JP2008046304A - Power saving controller and image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power saving controller capable of contributing to the power saving of a predetermined device that is a power economization control object by setting the predetermined device to an optimum power economization state. <P>SOLUTION: The power saving controller 1 includes: a photodetector part 10 for detecting the brightness of the outside of an image forming apparatus 100; a processing part 20 for obtaining the variation of brightness detected by the photodetector part 10 per predetermined time; a discrimination part 30 for discriminating that the variation obtained by the processing part 20 attains a predetermined value; and a control part 40 for changing the power economization level of the power economization state in which power consumption for the image forming apparatus 100 is reduced when the discrimination part 30 discriminates that the variation attains the predetermined value, and performing power economization control for the image forming apparatus 100 based on the power economization level already changed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a power saving control device that performs power saving control for reducing power consumption of a predetermined device, and an image forming apparatus having the power saving control device.

  Conventionally, a given electronic device such as an image forming apparatus is consumed to realize energy saving when it is in an operating state (normal use state) but has not been used for a predetermined period of time. It has been proposed or realized that the state is shifted to a power saving state (power saving mode) for reducing power and waits until a factor of power saving return (return from power saving mode) occurs.

As an image forming apparatus having a power saving mode function, the one disclosed in Patent Document 1 is known. In the image forming apparatus disclosed in Patent Document 1, when the brightness outside the apparatus is less than a predetermined amount, it is determined that the outside of the apparatus is “dark” and the sleep state is changed from the ON state (corresponding to the normal use state) to SLEEP. Switch to the state (corresponding to the power saving state), and if the brightness outside the device is greater than or equal to a predetermined amount, it is judged that the device outside is “bright” and the SLEEP state (corresponding to the power saving state) is switched to the ON state (normal use state) Equivalent to).
JP-A-6-289669

  However, in the technique disclosed in Patent Document 1, for example, when the image forming apparatus is installed in a position near a window in the room such as an office where external light is incident, Even when the lamp is in the off state, the power saving state is canceled and the normal use state due to the fact that the brightness outside the image forming apparatus exceeds a predetermined amount due to external light incident through the window. There is a problem that wasteful electric power is consumed.

  Accordingly, an object of the present invention is to provide a power saving control device that can contribute to power saving of a predetermined device by setting a predetermined device to be power saving controlled to an optimal power saving state.

  It is another object of the present invention to provide an image forming apparatus capable of saving power by setting an optimum power saving state.

  In order to solve the above problems, a power saving control device according to the present invention is provided in a predetermined device, and is a power saving control device that performs power saving control for reducing power consumption of the predetermined device. A detecting unit for detecting brightness outside the predetermined device; a processing unit for determining a change amount of brightness detected by the detecting unit per predetermined time; and a change obtained by the processing unit. A discriminating unit for discriminating that the amount has reached a predetermined value; and when the discriminating unit determines that the amount of change has reached the predetermined value, the power consumption for the predetermined device Control means for changing a power saving level in a power saving state for reducing power consumption and performing power saving control on the predetermined device based on the power saving level after the change.

  According to a second aspect of the present invention, in the first aspect of the present invention, when the amount of change is based on a change in the direction in which the brightness increases, the control means sets the current power saving state. Changing to a power saving level lower than the power saving level, and if the amount of change is based on a change in the direction of decreasing brightness, changing the power saving state to a power saving level higher than the current power saving level. And

  According to a third aspect of the present invention, in the invention according to the first or second aspect, the control means is configured such that when the change amount is based on a steep change in a direction in which brightness increases, If the brightness after the change due to a sudden change continues for a certain period of time, the power saving state is changed to a power saving level lower than the current power saving level, and the brightness after the change due to the abrupt change continues for the certain period of time. If not, maintain the power saving state at the current power saving level, and if the amount of change is based on a steep change in the direction of decreasing brightness, after the change due to the steep change If the brightness of the battery has continued for the predetermined time, the power saving state is changed to a power saving level higher than the current power saving level, and the brightness after the change due to the steep change has not continued for the predetermined time. When maintains the power saving state to the current conservation level, characterized in that.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the control means is configured such that the lighting means in the room where the predetermined device is arranged changes from a lighting state to a non-lighting state. When the transition is made, the predetermined device is shifted from the power saving state at the first power saving level to the power saving state at the second power saving level higher than the first power saving level, and the lighting unit is changed from the off state to the lighting state. When the transition is made, the predetermined device is shifted from the power saving state at the second power saving level to the power saving state at the first power saving level.

  In order to solve the above problems, an image forming apparatus according to a fifth aspect of the present invention includes the power saving control apparatus according to any one of the first to fourth aspects.

  According to a sixth aspect of the present invention, in the invention of the fifth aspect, a processing request receiving unit that receives an image forming processing request from a client, and an image corresponding to the image forming processing request received by the processing request receiving unit. An image forming unit that executes a forming process, and the control unit of the power saving control device cancels the power saving state when the processing request receiving unit receives the image forming process request, and the image forming unit After the image forming process corresponding to the image forming process request by the means is completed, the power saving state before the release is restored.

  The invention according to claim 7 is the invention according to claim 6, wherein the control unit cancels the image forming process by the image forming unit when a predetermined time elapses from the end of the image forming process. Returning to the previous power saving state or returning to the power saving state before release immediately after the image forming process by the image forming means is completed.

  According to the power saving control device of the present invention, when the amount of change in brightness outside the predetermined device is equal to or greater than a predetermined value, the power saving level of the power saving state for the predetermined device is changed, and the change Since the power-saving control is performed for the specified device based on the power-saving level afterwards, the indoor lighting unit is turned on from the off state without being affected by changes in brightness due to movement of people or outside light. When the amount of change in brightness exceeds a predetermined value, such as when transitioning to a state or when transitioning from a lit state to an unlit state, the predetermined device can be put into a power saving state at an optimal power saving level, This can contribute to power saving of a predetermined device.

  Further, according to the power saving control device of the present invention, when the amount of change in brightness becomes a predetermined value or more, such as when the indoor lighting means shifts from the off state to the on state, the predetermined device has a low power saving level. Since the power saving state can be set, the return from the power saving state to the normal use state can be accelerated, which can contribute to the improvement of the convenience of the predetermined device.

  According to the image forming apparatus of the present invention, the power saving state of the optimum power saving level according to the lighting state or the non-lighting state of the indoor lighting means without being affected by the brightness change due to the movement of the person or the outside light In addition, it is possible to save power and improve convenience.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that components having the same function are denoted by the same reference symbols throughout the drawings for describing the embodiment, and the repetitive description thereof will be omitted.

  (Embodiment 1)

  FIG. 1 shows a functional configuration of a power saving control apparatus according to Embodiment 1 of the present invention.

  As shown in FIG. 1, the power saving control device 1 includes a light detection unit (light detection unit) 10 that detects brightness outside a predetermined device, for example, the image forming apparatus 100, and a predetermined time (hereinafter, “predetermined time”). The processing unit (processing means) 20 for obtaining the amount of change in brightness detected by the per-light detection unit 10 and the amount of change obtained by the processing unit 20 are referred to as predetermined values (hereinafter referred to as “predetermined values”). ), And when it is determined by the determination unit 30 that the amount of change has reached a predetermined value, the power consumption for the image forming apparatus 100 is reduced. And a control unit (processing means) 40 that changes the power saving level of the power saving state to be performed and performs power saving control on the image forming apparatus 100 based on the changed power saving level.

  Such a power saving control apparatus 1 is provided in an image forming apparatus (predetermined apparatus) 100 installed in a room such as an office. In FIG. 1, for convenience of explanation, the power saving control device 1 and the image forming apparatus 100 are illustrated separately. An electric lamp (illuminating means) 50 such as a fluorescent lamp is disposed in a room such as an office.

  FIG. 2 is a diagram illustrating a process for changing the power saving level in the power saving state by the power saving control device 1.

  2A shows a timing chart of the operation of changing the power saving level of the power saving state for the image forming apparatus 100 by the control unit 40, and FIG. 2B shows the change in the result of detecting the light intensity by the light detection unit 10. The state of is shown.

  In the vertical axis of FIG. 2A (power saving level axis), the lower the power saving level, the higher the power consumption (the higher the power saving level, the lower the power consumption).

  In the vertical axis of FIG. 2B (light quantity detection level axis), the lower the light quantity detection level, the darker the outside of the light detection unit 10 (in other words, the image forming apparatus 100) (the light quantity detection level is “high”). ”Means that the outside of the light detection unit 10 becomes brighter).

  2A and 2B, the time point t1 is the time point of sunrise (time), the time point t2 is the time point when the lamp 50 is shifted from the unlit state to the lit state (lighted state for business start), and the time point t3 is At the time t4 when the light 50 is changed from the lighted state to the light-off state (light-off state due to the lunch break time), at time t4, the light 50 is moved from the light-off state to the light-on state (light-on state after the lunch break time is finished). The time point t5 is a time point when the electric lamp 50 is shifted from the lighting state to the extinguishing state (the extinguishing state because of the end of business).

  Further, from time 0 to time t2, the lamp 50 is in the extinguished state period T1, and from time 2 to time t3, the lamp 50 is in the lit state period T2, and from time 3 to time t4 is the lamp. 50 is a light-off state period T3 in which the lamp 50 is in a light-off state, a time period 4 to a time point t5 is a light-on state period T4 in which the lamp 50 is in a light-on state, and a time point 5 to a time point t6 is a light-off state period T5. And

  Next, the power saving control device 1 will be described in detail with reference to FIGS. 1 and 2.

  The light detection unit 10 detects the brightness outside the image forming apparatus 100, detects the intensity of light including light emitted from the electric lamp 50, and processes an electrical signal corresponding to the detected result. To the unit 20. An example of a change in the result of detecting the light intensity by the light detection unit 10 is shown in FIG.

  In FIG. 2B, the eight vertical lines indicated by the symbol N indicate the state of change in light intensity due to the occurrence of the above event (steep in the direction in which the light intensity decreases). (Changing state).

  The processing unit 20 obtains a change amount of the light intensity per predetermined time based on an electrical signal corresponding to the light intensity from the light detection unit 10, and sends the change amount of the light intensity to the determination unit 30. Output. Here, a change amount of light intensity (hereinafter referred to as “light change amount”) is assumed to be ΔL.

  Specifically, the processing unit 20 samples the intensity of light by the light detection unit 10 every predetermined time (sampling interval), that is, detects detection information (data indicating an electrical signal) from the light detection unit 10 every predetermined time T. Obtaining and obtaining the light change amount ΔL based on the current detection information and the previous detection information. Here, T is a predetermined time for obtaining the light change amount ΔL.

  The light change amount ΔL includes, for example, a light change amount based on a change in the direction in which the brightness increases, for example, when the lamp 50 shifts from the unlit state to the lit state at time t2 or t4, and for example, at time t3 or time t5 There is a light change amount based on a change in the direction in which the brightness decreases, such as when 50 shifts from a lighted state to a lighted off state. The former light change amount ΔL has a “plus” sign, and the latter light change amount ΔL has a “minus” sign.

  Here, it demonstrates concretely. Of the results (detection results) of detecting the light intensity by the light detection unit 10, the detection results at predetermined points in time are L1 to L8 as shown in FIG. 2B, and the amount of light change based on these detection results is determined. Let ΔL1-ΔL4.

  In this case, the light change amounts are “L2−L1 = + ΔL1”, “L4−L3 = −ΔL2”, “L6−L5 = + ΔL3”, and “L8−L7 = −ΔL4”.

  That is, as described above, for example, when the lamp 50 is shifted from the off state to the on state at the time point 2, the light change amount ΔL is the detection result L2−the detection result L1 and becomes “plus sign”. On the other hand, for example, when the electric lamp 50 is shifted from the lighting state to the extinguishing state at time t3, the light change amount ΔL is the detection result L4−the detection result L3 and becomes “minus sign”.

  Since the processing unit 20 can obtain the “light change amount ΔL per predetermined time T” as described above, the “light change amount ΔL / predetermined time T”, that is, the light intensity change rate is obtained. You can also. In this case, the rate of change is output to the determination unit 30.

  The determination unit 30 determines whether or not the absolute value of the light change amount ΔL from the processing unit 20 has reached a predetermined value, and if it is determined that the light change amount ΔL has reached a predetermined value, that fact. The power saving level change information is notified to the control unit 40. On the other hand, when it is determined that the light change amount ΔL has not reached the predetermined value, nothing is notified to the control unit 40 and the determination process is continued.

  As the power saving level change information, when the sign of the light change amount ΔL is “plus”, it indicates that “the light change amount ΔL is based on a change in the direction in which the brightness increases” and the light change amount ΔL. Is “minus”, the control unit 40 is notified that “the light change amount ΔL is based on a change in the direction in which the brightness decreases”.

  Here, when the sign of the light change amount ΔL is “plus”, for example, information indicating level 1, and when the sign of the light change amount ΔL is “minus”, information indicating level 2, for example, is provided. These are the power saving level change information.

  Thus, the light change amount ΔL includes a case where the light change amount is based on a steep change in the direction in which the brightness increases and a case where the light change amount ΔL is based on a steep change in the direction in which the brightness decreases.

  Therefore, when determining that the absolute value of the light change amount ΔL from the processing unit 20 has reached a predetermined value, the determination unit 30 reaches the predetermined value of the absolute value of the light change amount ΔL from the processing unit 20, Further, only when the brightness after the change continues for a certain time, it is determined that the absolute value of the light change amount ΔL from the processing unit 20 has reached a predetermined value.

  For example, this is indicated by reference numeral N in FIG. 2B when a person interrupts between the light detection unit 10 of the image forming apparatus 100 and the lamp 50 when the lamp 50 is in a lighting state. This is because, as indicated by the vertical line of the book, an event occurs in which the brightness changes sharply (changes sharply in the direction in which the brightness decreases), and thus the change in brightness due to this event is regarded as noise.

  By the way, whether the brightness after the change corresponding to the detection result after the change when it is determined that the absolute value of the light change amount ΔL has reached the predetermined value corresponds to the constant time. It is possible to know whether or not a plurality of detection results obtained by sampling in the time to perform is equivalent to the detection result after the change. In this case, when the plurality of detection results are equal to the detection result after the change, it is determined that the brightness after the change continues for a certain time.

  Therefore, when determining that the absolute value of the light change amount ΔL from the processing unit 20 has reached a predetermined value, the determination unit 30 samples the processing unit 20 for a time corresponding to a predetermined time. The latest (this time) detection result is requested.

  In addition, when receiving the change rate (“light change amount ΔL / predetermined time)” from the processing unit 20, the determination unit 30 determines that the change rate has reached a predetermined value. The predetermined value is different between the predetermined value (first predetermined value) when the light change amount ΔL is used and the predetermined value (second predetermined value) when the change rate H is used (first predetermined value ≠ first 2).

  When the light change amount ΔL is determined to have reached a predetermined value by the determination unit 30, the control unit 40 changes the power saving level in the power saving state for reducing the power consumption to the image forming apparatus 100, and changes the light saving level. Power saving control is performed on the image forming apparatus 100 based on the subsequent power saving level.

  Specifically, the control unit 40 executes processing for changing the power saving level in the power saving state (power saving level changing processing) based on the notification content notified from the determination unit 30.

  This power saving level changing process includes the following changing processes (1) to (4).

  (1) When the fact that “the light change amount ΔL is based on a change in the direction of increasing brightness” is received as the power saving level change information, the power saving state is changed to a power saving level lower than the current power saving level. .

  When it is received as the power saving level change information that “the light change amount ΔL is based on a change in the direction in which the brightness increases”, the power saving level change information includes “the light change amount ΔL is the brightness. In the case where the brightness is based on a steep change in the increasing direction, the brightness after the change due to the steep change continues for a certain period of time.

  The changing process (1) is executed when the electric lamp 50 shifts from the off state to the on state.

  (2) When the fact that “the light change amount ΔL is based on a change in the direction in which the brightness decreases” is received as the power saving level change information, the power saving state is changed to a power saving level higher than the current power saving level.

  When the power saving level change information indicates that “the light change amount ΔL is based on a change in the direction in which the brightness decreases”, the power saving level change information includes “the light change amount ΔL is the brightness. In the case where the brightness is based on a steep change in a decreasing direction, the brightness after the change due to the steep change continues for a certain period of time.

  The changing process (2) is executed when the electric lamp 50 shifts from the lighting state to the extinguishing state.

  (3) When the light change amount ΔL is based on a steep change in the direction in which the brightness increases, and the brightness after the change due to the steep change is not continued for a certain time, As a result of the determination by the determination unit 30, it is determined that the absolute value of the light change amount ΔL has not reached the predetermined value, and nothing is notified from the determination unit 30, so the power saving level changing process is not performed. In other words, the current power saving level is maintained.

  The change process of (3) is based on the fact that when the lamp 50 is in the extinguished state, the person turned the lamp 50 on and then switched off again for less than a certain time. This is executed when an event occurs in which a sharp change occurs in a direction in which the brightness increases (direction in which the brightness increases).

  (4) The light change amount ΔL is based on a steep change in the direction in which the brightness decreases, such as the light change amount based on the change in light intensity corresponding to the vertical line indicated by the symbol N in FIG. In the case where the brightness after the change due to the steep change does not continue for a certain period of time, the determination result by the determination unit 30 indicates that the absolute value of the light change amount ΔL reaches a predetermined value. Since no determination is made and no notification is given from the determination unit 30, the power saving level changing process is not performed. In other words, the current power saving level is maintained.

  In the change process of (4), when the lamp 50 is in the lighting state, the light intensity is reduced due to a person blocking the gap between the light detection unit 10 and the lamp 50 of the image forming apparatus 100. This is executed when an event of abrupt change in the direction (direction in which the brightness decreases) occurs.

  FIG. 3 shows a main configuration of an image forming apparatus having the power saving control device of the present invention.

  As shown in FIG. 3, the image forming apparatus 100 has a copying function for copying a document, a printing function for printing document information, and a scanning function for scanning a document, and includes a controller 110, an operation panel unit 120, and image formation. Section 130, machine control section (MCU) 140, fixing section (heater) 150, drive section 160 and power supply section 170. Further, the image forming apparatus 100 is provided with the light detection unit 10 shown in FIG. 1 in a state in which light outside the apparatus can be detected.

  The controller 110 controls the entire image forming apparatus 100, and includes an ASIC (Application Specific Integrated Circuit) 111, a CPU (Central Processing Unit) 112, a ROM (Read Only Memory) 113, and a RAM (As needed. A read / write memory) 114. Details of the controller 110 will be described later.

  The operation panel unit 120 is used to display a predetermined message, perform a setting operation related to copying such as specifying a paper size, a copy magnification, and the number of copies when copying a document, an instruction operation to instruct to start copying, and the like. Is.

  The image forming unit 130 executes image forming processing, and includes a photoconductor (not shown) on which an electrostatic latent image is formed, a developing device (not shown) that forms a toner image on the photoconductor, It has a unit for executing an electrophotographic process such as a transfer unit (not shown) for transferring a toner image onto a sheet.

  The machine control unit 140 is a unit (or component) that is to be operated when the image forming process is performed, such as the photosensitive member, the developing unit, a conveyance roller (not shown) that conveys paper, a fixing unit 150, and a driving unit 160. To control.

  The fixing unit (heater) 150 fixes the toner image of the sheet on which the toner image has been transferred to the sheet by a heated heater under the control of the machine control unit 140.

  The drive unit 160 is a unit (or component) to be operated at the time of executing image forming processing, such as rotational driving of components such as the photosensitive member, the developing roller of the developing device, and the conveying roller, under the control of the machine control unit 140. ) (Rotation drive), for example, a motor.

  Under the control of the CPU 112 of the controller 110, the power supply unit 170 is provided for each of the light detection unit 10, the controller 110, the operation panel unit 120, the image forming unit 130, the machine control unit 140, the fixing unit 150, and the driving unit 160. A predetermined power (power supply voltage) suitable for the operation of the component is supplied.

  Here, the controller 110 will be described.

  In the controller 110, the ROM 113 stores information indicating a power saving target component corresponding to the power saving level (hereinafter referred to as “power saving target element information”) and a predetermined program including a program necessary for the CPU 112 to operate. Has been.

  The RAM 114 stores data indicating the detection result (electrical signal) of the light detection unit 10, predetermined data required for calculation processing and determination processing by the ASIC 111, and current power saving that is referred to when the CPU 112 changes the power saving level. Information indicating the level is stored.

  The ASIC 111 has the functions of the processing unit 20 and the determination unit 30 described above, and the light change amount calculation based on the result of detecting the light intensity by the light detection unit 10 as described above by these components. A determination process is performed to determine whether the processing result (light change amount) has reached a predetermined value. Further, the ASIC 111 notifies the CPU 112 of the fact that the amount of light change has reached a predetermined value and the power saving level change information in that case.

  The CPU 112 has the function of the control unit 40 described above, and executes a power saving level changing process based on the notification content notified from the ASIC 111.

  Specifically, based on the notification content notified from the ASIC 111, the CPU 112 instructs the controller 110, based on the power saving target element information corresponding to the changed power saving level read from the ROM 113 to the power supply unit 170 described later. An instruction is given to stop the supply of power to all or a part of each component (each unit) of the operation panel unit 120, the image forming unit 130, the machine control unit 140, the fixing unit 150, and the driving unit 160.

  The CPU 112 controls the entire image forming apparatus 100 as well as the power saving level changing process.

  In the first embodiment, in the image forming apparatus 100, the controller 110 and the light detection unit 10 constitute the power saving control device 1. Accordingly, the controller 110 has a part of the functions of the power saving control device 1 and also has a function of controlling the entire image forming apparatus 100.

  Next, the power saving level changing process (power saving level changing process in the power saving state) by the power saving control device 1 will be described with reference to FIG.

  FIG. 4 is a flowchart showing a processing procedure of the power saving level changing process.

  Here, it is assumed that the processing unit 20 calculates the change rate H (“light change amount ΔL / predetermined time T”).

  First, the light detection unit 10 detects (measures) brightness outside the image forming apparatus 100, that is, light intensity (step S101). In this case, the light detection unit 10 converts the detection result into an electrical signal corresponding to the detection level value as the detection result, and outputs this to the controller 110 as detection information.

  In the controller 110, the ASIC 111 samples the detection result of the light intensity by the light detection unit 10 every predetermined time T, that is, obtains detection information (data indicating an electrical signal) from the light detection unit 10 every predetermined time T. (Step S102), this is stored in the RAM 114, and it is determined whether or not the light intensity is changing in the increasing direction based on the current detection information and the previous detection information stored in the RAM 114. (Step S103).

  Next, when the ASIC 111 determines in step S103 that the light intensity has changed in the increasing direction, the light change amount ΔL based on the predetermined time T, the current detection information, and the previous detection information, The rate of change H is obtained based on the above, and it is determined whether or not the obtained rate of change H has reached a predetermined value (step S104).

  Subsequently, when the ASIC 111 determines in step S104 that the rate of change H has reached a predetermined value, the light intensity (brightness) after the change based on the current detection information is set for a predetermined time. It is determined whether or not (for example, 10 seconds) or more is continued (step S105). If the intensity of the light after the change continues for a certain time or more as a result of the determination, the rate of change H is a predetermined value. And the power saving level change information (in this case, information indicating level 1) is notified to the CPU 112.

  In step S105, in the ASIC 111, the determination unit 30 requests the processing unit 20 for the latest (current) detection result obtained by sampling for a time corresponding to a predetermined time. And the discrimination | determination part 30 discriminate | determines whether the some detection information from the process part 20 which responded to this request | requirement is equivalent to this detection information used when calculating | requiring the change rate H in step S104, If it is equal to this, it is determined that the intensity (brightness) of the light after the change continues for a certain time or more.

  Here, in step S105, it is determined that the light intensity (brightness) after the change continues for a certain time or more, for example, when the lamp 50 is changed from the unlit state to the lit state at time t2. is there. In addition, it is judged that the light intensity (brightness) after the change has not continued for a certain period of time or more. For example, a person (employee, etc.) has turned on the lamp 50 for indoor confirmation. Later, when the light is turned off before the predetermined time is reached.

  Here, a specific example will be described. For example, when the detection result L2 is obtained as the current detection information at time t2 and the detection result as the previous detection information is the detection result L1, it is determined that the light intensity is changing in the increasing direction. Therefore, “current detection information (detection result L2) −previous detection information (detection result L1)” is calculated, and a positive light change amount ΔL1 is obtained. Based on the absolute value of the light change amount ΔL1 and the predetermined time T, the change rate H is obtained.

  In this example, since the lamp 50 is shifted from the extinguished state to the lit state at time t2, it is determined that the rate of change H has reached a predetermined value, and further the intensity of light (brightness) after the change. ) Continues for a certain period of time.

  As a result, information indicating that the rate of change H has reached a predetermined value and level 1 as power saving level change information is notified from the ASIC 111 to the CPU 112.

  Then, the CPU 112 changes the power saving state of the image forming apparatus 100 to a power saving level (level 1) lower than the current power saving level (level 2) based on the notification content notified from the ASIC 111 (step S106).

  By the way, the ASIC 111 that has determined that the light intensity has not changed in the increasing direction in step S <b> 103 decreases the light intensity based on the current detection information and the previous detection information stored in the RAM 114. It is determined whether the direction has changed (step S107).

  Next, when the ASIC 111 determines in step S107 that the light intensity has changed in a decreasing direction, the light change amount ΔL based on the predetermined time T, the current detection information, and the previous detection information, Based on the above, the change rate H is obtained, and it is determined whether or not the obtained change rate H has reached a predetermined value (step S108).

  Subsequently, when the ASIC 111 determines that the rate of change H has reached a predetermined value in step S108, the light intensity (brightness) after the change based on the current detection information continues for a certain time or more. (Step S109), and if it is determined that the light intensity after the change has continued for a certain time or longer, the fact that the rate of change H has reached a predetermined value and the power saving level change information ( In this case, the CPU 112 is notified of information indicating level 2).

  In the process of step S109, in the ASIC 111, as in the case of the process of step S105, the determination unit 30 samples the latest (obtained this time) obtained by sampling the processing unit 20 for a certain time. ), And whether or not the plurality of detection information from the processing unit 20 responding to the request is equivalent to the current detection information used when the change rate H in step S108 is obtained. If it is equal to this, it is determined that the light intensity (brightness) after the change continues for a certain time or more.

  Here, in step S109, it is determined that the light intensity (brightness) after the change continues for a certain time or more, for example, when the lamp 50 is changed from the lighting state to the extinguishing state at time t3. is there. Further, it is determined that the light intensity (brightness) after the change does not continue for a certain period of time or more, for example, when the lamp 50 is in the lighting state, as indicated by the symbol N in FIG. When a person blocks between the light detection unit 10 and the electric lamp 50 of the image forming apparatus 100 as in the change of the light intensity indicated by the eight vertical lines, the brightness changes sharply (brightness Is abruptly changed in a decreasing direction).

  Here, a specific example will be described. For example, when the detection result L4 is obtained as the current detection information at time t3 and the detection result as the previous detection information is the detection result L3, it is determined that the light intensity has changed in a decreasing direction. Therefore, “current detection information (detection result L4) −previous detection information (detection result L3)” is calculated, and a negative light change amount ΔL2 is obtained. Based on the absolute value of the light change amount ΔL2 and the predetermined time T, the change rate H is obtained.

  In this example, since the lamp 50 is shifted from the lighting state to the extinguishing state at the time point t3, it is determined that the rate of change H has reached a predetermined value, and the light intensity (brightness after the change) is further increased. ) Continues for a certain period of time.

  As a result, information indicating that the rate of change H has reached a predetermined value and level 2 as power saving level change information is notified from the ASIC 111 to the CPU 112.

  Then, the CPU 112 changes the power saving state of the image forming apparatus 100 to a power saving level (level 2) higher than the current power saving level (level 1) based on the notification content notified from the ASIC 111 (step S110).

  If it is determined in step S104 that the rate of change H has not reached the predetermined value, if it is determined in step S105 that the light intensity (brightness) after the change has not continued for a certain period of time, If it is determined in S107 that the light intensity has not changed in the decreasing direction (when the light intensity is determined to be constant), the change rate H has not reached the predetermined value in step S108. If it is determined, if it is determined in step S109 that the light intensity (brightness) after the change has not continued for a certain period of time, the process returns to step S102.

  By the way, the CPU 112 has changed the power saving level after the change (level 1) changed in step S106 or the power saving level after change (level 2) changed in step S110 because the CPU 112 itself has changed. It can be recognized. Of course, the CPU 112 stores information indicating the power saving level after the change in the RAM 114, and indicates the power saving level after the change related to the previous power saving level changing process from the RAM 114 during the next power saving level changing process. The information may be read to check the current power saving state of the image forming apparatus 100.

  Next, the power saving level changing process by the CPU 112 will be described with a specific example.

  When level 1 is notified as the power saving level change information, the CPU 112 saves power saving target element information corresponding to the power saving level (level 1) based on the power saving level change information (level 1) included in the notification content notified from the ASIC 111. Is read from the ROM 113, and a predetermined instruction is given to the power supply unit 170 based on the read power saving target element information.

  That is, the CPU 112 informs the power supply unit 170 that (1) the fixing unit 150 is supplied with power so that its rated output (power consumption) is 50%, and (2) the light detection unit 10, The operation panel unit 120, the image forming unit 130, the machine control unit 140, and the driving unit 160 are each supplied with predetermined power (power supply voltage) suitable for the operation of each component. Instruct.

  As a result, the image forming apparatus 100 is in a power saving state as shown in FIG. That is, in the example shown in FIG. 5, the fixing unit 150 is supplied with power so that the rated output (power consumption) is 50%. In contrast, for the light detection unit 10, the operation panel unit 120, the image forming unit 130, the machine control unit 140, and the drive unit 160, predetermined power (power supply voltage) suitable for the operation of the respective components is provided. ) Is supplied.

  On the other hand, when level 2 is notified as the power saving level change information, the CPU 112 saves power corresponding to the power saving level (level 2) based on the power saving level change information (level 2) included in the notification content notified from the ASIC 111. The element information is read from the ROM 113, and a predetermined instruction is given to the power supply unit 170 based on the read power saving target element information.

  That is, the CPU 112 causes the power supply unit 170 to (1) supply the light detection unit 10 with predetermined power (power supply voltage) suitable for its operation, and (2) the controller 110. (3) The operation panel unit 120, the image forming unit 130, the machine control unit 140, the fixing unit 150, and the driving unit 160 are configured to stop supplying power to 50% of the circuits set in advance. Is instructed to stop the power supply.

  As a result, the image forming apparatus 100 is in a power saving state as shown in FIG. That is, in the example illustrated in FIG. 6, the light detection unit 10 is supplied with predetermined power (power supply voltage) suitable for the operation thereof. As for the controller 110, predetermined power (power supply voltage) suitable for the operation of the circuit is supplied to 50% of the circuits set in advance, and the other 50% of the circuits are supplied to the other circuits. In contrast, no power is supplied. Electric power is not supplied to each of the operation panel unit 120, the image forming unit 130, the machine control unit 140, and the drive unit 160.

  In the first embodiment, in the power saving level changing process by the power saving control device 1, the power saving level in the power saving state is changed when the rate of change H is a predetermined value (first predetermined value) or more. The present invention is not limited to this, and when the light change amount ΔL is greater than or equal to a predetermined value (second predetermined value (≠ first predetermined value)), the power saving level in the power saving state is changed. Also good.

  As described above, according to the first embodiment, when the indoor lamp 50 is shifted from the extinguished state to the lit state (when the brightness is in an increasing direction), the brightness change (light Change rate (or amount of change) reaches a predetermined value, the power saving state is changed to a power saving level lower than the current power saving level, and the lamp 50 is switched from the on state to the off state. When transitioned (when the brightness is in the direction of decreasing), the rate of change (or amount of change) in the change in brightness (change in light intensity) reaches the predetermined value, so the power saving state Is changed to a power saving level higher than the current power saving level, the image forming apparatus 100 is optimized according to the rate of change in brightness outside the image forming apparatus 100 (brightness change amount). Can be in power saving state at power saving level

  Therefore, it is possible to reliably reduce the power consumption of the image forming apparatus 100 and save power.

  In addition, when the rate of change (or amount of change) in the change in brightness (change in light intensity) reaches a predetermined value, the power saving level in the power saving state is changed. When the lamp 50 is switched from the lighting state to the extinguishing state without being affected by the brightness change (steep change) due to outside light, etc., the power saving state is changed to a power saving level higher than the current power saving level. can do.

  Further, when the indoor lamp 50 in the office or the like is shifted from the off state to the on state due to working hours (or business start), the power saving state is lower than the current power saving level (level 2 power saving level). Since the level is changed to the level (power saving level of level 1), when using the image forming apparatus 100 in the power saving state of the low power saving level (level 1), the return at the time of printing may be accelerated. The convenience of the image forming apparatus 100 can be improved.

  (Embodiment 2)

  The power saving control device according to Embodiment 2 of the present invention has the same functional configuration as that of the power saving control device of Embodiment 1 shown in FIG. Detailed description is omitted. Further, the image forming apparatus according to the second embodiment has the same configuration as that of the image forming apparatus according to the first embodiment shown in FIG. 3, and therefore detailed description of the configuration is omitted here. To do.

  In the second embodiment, the image forming apparatus 100 shown in FIG. 3 is connected to a client, for example, a computer (not shown) that creates document information, accepts a print request from this computer, and responds to the print request. Print processing to be executed.

  In addition to the functions described in the first embodiment, the CPU 112 has a function of a processing request receiving unit that receives an image forming process request from a client and a function of receiving print data corresponding to the image forming process request. Yes.

  The second embodiment is slightly different from the first embodiment in the function of the control unit 40 of the power saving control device 1. Therefore, the difference will be described in detail.

  The control unit 40 of the power saving control device 1 executes the following power saving level changing processes (5) and (6) in addition to the power saving level changing processes (1) to (4) of the first embodiment. To do.

  (5) When the CPU 112 as the processing request receiving unit receives the image forming processing request, the power saving state is canceled, and after the image forming processing corresponding to the image forming processing request by the image forming unit 130 is completed, before the canceling Return to the power-saving state.

  (5-1) After a predetermined time (predetermined time) has passed after the image forming process by the image forming unit 130 is completed (after the printing process for the print data is completed), the power saving state before the release is restored. A predetermined time which is a condition for returning to the power saving state before the release is defined as T10.

  (5-2) Immediately after the image forming process by the image forming unit 130 is completed (immediately after the printing process for the print data is completed), the power saving state before the release is restored.

  (6) When the electric lamp 50 shifts from the lighting state to the extinguishing state, the image forming apparatus 100 is moved from the power saving state of the first power saving level (corresponding to the power saving level of level 1 in the first embodiment) to the first power saving level. When the power saving state of the second power saving level higher than the level (corresponding to the power saving level of level 2 of the first embodiment) is shifted and the lamp 50 shifts from the unlit state to the lit state, the image forming apparatus 100 is switched to the first The power saving state at the second power saving level is shifted to the power saving state at the first power saving level.

  In the second embodiment, when the image forming process is completed, an image corresponding to the print data is printed on a sheet, and the sheet (image formation output result) is discharged to a sheet discharge unit (discharge tray). It is the time when

  Also in the second embodiment, the detection result of brightness (light intensity) by the light detection unit 10 is the same as that in the first embodiment shown in FIG. 2B, as shown in FIG. 7B. It is the same. Also in this case, the electric lamp 50 is shifted to the on state or the off state at each of the time point t2, the time point t3, the time point 4, and the time point t5.

  As shown in FIG. 7A, the power saving level in the power saving state that is changed according to the change in brightness is the same as that in the first embodiment shown in FIG. The level is changed from level 2 to level 1, from level 1 to level 2 at time t3, from level 2 to level 1 at time t4, and from level 1 to level 2 at time t5.

  In the second embodiment, the power saving level is OFF (the power saving level is OFF, that is, the power saving state is canceled), level 1 (corresponding to the first power saving level, level 1 in the first embodiment), level 2 Assume that there are three levels (second power saving level, corresponding to level 2 in the case of the first embodiment).

  In the following description, “level 1 power saving level” is “power saving level 1”, “level 2 power saving level” is “power saving level 2”, and “power saving level is OFF” is “power saving level OFF”. And

  Here, the power saving level 2 is a mode in which the power consumption is the smallest among the three levels, but it takes time to recover. Power saving level 1 is a mode in which power consumption is larger than power saving level 2, but the recovery time is short. Further, although the power consumption is the highest among the three levels when the power saving level is OFF, printing can be performed immediately after receiving a print request (print data).

  By the way, in the image forming apparatus 100 shown in FIG. 3, the controller 110 has a timer (not shown) for measuring time, and the CPU 112 performs the above-described change processing (5-1). When the image forming process by the image forming unit 130 is completed, the timer is started, and when the result (time) counted by the timer reaches a predetermined time T10, the power saving state before the release is restored. .

  Next, when the image forming apparatus 100 receives a print request during the lighting state period T2 in which the lamp 50 is in the lighting state, printing is performed during the extinguishing state period T3 in which the lamp 50 is in the off state. The power saving control of the power saving control device 1 when a request is received will be described in detail with reference to FIGS.

  FIG. 8 is an enlarged view of the dotted line portion indicated by reference symbol A in FIG. 7, FIG. 9 is a flowchart showing the processing operation of the power saving level changing process by the power saving control device 1, and FIG. It is a flowchart which shows the processing operation | movement of the change process of a power-saving level when implemented.

  As shown in FIG. 9, the light detection unit 10 detects (measures) the brightness outside the image forming apparatus 100, that is, the light intensity (step S201). In this case, the light detection unit 10 converts the detection result into an electrical signal corresponding to the detection level value as the detection result, and outputs this to the controller 110 as detection information.

  In the controller 110, the CPU 112 determines whether or not a print request transmitted from the client (computer) has been received (step S202).

  If it is determined in step S202 that the print request has not been received by the CPU 112, processing similar to the processing in steps S102 to S110 in the processing procedure of the first embodiment shown in FIG. 4 is executed (step S203). ~ S211).

  In step S207, the power saving level is changed to a power saving level 1 lower than the power saving level 2 (current power saving level). That is, the CPU 112 sets the power saving state to the power saving level 1. In step S211, the power saving level is changed to a power saving level 2 higher than the power saving level 1 (current power saving level). That is, the CPU 112 sets the power saving state to the power saving level 2.

  If it is determined in step S202 that the CPU 112 has received a print request, the image forming apparatus 100 performs print processing (step S212), and then proceeds to step S203.

  Also in the second embodiment, when level 1 is notified as the power saving level change information from the ASIC 111 to the CPU 112, the power saving state of the image forming apparatus 100 becomes the content shown in FIG. 5, while the power saving level from the ASIC 111 to the CPU 112. When level 2 is notified as the change information, the power saving state of the image forming apparatus 100 is as shown in FIG.

  Next, the power saving level changing process when the printing process of step S212 is executed will be described with reference to FIG. 8 and FIG.

  Here, as shown in FIG. 8, the print data D1 corresponding to the first print request at time t21, the print data D2 corresponding to the second print request at time t22, and the third print request at time t24. Assume that the print data D3 corresponding to the print data D4 corresponding to the fourth print request at the time 31 is received.

  When the CPU 112 receives a print request in step S202 (see FIG. 9) and further receives print data corresponding to the print request, the CPU 112 saves the power saving level set in step S207 or step S211 as shown in FIG. When determining the current power saving level (power saving level 1 or power saving level 2) of the power saving state of the image forming apparatus 100 based on (power saving level 1 or power saving level 2) (step S301). Cancels the power saving state (releases the power saving level 1, that is, sets the power saving level OFF) (step S302).

  When the power saving state is released in this way, the image forming unit 130 performs a printing process (step S303).

  Next, the CPU 112 determines whether or not the printing process has been completed (step S304). If the result of this determination is that the printing process has not been completed, the CPU 112 waits until the printing process is completed. When the process is completed, a timer is started and the timer is monitored to determine whether or not a predetermined time T10 has elapsed since the end of the print process (step S305).

  If the CPU 112 determines in step S305 that the predetermined time T10 has not elapsed since the end of the printing process, the CPU 112 determines whether or not the next print request has been received (step S306). When the next print request is received, the process returns to step S303 to execute the print process, and when the next print request is not received, the process returns to step S305.

  When the CPU 112 determines in step S305 that the predetermined time T10 has elapsed since the end of the printing process, the CPU 112 returns to the power saving state before the release, that is, sets the power saving state at the power saving level 1 (step S307). Thereafter, the process returns to the process of FIG.

  By the way, the CPU 112 that has determined that the power saving level is the power saving level 2 in step S301 cancels the power saving state (cancels the power saving level 2, that is, sets the power saving level OFF) (step S308).

  When the power saving state is released in this manner, the image forming unit 130 performs a printing process (step S309).

  Next, the CPU 112 determines whether or not the printing process has been completed (step S310). If the result of this determination is that the printing process has not been completed, the CPU 112 waits until the printing process is completed. When the process is finished, the power saving state before the release is restored immediately after the printing process is finished, that is, the power saving state is set to the power saving level 2 (step S311), and then the process returns to the process of FIG.

  Here, a specific example will be described. First, the power saving level changing process when a print request is received in the lighting state period T2 will be described.

  As shown in FIG. 8, when print data D1 corresponding to the first print request is received at time t21, the power saving level is set from the power saving level 1 to the power saving level OFF, that is, the power saving state is canceled, and the print data D1 Is executed.

  When the printing process for the print data D1 is completed, the next time when the predetermined time T10, which is a condition for returning to the power saving state before the release, has not elapsed since the printing process was completed, for example, at the next time point 22, When the print data D2 corresponding to the second print request is received, the power saving state remains released, and the print process for the print data D2 is executed.

  When the printing process for the print data D2 is completed, the power saving state before the release, that is, the power saving level 1 is restored at the time t23 when the predetermined time T10 has elapsed from the time when the printing process was completed.

  When the print data D3 corresponding to the next third print request is received at time t24 in the restored power saving level 1 power saving state, the power saving state is canceled and print processing for the print data D3 is performed. Is executed. Thereafter, when the printing process for the print data D3 is completed, the power-saving state before the release, that is, the power-saving level 1 is restored at the time t25 when the predetermined time T10 has elapsed from the time when the printing process was completed.

  Next, the power saving level changing process when a print request is received in the light-off state period T3 will be described.

  As shown in FIG. 8, when print data D4 corresponding to the fourth print request is received at time t31, the power saving level is set from the power saving level 2 to the power saving level OFF, that is, the power saving state is canceled, and the print data D4 Is executed.

  When the print process for the print data D4 is completed, the power-saving state before the release, that is, the power-saving level 2 is restored when the print process is completed.

  As described above, according to the second embodiment, when there is a print request when the lamp 50 is in the lighting state as in the lighting state period T2, the power saving state of the power saving level 1 is canceled (the power saving level). After the printing process is completed, after a predetermined time T10 has elapsed, the power saving state before the release (power saving level 1 power saving state) is restored. Therefore, power consumption can be reduced.

  In addition, when there is a print request when the lamp 50 is in the off state as in the off state period T3, it is treated as an irregular print job, and after the power saving state of the power saving level 2 is canceled (power saving level OFF), Since the printing process is executed and the printing process is completed, the power saving state before the release (the power saving state of power saving level 2) is immediately restored, so that the power consumption can be reduced.

  The present invention can be applied to a power saving control device that performs power saving control on an electronic device that achieves power saving, and an electronic device having the power saving control device.

3 is a functional block diagram illustrating a functional configuration of the power saving control device according to Embodiment 1. FIG. FIG. 10 is a diagram for explaining a power saving level changing process in a power saving state by the power saving control device according to the first embodiment. 1 is a configuration diagram showing a main configuration of an image forming apparatus having a power saving control device according to Embodiment 1. FIG. 4 is a flowchart illustrating a processing procedure of power saving level change processing by the power saving control device according to the first embodiment. FIG. 3 is a diagram illustrating a state of a power saving state (level 1 power saving level) of the image forming apparatus according to the first embodiment. FIG. 3 is a diagram illustrating a state of a power saving state (a power saving level of level 2) of the image forming apparatus according to the first embodiment. FIG. 10 is a diagram illustrating a power saving level change process by the power saving control device according to the second embodiment. FIG. 8 is an enlarged view of a dotted line portion indicated by a symbol A in FIG. 7, illustrating a power saving level changing process when print data is received in a power saving state. 10 is a flowchart illustrating a processing operation of a power saving level changing process performed by the power saving control device according to the second embodiment. 10 is a flowchart illustrating a processing operation of a power saving level changing process (a changing process when a printing process is performed) performed by the power saving control device according to the second embodiment.

Explanation of symbols

1 Power-saving control device 10 Light detection part (detection means)
20 processing unit (processing means)
30 Discriminator (discriminating means)
40 Control unit (control means)
50 Electric light (lighting means)
100 image forming apparatus 110 controller 111 ASIC (processing means, discrimination means)
112 CPU (control means, processing request accepting means)
113 ROM
114 RAM
120 Operation Panel 130 Image Forming Unit (Image Forming Unit)
140 Machine Control Unit 150 Fixing Unit 160 Drive Unit 170 Power Supply Unit

Claims (7)

A power saving control device that is provided in a predetermined device and performs power saving control for reducing power consumption of the predetermined device,
Detecting means for detecting brightness outside the predetermined device;
Processing means for determining the amount of change in brightness detected by the detection means per predetermined time;
Determination means for determining that the amount of change obtained by the processing means has reached a predetermined value;
When it is determined by the determining means that the amount of change has reached the predetermined value, the power saving level of the power saving state for reducing the power consumption for the predetermined device is changed, and the power saving after the change is made. Control means for performing power saving control for the predetermined device based on a level;
A power saving control device comprising: The control means includes
If the amount of change is based on a change in the direction of increasing brightness, change the power saving state to a power saving level lower than the current power saving level,
If the amount of change is based on a change in the direction of decreasing brightness, change the power saving state to a power saving level higher than the current power saving level,
The power saving control apparatus according to claim 1. The control means includes
When the amount of change is based on a steep change in the direction of increasing brightness,
When the brightness after the change due to the steep change continues for a certain time, the power saving state is changed to a power saving level lower than the current power saving level,
When the brightness after the change due to the steep change is not continued for the predetermined time, the power saving state is maintained at the current power saving level, and
When the amount of change is based on a steep change in the direction of decreasing brightness,
When the brightness after the change due to the steep change continues for the predetermined time, the power saving state is changed to a power saving level higher than the current power saving level,
When the brightness after the change due to the steep change is not continued for the predetermined time, the power saving state is maintained at the current power saving level.
The power saving control device according to claim 1 or 2, The control means includes
When the lighting means in the room where the predetermined device is arranged shifts from the lighting state to the extinguishing state, the predetermined device is moved from the power saving state at the first power saving level to the second power level higher than the first power saving level. Shift to the power saving state at the power saving level,
When the lighting means shifts from the off state to the lighting state, the predetermined device is shifted from the power saving state at the second power saving level to the power saving state at the first power saving level.
The power saving control device according to claim 1, wherein the power saving control device is a power saving control device.   An image forming apparatus comprising the power saving control device according to claim 1. Processing request receiving means for receiving an image forming processing request from a client;
An image forming unit that executes an image forming process corresponding to the image forming process request received by the processing request receiving unit;
The control means of the power saving control device is:
When the processing request accepting unit accepts the image forming processing request, the power saving state is canceled, and after the image forming process corresponding to the image forming processing request by the image forming unit is completed, the power saving state before the canceling is entered. return,
The image forming apparatus according to claim 5. The control means includes
When the image forming process by the image forming unit is completed and the predetermined time has elapsed from the end, the power saving state before the release is restored, or immediately after the image forming process by the image forming unit is completed before the release. Return to the power-saving state of
The image forming apparatus according to claim 6.

Images