JP6494320B2

JP6494320B2 - Image forming apparatus

Info

Publication number: JP6494320B2
Application number: JP2015035305A
Authority: JP
Inventors: 水山　善雄; 善雄水山
Original assignee: シャープ株式会社
Priority date: 2015-02-25
Filing date: 2015-02-25
Publication date: 2019-04-03
Anticipated expiration: 2035-02-25
Also published as: JP2016155324A

Description

The present invention relates to an image forming apparatus including a human body sensor, and more particularly to an image forming apparatus that returns from a power saving mode in response to a user's detection by the human body sensor.

There is known an image forming apparatus that returns from a power saving mode to a normal mode when a person approaching the apparatus is detected by a human sensor (see, for example, Patent Document 1). Patent Document 1 forms a detection area for detecting the ingress of a person outside the front of the image forming apparatus, and whether or not the human body detection sensor is moving in the approaching direction to the own apparatus. Judging. If it judges that it is moving in the approaching direction, it returns from the power saving mode to the normal mode. This is because it is possible to quickly determine whether a person is moving in the approaching direction of the image forming apparatus and to shorten the waiting time until the image forming apparatus becomes usable.

JP 2014-46650 A

To detect the approach of a person with a sensor and to return from the power saving mode at an early stage, for example, come to a place where an image forming apparatus such as a copy is placed and place a document in a predetermined place or set a job using the operation panel. Keep in mind users who go. The user is a so-called walk-up job. However, a person who picks up a printed sheet printed and output by the image forming apparatus or a person who simply passes in front of the image forming apparatus also enters the detection area. If a user who is not a walk-up job is detected to return from the power saving mode, power is wasted.
The present invention has been made in view of the above circumstances, and provides an image forming apparatus capable of preventing an unnecessary return while returning from the power saving mode in response to the approach of a person. .

The present invention relates to a human sensor that detects a direction of a moving person and a distance to the person, a storage unit that stores a distance and a direction that change with the movement of the detected person as a sensing history, and a user operation Control unit, and control of the transition to the power saving mode and the return from the power saving mode to the normal mode, and a person moves to the place where the operation unit is arranged and the operation unit accepts the operation. And a control unit that stores the detection history related to the operation as distinguishable from the detection history not related to the operation, and the control unit detects when the human sensor detects a person in the power saving mode state. It is checked whether or not a sensing history similar to the change in direction and distance is stored in the storage unit, and if at least one similar sensing history is stored, the operation related to the operation among the similar sensing histories is stored. To provide an image forming apparatus that determines whether to maintain the power saving mode or to return to the normal mode based on but was in proportion.

In the image forming apparatus according to the present invention, when the control unit detects a person in the power saving mode state, the control unit checks whether a sensing history similar to the detected change in direction and distance is stored in the storage unit. When at least one similar sensing history is stored, it is determined whether to return to the normal mode or to maintain the power saving mode based on the proportion of the similar sensing history related to the operation. An unnecessary return can be prevented while returning from the power saving mode in response to the approach.

1 is a block diagram illustrating a configuration of an image forming apparatus according to an embodiment of the present invention. FIG. 2 is an explanatory diagram schematically illustrating how the image forming apparatus illustrated in FIG. 1 detects a user with a human sensor. 4 is an explanatory diagram illustrating an example of a timing chart in which a signal is transmitted from a transmitter at a predetermined timing by a timing generator and received by a receiver in the human sensor of the image forming apparatus. FIG. 6 is a flowchart showing a flow of processing in which a control unit generates a sensing history in the embodiment of the present invention. 6 is a flowchart showing a flow of processing for determining whether or not the control unit returns from the power saving mode in the embodiment of the present invention. It is explanatory drawing which shows the coordinate value of the block which shows the sensing area which a human sensor can detect a person in this embodiment, and the position in the sensing area. It is explanatory drawing which shows an example of a mode that a user moves a sensing area | region in this embodiment. 3 is an explanatory diagram illustrating an example of a sensing history stored in a storage unit in Embodiment 1. FIG. 10 is an explanatory diagram illustrating an example of a sensing history stored in a storage unit in Embodiment 2. FIG.

Hereinafter, the present invention will be described in more detail with reference to the drawings. In addition, the following description is an illustration in all the points, Comprising: It should not be interpreted as limiting this invention.
(Embodiment 1)
FIG. 1 is a block diagram showing a configuration of an image forming apparatus according to an embodiment of the present invention. FIG. 2 is an explanatory diagram schematically showing how the image forming apparatus shown in FIG. 1 detects a user approaching by a human sensor as indicated by an arrow Ap.

<< Schematic configuration of image forming apparatus >>
The image forming apparatus 1 in this embodiment is a so-called multi-function machine having a plurality of functions, and as a job related to image formation, for example, a copy job, a facsimile job (FAX job. Specifically, a transmission job and a reception job Document filing jobs (jobs that store scanned images in a storage device inside the image forming apparatus), mail jobs (jobs that send scanned images in a format attached to e-mail), and network printer jobs Run.
Among these jobs, the walk-up job is a copy job, a facsimile transmission job, a document filing job, and a mail job.
The image forming apparatus 1 shifts to a power saving mode that consumes less power than usual when a certain period of time elapses in a standby state in which no job is executed. Further, when a job execution request is received during the power saving mode, the power saving mode returns to the normal mode. Here, it takes some time to return from the power saving mode to the normal mode. The user is kept waiting while returning.
Therefore, the user approaching the image forming apparatus 1 is detected by the human sensors 10L and 10R as shown in FIGS. 1 and 2, and the place where the operation panel 60 is arranged for the user to operate the image forming apparatus 1 To return from the power saving mode to the normal mode. This is to reduce the waiting time of the user. However, since not everyone who approaches the image forming apparatus 1 is a user who uses the image forming apparatus, the detection of the user is devised to prevent unnecessary restoration.

As shown in FIG. 1, the image forming apparatus 1 according to this embodiment includes two human sensors to form a sensing area for detecting a person located outside the area where the operation panel 60 is disposed. 10L and 10R are provided. The human sensor 10L includes a transmitter 20L that transmits a signal for detecting a person. Furthermore, it has the receiver 30L which receives the reflected signal which is transmitted from the transmitter 20L and reflected back to the user as the detection object. The same applies to the human sensor 10R. The human sensors 10L and 10R are arranged on the left side and the right side of the operation panel 60 that receives the user's operation.

Then, as shown in FIG. 6, the sensing area 12 is formed outside the front of the operation panel 60.
FIG. 6 is an explanatory diagram illustrating a sensing area in which the human sensor can detect a person and a block coordinate value indicating a position in the sensing area in this embodiment. As shown in FIG. 6, the sensing area is subdivided into blocks having a predetermined width, and each block has a unique coordinate value in the X direction and the Y direction and is distinguished from other blocks. The position of the user is expressed by the coordinate value of the block at the position of the user. The designer may determine the resolution of the X and Y coordinates, that is, the size of the block as appropriate, based on the accuracy of the human sensor, the normal movement speed of the person, the processing load of the control unit 40, and the like. As an example, the resolution of the X and Y coordinates is 30 centimeters. This is a size approximately equivalent to the shoulder width of the child, and can be said to be a reasonable size for determining the similarity of the sensing history. The size of the sensing area is, for example, a radius range of 2 to 4 meters centering on the location of the operation panel 60.

The operation panel 60 illustrated in FIG. 1 receives a user operation related to execution of a walk-up job. The operation panel 60 sends the received operation to the control unit 40 as a signal. The operation panel 60 also has a display unit that displays the setting contents related to the state and operation of the image forming apparatus. The operation panel 60 corresponds to the operation unit of the present invention.
The control unit 40 controls each unit of the image forming apparatus in response to an operation received by the operation panel 60 and controls the contents displayed on the display unit. Moreover, it associates with the user's position which the human sensors 10L and 10R detected and the calculating part 42 calculated, and it stores in the memory | storage part 43 as a sensing history. The control unit 40 is composed of hardware resources including an input / output circuit and a real-time clock with the CPU at the center. The storage unit 43 includes hardware resources such as a flash memory and a RAM.

The document scanning section 71, the image processing section 72, and the printing section 73 are portions related to image formation, that is, job execution. The document scanning unit 71 reads a document. The image processing unit 72 processes image data related to reading and printing of a document. The printing unit 73 prints and outputs the image data. The print processing unit 75 is responsible for executing a network printer job, and includes an image processing unit 72 and a printing unit 73.

The human sensors 10L and 10R are controlled by the control unit 40, and the reflected signals received by the receivers 30L and 30R are input to the control unit 40, respectively. The control unit 40 includes a calculation unit 42 that calculates the distance and direction to the user as the detection object based on the reflected signals. The computing unit 42 identifies the position of the user in the sensing area based on the calculated distance and direction. Furthermore, it is possible to calculate the speed at which the user moves based on the change in position with time. If there is no change in position or it is outside the range of the normal moving speed determined in advance, it is preferable to ignore the detected object as noise.
Furthermore, the control unit 40 has a storage unit 43 that stores the result of the calculation unit 42 as a sensing history and stores other data.

Further, the control unit 40 has a sensing history generation / search unit 45. The sensing history generation / search unit 45 creates a sensing history from the position of the user detected by the human sensors 10L and 10R. When the user comes to the location of the operation panel 60 and the operation panel 60 accepts the operation, a sensing history including information related to the operation is created and stored in the storage unit 43. Further, the document scanning unit 71 may detect an operation related to the document and create a sensing history further including the operation related to the document. The sensing history generation / retrieval unit 45 searches the sensing history stored in the storage unit 43.

Furthermore, the control unit 40 includes a power saving control unit 46 that controls the transition from the normal mode to the power saving mode and the return from the power saving mode to the normal mode. When the person is detected by the human sensors 10L and 10R and the calculation unit 42 calculates the position of the person during the power saving mode, the power saving control unit 46 stores a sensing history similar to the change in the position in the storage unit 43. Check if it is stored. If similar detection histories are stored, the possibility that the walk-up job is started based on the detection histories, that is, the rate at which the operation panel 60 is operated (operations on the document scanning unit 71 may be included). Is calculated. If the ratio is higher than a predetermined threshold value, control is performed to return from the power saving mode to the normal mode.

≪Configuration of human sensor and control part≫
Here, the human sensors 10L and 10R will be described in more detail. Hereinafter, the description of the human sensor 10L can be similarly applied to the human sensor 10R.
As shown in FIGS. 1 and 2, the human sensor 10L includes a transmitter 20L and a receiver 30L. Furthermore, a timing generator 41L, a transmission driver 21L, and an amplifier / comparator 31L are provided.
In addition, as shown in FIG. 2, the operation of each part of the human sensor 10 </ b> L is controlled by the control unit 40. The control unit 40 includes a calculation unit 42, a storage unit 43, a sensing history generation / search unit 45, and a power saving control unit 46. Based on the relationship between the signal transmitted by the transmitter 20L and the reflected signal received by the receiver 30L, the control unit 40 calculates the distance of the path from the transmitter 20L via the user 2 to the receiver 30L.

The timing generator 41L is connected to the transmitter 20L via the transmission driver 21L. The timing generation unit 41L causes the transmitter 20L to transmit a signal at a predetermined timing under the control of the control unit 40. The signal medium may be infrared light or ultrasonic waves.
The receiver 30L is connected to the calculation unit 42 of the control unit 40 via an amplifier / comparator 31L. The amplifier / comparator 31L amplifies the reflected signal transmitted from the transmitter 20L and reflected back by the user 2 as the detection object as an electric signal, and makes it a signal that can be calculated. Then, the signal is sent to the calculation unit 42.

The computing unit 42 calculates the distance from the transmitter 20L to the user 2 based on the reception result of the reception signal by the receiver 30L.
Specifically, when the signal medium is infrared light, the calculation unit 42 calculates the distance from the transmitter 20L to the user 2 from the amount of received light, and when the signal medium is an ultrasonic wave, the time difference of the received signal Thus, the distance from the transmitter 20L to the user 2 is calculated.

The calculation unit 42 similarly calculates the distance to the user 2 for the human sensor 10R. The human sensors 10L and 20L are arranged at a predetermined interval in the horizontal direction. From the distance to the user 2 detected by both at the same time and the interval, the position of the user 2 on the horizontal plane is obtained geometrically.
The calculation unit 42 sequentially calculates positions that change as the user 2 moves. Moreover, you may calculate the moving speed of the user 2 based on the change of the position with respect to time. Then, the calculated position and moving speed of the user 2 are stored in the storage unit 43 as a sensing history.

≪Operation of human sensor≫
Next, operation states of the transmitter 20L and the receiver 30L for detecting the user 2 by the human sensor 10L of the image forming apparatus 1 according to the first embodiment will be described along a timing chart.
FIG. 3 is an explanatory diagram illustrating an example of a timing chart in which a signal is transmitted from a transmitter at a predetermined timing by a timing generator and received by a receiver in the human sensor 10L of the image forming apparatus according to the first embodiment.
As shown in FIG. 3, in the human sensor 10L, a signal for driving the transmitter 20L is output from the timing generator 41L at a predetermined cycle. In the first embodiment, a signal is output from the timing generator 41L at a cycle of 40 KHz.
An ultrasonic wave is used as a signal medium of the transmitter 20L, and it is driven by the signal having a frequency of 40 kHz. In the explanatory diagram shown in FIG. 3, the duty ratio is 50%.

If the number of pulses of the signal transmitted by the transmitter 20L is large, the detection distance becomes large, but it is saturated to some extent, and if it is too large, the power consumption increases, so it is desirable to balance the detection distance.
When the driving frequency and the number of pulses of the transmitter 20L are determined, the burst width is determined. For example, when the driving frequency of the transmitter 20L is 40 kHz and the number of pulses is 10, the burst width is 250 (microseconds).
The transmission waveform by the driving transmission driver 21L is a rectangular wave as shown in FIG. 3, but this is a waveform that electrically drives the transmitter 20L, and does not show an actual ultrasonic waveform. Absent.

In the transmitter 20L, the electrical signal from the transmission driver 21L is converted into an ultrasonic signal (elastic signal). Then, the ultrasonic signal reflected by the user 2 is received by the receiver 30L and converted into a minute electric signal again.
The amplifier / comparator 31L amplifies this minute electric signal with an operational amplifier or the like, and performs envelope detection at a predetermined frequency. By making a signal that exceeds a predetermined threshold value active through the comparator, it can be converted into a digital signal.
By the way, as shown in FIG. 3, the receiver 30L receives the reception signal almost simultaneously with the transmission of the transmission signal from the transmitter 20L driven by the transmission driver 21L. This is transmitted from the transmitter 20L to the receiver 30L. It is a signal that is directly input. This is called “directly reaching wave”. Therefore, when a signal other than the direct reaching wave is received by the receiver 30L, the received signal is a received signal reflected from the user 2.

The computing unit 42 measures the time from the drive time of the transmission signal to the time when the reception signal is received. Thereby, the distance to the user 2 can be calculated.
Specifically, this time is obtained by dividing twice the distance to the user 2 by the speed of sound (about 340 (m / sec) when the temperature is 25 ° C.). Can be calculated.
The calculation unit 42 sequentially records the distance to the user 2 calculated by the above calculation in the storage unit 43.

The time interval for measuring the distance is adjusted by the burst interval.
In the first embodiment, the burst interval is 40 (ms).
When this is converted into a measurement distance, 340 (m / s) × 40 (ms) ÷ 2 = 6.8 (m), and one-way 6.8 (m) or more cannot be measured. If the burst interval is shortened, the number of data points increases and accurate measurement can be performed.

≪Generation of detection history≫
Next, a flow of processing in which the control unit 40 generates a sensing history based on human detection by the human sensor will be described.
FIG. 4 is a flowchart showing a flow of processing in which the control unit 40 generates a sensing history in this embodiment. As shown in FIG. 4, when the human sensors 10L and 10R detect the detected object (step S11), the control unit 40 as the calculation unit 42 sequentially calculates the position of the detected object in response to the detection (step S13). . In this embodiment, the position is represented by the X and Y coordinates of the block in the sensing area 12.

The control unit 40 as the detection history generation / retrieval unit 45 determines that the movement of the user 2 is a movement if the change in the position of the detected object with time is within the range of the normal human movement speed, and the basic data of the detection history Are sequentially stored in the storage unit 43. You may store with a moving speed. Further, the control unit confirms whether or not the user 2 has stayed at a position within a predetermined range (hereinafter, also referred to as an operation position) as a place where the user 2 operates the operation panel 60, and further after having stayed at the operation position in advance. It is confirmed whether or not the operation panel 60 has accepted an operation within a predetermined period (in one example, 1 minute) (step S15). The period is not limited to one minute, and the user may be able to change the setting.
When the user 2 stays at the operation position and the operation panel 60 receives an operation within the period, the detection history generation / search unit 45 sets a flag indicating that the detection history is related to the operation. It is stored in the storage unit 43 together with the flag. On the other hand, other sensing histories are stored in the storage unit 43 without setting the flag because they are not related to the operation.

The detection history generation / retrieval unit 45 takes one unit from the time when the user 2 enters the detection area 12 until the user 2 stays at the operation position. When the user 2 does not stay at the operation position, the unit from the time when the user 2 enters the sensing area 12 until the user 2 leaves is taken as one unit. However, when the traveling direction changes in the middle, the unit may be divided before and after the change (see FIGS. 7 and 8). In this embodiment, in order to compress the data amount of the sensing history and facilitate the similarity determination, the sensing history generation / retrieval unit 45 extracts the start point coordinates, the end point coordinates, and the movement direction from one unit of the basic data. This is stored in the storage unit 43 as a sensing history. Also, the speed of movement is calculated and included in the sensing history. The starting point coordinates are coordinates indicating the position where the user 2 has entered the sensing area 12. The end point coordinates are coordinates indicating the position where the user 2 stays at the operation position, and the coordinates indicating the position where the user 2 leaves the sensing area 12 otherwise.
In this embodiment, the detection history generation / retrieval unit 45 collectively stores the detection history having the same start point coordinates and end point coordinates in the storage unit 43.

FIG. 7 is an explanatory diagram showing an example of how the user 2 moves in the sensing area in this embodiment. FIG. 7 shows four sensing histories. A solid line indicates a detection history related to the operation, and a chain line indicates a detection history not related to the operation. There are two sensing histories related to the operation, and one has (4, 7) as the start point coordinate, the direction of travel changes at (-1, 7), and (-1, 0) as the end point coordinate. In this embodiment, the detection history with (4, 7) as the start point coordinates, (-1, 7) as the end point coordinates, (-1, 7,) as the start point coordinates, and (-1, 0) as the end point coordinates. It is divided into histories and stored in the storage unit 43. The other is that the position (0,8) is the start point coordinate and (0,0) is the end point coordinate.
There are two sensing histories that are not related to the operation, and one has (−4, 7) as the start point coordinates and (4, 7) as the end point coordinates. The other is that the position (5, 6) is the start point coordinate and (-5, 6) is the end point coordinate.

FIG. 8 is an explanatory diagram showing an example of the sensing history stored in the storage unit 43 in this embodiment. The sensing history corresponding to FIG. 7 is included. As shown in FIG. 8, when storing the detection history having the same start point coordinate and end point coordinate, the actual number is incremented (+1) and stored together. If the start point coordinates and the end point coordinates are the same, the movement direction is also the same. If the moving speed is different, it may be further classified according to the speed. Furthermore, you may further classify | categorize by the time slot | zone when the user 2 was detected. The effective start date indicates the date and time when the oldest detection history stored together is stored, and the latest valid date indicates the date and time when the newest one is stored.
The usage history is a flag indicating whether or not the stored sensing history is related to the operation. Even if the start point coordinates and the end point coordinates are the same, they are further classified and stored by a flag.

Returning to the description of FIG.
As the sensing history generation / retrieval unit 45, the control unit 40 searches the newly detected sensing history for data similar to the sensing history already stored in the storage unit 43 (step S17). In this embodiment, the similar data is the same in the start point coordinates, end point coordinates, movement direction, speed, time zone, and usage history shown in FIG. As another mode, for example, if the movement direction is within ± 10 degrees, the same kind of data may be stored together, and the difference between the start point coordinate and / or end coordinate may be in the X and / or Y direction. If it is within 1, it may be stored together as the same kind of data.
If there is similar data (Yes in step S19), the actual number of corresponding sensing histories is incremented (+1) (step S21). If there is no similar data, the detection history detected as a new type of data is stored in the storage unit 43 (step S23). When a new type of data is generated, the valid start date is the date and time of the sensing history that triggered the generation.
The above is the processing related to the generation of the sensing history.

≪Return from power saving mode based on comparison with detection history≫
When the human sensors 10L and 10R detect a person during the power saving mode, the control unit 40 should execute the processing shown in FIG. 4 and start the return from the power saving mode to the normal mode as the power saving control unit 46. Judge whether or not
FIG. 5 is a flowchart showing a flow of processing for determining whether or not the control unit returns from the power saving mode in this embodiment. As shown in FIG. 5, when the human sensors 10L and 10R detect the detected object (step S11), the control unit 40 sequentially calculates the position of the detected object in response to the detection (step S13). Steps S11 and S13 are the same processes as steps S11 and S13 of FIG. 4 and are shown in FIG. 5 for easy understanding of the flow of the processes.

If it is determined that the detected object is the movement of the user 2, the control unit 40 as the power saving control unit 46 checks whether or not the detected sensing history is stored in the storage unit 43 as the sensing history (step S35). . In this embodiment, whether or not they are similar is determined based on the start point coordinates and the end point coordinates. Alternatively, when the end point coordinates are not determined in the middle of the movement of the user 2, the moving direction may be obtained from the position closest to the starting point coordinates to determine whether or not they are similar based on the starting point coordinates and the moving direction. . Furthermore, determination may be made including at least one of the moving direction, speed, and time zone. At this stage, the usage history includes both use and non-use. As will be described later, this is because the ratio of the items related to the operation is calculated based on both.

When similar sensing histories are found, the sum of the number of items related to the operation (the number of results) and the number of items not related to the operation (the number of results) is obtained, and the ratio of those related to the operation is calculated (step S37). ). Now, assuming that the number of items related to operations is A and the number of items not related to operations is B, the above-mentioned ratio is calculated as A / (A + B) × 100 [%].
As an extreme example, there may be a case where the number of things related to the operation is 1 and the number of things not related to the operation is zero. In that case, the aforementioned ratio is 100%. Further, when the number of items related to the operation is zero and the number of items not related to the operation is 1, the above-mentioned ratio is zero%.
Subsequently, the power saving control unit 46 compares the ratio of the items related to the operation with a predetermined threshold (step S39).

When the ratio of the sensing history related to the operation is higher than the threshold (Yes in Step S39), the power saving control unit 46 performs control so as to return from the power saving mode to the normal mode (Step S41). On the other hand, when the ratio of the sensing history related to the operation is equal to or less than the threshold (No in step S39), the power saving control unit 46 performs control so as to maintain the power saving mode (step S43).
Here, as a result of searching the storage unit 43, there may be no similar sensing history. That is, the number of items related to the operation is zero, and the number of items not related to the operation is zero. In that case, what is necessary is just to predetermine that the above-mentioned ratio shall be either zero or 100%. In other words, when approaching on a route with no track record, return to the normal mode after the actual operation is performed, or return to the normal mode when the user 2 enters the sensing area 12 To. The choice is whether to prioritize power saving or not to wait for the user, and may be determined by the designer or set by the user.
The above is the process of the return control from the power saving mode based on the comparison with the sensing history.

(Embodiment 2)
In this embodiment, a technique for more reliably distinguishing a user who simply picks up an output print sheet from a user of a walk-up job after executing a network printer job will be described.
In this embodiment, the control unit 40 as the detection history generation / search unit 45 receives print data from a processing apparatus connected to the image forming apparatus 1 via a network. When printing processing based on the print data (network printer job) is performed, the sensing history is stored in the storage unit 43 for a predetermined period after receiving the print data, distinct from other periods. The sensing history generation / retrieval unit 45 acquires information related to the processing device that has transmitted the print data or the user who has performed the processing related to the generation of print data in the processing device, together with the print data. The information may be an IP address of a processing device as an example, and may be user account information provided by the processing device as another example. The period is 1 minute as an example, but is not limited to this, and the user may be able to change the setting.

FIG. 9 is an explanatory diagram showing an example of the sensing history stored in the storage unit 43 in this embodiment. The detection history when the time zone is “after printer” indicates that it is within the period. That is, it corresponds to a print collection pattern. The data other than the period is the same data as in FIG. “Person A” in the “printed user name” column in FIG. 9 indicates information of the user account that the processing apparatus that generated the print data has authenticated at the time of generation.

In this embodiment, the power saving control unit 46 includes a time zone in the similar condition when checking whether a similar detection history is stored in the storage unit 43 as the detection history. Therefore, the sensing history detected within the period after receiving the print data is not similar unless the “time zone” is “after printer”. Further, if the “printed user names” are not the same, they are not similar. It is considered that the sensing history within the period after receiving the print data includes a large number of user movements to obtain the output print sheet. Therefore, it can be considered that the ratio of those not related to the operation is larger than the sensing history outside the period. That is, as a result of comparison with the threshold value, the ratio of returning from the power saving mode to the normal mode is considered to be smaller than that outside the period.

As a different mode, the power saving mode is set on the assumption that the same user will come to pick up the print sheet if the storage history 43 stores a detection history similar to the detection history detected within the period after receiving the print data. You may make it maintain. In that case, if there is no similar detection history, similar detection history is searched out of the detection histories outside the period except for the “time zone” condition, and related to the operation as described in the first embodiment. It may be determined whether or not to return from the power saving mode to the normal mode by calculating a ratio of the objects and comparing with a threshold value.

(Embodiment 3)
In this embodiment, for example, a time zone in which many people move regardless of the use of the image forming apparatus, such as a commuting time zone or a break time zone of the office where the image forming apparatus is installed, can be registered in advance.
When the power saving control unit 46 determines whether or not to return to the normal mode when the human sensors 10L and 10R detect the user 2 during the power saving mode, the time when the user 2 is detected is registered. First of all, check whether or not it is time. In the registered time zone, the threshold used for determining whether or not to return is corrected to reduce useless return.

As a different mode, the registered time zone and other time zones may be registered as separate sensing histories. In this way, the registered history of detection during the time period naturally includes a lot of information not related to the operation.
The power saving control unit 46 includes the time zone in the similar condition when checking whether a similar thing to the detected sensing history is stored in the storage unit 43 as the sensing history. Therefore, the ratio related to the operation is calculated by comparing the detection history detected in the registered time zone with the detection history corresponding to the time zone. As described above, since the ratio of detection histories in the registered time zone is not related to the operation, the rate of returning from the power saving mode is smaller than that outside the registered time zone.

As mentioned above,
(I) An image forming apparatus according to the present invention stores a human sensor that detects a direction of a moving person and a distance to the person, and a distance and a direction that change with the movement of the detected person as a sensing history. A storage unit, an operation unit that accepts an operation by a user, a transition to a power saving mode and a return from the power saving mode to a normal mode, and a person moves to a place where the operation unit is arranged When the operation unit accepts the operation, the control unit stores a detection history related to the operation so as to be distinguishable from a detection history not related to the operation, and the control unit is the power sensor in the power saving mode state. When a person is detected, it is checked whether a sensory history similar to the detected change in direction and distance is stored in the storage unit, and if at least one similar sensory history is stored, it is similar. And determining whether to maintain the power saving mode or to return to the normal mode based on the percentage of those associated with the operation of the sensing history.

Furthermore, the preferable aspect of this invention is demonstrated.
(Ii) The control unit may calculate the movement speed of the person based on changes in the distance and direction, and may determine whether the person is similar including the calculated movement speed.
In this way, by including the moving speed in the determination element, it is possible to more accurately determine the similarity to the return pattern and prevent unnecessary return from the power saving mode.

(Iii) a print processing unit that receives print data transmitted from an external processing device and processes image formation based on the print data, and the print processing unit sets a transmission-side attribute related to the print data; Power-saving mode state acquired at the time of reception and stored in the storage unit including the attribute so that the sensory history stored within a predetermined period after receiving the print data can be distinguished from other sensory histories When the human sensor detects a person within the period after receiving the print data at, a change in direction and distance detected with reference to the storage unit and a sensing history similar to the attribute are stored in the storage unit. If at least one similar sensing history is obtained, it is determined whether or not to maintain the power saving mode based on the proportion of the sensing histories that are not related to the operation. It may be.
In this way, within the predetermined period after receiving the print data, the attribute of the print data transmission side is included in the determination element to more accurately determine the similarity with the print collection pattern and from the power saving mode. Unnecessary return can be prevented.

(Iv) The attribute may include identification information indicating either the processing device that transmitted the print data or the user that generated the print data.
In this way, within a predetermined period after receiving the print data, it is printed and output by including the identification information of the processing device that transmitted the print data or the user who generated the print data in the determination element. It is possible to more accurately identify a person who has just picked up the printed sheet and prevent unnecessary return from the power saving mode.

(V) a clock unit that provides a current date and time, wherein the storage unit stores in advance the date and time when many people move regardless of the operation; When the sensor detects a person, the threshold for determining whether to return to the normal mode may be changed according to whether the current date and time belongs to the date and time when the person moves regardless of the operation.
In this way, for example, even if a large number of people move regardless of the use of the image forming apparatus during the commuting time or break time of the office where the image forming apparatus is installed, unnecessary return from the power saving mode is performed. Can be prevented.
Preferred embodiments of the present invention include combinations of any of the plurality of embodiments described above.
In addition to the embodiments described above, there can be various modifications of the present invention. These modifications should not be construed as not belonging to the scope of the present invention. The present invention should include the meaning equivalent to the scope of the claims and all modifications within the scope.

1: image forming apparatus, 2: user, 10L, 10R: human sensor, 12: sensing area, 20L, 20R: transmitter, 21L, 21R: transmission driver, 30L, 30R: receiver, 31L, 31R: amplifier / Comparator, 40: control unit, 41L, 41R: timing generation unit, 42: calculation unit, 43: storage unit, 45: sensing history generation / search unit, 46: power saving control unit, 60: operation panel, 71: document scanning 72: Image processing unit 73: Printing unit 75: Print processing unit

Claims

A human sensor that detects the direction of the moving person and the distance to the person,
A storage unit that stores the distance and direction that change with the movement of the detected person as a sensing history;
An operation unit that accepts user operations;
A print processing unit that receives print data transmitted by an external processing device and processes image formation based on the print data ;
Controlling the transition to the power saving mode and the return from the power saving mode to the normal mode, and related to the operation when a person moves to the place where the operation unit is arranged and the operation unit accepts the operation. As a sensing history, comprising a control unit that stores the sensing history that is not related to the operation in a distinguishable manner,
The print processing unit obtains the attribute of the transmission side related to the print data when receiving,
The control unit stores the sensing history stored within a predetermined period after receiving the print data in the storage unit so that the sensing history can be distinguished from other sensing history and includes the attributes, and is printed in the power saving mode state. When the human sensor detects a person within the period after receiving data, a change in direction and distance detected with reference to the storage unit and a sensing history similar to the attribute are stored in the storage unit. determine with which the image forming apparatus determines whether to maintain the power saving mode based on the ratio but not associated with the operation of the sensing history Motoma' If at least one similar sense history has Motoma'.
A human sensor that detects the direction of the moving person and the distance to the person,
A storage unit that stores the distance and direction that change with the movement of the detected person as a sensing history;
An operation unit that accepts user operations;
A clock that provides the current date and time ,
Controlling the transition to the power saving mode and the return from the power saving mode to the normal mode, and related to the operation when a person moves to the place where the operation unit is arranged and the operation unit accepts the operation. As a sensing history, comprising a control unit that stores the sensing history that is not related to the operation in a distinguishable manner,
The storage unit stores in advance the date and time when many people move regardless of the operation,
When the human sensor detects a person in the power saving mode state, the control unit checks whether a sensing history similar to the detected change in direction and distance is stored in the storage unit, and at least one similar If the sensing history to be stored is stored, it is determined whether to return to the normal mode or to maintain the power saving mode based on the ratio of the similar sensing history related to the operation, and the current date and time is the operation An image forming apparatus that changes a threshold value for determining whether to return to the normal mode according to whether or not a person belongs to a date and time when the person moves.
3. The image forming apparatus according to claim 1, wherein the control unit calculates a moving speed of the person based on a change in distance and direction, and determines whether the person is similar including the calculated moving speed. 4.
It further includes a clock unit that provides the current date and time,
The storage unit stores in advance the date and time when many people move regardless of the operation,
When the human sensor detects a person in the power saving mode state, the control unit returns to the normal mode according to whether the current date / time belongs to the date / time when the person moves regardless of the operation. The image forming apparatus according to claim 1 , wherein a threshold value related to the determination is changed.
The image forming apparatus according to claim 1 , wherein the attribute includes identification information indicating either a processing apparatus that has transmitted print data or a user that has generated print data.