Image forming system, control method and program

Abstract

To provide an image forming system in which a first configured device can shift from a second mode with low power consumption to a first mode when a user of the first configured device is present, and in which a second configured device can shift from the second mode to the first mode when a user of the second configured device is present.SOLUTION: The image forming system includes a first transition unit capable of shifting a first configured device from a second mode to a first mode when it is determined that a user of the first configured device is present, and a second transition unit capable of shifting a second configured device from the second mode to the first mode when it is determined that a user of the second configured device is present. The second configured device is configured to be able to maintain the first configured device in the second mode when the second configured device shifts from the second mode to the first mode.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to an image forming system, an image forming apparatus, a control method, and a program. [Background technology]

[0002] Conventionally, image forming devices have been proposed that can switch between a first mode and a second mode (e.g., a power saving mode) that consumes less power than the first mode. In addition, in the image forming devices described above, there have been cases where a technology has been adopted that determines whether a user is present, and switches from the second mode to the first mode when it is determined that a user is present (e.g., Patent Document 1). Summary of the Invention [Problem to be solved by the invention]

[0003] Conventionally, an image forming system including the above-mentioned image forming apparatus as a component device has been proposed. In the above-mentioned image forming system, a user may use either a first component device or a second component device among the component devices. Therefore, a configuration in which the first component device can be shifted from the second mode to the first mode when a user of the first component device is present, and the second component device can be shifted from the second mode to the first mode when a user of the second component device is present is preferable. In consideration of the above circumstances, the present invention aims to enable the first component device to be shifted from the second mode to the first mode when a user of the first component device is present, and enable the second component device to be shifted from the second mode to the first mode when a user of the second component device is present. [Means for solving the problem]

[0004] In order to solve the above problems, the image forming system of the present invention is an image forming system including an image forming apparatus that forms an image, and a component device including a peripheral device provided together with the image forming apparatus, the component device being capable of switching between a first mode and a second mode that consumes less power than the first mode, Image forming device a first determination unit for determining whether or not a user is present; Peripheral Devices A second determination unit that determines whether or not a user is present; Image forming device If it is determined that there are users, the second mode will be changed to the first mode. Image forming apparatus and peripheral devices A first transition portion capable of transitioning It is determined that the image forming apparatus is not used and the peripheral device If it is determined that there are users of Image forming device and peripheral devices, peripheral devices 2nd mode to 1st mode fart and a second transition portion that is movable. Effect of the Invention

[0005] According to the present invention, in an image forming system, Image forming device If there are users of Image forming device It is possible to switch from the second mode, which has lower power consumption, to the first mode, and Peripheral Devices If there are users of Peripheral Devices can be switched from the second mode to the first mode. [Brief description of the drawings]

[0006] [Figure 1] FIG. 1 is a diagram illustrating an example of a configuration device of an image forming system. [Diagram 2] FIG. 1 is a diagram illustrating a hardware configuration of an MFP, which is an example of an image forming apparatus. [Diagram 3] FIG. 2 is a functional block diagram of the image forming system. [Figure 4] 10 is a flowchart of a process for determining whether the image forming apparatus has returned from the power saving mode. [Diagram 5] 10 is a flowchart of a power saving mode transition determination process of the image forming apparatus. [Figure 6] 13 is a diagram for explaining a detection unit in a second embodiment. FIG. [Figure 7] 10 is a flowchart of a process performed by the image forming apparatus while the image forming apparatus is in a power saving mode. [Figure 8] FIG. 13 is a diagram for explaining a sensor unit in a third embodiment. [Figure 9] 4 is a flowchart of a process in a normal mode of the image forming apparatus. [Figure 10]11 is a flowchart of a pre-recovery process of the image forming apparatus. [Figure 11] 13 is a diagram for explaining the position of a sensor unit in a modified example. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0007] First Embodiment FIG. 1 is a diagram for explaining an example of an image forming system 1 of the present invention. The image forming system 1 of the first embodiment is configured to include an MFP (Multifunction Peripheral Product Printer) 100 and multiple peripheral devices (200, 300). The multiple peripheral devices include peripheral device 200 and peripheral device 300. Each of the above peripheral devices is connected to the MFP 100 so as to be able to communicate with the MFP 100. As the peripheral device 200, for example, a paper feed device that supplies print paper to the MFP 100 is assumed. Also, as the peripheral device 300, for example, a finisher that performs a finishing process (such as binding process) on print paper on which an image has been printed by the MFP 100 is assumed. However, the type and number of peripheral devices are not limited to the above example.

[0008] 1, a sensor S1 is provided in the MFP 100. The sensor S1 is in an ON state when there is a user of the MFP 100, and is in an OFF state when there is no user of the MFP 100. Specifically, when the user is located in an area where the user is expected to be located when using the MFP 100 (for example, an area around the MFP 100 near the front of an operation panel 140 described below), the sensor S1 is in an ON state, and when the user is not located, the sensor S1 is in an OFF state.

[0009] The peripheral device 200 is provided with a sensor S2. The sensor S2 is in an ON state when the user of the peripheral device 200 is present, and is in an OFF state when the user of the peripheral device 200 is not present. Specifically, when the user is present in an area where the user is expected to be present when using the peripheral device 200, the sensor S2 is in an ON state, and when the user is not present, the sensor S2 is in an OFF state. Similarly, the peripheral device 300 is provided with a sensor S3. The sensor S3 is in an ON state when the user of the peripheral device 300 is present, and is in an OFF state when the user of the peripheral device 300 is not present. For example, a pyroelectric sensor is preferably used as each of the above sensors S (1 to 3). However, a sensor other than a pyroelectric sensor may be used as the sensor S.

[0010] For the sake of explanation, the area where the sensor S (1 to 3) is in the ON state when the user is located may be referred to as the "detection area" of the sensor S. Also, the MFP 100, the peripheral device 200, and the peripheral device 300 constituting the image forming system 1 may be collectively referred to as the "constituent devices". As shown in FIG. 1, the constituent devices are provided adjacent to each other in the order of the peripheral device 200, the MFP 100, and the peripheral device 300 from the right when the image forming system 1 is viewed from the front. Specifically, the constituent devices are provided at positions where the detection area of ​​the sensor S of the constituent device does not overlap with the detection area of ​​the sensor S of the other constituent devices. However, the detection area of ​​the sensor S may be configured to partially overlap with the detection area of ​​the other sensor S. It should be noted that devices other than the above-mentioned respective devices may be adopted as the constituent devices.

[0011] Each of the constituent devices of the image forming system 1 can be switched between a normal mode (first mode) in which various operations (printing operation, paper feeding operation, discharge operation, etc.) can be immediately performed, and a power saving mode (second mode) in which power consumption is smaller than that in the normal mode. For example, when a constituent device is in the power saving mode, after switching (returning) to the normal mode, the constituent device can perform various operations.

[0012] Although the details will be described later, each of the component devices can switch between the first mode and the second mode depending on whether or not the component device has a user. Note that multiple types of power saving modes may be provided. For example, multiple types of power saving modes including a first power saving mode and a second power saving mode may be provided. The second power saving mode consumes more power than the first power saving mode, but can perform a greater variety of operations than the first power saving mode. Also, the second power saving mode consumes more power than the first power saving mode, but requires less time to return to the normal mode than the first power saving mode.

[0013] 2 is a diagram showing the hardware configuration of the MFP 100. As shown in FIG. 2, the MFP 100 includes a controller 110, a short-range communication circuit 120, an engine control unit 130, and an operation panel 140.

[0014] The controller 110 includes a CPU 101 which is the main part of the computer, a system memory (MEM-P) 102, a south bridge (SB) 104, an ASIC (Application Specific Integrated Circuit) 105, a local memory (MEM-C) 106 which is a storage unit, an HDD controller 107, an HD 108 which is a storage unit, and a network I / F 150. The NB 103 and the ASIC 105 are connected by an AGP (Accelerated Graphics Port) bus 161.

[0015] The CPU 101 is a control unit that performs overall control of the MFP 100, and includes a north bridge (NB) 103. The NB 103 is a bridge for connecting the CPU 101 with the MEM-P 102, the SB 104, and the AGP bus 161, and includes a memory controller that controls reading and writing to the MEM-P 102, a PCI (Peripheral Component Interconnect) master, and an AGP target.

[0016] The MEM-P102 includes a ROM 102a which is a memory for storing programs and data for implementing the various functions of the controller 110, and a RAM 102b which is used for developing the programs and data, and as a drawing memory during memory printing, etc. The programs stored in the RAM 102b may be provided by being recorded in a computer-readable recording medium such as a CD-ROM, CD-R, or DVD in the form of an installable or executable file.

[0017] The SB 104 is a bridge for connecting the NB 103 with PCI devices and peripheral devices. In Fig. 2, a network I / F 150 and an input / output port (general-purpose port) 160 are exemplified as devices connected to the SB 104. The ASIC 105 is an IC (Integrated Circuit) for image processing purposes having hardware elements for image processing, and functions as a bridge for connecting the AGP bus 161, the PCI bus 162, the HD 108, and the MEM-C 106 to each other.

[0018] The ASIC 105 comprises a PCI target and an AGP master, an arbiter (ARB) which is the core of the ASIC 906, a memory controller which controls the MEM-C 106, a plurality of DMACs (Direct Memory Access Controllers) which rotate image data by hardware logic or the like, and a PCI unit which transfers data between the scanner unit 2 and the printer unit 4 via a PCI bus 162. A USB (Universal Serial Bus) interface or an IEEE1394 (Institute of Electrical and Electronics Engineers 1394) interface may be connected to the ASIC 105.

[0019] The HD 108 is a storage for storing image data, font data used during printing, and forms. The HDD controller 107 controls the reading and writing of data from and to the HD 108 under the control of the CPU 101.

[0020] The MEM-C 106 is a local memory used as a copy image buffer and a code buffer. The AGP bus 161 is a bus interface for a graphics accelerator card proposed to speed up graphic processing, and the graphics accelerator card can be made faster by directly accessing the MEM-P 102 with high throughput.

[0021] The short-distance communication circuit 120 includes a short-distance communication circuit 120a. The short-distance communication circuit 120 is a communication circuit such as NFC or Bluetooth. The engine control unit 130 includes a scanner unit 2 and a printer unit 4. The operation panel 140 includes a panel display unit 140a such as a touch panel that displays current setting values ​​and a selection screen and receives input from an operator, and an operation panel 140b including a numeric keypad that receives setting values ​​for image formation conditions such as density setting conditions and a start key that receives a copy start instruction.

[0022] The controller 110 controls the entire MFP 100, for example, drawing, communication, and input from the operation panel 140. The scanner unit 2 or the printer unit 4 includes an image processing unit that performs error diffusion, gamma conversion, and the like.

[0023] MFP 100 can sequentially switch among the document box function, copy function, printer function, and facsimile function using an application switching key on operation panel 140. When the document box function is selected, the mode becomes document box mode, when the copy function is selected, the mode becomes copy mode, when the printer function is selected, the mode becomes printer mode, and when the facsimile mode is selected, the mode becomes facsimile mode.

[0024] The network I / F 150 is an interface for performing data communication using a communication network. The short-range communication circuit 120 and the network I / F 150 are electrically connected to the ASIC 105 via a PCI bus 162. The sensor S1 is electrically connected to the CPU 101 via an input / output port 160 or the like.

[0025] 3 is a functional block diagram of image forming system 1. For example, MFP 100 functions as image forming device 10 when CPU 101 executes a program. Also, peripheral device 200 functions as first peripheral device 20 when its CPU executes a program, and peripheral device 300 functions as second peripheral device 30 when its CPU executes a program.

[0026] As shown in Fig. 3, the image forming apparatus 10 includes a sensor unit 11, a determination unit 12, and a transition unit 13. For example, the above-mentioned sensor S1 (see Fig. 1) functions as the sensor unit 11. The sensor unit 11 outputs an ON signal when a user of the image forming apparatus 10 (MFP100) is present, and outputs an OFF signal when the user of the image forming apparatus 10 is not present. Specifically, the sensor unit 11 outputs an ON signal when a user is located in the detection area of ​​the above-mentioned sensor S1, and outputs an OFF signal when a user is not located in the detection area. The sensor unit 11 is configured to be able to output each signal (ON signal, OFF signal) in a power saving mode in addition to a normal mode.

[0027] The first peripheral device 20 includes a sensor unit 21. For example, the above-mentioned sensor S2 functions as the sensor unit 21. The sensor unit 21 outputs an ON signal when a user of the first peripheral device 20 (peripheral device 200) is present, and outputs an OFF signal when a user of the first peripheral device 20 is not present. A signal (ON signal, OFF signal) from the first peripheral device 20 is input to the image forming apparatus 10 (second determination unit 12b). The sensor unit 21 is configured to be able to output each signal in a power saving mode in addition to a normal mode.

[0028] The second peripheral device 30 includes a sensor unit 31. For example, the above-mentioned sensor S3 functions as the sensor unit 31. The sensor unit 31 outputs an ON signal when a user of the second peripheral device 30 (peripheral device 300) is present, and outputs an OFF signal when a user of the second peripheral device 30 is not present. Signals (ON signal, OFF signal) from the second peripheral device 30 are input to the image forming device 10 (third determination unit 12c). The sensor unit 31 is configured to be able to output each signal in the power saving mode in addition to the normal mode. In the following, the state of the sensor unit (11, 21, 31) that outputs an ON signal may be referred to as the "ON state", and the state of the sensor unit that outputs an OFF signal may be referred to as the "OFF state".

[0029] The determination unit 12 of the image forming device 10 includes a first determination unit 12a, a second determination unit 12b, and a third determination unit 12c. The first determination unit 12a determines whether or not there is a user of the image forming device 10 (an example of a first component device) among the component devices (10, 20, 30) of the image forming system 1. Specifically, when an ON signal is input from the sensor unit 11 (when the sensor unit 11 is in an ON state), the first determination unit 12a determines that there is a user of the image forming device 10. On the other hand, when an OFF signal is input from the sensor unit 11, the first determination unit 12a determines that there is no user of the image forming device 10.

[0030] The second determination unit 12b determines whether or not a user of the first peripheral device 20 (an example of a second component device) among the component devices exists. Specifically, when an ON signal is input from the first peripheral device 20 (sensor unit 21) (when the sensor unit 21 is in an ON state), the second determination unit 12b determines that a user of the first peripheral device 20 exists. On the other hand, when an OFF signal is input from the sensor unit 21, the second determination unit 12b determines that a user of the first peripheral device 20 does not exist. Note that the second determination unit 12b may be configured to be included in a device other than the image forming device 10. For example, the first peripheral device 20 may be configured to include the second determination unit 12b.

[0031] The third determination unit 12c determines whether or not a user of the second peripheral device 30 among the constituent devices exists. Specifically, when an ON signal is input from the second peripheral device 30 (sensor unit 31) (when the sensor unit 31 is in an ON state), the third determination unit 12c determines that a user of the second peripheral device 30 exists. On the other hand, when an OFF signal is input from the sensor unit 31, the third determination unit 12c determines that a user of the second peripheral device 30 does not exist. Note that the third determination unit 12c may be configured to be included in a device other than the image forming device 10. For example, the second peripheral device 30 may be configured to include the third determination unit 12c.

[0032] The transition unit 13 of the image forming device 10 includes a first transition unit 13a, a second transition unit 13b, and a third transition unit 13c. When it is determined that a user of the image forming device 10 (first component device) is present, the first transition unit 13a can transition the image forming device 10 from the power saving mode (second mode) to the normal mode (first mode). With the above configuration, the image forming device 10 can be returned from the power saving mode to the normal mode before the user actually operates the image forming device 10. Therefore, there is an advantage in that the convenience of the user of the image forming device 10 is improved.

[0033] Furthermore, the first transition unit 13a in the first embodiment can transition the image forming device 10 and the second peripheral device 30 from the power saving mode to the normal mode when it is determined that a user of the image forming device 10 is present. Specifically, the first transition unit 13a can transition all of the image forming device 10, the first peripheral device 20, and the second peripheral device 30 to the normal mode when it is determined that a user of the image forming device 10 is present.

[0034] A user of the image forming device 10 is likely to use the first peripheral device 20 and the second peripheral device 30 when using the image forming device 10. Therefore, when it is determined that a user of the image forming device 10 is present, by shifting the first peripheral device 20 and the second peripheral device 30 in addition to the image forming device 10 to the normal mode, the waiting time until the first peripheral device 20 and the second peripheral device 30 become available is likely to be shortened, and convenience for the user is improved.

[0035] Furthermore, the first transition unit 13a in the first embodiment can transition the image forming device 10 from the normal mode to the power saving mode on the condition that it is determined that there is no user of the image forming device 10 when a predetermined transition trigger is established. In the first embodiment, for example, when none of the constituent devices (10, 20, 30) is operated for a predetermined time (hereinafter referred to as the "transition trigger"), each of the constituent devices (10, 20, 30) including the image forming device 10 transitions to the power saving mode. However, even when the transition trigger is established, if there is a user of the constituent device, the constituent device does not transition to the power saving mode. On the other hand, when the transition trigger is established and there is no user of the constituent device, the constituent device transitions to the power saving mode. The transition trigger can be changed as appropriate.

[0036] A user of the image forming apparatus 10 may carry out other work (for example, checking print contents) before using the image forming apparatus 10 (or by temporarily suspending use). In the above cases, a trigger for switching to the power saving mode may occur. If the image forming apparatus 10 were configured to switch to the power saving mode even when a user is present at the image forming apparatus 10, there would be an inconvenience of a waiting time after the other work is completed before the image forming apparatus 10 switches back to the normal mode from the power saving mode. In this embodiment, when a user is present at the image forming apparatus 10, the image forming apparatus 10 is maintained in the normal mode even if a trigger for switching to the normal mode is generated, which has the advantage of suppressing the above-mentioned inconvenience.

[0037] When it is determined that there is a user of the first peripheral device 20 (second component device), the second transition unit 13b can transition the first peripheral device 20 from the power saving mode (second mode) to the normal mode (first mode). According to the above configuration, the first peripheral device 20 can be returned from the power saving mode to the normal mode before the user actually operates the first peripheral device 20. Therefore, there is an advantage in that the convenience of the user of the first peripheral device 20 is improved.

[0038] When it is determined that the first peripheral device 20 has a user, the second transition unit 13b of the first embodiment can transition the first peripheral device 20 from the power saving mode to the normal mode among the image forming device 10, the first peripheral device 20, and the second peripheral device 30 (the image forming device 10 and the second peripheral device 30 are maintained in the normal mode). On the other hand, as described above, when it is determined that the image forming device 10 has a user, all of the image forming device 10, the first peripheral device 20, and the second peripheral device 30 transition to the normal mode. In the above first embodiment, when it is determined that the image forming device 10 has a user, the device that returns from the power saving mode to the normal mode is different between when it is determined that the image forming device 10 has a user and when it is determined that the first peripheral device 20 has a user. That is, in the first embodiment, it can be said that the device that returns to the normal mode is variable depending on the device that is determined to have a user.

[0039] In the first embodiment described above, for example, compared to a configuration in which all component devices uniformly return to normal mode when it is determined that a user is present in any of the component devices, there is an advantage that component devices that are unlikely to be used can be maintained in power saving mode. Also, compared to a configuration in which only a component device determined to have a user returns to normal mode, there is an advantage that multiple component devices that are likely to be used simultaneously can be switched to normal mode, improving user convenience. However, a configuration in which all component devices return to normal mode even when it is determined that a user is present in any of the component devices may be used.

[0040] When it is determined that the second peripheral device 30 is used by a user, the third transition unit 13c can transition the second peripheral device 30 from the power saving mode to the normal mode. According to the above configuration, the second peripheral device 30 can be returned from the power saving mode to the normal mode before the user actually operates the second peripheral device 30. Therefore, there is an advantage in that the convenience of the user of the second peripheral device 30 is improved.

[0041] Specifically, when it is determined that the second peripheral device 30 is used by a user, the third transition unit 13c can transition the image forming device 10 and the second peripheral device 30 from the power saving mode to the normal mode among the image forming device 10, the first peripheral device 20, and the second peripheral device 30. The type of the component device that is returned to the normal mode by the first transition unit 13a can be changed as appropriate. Similarly, the component device that is returned to the normal mode by the second transition unit 13b and the component device that is returned to the normal mode by the third transition unit 13c can be changed as appropriate.

[0042] 4 is a flowchart of the power saving mode return determination process. The image forming apparatus 10 executes the power saving mode return determination process at a predetermined opportunity (for example, at a predetermined time interval).

[0043] When the power saving mode return determination process is started, the image forming device 10 determines whether the sensor unit 11 of the image forming device 10 is in the ON state (S11). If it is determined that the sensor unit 11 of the image forming device 10 is in the ON state (S11: Yes), the image forming device 10 transitions to the normal mode if it is in the power saving mode (S12). Thereafter, the image forming device 10 transitions the first peripheral device 20 in the power saving mode to the normal mode (S13), transitions the second peripheral device 30 in the power saving mode to the normal mode (S14), and ends the power saving mode return determination process.

[0044] Specifically, in step S13, a signal instructing a return to the normal mode is output from image forming apparatus 10 to first peripheral device 20. Also, in step S14, a signal instructing a return to the normal mode is output from image forming apparatus 10 to second peripheral device 30. When the above signals are input, each peripheral device (20, 30) returns from the power saving mode to the normal mode (the same applies to steps S16 and S19 described below).

[0045] In the above-mentioned step S11, if it is determined that the sensor unit 11 of the image forming device 10 is not in the ON state (S11: No), the image forming device 10 determines whether the sensor unit 21 of the first peripheral device 20 is in the ON state (S15). If it is determined that the sensor unit 21 of the first peripheral device 20 is in the ON state (S15: Yes), the image forming device 10 transitions the first peripheral device 20 from the power saving mode to the normal mode (S16), and ends the power saving mode return determination process.

[0046] In the above-mentioned step S15, if it is determined that the sensor unit 11 of the first peripheral device 20 is not ON (S15: No), the image forming device 10 determines whether the sensor unit 31 of the second peripheral device 30 is ON (S17). If it is determined that the sensor unit 31 of the second peripheral device 30 is ON (S17: Yes), the image forming device 10 transitions to the normal mode if it is in the power saving mode (S18), transitions the second peripheral device 30 in the power saving mode to the normal mode (S19), and ends the power saving mode return determination process. On the other hand, if it is determined that the sensor unit 31 of the second peripheral device 30 is not ON (S17: No), the image forming device 10 ends the power saving mode return determination process without transitioning each component device to the normal mode.

[0047] 5 is a flowchart of the power saving mode transition determination process. When the above-mentioned transition trigger occurs, the image forming apparatus 10 starts the power saving mode transition determination process.

[0048] When the power saving mode transition determination process is started, the image forming apparatus 10 determines whether the sensor unit 11 of the image forming apparatus 10 is in the ON state (S21). If it is determined that the sensor unit 11 is not in the ON state (S21: No), the image forming apparatus 10 executes a preparation process for transitioning to the power saving mode if the image forming apparatus 10 is in the normal mode (S22), and proceeds to step S24. In the above preparation process, for example, a process of saving various data to a predetermined storage device is executed.

[0049] When it is determined that the sensor unit 11 is in the ON state (S21: Yes), the image forming device 10 judges whether the image forming device 10 has not been operated for a predetermined time (S23). When it is determined that the image forming device 10 has not been operated for a predetermined time (S23: Yes), the image forming device 10 executes the preparation process for transitioning to the power saving mode described above, and proceeds to step S24. In the above configuration, even if the sensor unit 11 is in the ON state, if the image forming device 10 has not been operated for a predetermined time, the image forming device 10 can transition to the power saving mode.

[0050] For example, when the sensor unit 11 is ON and the image forming device 10 has not been operated for a predetermined time, it is assumed that the user performs another task on the spot after finishing using the image forming device 10. Here, it is assumed that the image forming device 10 does not transition to the power saving mode even after the user has finished using the image forming device 10 when the sensor unit 11 is ON. In the above configuration, a disadvantage may occur in that it is difficult to reduce the amount of power consumed by the image forming device 10. According to this embodiment, even if the sensor unit 11 is ON, if the image forming device 10 has not been operated for a predetermined time, the image forming device 10 transitions to the power saving mode. Therefore, there is an advantage in that the above-mentioned disadvantages can be suppressed.

[0051] If the image forming device 10 is operated within a predetermined time (S23: No), the image forming device 10 skips the preparation process and proceeds to step S24. In step S24, the image forming device 10 determines whether the sensor unit 21 of the first peripheral device 20 is ON (S24). If it is determined that the sensor unit 21 is not ON (S24: No), the image forming device 10 executes an instruction (preparation) process for switching the first peripheral device 20 to a power saving mode (S25), and proceeds to step S27. In the above instruction process, an instruction to switch to the power saving mode is output to the first peripheral device 20. When the above instruction is input, the first peripheral device 20 executes a process of saving various data to a predetermined storage device, for example.

[0052] When it is determined that the sensor unit 21 is in the ON state (S24: Yes), the image forming apparatus 10 judges whether the first peripheral device 20 has not been operated for a predetermined time (S26). When it is determined that the first peripheral device 20 has not been operated for a predetermined time (S26: Yes), the image forming apparatus 10 executes the above-mentioned step S25 and proceeds to step S27. In the above configuration, even if the sensor unit 21 is in the ON state, if the first peripheral device 20 has not been operated for a predetermined time, the first peripheral device 20 can be shifted to a power saving mode. When the first peripheral device 20 has been operated within the predetermined time (S26: No), the image forming apparatus 10 skips the above-mentioned step S25 and proceeds to step S27.

[0053] In step S27, the image forming apparatus 10 judges whether the sensor unit 31 of the second peripheral device 30 is in the ON state (S27). If it is judged that the sensor unit 31 is not in the ON state (S27: No), the image forming apparatus 10 executes an instruction (preparation) process for switching the second peripheral device 30 to the power saving mode (S28), and proceeds to step S30. In the instruction process described above, an instruction to switch to the power saving mode is output to the second peripheral device 30. When the instruction described above is input, the second peripheral device 30 executes a process of, for example, saving various data to a predetermined storage device.

[0054] When it is determined that the sensor unit 31 is ON (S27: No), the image forming apparatus 10 judges whether the second peripheral device 30 has not been operated for a predetermined time (S29). When it is determined that the second peripheral device 30 has not been operated for a predetermined time (S29: Yes), the image forming apparatus 10 executes the above-mentioned step S28 and proceeds to step S30. In the above configuration, even if the sensor unit 31 is ON, if the second peripheral device 30 has not been operated for a predetermined time, the second peripheral device 30 can be shifted to a power saving mode.

[0055] If the second peripheral device 30 is operated within the predetermined time (S29: No), the image forming device 10 skips the above-mentioned step S28 and proceeds to step S30. In step S30, the image forming device 10 transitions to the power saving mode if it has executed step S22. Also, in step S30, the image forming device 10 transitions the first peripheral device 20 to the power saving mode if it has executed step S25, and transitions the second peripheral device 30 to the power saving mode if it has executed step S28. After executing step S30, the image forming device 10 ends the power saving mode transition determination process.

[0056] The device for executing each of the above processes can be changed as appropriate. Each of the above functions (transition unit, etc.) can be realized by one or more processing circuits. Here, the term "processing circuit" in this specification includes a processor programmed to execute each function by software, such as a processor implemented by an electronic circuit, and devices such as an ASIC (Application Specific Integrated Circuit), a DSP (digital signal processor), an FPGA (field programmable gate array), and a conventional circuit module designed to execute each of the above-described functions.

[0057] <Second embodiment> Other embodiments of the present invention will be described below. In each of the following exemplary embodiments, the elements having the same actions and functions as those of the first embodiment will be designated by the same reference numerals as those in the first embodiment, and detailed descriptions thereof will be omitted as appropriate.

[0058] 6 is a diagram for explaining the detection unit 14 of the second embodiment. As in the first embodiment, the image forming system 1 of the second embodiment includes an image forming apparatus 10, a first peripheral device 20, and a second peripheral device 30. The image forming apparatus 10 also includes a sensor unit 11, determination units 12(a-c), and transition units 13(a-c). Similarly, the first peripheral device 20 includes a sensor unit 21, and the second peripheral device 30 includes a sensor unit 31.

[0059] The image forming apparatus 10 of the second embodiment is configured to include a detection unit 14 and a sensor unit 15 (a, b) in addition to the above components. The detection unit 14 detects the orientation of the user of the image forming apparatus 10. Specifically, the detection unit 14 detects the orientation of the user based on a signal from the sensor unit 15. The sensor unit 15 includes a sensor unit 15a and a sensor unit 15b. The sensor unit 15a and the sensor unit 15b generate a signal that can identify the distance to the user of the image forming apparatus 10, and for example, an ultrasonic sensor can be suitably adopted. The sensor unit 15a and the sensor unit 15b are provided on the surface of the image forming apparatus 10 on the detection area side of the above-mentioned sensor unit 11. Specifically, the sensor unit 15a and the sensor unit 15b are arranged in a substantially straight line in the vertical direction.

[0060] 6, when the image forming apparatus 10 is placed on the floor surface, the sensor unit 15a is provided at a height of Ha centimeters (cm) from the floor surface, and generates a signal that identifies the distance to an object located at a height of Ha (cm). Specifically, the sensor unit 15a is provided at a height that can generate a signal that identifies the distance La from the image forming apparatus 10 to the user's ankle (Ps1). On the other hand, the sensor unit 15b is provided at a height of Hf (cm) from the floor surface, and generates a signal that identifies the distance to an object located at a height of Hf (cm) when the image forming apparatus 10 is placed on the floor surface. Specifically, the sensor unit 15b is provided at a height that can generate a signal that identifies the distance Lf from the image forming apparatus 10 to the user's toes (Ps2).

[0061] 6, it is assumed that the front of the user faces the direction of the image forming device 10. In the above case, the distance La is greater than the distance Lf (La>Lf). On the other hand, when the front of the user does not face the direction of the image forming device 10 (for example, when the user has his / her back to the image forming device 10), the distances La and Lf are approximately equal (La≒Lf). The detection unit 14 determines the orientation of the user of the image forming device 10 depending on whether a determination value D indicating the difference between the distances La and Lf is greater than a threshold value Dh.

[0062] Specifically, when a user is detected by sensor unit 11, detection unit 14 determines distance La from the signal output by sensor unit 15a, and determines distance Lf from the signal output by sensor unit 15b. Furthermore, detection unit 14 calculates a judgment value D by subtracting distance Lf from distance La (La-Lf=D), and determines whether judgment value D is equal to or greater than threshold value Dh. If judgment value D is equal to or greater than threshold value Dh, detection unit 14 determines that the user is facing the direction of image forming device 10. On the other hand, if judgment value D is smaller than threshold value Dh, detection unit 14 determines that the user is not facing the direction of image forming device 10.

[0063] The first transition unit 13a of the second embodiment can transition the image forming device 10 to a normal mode or a power saving mode depending on the detected orientation of the user. Specifically, the first transition unit 13a of the second embodiment can transition the image forming device 10 from the power saving mode to the normal mode when the first determination unit 12a determines that a user is present and the detection unit 14 determines that the user is facing the image forming device 10.

[0064] On the other hand, even if the first determination unit 12a determines that a user is present, if the detection unit 14 determines that the user is not facing the image forming device 10, the first transition unit 13a does not allow the image forming device 10 to transition from the power saving mode to the normal mode. The above configuration has the advantage that even if someone happens to pass near the image forming device 10 (the detection area of ​​the sensor unit 11), a situation in which the mode transitions from the power saving mode to the normal mode is suppressed.

[0065] Furthermore, the first transition unit 13a of the second embodiment can transition the image forming device 10 from the normal mode to the power saving mode when it is detected that the user faces a direction different from the direction of the image forming device 10. The above configuration has the advantage that it is possible to shorten the time it takes for the image forming device 10 to transition to the power saving mode after the user has finished using the device, as compared to a configuration in which the image forming device 10 can transition from the normal mode to the power saving mode on the condition that no operation is performed by the user for a predetermined period of time.

[0066] It should be noted that the sensor unit 15 does not have to be provided on the surface of the image forming apparatus 10. For example, assume a configuration in which the sensor unit 15 is provided inside the image forming apparatus 10 at a distance Wx from the surface. In the above configuration, the actual distance to the users (Ps1, Ps2) can be obtained by subtracting the distance Wx from the distance measured by the sensor unit 15.

[0067] In addition, instead of the orientation of the user detected by the detection unit 14, the image forming device 10 may be configured to transition to the normal mode depending on whether or not a movable part (e.g., a document cover) in the image forming device 10 has been moved. Specifically, the image forming device 10 is provided with a movable part sensor that is turned on when the movable part is moved. In the above configuration, the image forming device 10 may be configured to transition to the normal mode when the sensor unit 15 detects a user and the movable part sensor is in the ON state. When the movable part is moved by a user, it is presumed that the user has the intention to use the image forming device 10. Therefore, even in this modified example, as in the second embodiment, there is an advantage that the inconvenience of transitioning to the normal mode when the sensor unit 11 detects a person who has no intention of using the image forming device 10 is suppressed.

[0068] 7A is a flowchart of the power saving mode continuing process. When the sensor unit 11 detects a user in the power saving mode (when the first determination unit 12a determines that a user is present), the image forming apparatus 10 starts the power saving mode continuing process. Note that the sensor unit 11 of the second embodiment is configured to be able to detect a user even in the power saving mode, similar to the first embodiment.

[0069] When the power saving mode ongoing process is started, the image forming apparatus 10 starts detecting the user's feet (S51). Specifically, the sensor unit 15(a, b) is controlled to be in a non-operating state in the power saving mode before the power saving mode ongoing process is executed. In the above-mentioned step S51, the sensor unit 15 is put into an operating state. In the non-operating state, power consumption is reduced more than in the operating state. Therefore, according to the second embodiment, there is an advantage that power consumption is reduced compared to, for example, a configuration in which the sensor unit 15 is always in an operating state. When the sensor unit 15 transitions to the operating state, it becomes possible to generate signals that identify the above-mentioned distance La and distance Lx (see FIG. 6).

[0070] After putting the sensor unit 15 into an operating state, the image forming apparatus 10 acquires a signal from the sensor unit 15 and identifies the distance La and the distance Lf from the signal (S52). The image forming apparatus 10 also subtracts the distance Lf from the distance La and stores the subtraction result as a determination value D (S53). After that, the image forming apparatus 10 determines whether the user is facing the direction of the image forming apparatus 10 (S54). Specifically, the image forming apparatus 10 determines whether the determination value D calculated in step S53 is equal to or greater than a threshold value Dh.

[0071] If the determination value D is equal to or greater than the threshold Dh, the image forming device 10 determines that the user is facing the image forming device 10 (S54: Yes), executes a process to return from the power saving mode to the normal mode (S55), and ends the power saving mode continuation process. On the other hand, if the determination value D is smaller than the threshold Dh, the image forming device 10 determines that the user is not facing the image forming device 10 (S54: No), executes a process to continue the power saving mode (S56), and ends the power saving mode continuation process.

[0072] 7B is a flowchart of the normal mode process. The image forming apparatus 10 executes the normal mode process at predetermined time intervals in the normal mode, for example.

[0073] When the normal mode process is started, the image forming device 10 starts detecting the user's feet (S61) in the same manner as in step S51 of the power saving mode ongoing process (FIG. 7(a)). After that, in the same manner as in steps S52 to 54 of the power saving mode ongoing process, a signal is acquired from the sensor unit 15 (S62), a determination value D is calculated from the distance La and the distance Lf determined from the signal (S63), and it is determined from the determination value D whether the user is facing the image forming device 10 (S64).

[0074] If it is determined that the user is facing the image forming device 10 (S64: Yes), the image forming device 10 maintains the normal mode and ends the normal mode process. On the other hand, if it is determined that the user is not facing the image forming device 10 (S64: No), the image forming device 10 executes internal maintenance (S65). As an example of internal maintenance, an operation for adjusting the print (image formation) start position in the image forming device 10 is assumed. When the above internal maintenance is being executed, normal operations (printing operations, etc.) cannot be executed temporarily.

[0075] In the second embodiment, internal maintenance is performed while the user is not facing the image forming apparatus 10. That is, internal maintenance is performed during a period when it is highly likely that the user is not using the image forming apparatus 10 temporarily. This has the advantage that it is possible to prevent internal maintenance from being performed while the user is using the image forming apparatus 10, and to prevent the user from having to wait until internal maintenance is completed.

[0076] After performing the internal maintenance, the image forming device 10 judges whether a certain time has passed while the user is not facing the image forming device 10 (S66). If it is judged that a certain time has passed while the user is not facing the image forming device 10 (S66: Yes), the image forming device 10 transitions from the normal mode to the power saving mode (S67) and ends the normal mode process. Now, assume a configuration in which step S66 is omitted. In the above configuration, when the user faces a direction different from the direction of the image forming device 10, the mode immediately transitions to the power saving mode. Therefore, even if the user continues to use the image forming device 10, the inconvenience of transitioning to the power saving mode is likely to occur. The second embodiment has the advantage of suppressing the above inconvenience.

[0077] When it is determined that the state in which the user is not facing the image forming device 10 has not continued for a certain period of time (S66: No), the image forming device 10 returns to the process in step S61 described above and repeatedly executes steps S61 to S66. If the user faces the image forming device 10 during the period in which steps S61 to S66 are repeatedly executed, the result of step S64 is determined to be "Yes," and the normal mode process ends while the device remains in the normal mode.

[0078] In the second embodiment, the sensor unit 15 may be provided in the peripheral device. In the above configuration, when the determination unit (12b, 12c) determines that a user of the peripheral device is present and the user faces the peripheral device, the peripheral device may be configured to return to the normal mode. Also, when the user is not facing the peripheral device, the peripheral device may be configured to transition to a power saving mode. Furthermore, when the user of the peripheral device faces the peripheral device, internal maintenance of the peripheral device may be restricted.

[0079] <Third embodiment> 8(a) to 8(c) are diagrams for explaining the sensor unit 16 in the third embodiment. The image forming apparatus 10 in the third embodiment includes a sensor unit 16 instead of the sensor unit 15 described in the second embodiment. The image forming apparatus 10 in the third embodiment also includes a restriction unit 17 in addition to the configurations described in the first and second embodiments. Although described in detail below, the detection unit 14 detects the orientation of the user by the sensor unit 16. The restriction unit 17 restricts the execution of internal maintenance depending on the orientation of the user that is detected.

[0080] Further, the detection unit 14 of the third embodiment is configured to be able to determine whether the user of the image forming device 10 faces the image forming device 10, whether the user of the image forming device 10 faces the first peripheral device 20, or whether the user of the image forming device 10 faces the first peripheral device 20. For the sake of explanation, the direction of the image forming device 10 from the perspective of the user of the image forming device 10 is referred to as the "Y direction". Also, the direction of the first peripheral device 20 from the perspective of the user of the image forming device 10 is referred to as the "X1 direction". Similarly, the direction of the second peripheral device 30 from the perspective of the user of the image forming device 10 is referred to as the "X2 direction". The Y direction, the X1 direction, and the X2 direction are shown in FIG. 8(a) to FIG. 8(c).

[0081] 8(a) to 8(c) show the image forming apparatus 10 as seen by a user using the image forming apparatus 10. In Fig. 8(a) to 8(c), an area SU on the surface of the image forming apparatus 10 where each sensor unit 16 is provided is excerpted and shown. Also shown are the feet (Ua, Uf) of a user of the image forming apparatus 10. The sensor unit 16 of the third embodiment includes a plurality of (e.g., five) sensor units 16a (i to V) and a plurality of (e.g., five) sensor units 16b (i to V) corresponding to each sensor unit 16a.

[0082] Each sensor unit 16a is provided at approximately equal intervals in the horizontal direction at a position (a position at a height Ha (cm) from the floor surface) where it can detect a part (Ua) above the instep of the user's foot (such as the ankle). Specifically, when the user (part Ua) is located in front of the sensor unit 16a, the sensor unit 16a is in the ON state, and when the user (part Ua) is not located in front of the sensor unit 16a, the sensor unit 16a is in the OFF state.

[0083] Each sensor unit 16b is provided at approximately equal intervals in the horizontal direction at a position (at a height Hf (cm) from the floor) where the sensor unit 16b can detect the part (Uf) below the instep of the user. Moreover, the sensor unit 16b is provided directly below the sensor unit 16a corresponding to the sensor unit 16b. When the user (part Uf) is located in front of the sensor unit 16b, the sensor unit 16b is in the ON state, and when the user (part Uf) is not located in front of the sensor unit 16b, the sensor unit 16b is in the OFF state. The detection unit 14 of the third embodiment detects the orientation of the user according to the combination of the sensor units 16 in the ON state.

[0084] FIG. 8(a) assumes a case where the user faces the X1 direction (the direction of the first peripheral device 20). The user's ankle (part Ua) is located almost directly above the user's heel (the end of part Uf). Therefore, the sensor unit 16b corresponding to (located directly below) the sensor unit 16a that detected the user's ankle (part Ua) detects the user's heel. For example, in the specific example of FIG. 8(a), it is assumed that the sensor unit 16aii detects the user's ankle (part Ua) and the sensor unit 16bii detects the user's heel.

[0085] In addition, the user's toes (the other end of the portion Uf) are located at a position horizontally shifted from the user's heel. For example, in the specific example of FIG. 8(a) in which the user faces the X1 direction, the user's toes are located at a position shifted from the user's heel in the X1 direction. As can be understood from the above explanation, when the user faces the X1 direction, the other sensor unit 16b on the X1 direction side of the sensor unit 16b corresponding to the sensor unit 16a that detected the user's ankle (portion Ua) is in the ON state. When the other sensor unit 16b on the X1 direction side of the sensor unit 16b corresponding to the sensor unit 16a that detected the user's ankle (portion Ua) is in the ON state, the detection unit 14 determines that the user faces the X1 direction.

[0086] FIG. 8(b) is a specific example of a case where the user faces the X2 direction (the direction of the second peripheral device 30). When the user faces the X2 direction, the other sensor units 16b on the X2 direction side of the sensor unit 16b corresponding to the sensor unit 16a that detected the user's ankle (part Ua) are turned on. For example, in the specific example of FIG. 8(b), the sensor units 16bii and 16bi on the X2 direction side of the sensor unit 16biii corresponding to the sensor unit 16aiii that detected the user's ankle (part Ua) are turned on. When the other sensor units 16b on the X2 direction side of the sensor unit 16b corresponding to the sensor unit 16a that detected the user's ankle (part Ua) are turned on, the detection unit 14 determines that the user faces the X2 direction.

[0087] FIG. 8(c) is a specific example of a case where the user faces the Y direction (the direction of the image forming device 10). The image forming device 10 of the third embodiment is configured so that when the user faces the Y direction, the sensor unit 16b corresponding to the sensor unit 16a that detected the user's ankle (part Ua) detects the user (heel or toe), and the other sensor units 16b do not detect the user. For example, in the specific example of FIG. 8(b), the sensor unit 16aiii that detected the user's ankle (part Ua) and the sensor unit 16biii corresponding to the sensor unit 16aiii are in the ON state, and the other sensor units 16 are in the OFF state. However, as a case where the user is detected by the sensor unit 16b corresponding to the sensor unit 16a that detected the user's ankle (part Ua) and the other sensor units 16b do not detect the user, in addition to a case where the user faces the Y direction, a case where the user faces the opposite direction of the Y direction (opposite direction to the direction of the image forming device 10) is assumed.

[0088] Considering the above circumstances, the sensor unit 16 of the third embodiment generates a signal capable of identifying the distance to the user, similar to the sensor unit 15 of the second embodiment. Also, the detection unit 14 of the third embodiment determines whether the user is facing the Y direction or the opposite direction to the Y direction according to the distance identified from the signal of the sensor unit 16, similar to the detection unit 14 of the second embodiment. However, the configuration for detecting the orientation of the user is not limited to the above example. For example, an image of the user may be analyzed to detect the orientation of the user. As a specific example of the above modification, an image authentication technology may be suitably adopted.

[0089] 9A is a flowchart of the normal mode process in the third embodiment. When the normal mode process starts, the image forming apparatus 10 judges whether the user is facing away from the image forming apparatus 10 (whether the user is facing the opposite direction to the Y direction) (S101). When it is judged that the user is not facing away from the image forming apparatus 10 (S101: No), the image forming apparatus 10 continues the normal mode (S102) and ends the normal mode process.

[0090] On the other hand, when it is determined that the user has turned his / her back (S101: Yes), the image forming apparatus 10 judges whether the state in which the user has turned his / her back has continued for a predetermined time (S103). When the duration in which the user has turned his / her back is less than the predetermined time (S103: No), the image forming apparatus 10 returns the process to step S101.

[0091] 9(a), steps S101 and S103 are repeatedly executed until the user no longer has his / her back turned to the image forming apparatus 10 or the state in which the user has his / her back turned to the image forming apparatus 10 continues for a predetermined time. When it is determined that the state in which the user has his / her back turned to the image forming apparatus 10 continues for a predetermined time (S103: Yes), the image forming apparatus 10 transitions to the power saving mode (S104) and ends the normal mode process.

[0092] 9B is a flowchart of the internal maintenance control process. The image forming apparatus 10 executes the internal maintenance control process, for example, at the time when the internal maintenance should normally be executed (for example, immediately after the end of printing).

[0093] When the image forming apparatus 10 starts the internal maintenance control process, it determines whether or not the user is facing the direction of the image forming apparatus 10 (Y direction) (S111). If it is determined that the user is facing the direction of the image forming apparatus 10 (S111: Yes), the image forming apparatus 10 transitions to a restricted state (S112) and proceeds to step S114. In the restricted state, the execution of the above-mentioned internal maintenance is restricted.

[0094] When a user is facing the direction of the image forming apparatus 10, there is a high possibility that the user will immediately use the image forming apparatus 10. Therefore, the configuration of the third embodiment can be said to restrict the execution of internal maintenance when there is a high possibility that the user will immediately use the image forming apparatus 10. Therefore, there is an advantage in that a waiting time until the internal maintenance is completed is unlikely to occur.

[0095] In the above-mentioned step S111, if it is determined that the user is not facing the image forming device 10 (S111: No), the image forming device 10 ends the restricted state (S113) and proceeds to step S114. In step S114, the image forming device 10 determines whether or not it is in the restricted state (S114). If it is not in the restricted state (S114: No), the image forming device 10 performs internal maintenance (S115) and ends the internal maintenance control process. On the other hand, if it is in the restricted state (S114: Yes), the image forming device 10 omits the internal maintenance and ends the internal maintenance control process.

[0096] As described above, in the third embodiment, the restricted state is ended when the user is not facing the direction of the image forming apparatus 10 (Y direction). That is, a configuration is adopted in which the restricted state is ended when the user faces a direction different from the Y direction, including the opposite direction to the Y direction, the X1 direction, and the X2 direction. Instead of the above configuration, a configuration may be adopted in which the restricted state is ended when the user faces the opposite direction to the Y direction, and the restricted state is not ended even if the user faces another direction (including the X1 direction and the X2 direction).

[0097] In the third embodiment, the first peripheral device 20 and the second peripheral device 30 may transition to a power saving mode while the image forming device 10 is in the normal mode. In the above cases, the user of the image forming device 10 may stop using the image forming device 10 and use the first peripheral device 20 or the second peripheral device 30. In the third embodiment, a configuration is adopted that reduces the waiting time of the user in the above cases. The above configuration will be described in detail below.

[0098] 10 is a flowchart of the pre-recovery process. The image forming apparatus 10 executes the pre-recovery process at predetermined time intervals while the image forming apparatus 10 is in use, for example.

[0099] When the pre-return process is started, the image forming apparatus 10 judges whether or not the user is facing the image forming apparatus 10 (S121). If it is judged that the user is facing the image forming apparatus 10 (S121: Yes), the image forming apparatus 10 ends the pre-return process without returning other constituent devices to the normal mode (without executing S123 described below). On the other hand, if it is judged that the user is not facing the image forming apparatus 10 (S121: No), the image forming apparatus 10 judges whether or not the user is facing the X1 direction (the direction of the first peripheral device 20) or the X2 direction (the direction of the first peripheral device 20) (S122).

[0100] If it is determined that the user is not facing the X1 or X2 direction (S122: No), the image forming apparatus 10 ends the pre-return process without returning other constituent devices to normal mode. On the other hand, if it is determined that the user is facing the X1 or X2 direction (S122: Yes), the image forming apparatus 10 returns the device corresponding to the direction in which the user is facing to normal mode (S123). Specifically, if the user is facing the X1 direction, the image forming apparatus 10 returns the first peripheral device 20 to normal mode. Also, if the user is facing the X2 direction, the image forming apparatus 10 returns the second peripheral device 30 to normal mode.

[0101] According to the above configuration, the peripheral device (20, 30) that the user is heading for can be returned to the normal mode in advance. After returning the peripheral device, the image forming device 10 ends the advance return process. In the third embodiment, the sensor unit 16 may be provided in the peripheral device. In the above configuration, the other components of the image forming system 1 may be configured to be able to return to the normal mode in advance depending on the orientation of the user of the peripheral device. Furthermore, when the user of the peripheral device turns his / her back to the peripheral device, the peripheral device may be configured to transition to a power saving mode. Furthermore, when the user of the peripheral device faces the peripheral device, internal maintenance of the peripheral device may be restricted.

[0102] <Modification> The above embodiments can be modified in various ways. Specific modified embodiments are exemplified below. Two or more embodiments selected from the following examples can be appropriately combined.

[0103] In the second embodiment described above, the positions at which the sensor units 15(a, b) are provided may be changed as appropriate. FIG. 11(a) is a diagram for explaining the position of the sensor unit 15 in the modified example. As in the second embodiment described above, the sensor unit 15b is provided at a height Hf (cm) from the floor surface and detects the user's toes (Ps2). On the other hand, the sensor unit 15a is provided at a height higher than Ha (cm) from the floor surface. The measurement direction of the sensor unit 15a is inclined at an angle "θ" (0°<θ<90°) with respect to the horizontal direction. In the example of FIG. 11(a), it is assumed that the part Ps1 (ankle) of the user is detected by the sensor unit 15a.

[0104] In the above modification, the distance Lf determined from the signal generated by the sensor unit 15b indicates the distance from the image forming device 10 to the user's toe (Ps2). On the other hand, the distance La determined from the signal generated by the sensor unit 15a differs from the distance from the image forming device 10 to the user's ankle (Ps1) (hereinafter referred to as "distance Lx"). Therefore, in this modification, a correction process is executed to calculate the distance Lx from the distance La. Specifically, the distance Lx is calculated by multiplying the distance La by cosθ (Lx=La×cosθ). The image forming device 10 detects the orientation of the user using the distance Lf and the distance Lx calculated by the correction process.

[0105] FIG. 11(b) is a diagram for explaining the position of the sensor units 15(a, b) in another modified example. In FIG. 11(b), the direction (Y direction) of the image forming apparatus 10 is indicated by an arrow. In the following, the direction perpendicular to the Y direction may be referred to as the X direction. The X direction is approximately parallel to the horizontal direction. In the above-described second embodiment and the modified example shown in FIG. 11(a), the sensor units 15a and 15b are arranged in a line in the vertical direction. In the modified example in FIG. 11(b), the sensor units 15a and 15b are not arranged in a line in the vertical direction.

[0106] Specifically, the sensor unit 15a of this modified example is provided at a height Ha (cm) from the floor surface, and the sensor unit 15b is provided at a height Hf (cm) from the floor surface (similar to the second embodiment). In addition, the positions in the X direction of the sensor unit 15a and the sensor unit 15b are different. Specifically, as shown in FIG. 11(b), the sensor unit 15a is provided at a position where the measurement direction is shifted from the Y direction by θa. In addition, the sensor unit 15b is provided at a position where the measurement direction is shifted from the Y direction by θb. In the above modified example, the distance from the user's ankle (Ps1) to the image forming device 10 (hereinafter "Lx1") is different from the distance La determined from the signal of the sensor unit 15a. In addition, the distance from the user's toe (Ps2) to the image forming device 10 (hereinafter "Lx2") is different from the distance Lf determined from the signal of the sensor unit 15b.

[0107] Therefore, in this modified example, a correction process is performed to calculate the distance Lx1 from the distance La. Specifically, the distance Lx1 is calculated by multiplying the distance La by cosθa (Lx1=La×cosθa). In addition, in this modified example, a correction process is performed to calculate the distance Lx2 from the distance Lf. Specifically, the distance Lx2 is calculated by multiplying the distance Lf by cosθb (Lx2=Lb×cosθb). The image forming device 10 detects the orientation of the user using the distances Lx1 and Lx2 calculated in the correction process. Note that the modified example of FIG. 11(a) or the modified example of FIG. 11(b) may be adopted for the position of the sensor unit 15 in the peripheral device (20, 30).

[0108] <Summary of the functions and effects of the embodiment> <First aspect> The image forming system (1) of this embodiment is an image forming system equipped with component devices (10, 20, 30) including an image forming device (10) that forms an image, and peripheral devices (20, 30) that are provided together with the image forming device, and the component devices are capable of switching between a first mode (normal mode) and a second mode (power saving mode) that consumes less power than the first mode, and are equipped with a first judgment unit (12a) that judges whether or not a first component device (image forming device 10) among the component devices has a user, a second judgment unit (12b) that judges whether or not a second component device (first peripheral device 20) among the component devices has a user, a first transition unit (13a) that can transition the first component device from the second mode to the first mode when it is determined that a user of the first component device has a user, and a second transition unit (13b) that can transition the second component device from the second mode to the first mode when it is determined that a user of the second component device has a user. According to this aspect, in an image forming system, when a user of a first component device is present, the first component device can transition from a second mode, which has lower power consumption, to the first mode, and when a user of the second component device is present, the second component device can transition from the second mode to the first mode.

[0109] <Second aspect> The image forming system (1) of this embodiment includes a detection unit (14) that detects the orientation of the user, and the first transition unit can transition the first component device to the first mode or the second mode depending on the detected orientation of the user. According to this embodiment, there is an advantage that the period of the second mode is longer and power consumption can be easily suppressed, compared to a configuration in which the first component device transitions to the second mode only when a predetermined time has passed.

[0110] <Third aspect> In the image forming system (1) of this embodiment, the first transition unit can transition both the first component device and the second component device from the second mode to the first mode when it is determined that the first component device is used by a user (see S11 to S13 in FIG. 4), and the second transition unit can transition the second component device, of the first component device and the second component device, from the second mode to the first mode when it is determined that the second component device is used by a user (see S15 and S16 in FIG. 4). According to this embodiment, since the second component device transitions to the first mode while the first component device is in use, there is an advantage that a situation where the second component device has to wait for the transition to the first mode is unlikely to occur. In addition, since the first component device can be maintained in the second mode while the second component device is in use, there is also an advantage that power consumption can be reduced.

[0111] <Fourth aspect> In the image forming system (1) of this embodiment, the first transition unit can transition the first component device from the first mode to the second mode when a predetermined transition opportunity is met, on condition that it is determined that there is no user of the first component device (see FIG. 5). According to this embodiment, the inconvenience of the first component device transitioning to the second mode even if there is a user is suppressed.

[0112] <Fifth aspect> In the image forming system (1) of this embodiment, the first transition unit can transition the first component device from the first mode to the second mode when it is detected that the user faces a direction different from the direction of the first component device. According to this embodiment, there is an advantage that the period of the second mode is longer and power consumption can be easily suppressed, compared to a configuration in which the first component device transitions to the second mode only when a predetermined time has passed.

[0113] <Sixth aspect> In the image forming system (1) of this embodiment, the first component device can be shifted to a state (restricted state) in which predetermined maintenance is performed, and includes a restricting unit (17) that restricts the shift to the state in which maintenance is performed when it is detected that the user is facing the first component device. This embodiment has the advantage that waiting time until maintenance is completed is reduced.

[0114] <Seventh aspect> In the image forming system (1) of this embodiment, the second transition unit can transition the second component device from the second mode to the first mode when it is detected that the user of the first component device is facing the direction of the second component device. According to this embodiment, since the second component device transitions to the first mode in advance, there is an advantage that the waiting time for the second component device to transition to the first mode is reduced.

[0115] <Eighth aspect> The image forming device (10) of this embodiment constitutes the image forming system (1) and is an image forming device that forms an image, and includes a first determination unit that determines whether or not a first component device among the components of the image forming system has a user, a second determination unit that determines whether or not a second component device other than the first component device has a user, a first transition unit that can transition the first component device from a second mode that consumes less power than the first mode to the first mode when it is determined that the first component device has a user, and a second transition unit that can transition the second component device from the second mode to the first mode when it is determined that the second component device has a user, and the second transition unit can maintain the first component device in the second mode when the second component device transitions from the second mode to the first mode. According to this embodiment, the same effect as the first embodiment described above can be achieved.

[0116] <Ninth aspect> The control method of the image forming system of this aspect is a control method of the image forming system having components including an image forming apparatus that forms an image and a peripheral device provided together with the image forming apparatus, and causes a computer to execute a step of determining whether or not a user of a first component apparatus among the components is present (S11 in FIG. 4), a step of determining whether or not a user of a second component apparatus other than the first component apparatus is present among the components (S15 in FIG. 4), a step of enabling the first component apparatus to transition from a second mode that consumes less power than the first mode to the first mode when it is determined that a user of the first component apparatus is present (S12 in FIG. 4), and a step of enabling the second component apparatus to transition from the second mode to the first mode when it is determined that a user of the second component apparatus is present (S16 in FIG. 4), and when it is determined that a user of the second component apparatus is present and the second component apparatus transitions from the second mode to the first mode, the control method of the image forming system is capable of maintaining the first component apparatus in the second mode. According to this aspect, the same effect as that of the first aspect described above can be achieved.

[0117] <Tenth aspect> The program of this aspect is a program for causing a computer to execute each step recited in claim 9. According to this aspect, the same effects as those of the first aspect described above can be achieved. [Explanation of symbols]

[0118] 1...image forming system, 10...image forming device, 11...sensor section, 12...judgment section, 13...transition section, 14...detection section, 15...sensor section, 16...sensor section, 17...restriction section, 20...first peripheral device, 21...sensor section, 30...second peripheral device, 31...sensor section. [Prior art documents] [Patent documents]

[0119] [Patent Document 1] Patent No. 6044113

Claims

1. An image forming system including an image forming apparatus that forms an image, and a component device including a peripheral device provided together with the image forming apparatus, The component device is capable of switching between a first mode and a second mode consuming less power than the first mode; a first determination unit that determines whether or not a user of the image forming apparatus is present among the component apparatuses; a second determination unit that determines whether or not a user of the peripheral device among the component devices is present; a first transition unit capable of transitioning the image forming apparatus and the peripheral device from the second mode to the first mode when it is determined that a user of the image forming apparatus is present; a second transition unit capable of transitioning the peripheral device out of the image forming device and the peripheral device from the second mode to the first mode when it is determined that there is no user of the image forming device and when it is determined that there is a user of the peripheral device; An image forming system comprising:

2. A detection unit is provided for detecting the orientation of a user, The first transition unit is capable of transitioning the image forming apparatus to the first mode or the second mode depending on the detected orientation of the user. The image forming system according to claim 1 .

3. The first transition unit is capable of transitioning the image forming apparatus from the first mode to the second mode on condition that it is determined that there is no user of the image forming apparatus when a predetermined transition trigger is established.

3. The image forming system according to claim 1 or 2.

4. The first transition unit is capable of transitioning the image forming apparatus from the first mode to the second mode when it is detected that the user faces a direction different from a direction of the image forming apparatus. The image forming system according to claim 2 .

5. the image forming apparatus is capable of transitioning to a state in which predetermined maintenance is performed; a restriction unit that restricts a transition to a state in which the maintenance is performed when it is detected that the user is facing the image forming apparatus; 5. The image forming system according to claim 2, further comprising:

6. The second transition unit is capable of transitioning the peripheral device from the second mode to the first mode when it is detected that a user of the image forming apparatus is facing the peripheral device.

6. The image forming system according to claim 1.

7. A method for controlling an image forming system including an image forming apparatus that forms an image and a component device including a peripheral device provided together with the image forming apparatus, comprising: The component device is capable of switching between a first mode and a second mode consuming less power than the first mode; determining whether or not a user of the image forming apparatus among the component apparatuses is present; determining whether or not a user of the peripheral device among the component devices exists; a step of shifting the image forming apparatus and the peripheral device from the second mode to the first mode when it is determined that a user of the image forming apparatus is present; a step of shifting the peripheral device out of the image forming device and the peripheral device from the second mode to the first mode when it is determined that there is no user of the image forming device and that there is a user of the peripheral device; A control method for an image forming system comprising the steps of:

8. A program that causes a computer to execute each step described in claim 7.

Images