport path. The white reference roller 17 b is used to adjust the white reference of the second reading unit 19. The plurality of transport roller pairs of the document transport unit 10b transport the document R transported by the pickup roller 17a and the white reference roller 17b to the document discharge tray 18 via the first sub-contact glass 11a. Documents R transported along the transport path are sequentially stacked on the document discharge tray 18.

  Next, the control unit 9 will be further described with reference to FIGS. 1 to 3. FIG. 3 is a block diagram schematically showing the image forming apparatus 1.

  For example, when the image forming apparatus 1 transitions from the power off state to the power on state, the control unit 9 determines whether the first reading unit 12 can read an image. Specifically, the control unit 9 compares the first temperature with the second temperature. The first temperature is a temperature outside the image reading device 10 indicated by the first temperature information. The second temperature is a temperature near the first reading unit 12 indicated by the second temperature information. When the difference between the first temperature and the second temperature is equal to or larger than the threshold, the control unit 9 determines that the first reading unit 12 can not read an image because condensation occurs in the first reading unit 12.

  The threshold is, for example, 7 ° C. when the external temperature detected by the first detection unit 7 a is 10 ° C. and the dew point temperature is 3 ° C. The dew point temperature is calculated by the control unit 9 based on, for example, the first temperature and the humidity information.

  Further, for example, when the image forming apparatus 1 transitions from the power off state to the power on state, the control unit 9 determines whether the second reading unit 19 can read an image. Specifically, the control unit 9 compares the first temperature and the third temperature. The third temperature is a temperature near the second reading unit 19 indicated by the third temperature information. When the difference between the first temperature and the third temperature is equal to or greater than the threshold, the control unit 9 determines that the second reading unit 19 can not read an image because condensation occurs in the second reading unit 19.

  The control unit 9 controls the operation panel 8 to display the first screen when it is determined that the first reading unit 12 and the second reading unit 19 can not read the image. The first screen indicates, for example, that condensation has occurred in the first reading unit 12 and the second reading unit 19 and that an image can not be read from the document R using the image reading apparatus 10.

  Further, when it is determined that the first reading unit 12 and the second reading unit 19 can not read an image, the control unit 9 starts the condensation removing operation of the first reading unit 12 and the second reading unit 19. The control unit 9 controls the operation panel 8 so as to stop the display of the first screen when it is determined that the removal of the condensation of the first reading unit 12 and the second reading unit 19 is completed. In addition, when stopping the display of the first screen, the control unit 9 controls the operation panel 8 to notify the user that condensation has been eliminated.

  The control unit 9 controls the first reading unit 12 so that the LED 12 c emits light in the condensation removal operation of the first reading unit 12. As a result, the temperature in the vicinity of the first reading unit 12 is increased by the heat radiation when the LED 12 c emits light, and the dew condensation generated in the first reading unit 12 is removed.

  The control unit 9 controls the second reading unit 19 so that the LED 19 c emits light in the condensation removal operation of the second reading unit 19. As a result, the temperature in the vicinity of the second reading unit 19 is increased by heat dissipation when the LED 19 c emits light, and the condensation is removed from the second reading unit 19.

  The control unit 9 is configured to display the second screen when it is determined that only the first reading unit 12 of the first reading unit 12 and the second reading unit 19 can not read an image. Control. The second screen indicates, for example, that condensation has occurred in the first reading unit 12 and that although the image reading apparatus 10 can read an image from the back of the document R, it can not read an image from the front of the document R. In this case, when the document bundle R1 is placed on the document placement tray 16 and the operation signal for starting the reading of the document R is input, the control unit 9 causes the second reading unit 19 to read from the back surface of the document R The image reading device 10 is controlled to read an image.

  Further, the control unit 9 starts reading the image from both sides of the document R after determining that only the first reading unit 12 can not read the image among the first reading unit 12 and the second reading unit 19. When the operation signal is input, the image reading apparatus 10 is controlled so that the second reading unit 19 reads an image from the back surface of the document R. After reading the image from the back side of the document R, the control unit 9 controls the operation panel 8 to display an instruction screen. The instruction screen instructs the user to place the original R (original bundle R1) discharged onto the original discharge tray 18 on the original placement tray 16 as it is. The control unit 9 controls the image reading device 10 so that the second reading unit 19 reads an image from the surface of the document R after the document R is placed on the document placement tray 16. In this case, the control unit 9 edits the image of the front side of the read original R and the image of the rear side of the original R in the correct arrangement order to generate image data.

  The control unit 9 displays the third screen when it is determined that only the second reading unit 19 of the first reading unit 12 and the second reading unit 19 can not read an image. Control. The third screen indicates, for example, that condensation has occurred in the second reading unit 19 and that although the image reading apparatus 10 can read an image from the front surface of the document R, it can not read an image from the back surface of the document R. In this case, when the document bundle R1 is placed on the document placement tray 16 and the operation signal for starting the reading of the document R is input, the control unit 9 receives the operation signal to start reading the document R from the front surface of the document R The image reading device 10 is controlled to read an image.

  Further, the control unit 9 starts reading the image from both sides of the document R after determining that only the second reading unit 19 can not read the image among the first reading unit 12 and the second reading unit 19. When the operation signal is input, the image reader 10 is controlled to read an image from the surface of the document R by the first reader 12. After reading the image from the front side of the document R, the control unit 9 controls the operation panel 8 to display an instruction screen. The instruction screen instructs the user to place the original R (original bundle R1) discharged onto the original discharge tray 18 on the original placement tray 16 as it is. The control unit 9 controls the image reading device 10 so that the first reading unit 12 reads an image from the back surface of the document R after the document R is placed on the document placement tray 16. In this case, the control unit 9 edits the image of the front side of the read original R and the image of the rear side of the original R in the correct arrangement order to generate image data.

  In the image forming apparatus 1 of the present embodiment, when it is determined that one of the first reading unit 12 and the second reading unit 19 can not read the image, the other reading unit reads the image. Then, the image reading device 10 is controlled. As a result, even if one reading unit can not read the image, the user can cause the other reading unit to read the image. Therefore, in the image forming apparatus 1 of the present embodiment, the convenience of the user can be improved.

  When it is determined that only the first reading unit 12 of the first reading unit 12 and the second reading unit 19 can not read an image, the control unit 9 starts the condensation removal operation of the first reading unit 12. The control unit 9 controls the operation panel 8 to stop the display of the second screen when it is determined that the removal of the condensation of the first reading unit 12 is completed. In addition, when stopping the display of the second screen, the control unit 9 controls the operation panel 8 so as to notify the user that condensation has been eliminated.

  When it is determined that only the second reading unit 19 of the first reading unit 12 and the second reading unit 19 can not read an image, the control unit 9 starts the condensation removing operation of the second reading unit 19. The control unit 9 controls the operation panel 8 so as to stop the display of the third screen when it is determined that the removal of the condensation of the second reading unit 19 is completed. In addition, when stopping the display of the third screen, the control unit 9 controls the operation panel 8 to notify the user that condensation has been eliminated.

  In the image forming apparatus 1 of the present embodiment, when the removal of the condensation of the first reading unit 12 and / or the second reading unit 19 is completed, the user is notified that the condensation has been eliminated. As a result, when dew condensation is eliminated, the user can quickly start reading the document R, and the convenience of the user can be further improved.

  Next, control of the operation panel 8 and the image reading device 10 by the control unit 9 will be further described with reference to FIGS. 1 to 4. FIG. 4 is a flowchart showing control of the operation panel 8 and the image reading device 10 by the control unit 9. When the image forming apparatus 1 transitions from the power off state to the power on state, the control unit 9 starts control of the operation panel 8 and the image reading apparatus 10 shown in FIG. 4. Specifically, when the image forming apparatus 1 transitions from the power OFF state to the power ON state, the control unit 9 starts condensation occurrence determination processing.

  As shown in FIG. 4, in step S <b> 10, the control unit 9 determines whether the first reading unit 12 can read an image based on the first temperature information, the second temperature information, and the humidity information. If the control unit 9 determines that the first reading unit 12 can not read the image (No in step S10), in step S20, based on the first temperature information, the third temperature information, and the humidity information, It is determined whether the reading unit 19 can read an image.

  When it is determined that the second reading unit 19 can not read the image (No in step S20), the control unit 9 controls the operation panel 8 to display the first screen in step S30. After displaying the first screen, the control unit 9 controls the image reading device 10 to start the condensation removing operation of the first reading unit 12 and the second reading unit 19 in step S40. The control unit 9 returns the condensation occurrence determination processing to step S10.

  When it is determined that the second reading unit 19 can read the image (Yes in step S20), the control unit 9 controls the operation panel 8 to display the second screen in step S50. After displaying the second screen, the control unit 9 controls the image reading device 10 to start the condensation removal operation of the first reading unit 12 in step S60. The control unit 9 returns the condensation occurrence determination processing to step S10.

  If the control unit 9 determines that the first reading unit 12 can read the image (Yes in step S10), in step S70, the second reading is performed based on the first temperature information, the third temperature information, and the humidity information. It is determined whether the unit 19 can read an image. When it is determined that the second reading unit 19 can not read the image (No in step S70), the control unit 9 controls the operation panel 8 to display the third screen in step S80. After displaying the third screen, the control unit 9 controls the image reading device 10 to start the condensation removal operation of the second reading unit 19 in step S90. The control unit 9 returns the condensation occurrence determination processing to step S10.

  When it is determined that the second reading unit 19 can read the image (Yes in step S70), the control unit 9 ends the condensation occurrence determination process illustrated in FIG. 4. When the control unit 9 determines that the second reading unit 19 can read an image (Yes in step S70), and the screens are displayed on the operation panel 8, the display of the screens is stopped. Control the operation panel 8. In addition, the control unit 9 controls the operation panel 8 to notify that the condensation of the first reading unit 12 and the second reading unit 19 has been eliminated after stopping the display of each screen.

  The image forming apparatus 1 and the image reading apparatus 10 according to the embodiment of the present invention have been described above with reference to FIGS. 1 to 4. However, the present invention is not limited to the above embodiment, and can be implemented in various modes without departing from the scope of the invention.

  For example, in the embodiment of the present invention, the present invention is applied to the image forming apparatus 1, but the present invention is not limited to this. The present invention can also be applied to an image reading apparatus including an operation panel and a control unit.

  Further, in the embodiment of the present invention, the condensation of the first reading unit 12 is eliminated by the light emission of the LED 12c, and the condensation of the second reading unit 19 is resolved by the light emission of the LED 19c. The invention is not limited to this. The image reading device 10 may have a configuration for eliminating condensation of the first reading unit 12 and the second reading unit 19. For example, the image reading apparatus 10 may further include a heater capable of supplying warm air to the first reading unit 12 and the second reading unit 19. The heater supplies warm air to the first reading unit 12 and the second reading unit 19 to eliminate condensation on the first reading unit 12 and the second reading unit 19.

  In the embodiment of the present invention, when it is determined that the first reading unit 12 and the second reading unit 19 can read an image, the condensation occurrence determination processing is ended, but the present invention is not limited to this. The control unit 9 refers to the fact that condensation does not occur in the first reading unit 12, and for example, when it is determined that the light reception amount of the first reading unit 12 is less than the threshold value, the control unit 9 has a defect in the first reading unit 12. The operation panel 8 may be controlled so as to notify that a problem has occurred. The light reception amount of the first reading unit 12 is detected, for example, when adjusting the white reference of the first reading unit 12. As in the first reading unit 12, the control unit 9 refers to the fact that condensation does not occur in the second reading unit 19, and determines that the amount of light received by the second reading unit 19 is less than a threshold, for example. In this case, the operation panel 8 may be controlled to notify the second reading unit 19 that a problem has occurred.

  In the embodiment of the present invention, when the image forming apparatus 1 transitions from the power OFF state to the power ON state, the condensation occurrence determination processing by the control unit 9 is started, but the present invention is not limited to this. For example, the control unit 9 may execute the condensation occurrence determination process to the extent that the convenience of the user is not impaired. The control unit 9 may execute, for example, condensation occurrence determination processing every predetermined time.

  In the drawings, each component is schematically shown mainly for ease of understanding, and the thickness, length, etc. of each component illustrated are different from the actual for convenience of drawing creation. . Further, the shapes and the like of the components shown in the above-described embodiment are merely examples, and are not particularly limited, and various modifications can be made without substantially departing from the effects of the present invention.

  The present invention relates to an image reading apparatus and an image forming apparatus, and is useful for eliminating condensation that occurs in the image reading apparatus and improving the convenience of the user at the time of condensation.

DESCRIPTION OF SYMBOLS 1 image forming apparatus 4 image forming unit 9 control unit 10 image reading device 10 a document reading unit 10 b document conveyance unit 12 first reading unit 19 second reading unit R document

Claims (5)

An original conveyance unit that conveys an original along a conveyance path;
A document reading unit that reads an image from the document conveyed by the document conveyance unit;
And a control unit that controls the document conveyance unit and the document reading unit.
The document reading unit
A first reading unit that reads an image formed on the surface of the document;
And a second reading unit that reads an image formed on the back side of the document.
The control unit
Determining whether the first reading unit and the second reading unit can read the image;
The document reading unit is controlled such that the other reading unit reads the image when it is determined that one of the first reading unit and the second reading unit can not read the image. Image reading device. It further comprises a display unit for displaying a screen,
The control unit controls the display unit to display the screen when it is determined that the one reading unit can not read the image;
The image reading apparatus according to claim 1, wherein the screen indicates that the one reading unit can not read the image and the other reading unit can read the image. A first detection unit that detects an air temperature outside the image reading device and generates first temperature information indicating the air temperature;
A second detection unit that detects a temperature near the first reading unit and generates second temperature information indicating a temperature near the first reading unit;
A third detection unit configured to detect a temperature near the second reading unit and generate third temperature information indicating a temperature near the second reading unit;
A humidity measurement unit that measures humidity outside the image reading device and generates humidity information indicating the humidity;
The control unit
It is determined whether the first reading unit can read the image based on the first temperature information, the second temperature information, and the humidity information.
The image reading apparatus according to claim 1, wherein it is determined whether the second reading unit can read the image based on the first temperature information, the third temperature information, and the humidity information. . The first reading unit includes a first light source that emits light.
The second reading unit includes a second light source that emits light.
The control unit
The first reading unit is controlled such that light is emitted from the first light source when it is determined that the first reading unit can not read the image;
The image reading apparatus according to claim 3, wherein the second reading unit is controlled to emit light from the second light source when it is determined that the second reading unit can not read the image. An image reading apparatus according to any one of claims 1 to 4;
An image forming unit for forming the image on a recording medium;

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