JP7047053B2 - Image forming apparatus and control method of image forming apparatus - Google Patents

Description

The present invention relates to power mode switching control of an image processing apparatus using human body detection technology.

The conventional image processing device has a plurality of power modes, and a power saving mode in which the power supply in the device is turned off according to the power mode is supported. However, it takes time to return from the power saving mode to the normal power mode, which may reduce convenience.

In order to solve this problem, a motion sensor is used to return from the conventional power saving mode, and when it is determined that a person is approaching the device, the power saving mode is restored (see Patent Document 1). ..

Further, there is known an image processing device provided with a power saving key that is pressed by a user's operation (see Patent Document 2). When this power saving key is pressed by the user, the image processing device shifts to the power saving mode.

Japanese Unexamined Patent Publication No. 2012-58645 Japanese Patent Application Laid-Open No. 2002-229395

However, in the techniques described in Patent Document 1 and Patent Document 2, the image processing device may be instructed to shift to the power saving mode by pressing the power saving key while the motion sensor is detecting a person. be. In this case, the image processing device shifts to the power saving mode by pressing the power saving key, but the user in front of the image processing device (the user who pressed the power saving key) is detected by the motion sensor. Therefore, there is a problem that the image processing device returns to the normal power mode even though the power saving key is pressed, and power saving cannot be realized.

The present invention has been made to solve the above problems. An object of the present invention is to provide a mechanism for preventing an unnecessary recovery from a power saving state by detecting a motion sensor after the power saving key is pressed.

The present invention is an image forming apparatus having at least a first electric power state and a second electric power state that consumes less power than the first electric power state, wherein an image forming means for forming an image and the image forming apparatus are used. A reception means for accepting a user operation for shifting the power state from the first power state to the second power state, a first detection means for detecting a person in front of the image forming apparatus, and the image forming apparatus. The power state of the image forming apparatus is changed from the second power state to the first power state based on the detection of the person by the second detection means for detecting that the person has left the area and the first detection means. The transition means is provided with a transition means for shifting the power state of the image forming apparatus from the first power state to the second power state based on the user operation received by the reception means. After shifting to the second power state based on the user operation, the first power from the second power state of the power state of the image forming apparatus based on the detection of a person by the first detection means. When the transition to the state is prohibited and the second detection means detects that the person has left the image forming apparatus, the power state of the image forming apparatus based on the detection of the person by the first detecting means is described. It is characterized in that the prohibition of transition from the second power state to the first power state is lifted.

According to the present invention, it is possible to prevent unnecessary recovery from the power saving state by detecting the motion sensor after the power saving key is pressed.

The figure which illustrates the structure of the image processing apparatus which shows Example 1 of the electronic device of this invention. The figure which illustrates the detection range of the 1st motion sensor and the 2nd motion sensor. The figure which illustrates the hardware composition of the image processing apparatus of Example 1. FIG. The figure which illustrates the power supply form of the image processing apparatus of Example 1. FIG. The figure which illustrates the structure of the motion sensor return determination part of Example 1. FIG. The flowchart which illustrates the power mode transition operation of Example 1. The figure which illustrates the power supply form of the image processing apparatus of Example 2. FIG. The figure which illustrates the structure of the motion sensor return determination part of Example 2. FIG. The flowchart which illustrates the power mode transition operation of Example 2. The figure which illustrates the structure of the image processing apparatus of Example 3. FIG. The figure which illustrates the detection range of the motion sensor array. The figure which illustrates the reaction of the motion sensor array. The figure which illustrates the hardware composition of the image processing apparatus of Example 3. FIG. The figure which illustrates the power supply form of the image processing apparatus of Example 3. FIG. The figure which illustrates the structure of the motion sensor array determination part of Example 3. FIG. The flowchart which illustrates the power mode transition operation of Example 3.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing an example of the configuration of an image processing apparatus showing the first embodiment of the electronic device of the present invention. Note that FIG. 1A corresponds to a front view of the image processing apparatus, and FIG. 1B corresponds to a top view of the image processing apparatus.

Reference numeral 100 is an image processing device as an electronic device of the present invention. The image processing device 100 includes an operation unit 101, a scanner 102, an in-body finisher 103, a paper feed cassette 104, and the like, and has functions such as copying, printing, faxing, and scanning.

The image processing device 100 switches to one of a normal power mode, a second power saving mode in which the power consumption is smaller than the normal power mode, and a first power saving mode in which the power consumption is smaller than the second power saving mode. It can work. The power states of the image processing device 100 in the normal power mode, the first power saving mode, and the second power saving mode are referred to as a first power state, a second power state, and a third power state, respectively. The image processing device 100 is an image processing device capable of switching between at least the first power state and the second power state.

Further, the image processing device 100 has a first motion sensor 230 operating in the first power saving mode and a second motion sensor 231 operating in the second power saving mode. The first motion sensor 230 and the second motion sensor 231 use a sensor that detects an object at a distant place, such as a pyroelectric sensor or a reflection sensor.

The first motion sensor 230 is a first detection unit that detects a person approaching the image processing device 100 in a wide range, and is composed of, for example, a pyroelectric sensor, and can detect an object such as a human body. Is. Further, the second motion sensor 231 is a second detection unit that detects a person approaching the image processing device 100 in a narrower range than the first motion sensor 230, and is composed of, for example, a reflection sensor. , It is possible to detect objects such as the human body. FIG. 2 shows an example of the detection range of the first motion sensor 230 and the second motion sensor 231.

FIG. 2 is a diagram showing an example of the detection range of the first motion sensor 230 and the second motion sensor 231. Note that FIG. 2A corresponds to a front view of the image processing device 100, and FIG. 2B corresponds to a top view of the image processing device 100.
In FIGS. 2A and 2B, 111 indicates the detection range of the first motion sensor 230. 112 indicates the detection range of the second motion sensor 231.

FIG. 3A is a block diagram showing an example of the hardware configuration of the image processing apparatus 100 of the first embodiment.
The information processing device 226 is connected to the LAN 224 via the LAN I / F 217, and is connected to the telephone line 223 via the FAX 225.

The CPU 204 executes a software program that controls the entire information processing apparatus 226. The RAM 206 is used for temporarily storing data when the CPU 204 controls the device. The ROM 205 stores a program executed by the CPU 204, for example, a device startup program, various setting values, and the like. The storage 207 is a storage device such as an HDD or SSD, and is used for storing various data.

The operation unit I / F 209 controls the operation unit from the CPU 204. The operation unit 213 includes a hard key including an operation liquid crystal panel and a power saving key 214, and receives an instruction input from the user.

The scanner I / F 210 controls the scanner 215 from the CPU 204. The scanner 215 reads an image of a document installed on a platen or an ADF (Auto Document Feeder) and generates an image. The printer I / F211 controls the printer from the CPU 204. The printer 216 prints an image based on the image data on paper.

The FAX I / F 208 controls the FAX 225 from the CPU 204. The FAX 225 includes a modem 218, a CPU 219, a RAM 221 and a ROM 220, and a reception detection unit 222. The image processing device 100 controls data communication with an external device connected to the telephone line 223 via the FAX 225. Modem 218 performs modulation for transmission and reception of FAX 225. The CPU 219 controls transmission / reception of the FAX 225 in cooperation with the information processing apparatus 226 via the FAX I / F 208. The RAM 221 is used for temporary data storage when the CPU 219 controls the device. The ROM 220 stores a startup program of the FAX 225 device, various setting values, and the like. The functions of the CPU 219 of the FAX 225 and the RAM 221 and the ROM 220 may be provided in the information processing apparatus 226.

The LAN controller 212 controls the LAN I / F 217 from the CPU 204. The image processing device 100 controls data communication with an external device connected to the network 224 via the LAN I / F 217.

The power supply control unit 203 has a power control function that controls power supply from the power supply unit 202 to a required location. In the normal power mode, power is supplied to all the blocks as shown in FIG. 3 (A). At this time, it may take a form of supplying power only to the necessary functions, but it is not specified here.

In the first power saving mode, power is supplied to a part of the blocks as shown in FIG. 3 (B). In FIG. 3B, power is not supplied to the grayed out portion.

Hereinafter, the power supply state in the first power saving mode will be described.
First, power is supplied from the power supply 201 to the power supply unit 202. The blocks supplied with power from the power supply unit 202 are RAM 206, the first motion sensor 230, the motion sensor return determination unit 281, FAX I / F 208, reception detection unit 222, power saving key 214, operation unit IF 209, and LAN controller 212. , LAN I / F217. The RAM 206 supplies power as needed and does not have to supply all. Although it has been described that the power supply to the operation unit 213 is limited to the power saving key 214, the power supply may be supplied according to the transition condition to another power state such as the function of recognizing the user's touch.

Next, the conditions for shifting from the first power saving mode to the normal power mode will be described.
When the reception detection unit 222 detects a fax reception, the reception detection unit 222 transmits a transition command to the power supply control unit 203 via the FAX I / F 208 to shift to the normal power mode. When the LAN controller 212 receives a job such as a print job that requires a shift to the normal power mode from the LAN I / F217, the LAN controller 212 sends a shift command to the power supply control unit 203 to shift to the normal power mode. ..

When it is detected that the power saving key 214 is pressed by the user, a transition command is transmitted to the power supply control unit 203 via the operation unit I / F 209 to shift to the normal power mode. Although the operation unit 213 describes the case where power is supplied only to the power saving key 214, it may be configured to recognize the user's touch and transmit an interrupt to the power control unit 203. The conditions for shifting to the normal power mode described so far omit the detailed flow according to the present invention and the description in the second power saving mode, but the power control unit 203 receives the shift command in the middle of the flow. Needless to say, in some cases, the mode shifts to the normal power mode.

Next, the conditions for shifting from the first power saving mode to the second power saving mode will be described.
When the first motion sensor 230 detects that a person is approaching, the first motion sensor 230 transmits a transition command to the second power saving mode to the power supply control unit 203, and the second is Move to the second power saving mode. In the second power saving mode, power is supplied to some blocks as shown in FIG. 3 (C). In FIG. 3C, power is not supplied to the grayed out portion.

Next, the difference between the second power saving mode and the first power saving mode will be described.
In the second power saving mode, power is supplied to the second motion sensor 231. While the first motion sensor 230 detects a person, the second power saving mode is continued. If the first motion sensor 230 cannot detect a person, it transmits a transition command to the first power saving mode to the power supply control unit 203, and shifts to the first power saving mode. When the second motion sensor 231 detects the approach of a person, a transition command to the normal power mode is transmitted to the power supply control unit 203 via the motion sensor return determination unit 281 to shift to the normal power mode. do. Although the details will be described later, the motion sensor return determination unit 281 limits the signal from the second motion sensor 231 to the power supply control unit 203 (the above-mentioned instruction to shift to the normal power mode) under predetermined conditions. do.

Hereinafter, the power mode transition using the motion sensor will be described in detail with reference to FIG.
FIG. 4 is a diagram showing an example of a power supply mode of the image processing device 100 of the first embodiment.
The power supply input from the power supply 201 is connected to the switches (hereinafter SW) 310 and SW312. The SW 310 includes a power supply control unit 203, a seesaw switch or a button switch that can be manually turned on by the user, and the like.

When the SW 310 is turned on, the power supply control unit 203 may automatically send an on command 512 to the SW 311 and an on command 513 to the SW 312 to shift to the normal power mode. The first power supply unit 300, which is supplied with power when the SW 310 is turned on, supplies power to the block operating in the first power saving mode. Although the FAX I / F 208 and the operation unit I / F 209 are omitted in FIG. 4, they are also supplied with power from the first power supply unit 300.

When SW311 is turned on, the second power supply unit 301 is supplied with power using the first power supply unit 300. The second power supply unit 301 supplies power to the block operating in the second power saving mode. The condition for shifting from the first power saving mode to the second power saving mode is when the first motion sensor 230 detects a person. In addition, SW311 and SW312 can be realized by FET, a relay switch and the like.

When the first motion sensor 230 detects a person, it transmits a request signal 511 for turning on SW311 to the power supply control unit 203. Upon receiving the request signal 511, the power supply control unit 203 transmits an on command 512 to the SW311 to supply power to the second power supply unit 301.

Next, the conditions for shifting to the normal power mode will be described. When the power supply control unit 203 receives at least one request signal that needs to shift to the normal power mode, the power control unit 203 shifts to the normal power mode. Hereinafter, each request signal for the above normal mode will be described.

When the LAN controller 212 receives a command such as a print job that needs to shift to the normal power mode, the LAN controller 212 transmits a request command 501 to the power supply control unit 203. Further, the reception detection unit 222 transmits a request command 502 to the power supply control unit 203 when the reception of the fax is detected. Further, when the power saving key 214 is pressed by the user, the power saving key 214 transmits a request command 503 to the power supply control unit 203. When the power saving key 214 is pressed, the power saving key 214 outputs a signal 530 for invalidation flag processing to the motion sensor return determination unit 281.

When the power supply control unit 203 receives any of the above transition request signals, the power supply control unit 203 transmits an on command 513 to the SW 312, and the third power supply unit 302 is supplied with power. The third power supply unit 302 supplies power to the block used in the normal power mode. Although the scanner I / F210 and the printer I / F211 are omitted in FIG. 4, they are also supplied with power from the third power supply unit 302. The power supplied from the power supply 201 is divided into three types, that is, a first power supply unit 300, a second power supply unit 301, and a third power supply unit 302.

Next, the output of the transition request signal 504 based on the second motion sensor 231 will be described. When the second motion sensor 231 detects a person, the second motion sensor 231 transmits a detection signal 531 to the motion sensor return determination unit 281. The motion sensor return determination unit 281 determines whether or not the person instructed to shift to the power saving mode by using the power saving key 214 has left the image processing device 100, and from the power saving mode by the second motion sensor 231. Restricts the return of.

In this embodiment, when the power saving key 214 is instructed to shift to the power saving mode and the motion sensor (for example, the first motion sensor 230) continues to detect a person, the motion sensor returns. The determination unit 281 limits the output of the transition request signal 504. Further, when the human sensor is not detected after the transition to the power saving mode by the power saving key 214 other than the power saving key 214, or when the motion sensor is not detected after the transition to the power saving mode by the power saving key 214, the motion sensor return determination unit 281 of the transition request signal 504. Remove the output restriction. Whether or not the motion sensor detects a person is determined by transmission from the power supply control unit 203, but a signal is transmitted from the motion sensor to the motion sensor return determination unit 281 to determine. You may.

Further, the motion sensor is the first motion sensor 230, but in the determination of the motion sensor return determination unit 281, a person who has instructed the transition to the power saving mode from the image processing device 100 using the power saving key 214. It suffices if it can be determined that is separated. Therefore, in the determination of the motion sensor return determination unit 281, the detection state of either or both of the first motion sensor 230 and the second motion sensor 231 may be used as the determination criterion. Hereinafter, when the first motion sensor 230 continues to detect, the motion sensor return determination unit 281 will limit the transition request signal 504.

Hereinafter, the details of the output limitation of the transition request signal 504 by the motion sensor return determination unit 281 will be described with reference to FIG.
FIG. 5 is a diagram showing an example of the configuration of the motion sensor return determination unit 281 of the first embodiment.
When the power saving key 214 is pressed, a signal 530 is output from the power saving key 214 to the invalid flag 600. The signal 530 is used to limit the output of the transition request signal 504 to the normal power mode based on the second motion sensor 231. When the power saving key 214 is pressed, a power saving mode transition instruction (not shown) is output from the power saving key 214, and when the power supply control unit 203 receives this, the power saving mode shifts to the power saving mode.

When shifting to the power saving mode by the power saving mode transition instruction from the power saving key 214, the power supply control unit 203 limits the transition request signal 504 while the first motion sensor 230 detects a person. , Continues to output the signal 532 to the invalid flag 600. The signal 532 may be a detection signal of the first motion sensor 230.

By default, the invalid flag 600 sets the signal (hereinafter, motion sensor invalid flag) 599 to "1". Then, when the signal 530 is received from the power saving key 214, the invalid flag 600 keeps the motion sensor invalid flag 599 at "0" until the signal 532 is no longer received. Further, when the reception of the signal 532 is stopped, the invalid flag 600 returns the motion sensor invalid flag 599 to "1". Then, the motion sensor invalid flag 599 is kept at "1" until the signal 530 is received again. When the logic 601 receives the signal 531 from the second motion sensor 231 with the motion sensor invalid flag 599 set to "1", the logic 601 receives a transition request signal 504 to the normal power mode based on the second motion sensor 231. Is output to the power supply control unit 203.

FIG. 6 is a flowchart showing an example of the power mode transition operation in the image processing apparatus of the first embodiment.
In the image processing apparatus 100, when the power saving key 214 is pressed (Yes in S11), the signal 530 is output from the power saving key 214 to the invalid flag 600, and the invalid flag 600 sets the motion sensor invalid flag 599 to “0”. (S12). When the motion sensor invalid flag 599 is "0", the transition request signal 504 from the motion sensor return determination unit 281 to the normal power mode is restricted. Further, when the power saving key 214 is pressed, the power supply control unit 203 performs a transition process to the power saving mode (S14). The power saving mode to be shifted may be the first power saving mode or the second power saving mode.

Further, even when the power saving mode transition condition other than the power saving key 214 is satisfied (when Yes in S13) instead of pressing the power saving key 214 (No in S11), the power supply control unit 203 shifts to the power saving mode. (S14). In this case, the motion sensor invalid flag 599 is "1". When the motion sensor invalid flag 599 is "1", the motion sensor return determination unit 281 does not limit the transition request signal 504 to the normal power mode. The power saving mode transition condition other than the power saving key 214 is, for example, that the image processing device 100 has not been used for a certain period of time.

After shifting to the power saving mode, the power supply control unit 203 determines whether or not the first motion sensor 230 has detected a person (S40). Then, when it is determined that the first motion sensor 230 is detecting a person (Yes in S40), the process proceeds to S41, and when it is not detected, the process proceeds to S42.

In S41, if the power mode at that time is the first power saving mode, the power control unit 203 shifts to the second power saving mode and supplies power to the second motion sensor 231 while supplying power to the second motion sensor 231 at that time. If the power mode is the second power saving mode, the power state is continued.

In S42, if the power mode at that time is the second power saving mode, the power control unit 203 shifts to the first power saving mode, stops the power supply to the second motion sensor 231 and, on the other hand, If the power mode at that time is the first power saving mode, the power state is continued.

When the motion sensor invalid flag 599 is "1" (No in S15), the motion sensor return determination unit 281 sends a transition request signal 504 in response to the detection signal 531 from the second motion sensor 231. , Can be output to the power supply control unit 203.

When the motion sensor invalid flag 599 is "0" (Yes in S15), the invalid flag 600 changes the motion sensor invalid flag 599 according to the signal 532 from the power supply control unit 203 based on the detection state of the motion sensor. Control. Since the motion sensor described in S15 is used to determine whether or not the user who has pressed the power saving key 214 has left the image processing device 100, the motion sensor 230 may be the first motion sensor or the second person. The motion sensor 231 may be used. Alternatively, it may be used for determining both the first motion sensor 230 and the second motion sensor 231.

When the motion sensor is in the detection state (No in S16), the output of the signal 532 is maintained from the power supply control unit 203, whereby the invalid flag 600 maintains the motion sensor invalid flag 599 to "0". .. When the motion sensor invalid flag 599 is "0", the motion sensor return determination unit 281 transmits the transition request signal 504 to the power supply control unit 203 even if the detection signal 531 is input from the second motion sensor 231. do not do.

On the other hand, when the motion sensor is not detected (Yes in S16), the output of the signal 532 from the power supply control unit 203 is stopped, so that the invalid flag 600 sets the motion sensor invalid flag 599 to "1". (S17).

When the motion sensor invalid flag 599 is "1" (No in S15), the invalid flag 600 is a signal 532 from the power supply control unit 203 based on the detection state of the motion sensor (here, the first motion sensor 230). Regardless of, the motion sensor invalid flag 599 is maintained at "1". When the motion sensor invalid flag 599 is "1", the motion sensor return determination unit 281 transmits a transition request signal 504 to the power supply control unit 203 when the detection signal 531 is input from the second motion sensor 231. do.

When the request signal 511, 501, 502, 503 or 504 is not received, the power supply control unit 203 determines that the normal power mode transition condition is not satisfied (No in S18), and again by the first motion sensor 230. The detection is determined (S40).

On the other hand, when the request signal 511, 501, 502, 503 or 504 is received, the power supply control unit 203 determines that the normal power mode transition condition is satisfied (Yes in S18), and shifts to the normal power mode (S19). ).

When the motion sensor invalid flag 599 is "0", the motion sensor return determination unit 281 does not output the transition request signal 504 to the normal power mode, so that the second motion sensor 231 detects a person. However, it does not meet the normal power mode transition conditions. On the other hand, when the motion sensor invalid flag 599 is "1", the output of the transition request signal 504 to the normal power mode is not limited. Therefore, when the second motion sensor 231 detects a person, the normal power mode is used. The transition conditions are met.

As described above, when the power saving key 214 is pressed to shift to the power saving mode, the power saving mode by the motion sensor is changed to the normal power mode until the user who presses the power saving key 214 leaves the image processing device 100. You can limit the transition to. Therefore, it is possible to prevent unnecessary recovery from the power saving state due to the detection of the motion sensor after the power saving key is pressed. As a result, it is possible to reduce unnecessary power consumption and extend the life of equipment parts having a long life while improving user convenience.

In the above description, the motion sensor return determination unit 281 limits the output of the transition request signal 504 and limits the return to the normal power mode by the detection of the second motion sensor 231. However, the motion sensor return determination unit 281 may not be provided, and the power supply control unit 203 may directly limit the return to the normal power mode by the detection of the second motion sensor 231. In this case, the detection signal 531 of the second motion sensor 231 is directly input to the power supply control unit 203. Then, when the power saving key 214 is pressed and the motion sensor (for example, the first motion sensor 230) is detected, the power supply control unit 203 may input the detection signal 531 to the power supply control unit 203. It is configured to be ignored by the power supply control unit 203. Hereinafter, it will be described with reference to the flowchart of FIG. In this case, each process shown in FIG. 6 is realized by the power supply control unit 203 reading and executing a program stored in a storage device (not shown) in the power supply control unit 203.

In S11, the power supply control unit 203 determines whether or not the power saving key 214 has been pressed. Then, when it is determined that the power saving key 214 is pressed (Yes in S11), the power supply control unit 203 shifts to S12. In S12, the power supply control unit 203 sets the motion sensor invalid flag to “0” and shifts to S14. This flag is stored in a storage unit (not shown) in the power supply control unit 203, and is set to "1" by default.

On the other hand, when it is determined in S11 that the power saving key 214 is not pressed (No in S11), the power supply control unit 203 shifts to S13. In S13, the power supply control unit 203 determines whether or not the condition for shifting to the power saving mode is satisfied. The CPU 204 determines the transition condition to the power saving mode itself, and when the CPU 204 receives an instruction to shift to the power saving mode, the power supply control unit 203 determines that the transition condition to the power saving mode is satisfied.

If it is determined in S13 that the condition for shifting to the power saving mode is not satisfied (No in S13), the power supply control unit 203 shifts to S11. On the other hand, when it is determined that the condition for shifting to the power saving mode is satisfied (Yes in S13), the power supply control unit 203 shifts to S14.

In S14, the power supply control unit 203 performs a process of shifting the power mode to the power saving mode, and shifts to S40. This power saving mode may be the first power saving mode or the second power saving mode.

In S40, the power supply control unit 203 determines whether or not the first motion sensor 230 has detected a person. If the first motion sensor 230 detects a person, it shifts to S41, and if it does not detect it, it shifts to S42.

In S41, if the power mode at that time is the first power saving mode, the power control unit 203 shifts to the second power saving mode and supplies power to the second motion sensor 231 while the second one. In the power saving mode of, the power state is continued and the process shifts to S15.

In S42, if the power mode at that time is the second power saving mode, the power control unit 203 shifts to the first power saving mode, stops the power supply to the second motion sensor 231 and, on the other hand, If it is the first power saving mode, the power state is continued and the process shifts to S15.

In S15, the power supply control unit 203 determines whether or not the motion sensor invalid flag is “0”. Then, when the motion sensor invalid flag is determined to be "0" (Yes in S15), the process proceeds to S16, and when the motion sensor invalid flag is determined to be "1" (No in S15), S18 Move to.

In S16, the power supply control unit 203 determines whether or not the motion sensor (for example, the first motion sensor 230) is not detected. Then, when the motion sensor determines that the person is not detected (Yes in S16), the power supply control unit 203 determines that the user who has pressed the power saving key has left, and sets the motion sensor invalid flag to "1". (S17), shift to S40. On the other hand, in S16, when it is determined that the human sensor has detected a person (No in S16), the power supply control unit 203 shifts to S18.

In S18, the power supply control unit 203 determines whether or not the normal power mode transition condition is satisfied. When the motion sensor invalid flag is "1", the power supply control unit 203 determines that the normal power mode transition condition is satisfied when the signal 531, 511, 501, 502, or 503 is received. On the other hand, when the motion sensor invalid flag is "0", the power supply control unit 203 determines that the normal power mode transition condition is satisfied when the signal 511, 501, 502, or 503 is received. However, in this case, the power supply control unit 203 determines that the normal power mode transition condition is not satisfied when the signal 531 is received. That is, when the motion sensor invalid flag is "1", the transition to the normal power mode based on the detection by the second motion sensor 231 is restricted.

Then, when the power supply control unit 203 determines that the normal power mode transition condition is not satisfied (No in S18), the power supply control unit 203 shifts to S40. On the other hand, when it is determined that the normal power mode transition condition is satisfied (Yes in S18), the power supply control unit 203 shifts to the normal power mode (S19).

Further, when the power saving key 214 gives an instruction to shift to the power saving mode and the first motion sensor 230 continues to detect a person, the power supply of the second motion sensor 231 is stopped and the second motion sensor 230 is stopped. The return to the normal power mode by the detection of the motion sensor 231 may be restricted.

About Example 2, the outline of the difference from Example 1 will be described. In the first embodiment, the image processing device 100 detects that the user who has pressed the power saving key 214 has left, and limits the transition to the unnecessary normal power mode. In the second embodiment, if there is no job after shifting to the normal power mode, it is determined that the device has returned from the normal power mode due to a false positive, and the user who presses the power saving key 214 leaves the image processing device 100. It limits the transition to power mode.

Hereinafter, the difference from the first embodiment will be described.
The difference from FIG. 4 will be described with reference to FIG. 7 regarding the power mode transition using the sensor.
FIG. 7 is a diagram showing an example of a power supply mode of the image processing device 100 of the second embodiment.
In the second embodiment, when the job is performed after shifting to the normal power mode, the signal 533 is transmitted from the CPU 204 to the motion sensor return determination unit 281. The signal 533 is used to enable the output of the transition request signal 504 based on the human detection of the second motion sensor 231.

FIG. 8 is a diagram showing an example of the configuration of the motion sensor return determination unit 281 of the second embodiment.
When there is no job after shifting to the normal power mode and the power saving key 214 is pressed, the signal 533 is output from the CPU 204 to the invalid flag 600. When the invalid flag 600 receives the signal 533, the invalid flag 600 changes the job flag stored in the storage unit (not shown) in the invalid flag 600 to “1”. The job flag is "0" by default. When the job flag is "0", the invalid flag 600 keeps the motion sensor invalid flag 599 "0" when the signal 530 is received from the power saving key 214 until the signal 532 is no longer received. On the other hand, when the job flag is "1", the invalid flag 600 keeps the motion sensor invalid flag 599 at "1" even if the signal 530 is received from the power saving key 214. Other configurations are the same as in FIG. 5, and are omitted.

FIG. 9 is a flowchart showing an example of the power mode transition operation in the image processing apparatus of the second embodiment.
When a job such as copying or scanning is performed after the transition to the normal power mode (S20) (Yes in S21), the CPU 204 outputs a signal 533 to the invalid flag 600. Upon receiving the signal 533, the invalid flag 600 sets the job flag to "1". On the other hand, if a job such as copying or scanning has not been performed after the transition to the normal power mode (S20) (No in S21), the CPU 204 does not output the signal 533. The invalid flag 600 keeps the job flag at "0" when the signal 533 is not received.

When the power saving key 214 is pressed (Yes in S11), the signal 530 is output from the power saving key 214 to the invalid flag 600. When the invalid flag 600 receives the signal 530 and determines that the job flag is "0" (Yes in S24), the motion sensor invalid flag 599 is set to "0" (S12).

On the other hand, the invalid flag 600 keeps the motion sensor invalid flag 599 at "1" when the job flag is determined to be "1" (when No in S24) even if the signal 530 is received. Since the subsequent operations are the same as those in FIG. 6, the description thereof will be omitted.

As described above, by including whether or not there was a job after the transition to the normal power mode as a criterion, it is possible to determine whether or not the transition to the normal power mode is due to a false positive and control the transition to the power mode. It is possible to limit the transition to unnecessary normal power mode. Therefore, it is possible to prevent unnecessary recovery from the power saving state due to the detection of the motion sensor after the power saving key is pressed. As a result, it is possible to reduce unnecessary power consumption and extend the life of equipment parts having a long life.

In the above description, the motion sensor return determination unit 281 limits the output of the transition request signal 504 and limits the return to the normal power mode by the detection of the second motion sensor 231. However, the motion sensor return determination unit 281 may not be provided, and the power supply control unit 203 may directly limit the return to the normal power mode by the detection of the second motion sensor 231.
Also in this case, only the differences from the first embodiment will be described. In this case, the signal 533 from the CPU 204 is directly input to the power supply control unit 203, and the job flag is stored in the power supply control unit 203. Then, when the power saving key 214 is pressed and the job flag is determined to be "0", the power supply control unit 203 is configured so that even if the detection signal 531 is input to the power supply control unit 203, the power supply control unit 203 ignores it. do. Hereinafter, it will be described with reference to the flowchart of FIG. In this case, each process shown in FIG. 9 is realized by the power supply control unit 203 reading and executing a program stored in a storage device (not shown) in the power supply control unit 203.

When the power control unit 203 receives the signal 533 from the CPU 204, it determines that a job such as copying or scanning has been performed after the normal power mode transition (S20) (Yes in S21), and sets the job flag to "1" (Yes). S22), shift to S11. On the other hand, when the signal 533 is not received from the CPU 204 after the normal power mode transition (S20), the power supply control unit 203 determines that a job such as copying or scanning has not been performed after the normal power mode transition (S20). (No in S21). In this case, the power supply control unit 203 keeps the job flag at "0" (S23) and shifts to S11.

In S11, when the power supply control unit 203 determines that the power saving key 214 is pressed (Yes in S11), the power supply control unit 203 shifts to S24. In S24, the power supply control unit 203 determines whether or not the job flag is “0”. Then, when the job flag is determined to be "0" (Yes in S24), the power supply control unit 203 sets the motion sensor invalid flag to "0" and shifts to S14. On the other hand, when it is determined that the job flag is not "0" (No in S24), the power supply control unit 203 keeps the motion sensor invalid flag "1" and shifts to S14. Since the subsequent operations are the same as those in the first embodiment, the description thereof will be omitted.

The outline of the difference between Example 3 of the present invention and Example 1 will be described. In the first embodiment, two motion sensors are used to limit the unnecessary shift to the normal power mode when the shift to the power mode is performed. In the third embodiment, by using a motion sensor array in which infrared sensors are arranged in a matrix as the motion sensor, the transition to the normal power mode, which is unnecessary for one motion sensor, is restricted. Hereinafter, the difference from the first embodiment will be described.

FIG. 10 is a diagram showing an example of the configuration of the image processing apparatus of the third embodiment. Note that FIG. 10A corresponds to a front view of the image processing apparatus, and FIG. 10B corresponds to a top view of the image processing apparatus.
As shown in FIG. 10, the image processing device of the third embodiment has a motion sensor array 280.

FIG. 11 is a diagram showing an example of the detection range 115 of the motion sensor array 280.
The motion sensor array 280 is used as a trigger for the transition from the power saving mode to the normal power mode. In the motion sensor array 280, infrared sensors are arranged in a matrix, and the sensor detection range is divided into a plurality of regions, and an object such as a human body can be detected in each region. The motion sensor array 280 can detect that a person is approaching and can detect not only whether or not the person is inside the area but also the details of the movement of the person.

The motion sensor array determination unit 282 can acquire the position of the region where a person is detected by the motion sensor array 280 from the motion sensor array 280 as region position information. In the motion sensor array 280, infrared sensors such as pyroelectric sensors and reflection sensors are arranged in an N × M array (in this embodiment, for example, pyroelectric sensors are arranged in 8 × 8). It will be explained using the thing, but it is not limited to this). Further, the electrocardiographic sensor is a passive type motion sensor, which detects the human body by detecting a temperature change due to infrared rays naturally radiated from a substance having a temperature (heat source) such as the human body. The sensor array constituting the motion sensor array 280 is not limited to the pyroelectric sensor array, and may be another type of motion sensor array. As the motion sensor array 280, any sensor array may be used as long as a plurality of pyroelectric sensors, reflection sensors, and the like can be arranged and grasped in detail.

Hereinafter, a pyroelectric array sensor will be described as a motion sensor array 280 that detects the movement of a person based on a heat source.
FIG. 12 is a diagram showing an example of the reaction of the motion sensor array 280.
FIG. 12A shows the reaction of the motion sensor array 280 when no one is nearby. Since the motion sensor array 280 does not detect the human heat source, all the sensors are not responding.

FIG. 12B shows an example of a condition that triggers the transition to the normal power mode. When it is detected that a heat source is generated in the center of the detection area of the motion sensor array 280, it is determined that a person is approaching to use the image processing device 100, and the mode is shifted to the normal power mode. In addition, in order to prevent malfunction, the normal power mode may be entered when the reaction in this area continues for a certain period of time. Further, the sensor information of the motion sensor array 280 may be sucked up at regular intervals, and when the reaction occurs a plurality of times (twice or more) in succession, the mode may be shifted to the normal power mode. Here, it will be described as shifting to the normal power mode when the heat source reacts in the range shown in FIG. 12 (B). Note that FIGS. 12 (C) and 12 (D) will be described later.

FIG. 13 is a block diagram showing an example of the hardware configuration of the image processing apparatus 100 of the third embodiment. Hereinafter, the difference from the first embodiment shown in FIG. 3 will be described.
In the first embodiment shown in FIG. 3, there are two motion sensors, a first motion sensor 230 and a second motion sensor 231. Further, for the purpose of reducing unnecessary power, the power mode for supplying power to each motion sensor is switched between the first power saving mode and the second power saving mode. On the other hand, in the third embodiment, the motion sensor array 280 is used to set one power saving mode. The motion sensor array 280 is used to shift from the power saving mode to the normal power mode when the motion sensor array determination unit 282 determines that a predetermined condition (FIG. 12B) is satisfied.

Note that FIG. 13A shows a block fed in the normal power mode, and FIG. 13B shows a block fed in the power saving mode. Power is not supplied to the portion grayed out in FIG. 13B in the power saving mode.

Hereinafter, the difference from the first embodiment shown in FIG. 4 will be described with reference to FIG. 14 regarding the power mode transition using the sensor.
FIG. 14 is a diagram showing an example of a power supply mode of the image processing device of the third embodiment.
In the third embodiment, the motion sensor array determination unit 282 determines whether or not to output a transition request signal to the normal power mode. The motion sensor array determination unit 282 determines whether or not the condition as shown in FIG. 12B is satisfied. Further, the motion sensor array 280 outputs the signal 531 and the signal 534 to the motion sensor array determination unit 282. The signal 531 and the signal 534 are signals that can specify the position of the region where the heat source is detected by the motion sensor array 280, and are used by the motion sensor array determination unit 282 to determine the transition request signal output.

In the example of FIG. 15, the motion sensor array 280 is configured to output a signal 531 when the first heat source is detected and output a signal 534 when the second heat source is detected. However, when the motion sensor array 280 detects a heat source, only the signal 531 is output to the motion sensor array determination unit 282, and the motion sensor array determination unit 282 is the second from the detection position of the heat source indicated by the signal 531. It may be configured to determine the detection of the second heat source.

Hereinafter, the details of the output limitation of the transition request signal 504 by the motion sensor array determination unit 282 will be described with reference to FIG.
FIG. 15 is a diagram showing an example of the configuration of the motion sensor array determination unit 282 of the third embodiment.
By using the motion sensor array 280, the movement of the user can be detected in detail. It is also possible to determine that there are a plurality of heat sources as shown in FIG. 12 (C).
When the motion sensor array 280 detects the heat source 1 which is the first heat source, the signal 531 is output to the condition determination circuit 603, and when the heat source 2 which is the second heat source is detected, the condition is determined. The signal 534 is output to the circuit 603.

The condition determination circuit 603 determines whether or not to output the transition request signal based on the conditions shown in FIG. 12B from the state of the signal 531 and outputs the signal 536 to the logic 601. Further, the condition determination circuit 603 determines whether or not to output the transition request signal from the state of the signal 534 based on the conditions as shown in FIG. 12B, and outputs the signal 537 to the logic 602.

While the motion sensor array 280 detects the user who has pressed the power saving key 214 as shown in FIG. 12D, the motion sensor invalid flag 599 is set to “0” by the invalid flag 600, and the output limit of the signal 536 is limited. It is done and the transition to normal power mode is restricted. Further, as shown in FIG. 12C, the transition to the normal power mode is effective for the different user heat source 2 while the user heat source 1 for which the power saving key 214 is pressed is restricted from shifting to the normal power mode. It is also possible to.

When the power saving key 214 is pressed, a signal 530 is transmitted from the power saving key 214 to the invalid flag 600, and the transition request signal 536 from the motion sensor array 280 is invalidated. Then, when the motion sensor array 280 is not detected, the signal 535 is output from the motion sensor array 280 to the invalid flag 600, and the request signal 536 from the motion sensor array 280 is enabled. If a heat source different from the heat source is generated while the user heat source for which the power saving key 214 is pressed is detected, a signal 534 is output from the motion sensor array 280 to the condition determination circuit 603. Then, when the detection state by the signal 534 satisfies the transition condition, the condition determination circuit 603 outputs the request signal 537 to the logic 602 and outputs the transition request signal 504 to the normal power mode.

FIG. 16 is a flowchart showing an example of the power mode transition operation in the image processing apparatus of the third embodiment.
First, since the processes of S11 to S14 are the same as those of FIG. 6, the description thereof will be omitted.
When the motion sensor invalid flag 599 is "0" (Yes in S15), the invalid flag 600 changes and controls the motion sensor invalid flag 599 according to the detection signal 535 from the motion sensor array 280.

When the motion sensor array 280 is in the detection state (No in S16), the output of the signal 535 from the motion sensor array 280 is maintained, whereby the invalid flag 600 sets the motion sensor invalid flag 599 to “0”. To maintain. When the motion sensor invalid flag 599 is "0", the motion sensor array determination unit 282 assumes that the detection signal 531 is input from the motion sensor array 280 and satisfies a predetermined condition (for example, FIG. 12B). Also, the transition request signal 504 is not transmitted to the power supply control unit 203. The condition determination circuit 603 performs the determination of the condition as shown in FIG. 12B.

However, even if the motion sensor invalid flag 599 is "0", if the motion sensor array determination unit 282 detects another person with the motion sensor array 280 (Yes in S30), the transition request signal 504 To send. In addition, the case where another person described in S30 is detected is shown in FIG.
As shown in (C), the motion sensor array 280 detects a heat source 2 (new object) different from the heat source 1, and corresponds to the case where the conditions as shown in FIG. 12 (B) are satisfied.

Further, when the motion sensor array 280 is not detected (Yes in S16), the output of the signal 535 is stopped from the motion sensor array 280, whereby the invalid flag 600 is changed to the motion sensor invalid flag 599. Is changed to "1" (S17).

When the motion sensor invalid flag 599 is "1" (No in S15), the invalid flag 600 maintains the motion sensor invalid flag 599 at "1" regardless of the detection signal 535 from the motion sensor array 280. When the motion sensor invalid flag 599 is "1", the motion sensor return determination unit 281 receives a detection signal 531 from the motion sensor array 280 and satisfies a predetermined condition (for example, FIG. 12B). The transition request signal 504 is transmitted to the power supply control unit 203. The condition determination circuit 603 performs the determination of the condition as shown in FIG. 12B.

In the third embodiment, when the motion sensor invalid flag 599 is "0", the transition request signal 504 is not output from the motion sensor array determination unit 282 only when one heat source is detected by the motion sensor array 280. Therefore, even when the second motion sensor 231 detects a person who presses the power saving key 214, the normal power mode transition condition is not satisfied. However, even when the motion sensor invalid flag 599 is "0", if two or more heat sources are detected by the motion sensor array 280, the transition request signal 504 is transmitted from the motion sensor array determination unit 282. Is output. Therefore, when the second motion sensor 231 detects a person other than the person who pressed the power saving key 214 under the conditions as shown in FIG. 12B, the normal power mode transition condition is satisfied. Of course, when the motion sensor invalid flag 599 is "1", the output of the transition request signal 504 is not limited, so that the second motion sensor 231 detects a person under the conditions as shown in FIG. 12 (B). In that case, the normal power mode transition condition is satisfied.

As described above, by using the motion sensor array 280, the transition to the normal power mode is restricted for the user who presses the power saving key 214, and the transition to the normal power mode is performed for different users. be able to. Therefore, it is possible to prevent unnecessary recovery from the power saving state due to the detection of the motion sensor after the power saving key is pressed. As a result, the convenience of the user can be further improved. As described above, the same effect as when two motion sensors are used by using the motion sensor array 280 can be obtained. In the third embodiment, it is not necessary to switch between the first power saving mode and the second power saving mode.

In the above description, the motion sensor array determination unit 282 limits the output of the transition request signal 504 and limits the return to the normal power mode by the detection of the motion sensor array 280. However, the motion sensor array determination unit 282 may not be provided, and the power supply control unit 203 may directly limit the return to the normal power mode by the detection of the motion sensor array 280. Also in this case, only the differences from the first embodiment will be described. In this case, the signals 531 and 534 from the motion sensor array 280 are directly input to the power supply control unit 203, and the motion sensor invalid flag is stored in the power supply control unit 203. Then, when the power saving key 214 is pressed and the motion sensor flag is determined to be "0", the power supply control unit 203 ignores the detection signal 531 even if it is input to the power supply control unit 203. On the other hand, when the detection signal 534 is input to the power supply control unit 203, even if the motion sensor flag is "0", the power supply control unit 203 is not ignored and the condition as shown in FIG. 12B is satisfied. , Configure to return to normal mode. Hereinafter, it will be described with reference to the flowchart of FIG. In this case, each process shown in FIG. 16 is realized by the power supply control unit 203 reading and executing a program stored in a storage device (not shown) in the power supply control unit 203.

In S15, the power supply control unit 203 determines whether or not the motion sensor invalid flag is “0”.
Then, when the motion sensor invalid flag is determined to be "0" (Yes in S15), the process proceeds to S16, and when the motion sensor invalid flag is determined to be "1" (No in S15), S18 Move to.

In S16, the power supply control unit 203 determines whether or not the motion sensor array 280 is not detected. Then, when the motion sensor array 280 determines that the person is not detected (Yes in S16), the power supply control unit 203 determines that the user who has pressed the power saving key has left, and sets the motion sensor invalid flag to "1". (S17), and shift to S15. On the other hand, in S16, when it is determined that the human sensor has detected a person (No in S16), the power supply control unit 203 shifts to S30.

In S30, the power supply control unit 203 determines whether or not the motion sensor array 280 has detected another person (new object). In S30, when another person is detected, as shown in FIG. 12 (C), the motion sensor array 280 detects a heat source 2 different from the heat source 1, and as shown in FIG. 12 (B). Corresponds to the case where various conditions are met.

Then, when it is determined in S30 that the motion sensor array 280 has not detected another person (new object) (No in S16), the power supply control unit 203 shifts to S15. On the other hand, when it is determined in S30 that the motion sensor has detected another person (new object) (Yes in S30), the power supply control unit 203 shifts to S18.

In S18, the power supply control unit 203 determines whether or not the normal power mode transition condition is satisfied. When the motion sensor invalid flag is "1", the power supply control unit 203 determines that the normal power mode transition condition is satisfied when the signal 531, 511, 501, 502, or 503 is received. On the other hand, when the motion sensor invalid flag is "0", the power supply control unit 203 determines that the normal power mode transition condition is satisfied when the signal 511, 501, 502, or 503 is received. However, in this case, the power supply control unit 203 determines that the normal power mode transition condition is not satisfied when the signal 531 is received. Further, in this case, when the power supply control unit 203 receives the signal 534, it determines that the normal power mode transition condition is satisfied. That is, when the motion sensor invalid flag is "1", the detection of the user who presses the power saving key on the motion sensor array 280 is ignored, but the detection of other users is valid, and the mode shifts to the normal power mode. Control.

In this embodiment, a motion sensor array is used, but any motion sensor may be used as long as it can recognize the number of detected objects. That is, any motion sensor may be used as long as it can recognize that a user other than the user who has pressed the power saving key 214 has been detected.

Further, a configuration in which Example 2 and Example 3 are combined may be used. That is, after shifting to the normal power mode, if there is no job, the job flag is set to "0", and if there is a job, the job flag is set to "1". Then, a configuration is added to the third embodiment in which the motion sensor invalid flag 599 is set to "0" when the job flag is "0" when the power saving key 214 is pressed. As a result, in addition to the configuration of the third embodiment, when the transition to the power saving mode is instructed by the power saving key 214 without the job being input after the transition to the normal power mode, the transition to the normal power mode is performed. You can add restrictive configurations.

It should be noted that the structure and contents of the various data described above are not limited to this, and it goes without saying that the structure and contents are various depending on the intended use and purpose.
Although one embodiment has been described above, the present invention can be implemented as, for example, a system, an apparatus, a method, a program, a storage medium, or the like. Specifically, it may be applied to a system composed of a plurality of devices, or may be applied to a device composed of one device.
Further, all the configurations in which the above examples are combined are also included in the present invention.

(Other Examples)
The present invention is also realized by executing the following processing. That is, software (program) that realizes the functions of the above-described embodiment is supplied to the system or device via a network or various storage media, and the computer (or CPU, MPU, etc.) of the system or device reads the program. This is the process to be executed.
Further, the present invention may be applied to a system composed of a plurality of devices or a device composed of one device.
The present invention is not limited to the above embodiments, and various modifications (including organic combinations of each embodiment) are possible based on the gist of the present invention, and these are excluded from the scope of the present invention. is not it. That is, all the configurations in which each of the above-described examples and modifications thereof are combined are also included in the present invention.

100 Image processing device 203 Power supply control unit 230 First motion sensor 231 Second motion sensor 281 Motion sensor return determination unit

Claims (14)

An image forming apparatus having at least a first power state and a second power state that consumes less power than the first power state.
Image forming means for forming an image and
A receiving means for accepting a user operation for shifting the power state of the image forming apparatus from the first power state to the second power state.
A first detecting means for detecting a person in front of the image forming apparatus,
A second detection means for detecting that a person has left the image forming apparatus,
The power state of the image forming apparatus is shifted from the second power state to the first power state based on the detection of a person by the first detection means, and based on the user operation received by the reception means. A transition means for shifting the power state of the image forming apparatus from the first power state to the second power state is provided.
The transition means shifts to the second power state based on the user operation, and then changes from the second power state of the power state of the image forming apparatus based on the detection of a person by the first detection means. When the transition to the first power state is prohibited and the second detection means detects that a person has left the image forming apparatus, the image forming apparatus based on the detection of the person by the first detecting means. An image forming apparatus, characterized in that the prohibition of transition from the second power state of the power state to the first power state is lifted. The second detecting means has a wider detection range in front of the image forming apparatus than the first detecting means, and can detect a person in front of the image forming apparatus.
The first aspect of claim 1, wherein the transition means is controlled so that power is supplied to the first detection means whose power supply is stopped based on the detection of a person by the second detection means. Image forming device. The second power state includes a first power saving state and a second power saving state of power saving from the first power saving state.
If a person is detected by the second detection means when the reception means receives the user operation, the transition means shifts from the first power state to the first power saving state, and the transition means shifts to the first power saving state. The claim is characterized in that if a person is no longer detected by the second detecting means after the receiving means receives the user operation, the state shifts from the first power state to the second power saving state. 2. The image forming apparatus according to 2. The image forming apparatus according to any one of claims 1 to 3, wherein the second detecting means is a pyroelectric sensor. The image forming apparatus according to any one of claims 1 to 4, wherein the first detecting means is a reflection sensor. Further comprising a storage means for storing information indicating prohibition of transition of the power state of the image forming apparatus from the second power state to the first power state based on the detection of a person by the first detection means.
The transition means has the first power from the second power state of the power state of the image forming apparatus based on the detection of a person by the first detection means while the information is stored in the storage means. The image forming apparatus according to any one of claims 1 to 5, wherein no transition to a state is performed. In the transition means, a signal indicating the detection of a person by the first detection means and a signal indicating information stored in the storage means are input, and the image forming apparatus is moved from the second power state to the first. The image forming apparatus according to claim 6, further comprising an AND gate logic element that outputs a transition request signal for shifting to the power state of the above. A method for controlling an image forming apparatus having at least a first power state and a second power state that consumes less power than the first power state.
Image formation steps to form an image and
A reception step for accepting a user operation for shifting the power state of the image forming apparatus from the first power state to the second power state, and
The first detection step of detecting a person in front of the image forming apparatus,
A second detection step for detecting that a person has left the image forming apparatus,
The power state of the image forming apparatus is shifted from the second power state to the first power state based on the detection of a person in the first detection step, and based on the user operation accepted in the reception step. A transition step for shifting the power state of the image forming apparatus from the first power state to the second power state is provided.
The transition step shifts to the second power state based on the user operation, and then changes from the second power state of the power state of the image forming apparatus based on the detection of a person by the first detection step. When the transition to the first power state is prohibited and it is detected by the second detection step that a person has left the image forming apparatus, the image forming apparatus based on the detection of the person by the first detection step A method for controlling an image forming apparatus, which removes the prohibition of transition of a power state from the second power state to the first power state. The second detection step has a wider detection range in front of the image forming apparatus than the first detection step, and can detect a person in front of the image forming apparatus.
The eighth aspect of the present invention is characterized in that the transition step is controlled so that power is supplied to the first detection step in which the power supply is stopped, based on the detection of a person in the second detection step. How to control the image forming device. The second power state includes a first power saving state and a second power saving state of power saving from the first power saving state.
In the transition step, if a person is detected in the second detection step when the reception step accepts the user operation, the transition from the first power state to the first power saving state is performed. The claim is characterized in that if a person is no longer detected by the second detection step after the reception step has received the user operation, the state shifts from the first power state to the second power saving state. 9. The method for controlling an image forming apparatus according to 9. The method for controlling an image forming apparatus according to any one of claims 8 to 10, wherein the second detection step is performed by a pyroelectric sensor. The method for controlling an image forming apparatus according to any one of claims 8 to 11, wherein the first detection step is based on a reflection sensor. Further comprising a storage means for storing information indicating the prohibition of transition of the power state of the image forming apparatus from the second power state to the first power state based on the detection of a person in the first detection step.
In the transition step, while the information is stored in the storage means, the first power from the second power state of the power state of the image forming apparatus based on the detection of a person by the first detection step. The control method for an image forming apparatus according to any one of claims 8 to 12, wherein no transition to a state is performed. In the transition step, a signal indicating the detection of a person in the first detection step and a signal indicating information stored in the storage means are input, and the image forming apparatus is moved from the second power state to the first. 13. The control method for an image forming apparatus according to claim 13, further comprising an AND gate logic element that outputs a transition request signal for shifting to the power state of the above.

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