JP6410634B2 - Electronic equipment with power saving function - Google Patents

Description

  The present invention relates to an electronic device having a power saving function such as an image forming apparatus installed in an office or the like, and in particular, can return from a power saving state to a normal state in a time corresponding to the frequency of use of the electronic device. It relates to electronic equipment.

  As one type of image processing apparatus that is an electronic device, an image forming apparatus (typically a copier) that forms an image on recording paper is introduced in many offices (company, office, etc.). A multifunction peripheral (MFP (Multi Function Peripheral)), which is one type of such an image forming apparatus, has a copy mode, a facsimile mode (hereinafter referred to as a facsimile), a network compatible printer mode, and a scanner mode. A plurality of basic operation modes are provided.

  In recent years, energy saving has been proposed, and devices that are constantly energized and used in offices have a function of transitioning to a power saving state (hereinafter also referred to as an energy saving state or an energy saving mode). For example, in the image forming apparatus, a schedule for shifting from a normal standby state (a state in which an instructed function (copying or the like) can be immediately executed) to an energy saving mode with low power consumption is set.

  A power saving function (energy saving function) of a conventional image forming apparatus will be described with reference to FIG. When the power is turned on, the image forming apparatus supplies power to each unit, performs warm-up, and then enters a standby state at time T1, that is, a state in which normal operation is possible. Thereafter, when a predetermined time (first time Δt1) elapses without the image forming apparatus being operated (time T2), the image forming apparatus transitions to a preheating state. The preheating state is a state in which, for example, the power consumption is reduced by lowering the temperature of the fixing unit for image formation on the recording paper. This state has a lower power saving rate than an auto power shut-off state described later, but can return to a standby state in a relatively short time when an operation is received.

  Further, when a predetermined time (second time Δt2) elapses in the preheated state (time T3), the image forming apparatus enters an auto power shut-off state. The auto power shut-off state is a state in which the power supply to the operation unit and the fixing unit is stopped when the operation unit is not operated, and the power consumption is minimized to stand by.

  When the user performs a return operation such as pressing a predetermined button in the auto power shut off state (time Ta), the image forming apparatus returns from the auto power shut off state to the standby state. In the auto power shut-off state, the power saving rate is high, but it takes a relatively long time to return when an operation is received.

  Such an image forming apparatus having an energy saving function is set with a schedule as shown in FIG. 2 and realizes an energy saving function according to the use state of the image forming apparatus. Different standby periods (first time Δt1 and second time Δt2) are set for each level in FIG. The standby period is set as shown in Table 1, for example.

  That is, level 1 is set in a time zone where the use frequency of the image forming apparatus is high (the standby period is relatively long), and level 3 is set in a time zone where the usage frequency is low (the standby period is relatively short). Level 2 is set in the time zone of the usage frequency (normal usage frequency) between them (the waiting period is intermediate between levels 1 and 2).

  For example, the first time Δt1 and the second time Δt2 are set such that when the first time Δt1 becomes longer, the second time Δt2 also becomes longer. The standby period may be set such that the first time Δt1 is constant and the second time Δt2 (preheating period) is different.

  Patent Document 1 below discloses an electronic device that uses both power supplied from an external power supply such as a commercial power supply and power supplied from a secondary battery. This electronic device has an operation mode, a sleep mode, and an energy saving mode. In the operation mode, the electronic device supplies the power of the commercial power source to the image forming unit and the external interface that receives the job, and executes the received image forming job. In the sleep mode, the electronic device supplies the power of the commercial power supply to the external interface without supplying it to the image forming unit, and accepts an execution instruction for the image forming job. In the energy saving mode, the electronic device does not supply the power of the commercial power source to the image forming unit and the external interface, but supplies the power of the secondary battery to the external interface and receives an instruction to execute the image forming job. Regarding the mode transition, when the image forming job is not executed within the business hours of the company or the like, the mode is switched to the sleep mode, and when the external interface accepts the execution instruction of the image forming job, the operation mode is switched to the image forming. It is disclosed that when the job is executed and the image forming job is completed, the mode returns to the sleep mode. Further, it is disclosed that the mode is shifted to the energy saving mode in a time zone that is out of business hours (such as at night) and the image forming apparatus is not used much.

  Patent Document 2 below discloses an energy optimum operation system that sets a time period for shifting to power saving in a large ship or the like according to a time zone. This system predicts demand for the required propulsion power, the amount of heat required for heating the auxiliary equipment, and the amount of heat for air conditioning, based on the onboard energy prediction model including the residential area, the advance operation plan, and prediction information. And the output ratio of each of the plurality of engines is optimized based on the demand forecast. Based on the optimum conditions, it is disclosed that the propulsion power is predicted from the operation plan / time, number of passengers, weather forecast, sea state forecast using the ship's energy forecast model, and the energy management plan for the entire ship is drafted. ing.

  Further, in Patent Document 3 below, it is possible to optimize the transition schedule to the energy saving mode set in each of a plurality of image forming apparatuses installed in an office or the like, thereby realizing an appropriate operation as a whole office. An image forming system is disclosed.

JP 2014-53999 A JP 2014-125123 A JP 2014-78269 A

  As described above, a predetermined energy saving effect can be obtained also by the conventional technique. However, it is preferable to realize further energy saving.

  Conventionally, various proposals have been made regarding the transition of the image forming apparatus to the energy-saving state, but there has been no sufficient study regarding the return of the image forming apparatus from the energy-saving state to the normal state. Therefore, despite the high usage frequency of the image forming apparatus, it still takes time to return from the energy-saving state to the normal state, resulting in a decrease in work efficiency and causing the user to feel stress. Can occur. The above Patent Documents 1 to 3 cannot solve these problems.

  Therefore, the present invention provides an electronic device that can make a transition to an energy saving level according to the frequency of use of an electronic device such as an image forming apparatus and can return to a standby state in a time that depends on the frequency of use of the electronic device. The purpose is to do.

  The electronic device which concerns on the 1st aspect of this invention is an electronic device which changes an operation state according to the energy-saving level set for every time slot | zone. The electronic device is an electronic device that changes its operating state according to the energy saving level set for each time zone. The electronic device has a storage unit that stores a schedule including an energy saving level, a determination unit that reads the schedule from the storage unit and determines an energy saving level corresponding to the current time zone, and a control unit that controls the power consumption state of the electronic device And a predetermined button. When a predetermined time has passed while the electronic device is in a standby state, the control unit receives the fact that the determination unit determines that the energy saving level corresponding to the current time zone is the first energy saving level. The device is changed to the first energy saving level, and the electronic device is changed to the second energy saving level when the determination unit determines that the energy saving level corresponding to the current time zone is the second energy saving level. In response to the operation of a predetermined button, the electronic device is shifted to a standby state. The power consumption of the electronic device decreases in the order of the standby state, the first energy saving level, and the second energy saving level.

  Thereby, according to the schedule set beforehand according to the usage frequency of an electronic device, an electronic device can be changed to an energy saving state, and can be returned from an energy saving state to a standby state. In the schedule, if the first energy-saving level is set during the high-usage time period and the second energy-saving level is set during the low-usage time period, high energy-saving is achieved in the low-usage time period. A power effect can be realized. Further, in a time zone where the frequency of use is high, when the return button is pressed, it is possible to quickly return to the standby state.

  The electronic device which concerns on the 2nd aspect of this invention is an electronic device which changes an operation state according to the energy-saving level set for every time slot | zone. The electronic device is an image forming apparatus, a storage unit that stores a schedule including an energy saving level, a determination unit that reads the schedule from the storage unit and determines an energy saving level corresponding to the current time zone, and power consumption of the electronic device A control unit for controlling the state and a predetermined button are included. The control unit transitions the electronic device to a preheating state in which the heater temperature of the fixing unit used for image formation is lowered in response to the elapse of a predetermined time while the electronic device is in a standby state, and the electronic device is preheated. When the predetermined first time has passed in the state and the determination unit determines that the energy saving level corresponding to the current time zone is the first energy saving level, the electronic device is switched to the first energy saving level. When the predetermined second time elapses while the electronic device is in the preheated state, the determination unit determines that the energy saving level corresponding to the current time zone is the second energy saving level, The electronic device is shifted to the second energy saving level, and the electronic device is shifted to the standby state in response to the operation of a predetermined button. The power consumption of the electronic device decreases in the order of the standby state, the preheating state, the first energy saving level, and the second energy saving level.

  Thereby, energy saving can be efficiently realized by causing the image forming apparatus to first transition from the standby state to the preheated state. Furthermore, the image forming apparatus can be transitioned from the preheated state to the energy saving state and returned from the energy saving state to the standby state according to a preset schedule according to the use frequency of the image forming apparatus. In the schedule, if the first energy-saving level is set during the high-usage time period and the second energy-saving level is set during the low-usage time period, high energy-saving is achieved in the low-usage time period. A power effect can be realized. Further, in a time zone where the frequency of use is high, when the return button is pressed, it is possible to quickly return to the standby state.

  Preferably, the first time and the second time are equal.

  More preferably, the second time is longer than the first time.

  As a result, in the schedule, if the first energy-saving level is set in the time zone where the usage frequency is high and the second energy saving level is set in the time zone where the usage frequency is low, the time zone where the usage frequency is low is set. Can quickly shift to an energy saving state to achieve a high power saving effect. In addition, when the usage frequency is high, the timing of transition to the energy saving state can be delayed to suppress the reduction in work efficiency. Even if the transition to the energy saving state is made once, when the return button is pressed, It is possible to quickly return to the standby state.

  The electronic device which concerns on the 3rd aspect of this invention is an electronic device which changes an operation state according to the energy-saving level set for every time slot | zone. The electronic device has a storage unit that stores a schedule including an energy saving level, a determination unit that reads the schedule from the storage unit and determines an energy saving level corresponding to the current time zone, and a control unit that controls the power consumption state of the electronic device And a predetermined button. The control unit transitions the electronic device to the first energy saving level in response to the fact that the predetermined first time has passed while the electronic device is in a standby state, and the electronic device maintains the first energy saving level while maintaining the first energy saving level. When the second time has elapsed and the determination unit determines that the energy saving level corresponding to the current time zone is the first energy saving level, the electronic device is maintained at the first energy saving level, and the electronic When the second time elapses while the device maintains the first energy saving level and the determination unit determines that the energy saving level corresponding to the current time zone is not the first energy saving level, the electronic device is In response to the transition to the second energy saving level and the operation of a predetermined button, the electronic device is transitioned to a standby state. The power consumption of the electronic device decreases in the order of the standby state, the first energy saving level, and the second energy saving level.

  Thereby, according to the schedule set beforehand according to the usage frequency of an electronic device, an electronic device can be changed to an energy saving state, and can be returned from an energy saving state to a standby state. In the schedule, if the first energy-saving level is set in the time zone where the usage frequency is high and the second energy saving level is set in the time zone where the usage frequency is low, the electronic equipment is used in the time zone where the usage frequency is low. If is not used, the power consumption can be sequentially reduced with time and a high power saving effect can be realized. Further, in a time zone where the frequency of use is high, when the return button is pressed, it is possible to quickly return to the standby state.

  The electronic device which concerns on the 4th aspect of this invention is an electronic device which changes an operation state according to the energy-saving level set for every time slot | zone. The electronic device is an image forming apparatus, a storage unit that stores a schedule including an energy saving level, a determination unit that reads the schedule from the storage unit and determines an energy saving level corresponding to the current time zone, and power consumption of the electronic device A control unit for controlling the state and a predetermined button are included. The control unit transitions the electronic device to a preheating state in which the heater temperature of the fixing unit used for image formation is lowered in response to the elapse of a predetermined time while the electronic device is in a standby state, and the electronic device is preheated. When the predetermined first time has passed in the state, the electronic device is shifted to the first energy saving level, and the predetermined second time has passed while the electronic device maintains the first energy saving level, and the determination And the electronic device is maintained at the first energy saving level when the energy saving level corresponding to the current time zone is determined to be the first energy saving level. The second time elapses while maintaining, and when the determination unit determines that the energy saving level corresponding to the current time zone is not the first energy saving level, the electronic device is shifted to the second energy saving level. And predetermined In response to the button is operated, shifting the electronic device to the standby state. The power consumption of the electronic device decreases in the order of the standby state, the preheating state, the first energy saving level, and the second energy saving level.

  As a result, the image forming apparatus is first transitioned from the standby state to the preheated state, thereby efficiently realizing energy saving. Furthermore, the image forming apparatus can be shifted to the energy saving state and returned from the energy saving state to the standby state according to a schedule set in advance according to the use frequency of the image forming apparatus. In the schedule, if the first energy-saving level is set in the time zone where the usage frequency is high and the second energy saving level is set in the time zone where the usage frequency is low, image formation is performed in the time zone where the usage frequency is low. If the device is not used, the power consumption can be sequentially reduced with time and a high power saving effect can be realized. Further, in a time zone where the frequency of use is high, when the return button is pressed, it is possible to quickly return to the standby state.

  According to the present invention, an electronic device such as an image forming apparatus can be shifted to an energy-saving level according to the frequency of use of the electronic device according to a preset schedule, and can wait for a time according to the frequency of use of the electronic device. It can be returned to the state.

  For example, in the schedule, the first energy-saving level that has a relatively small effect of reducing power consumption is set in a time zone in which electronic devices are used frequently, and power consumption is reduced in a time zone in which electronic devices are used less frequently. The second energy saving level is set which has a relatively large effect. If set in this way, a high power saving effect can be realized in a time zone where the frequency of use is low, and if the return button is pressed in a time zone where the frequency of use is high, the electronic device is quickly put on standby. It can be returned to the state. Therefore, it is possible to prevent a decrease in work efficiency and avoid stress on the user in a time zone in which the electronic device is used frequently.

6 is a graph showing transition of an operation mode (power consumption state) in a conventional image forming apparatus. It is a figure which shows the schedule for implement | achieving an energy saving function. 1 is a perspective view showing an image forming apparatus according to a first embodiment of the present invention. FIG. 4 is a block diagram illustrating a schematic configuration of the image forming apparatus in FIG. 3. 4 is a graph showing a transition to an energy saving state in the image forming apparatus of FIG. 3. 4 is a flowchart illustrating a control structure of a program for realizing an energy saving function in the image forming apparatus of FIG. 3. 4 is a graph showing return to a standby state in the image forming apparatus of FIG. 3. 6 is a graph showing a transition to an energy saving state in an image forming apparatus according to a second embodiment of the present invention. 10 is a flowchart illustrating a control structure of a program for realizing an energy saving function in the image forming apparatus according to the second embodiment. 6 is a graph showing a transition to an energy saving state in an image forming apparatus according to a third embodiment of the present invention. 10 is a flowchart illustrating a control structure of a program for realizing an energy saving function in an image forming apparatus according to a third embodiment. 10 is a graph showing a return to a normal state in an image forming apparatus according to a third embodiment.

  In the following embodiments, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

(First embodiment)
Referring to FIG. 3, the image forming apparatus 100 includes an image reading unit 110, an image forming unit 120, an operation unit 130, a paper feed unit 140, a manual paper feed tray 146, and a paper discharge processing unit 150. The operation unit 130 includes a touch panel display 132 and an operation key unit 134. The touch panel display 132 includes a display panel configured by a liquid crystal panel and the like, and a touch panel that is disposed on the display panel and detects a touched position. A number of function buttons are arranged on the operation key unit 134 (only the energy saving button 136 is shown in FIG. 3).

  Referring to FIG. 4, in addition to the image reading unit 110, the image forming unit 120, and the operation unit 130, the image forming apparatus 100 includes a control unit 160, a hard disk drive (hereinafter referred to as HDD) 162, and a management unit 164. An image processing unit 166, a communication unit 168, a power supply unit 174, and a timer 176.

  The image reading unit 110 reads a document and inputs image data. The control unit 160 is, for example, a CPU (Central Processing Unit). The control unit 160 uses a ROM (Read Only Memory) (not shown) for storing programs and the like, and a RAM (Random Access Memory) (not shown) which is a volatile storage device. Each unit included in the forming apparatus 100 is controlled. The ROM stores programs and data necessary for controlling the operation of the image forming apparatus 100. The control unit 160 reads the program from the ROM onto the RAM, and executes the program using a part of the RAM as a work area. That is, the control unit 160 controls each part of the image forming apparatus 100 according to a program stored in the ROM, and realizes each function of the image forming apparatus 100.

  The operation unit 130 receives an input of an instruction or the like from the user to the image forming apparatus 100. The communication unit 168 communicates with an external device such as a computer via the network 190. The image forming unit 120 prints image data on a recording sheet. The HDD 162 stores image data. The management unit 164 stores control information, setting information, and the like of the image forming apparatus 100.

  The control unit 160 controls the operation of the entire image forming apparatus 100 based on the information stored in the management unit 164. The image processing unit 166 performs various image processing on the read image data. In addition, the control unit 160 acquires the current time from the timer 176 as appropriate, and operates in a predetermined operation mode according to the schedule stored in the HDD 162. The schedule is set in advance via the operation unit 130 by an administrator or the like. In the normal mode, the control unit 160 controls the power supply unit 174 to supply power supplied to the image forming apparatus 100 from the outside to each unit via a power supply line (not shown). In the energy saving mode, the control unit 160 controls the power supply unit 174 to limit or stop power supply to a predetermined unit (for example, the operation unit 130, a fixing unit described later).

  The paper feed unit 140 includes a first paper feed tray 142 and a second paper feed tray 144. The manual paper feed tray 146 is a tray for manually feeding recording paper.

  Hereinafter, each part of the image forming apparatus 100 will be described more specifically. The image reading unit 110 includes, for example, a CCD (Charge-Coupled Device) 112 as an image reading device, and a document detection sensor 114 that detects a document set on a document table, an automatic document feeder (ADF), or the like. And.

  The operation unit 130 includes an operation key unit 134 having various input keys (hardware keys), and a touch panel display 132 in which a touch panel is disposed on a display panel such as an LCD (Liquid Crystal Display). ing. A user inputs operations and various settings to the image forming apparatus 100 via the operation unit 130.

  When the energy saving button 136 of the operation key unit 134 is operated (pressed), the image forming apparatus 100 transitions to the energy saving state (preheating state) and is in the energy saving state (preheating state or auto power shut) if in the standby state. Transition to the standby state. That is, the energy saving button 136 also functions as a return button for returning the image forming apparatus 100 to the standby state.

  The control unit 160 monitors user operations on the touch panel display 132 and input buttons provided on the operation unit 130, and notifies the touch panel display 132 of information to be notified to the user such as information on the state of the image forming apparatus 100. indicate.

  The image forming unit 120 processes and outputs the image data. The image forming unit 120 includes a memory 122 and a printing unit 124.

  The image forming unit 120 temporarily stores the image data read by the image reading unit 110 in the memory 122, and then stores the image data on the memory 122 in the HDD 162. Further, the image forming unit 120 reads the image data stored in the HDD 162 to the memory 122, transmits it to the printing unit 124, prints it on a recording sheet, and outputs it.

  The HDD 162 stores input image data. The HDD 162 is a magnetic storage medium, and can store a large amount of image data and sequentially process it. As a result, the image forming apparatus 100 can efficiently process instructions from a plurality of users.

  The image processing unit 166 is controlled by the control unit 160 that receives a user instruction from the operation unit 130, reads image data from the memory 122, executes the instructed image processing, and stores the result in the memory 122. . The processed image data is displayed on the touch panel display 132 via the control unit 160. Thereafter, the image data on the memory 122 is transmitted to the printing unit 124 and printed on a recording sheet in response to a user instruction, or output to the network 190 via the communication unit 168. If the image forming apparatus 100 includes a FAX modem and is connected to the telephone line network, the image data on the memory 122 can be output to the telephone line via the FAX modem.

  The printing unit 124 includes an optical scanning device, a developing device, a photosensitive drum, a charger, an intermediate transfer belt unit, a fixing unit, and the like. If the image forming apparatus 100 is an apparatus capable of color printing using toners of each color of black (K), cyan (C), magenta (M), and yellow (Y), a developing device, a photosensitive drum, and Four chargers are provided so as to form four types of latent images corresponding to the respective colors.

  After the electrostatic latent image corresponding to the image data is formed on the photosensitive drum by the optical scanning device, a toner image corresponding to the electrostatic latent image is formed on the photosensitive drum by the developing device. The intermediate transfer belt unit transfers the toner image on the photosensitive drum onto the intermediate transfer belt, and then transfers the toner image onto a recording sheet conveyed from the tray. The fixing unit includes a heat roller and a pressure roller. The heat roller is heated by a heater, and the heat roller and the pressure roller are rotated with the recording paper interposed therebetween, and the multicolor toner image transferred to the recording paper is melted, mixed, and pressed by the thermocompression bonding. Heat fix. As a result, an image is formed on the recording paper.

  Hereinafter, the energy saving function of the image forming apparatus 100 will be described. Here, it is assumed that the same schedule as in FIG. 2 is set in the image forming apparatus 100. Further, it is assumed that the auto power shut-off state includes a plurality of levels (specifically, levels 1 to 3), and each level is determined as shown in Table 2, for example. That is, levels 1 to 3 are for setting the power consumption level of the image forming apparatus 100, unlike the above-described conventional technology.

  At this time, the image forming apparatus 100 controls the operation mode as shown in FIG. When the power is turned on, the image forming apparatus 100 supplies power to each unit, executes warm-up, and then enters a standby state at time T1, that is, a state in which normal operation is possible. Thereafter, when a predetermined time (first time Δt1) elapses without the image forming apparatus 100 being operated (time T2), the image forming apparatus 100 transitions to a preheating state. Further, when a predetermined time (second time Δt2) elapses in the preheated state (time T3), the image forming apparatus 100 enters an auto power shut-off state. At this time, the image forming apparatus 100 transitions to the energy saving mode according to the current time zone according to the schedule. If the energy saving mode in the current time zone is set to level 1 in the schedule, the power consumption level is changed to a relatively high energy saving level. If the energy saving mode in the current time zone is set to level 3, the energy consumption level is changed to a relatively low energy consumption level. If the energy saving mode in the current time zone is set to level 2, the power consumption transitions to an energy saving level between levels 1 and 3.

  In the following, levels 1 to 3 represent information on the energy saving mode set in the schedule and also represent power consumption (energy saving level) at which the actual image forming apparatus 100 transitions.

  With reference to FIG. 6, a control structure of a program for the image forming apparatus 100 to realize the above-described energy saving function will be described. This program is executed by the control unit 160 when the image forming apparatus 100 is powered on.

  In step 300, the control unit 160 acquires information indicating the current time (hereinafter simply referred to as the current time) from the timer 176 and stores it in the RAM.

  In step 302, the control unit 160 determines whether or not a predetermined first time Δt1 has elapsed since the current time was stored in step 300. Specifically, control unit 160 acquires the current time from timer 176, compares the acquired time with the time stored in RAM in step 300, and determines whether or not first time Δt1 has elapsed. . If it is determined that the first time Δt1 has elapsed, the control proceeds to step 306. At this time, the control unit 160 stores the acquired current time in the RAM. Otherwise control passes to step 304.

  In step 304, the control unit 160 determines whether or not the operation unit 130 has been operated. When it is determined that the operation has been performed, the control unit 160 executes the corresponding process, and then the control returns to step 300. For example, the control unit 160 activates a program for executing an instruction corresponding to the operation. Otherwise (if not operated) control returns to step 302.

  When the first time Δt1 elapses without the image forming apparatus 100 being operated, in step 306, the control unit 160 causes the image forming apparatus 100 to transition to a preset preheating state. Specifically, the control unit 160 controls the power supply unit 174 to limit or stop power supply to a predetermined unit in order to enter a preheated state. For example, the power supply to the touch panel display 132 of the operation unit 130 is stopped, the amount of power supplied to the heater of the fixing unit is reduced, and the fixing temperature is lowered.

  In step 308, the control unit 160 determines whether or not a predetermined second time Δt2 has elapsed since the current time was stored in step 302. Specifically, the control unit 160 acquires the current time from the timer 176, compares the acquired time with the time stored in the RAM in step 302, and determines whether or not the second time Δt2 has elapsed. . If it is determined that the time has elapsed, the control proceeds to step 312. Otherwise, control passes to step 310.

  In step 310, the control unit 160 determines whether or not the energy saving button 136 of the operation unit 130 has been operated. When it is determined that the energy saving button 136 has been operated, the control unit 160 controls the power supply unit 174 to resume the power supply to the unit that has been limited or stopped, and then the control proceeds to step 300. Return. As a result, the image forming apparatus 100 transitions to a standby state. Otherwise (if energy saving button 136 is not operated), control returns to step 308.

  When the second time Δt2 further elapses without the image forming apparatus 100 being operated, in step 312, the control unit 160 determines whether or not the energy saving mode corresponding to the current time zone is level 1. The control unit 160 can acquire the current time from the timer 176 and refer to the schedule stored in the HDD 162 at the acquired time to determine the energy saving mode set in the current time zone. If it is determined that the level is 1, the control proceeds to step 314. Otherwise control passes to step 316.

  In step 314, the control unit 160 shifts the image forming apparatus 100 to the level 1 energy saving mode. Thereafter, control proceeds to step 322. Specifically, the control unit 160 controls the power supply unit 174 to limit or stop the power supply to a unit that is predetermined to achieve level 1 in addition to the power control in the preheating state. For example, among the plurality of control boards, processing such as stopping the power supply to the main board while maintaining the power supply to the sub-board and stopping the power supply to the sensor is executed.

  In step 316, the control unit 160 determines whether or not the energy saving mode determined from the schedule in step 312 is level 2. If it is determined that it is level 2, control proceeds to step 318. Otherwise (energy saving mode determined from the schedule is level 3), control proceeds to step 320.

  In step 318, the control unit 160 shifts the image forming apparatus 100 to the level 2 energy saving mode. Thereafter, control proceeds to step 322. Specifically, the control unit 160 controls the power supply unit 174 to limit or stop the power supply to a unit determined in advance to achieve level 2 in addition to the power control in the preheating state. For example, power supply to a plurality of control boards (main board and sub board), sensors, and motors is limited or stopped.

  In step 320, the control unit 160 shifts the image forming apparatus 100 to the level 3 energy saving mode. Thereafter, control proceeds to step 322. Specifically, the control unit 160 controls the power supply unit 174 to limit or stop power supply to a unit that is predetermined for level 3 in addition to power control in the preheated state. For example, power supply to a plurality of control boards (main board and sub board), sensors, motors, fixing unit heaters, and the like is stopped.

  In step 322, the control unit 160 determines whether or not the energy saving button 136 of the operation unit 130 has been operated. When it is determined that the energy saving button 136 has been operated, the control unit 160 controls the power supply unit 174 to resume the power supply to the unit that has been limited or stopped, and then the control proceeds to step 300. Return. Otherwise (when energy saving button 136 is not operated), control unit 160 repeats the process of step 322.

  This program is executed while the power of the image forming apparatus 100 is turned on, and ends when the power of the image forming apparatus 100 is turned off.

  In step 322, the transition to the standby state when it is detected that the energy saving button 136 is operated is as shown in FIG. That is, in FIG. 7, after the image forming apparatus 100 transitions to level 1 in step 314, after the image forming apparatus 100 transitions to level 2 in step 318, or in step 320, the image forming apparatus 100 transitions to level 3. Then, a change in power consumption of the image forming apparatus 100 when the energy saving button 136 is operated at time Ta is schematically shown. As can be seen from FIG. 7, the time required for returning from the level 1 state to the standby state is the shortest, and the time required for returning from the level 3 state to the standby state is the longest. The time required to return from the level 2 state to the standby state is intermediate between the transition from level 1 and level 3.

  In FIG. 7, the transition from the level 1 to the level 3 to the standby state is shown with almost the same slope, but actually, the slopes are not the same. The slope for each level from level 1 to 3 depends on which unit is configured to be limited or stopped at each level. Normally, at level 3, the energization of the unit that takes a relatively long time from the resumption of energization to the return to the normal state, such as the energization of the heater of the fixing unit being stopped, is stopped. Is more gradual than levels 1 and 2, and the time to return to the standby state is longer.

  Therefore, in the schedule of FIG. 2, level 1 is set in a time zone in which the usage frequency of the image forming apparatus 100 is high, and level 3 is set in a time zone in which the usage frequency of the image forming apparatus 100 is low. If level 2 is set in the time zone of use frequency, the image forming apparatus 100 changes to level 1 which is a shallow energy saving mode when changing to the energy saving mode in the time zone of high use frequency. When the button 136 is operated, the image forming apparatus 100 can return to the standby state in a relatively short time. Further, when the image forming apparatus 100 shifts to the energy saving mode in a time zone where the usage frequency is low, the image forming apparatus 100 shifts to the level 3 which is the deep energy saving mode, so that the power consumption is minimized. In addition, when the image forming apparatus 100 shifts to the energy saving mode in the normal usage frequency time zone, the image forming apparatus 100 shifts to the intermediate energy saving mode level 2, so that the power consumption is reduced and the energy saving button 136 is operated. The speed of returning to the standby state in the case can be realized in a well-balanced manner.

(Second Embodiment)
In 1st Embodiment, the time until it changes to the further energy saving mode (auto power shut-off state) from a preheating state was common at levels 1-3. In contrast, in the second embodiment, a different time is set according to the level. The image forming apparatus according to the second embodiment is the same as the image forming apparatus according to the first embodiment, and the reference numerals in FIGS. 3 and 4 are cited.

  The energy saving function of the image forming apparatus 100 according to the present embodiment will be described. Here, it is assumed that the same schedule as in FIG. 2 is set in the image forming apparatus 100. Further, it is assumed that the auto power shut-off state includes a plurality of levels (specifically, levels 1 to 3), and each level is determined as shown in Table 3, for example. The preheating period is a period from when the image forming apparatus 100 starts transitioning to the preheating state until transitioning to a further energy saving mode.

  At this time, the image forming apparatus 100 controls the operation mode as shown in FIG. When the power is turned on, the image forming apparatus 100 supplies power to each unit, performs warm-up, and then enters a standby state at time T1. Thereafter, when a predetermined time (first time Δt1) elapses without the image forming apparatus 100 being operated (time T2), the image forming apparatus 100 transitions to a preheating state. When the period of the preheating state exceeds a predetermined time (second time Δt2) (time T3), if the energy saving mode in the current time zone is set to level 3 in the schedule, the image forming apparatus 100 displays the graph 200. As described above, in the auto power shut-off state, a transition is made to an energy saving mode with relatively low power consumption. However, if the energy saving mode in the current time zone is set to level 1 or level 2, the image forming apparatus 100 maintains the preheating state without transitioning to the auto power shutoff state.

  When the period of the preheating state becomes longer and exceeds a predetermined time (third time Δt3) (time T4), if the energy saving mode in the current time zone is set to level 2 in the schedule, the image forming apparatus 100 As shown in the graph 202, in the auto power shut-off state, a transition is made to an energy saving mode with medium power consumption. However, if the energy saving mode in the current time zone is set to level 1, the image forming apparatus 100 maintains the preheating state without making a transition to the auto power shutoff state.

  When the period of the preheating state becomes longer and exceeds a predetermined time (fourth time Δt4) (time T5), the image forming apparatus 100 consumes relatively less power as shown in the graph 204 in the auto power shutoff state. Transition to high energy saving mode.

  With reference to FIG. 9, a control structure of a program for the image forming apparatus 100 to realize the above-described energy saving function will be described. This program is executed by the control unit 160 when the image forming apparatus 100 is powered on. The flowchart of FIG. 9 is obtained by replacing steps 312 to 320 with steps 340 to 356 in the flowchart of FIG. 6.

  In steps 300 to 310, when the first time Δt1 has elapsed, the control unit 160 causes the image forming apparatus 100 to transition to the preheating state, and determines whether the second time Δt2 has elapsed in the preheating state. In the preheating state, for example, the control unit 160 stops the power supply to the touch panel display 132 of the operation unit 130 and decreases the amount of power supplied to the heater of the fixing unit, thereby lowering the fixing temperature.

  When the second time has elapsed, in step 340, the control unit 160 determines whether or not the energy saving mode corresponding to the current time zone is level 3. The control unit 160 can acquire the current time from the timer 176, refer to the schedule at the acquired time, determine the current time zone, and determine the corresponding energy saving mode. If it is determined that the level is 3, the control proceeds to step 342. Otherwise, control passes to step 344.

  In step 342, the control unit 160 shifts the image forming apparatus 100 to the level 3 energy saving mode. Thereafter, control proceeds to step 322. Specifically, the control unit 160 controls the power supply unit 174 to limit or stop power supply to a unit that is predetermined for level 3 in addition to power control in the preheated state. For example, power supply to a plurality of control boards (main board and sub board), sensors, motors, fixing unit heaters, and the like is stopped. As a result, the power of the image forming apparatus 100 changes as shown by a graph 200 in FIG.

  In step 344, the control unit 160 determines whether or not a predetermined third time Δt3 has elapsed since the current time was stored in step 302. Specifically, control unit 160 acquires the current time from timer 176, compares the acquired time with the time stored in RAM in step 302, and determines whether or not third time Δt3 has elapsed. . If it is determined that the time has elapsed, control proceeds to step 348. Otherwise, control passes to step 346.

  In step 346, the control unit 160 determines whether or not the energy saving button 136 of the operation unit 130 has been operated. When it is determined that the energy saving button 136 has been operated, the control unit 160 controls the power supply unit 174 to resume the power supply to the unit that has been limited or stopped, and then the control proceeds to step 300. Return. As a result, the image forming apparatus 100 transitions to a standby state. Otherwise (if energy saving button 136 is not operated), control returns to step 344.

  In step 348, the control unit 160 acquires the current time from the timer 176, refers to the schedule at the acquired time, and determines whether or not the energy saving mode corresponding to the current time zone is level 2. If it is determined that it is level 2, the control proceeds to step 350. Otherwise, control passes to step 352.

  In step 350, the control unit 160 shifts the image forming apparatus 100 to the level 2 energy saving mode. Thereafter, control proceeds to step 322. Specifically, the control unit 160 controls the power supply unit 174 to limit or stop the power supply to a unit determined in advance to achieve level 2 in addition to the power control in the preheating state. For example, power supply to a plurality of control boards (main board and sub board), sensors, motors, and the like is stopped. As a result, the power of the image forming apparatus 100 changes as shown by a graph 202 in FIG.

  In step 352, the control unit 160 determines whether or not a predetermined fourth time Δt4 has elapsed since the current time was stored in step 302. Specifically, the control unit 160 acquires the current time from the timer 176, compares the acquired time with the time stored in the RAM in step 302, and determines whether or not the fourth time Δt4 has elapsed. . If it is determined that the time has passed, control proceeds to step 356. Otherwise control passes to step 354.

  In step 354, the control unit 160 determines whether or not the energy saving button 136 of the operation unit 130 has been operated. When it is determined that the energy saving button 136 has been operated, the control unit 160 controls the power supply unit 174 to resume the power supply to the unit that has been limited or stopped, and then the control proceeds to step 300. Return. As a result, the image forming apparatus 100 transitions to a standby state. Otherwise (if energy saving button 136 is not operated), control returns to step 352.

  In step 356, the control unit 160 shifts the image forming apparatus 100 to the level 1 energy saving mode. Thereafter, control proceeds to step 322. Specifically, the control unit 160 controls the power supply unit 174 to limit or stop the power supply to a unit that is predetermined to achieve level 1 in addition to the power control in the preheating state. For example, among the plurality of control boards, processing such as stopping the power supply to the main board while maintaining the power supply to the sub-board and stopping the power supply to the sensor is executed. As a result, the power of the image forming apparatus 100 changes as shown by a graph 204 in FIG.

  After the image forming apparatus 100 is set to any one of the energy saving modes 1 to 3, in step 322, the control unit 160 determines whether or not the energy saving button 136 has been operated. When the energy saving button 136 is operated, as in the first embodiment (see FIG. 7), the image forming apparatus 100 transitions from the current energy saving mode to a standby state.

  Accordingly, as in the first embodiment, in the schedule of FIG. 2, level 1 is set in a time zone in which the use frequency of the image forming apparatus 100 is high, and in a time zone in which the use frequency of the image forming apparatus 100 is low. If level 3 is set and level 2 is set in a time zone having a frequency of use between them, image forming apparatus 100 may change to a power saving mode in a time zone with a high usage frequency. Therefore, when the energy saving button 136 is operated, the image forming apparatus 100 can return to the standby state in a relatively short time. Further, when the image forming apparatus 100 shifts to the energy saving mode in a time zone where the usage frequency is low, the image forming apparatus 100 shifts to the level 3 which is the deep energy saving mode, so that the power consumption is minimized. In addition, when the image forming apparatus 100 shifts to the energy saving mode in the normal usage frequency time zone, the image forming apparatus 100 shifts to the intermediate energy saving mode level 2, so that the power consumption is reduced and the energy saving button 136 is operated. The speed of returning to the standby state in the case can be realized in a well-balanced manner.

  If level 3 is set in a time zone in which the frequency of use of the image forming apparatus 100 is low, the time during which the preheating state is maintained is relatively short, and the image forming apparatus 100 can be quickly shifted to the energy saving mode. The power consumption due to the preheating state being maintained unnecessarily long can be suppressed. If level 1 is set in a time zone in which the image forming apparatus 100 is used frequently, the preheating state is maintained for a relatively long time, and the image forming apparatus 100 can be prevented from transitioning to the energy saving mode. . Therefore, the user can use the image forming apparatus 100 promptly, and it is possible to prevent the business from being hindered and the user from feeling stressed. If level 2 is set in a time zone in which the image forming apparatus 100 is used at a normal use frequency, the time during which the preheating state is maintained is intermediate between the case where the use frequency is low and the case where the use frequency is high. Efficiency and power saving can be realized in a well-balanced manner.

(Third embodiment)
In the first and second embodiments, after the image forming apparatus further transitions from the preheating state to the power saving state, the power saving state is maintained. On the other hand, in the third embodiment, the image forming apparatus can transition to a further power saving state as time elapses even after the transition from the preheating state to the further power saving state. The image forming apparatus according to the third embodiment is the same as the image forming apparatus according to the first embodiment, and the reference numerals in FIGS. 3 and 4 are cited.

  The energy saving function of the image forming apparatus 100 according to the present embodiment will be described. Here, it is assumed that the same schedule as in FIG. 2 is set in the image forming apparatus 100. Further, it is assumed that the auto power shut-off state includes a plurality of levels (specifically, levels 1 to 3), and each level is determined as shown in Table 4, for example. The energy saving period is a period from when the image forming apparatus 100 starts transition to the preheating state to when the level of the energy saving mode further changes.

  At this time, the image forming apparatus 100 controls the operation mode as shown in FIG. When the power is turned on, the image forming apparatus 100 supplies power to each unit, performs warm-up, and then enters a standby state at time T1. Thereafter, when a predetermined time (first time Δt1) elapses without the image forming apparatus 100 being operated (time T2), the image forming apparatus 100 transitions to a preheating state. When the period of the preheating state exceeds a predetermined time (second time Δt2) (time T3), the image forming apparatus 100 enters an auto power shut-off state. That is, the image forming apparatus 100 transitions to level 1 which is an energy saving mode with relatively high power consumption. At this time, the image forming apparatus 100 refers to the schedule and acquires the energy saving mode set in the current time zone. If the energy saving mode in the current time zone is set to level 1, the state of level 1 is maintained until the energy saving button 136 is operated as shown in the graph 220.

  If the current time zone is set to level 2 or level 3, the energy saving period becomes longer, and when the predetermined time (third time Δt3) is exceeded (time T4), the image forming apparatus 100 is as shown in the graph 222. In addition, the state transitions to level 2, which is an energy saving mode with medium power consumption. If the energy saving mode in the current time zone is set to level 2, the state of level 2 is maintained until the energy saving button 136 is operated as shown in the graph 224.

  If the current time zone is set to level 3, the energy saving period is further increased, and when the predetermined time (fourth time Δt4) is exceeded (time T5), the image forming apparatus 100 consumes as shown in the graph 226. Transition to level 3, which is an energy saving mode with relatively low power. Thereafter, the level 3 state is maintained until the energy saving button 136 is operated.

  With reference to FIG. 11, a control structure of a program for the image forming apparatus 100 to realize the above-described energy saving function will be described. This program is executed by the control unit 160 when the image forming apparatus 100 is powered on. The flowchart of FIG. 11 is obtained by replacing steps 340 and 342 with steps 370 and 372, replacing steps 348 and 350 with steps 374 and 376, and replacing step 356 with step 378 in the flowchart of FIG.

  In steps 300 to 310, when the first time Δt1 has elapsed, the control unit 160 causes the image forming apparatus 100 to transition to the preheating state, and determines whether the second time Δt2 has elapsed in the preheating state. In the preheating state, for example, the control unit 160 stops the power supply to the touch panel display 132 of the operation unit 130 and decreases the amount of power supplied to the heater of the fixing unit, thereby lowering the fixing temperature.

  When the second time has elapsed, in step 370, the control unit 160 shifts the image forming apparatus 100 to the level 1 energy saving mode. Specifically, the control unit 160 controls the power supply unit 174 to limit or stop the power supply to a unit that is predetermined to achieve level 1 in addition to the power control in the preheating state. For example, among the plurality of control boards, processing such as stopping the power supply to the main board while maintaining the power supply to the sub-board and stopping the power supply to the sensor is executed.

  In step 372, the control unit 160 acquires the current time from the timer 176, refers to the schedule at the acquired time, and determines whether or not the energy saving mode corresponding to the current time zone is level 1. If it is determined that the level is 1, the control proceeds to step 322. Thus, the level 1 state is maintained until the energy saving button 136 is operated as in the graph 220 of FIG. Otherwise, control passes to step 344.

  When the control shifts to step 344, steps 344 and 346 are repeated until a predetermined third time Δt3 elapses after the current time is stored in step 302 or until the energy saving button 136 is operated. When 3 hours Δt3 has elapsed, control proceeds to step 374.

  In step 374, the control unit 160 shifts the image forming apparatus 100 to the level 2 energy saving mode. Specifically, the control unit 160 controls the power supply unit 174 to limit or stop the power supply to a unit that is predetermined to achieve level 2 in addition to power control at level 1. For example, the power supply to the sub-board and the motor among the plurality of control boards is also stopped.

  In step 376, the control unit 160 acquires the current time from the timer 176, refers to the schedule at the acquired time, and determines whether or not the energy saving mode corresponding to the current time zone is level 2. If it is determined that it is level 2, the control proceeds to step 322. Thus, the level 2 state is maintained until the energy saving button 136 is operated as shown in the graph 224 of FIG. Otherwise, control passes to step 352.

  When the control shifts to step 352, steps 352 and 354 are repeated until a predetermined fourth time Δt4 elapses after the current time is stored in step 302 or until the energy saving button 136 is operated. When the fourth time Δt4 has elapsed, control proceeds to step 378.

  In step 378, the control unit 160 shifts the image forming apparatus 100 to the level 3 energy saving mode. Specifically, the control unit 160 controls the power supply unit 174 to limit or stop power supply to a unit that is set in advance to achieve level 3 in addition to power control at level 2. For example, power supply to the heater or the like of the fixing unit is stopped. Thereafter, in step 322, it is determined whether or not the energy saving button 136 has been operated.

  As described above, when the image forming apparatus 100 transitions to the level 1 to 3 energy saving mode, the control unit 160 determines whether or not the energy saving button 136 is operated in step 346, step 354, or step 322. Therefore, according to which level the energy saving button 136 is operated, the image forming apparatus 100 shifts from the current energy saving mode to the standby state as shown in FIG. 7 or FIG. When the energy saving button 136 is operated after the image forming apparatus has transitioned to the level set in the schedule, the transition to the standby state is made as shown in FIG. On the other hand, if the image forming apparatus has not transitioned to the level set in the schedule, it transitions to a standby state as shown in FIG. When the energy saving button 136 is operated in the level 1 state, the image forming apparatus 100 transitions to a standby state as shown in the graph 210. When the energy saving button 136 is operated in the level 2 state, the image forming apparatus 100 transitions to a standby state as indicated by a graph 212. When the energy saving button 136 is operated in the level 3 state, the image forming apparatus 100 transitions to a standby state as shown in the graph 214.

  Therefore, in the schedule of FIG. 2, level 1 is set in a time zone in which the usage frequency of the image forming apparatus 100 is high, and level 3 is set in a time zone in which the usage frequency of the image forming apparatus 100 is low. If level 2 is set in the usage frequency period, the image forming apparatus 100 can be promptly shifted to the shallow energy saving mode (level 1) if the usage frequency of the image forming apparatus 100 is high. When the energy saving button 136 is operated, it is possible to quickly return to the standby state. If the frequency of use of the image forming apparatus 100 is low, the period during which the image forming apparatus 100 is not operated is long, so that the image forming apparatus 100 can be shifted to a deeper energy saving mode (level 3). If the image forming apparatus 100 is used in a normal usage frequency, the preheating state is maintained between the case where the usage frequency is low and the case where the usage frequency is high. Well realized.

  In addition, even when the usage frequency is low, the image forming apparatus is not directly shifted to level 3, but is shifted to level 3 through level 1 and level 2, so that the return button in the level 1 or level 2 state. When is operated, it is possible to quickly return to the standby state. Therefore, even when the usage frequency is low, when it is used exceptionally for a short time, it is possible to avoid a reduction in work and stress on the user.

  In said 1st-3rd embodiment, although the case where the energy saving level (energy saving mode) was three steps of levels 1-3, it was not limited to this. The energy saving level may be two steps or four or more steps.

  In the first to third embodiments, the case where the image forming apparatus further transitions to any one of levels 1 to 3 after transitioning from the standby state to the preheating state has been described. There may be no state. Further, the preheating state may be set to level 1.

  In the first to third embodiments, the case where the timing of transition from the preheating state to the level 1 to 3 state is determined by measuring the elapsed time from the start of the transition to the preheating state is described. However, it is not limited to this. You may determine by measuring the elapsed time from the time of starting a standby state.

  In the third embodiment, after the transition from the preheating state to any one of the levels 1 to 3, the timing until the transition to another energy saving level is started from when the transition to the preheating state is started. Although the case where the elapsed time is measured and determined has been described, the present invention is not limited to this. You may determine by measuring the elapsed time from the time of starting a standby state. Moreover, you may measure and determine the elapsed time from the time of starting the transition to the state in any one of levels 1-3.

  In each energy saving level, the unit to which the power supply to the image forming apparatus is limited or stopped is not limited to the above example, and can be arbitrarily set according to the function and the internal configuration of the image forming apparatus. .

  In the first to third embodiments, the case where the first time Δt1 until the transition from the standby state to the preheating state is constant has been described. However, the first time Δt1 is a level set in the schedule. It may be different according to 1-3. In that case, for example, in step 302 of FIGS. 6, 9, and 11, the control unit 160 uses the first time Δt <b> 1 preset for each level set in the current time zone, What is necessary is just to determine whether 1 hour (DELTA) t1 passed.

  In said 1st-3rd embodiment, although the case where the schedule was preset was demonstrated, it is not limited to this. The schedule may be changed as appropriate. For example, the image forming apparatus may store the operated history, learn the usage status, and change the schedule.

  In the first to third embodiments, the image forming apparatus has been described. However, the present invention is not limited to this. The present invention can be applied to an electronic device having a power saving function.

  The present invention has been described above by describing the embodiment. However, the above-described embodiment is an exemplification, and the present invention is not limited to the above-described embodiment, and is implemented with various modifications. be able to.

DESCRIPTION OF SYMBOLS 100 Image forming apparatus 110 Image reading part 120 Image forming part 122 Memory 124 Printing part 130 Operation part 132 Touch panel display 134 Operation key part 136 Energy saving button 140 Paper feed part 150 Paper discharge processing part 160 Control part 166 Image processing part 174 Power supply part 176 timer 190 network

Claims (6)

An electronic device that transitions the operating state according to the energy saving level set for each time zone,
Storage means for storing a schedule including the energy saving level;
A determination unit that reads the schedule from the storage unit and determines the energy saving level corresponding to a current time zone;
Control means for controlling the power consumption state of the electronic device;
Including predetermined buttons,
The control means includes
In response to the elapse of a predetermined time while the electronic device is in a standby state, the electronic device is transitioned to a standby state,
Wherein when the electronic device has passed a predetermined time remains of the preliminary standby state, by the judging means, receiving said Ministry Enereberu corresponding to the current time zone is determined to be the first energy saving level, The electronic device is transitioned to the first energy saving level, and when the determination unit determines that the energy saving level corresponding to the current time zone is the second energy saving level, the electronic device is Transition to the second energy saving level, and
In response to the operation of the predetermined button, the electronic device is shifted to the standby state,
The power consumption of the electronic device decreases in the order of the standby state, the standby standby state, the first energy saving level, and the second energy saving level. An electronic device that transitions the operating state according to the energy saving level set for each time zone,
The electronic device is an image forming apparatus,
Storage means for storing a schedule including the energy saving level;
A determination unit that reads the schedule from the storage unit and determines the energy saving level corresponding to a current time zone;
Control means for controlling the power consumption state of the electronic device;
Including predetermined buttons,
The control means includes
In response to the elapse of a predetermined time while the electronic device is in a standby state, the electronic device is transitioned to a preheating state in which the heater temperature of the fixing unit used for image formation is reduced,
A predetermined first time elapses while the electronic device is in the preheated state, and the determination means determines that the energy saving level corresponding to the current time zone is the first energy saving level, Transitioning the electronic device to the first energy saving level;
A predetermined second time has passed while the electronic device remains in the preheated state, and the determination means determines that the energy saving level corresponding to the current time zone is the second energy saving level, Transitioning the electronic device to the second energy saving level; and
In response to the operation of the predetermined button, the electronic device is shifted to the standby state,
The power consumption of the electronic device is an electronic device that decreases in the order of the standby state, the preheating state, the first energy saving level, and the second energy saving level.   The electronic device according to claim 2, wherein the first time and the second time are equal.   The electronic device according to claim 2, wherein the second time is longer than the first time. An electronic device that transitions the operating state according to the energy saving level set for each time zone,
Storage means for storing a schedule including the energy saving level;
A determination unit that reads the schedule from the storage unit and determines the energy saving level corresponding to a current time zone;
Control means for controlling the power consumption state of the electronic device;
Including predetermined buttons,
The control means includes
In response to the elapse of a predetermined first time while the electronic device is in a standby state, the electronic device is transitioned to the first energy saving level,
A predetermined second time elapses while the electronic device maintains the first energy saving level, and the determination means determines that the energy saving level corresponding to the current time zone is the first energy saving level. In response, the electronic device is maintained at the first energy saving level,
The second time has elapsed while the electronic device maintains the first energy saving level, and the determination means determines that the energy saving level corresponding to the current time zone is not the first energy saving level. And the electronic device is transitioned to a second energy saving level, and
In response to the operation of the predetermined button, the electronic device is shifted to the standby state,
An electronic device in which power consumption of the electronic device decreases in the order of the standby state, the first energy saving level, and the second energy saving level. An electronic device that transitions the operating state according to the energy saving level set for each time zone,
The electronic device is an image forming apparatus,
Storage means for storing a schedule including the energy saving level;
A determination unit that reads the schedule from the storage unit and determines the energy saving level corresponding to a current time zone;
Control means for controlling the power consumption state of the electronic device;
Including predetermined buttons,
The control means includes
In response to the elapse of a predetermined time while the electronic device is in a standby state, the electronic device is transitioned to a preheating state in which the heater temperature of the fixing unit used for image formation is reduced,
In response to the elapse of a predetermined first time while the electronic device is in the preheated state, the electronic device is shifted to the first energy saving level,
A predetermined second time elapses while the electronic device maintains the first energy saving level, and the determination means determines that the energy saving level corresponding to the current time zone is the first energy saving level. In response, the electronic device is maintained at the first energy saving level,
The second time has elapsed while the electronic device maintains the first energy saving level, and the determination means determines that the energy saving level corresponding to the current time zone is not the first energy saving level. And the electronic device is transitioned to a second energy saving level, and
In response to the operation of the predetermined button, the electronic device is shifted to the standby state,
The power consumption of the electronic device is an electronic device that decreases in the order of the standby state, the preheating state, the first energy saving level, and the second energy saving level.

Images