Electronic equipment and image forming apparatus

Abstract

This allows the device's power state to be switched to a state appropriate for the user without using high-quality motion sensors. [Solution] In the image forming apparatus 10, the control unit 31 performs a transition process to move the image forming apparatus 10 from a first power state to a second power state that consumes less power than the first power state, thereby setting the second power state. When a person is detected by the human presence sensor 25, the control unit 31 performs a recovery process to set the first power state, thereby setting the first power state. If a user is detected by the human presence sensor 25 while the transition process is being executed, the control unit 31 interrupts the transition process and maintains the state in the process of transitioning from the first power state to the second power state. When the interruption time of the transition process reaches a certain period of time, the control unit 31 resumes the transition process and sets the second power state.

Description

Technical Field

[0004] , , , , , , , , , , , ,

[0001] The present invention relates to an electronic device and an image forming apparatus that appropriately switch between a first power state and a second power state in which power consumption is lower than the first power state, and particularly relates to a technique for switching between the first power state and the second power state based on the detection output of a human presence sensor.

Background Art

[0002] As an example of an electronic device, an image forming apparatus includes an image reading device that reads an image of a document, and an image forming unit that forms the read image of the document on a recording sheet. Further, in the image forming apparatus, a first power state (normal power mode) in which power consumption necessary for the operation of the image forming apparatus is supplied, and a second power state (power saving mode) in which power consumption is lower than the first power state are appropriately switched to reduce power consumption while operating the image forming apparatus.

[0003] In the image processing apparatus described in Patent Document 1, when a user is detected by a human presence sensor, it shifts from a second power state (power saving mode) to a first power state (normal power mode), and when a shift to the second power state is instructed by a user operation, it shifts from the first power state to the second power state, and at this time, the shift to the first power state is prohibited until the user is no longer detected by the human presence sensor. As a result, even though it has shifted from the first power state to the second power state in response to a user operation, the phenomenon that a user who is trying to leave the image processing apparatus is detected by the human presence sensor and returns to the first power state is prevented.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In Patent Document 1, when transitioning from the first power state to the second power state, the transition back to the first power state is prohibited until the motion sensor no longer detects a user. This prevents the phenomenon where the motion sensor detects a user attempting to leave the image processing device and causes it to revert to the first power state. However, even if another user approaches immediately after the first user leaves and the motion sensor detects the other user, the second power state is maintained and the first power state is not set, preventing the other user from operating the image processing device.

[0006] Furthermore, if a motion sensor capable of distinguishing between approaching and moving away users is applied, it would be possible to distinguish between a user moving away and another user approaching, and accurately set the first or second power state. However, applying such a high-quality motion sensor would lead to increased costs.

[0007] This invention has been made in view of the above circumstances, and aims to enable the switching of the power state of a device to a state appropriate for the user without the need for a high-quality motion sensor. [Means for solving the problem]

[0008] An electronic device according to one aspect of the present invention comprises a human presence sensor that detects a person within a predetermined range from the electronic device, an operation unit that receives instructions from an operation unit, and a control unit that sets the electronic device to a first power state in which it is normally in a standby state, or to a second power state that consumes less power than the first power state, and when the electronic device is set to the second power state and a person is detected by the human presence sensor, it moves the electronic device to the first power state, wherein the control unit, when a transition instruction to move from the first power state to the second power state is input to the operation unit, executes a transition process to move the electronic device from the first power state to the second power state and sets the electronic device to the second power state, interrupts the transition process and maintains the state in the process of transitioning from the first power state to the second power state, and resumes the transition process when the interruption time of the transition process reaches a predetermined period of time, and sets the second power state after the transition process.

[0009] An image forming apparatus according to one aspect of the present invention comprises an electronic device according to one aspect of the present invention and an image forming unit that forms an image on a recording medium. [Effects of the Invention]

[0010] According to the present invention, it is possible to switch the power state of a device to a state appropriate for the user without using a high-quality motion sensor. [Brief explanation of the drawing]

[0011] [Figure 1] This is a cross-sectional view showing an image forming apparatus according to one embodiment of the present invention. [Figure 2] This is a block diagram showing the main configuration of the image forming apparatus of this embodiment. [Figure 3] This flowchart shows the control procedure for switching between the first and second power states of an image forming apparatus. [Figure 4]This timing chart shows the process from when the first power state is set, through the transition process from the first power state to the second power state, setting the second power state, and then setting the first power state again in response to user detection by the motion sensor. [Figure 5] This timing chart shows the process from the interruption of the transition process from the first power state to the second power state in response to user detection by a human presence sensor, to the user's operation on the image forming apparatus during the interruption of the transition process, until the first power state is set. [Figure 6] This timing chart shows the process from interrupting the transition from the first power state to the second power state in response to user detection by a motion sensor, to resuming the interrupted transition process, and finally setting the second power state. [Figure 7] This flowchart shows a modified control procedure for switching between the first and second power states of an image forming apparatus. [Modes for carrying out the invention]

[0012] Hereinafter, an electronic device and an image forming apparatus according to one embodiment of the present invention will be described with reference to the drawings. Figure 1 is a cross-sectional view showing an image forming apparatus according to one embodiment of the present invention. As shown in Figure 1, the image forming apparatus 10 of this embodiment is an MFP (multifunction printer) that combines multiple functions such as a copy function, a printer function, and a facsimile function. This image forming apparatus 10 comprises an image reading unit 11 and an image forming unit 12. The image forming apparatus 10 is also an example of an electronic device according to the present invention.

[0013] The image reading unit 11 has an image sensor (such as a CCD sensor) that optically reads the image of the document, and the analog output of this image sensor is converted into a digital signal to generate image data that represents the image of the document.

[0014] The image forming unit 12 forms an image indicated by the above image data on a recording paper, and includes an image forming unit 3M for magenta, an image forming unit 3C for cyan, an image forming unit 3Y for yellow, and an image forming unit 3Bk for black. In any of the image forming units 3M, 3C, 3Y, and 3Bk, the surface of the photosensitive drum 4 is uniformly charged, the surface of the photosensitive drum 4 is exposed to form an electrostatic latent image on the surface of the photosensitive drum 4, the electrostatic latent image on the surface of the photosensitive drum 4 is developed into a toner image, and the toner image on the surface of the photosensitive drum 4 is primarily transferred to the intermediate transfer belt 5. As a result, a color toner image is formed on the intermediate transfer belt 5. This color toner image is secondarily transferred to the recording paper P conveyed through the conveyance path 8 from the paper feeding unit 14 in the nip area N between the intermediate transfer belt 5 and the secondary transfer roller 6.

[0015] After that, the recording paper P is heated and pressurized by the fixing device 15, the toner image on the recording paper P is fixed by thermocompression bonding, and further the recording paper P is discharged to the discharge tray 17 through the discharge roller 16.

[0016] Next, FIG. 2 is a block diagram showing the main internal configuration of the image forming apparatus 10 of the present embodiment. As shown in FIG. 2, the image forming apparatus 10 of the present embodiment includes an image reading unit 11, an image forming unit 12, a display unit 21, an operation unit 22, a touch panel 23, a human sensor 25, a communication unit 26, a storage unit 28, and a control unit 29. These components can transmit and receive data or signals to and from each other through a bus.

[0017] The display unit 21 is composed of a liquid crystal display (LCD) or an organic EL (OLED) display.

[0018] The operation unit 22 includes physical keys such as a numeric keypad, an enter key, and a start key. The operation unit 22 receives an input of an instruction according to an operation of each of the above keys by the user.

[0019] On the screen of the display unit 21, a touch panel 23 is arranged. The touch panel 23 is a touch panel such as a so-called resistive film method or a capacitance method, and detects the contact (touch) of a user's finger or the like with the touch panel 23 together with the contact position, and outputs a detection signal indicating the coordinates of the contact position to a control unit 31 (described later) of the control unit 29 and the like.

[0020] The human sensor 25 is a known sensor that detects a person in front of the image forming apparatus 10. For example, the human sensor 25 is an infrared sensor that detects infrared rays emitted from the human body.

[0021] The communication unit 26 is a communication interface and transmits and receives data to and from an external device such as a server through a network (such as an intranet).

[0022] [[ID=B]]

[0023] <000S0104> The control unit 29 is composed of a processor, a RAM (Random Access Memory), a ROM (Read Only Memory), and the like. The processor is, for example, a CPU (Central Processing Unit), an ASIC (Application Specific Integrated Circuit), or an MPU (Micro Processing Unit), etc. The control unit 29 functions as a control unit 31 when a control program stored in the above ROM or the storage unit 28 is executed by the above processor.

[0024] The control unit 31 comprehensively controls the image forming apparatus 10. The control unit 29 is connected to the image reading unit 11, image forming unit 12, display unit 21, operation unit 22, touch panel 23, human presence sensor 25, communication unit 26, and storage unit 28, etc. The control unit 31 controls the operation of these components and transmits and receives signals or data between each of these components.

[0025] The control unit 31 functions as a processing unit that performs various processes necessary for image formation by the image forming apparatus 10. The control unit 31 also has the function of controlling the display operation of the display unit 21 and the communication operation of the communication unit 26.

[0026] Furthermore, the control unit 31 receives operation instructions input by the user based on detection signals output from the touch panel 23 or operations on the physical keys of the operation unit 22. For example, the control unit 31 receives instructions in response to touch operations on the GUI (Graphical User Interface) displayed on the screen of the display unit 21 via the touch panel 23.

[0027] Furthermore, the control unit 31 acquires the detection output of the human presence sensor 25 and detects the presence or absence of a person based on whether this detection output is above a preset threshold, that is, whether the signal output from the human presence sensor 25 is a human presence detection signal indicating the detection of a person.

[0028] In an image forming apparatus 10 with this configuration, for example, when a user places a document in the image reading unit 11 and operates the start key on the operation unit 22, the control unit 31 causes the image reading unit 11 to read the image of the document, and the image forming unit 12 to print this image onto recording paper.

[0029] Furthermore, the control unit 31 of the image forming apparatus 10 appropriately switches between a first power state (normal power mode) in which the image forming apparatus 10 is in standby mode for normal operation, and a second power state (power saving mode; so-called sleep mode) in which less power is supplied than in the first power state. The first power state is a state in which the power required for the normal operation of the image forming apparatus 10 is supplied, for example, the power required for the operation of the display unit 21, communication unit 26, storage unit 28, image reading unit 11, and image forming unit 12. The second power state is a state in which the power required for the operation of the display unit 21, communication unit 26, storage unit 28, image reading unit 11, and image forming unit 12 is reduced or its supply is stopped.

[0030] However, in both the first and second power states, power is supplied to the human presence sensor 25, and detection by the human presence sensor 25 is performed. In addition, power is supplied to the touch panel 23 and each of the sensors, which are predetermined devices for detecting user operations, such as the touch panel 23, the sensors for detecting key operations on the operation unit 22, and the sensors for detecting documents set in the image reading unit 11, and detection by the touch panel 23 and each of the sensors is performed.

[0031] Furthermore, the touch panel 23 and each sensor correspond to an operation detection unit that detects user operations as defined in the claims.

[0032] When the control unit 31 of the image forming apparatus 10 is in the second power state and a user is detected by the motion sensor 25, it sets the image forming apparatus 10 to the first power state, enabling the normal operation of the image forming apparatus 10.

[0033] Furthermore, when the control unit 31 of the image forming apparatus 10 is in a state where the first power state is set, and the user inputs a transition instruction to the operation unit 22 to transition from the first power state to the second power state, the control unit 31 performs a transition process to transition the image forming apparatus 10 to the second power state and sets the second power state.

[0034] In image forming apparatuses other than those of this embodiment, even if the system transitions from the first power state to the second power state, if the motion sensor 25 detects a user attempting to leave the image forming apparatus 10, the system may revert to the first power state. Furthermore, if the transition to the first power state is prohibited until the motion sensor 25 no longer detects a user, as in Patent Document 1, then if another user approaches immediately after a user leaves, the motion sensor will detect the other user, causing the second power state to remain active and the first power state not to be set. As a result, the other user will be unable to operate the image forming apparatus.

[0035] In contrast, the control unit 31 of the image forming apparatus 10 according to this embodiment interrupts the transition process from the first power state to the second power state if a user is detected by the motion sensor 25 during the execution of the transition process. At this time, the control unit 31 maintains the state in the process of transitioning from the first power state to the second power state. The control unit 31 does not perform any processing such as prohibiting the transition to the first power state until the motion sensor 25 no longer detects a user, as described above.

[0036] Then, when the interruption time T1 of the transition process reaches a predetermined time (for example, 3 to 5 seconds) Δt1, the control unit 31 resumes the transition process and sets a second power state in the image forming apparatus 10. It is assumed that the user leaves the image forming apparatus 10 while the transition process is interrupted, and the second power state is set when the transition process is resumed.

[0037] Furthermore, if, during an interruption in the transition process, a user leaves the image forming apparatus 10, another user approaches the image forming apparatus 10, and the other user operates the image forming apparatus 10, the control unit 31 executes a recovery process to return to the first power state and sets the first power state. For example, the control unit 31 executes the recovery process and sets the first power state when a recovery instruction to return the image forming apparatus 10 from the second power state to the first power state is input to the operation unit 22, or when user operation is detected by the touch panel 23 and each sensor acting as an operation detection unit. Therefore, even in the middle of the transition process from the first power state to the second power state, if another user operates the image forming apparatus 10, it immediately returns to the first power state, and the other user can operate and run the image forming apparatus 10.

[0038] Next, the control procedure for switching between the first and second power states of the image forming apparatus 10 as described above will be explained in detail with reference to the flowchart shown in Figure 3.

[0039] The control unit 31 of the image forming apparatus 10, while the first power state is set (S101), determines whether a user has input an instruction to transition from the first power state to the second power state to the operation unit 22 (S102).

[0040] If the control unit 31 does not determine that the above transition instruction has been input (S102 "No"), it does not set the second power state and maintains the first power state (S101).

[0041] Furthermore, if the control unit 31 determines that the above transition instruction has been input (S103 "Yes"), it starts a transition process to transition from the first power state to the second power state in accordance with the transition instruction (S103).

[0042] Furthermore, the GUI and touch panel 23 displayed on the display unit 21 may also accept the above transition instructions as operating units within the scope of the claims.

[0043] Furthermore, the transition process involves setting a second power state in place of the first power state, which reduces or stops the power consumption necessary for the operation of, for example, the display unit 21, the communication unit 26, the storage unit 28 (HDD), the control unit 31, the image reading unit 11, and the image forming unit 12. This is performed according to a pre-set procedure. For example, in the second power state, the backlight of the display unit 21 is turned off, the communication unit 26 is stopped, the storage unit 28 (HDD) is stopped, and the print engine executed by the control unit 31 is stopped. Also, in the image reading unit 11, the power consumption of the drive source such as the motor is reduced, and the light source that illuminates the image on the document is turned off. In the image forming unit 12, the power consumption of the drive source such as the motor is reduced, and the power consumption of the heater of the fixing device is reduced.

[0044] During the execution of the transition process, the control unit 31 determines whether a user has been detected by the motion sensor 25 (S104) and whether the transition process has been completed (S105).

[0045] At this time, if the control unit 31 determines that the transition process has ended (S105 "Yes") without determining that a user has been detected by the motion sensor 25 (S104 "No"), it sets the second power state (S106).

[0046] After setting the second power state, the control unit 31 waits for a user to be detected by the motion sensor 25 (S107 "No"). When a user is detected (S107 "Yes"), it performs a recovery process to transition from the second power state to the first power state, sets the first power state (S108), and returns to S101.

[0047] The process up to S108 described above will be explained using a timing chart. Figure 4 is a timing chart showing the process from when the first power state is set, through the execution of the transition process from the first power state to the second power state, setting the second power state, and then setting the first power state again in response to the detection of a user by the motion sensor 25.

[0048] Assuming the first power state is set as shown in Figure 4, at time t11, a transition from the first power state to the second power state is instructed, and the transition process from the first power state to the second power state is started. At time t12, when the transition process is completed, the second power state is set. Furthermore, at time t13 while in the second power state, if a user is detected by the motion sensor 25, the recovery process is started, and at time t14, when the recovery process is completed, the first power state is set. Note that in Figure 4, the execution period of the transition process is indicated by "Enabled," and the non-execution period of the transition process is indicated by "Disabled" (the same applies to Figures 5 and 6 described later).

[0049] Furthermore, in S105, if the control unit 31 does not determine that the transition process has finished (S105 "No"), it determines whether a user has been detected by the motion sensor 25 (S104). If the control unit 31 determines that a user has been detected by the motion sensor 25 (S104 "Yes"), it interrupts and pauses the transition process (S109), maintains the state in the process of transitioning from the first power state to the second power state, and starts timing the interruption time T1 from the point in time when the transition process was interrupted (S110).

[0050] The control unit 31 then determines whether the interruption time T1 has reached a predetermined fixed time Δt1 (S111), and whether or not a user has performed an operation on the image forming apparatus 10 (S112).

[0051] Here, user operations on the image forming apparatus 10 include inputting instructions to the operation unit 22, user operations on the touch panel 23, user operations on the operation unit 22, and user operations such as setting a document in the image reading unit 11. The control unit 31 makes a determination based on the output from the operation unit 22, the detection output from the touch panel 23, the detection output from the sensor that detects the operation of the keys on the operation unit 22, and the detection output from the sensor that detects the document set in the image reading unit 11.

[0052] Furthermore, the user operation determined in S112 is distinct from the user operation on the GUI and touch panel 23 used to instruct the transition from the first power state to the second power state, which is determined in S102.

[0053] For example, if the control unit 31 determines that a user has performed an operation on the image forming apparatus 10 before it has determined that the interruption time T1 has reached a certain time Δt1 (S111 "No") (S112 "Yes"), it stops the transition process (S113), starts the recovery process to set the first power state, and sets the first power state (S114). After this, the process returns to S101.

[0054] The recovery process, in contrast to the transition process, is a process that sets the first power state by starting the supply of power necessary for the operation of the display unit 21, communication unit 26, storage unit 28 (HDD), control unit 31, image reading unit 11, and image forming unit 12, etc., and is performed by the control unit 31 in a predetermined procedure. For example, the backlight of the display unit 21 is turned on, the communication unit 26 is started, the storage unit 28 (HDD) is started, and the print engine executed by the control unit 31 is started. Also, in the image reading unit 11, the drive source such as the motor is started and the light source that illuminates the image on the document is turned on. In the image forming unit 12, the drive source such as the motor is started and the heater of the fixing device is started.

[0055] As described above, when the transition process is interrupted (S109), the state in the process of transitioning from the first power state to the second power state is maintained. Therefore, the time required for the recovery process when setting the second power state from the interrupted transition process is shorter than the time required for the recovery process when setting the first power state from the second power state. Consequently, the first power state is quickly set by the user operation determined in S112.

[0056] The process when the transition process is interrupted is explained using a timing chart. Figure 5 is a timing chart showing the process from when the transition process from the first power state to the second power state is interrupted in response to the detection of a user by the human presence sensor 25, until the user operates the image forming apparatus 10 during the interruption of the transition process and sets the first power state.

[0057] As shown in Figure 5, at time t11, a transition process is started to move from the first power state to the second power state. At time t21, when a user is detected by the motion sensor 25, the transition process is interrupted and the process is interrupted. At time t22, while the process is interrupted, if the user performs an operation on the image forming apparatus 10, a recovery process is started. At time t23, when the recovery process is completed, the first power state is set.

[0058] Returning to the flowchart in Figure 3, if the control unit 31 determines that the interruption time T1 has reached a certain time Δt1 without determining that a user operation has been performed on the image forming apparatus 10 (S112 "No"), the control unit 31 resumes the interrupted transition process (S115) and sets the second power state upon completion of the transition process (S106).

[0059] The process of resuming the interrupted transition process will be explained using a timing chart. Figure 6 is a timing chart showing the process from interrupting the transition process from the first power state to the second power state in response to user detection by the motion sensor 25, to resuming the interrupted transition process, and setting the second power state.

[0060] As shown in Figure 6, at time t11, a transition process to move from the first power state to the second power state is initiated. At time t31, a user is detected by the motion sensor 25, and the transition process is interrupted. At time t32, when the interruption time T1 reaches a certain time Δt1, the interrupted transition process is resumed, and at time t33, when the transition process is completed, the second power state is set.

[0061] Returning to the flowchart in Figure 3, after S106, when the image forming apparatus 10 is in the second power state, the control unit 31, upon detecting a user by the human presence sensor 25 (S107 "Yes"), executes a recovery process to transition the image forming apparatus 10 from the second power state to the first power state and set the first power state (S108). After this, the process returns to S101.

[0062] In this embodiment, if a user is detected by the motion sensor 25 during the transition process from the first power state to the second power state, the transition process is interrupted, and the state in the process of transitioning from the first power state to the second power state is maintained. It is assumed that the user leaves the image forming apparatus 10 while the transition process is interrupted. When the interruption time T1 of the transition process reaches a certain time Δt1, the transition process is resumed, and the second power state is set.

[0063] Furthermore, in this embodiment, if a user other than the user who set the second power state approaches the image forming apparatus 10 during an interruption in the transition process, and the image forming apparatus 10 is operated by the other user, a recovery process to set the first power state is executed to set the first power state. Therefore, even if the transition from the first power state to the second power state is in progress, the first power state is quickly set when another user operates the image forming apparatus 10.

[0064] Furthermore, it eliminates the need to apply motion sensors that can distinguish between approaching and moving away users, thus avoiding increased costs. <Transformed form>

[0065] Figure 7 is a flowchart showing a modified control procedure for switching between the first and second power states of the image forming apparatus 10.

[0066] In the modified control procedure shown in Figure 7, the control unit 31 simultaneously determines whether or not a transition from the first power state to the second power state has been instructed (S102) and whether or not the duration T2 during which the image forming apparatus 10 does not perform job-based operations has reached a predetermined time Δt2 (S102A).

[0067] The control unit 31 of the image forming apparatus 10, while the first power state is set (S101), determines whether or not a transition from the first power state to the second power state has been instructed based on user operation via the touch panel 23 on the GUI displayed on the display unit 21 (S102), and also measures the duration T2 of the image forming apparatus 10 and determines whether or not this duration T2 has reached a predetermined time Δt2 (S102A).

[0068] If the control unit 31 does not determine that an instruction to transition from the first power state to the second power state has been input to the operation unit 22 based on the user's operation (S102 "No"), and also determines that the duration T2 of the image forming apparatus 10 has not reached the specified time Δt2 (S102A "No"), it maintains the first power state (S101).

[0069] Furthermore, if the control unit 31 determines that the above transition instruction has been input to the operation unit 22 (S102 "Yes"), or determines that the above duration T2 of the image forming apparatus 10 has reached a specified time Δt2 (S102A "Yes"), it starts a transition process to transition from the first power state to the second power state (S104). After this, the processes S105 to S115 described in the above embodiment are performed.

[0070] In the above embodiment, the fixed time Δt1 compared with the interruption time T1 is a preset time, but this fixed time Δt1 may be set arbitrarily by the user. For example, the control unit 31 sets the fixed time Δt1 to any time indicated by the instruction input to the operation unit 22.

[0071] Furthermore, the configurations and processes of the embodiments and modified examples described with reference to Figures 1 to 7 are merely examples of the present invention, and are not intended to limit the present invention to such configurations and processes. [Explanation of Symbols]

[0072] 10 Image forming apparatus 11 Image reading unit 12 Image forming unit 21 Display section 22 Control section 23 Touch panel 25 motion sensors 26 Communications Department 28 Memory section 29 Control Unit 31 Control Unit

Claims

1. It is an electronic device, A human presence sensor that detects a person within a predetermined range from the aforementioned electronic device, The control unit receives instructions from the control unit, The electronic device is set to a first power state in which it is in standby mode for normal operation, or to a second power state in which it consumes less power than the first power state, and the control unit is set to the second power state and when a person is detected by the motion sensor at the time the second power state is set, the control unit is set to switch the electronic device back to the first power state. The control unit, When a transition instruction to transition from the first power state to the second power state is input to the operation unit, a transition process is executed to transition the electronic device from the first power state to the second power state, and the second power state is set for the electronic device. If a person is detected by the motion sensor during the execution of the transition process, the transition process is interrupted, and the state in the process of transitioning from the first power state to the second power state is maintained. An electronic device that, when the interruption time of the transition process reaches a predetermined period of time, resumes the transition process and sets the second power state after the transition process.

2. The device further includes an operation detection unit that detects user operations on the electronic device, The electronic device according to claim 1, wherein the control unit, during the interruption of the transition process, executes a recovery process to return the electronic device from the second power state to the first power state when a recovery instruction to return the electronic device from the second power state to the first power state is input to the operation unit, or when a user operation is detected by the operation detection unit, thereby setting the electronic device to the first power state.

3. The electronic device according to claim 1, wherein the control unit sets any time indicated by the instruction input to the operation unit as the constant time.

4. The control unit, The duration for which the electronic device does not perform job-based operations while the first power state is set is measured, and when the duration reaches a predetermined time, the transition process is executed to set the electronic device to the second power state. The electronic device according to claim 1, wherein if a person is detected by the motion sensor while the transition process is being executed due to the duration reaching the predetermined time, the transition process is interrupted to maintain the state in the process of transitioning from the first power state to the second power state, and when the interruption time of the transition process reaches a predetermined period of time, the transition process is resumed and the second power state is set after the transition process.

5. The electronic device according to any one of claims 1 to 4, An image forming apparatus comprising an image forming unit that forms an image on a recording medium.

Images