Image forming system

Abstract

To improve energy efficiency while ensuring convenience for those who will use the device. [Solution] When the control unit detects a person at a distance of a first degree or less from the image forming apparatus using a human presence sensor, it restores the image forming apparatus from a first power state to a second power state with a higher power state than the first power state. When the control unit detects a person at a distance of a second degree or less from the image forming apparatus, which is shorter than the first distance, it restores the image forming apparatus to a third power state with a higher power state than the second power state.

Description

[Technical Field]

[0001] The present invention relates to an image forming system. [Background Art]

[0002] Patent Document 1 discloses an image forming apparatus including: a human body detection sensor that detects a human body positioned in a detection region within a predetermined range and has adjustable sensitivity; and a control unit that cancels the power saving mode in response to detection by the human body detection sensor during the power saving mode and causes an image forming unit to execute a job. [Prior Art Literature] [Patent Literature]

[0003] [Patent Document 1] Japanese Unexamined Patent Application Publication No. 2019-50627 [Summary of the Invention] [Problem to be Solved by the Invention]

[0004] Conventionally, there has been known an apparatus that automatically returns from a power saving state to a state capable of executing a job when a person passes around the apparatus. However, a person may simply pass by without using the apparatus. In this case, the apparatus returns to a job-executable state at an unnecessary timing, resulting in wasted power consumption. On the other hand, in a configuration where the apparatus returns to the job-executable state only after a person arrives in front of the apparatus, the user is forced to wait for a long time in front of the apparatus, which reduces convenience. An object of the present invention is to improve both the convenience for a person who will use the apparatus and the energy saving performance of the apparatus. [Means for Solving the Problem]

[0005] The invention described in claim 1 is an image forming system equipped with a processor, wherein the processor, when a person is detected by a human presence sensor at a distance of a first distance or less from the image forming apparatus, restores the image forming apparatus from a first power state to a second power state with a higher power state than the first power state, and when a person is detected by the human presence sensor at a distance of a second distance or less, which is shorter than the first distance from the image forming apparatus, restores the image forming apparatus to a third power state with a higher power state than the second power state. The invention described in claim 2 is an image forming system according to claim 1, characterized in that when the processor detects a person at a distance of the first distance or less by the human presence sensor, in a specific area which is the area connecting the location where the person was detected and the image forming apparatus within the detection area which is the area in which the human presence sensor can detect a person, the processor restores the image forming apparatus to the third power state when the processor detects a person at a distance of the third distance or less which is longer than the second distance from the image forming apparatus. The invention described in claim 3 is the image forming system according to claim 2, characterized in that the third distance is shorter than the first distance. The invention described in claim 4 is an image forming system according to claim 2, characterized in that the processor, with respect to an adjacent region adjacent to the specific region, restores the image forming apparatus to the third power state when it detects a person at a fourth distance or less, where the distance from the image forming apparatus is longer than the second distance. The invention described in claim 5 is the image forming system according to claim 4, characterized in that the fourth distance is shorter than the third distance. The invention described in claim 6 is an image forming system according to claim 2, characterized in that the processor, based on predetermined conditions, stops restoring the image forming apparatus to the third power state when it detects a person at or below the third distance. The invention described in claim 7 is an image forming system according to claim 1, characterized in that when the processor detects a person at or below the first distance using the human presence sensor, it sets the second distance using a predetermined coefficient for the distance from the image forming apparatus to the location where the person was detected. The invention described in claim 8 is an image forming system according to claim 1, characterized in that the processor divides the detection area, which is the area in which the human presence sensor can detect a person, into a plurality of radial areas centered on the image forming apparatus, and when the human presence sensor detects a person at or below the first distance in any of the divided areas, the processor restores the image forming apparatus to the third power state when it detects a person at or below the third distance, which is longer than the second distance from the image forming apparatus, in the divided area including the location where the person was detected. The invention described in claim 9 is an image forming system according to claim 8, characterized in that, with respect to an adjacent divided region adjacent to the divided region containing the location where a person was detected, the processor restores the image forming apparatus to the third power state when it detects a person at a fourth distance or less, where the distance from the image forming apparatus is longer than the second distance. The invention described in claim 10 is the image forming system according to claim 9, characterized in that the fourth distance is shorter than the third distance. The invention described in claim 11 is an image forming system according to claim 8, characterized in that the processor, based on predetermined conditions, stops restoring the image forming apparatus to the third power state when it detects a person at or below the third distance in the divided region. The invention described in claim 12 is an image forming system according to claim 11, characterized in that the predetermined condition is that the number of divided regions that cause the image forming apparatus to return to the third power state when a person is detected at or below the third distance exceeds a predetermined number. The invention described in claim 13 is an image forming system according to claim 1, characterized in that the processor divides the area in which the human presence sensor detects a person into a plurality of radial areas centered on the image forming apparatus, and when a person is detected in any of the divided areas at or below the first distance, the processor sets the second distance in the divided area using a predetermined coefficient for the distance from the image forming apparatus to the location where the person was detected. The invention described in claim 14 is an image forming system according to claim 13, characterized in that the processor releases the second distance set in the divided region based on predetermined conditions. [Effects of the Invention]

[0006] According to the invention of claim 1, it is possible to improve energy efficiency while ensuring convenience for the person who will use the device. According to the invention of claim 2, when a person is detected in the first region, the approach of a person who is likely to use the device can be detected at an earlier timing compared to a configuration in which a person is detected at a second distance in a specific region connecting the location where the person was detected and the image forming apparatus. According to the invention of claim 3, when a person is detected in the first region, the approach of a person who is likely to use the device can be detected at an earlier timing compared to a configuration in which a person is detected at a second distance in a specific region connecting the location where the person was detected and the image forming apparatus. According to the invention of claim 4, when a person is detected in the first area, compared to a configuration in which a person is not detected at a second distance in an adjacent area adjacent to a specific area, the device can respond more flexibly to the movements of the person who will be using the device. According to the invention of claim 5, when a person is detected in the first area, compared to a configuration in which a person is not detected at a second distance in an adjacent area adjacent to a specific area, the device can respond more flexibly to the movements of the person who will be using the device. According to the invention of claim 6, energy efficiency can be improved compared to the case in which the state of returning to the third power state when a person is detected at a distance of third or less is unconditionally continued. According to the invention of claim 7, compared to not defining a coefficient for calculating the second distance, it becomes possible to set the second distance according to the user's usage. According to the invention of claim 8, the second distance and the third distance can be set for each divided area, making it possible to make detailed settings according to the user's usage. According to the invention of claim 9, when a person is detected in the first region, compared to a configuration in which a person is not detected at a second distance in an adjacent region adjacent to the specific divided region, the device can respond more flexibly to the movements of the person who will be using the device. According to the invention of claim 10, when a person is detected in the first region, compared to a configuration in which a person is not detected at a second distance in an adjacent region adjacent to the specific divided region, the device can respond more flexibly to the movements of the person who will be using the device. According to the invention of claim 11, energy efficiency can be improved compared to the case in which the state of returning to the third power state when a person is detected at a distance of third distance or less is unconditionally continued. According to the invention of claim 12, energy efficiency can be improved compared to the case in which the state of returning to the third power state when a person is detected at a distance of third distance or less is unconditionally continued. According to the invention of claim 13, compared to not defining a coefficient for calculating the second distance, it becomes possible to set the second distance according to the user's usage. According to the invention of claim 14, energy efficiency can be improved compared to the case in which the state of returning to the third power state when a person is detected at a distance of third distance or less is unconditionally continued. [Brief explanation of the drawing]

[0007] [Figure 1] This figure shows an example of the overall configuration of the image forming system in the first embodiment. [Figure 2] Figure 1 shows an example of the hardware configuration of the image forming apparatus. [Figure 3] This figure shows a specific example of a second distance pre-set within the detectable area. [Figure 4]It is a conceptual diagram showing the power state of the image forming apparatus in FIG. 2. [Figure 5] It is a diagram showing an example of the functional configuration of the CPU of the image forming apparatus in FIG. 2. [Figure 6] It is a flowchart showing an example of the flow of processing for detecting a person based on a preset second distance, among the power state transition processing performed by the image forming apparatus in FIG. 5. [Figure 7] It is a diagram showing an example of the functional configuration of the CPU of the image forming apparatus included in the image forming system according to the second embodiment. [Figure 8] It is a diagram for explaining the processing of setting the second distance, the third distance, or the fourth distance in the detectable area. [Figure 9] It is a diagram for explaining the processing of setting the second distance, the third distance, or the fourth distance in the detectable area. [Figure 10] It is a diagram for explaining the processing of setting the second distance, the third distance, or the fourth distance in the detectable area. [Figure 11] It is a diagram for explaining the processing of setting the second distance, the third distance, or the fourth distance in the detectable area. [Figure 12] It is a diagram for explaining the processing of setting the second distance, the third distance, or the fourth distance in the detectable area. [Figure 13] It is a diagram for explaining the processing of setting the second distance, the third distance, or the fourth distance in the detectable area. [Figure 14] It is a diagram for explaining the processing of setting the second distance, the third distance, or the fourth distance in the detectable area. [Figure 15] It is a diagram for explaining the processing of setting the second distance, the third distance, or the fourth distance in the detectable area. [Figure 16] It is a flowchart showing an example of the flow of processing for detecting a person by setting the second distance, among the power state transition processing performed by the image forming apparatus in FIG. 7. [Figure 17]Figure 7 shows a flowchart illustrating an example of the process flow for detecting a person by setting a third distance, which is part of the power state transition process performed by the image forming apparatus. [Modes for carrying out the invention]

[0008] Embodiments of the present invention will be described below with reference to the attached drawings. <First Embodiment> [Configuration of the image forming system] Figure 1 is a diagram showing an example of the overall configuration of the image forming system 1 in the first embodiment. The image forming system 1 includes an image forming apparatus 2 equipped with various functions such as printing, scanning, and copying. The image forming apparatus 2 is intended to be installed in places where people come and go, such as offices or shared spaces. Figure 1 shows the control unit 10, operation unit 30, display unit 40, image reading unit 50, and image forming unit 60 of the image forming apparatus 2, but their configurations will be explained with reference to Figure 2.

[0009] [Hardware configuration of the image forming apparatus] Figure 2 shows an example of the hardware configuration of the image forming apparatus 2 shown in Figure 1. As shown in Figure 2 and Figure 1 above, the image forming apparatus 2 comprises a control unit 10, an operation unit 30, a display unit 40, an image reading unit 50, and an image forming unit 60. Furthermore, as shown in Figure 2, the image forming apparatus 2 also comprises a storage unit 20, a communication unit 70, and a human presence sensor 100. Each of these functional units is connected to a bus 101, and data is exchanged via this bus 101.

[0010] The control unit 10 controls each of the above-mentioned functional units in the image forming apparatus 2. The control unit 10 includes a CPU (Central Processing Unit) 11, which is a calculation means, and RAM (Random Access Memory) 12 and ROM (Read Only Memory) 13, which are storage means. The RAM 12 is the main memory and is used as working memory when the CPU 11 performs calculations. The ROM 13 holds data such as programs and pre-prepared setting values, and the CPU 11 reads programs and data directly from the ROM 13 and executes them. Programs and data are also stored in the storage unit 20. The CPU 11 reads the programs stored in the storage unit 20 into the RAM 12 and executes them.

[0011] In this embodiment, the CPU 11 of the control unit 10 reads and executes a program to realize various functions. The functions realized in this embodiment include control of the operation of each functional unit, control of the power state of the image forming apparatus 2, and control of the area in which the human presence sensor 100 can detect the presence of a person (hereinafter sometimes referred to as the "detectable area"). Details of these functions will be described later.

[0012] The memory unit 20 is a functional unit that stores programs and data for the CPU 11 to execute, as well as various data generated by various operations, such as image data read by the image reading unit 50. The memory unit 20 can be implemented, for example, by a storage device such as a magnetic disk drive or an SSD (Solid State Drive).

[0013] The operation unit 30 is a functional unit that receives user input. The operation unit 30 is composed of, for example, hardware keys or touch sensors that output control signals corresponding to the position pressed or touched by a finger or the like. It may also be configured as a touch panel, combining a touch sensor with a liquid crystal display that constitutes the display unit 40.

[0014] The display unit 40 is a functional unit that displays information images that present various information to the user, preview images of images to be processed such as read or output, and operation images for the user to perform operations. The display unit 40 is composed of, for example, a liquid crystal display. The operation unit 30 and the display unit 40 can be combined and used as a user interface means for the user to input and output information to the image forming apparatus 2.

[0015] The image reading unit 50 is a functional unit that optically reads an image on the document. The image reading method is not particularly limited, and may be a CCD method in which the reflected light from the light source irradiated onto the document is reduced by a lens and received by a CCD (Charge Coupled Device). Alternatively, it may be a CIS method in which the reflected light from the light emitted sequentially from an LED (Light Emitting Diode) light source onto the document is received by a CIS (Contact Image Sensor).

[0016] The image forming unit 60 is a functional unit that forms an image based on image data on a medium such as paper using an image forming material. As a method for forming an image on a medium, for example, an electrophotographic method is used, in which toner is used as the image forming material, and the toner attached to the photoreceptor is transferred to the medium to form an image.

[0017] The communication unit 70 is a functional unit that sends and receives commands and data to and from an external device. The communication unit 70 uses an interface that corresponds to the communication method with the external device. The connection with the external device may be made via a network or by direct connection. The communication line may be a wired line or a wireless line.

[0018] The human presence sensor 100 is a sensor that detects people present in the vicinity of the image forming apparatus 2. For example, the human presence sensor 100 can be a detection sensor equipped with an output unit that outputs a signal and a detection unit that detects that signal. In this case, the human presence sensor 100 will obtain different detection results depending on whether the signal transmitted from the output unit is detected by the detection unit. The human presence sensor 100 can be any type of sensor that can detect the presence of moving objects such as people.

[0019] The human presence sensor 100 can be, for example, an ultrasonic sensor, a light-based sensor, a radio wave-based sensor, or a sensor that recognizes human body temperature. It can also recognize a person by analyzing images captured by various imaging methods. One example of such a sensor is one in which a signal transmitted from the output unit reaches a person, and the reflected signal is detected by the detection unit to detect the person's presence. In this configuration, if no reflected signal is detected, the presence of a person is not detected.

[0020] For example, in an ultrasonic sensor, ultrasonic waves transmitted from the output unit reach a person, and detection is performed by receiving the reflected ultrasonic waves in the detection unit. Similarly, in a light-based sensor, light emitted from the output unit reaches a person, and detection is performed by receiving the reflected light in the detection unit. In a radio wave-based sensor, radio waves emitted from the output unit reach a person, and detection is performed by receiving the reflected radio waves in the detection unit.

[0021] The human presence sensor 100 in this embodiment includes a function to adjust the output strength of the output unit. The human presence sensor 100 can change its detectable area by, for example, adjusting the output strength of the output unit. Specifically, increasing the output strength allows the signal to travel further, thus widening the detectable area. On the other hand, decreasing the output strength shortens the signal's range, narrowing the detectable area.

[0022] [Detectable area] Figure 3 shows a specific example of a second distance pre-set in the detectable area 200. The human presence sensor 100 of the image forming apparatus 2 outputs a signal, such as ultrasound, in a specific direction at a predetermined output intensity to detect the presence of a person within a specific range. The human presence sensor 100 also outputs this signal sequentially in multiple directions while changing the angle. In this way, the human presence sensor 100 searches for the presence of a person in a detectable area 200 that extends in an arc shape from the image forming apparatus 2.

[0023] For example, the motion sensor 100 has a detectable area 200 ranging from approximately 0° to 120° centered on the device, and can output signals while changing the angle in increments of approximately 10°. Note that this angle setting is just an example, and other setting values ​​can be used.

[0024] As a method for the image forming apparatus 2 to control the output direction of the signal from the human presence sensor 100, for example, the output section of the human presence sensor 100 itself may be rotated by a motor to change the output direction of the signal. Alternatively, as another method, the output section of the human presence sensor 100 may be fixed, and the signal may be reflected using a mirror member whose angle can be adjusted by a motor, thereby controlling the output direction without rotating the output section.

[0025] As a result, a detectable area 200 is formed that extends in an arc shape from the image forming apparatus 2, as shown in Figure 3. Note that the detectable area 200 shown in Figure 3 is just an example and is not particularly limited. The detectable area 200 is set taking into account the environment in which the image forming apparatus 2 is installed. It is also possible to expand or contract the detectable area 200 by controlling the output direction of the signal from the human presence sensor 100.

[0026] Furthermore, the detectable area 200 consists of multiple areas (hereinafter referred to as "divided areas") corresponding to each direction from which the motion sensor 100 outputs a signal. Figure 3 shows an example of divided areas 1 to 12. The motion sensor 100 outputs signals sequentially to divided areas 1 to 12 to detect the presence of a person in each area. Note that the order of signal output is not limited to the above. For example, signals may be output sequentially from divided area 12 to 1. Also, the number of divided areas is just an example and is not limited to the 12 divided areas shown in Figure 3.

[0027] Furthermore, it is possible to pre-set the range within the detectable area that the motion sensor 100 will detect. For example, if the image forming apparatus 2 is installed in a corner such as against a wall in a room, or in a place with a lot of foot traffic, the motion sensor 100 may react unnecessarily. In such cases, by pre-setting the range within the detectable area 200 that the motion sensor 100 will detect, it is possible to prevent unnecessary detection by the motion sensor 100. For example, the range from division areas 7 to 12 shown in Figure 3 may be set to be excluded from detection. In this case, by controlling the direction in which the output unit of the motion sensor 100 outputs a signal, it is possible to configure it to detect the presence of a person in the range from division areas 1 to 6. The motion sensor 100 detects the presence of a person within the detectable area 200 by repeatedly outputting a signal sequentially for each division area.

[0028] Furthermore, the detectable region 200 consists of multiple regions (hereinafter referred to as "distance regions") corresponding to the distance from the image forming apparatus 2. The distance regions are regions formed according to a threshold distance from the image forming apparatus 2. For example, in Figure 3, distance d1, which is the first distance in the present invention, and distance d2, which is the second distance in the present invention and is shorter than distance d1, are set as threshold distances from the image forming apparatus 2. Distance d1 is the threshold distance that defines the detectable region 200. Distance d2 is the threshold distance that defines distance regions 201 and 202 in the detectable region 200. Distances d1 and d2 are used in the process of transitioning the power state of the image forming apparatus 2 (hereinafter referred to as "power state transition process"). In this embodiment, distances d1 and d2 are set in advance. Details of the power state transition process will be described later with reference to Figures 4 and later.

[0029] In this embodiment, the human presence sensor 100 can also be provided with multiple independent output units. For example, an output unit corresponding to each region can be provided to search for the presence of a person within each region. In this case, taking the divided regions 1 to 12 shown in Figure 3 as an example, a configuration can be adopted in which 12 output units corresponding to each region are provided to search each region individually, and signals are output in different directions. When such a configuration is adopted, it becomes possible to search each region simultaneously, thereby improving detection accuracy. Alternatively, a configuration can be used in which multiple output units are provided in a number smaller than the number of divided regions, and these outputs are output at different angles.

[0030] [Power status of the image forming apparatus] Next, the power state of the image forming apparatus 2 will be explained with reference to Figures 1 to 4. Figure 4 is a conceptual diagram showing the power state of the image forming apparatus 2 in Figure 2. The image forming apparatus 2 can have multiple power modes with different power consumption levels. In other words, the image forming apparatus 2 can be set to multiple power states with different power consumption levels. In this embodiment, the image forming apparatus 2 can be set to three types of power states consisting of a first to a third power state, which are multiple power states with different power consumption levels. Specifically, it can be set to a "minimum power state" (first power state) with the power consumption minimized, a "low power state" (second power state) with a power consumption greater than the minimum power state, and a "standby state" (third power state) with a power consumption greater than the low power state.

[0031] The minimum power state is an example of a power state applied to minimize the power consumption of the image forming apparatus 2 when no jobs are running. The minimum power state is also known as the sleep state. In the minimum power state, the system is controlled so that only the minimum necessary functions, such as the human presence sensor 100 and parts of the control unit 10, are activated. Specifically, for example, the operation of each functional unit, such as the display unit 40, image reading unit 50, and image forming unit 60, is stopped, except for some functional units such as parts of the operation unit 30 and the communication unit 70 that operate when the image forming apparatus 2 is returned to a state where jobs can be executed. The operating state of each functional unit in the minimum power state is set taking into consideration the operating state necessary for the image forming apparatus 2.

[0032] The low-power state is an example of a power state applied when the image forming apparatus 2 can be restored more quickly than in the minimum-power state, while consuming less power than in the standby state. The low-power state is a power state that lies between the minimum-power state and the standby state. The operating state of each functional unit in the low-power state is set taking into consideration the operating state necessary for the image forming apparatus 2.

[0033] The standby state is an example of a power state in which each functional unit is activated and job execution is possible. In the standby state, jobs such as printing, scanning, and copying can be executed. However, in the standby state, power consumption increases because power needs to be supplied to each functional unit, such as the display unit 40 which functions when displaying the operation screen, and the image forming unit 60 which functions when forming images.

[0034] The image forming apparatus 2 in this embodiment enables power state transition processing for the three power states described above. The control of the power state transition processing is realized by the CPU 11 (see Figure 2) of the control unit 10 reading and executing a program. Specifically, the image forming apparatus 2 enables recovery by transitioning from the standby state to the minimum power state via the low power state, and then from the minimum power state to the standby state via the low power state. Furthermore, the image forming apparatus 2 enables recovery by transitioning directly from the standby state to the minimum power state without going through the low power state, and then from the minimum power state to the standby state without going through the low power state.

[0035] [Functional configuration of an image forming apparatus] Next, the functional configuration of the image forming apparatus 2 will be explained with reference to Figures 1 to 5. Figure 5 shows an example of the functional configuration of the CPU 11 of the image forming apparatus 2 shown in Figure 2. In the CPU 11 of the image forming apparatus 2, the acquisition unit 111, the management unit 112, the determination unit 113, and the power state control unit 114 function to realize the power state transition process shown in Figure 4.

[0036] The acquisition unit 111 acquires the detection result of the human presence sensor 100 shown in Figure 2. For example, when the human presence sensor 100 detects a person, the acquisition unit 111 acquires the distance from the image forming apparatus 2 to the location where the person was detected (hereinafter referred to as the "detection distance") as the detection result. The management unit 112 stores and manages the acquired detection results in the storage unit 20 shown in Figure 2. For example, the management unit 112 stores and manages the detection results acquired by the acquisition unit 111 in the storage unit 20.

[0037] The determination unit 113 makes various determinations based on the detection results of the human presence sensor 100. For example, the determination unit 113 determines whether a person has entered the detectable area 200 (see Figure 3) based on the detection distance as a detection result. The determination unit 113 also determines whether the person has left the detectable area 200 based on the detection distance as a detection result.

[0038] The determination by the determination unit 113 to determine whether a person has entered the detectable area 200 includes determining whether a person has entered the distance area 201 (see Figure 3) and determining whether a person has entered the distance area 202 (see Figure 3). Furthermore, the determination by the determination unit 113 to determine whether a person has left the detectable area 200 includes determining whether a person has left the area outside the detectable area 200 from the distance area 201 and determining whether a person has left the area outside the detectable area 200 from the distance area 202.

[0039] Furthermore, determining whether a person has entered distance region 201 includes determining whether a person entered distance region 201 from outside the detectable region 200, as well as determining whether a person moved from distance region 202 to distance region 201. Similarly, determining whether a person has entered distance region 202 includes determining whether a person entered distance region 202 from outside the detectable region 200, as well as determining whether a person moved from distance region 201 to distance region 202.

[0040] Furthermore, determining whether a person has left distance region 201 includes determining whether a person has left distance region 201 outside the detectable region 200, as well as determining whether a person has moved from distance region 201 to distance region 202. Similarly, determining whether a person has left distance region 202 includes determining whether a person has left distance region 202 outside the detectable region 200, as well as determining whether a person has moved from distance region 202 to distance region 201.

[0041] The power state control unit 114 controls the power state of its own device based on the determination result of the determination unit 113. Specifically, if the determination unit 113 determines that a person has entered the distance area 201 from outside the detectable area 200, the power state control unit 114 controls the power state to shift from the minimum power state to the low power state. Also, if the determination unit 113 determines that a person has moved from the distance area 201 to the distance area 202, the power state control unit 114 controls the power state to shift from the low power state to the standby state and restore it to operation.

[0042] Furthermore, if the determination unit 113 determines that a person has moved from distance region 202 to distance region 201, the power state control unit 114 performs control to transition the power state from standby state to low power state. Also, if the determination unit 113 determines that a person has left distance region 201 outside the detectable region 200, the power state control unit 114 performs control to transition the power state from low power state to minimum power state.

[0043] Furthermore, if the power state control unit 114 determines, based on the determination unit 113, that a person has entered the distance region 202 from outside the detectable region 200, it performs control to transition the power state from the minimum power state to the standby state without going through the low power state and then returns to normal. Also, if the power state control unit 114 determines, based on the determination unit 113, that a person has left the distance region 202 and gone outside the detectable region 200, it performs control to transition the power state from the standby state to the minimum power state without going through the low power state.

[0044] [Flow of power state transition process] Next, the flow of the power state transition process in the first embodiment will be described with reference to Figures 1 to 6. Figure 6 is a flowchart showing an example of the process flow for detecting a person based on a preset second distance, which is part of the power state transition process performed by the image forming apparatus 2 in Figure 5. The image forming apparatus 2 maintains the lowest power state when no one is in the detectable area 200 (see Figure 3). When the motion sensor 100 detects that a person has entered the distance area 201 from outside the detectable area 200 (YES in step 101), the image forming apparatus 2 transitions from the lowest power state to the low power state (step 102). Conversely, if the motion sensor 100 does not detect anything (NO in step 101), the image forming apparatus 2 repeats the decision process in step 101.

[0045] If the detection distance of the person detected in step 101 becomes less than or equal to the second distance (YES in step 103), the image forming apparatus 2 determines that a person has entered the distance region 202 and returns to operation by switching from a low-power state to a standby state (step 104). This completes the process (END). On the other hand, if the detection distance exceeds the second distance (NO in step 103), the image forming apparatus 2 proceeds to the decision process in step 105.

[0046] If the detection distance of the person detected in step 101 is between the first distance and the second distance (YES in step 105), the image forming apparatus 2 determines that the person is still in the distance region 201. In the example in Figure 3, if the detection distance is between distance d1 and distance d2, it is determined that the person is still in the distance region 201. In this case, the image forming apparatus 2 returns to the decision process in step 103. Conversely, if the detection distance of the person detected by the human presence sensor 100 in step 101 is not between the first distance and the second distance (NO in step 105), the image forming apparatus 2 determines that the person has left the detectable region 200. In the example in Figure 3, if the detection distance is not between distance d1 and distance d2, the image forming apparatus 2 determines that the person has left the detectable region 200. In this case, the image forming apparatus 2 returns to the decision process in step 101.

[0047] <Second Embodiment> [Functional configuration of an image forming apparatus] Next, the functional configuration of the image forming apparatus 3 included in the image forming system of the second embodiment will be described with reference to Figures 1 to 15. Figure 7 shows an example of the functional configuration of the CPU 11 of the image forming apparatus 3 included in the image forming system of the second embodiment. Figures 8 to 15 illustrate the process of setting a second distance, a third distance, or a fourth distance in the detectable area 200.

[0048] The configuration of the image forming system in the second embodiment is basically the same as the configuration illustrated in Figure 1, and the hardware configuration of the image forming apparatus 3 of the image forming system in the second embodiment is also basically the same as the configuration illustrated in Figure 2. However, in the first embodiment described above, the second distance is set in advance, whereas in the second embodiment, the second distance is set according to the situation. The setting of the second distance is performed by the control of the setting unit 115 shown in Figure 7.

[0049] (Setting the second distance) The setting unit 115 shown in Figure 7 enables setting a second distance using a predetermined coefficient relative to the detection distance of a person when a person is detected at or below a first distance in any of the divided regions. The setting unit 115 sets the second distance using the predetermined coefficient for each divided region. For example, if the predetermined coefficient is 0.5, the distance calculated by multiplying the detection distance by 0.5 (i.e., half the detection distance) is set as the second distance.

[0050] Figures 8 to 11 show specific examples of the process of setting a second distance in the detectable area 200. In the examples in Figures 8 to 11, the first distance, distance d1, is assumed to be 200 cm and the predetermined coefficient is 0.5. In this case, the detectable area 200 is defined by distance d1. The setting unit 115 does not set the second distance unless a person enters the detectable area 200. Therefore, as shown in Figure 8, when no person is in the detectable area 200, only the distance area 201 is formed in the detectable area 200. In the state shown in Figure 8, the power state control unit 114 controls the image forming apparatus 3 to be in the lowest power state.

[0051] Here, as shown in Figure 9, suppose a person 500 enters the divided region 5 of the detectable region 200. Then, the power state control unit 114 controls the power state of the image forming apparatus 3 to transition from the minimum power state to the low power state. The setting unit 115 also sets a second distance, distance d2, to the divided region 5 based on a predetermined coefficient of 0.5. For example, if the detection distance of a person 500 entering the divided region 5 is 180m, then 90m, obtained by multiplying 180m by the predetermined coefficient of 0.5, is set as the distance d2. As a result, a distance region 202 is formed in the divided region 5. In the state shown in Figure 9, the power state control unit 114 controls the image forming apparatus 3 to remain in a low power state as long as the person 500 remains in the distance region 201. However, if the person 500 moves from the distance region 201 to the distance region 202, the power state control unit 114 controls the power state of the image forming apparatus 3 to transition from the low power state to the standby state and restore it.

[0052] Subsequently, as shown in Figure 10, suppose person 500 moves in the direction of the arrow. This means that person 500 has moved from divided area 5 to divided areas 6 and 7 in that order. In this case, the setting unit 115 sets the distance d2 based on a predetermined coefficient of 0.5 for divided areas 6 and 7 in accordance with person 500's movement. As a result, distance areas 202 are formed in each of divided areas 5 to 7. In the state shown in Figure 10, even if person 500 moves across divided areas, the power state control unit 114 controls the image forming apparatus 3 to remain in a low-power state as long as it remains in distance area 201. However, if person 500 moves from distance area 201 to distance area 202, the power state control unit 114 controls the power state of the image forming apparatus 3 to transition from the low-power state to the standby state and restore it.

[0053] As another example, suppose that person 500 moves from divided area 5 to divided areas 6 through 9 in that order, as indicated by the arrows in Figure 11. In this case, the setting unit 115 sets the distance d2 based on a predetermined coefficient of 0.5 in accordance with the movement of person 500, in the order of divided areas 6 through 9. However, the setting of distance d2 may be canceled if predetermined conditions are met.

[0054] In other words, the setting unit 115 makes it possible to release the setting of the second distance when a predetermined condition is met. Hereinafter, the condition for releasing the distance set by the setting unit 115 will be referred to as the "release condition". The release condition may be, for example, that it is determined that a person 500 has left the detectable area 200, or that a predetermined amount of time has elapsed since the second distance was set. Alternatively, the release condition may be that the number of divided areas to which the second distance has been set exceeds a predetermined number. In this case, the "predetermined number" is the number of areas to which the second distance can be set simultaneously.

[0055] In the example in Figure 11, it is assumed that the release condition was predetermined to be when the number of division areas with a second distance set exceeds "2". Therefore, Figure 11 shows the state in which the distance d2 set for each of division areas 5 to 9, specifically the distance d2 set for each of division areas 5 to 7, has been released.

[0056] (Setting the third distance) Furthermore, the setting unit 115 shown in Figure 7 allows setting a third distance, which is defined as a specific region, when a person is detected at or below the first distance. The third distance is set to be longer than the second distance and shorter than the first distance. The third distance is used in the power state transition process, similar to the first and second distances.

[0057] Figures 12 and 13 show specific examples of when a third distance is set in the detectable area 200. In the examples in Figures 12 and 13, the second distance is assumed to be a predetermined distance d2. As shown in Figure 12, when a person 500 enters the distance area 201 of the divided area 5 of the detectable area 200, the power state control unit 114 controls the power state of the image forming apparatus 3 to shift from the minimum power state to the low power state. The setting unit 115 also sets the third distance, distance d3, as a specific area in the divided area 5 into which the person 500 entered.

[0058] The distances d3 shown in Figures 12 and 13 are threshold distances that define the distance region 203 in the divided region 5, which is a specific area. Therefore, when a distance d3 is set in the divided region 5, a distance region 203 is formed in the divided region 5. Note that the third distance (distance d3) set in a specific area can be set within the range of the specific area, so its length is not necessarily uniform. For example, it may be set to be slightly shorter than distance d1, as in the distance d3 shown in Figure 12, or it may be set to be about half the length of distance d1, as in the distance d3 shown in Figure 13.

[0059] When a distance region 203 is formed in a specific area, the determination unit 113 determines, based on the detection distance as the detection result of the human presence sensor 100, whether a person 500 has entered the distance region 203 and whether a person 500 has left the distance region 203. The determination of whether a person 500 has entered the distance region 203 includes determining whether a person 500 has moved from distance region 201 to distance region 203 and whether a person 500 has moved from distance region 202 to distance region 203. The determination of whether a person 500 has left the distance region 203 includes determining whether a person 500 has moved from distance region 203 to distance region 201 and whether a person 500 has moved from distance region 203 to distance region 202.

[0060] When a distance region 203 is formed in a specific area, the power state control unit 114 performs the following power state control. Specifically, when the determination unit 113 determines that a person 500 has moved from distance region 201 to distance region 203, the power state control unit 114 performs control to transition the power state from the low power state to the standby state and restore it. Also, when the determination unit 113 determines that a person 500 has moved from distance region 203 to distance region 201, the power state control unit 114 performs control to transition the power state from the standby state to the low power state.

[0061] Furthermore, if the determination unit 113 determines that the person 500 has moved from the distance region 201 to outside the detectable region 200, the power state control unit 114 performs control to transition the power state from the low power state to the minimum power state. However, if the determination unit 113 determines that the person 500 has moved from the distance region 203 to the distance region 202, or if it determines that the person 500 has moved from the distance region 202 to the distance region 203, the power state control unit 114 does not change the power state. In these cases, the power state control unit 114 controls the power state to maintain the standby state.

[0062] Therefore, the power state control unit 114 controls the image forming apparatus 3 to enter a low-power state when the person 500 enters the state shown in Figure 13, that is, when the person enters the distance region 201. Subsequently, as shown in Figure 13, when the person 500 moves straight towards the image forming apparatus 3 in the direction indicated by the white arrow and enters the distance region 203, the determination unit 113 determines that the person 500 has moved from the distance region 201 to the distance region 203. Then, the power state control unit 114 controls the image forming apparatus 3 to transition from a low-power state to a standby state.

[0063] In contrast, as indicated by the black arrow, if person 500 passes through the detectable area 200 without heading toward the image forming apparatus 3, the determination unit 113 determines that person 500 has left the distance area 201 and moved outside the detectable area 200. In this case, the setting unit 115 performs the process of setting the distance d3 in a specific area in accordance with the movement of person 500, in the order of divided areas 6 to 12, and when the above release condition is met, the setting of distance d3 is released.

[0064] In other words, the setting unit 115 makes it possible to release the setting of the third distance when the release condition is met. The release condition for releasing the setting of the third distance may be the same as the release condition for releasing the setting of the second distance described above, for example, that it is determined that a person 500 has left the detectable area 200. Alternatively, it may be that a predetermined amount of time has elapsed since the third distance was set. Alternatively, it may be that the number of divided areas for which the third distance has been set exceeds a predetermined number. In this case, the "predetermined number" is the number of times the third distance can be set simultaneously.

[0065] In the example shown in Figure 13, it is assumed that a predetermined release condition is that it is determined that person 500 has left the detectable area 200. Therefore, as shown by the black arrow in Figure 13, when person 500 leaves the detectable area 200, the setting unit 115 determines that the release condition has been met and releases the setting of the third distance, distance d3.

[0066] (Setting the fourth distance) Furthermore, the setting unit 115 shown in Figure 7 enables setting a fourth distance in an adjacent region adjacent to a specific region when a third distance is set in that specific region. Specifically, when a person is detected at or below the first distance, the setting unit 115 sets a third distance, designating the region connecting the detected location and the image forming apparatus 3 as the specific region, and further enables setting a fourth distance in an adjacent region. The fourth distance is set to be longer than the second distance and shorter than the first distance. The fourth distance is used in the power state transition process, similar to the first, second, and third distances.

[0067] Figure 14 shows a specific example of when a fourth distance is set in the detectable area 200. As shown in Figure 14, when a person 500 enters the distance area 201 of the divided area 5 of the detectable area 200, the power state control unit 114 controls the power state of the image forming apparatus 3 to shift from the minimum power state to the low power state. In addition, the setting unit 115 sets a third distance, distance d3, in the divided area 5 into which the person 500 entered, and further sets fourth distances, distances d41 and d42, in the divided areas 4 and 6 adjacent to divided area 5, respectively.

[0068] The distances d41 and d42 shown in Figure 14 are threshold distances that define the distance region 203 in each of the divided regions 4 and 6. Therefore, when distances d41 and d42 are set in each of the divided regions 4 and 6, a distance region 203 is formed in each of the divided regions 4 and 6. Distance d41 is the threshold distance that defines the distance region 203 in divided region 4. Similarly, distance d42 is the threshold distance that defines the distance region 203 in divided region 6. Note that the fourth distances (distances d41 and d42) set in adjacent regions can be set within the range of the adjacent regions, so their lengths are not necessarily uniform.

[0069] When a distance region 203 is formed in an adjacent area, the determination unit 113 determines, based on the detection distance as a result of the human presence sensor 100, whether a person 500 has entered the distance region 203 and whether a person 500 has left the distance region 203. The determination of whether a person 500 has entered the distance region 203 and whether a person 500 has left the distance region 203 is as described above.

[0070] A person entering a specific area may not proceed directly toward the image forming apparatus 3. For example, as shown in Figure 14, person 500 may move in the direction of the arrow, entering the specific area, divided area 5, and then immediately moving toward the adjacent area, divided area 6. Even in such cases, since a distance area 203 is also formed in divided area 6, the power state control unit 114 maintains the standby state.

[0071] Figure 15 shows a specific example of the process of canceling the settings for the third and fourth distances. Figure 15 shows an example where two people pass through the detectable area 200 with a time difference. In Figure 15, Path A is the path of the first person who passed through the detectable area 200 first, indicated by an arrow. Path B is the path of the second person who passed through the detectable area 200 later, indicated by an arrow.

[0072] When the first person passes through the detectable area 200 via path A, a third distance, distance d3, is set for each divided area in accordance with the movement of the first person within the detectable area 200. In the example in Figure 15, since path A passes through all of divided areas 1 to 12, distance d3 is set for all of divided areas 1 to 12. As a result, distance areas 203 are formed in all of divided areas 1 to 12.

[0073] After distance regions 203 are formed in all of division regions 1 to 12, if the first person leaves the detectable region 200, it is determined that the release condition has been met, and the setting of distance d3 is released. However, there are cases where a second person enters the detectable region 200 before the first person leaves the detectable region 200. In this case, since distance regions 203 are formed in at least a part of division regions 1 to 12 when the second person enters the detectable region 200, the second person may unintentionally enter the distance region 203. When the second person enters the distance region 203, the image forming apparatus 3 automatically switches to standby mode and returns to normal operation. In this case, the image forming apparatus 3 returns to normal operation unnecessarily, which is problematic in terms of energy saving.

[0074] In contrast, the above problem can be solved by pre-defining a release condition, which is that a predetermined amount of time must have elapsed since the third distance was set. In this case, the "predetermined time" is not particularly limited and may be defined as, for example, the time it is assumed that a person will take to walk a distance d1.

[0075] [Flow of power state transition process] Next, the flow of the power state transition process in the second embodiment will be described with reference to Figures 7 to 16. Figure 16 is a flowchart showing an example of the process flow for detecting a person by setting a second distance, which is part of the power state transition process performed by the image forming apparatus 3 in Figure 7. The image forming apparatus 3 maintains the minimum power state when no one is in the detectable area 200 (see Figure 8). When the motion sensor 100 detects that a person has entered the distance area 201 from outside the detectable area 200 (YES in step 201), the image forming apparatus 3 transitions from the minimum power state to the low power state (step 202) and proceeds to the process in step 203. Conversely, if the motion sensor 100 does not detect anything (NO in step 201), the image forming apparatus 3 repeats the decision process in step 201.

[0076] The image forming apparatus 3 sets a second distance (step 203). Specifically, the image forming apparatus 3 sets a distance d2, which is a second distance, using a predetermined coefficient with respect to the detection distance of the person detected in step 201 (see Figure 9). When the detection distance of the person detected in step 201 becomes less than or equal to the second distance (YES in step 204), the image forming apparatus 3 determines that a person has entered the distance region 202 and returns to operation by transitioning from a low-power state to a standby state (step 205). This completes the process (END). On the other hand, if the detection distance exceeds the second distance (NO in step 204), the image forming apparatus 3 proceeds to the decision process in step 206.

[0077] The image forming apparatus 3 determines that a person is staying in the distance region 201 if the detection distance of the person detected in step 201 is between the first distance and the second distance (YES in step 206). In the example of Figure 9 above, it is determined that a person 500 is staying in the distance region 201 when the detection distance is between distance d1 and distance d2. In this case, the image forming apparatus 3 returns to the decision process in step 204.

[0078] In contrast, if the detection distance of the person detected by the motion sensor 100 in step 201 is not between the first distance and the second distance (NO in step 206), the image forming apparatus 3 determines that the person has left the detectable area 200. In the example of Figure 9 above, if the detection distance is not between distance d1 and distance d2, the image forming apparatus 3 determines that the person 500 has left the detectable area 200. In this case, the image forming apparatus 3 returns to the decision process in step 201.

[0079] Figure 17 is a flowchart showing an example of the process flow for detecting a person by setting a third distance, which is part of the power state transition process performed by the image forming apparatus 3 in Figure 7. The image forming apparatus 3 maintains the lowest power state when no one is in the detectable area 200 (see Figure 8). However, if the motion sensor 100 detects that a person has entered the distance area 201 from outside the detectable area 200 (YES in step 301), the image forming apparatus 3 transitions from the lowest power state to the low power state (step 302). Conversely, if the motion sensor 100 detects nothing (NO in step 301), the image forming apparatus 3 repeats the decision process in step 301.

[0080] The image forming apparatus 3 sets a third distance, which is defined as the region connecting the location where the person was detected and the image forming apparatus 3 (step 303). Specifically, the image forming apparatus 3 sets the distance d3, which is the third distance (see Figure 12). When the detection distance of the person detected in step 301 becomes less than or equal to the third distance (YES in step 304), the image forming apparatus 3 determines that a person has entered the distance region 203 and returns to operation by transitioning from a low-power state to a standby state (step 305). This completes the process (END). On the other hand, if the detection distance exceeds the third distance (NO in step 304), the image forming apparatus 3 proceeds to the decision process in step 306.

[0081] If the detection distance of the person detected in step 301 is between the first distance and the third distance (YES in step 306), the image forming apparatus 3 determines that the person is staying in the distance region 201. In the example of Figure 12 above, if the detection distance is between distance d1 and distance d3, it is determined that the person 500 is staying in the distance region 201. In this case, the image forming apparatus 3 returns to the decision process in step 304.

[0082] In contrast, if the detection distance of the person detected by the motion sensor 100 in step 301 is not between the first distance and the third distance (NO in step 306), the image forming apparatus 3 determines that the person has left the detectable area 200. In the example of Figure 12 above, if the detection distance is not between distance d1 and distance d3, the image forming apparatus 3 determines that the person 500 has left the detectable area 200. In this case, the image forming apparatus 3 returns to the determination process in step 301.

[0083] <Other Embodiments> Although this embodiment has been described above, the present invention is not limited to the first or second embodiment described above. Furthermore, the effects of the present invention are not limited to those described in the embodiments described above. For example, the overall configuration of the image forming system 1 shown in Figure 1, the hardware configuration of the image forming apparatus 2 shown in Figure 2, and the respective functional configurations of the image forming apparatuses 2 and 3 shown in Figures 5 and 7 are merely examples for achieving the objectives of the present invention and are not particularly limiting. In other words, it is sufficient that the image forming system 1 in Figure 1 has the functionality to execute the above-described process as a whole, and the hardware configuration and functional configuration used to realize this functionality are not limited to the examples described above.

[0084] Furthermore, the order of the processing steps in the image forming apparatus 2 or 3 shown in the flowcharts of Figures 6, 16, and 17 is merely illustrative and not particularly limiting. Processing is not limited to being carried out chronologically according to the illustrated step order; it may also be carried out in parallel or individually. Also, the specific examples shown in Figures 3, 8 to 15 are merely examples and not particularly limiting.

[0085] For example, in the above-described embodiment, the motion sensor 100 is built into the image forming apparatus 2 and 3, but a configuration in which the motion sensor 100 is installed separately from the image forming apparatus 2 and 3 can also be adopted. For example, it can be installed around the apparatus or on the ceiling of the room. Furthermore, a configuration can be adopted in which the signal from the motion sensor 100 is output within a 360° range. This makes it possible to efficiently reset the apparatus regardless of the direction from which a person approaches.

[0086] Furthermore, while the above-described embodiments used image forming apparatuses 2 and 3 as examples of devices that change power states in stages, the invention is not limited to these. For example, it can be applied to various devices such as lighting equipment, air conditioning equipment, signage, and robots, as these devices can have multiple power states set. In addition, various modifications and substitutions of configurations that do not depart from the technical concept of the present invention are included in the present invention.

[0087] (Note) (((1))) An image forming system equipped with a processor, The aforementioned processor, When a person is detected by a human presence sensor at a distance of a certain magnitude or less from the image forming apparatus, the image forming apparatus, which is in a first power state, is restored to a second power state with a higher power state than the first power state. When the motion sensor detects a person at a distance shorter than the first distance from the image forming apparatus (a second distance or less), the image forming apparatus is restored to a third power state, which is higher than the second power state. An image forming system characterized by the following. (((2))) When the motion sensor detects a person at a distance less than or equal to the first distance, the processor, in a specific area which is the area connecting the location where the person was detected and the image forming apparatus within the detection area which is the area in which the motion sensor can detect a person, restores the image forming apparatus to the third power state when it detects a person at a distance less than or equal to the third distance which is longer than the second distance from the image forming apparatus. The image forming system described in (((1))) is characterized by the following. (((3))) The third distance is shorter than the first distance. The image forming system described in (((2))) is characterized by the following. (((4))) The processor, with respect to an adjacent region adjacent to the specific region, restores the image forming apparatus to the third power state when it detects a person at a fourth distance or less, where the distance from the image forming apparatus is longer than the second distance. The image forming system according to (((2))) or (((3))), characterized by the above. (((5))) The fourth distance is shorter than the third distance. The image forming system described in (((4))) is characterized by the following. (((6))) The processor, based on predetermined conditions, stops restoring the image forming apparatus to the third power state when it detects a person at or below the third distance. An image forming system according to any one of (((2))) to (((5))) characterized by the above. (((7))) The processor, when it detects a person at or below the first distance using the human presence sensor, sets the second distance using a predetermined coefficient for the distance from the image forming apparatus to the location where the person was detected. An image forming system according to any one of (((1))) to (((6))) characterized by the above. (((8))) The processor divides the detection area, which is the area in which the human presence sensor can detect a person, into a plurality of radial areas centered on the image forming apparatus. In any of the divided regions, when the motion sensor detects a person at a distance less than or equal to the first distance, the divided region including the location where the person was detected is restored to the third power state when a person is detected at a distance less than or equal to the third distance, which is longer than the second distance from the image forming apparatus. An image forming system according to any one of (((1))) to (((7))) characterized by the above. (((9))) The processor, with respect to an adjacent divided region adjacent to the divided region containing the location where a person was detected, restores the image forming apparatus to the third power state when a person is detected at a fourth distance or less, where the distance from the image forming apparatus is longer than the second distance. The image forming system described in (((8))) is characterized by the following. (((10))) The fourth distance is shorter than the third distance. The image forming system described in (((9))) is characterized by the following. (((11))) The processor, based on predetermined conditions, stops restoring the image forming apparatus to the third power state when it detects a person at or below the third distance in the divided region. The image forming system described in (((8))) is characterized by the following. (((12))) The predetermined condition is that the number of divided regions that cause the image forming apparatus to return to the third power state when a person is detected at or below the third distance exceeds a predetermined number. The image forming system described in (((11))) is characterized by the following. (((13))) The processor divides the area where the human presence sensor detects a person into multiple radial regions centered on the image forming apparatus. When a person is detected in any of the divided regions at or below the first distance, the second distance in that divided region is set using a predetermined coefficient for the distance from the image forming apparatus to the location where the person was detected. An image forming system according to any one of (((1))) to (((12))) characterized by the above. (((14))) The processor releases the second distance set in the divided region based on predetermined conditions. The image forming system described in (((13))) is characterized by the following.

[0088] According to the image forming system described in (((1))), it is possible to improve energy efficiency while ensuring convenience for the people who will use the device. According to the image forming system described in (((2))), when a person is detected in the first region, it is possible to detect the approach of a person who is likely to use the device at an earlier timing compared to a configuration in which a person is detected at a second distance in a specific region connecting the place where the person was detected and the image forming device. According to the image forming system described in (((3))), when a person is detected in the first region, it is possible to detect the approach of a person who is likely to use the device at an earlier timing compared to a configuration in which a person is detected at a second distance in a specific region connecting the place where the person was detected and the image forming device. The image forming system described in (((4))) can respond more flexibly to the movements of a person who will use the device, compared to a configuration in which a person is not detected at a second distance in an adjacent region adjacent to a specific region when a person is detected in the first region. The image forming system described in (((5))) can respond more flexibly to the movements of a person who will be using the device, compared to a configuration in which a person is not detected at a second distance in an adjacent region adjacent to a specific region when a person is detected in the first region. According to the image forming system described in (((6))), energy efficiency can be improved compared to the case where the state of unconditionally continuing to return to the third power state when a person is detected at a distance of third or less. According to the image forming system described in (((7))), it becomes possible to set the second distance according to the user's usage, compared to not specifying a coefficient for calculating the second distance. According to the image forming system described in (((8))), the second distance and the third distance can be set for each divided region, allowing for detailed settings according to the user's usage. According to the image forming system described in (((9))), when a person is detected in the first region, it is possible to respond more flexibly to the movements of the person who will be using the device compared to a configuration in which a person is not detected at a second distance in an adjacent region adjacent to the specific divided region. According to the image forming system described in (((10))), when a person is detected in the first region, it is possible to respond more flexibly to the movements of the person who will be using the device compared to a configuration in which a person is not detected at a second distance in an adjacent region adjacent to the specific divided region. According to the image forming system described in (((11))), energy efficiency can be improved compared to the case where the state of unconditionally continuing to return to the third power state when a person is detected at a distance of third distance or less is maintained. According to the image forming system described in (((12))), energy efficiency can be improved compared to the case where the state of unconditionally continuing to return to the third power state when a person is detected at a distance of third distance or less is maintained. According to the image forming system described in (((13))), it becomes possible to set the second distance according to the user's usage, compared to not defining a coefficient for calculating the second distance. According to the image forming system described in (((14))), energy efficiency can be improved compared to the case where the state of unconditionally continuing to return to the third power state when a person is detected at a distance of third distance or less is maintained. [Explanation of Symbols]

[0089] 1…Image forming system, 2…Image forming apparatus, 10…Control unit, 11…CPU, 20…Storage unit, 30…Operation unit, 40…Display unit, 50…Image reading unit, 60…Image forming unit, 70…Communication unit, 100…Human presence sensor, 111…Acquisition unit, 112…Management unit, 113…Determination unit, 114…Power state control unit, 115…Setting unit, 200…Detectable area, 201, 202, 203…Distance area

Claims

1. An image forming system equipped with a processor, The aforementioned processor, When a person is detected by a human presence sensor at a distance of a first degree or less from the image forming apparatus, the image forming apparatus, which is in a first power state, is restored to a second power state with a higher power state than the first power state. When the motion sensor detects a person at a distance shorter than the first distance from the image forming apparatus (a second distance or less), the image forming apparatus is restored to a third power state, which is higher than the second power state. An image forming system characterized by the following.

2. When the motion sensor detects a person at a distance less than or equal to the first distance, the processor, in a specific area which is the area connecting the location where the person was detected and the image forming apparatus within the detection area which is the area in which the motion sensor can detect a person, restores the image forming apparatus to the third power state when it detects a person at a distance less than or equal to the third distance which is longer than the second distance from the image forming apparatus. The image forming system according to claim 1, characterized by the following:

3. The third distance is shorter than the first distance. The image forming system according to claim 2, characterized by the above.

4. The processor, with respect to an adjacent region adjacent to the specific region, restores the image forming apparatus to the third power state when it detects a person at a fourth distance or less, which is longer than the second distance from the image forming apparatus. The image forming system according to claim 2, characterized by the above.

5. The fourth distance is shorter than the third distance. The image forming system according to claim 4, characterized by the above.

6. The processor, based on predetermined conditions, stops restoring the image forming apparatus to the third power state when it detects a person at or below the third distance. The image forming system according to claim 2, characterized by the above.

7. The processor, when it detects a person at or below the first distance using the human presence sensor, sets the second distance using a predetermined coefficient for the distance from the image forming apparatus to the location where the person was detected. The image forming system according to claim 1, characterized by the following:

8. The processor divides the detection area, which is the area in which the human presence sensor can detect a person, into a plurality of radial areas centered on the image forming apparatus. In any of the divided regions, when the human presence sensor detects a person at a distance less than or equal to the first distance, the divided region including the location where the person was detected is restored to the third power state when a person is detected at a distance less than or equal to the third distance, which is longer than the second distance from the image forming apparatus. The image forming system according to claim 1, characterized by the following:

9. The processor, with respect to an adjacent divided region adjacent to the divided region containing the location where a person was detected, restores the image forming apparatus to the third power state when a person is detected at a fourth distance or less, where the distance from the image forming apparatus is longer than the second distance. The image forming system according to claim 8, characterized by the following:

10. The fourth distance is shorter than the third distance. The image forming system according to claim 9, characterized by the following:

11. The processor, based on predetermined conditions, stops restoring the image forming apparatus to the third power state when it detects a person at or below the third distance in the divided region. The image forming system according to claim 8, characterized by the following:

12. The predetermined condition is that the number of divided regions that cause the image forming apparatus to return to the third power state when a person is detected at or below the third distance exceeds a predetermined number. The image forming system according to claim 11, characterized by the following:

13. The processor divides the area where the human presence sensor detects a person into multiple radial regions centered on the image forming apparatus. When a person is detected in any of the divided regions at or below the first distance, the second distance in that divided region is set using a predetermined coefficient for the distance from the image forming apparatus to the location where the person was detected. The image forming system according to claim 1, characterized by the following:

14. The processor releases the second distance set in the divided region based on predetermined conditions. The image forming system according to claim 13, characterized by the following:

Images