JP2013230688A - Image forming apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce an erroneous detection of a user who does not use an image forming apparatus by determining sensitivity of a detection means based on an operation history of an operation means and a detection history of a detection means.SOLUTION: An image forming apparatus operating in a first electric power state and in a second electric power state that is more energy-saving than the first electric power state includes: a detection means for detecting an object; an operation means for receiving operation by a user; a power supply control means for transferring the image forming apparatus from the second electric power state into the first electric power state when the detection means detects the object and the operation means is operated; and a determination means for determining sensitivity of the detection means based on an operation history by the operation means and a detection history by the detection means.

Description

  The present invention relates to an image forming apparatus having a human body detection function.

  2. Description of the Related Art Conventionally, there is an image processing apparatus that includes a human body detection sensor and performs a return from the power saving mode based on a detection result of the human body detection sensor. If the human body detection sensor erroneously detects, there is a problem that the power is restored from the power saving mode even though the image processing apparatus is not used, and wasteful power is consumed. As a prior art for solving such a problem, there is one in which the directivity of a human body detection sensor is configured to be variable (see, for example, Patent Document 1).

JP 07-114308 A

However, in Patent Document 1, in order to variably configure the directivity of the sensor, an additional configuration that can mechanically change the direction of the sensor is required, which increases the cost of the apparatus. In addition, since the user has to adjust the direction of the sensor, it is troublesome and may cause incorrect adjustment. If an incorrect adjustment is made, the human body cannot be detected properly, and this causes a problem that the device erroneously returns from the power saving mode.
The present invention has been made in view of the above-described problems, and an object of the present invention is to provide an image forming apparatus that can reduce false detection of a user who does not use the image forming apparatus.

  In order to solve the above-described problems, an image forming apparatus according to the present invention is an image forming apparatus that operates in a first power state and a second power state in which power is saved from the first power state, and a detection unit that detects an object. And an operation unit that receives a user operation, and the image forming apparatus is shifted from the second power state to the first power state when the detection unit detects an object or when the operation unit is operated. Power control means; and determination means for determining sensitivity of the detection means based on an operation history of the operation means and a detection history of the detection means.

  According to the present invention, the sensitivity of the detection unit can be determined based on the operation history of the operation unit and the detection history of the detection unit.

2 is a diagram illustrating an example of an appearance of an MFP. FIG. 2 is a block diagram illustrating an example of a hardware configuration inside an MFP. FIG. 3 is a block diagram illustrating an example of a hardware configuration in a control unit 303. FIG. 3 is a block diagram illustrating an example of a hardware configuration of an operation unit 204. FIG. It is the schematic which showed the operation principle of the electrostatic capacitance type human body detection sensor in this embodiment. 3 is a block diagram illustrating an example of a hardware configuration of a human body detection unit 510. FIG. FIG. 6 is a diagram illustrating an example of a movement trajectory of a user approaching to use (operate) an MFP. 8 is a graph showing a relationship between detection intensity and time, which is a detection output from the capacitance detection circuit in the case of FIG. 7, and whether or not a user operates the operation unit. 5 is a diagram illustrating an example of a movement locus when a person passes in front of an MFP 101. FIG. 10 is a graph showing a relationship between detection intensity from the capacitance detection circuit and time in the case of FIG. 9. 6 is a flowchart illustrating an example of a process for determining a human body detection threshold in the MFP. It is a figure which shows an example of the table A in this embodiment. It is a figure which shows an example of the table B in this embodiment.

Example 1
The best mode for carrying out the present invention will be described below with reference to the drawings.

<Appearance of MFP>
FIG. 1 is a diagram illustrating an example of the appearance of a multi-function image processing apparatus (MFP: Multi Function Peripheral) which is an example of an image processing apparatus.

  The MFP 101 is a composite image forming apparatus having functions such as a copy, a scanner, a FAX, and a printer.

  A document reading unit 202 optically reads a document and generates image data of the document. The paper supply unit 206 is a unit for storing paper, and the user can add paper. The printer unit 205 is a unit that prints an image on a sheet. At the time of printing, a toner image is placed on the sheet conveyed from the sheet feeding unit 206 and fixed using a fixing device. The printed paper is discharged to the paper discharge unit 201. The operation unit 204 is a unit that includes a button for a user to give an instruction to the apparatus, and a display element such as a liquid crystal that displays an apparatus status and an operation menu. Note that the operation unit 204 may be configured by a touch panel. The operation unit 204 receives an operation instruction from the user. The card reader unit 203 is a device that reads information stored in an ID card owned by the user. The card reader unit 203 may have a function of writing data to the card.

  In the present embodiment, it is assumed that a human body detection sensor, which will be described later, is provided in the operation unit 204.

<Hardware configuration of MFP>
FIG. 2 is a block diagram showing an example of the hardware configuration inside the MFP. The plug 301 is inserted into a commercial AC power outlet and supplies AC power to the power supply unit 302. The power supply unit 302 supplies power to each unit in the apparatus. The power supply unit 302 converts the voltage of AC power obtained from the commercial AC power source into a voltage suitable for each unit, and converts AC to DC as necessary depending on the unit to which power is supplied. Inside the power supply unit 302, a fuse 210 and a relay 212 are provided. The fuse 210 protects the power supply unit 302 or each unit of the MFP 101 to which the power supply unit 302 supplies power when an overcurrent or a short-circuit current flows in the power supply unit 302 so that an internal fusible member is melted or cut off. . The relay 212 plays a role of switching for supplying or stopping power supply from the power supply unit 302 to each unit in the MFP 101. Both the fuse 210 and the relay 212 are devices having a lifetime that depends on the number of times the power is turned on. A control unit 303 is a unit that controls each unit in the MFP 101 and controls electronic data processing and transfer. The power supply control signal line 304 is a signal line through which a power supply control signal that is a signal for the control unit 303 to perform control related to On / Off of the output of the power supply unit 302 is transmitted.

  The MFP 101 has a normal operation mode (normal mode) in which power is supplied to each unit constituting the MFP 101, and an energy saving mode (energy saving mode; power saving that reduces power consumption by not supplying power to some units. Mode and sleep mode).

  In the energy saving mode, the MFP 101 according to the present embodiment cuts off the power of the document reading unit 202, the paper discharge unit 201, the printer unit 205, and the paper feed unit 206 in order to reduce power consumption. In addition, power is supplied to only a part of the control unit 303 and the operation unit 204 and the power of other parts is cut off. In the energy saving mode, the place where power is supplied in the control unit 303 is a circuit that detects a trigger for returning from the energy saving mode to the normal mode. The trigger includes detection of insertion of an ID card, detection of FAX reception, detection of a print job received via the network, detection of button operation of the operation unit 204, and the like.

  When the MFP 101 is in the energy saving mode, it is desirable that the operation unit 204 be usable as soon as possible for a user who reads an ID card in order to use the MFP 101 or a user who operates a button of the operation unit 204. However, depending on the software or hardware that controls the operation unit 204, it may take several seconds to several tens of seconds until the operation unit 204 becomes usable. In addition, for example, relays, fuses, HDDs, and the like have a lifetime that depends on the number of times the power is turned on (tens of thousands in a small example). For example, in the case of a relay, it is the life of a contact, and in the case of an HDD, it is a life due to accumulation of mechanical stress on a recording medium or a head. In the case of a fuse, it is the lifetime of a fusible body that deteriorates due to an inrush current that is generated each time the power is turned on. Therefore, there is a limit to the number of times to shift between the energy saving mode and the normal mode. Therefore, it is desirable that the number of transitions be as small as possible. The relay is used inside the power supply unit 302.

<Hardware configuration of control unit>
FIG. 3 is a block diagram illustrating an example of a hardware configuration of the control unit 303.

  The CPU 402 executes processing in the control unit 303. The CPU 402 executes a program loaded in the memory 403.

  An internal bus 405 is a bus for the CPU 402 to communicate with each block in the control unit 303.

  A hard disk (HDD) 409 stores programs executed by the CPU 402 (such as an OS and application programs). The HDD 409 stores job data and image data. The job data refers to data for the MFP to execute a function, such as PDL data for print processing received from the client PCs 102 and 103 via the LAN I / F 407, for example. The HDD 409 is an example of a device having a lifetime that depends on the number of times the power is turned on.

  A reader I / F 404 is an I / F for communicating with the document reading unit 202 to exchange commands / statuses and image data. A printer I / F 410 is an I / F that communicates with the printer unit 205 to exchange commands / status and image data. A FAX I / F 408 is an I / F that is connected to a public telephone line and performs FAX image communication. A LAN I / F 407 is connected to a network such as Ethernet (registered trademark), and exchanges job data and commands / statuses.

  An operation unit I / F 406 is an I / F that communicates with the operation unit 204, and transmits data to be displayed on the display unit 504 and receives input information from a user such as a button or a touch panel. A power control unit 401 is a block that controls the transition of the MFP 101 between the normal mode and the energy saving mode. A power supply control signal transmitted to the power supply unit 302 via the power supply control signal line 304 is transmitted or changed so as to shift from the normal mode to the energy saving mode by a command from the CPU 402. Further, under the energy saving mode, the activation signal transmitted from the operation unit I / F 406, the LAN I / F 407, and the FAX I / F 408 via the activation signal lines (412, 414, 416) is monitored. When there is a change, a power supply control signal is transmitted or changed so as to return from the energy saving mode to the normal mode. The power supply unit 302 supplies / stops power to the units constituting the MFP 101 according to the power control signal.

<Hardware configuration of operation unit>
For the user who uses the MFP, it is desirable that the MFP in the energy saving mode is restored as soon as possible. Accordingly, by providing the MFP with a human body detection sensor, it is detected that the user has approached the MFP, and the normal mode is restored. Thereby, it is possible to obtain an effect of apparently shortening the return time from the energy saving mode. In this embodiment, it is assumed that the operation unit of the MFP includes a human body detection sensor.

  FIG. 4 is a block diagram illustrating an example of a hardware configuration of the operation unit 204. The CPU 503 executes the program using the memory 507 as a work area and controls the entire operation unit 204.

  The memory 507 is configured as a storage unit including a nonvolatile program memory and a rewritable temporary memory. The program memory stores a program executed by the CPU 503. The rewritable temporary memory is used as a work area for the CPU 503.

  The display unit 504 displays data received from the control unit 303 via the host I / F 508 on a liquid crystal (LCD) provided in the display unit 504. The button unit 506 includes a push button or a touch panel sheet superimposed on the LCD of the display unit 504. When the CPU 503 detects an operation (pressing) of the button unit 506, the CPU 503 transmits information indicating that the button has been pressed or which button has been pressed to the control unit 303 via the host I / F 508.

  The card reader unit 203 is connected to the card reader I / F 502. The card reader unit 203 is controlled by the CPU 503 to transmit / receive data to / from a card (such as an ID card) 501.

  Each block in the operation unit 204 is connected to the internal bus 505.

  In the energy saving mode, the CPU 503 does not supply the power supplied from the power supply unit 302 to the operation unit 204 to the display unit 504 in order to reduce power consumption. Alternatively, the liquid crystal backlight of the display unit 504 is controlled to be turned off. In the present embodiment, the processing capacity of the CPU 503 and the memory capacity of the memory 507 are limited to reduce power consumption.

  The human body detection unit 510 and the antenna 512 have a function of performing capacitive human body detection. The human body detection unit 510 detects the approaching and leaving of the user and transmits the result to the control unit 303 via the host I / F 508. Note that power is supplied to the human body detection unit 510 under the energy saving mode.

  In this embodiment, the human body detection unit 510 is provided in the operation unit 201. However, if the configuration is such that the detection of the approaching and leaving of the human body can be transmitted to the control unit 303, the other parts of the MFP 101 are configured. It may be provided in the place. Further, the MFP 101 may include a plurality of human body detection units. In particular, when the MFP 101 is an apparatus such as a large-sized copying machine, the human body detection unit is arranged at a plurality of locations (for example, an operation unit, a paper feed cassette unit, and a paper discharge unit unit) so that the user can It is possible to detect when approaching any part of the.

<Human body detection sensor>
FIG. 5 is a diagram simply showing the operation principle of the capacitance type human body detection sensor in the present embodiment. The electrostatic capacity type human body detection sensor measures the electrostatic capacity Chm (522) between the antenna 512 and the human body 520 mounted on the MFP. The capacitance Chm (522) increases or decreases depending on the distance between the antenna 512 and the human body 520. However, the capacitance that can actually be measured by the antenna 512 is the combined capacitance C of the capacitance Chg (503) between the human body 520 and the ground and Cmg (504) between the MFP 101 and the ground, in addition to Chm. The composite capacity C is defined by Equation 1.

1 / C = 1 / (Chm + Chg) + 1 / Cmg (1)
Since the values of Chg and Cmg vary depending on the environment where the MFP 101 is installed, whether or not the human body 520 is approaching the MFP 101 is evaluated based on a relative value with respect to the base noise level. A feature of electrostatic human body detection is that the distance between the human body 520 and the MFP 101 can be relatively grasped as can be seen from Equation 1. In addition, since the capacitance type human body detection sensor has low power consumption, it is suitable for operating in the energy saving mode.

  FIG. 6 is a diagram illustrating an example of a hardware configuration of the human body detection unit in the present embodiment. The human body detection unit 510 includes a mechanism of the above-described capacitance type human body detection sensor. The capacitance detection circuit 601 includes a CV conversion 607, an A / D conversion 608, and a control unit 609. The CV converter 607 to which the antenna 512 is connected converts the capacitance between the antenna and the ground into a voltage value. The voltage value output from the CV conversion 607 is converted into a digital value by the A / D conversion 608. The control unit 609 controls the CV conversion 607 and the A / D conversion 608 in accordance with commands issued from the CPU 602. The CPU 602 reads the obtained digital value and performs operations such as noise removal and level conversion. The value thus obtained becomes the detection intensity value (detection output) by the human body detection unit 510. The memory 604 includes a nonvolatile program memory and a rewritable temporary memory. Each block in the human body detection unit 510 is connected by an internal bus 603. The buffer 606 is a buffer that connects the internal bus 603 of the human body detection unit 510 and the internal bus 405 of the operation unit 104.

<Operation example of human body detection sensor>
FIG. 7 is a diagram illustrating an example of a movement trajectory of a user approaching to use (operate) the MFP. Th <b> 1 is a determination criterion that serves as a threshold for detecting a human body by the human body detection unit 510. The threshold Th1 can be set by a threshold calculation process described later, but can also be set by the user using the operation unit 204. When set by the user on the operation unit 204, the setting content is transmitted from the control unit 303 to the CPU 602 of the human body detection unit via the operation unit 204. The CPU 602 sets a threshold value Th1 according to the transmitted contents. The output from the capacitance detection circuit 601, that is, the detection intensity by the human body detection sensor is compared with the threshold value Th <b> 1 by the CPU 602. If the detected intensity is stronger than Th1, the CPU 602 determines that a human body has been detected. Information indicating the determination result of detecting the human body is stored in the buffer 606 in the human body detection unit 510 and output to the internal bus 505 of the operation unit 104. If a human is within the circle indicated by Th1, the determination criterion is exceeded, and it is determined that a human body has been detected. Since the capacitance type human body detection sensor has no directivity, the range indicated by Th1 is a circle (or a sphere) unless the influence of the components constituting the MFP 101, other devices, or objects is taken into consideration. Here, the reason why the antenna 512 is arranged on the operation unit 104 is because the operation unit 104 has a return button for the user to switch from the energy saving mode to the normal mode. This is also because the user often operates standing by the operation unit 104 in many cases when using the MFP 101. As long as a user approaching the operation unit 104 can be detected, the human body detection sensor may be installed in another location.

  FIG. 8 is a graph showing an example of a relationship between detection intensity and time, which is a detection output from the capacitance detection circuit in the case of FIG. 7, and whether or not the user operates the operation unit. The detection intensity of the capacitance detection circuit 601 is a digital value output from the A / D conversion 608, and the detection intensity is noise during the period from the origin to T801 in the graph because the user is sufficiently away from the MFP. Is on the level. As the user approaches the MPF, the detection intensity gradually increases from T801, and it is determined that a human body has been detected when Th1 is exceeded (at time T802), that is, the MFP 101 has been operated. At T803, the user actually operates the operation unit 204, and at T804, when the detection intensity becomes smaller than Th1, the MFP 101 determines that the human body is not detected, and determines that the user has left the MFP. Note that the CPU 503 of the operation unit 204 can detect whether or not the operation unit 204 has been operated. Further, the CPU 503 notifies the CPU 402 of the control unit 303 that the operation unit 204 has been operated. The operations of the operation unit 204 include pressing a button or touch panel provided on the operation unit 204, detecting that the card reader unit 203 detects the card 501, setting a document on the reader unit 202, and opening / closing the reader unit (document pressure plate). Operations are included.

  The above is a general operation example of the MFP 101 in which the electrostatic capacity type human body detection unit is mounted. Information indicating that a human body has been detected at time T802 is transmitted from the human body detection unit 510 to the operation unit 204, and further transmitted from the operation unit 204 to the CPU 402 and the power supply control unit 401 via the operation unit I / F 406. In response to the notification transmitted from the operation unit I / F 406, the power control unit 401 starts supplying power to each unit in the MFP 101 in order to shift from the energy saving mode to the normal mode. As a result, the MFP return operation can be started from time T802 before the user presses a button for returning from the energy saving mode to the normal mode (time T803), and convenience to the user can be improved. .

<Determination method of threshold value>
Next, a method for determining a threshold value in the detection intensity of the human body detection sensor in the present embodiment will be described.

  For example, when the MFP 101 is installed in a narrow passage, a person who does not operate the MFP 101 may frequently approach the MFP depending on the installation environment.

  FIG. 9 is a diagram illustrating an example of a movement trajectory when a person passes in front of the MFP 101. When the MFP 101 is in the energy saving mode, when a person passes in front of the MFP 101, the person crosses an area exceeding Th1. Even though this person does not intend to use the MFP 101, the MFP 101 returns from the energy saving mode to the normal mode by the output from the human body detection unit 510 due to passing through the vicinity of the MFP 101. This consumes wasted power and shortens the life of devices (HDD, relay, fuse) that have an upper limit on the number of activations.

  FIG. 10 is a graph showing the relationship between the detection intensity of the electrostatic capacity detection circuit 601 and the time when the user passes in front of the MFP as shown in FIG. Here, when the threshold value for detecting a human body is set as Th1, it is determined that the detection intensity exceeds Th1 at time T1001, and that a human body has been detected, that is, the MFP has been operated. However, after that, there is no operation on the operation unit 204, the detection intensity becomes smaller than Th1 at time T1002, and it is determined that the human body is not detected, and the user determines that the MFP has left. That is, when the threshold value for human body detection is Th1, a person who passes only is erroneously detected, and the MFP 101 returns from the energy saving mode to the normal mode.

  In such a case, the MFP 101 changes the threshold value for detecting the human body to Th1 'having a stronger intensity. As a result, the detection intensity does not exceed Th1 'only when a person passes in front of the MFP 101, so that the human body is not detected and the MFP 101 can remain in the energy saving mode.

  FIG. 11 is a flowchart illustrating an example of processing for determining a threshold value for detecting a human body in the MFP 101.

  In step S1101, the CPU 602 periodically saves the sense value of the capacitance detection circuit 601 as a history in the nonvolatile area of the memory 604 by an internal timer, and creates a sense value table A. For example, a history is taken every second to create a sense value table. In this embodiment, the non-volatile area provided in the memory 604 is used as a history recording area, but a storage device other than the memory 604 may be provided for history recording.

  FIG. 12 is a diagram illustrating an example of the table A. Table A includes items of time and sense value, and records a sense value every second. Table A is an example of a record of detection output history.

  Next, in step S1102, the CPU 602 performs inter-CPU communication with the CPU 503 that controls the operation unit 204, and displays information indicating whether or not the operation unit 204 is operated at the time when the sense value of the capacitance detection circuit 601 is stored. get. Then, table B is created by merging the acquired information with table A.

  FIG. 13A illustrates an example of the table B. In addition to the table A, operation history information that is an item indicating whether or not the operation unit 204 is operated is added. FIG. 13B shows another example of the table B. In (b), the operation unit 204 is operated from 8:10:08 to 8:10:12.

  Next, in step S1103, the CPU 602 refers to the table B and calculates a human body detection threshold Th. As a calculation method, for example, an average value of values stored in the table B is obtained, and a value of 50% is set as the threshold Th. Alternatively, the threshold Th may be calculated using another statistical method. The calculated threshold value is stored in the memory 604.

  In step S1104, the CPU 602 determines whether or not a sense value greater than or equal to the human body detection threshold Th is detected. If a sense value greater than or equal to the threshold Th is detected, the process proceeds to step S1105. On the other hand, if a sense value greater than or equal to the threshold Th is not detected, the process proceeds to step S1110. In step S1105, it is determined that a sense value equal to or greater than the threshold Th has been detected, that is, a human body has been detected, and the determination result is output to the buffer 606. The determination result is transmitted from the buffer 606 to the CPU 503 through the bus 505 of the operation unit 204.

  In step S1106, the CPU 503 determines whether or not the operator has operated the operation unit 204 within a predetermined time (for example, 10 seconds) after receiving the determination result that the human body has been detected from the human body detection unit 510. Determine. If it is determined that there is an operation on the operation unit 204 within a predetermined time, the process returns to step S1104. In this case, the threshold Th for determining that a human body is to be detected is set appropriately, and the MFP 101 operates using the threshold Th set here as a human body detection threshold. On the other hand, if it is determined in step S1106 that there is no operation on the operation unit 204 within a predetermined time, the process proceeds to step S1107.

  In step S1107, the CPU 602 changes the human body detection threshold value Th to a slightly higher level, that is, a threshold value that determines that a human body is not detected unless the detection intensity is higher. In the present embodiment, as an example, the threshold Th is increased by 5%, but the amount of change of the threshold may be other values.

  In step S1108, it is determined whether or not the processing in step S1107, that is, the change in threshold value Th is within a predetermined number of times (for example, within 5 times). If the predetermined number of times has been exceeded, the process proceeds to step S1109; otherwise, the process returns to step S1104.

  In step S1109, the power source of the capacitance detection circuit 601 is turned off.

  The reason why the capacitance detection circuit 601 is turned off in step S1109 is as follows. If the human body detection is a false detection and the process of changing the threshold Th is repeated many times, this means that the human body detection sensor does not function effectively in the current MFP installation environment. For example, in a place where the MFP 101 is installed in a narrow passage, the human body detection sensor cannot distinguish between a person using the MFP 101 and a person passing near the MFP 101. In such an installation environment, whenever a person unrelated to the operation passes in front of the MFP 101, the person returns from the energy saving mode, which not only consumes unnecessary power but also has an upper limit on the number of activations. It is not preferable in terms of the life of the parts. For this reason, in an installation environment where people who are not related to the operation are frequently detected, the power supplied to the capacitance detection circuit 601 is stopped so that human body detection is not performed, and even a small amount of power is consumed. It becomes possible to suppress.

  In step S1109, instead of stopping the power supply to the capacitance detection circuit 601, the MFP 101 may be controlled not to return from the energy saving mode based on the detection result of the capacitance detection circuit 601. . Also, another method that invalidates the detection output from the capacitance detection circuit 601 may be used.

  In step S1108, the process proceeds to step S1109 based on the number of times the threshold is changed. However, instead of the number of times the threshold is changed, the process may proceed to step S1109 when the threshold reaches a predetermined value.

  Note that the processing in steps S1101 to S1103 is processing performed after the MFP 101 is newly installed, and is not necessarily executed when the threshold converges to a certain value. However, since the surrounding environment may be changed after the MFP 101 is installed or the installation position of the MFP 101 may be changed, the process from step S1101 on a regular basis (for example, once a week or once a month). Processing may be started.

  If it is determined in step S1104 that a sense value equal to or greater than the threshold value Th has not been detected, but the operation unit 204 is operated, the threshold value Th is changed to a weaker detection intensity. Also good.

[Other Embodiments]
The present invention supplies a control program for realizing each function of the above-described embodiment directly or remotely to a system or apparatus, and a computer included in the system reads the supplied program code. It is also achieved by executing.

  Accordingly, since the functions and processes of the present invention are implemented by a computer or the above-described apparatus, the program code itself of the control program installed in the computer or the above-described apparatus also implements the present invention. That is, the control program itself for realizing the functions and processes is also one aspect of the present invention.

  In this case, the program may be in any form as long as it has a program function, such as an object code, a program executed by an interpreter, or script data supplied to the OS.

  Examples of the recording medium for supplying the program include a flexible disk, hard disk, optical disk, magneto-optical disk, MO, CD-ROM, CD-R, and CD-RW. Examples of the recording medium include a magnetic tape, a non-volatile memory card, a ROM, a DVD (DVD-ROM, DVD-R), and a USB memory.

  The program may be downloaded from an Internet / intranet website or a file server using a browser of a client computer. That is, the computer program itself of the present invention or a compressed file including an automatic installation function may be downloaded from the website onto a recording medium such as a hard disk. It can also be realized by dividing the program code constituting the program of the present invention into a plurality of files and downloading each file from a different website. That is, a WWW server that allows a plurality of users to download a program file for realizing the functional processing of the present invention on a computer may be a constituent requirement of the present invention.

  Further, the program of the present invention may be encrypted and stored in a storage medium such as a CD-ROM and distributed to users. In this case, only the user who has cleared the predetermined condition is allowed to download the key information to be decrypted from the website via the Internet / intranet, decrypt the program encrypted with the key information, and execute the program. You may install it on

  Further, the functions of the above-described embodiments may be realized by the computer executing the read program. Note that an OS or the like running on the computer may perform part or all of the actual processing based on the instructions of the program. Of course, also in this case, the functions of the above-described embodiments can be realized.

  Furthermore, the program read from the recording medium may be written in a memory provided in a function expansion board inserted into the computer or a function expansion unit connected to the computer. Based on the instructions of the program, a CPU or the like provided in the function expansion board or function expansion unit may perform part or all of the actual processing. In this way, the functions of the above-described embodiments may be realized.

  As described above, by learning from the sense value history of human body detection and the history of operation of the image forming apparatus and appropriately setting the human body detection range, the possibility of returning from the energy saving mode due to erroneous detection is reduced. Also, the person who operates the MFP, which is the original purpose, is detected as soon as possible to improve the convenience for the user.

101 MFP
510 Human Body Detection Unit 512 Antenna 601 Capacitance Detection Circuit

Claims (13)

An image forming apparatus that operates in a first power state and a second power state that saves power than the first power state,
Detection means for detecting an object;
An operation means for accepting a user operation;
A power supply control unit that shifts the image forming apparatus from the second power state to the first power state when the detection unit detects an object or when the operation unit is operated;
An image forming apparatus comprising: a determination unit that determines sensitivity of the detection unit based on an operation history of the operation unit and a detection history of the detection unit.   The image forming apparatus according to claim 1, wherein the determination unit determines a threshold value to be compared with a detection intensity detected by the detection unit.   The image forming apparatus according to claim 1, wherein the threshold is used to determine that the detection unit has detected an object.   The image forming apparatus according to claim 1, wherein the detection history of the detection unit is a history of detection intensity detected by the detection unit.   The image forming apparatus according to claim 1, wherein the operation history of the operation unit is a history of presence / absence of operation of the operation unit.   The power control unit detects that the operation unit is operated in the second power state, and causes the image forming apparatus to shift from the second power state to the first power state. The image forming apparatus according to any one of claims 1 to 5. Reading means for reading an image of a document;
The image forming apparatus according to claim 1, further comprising: an image forming unit that forms an image on a sheet.   The image forming apparatus according to claim 7, wherein power supply to the reading unit and the image forming unit is stopped in the second power state. An image forming apparatus that operates in a first power state and a second power state that saves power than the first power state,
Detection means for detecting an object;
An operation means for accepting a user operation;
Power control means for causing the image forming apparatus to transition from the second power state to the first power state when the detection means detects an object;
After the power control unit shifts the image forming apparatus from the second power state to the first power state, the sensitivity detected by the detection unit is adjusted when the operation unit is not operated until a predetermined time elapses. And an adjusting unit.   The image forming apparatus according to claim 9, wherein the adjustment unit adjusts a threshold value to be compared with a detection intensity detected by the detection unit.   The image forming apparatus according to claim 9, wherein the threshold is used to determine that the detection unit has detected an object. Reading means for reading an image of a document;
The image forming apparatus according to claim 9, further comprising an image forming unit that forms an image on a sheet. The image forming apparatus according to claim 12, wherein in the second power state, power supply to the reading unit and the image forming unit is stopped.

Images