JPH06148972A - Power source device - Google Patents

Abstract

PURPOSE:To provide the power source device of an image forming device with good operation convenience and a power saving mode by constituting the device so that shift to a power source interrupting state from a power saving state or the turning-on of the power source from the interrupting state is properly executed according to an environment. CONSTITUTION:A human body detection sensor as a human body detection means is disposed at the front surface part of a control panel. When an operator approaches a copying machine, it is detected and inputted to a CPU. A DC power source circuit PWDC is connected to a commercial AC power source through a main switch incorporating two circuits of switches MS1 and MS2. An AC control circuit is connected to a commercial power source through a power source relay RA1. Then, an action state that an image is formed, a standby state until the shift to the action state, and the power saving state that power consumption is restrained are provided. When a human being is not detected in front of an image forming device by the human being detection means in the standby state, the standby state is shifted to the power saving state. When the power saving state is continued for a prescribed time, power supply to the image forming device is interrupted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device for an image forming apparatus.

[0002]

2. Description of the Related Art Conventionally, various power supply devices for image forming apparatuses have been proposed. For example, it is known that in an image recording apparatus, when the power switch is off, the power supply to the load is stopped and the power supply to the control means is continued, thereby eliminating the need to set the data when the power is turned on again. (JP-A-62-0785576). In addition, in the control device of the copying machine, a sensor for detecting the presence of the user is provided on the front side of the copying machine, and the output of this sensor is used to control ON / OFF of the preheating mode, without pressing the preheating key. Can also switch to or release the preheat mode, which saves labor and reduces the number of key operations during copying.
No. -029145). Also, in the control device of the copying machine,
It has a weekly timer, and when the preset power-off time comes, it is controlled to turn off the power when the machine is not used for a certain period from that time, so that copying is interrupted due to a jam. Power is off during
It is also known to prevent the occurrence of the phenomenon (JP-A-63-1).
21864).

If the control device of the copying machine has a weekly timer and there is a copying operation or an OFF prohibition condition, the power-off operation at the set OFF time is performed after the copying operation ends or when the OFF prohibition condition is released. As a result, there is also known one which prevents the power supply from being turned off during the interruption of copying due to a jam or the like (Japanese Patent Laid-Open No. 63-121865).

Further, the image forming apparatus is provided with an illuminance sensor or the like, and the illuminance sensor detects the illuminance of the surroundings to keep the load function of the apparatus main body operating during the daytime or the time when the illumination is turned on. In some cases, the load function is automatically stopped during the operating period to reduce the power consumption (Japanese Patent Laid-Open No. 63-293559). In addition, in the energization control device in the image forming apparatus,
It has a first timer means for automatically turning off the power when a copying operation or an operation is not performed for a predetermined time, and a second timer for delaying the power-off operation by the timer for a predetermined time. It prevents unnecessary power consumption due to forgetting to turn off the switch, and the timer goes off during operation to turn off the power.
There are also things to prevent being FF (Actual Kaihei 1-0346)
34 publication). Further, in the image forming apparatus, power is supplied by the addition of the timer switch to start the image forming sequence, and after completion, the power is supplied by the timer switch operation.
There is also one that is FFed to save power and prevent danger (Japanese Utility Model Laid-Open No. 1-038641). Further, some image forming apparatuses are provided with a time measuring means and a power saving mode start time setting means in the image forming apparatus so that the power saving mode can be automatically set (JP-A-2-129658).

As described above, the copying machine has become multifunctional year by year, the human body detection is installed, and when the copy user leaves the copying machine after the copying is completed, the display is automatically turned off to lower the set temperature of the fixing heater. A so-called power saving mode for saving power consumption has been developed, and a function is added that automatically returns from the power saving mode to the copy mode when a user approaches.

However, the power saving mode function as described above is an excellent function for the user from the viewpoint of operability in view of energy saving, but in this power saving mode, all the display is turned off except a part of the display. At first glance, it looks as if the power is off, and the final copy user of the day may inadvertently forget to turn off the power. Also, turning on the power every morning and turning off the power every night is troublesome.For example, if the user forgets to turn on the power in the morning, the first user has a long waiting time, and if he forgets to turn off the power at night, power is uselessly consumed. Moreover, there is concern that an unexpected accident may occur because the power system is connected.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a power supply unit for an image forming apparatus having a power saving mode that is more convenient to use.

[0008]

To achieve the above object, the first invention of the present application is to form an image having an operating state for forming an image, a standby state until the transition to the operating state, and a power saving state for suppressing power consumption. In the power supply device of the apparatus, a human body detection unit that detects a human body in front of the image forming apparatus, and when the human body detection unit does not detect a human body in the standby state, shifts to a power saving state, and the power saving state is further changed. And a power supply control means for shutting off power supply to the image forming apparatus when the image forming apparatus has continued for a predetermined time. Also,
According to a second aspect of the present invention, in a power supply device of an image forming apparatus having an operation state in which image formation is performed, a standby state until transition to the operation state, and a power saving state in which power consumption is suppressed, A human body detection unit that detects a human body on the front surface, a light amount detection unit that detects the amount of light in the upper surface direction of the image forming apparatus, and if no human body is detected by the human body detection unit in the standby state, shift to a power saving state. And a power supply control means for shutting off the power supply to the image forming apparatus when the light quantity detected by the light quantity detection means falls below a predetermined value in the power saving state. .

Further, according to a third aspect of the present invention, in a power supply device of an image forming apparatus for forming an image, a light amount detecting means for detecting a light amount in the upper surface direction of the image forming apparatus, and a light amount detected by the light amount detecting means. Is less than a predetermined value, the power supply shutoff means for shutting off the power supply to the image forming apparatus, and the light amount detected by the light amount detecting means when the image forming apparatus is in the power cutoff state have a predetermined value. And a power supply means for supplying electric power to the image forming apparatus. According to a fourth aspect of the present invention, in a power supply device of an image forming apparatus that forms an image, a light amount detecting unit that detects a light amount in the upper surface direction of the image forming apparatus and a light amount detected by the light amount detecting unit have a predetermined value. Power supply cutoff means for cutting off the supply of electric power to the image forming apparatus, and the light quantity detected by the light quantity detecting means when the image forming apparatus is in the power cutoff state exceeds a predetermined value. Occasionally, power supply means for supplying power to the image forming apparatus, and power-off-time power supply means for supplying power to the light amount detection means and the power supply means when power supply is cut off by the power cut-off means. It is characterized by including.

A fifth aspect of the present invention is, in a power supply device of an image forming apparatus for forming an image, a light amount detecting means for detecting a light amount in the upper surface direction of the image forming apparatus, and a light amount detected by the light amount detecting means. Is below a predetermined value, the power supply cutoff means for cutting off the supply of electric power to the image forming apparatus, and the light amount detection means provided with a solar cell when the image forming apparatus is in the electric power cutoff state. When the light amount exceeds a predetermined value, a power supply means for supplying power to the image forming apparatus with the power from the solar cell, and the light amount detection means when the power supply is cut off by the power cutoff means. The power supply means for supplying power to the power supply means is provided. Also,
According to a sixth aspect of the present invention, in a power supply device of an image forming apparatus having an operation state in which image formation is performed, a standby state until transition to the operation state, and a power saving state in which power consumption is suppressed, The light amount detecting means for detecting the amount of light in the upper surface direction, the power shutoff means for shutting off the power supply to the image forming apparatus when the light amount detected by the light amount detecting means falls below a predetermined value, and the image forming apparatus. And a power supply unit for supplying power to the image forming apparatus and for putting the image forming apparatus into a power saving state when the light amount detected by the light amount detecting unit exceeds a predetermined value in the power cutoff state. It is characterized by doing.

Further, according to a seventh aspect of the present invention, in a power supply device of an image forming apparatus for forming an image, a light amount detecting means for detecting a light amount in the upper surface direction of the image forming apparatus, and a light amount detecting means for detecting the light amount. A changing unit that appropriately changes the threshold value to an arbitrary value, and a power shutoff unit that shuts off the power supply to the image forming apparatus when the light amount detected by the light amount detecting unit falls below a predetermined value by the changing unit, A power supply means for supplying power to the image forming apparatus when the light quantity detected by the light quantity detecting means exceeds a predetermined value by the changing means when the image forming apparatus is in a power cutoff state. It is characterized by doing. Also,
An eighth invention of the present application is, in a power supply device of an image forming apparatus for forming an image, a light amount detecting means for detecting a light amount in the upper surface direction of the image forming apparatus, and a threshold value for detection by the light amount detecting means at predetermined intervals. Change means for appropriately changing the light quantity change ratio to an arbitrary value based on a judgment reference, and supply of power to the image forming apparatus when the light quantity detected by the light quantity detecting means falls below a predetermined value by the changing means. And a power shutoff means for shutting off the power, and power is supplied to the image forming apparatus when the light quantity detected by the light quantity detecting means exceeds the predetermined value by the changing means when the image forming apparatus is in the power cutoff state. And a power supply unit that operates. Further, the ninth invention of the present application is such that a light amount detecting means for detecting the light amount in the upper surface direction and a threshold for detection by the light amount detecting means are appropriately changed to an arbitrary value with reference to the continuity of a predetermined period as a criterion. Means, a power shutoff means for shutting off the power supply to the image forming apparatus when the light quantity detected by the light quantity detecting means falls below a predetermined value by the changing means, and the image forming apparatus is in a power cutoff state. It is characterized by further comprising power supply means for supplying electric power to the image forming apparatus when the light quantity detected by the light quantity detecting means exceeds a predetermined value by the changing means at a certain time.

The invention of the present application having the above-described configuration has the following operation. The power supply device of the first invention of the present application has an operation state in which image formation is performed, a standby state until the transition to the operation state, and a power saving state in which power consumption is suppressed, and human body detection is performed in the standby state. When the means does not detect a human body on the front surface of the image forming apparatus, the power saving state is entered, and when the power saving state continues for a predetermined time, the power supply to the image forming apparatus is cut off to perform a final operation in the power saving state. Even if a person forgets to turn off the power, the power is automatically cut off after a predetermined time, so that the power is prevented from being wasted all the time. In the power supply device of the second invention of the present application, most of the places where the image forming apparatus, such as a copying machine, is installed are indoors, and the ambient conditions used are that the department is working, that is, the room lighting is on. It is assumed that this is the case. That is, when the predetermined time is measured by the timer or the like, the power is automatically turned off when the predetermined time comes even during working hours, so for the user who comes after the predetermined time, the power is turned on again before use. It must be done and the operability is poor. Therefore, in the power supply device of the second invention of the present application, the ambient brightness is detected, and the power is turned off when it is determined that it is darker than a certain reference, that is, the end user of the room turns off the illumination of the room. did. Therefore, the operability for the copy user is improved.

The power supply device of the third invention of the present application supplies power to the image forming apparatus when the light amount detected by the light amount detecting means exceeds a predetermined value when the image forming apparatus is in the power cutoff state. By doing so, the power of the copying machine is automatically turned on every morning when the user of the room turns on the illumination of the room, so that the copying user can make a copy without waiting time. In the power supply device of the fourth invention of the present application, when the power supply is cut off by the power supply cutoff means, the light quantity detection means and the power supply means are supplied with power, for example, by a battery, so that the light quantity exceeds a predetermined value. The power can be turned on when it is turned around, and the power is supplied only to the circuits that consume less power, so that the power consumption can be reduced. As a result, all circuits are disconnected from the commercial power source, and there is no risk of danger due to a power control system trouble.

The power supply device according to the fifth aspect of the present invention is provided with a solar cell so as to use the solar cell as a power-on trigger, thereby making the CPU inoperable and further ensuring safety and maintaining the life of the battery. The effect is enhanced. Also, at this time, while the power is cut off, the power is automatically retained by the battery only in the power source automatic restoration unit consisting of the light amount detection unit and the power supply unit, and after the power is turned on, the battery is disconnected from the power source automatic restoration unit. Alternatively, it may be charged from a DC power supply. That is, when the power is cut off, the battery is maintained, and when the power is restored, the direct current power source is used for charging, which enhances the effect of maintaining the life of the battery. A power supply device of a sixth invention of the present application supplies power to the image forming apparatus and puts the image forming apparatus into a power saving state when the light amount detected by the light amount detecting means exceeds a predetermined value.
As a result, when the power is automatically turned on, the power saving mode can be maintained, and there is an effect of preventing waste of power consumption even when there is no user immediately.

In the power supply device of the seventh invention of the present application, the installation environment of the copying machine has a large difference, and if the operation level of the light amount detection is fixed, the installation condition is limited to a narrow range. The salesman, the serviceman, the user, etc. can appropriately change the threshold value at the time of detection by the light amount detecting means to an arbitrary value so that the optimum level can be easily set in the installation environment. I chose In the power supply device of the eighth invention of the present application, if the period when the copying machine is used is considered to be the period when the indoor illumination is on, the difference between the time when the illumination is turned on at night and the time when the illumination is turned off during the sunny day is small, The range of application is narrow when detecting with an absolute value.
Therefore, by making it possible to appropriately change the threshold value at the time of detection by the light amount detection means to any value based on the change ratio of the light amount for each predetermined period as a criterion, when viewing the light amount change rate for each certain period. Is neglected because the change in the light amount due to the natural environment such as the weather and the sunshine is slow, and the change in the light amount when the indoor lighting is turned on and off can be easily detected, and the detection reliability can be improved. The power supply device of the ninth invention of the present application appropriately changes the threshold value at the time of detection by the light amount detection means to an arbitrary value with reference to the continuity of a predetermined period, and cuts off the power supply when the value falls below the predetermined value. However, when the predetermined value is exceeded, electric power is supplied to provide continuity for a certain period in detecting a change in light amount when the automatic power is turned off and when the automatic power is turned on, flickering when indoor lighting is turned on, and Shadow,
The effect of noise that changes temporarily, such as the shadow of a document, is eliminated to improve the stability of operation.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described below with reference to the drawings. Here, FIG. 1 is a block diagram showing a configuration of a power supply device of the image forming apparatus according to the present invention, and FIG.
FIG. 3 is a perspective view showing an external appearance of a copying machine of an embodiment of an image forming apparatus in which the power supply device shown in FIG. 3 is adopted, and FIG. 3 is a block diagram showing a configuration of a microcomputer for controlling the power supply device shown in FIG. Is. First, referring to FIG.
On the upper surface of the image forming apparatus (copier) 1, contact glass (transparent glass for mounting), on which an object to be copied (original etc.) is mounted, is provided, and this contact glass is covered by the pressure plate 3. Further, on the front surface of the pressure plate 3, there is provided an operation panel 5 on which various operation keys and a display section are appropriately arranged. The front side of the copying machine 1 below the operation panel 5 is covered with a front cover 7, and the inside of the copying machine can be easily inspected by opening the front cover 7. Further, a plurality of paper feed cassettes 9 for accommodating papers of various sizes are arranged on the side surface. further,
A human body (object) detection sensor C1 as human body detection means is provided on the front surface of the operation panel 5. When a copy operator approaches the copying machine 1, the sensor is detected and the upper portion of the operation panel 5 is detected. Is an illuminance sensor C2 as a light amount detecting means for detecting brightness around the copying machine 1 (especially in the upward direction).
Is provided so that it can be detected that the indoor lighting is turned off or turned on.

FIG. 3 is a block diagram of a microcomputer for performing various controls in this embodiment. Less than,
Its configuration will be briefly described together with its operation. Operation board key switch group 1 provided inside the operation panel 5
The instruction or control signal input from 1 is stored in the buffer 13
Is input to the CPU 15 via. Similarly, the detection signals of the state detection sensors 17 for detecting the internal state of the copying machine 1 are also input to the CPU 15. The state detection sensors 17 include, in addition to the human body detection sensor C1 and the illuminance sensor C2, a sensor that detects the presence or absence or position of a transfer target sheet that is fed or discharged, a sensor that detects the temperature of a fixing device, and the like. There is. Further, the pulse oscillator 19 outputs a synchronization signal to the CPU 15 in synchronization with the rotation cycle of the photosensitive drum. These signal data input to the CPU 15 are temporarily stored in the RAM 23 via the bus 21 or the RAM 2
3. Various data stored in the ROM 25 are referenced,
Control signals are output from the CPU 15 to the plurality of drivers 29 via the I / O & buffer 27. An operation board display element 31, a mechanical drive system 33, an exposure system, a charging system 35, a paper supply system 37, a fixing system 39 or a peripheral device system 41 are connected to the plurality of drivers 29, respectively.
The driven system corresponding to the control signal is appropriately driven by the driver 29.

Next, the configuration of the power supply device according to this embodiment will be described with reference to FIG. The DC power supply circuit PWDC is connected to the commercial AC power supply via a main switch that incorporates two switches MS1 and MS2, and the AC control circuit (especially the power system circuit) is connected to the commercial power supply via a power relay RA1. Has been done. This main switch is switch MS1
And the switch MS2, the lever operation is a two-step toggle configuration, and the switch MS1 is a push-on operation.

The operation of the main switch having the two-circuit, two-stage toggle structure used in the power supply device shown in FIG. 1 will now be described with reference to FIG. In the initial state of FIG. 4A, both the switches MS1 and MS2 are off and the switch is off. First, when the lever is set to the first stage (FIG. 4B), the contact of the switch MS2 is connected, but the contact of the switch MS1 remains open. Next, when the second stage is set (FIG. 4 (c)), the switch MS
2, the contact of the switch MS1 is also connected while the connection (ON) state is maintained.

Therefore, the commercial AC power supply is supplied to the DC power supply circuit PWDC, and the AC / D is supplied in the DC power supply circuit PWDC.
DC power is generated by C conversion and supplied to a microcomputer (CPU). The control by the microcomputer is started by the supply of the DC power. As a result, the power relay RA1 operates, the contact RA1 is closed, and the commercial AC power supply is connected to the heater H and an AC drive circuit described later. Now let go of the lever (Fig. 4
(D)) The spring force returns the lever to the first step, and the contact of the switch MS1 is released. However, since the relay contact RA1 is in the closed state and the switch MS2 is still in the connected state, power is supplied to the DC power supply circuit and the self-holding state is established. Further, power is supplied to the AC drive circuit via the relay contact RA1, and the fixing heater H
Is activated and shifts to the power saving mode. Further, when the lever is returned to the off position (FIG. 4 (a)), the contact of the switch MS2 is also released, and the DC power supply circuit is released from the self-holding state and is in the completely released state. The self-holding is also released when the power relay is turned off by the control routine described later in the self-holding state. In this case, however, since the contact of the switch MS2 is in the conducting state, the trigger relay can automatically turn on the power. . FIG. 5 shows the operation of the main switch when using the auto shut-off timer, and FIG. 6 shows the operation of the main switch when using the light amount detection.

FIG. 7 shows an example of an automatic power restoration circuit. Even if the DC power source is turned off, the CPU and the automatic power restoration unit keep the power supply by the battery B, and the ambient brightness by the illuminance sensor C2 is constantly maintained. It is possible to monitor the height. When the brightness of the room becomes higher than the reference, the trigger relay is operated and the DC power supply is self-held according to the flow chart showing the power recovery operation of the power supply device shown in FIG. When the DC power supply is activated, the battery is charged by the power supply.

FIG. 8 shows another example of the automatic power recovery circuit.
The solar cell absorbs the illumination light around the copying machine (upper part), amplifies the electromotive force, operates the trigger relay, and maintains the DC power supply itself. When the DC power supply circuit is in the OFF state, the circuit of this automatic power recovery unit is maintained by the battery B, but once the DC power supply is activated, the relay RA3 releases the battery from the recovery circuit and charges it from the DC power supply. It is supposed to be done.

FIG. 9 is an example of a flow chart for explaining the operation in the automatic power-off control. In the standby mode (when copying can start immediately), if human body detection is off (there are no copy users) (step A1), power saving mode (energy saving mode in which the fixing heater control temperature is lowered and the displays are also turned off) When the predetermined time Ts has elapsed (step A7), the power relay RA1 is turned off (step A9) to release the self-holding state (step A11). If the human body detection is turned on (step A1) while the timer Ts is counting, the power saving mode is shifted to the standby mode (step A17).

FIG. 10 is another example of a flowchart for explaining the operation at the time of automatic power-off control. Human body detection is off in the standby mode (step B3) (step B
In the case of 1), the power saving mode (step B5) is entered, and the light quantity around the machine is lower than the reference value (step B7).
Then, the power relay is turned off (steps B9 and B11) to release the self-holding.

Next, with reference to the flow chart of FIG. 11, the operation at the time of power recovery in the configuration shown in FIG. 1 will be described. When the light amount detection is on (step C5) in the automatic mode (step C1) and the power off mode (flag set when the power is automatically cut off) (step C5), the trigger relay is turned on (step C7). At the same time, the power-on routine is started.

Next, the operation for detecting and determining the amount of light around the machine will be described with reference to the flowchart of FIG. Light receiving data such as illumination light is read by the light receiving element provided on the upper surface of the operation panel 5 or the like (step D1), and the absolute value is compared with the light portion reference value, and if it is larger than the reference value, it is determined to be bright (working). Then, the light amount detection is turned on (step D13), and if it is smaller than the reference value of the dark area, it is judged to be dark (out of work) and the light amount detection is turned off (step D).
23) Furthermore, in order to prevent erroneous detection due to noise, shadows of people, shadows of documents such as manuscripts, etc., the continuity is determined for a predetermined time when data is inverted.

Next, another example of the operation for detecting and determining the light amount around the machine will be described with reference to the flowchart of FIG. Illuminance sensor C provided on the upper surface of the operation panel 5 or the like
The received light data such as illumination light is periodically read by step 2 (steps E3 and E5), the ratio with the received light data one time before is calculated (step E9), and the value is compared with the reference value and is larger than the reference value. If the current data is larger than the current data, it is judged to be brighter (starting work) and the light amount detection is turned on. If the previous data is larger, it is judged to be darker (working end) and the light amount detection is detected. Off (step E3
3) Let it go. In order to prevent erroneous detection due to noise, shadows of people, shadows of documents such as manuscripts, etc., the continuity is determined for a predetermined time (step E1) when the data is inverted.

Next, the operation for setting the reference level of the light quantity corresponding to FIG. 12 will be described with reference to the flowchart of FIG. First, the lighting in the room where the copying machine is installed is turned on, and the light amount adjustment mode set by the DIP switch or the special key operation from the operation unit is set to the bright area detection mode (step F1) (key). The light receiving data P1 at this time is stored in the memory MP1 (step F3), the indoor illumination is turned off, and the light amount adjustment mode is set to the dark part detection mode (step F5). The received light data P2 is stored in the memory MP2 (step F7). After that, if the light amount adjustment mode is set to the level setting mode (step F9), the reference level is calculated from the two data and stored in the memories MP1 and MP2 (step F15).
When either the data of P1 or P2 in the level setting mode is 0 (step F11) or the ratio of each data is out of the reference range (step F13), the automatic power supply operation mode is turned off (step F17). Then, a message to that effect is displayed on the operation unit.

Next, the operation for setting the reference level of the light quantity corresponding to FIG. 13 will be described with reference to FIG. First, turn on the lighting in the room where the copier is installed,
The light amount adjustment mode set by the DIP switch or the special key operation from the operation panel 5 is set to the bright part detection mode (step G1) (set only while the key is pressed), and the received light data P1 at this time is stored in the memory MP1. Store (step G3). Next, the indoor lighting is turned off, and the light amount adjustment mode is set to the dark part detection mode (step G5).
Then, the received light data P2 at this time is stored in the memory MP2 (step G7). After that, if the light amount adjustment mode is set to the level setting mode (step G9), the reference level is calculated from the two data and stored in the memory MP1 and the memory MP2 (step G13). When either the received light data P1 or the received light data P2 in the level setting mode is 0 or the ratio of each data is out of the reference range, the automatic power supply operation mode is turned off (step G15). Display on the operation unit.

Next, the operation when the power is turned on will be described with reference to the flowchart of FIG. After performing the initial setting process (step H1) and turning on the power relay (step H5) and self-holding the power supply unit, if the trigger relay is on, the power is automatically turned off (step H7,
H9), the power saving mode is entered (step H11) 1, and the relay is turned off.

Next, the operation in the power saving mode will be described with reference to the flowchart of FIG. First, in the power saving mode (step I1), if the trigger relay is on (step I3), the trigger relay is turned off after waiting for the self-holding period by the relay contact RA1 (step I13), and then in the power saving mode. The display indicating that there is a light is turned on (step I9), all the other displays are turned off (step I11), and the heater temperature is controlled (steps I5 and I7) at a set temperature lower than usual.

[0032]

As described above, according to the present invention, the transition from the power saving state to the power cutoff state or the turning on of the power from the power cutoff state is appropriately performed according to the surrounding environment, so that the power supply device is easy to use. Could be excellent.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a power supply device of an image forming apparatus of the present invention.

FIG. 2 is a perspective view showing the external appearance of a copying machine that employs the power supply device shown in FIG.

FIG. 3 is a block diagram showing a configuration of a microcomputer that controls the power supply device shown in FIG.

4A to 4D are diagrams for explaining the operation of a main switch having a two-circuit, two-stage toggle structure used in the power supply device shown in FIG. 1.

FIG. 5 is a diagram for explaining the operation of the main switch shown in FIG. 4 when the auto shut-off timer is used.

FIG. 6 is a diagram for explaining the operation of the main switch shown in FIG. 4 when using light amount detection.

FIG. 7 is a circuit diagram showing a configuration of an automatic power recovery circuit.

FIG. 8 is a circuit diagram showing another configuration of an automatic power recovery circuit.

FIG. 9 is a flowchart for explaining the operation of automatic power-off control.

FIG. 10 is a flowchart for explaining an operation in another example of the automatic power shutoff control.

FIG. 11 is a flowchart for explaining a power recovery operation of the power supply device shown in FIG.

FIG. 12 is a flowchart for explaining an operation when detecting and determining the light amount around the machine.

FIG. 13 is a flowchart for explaining an operation in another example when detecting and determining the light amount around the machine.

FIG. 14 is a flow chart for explaining the operation when setting the reference level of the light amount in FIG.

FIG. 15 is a flowchart for explaining an operation when setting the reference level of the light amount in FIG.

FIG. 16 is a flowchart for explaining the operation when the power is turned on.

FIG. 17 is a flowchart for explaining the operation in the power saving mode.

[Explanation of reference numerals] 1 image forming apparatus, 3 pressure plate, 5 operation panel,
7 front cover, 9 paper feed cassette, 11 operation board key switch group, 13 buffer, 15 CP
U, 17 Machine state detection sensors, 19 pulse oscillator, 21 bus, 23 RAM, 25 RO
M, 27 I / O & buffer, 29 driver, 3
1 Operation board display element, 33 Mechanical drive system, 35
Exposure, charging system, 37 feeding, paper ejection system, 39 fixing system, 41 peripheral device system,

Claims (9)

[Claims] 1. A power supply device for an image forming apparatus having an operation state in which image formation is performed, a standby state until transition to the operation state, and a power saving state in which power consumption is suppressed. A human body detecting means for detecting a human body located on the front surface, and a transition to a power saving state when the human body detecting means does not detect a human body in the standby state, and when the power saving state continues for a predetermined time, the image forming apparatus A power supply control means for cutting off power supply to the power supply device. 2. A power supply device for an image forming apparatus, which has an operation state in which image formation is performed, a standby state until transition to the operation state, and a power saving state in which power consumption is suppressed. A human body detection unit that detects a human body on the front surface, a light amount detection unit that detects the amount of light in the upper surface direction of the image forming apparatus, and if no human body is detected by the human body detection unit in the standby state, the power saving state is entered. And a power supply control unit that shuts off the power supply to the image forming apparatus when the light amount detected by the light amount detection unit falls below a predetermined value in the power saving state. Power supply. 3. In a power supply device of an image forming apparatus for forming an image, when a light amount detecting means for detecting a light amount in the upper surface direction of the image forming apparatus and a light amount detected by the light amount detecting means fall below a predetermined value. Power supply cutoff means for cutting off power supply to the image forming apparatus, and image formation when the light quantity detected by the light quantity detecting means exceeds a predetermined value when the image forming apparatus is in the power cutoff state. A power supply device comprising a power supply means for supplying power to the device. 4. In a power supply device of an image forming apparatus for forming an image, when a light amount detecting unit for detecting a light amount in the upper surface direction of the image forming apparatus and a light amount detected by the light amount detecting unit fall below a predetermined value. Power supply cutoff means for cutting off power supply to the image forming apparatus, and image formation when the light quantity detected by the light quantity detecting means exceeds a predetermined value when the image forming apparatus is in the power cutoff state. A power supply means for supplying power to the apparatus; and a power-off power supply means for supplying power to the light amount detection means and the power supply means when power supply is cut off by the power cut-off means. A power supply device characterized by the above. 5. In a power supply device of an image forming apparatus for forming an image, when the light amount detecting means for detecting the light amount in the upper surface direction of the image forming apparatus and the light amount detected by the light amount detecting means fall below a predetermined value. The light amount detected by the light amount detecting means exceeds a predetermined value when the image forming apparatus is provided with a power shutoff means for shutting off the power supply to the image forming apparatus and the image forming apparatus is in the power cutoff state. In such a case, power is supplied from the solar cell to the image forming apparatus, and power is supplied to the light amount detecting means and the power supply means when the power supply is cut off by the power cutoff means. A power supply unit for supplying power when the power is cut off. 6. A power supply device of an image forming apparatus having an operation state for performing image formation, a standby state until transition to the operation state, and a power saving state for suppressing power consumption, in a top surface direction of the image forming apparatus. Light amount detecting means for detecting the light amount of the image forming device, a power supply cutoff device for cutting off the power supply to the image forming apparatus when the light amount detected by the light amount detecting means falls below a predetermined value, and the image forming apparatus A power supply unit for supplying power to the image forming apparatus and for putting the image forming apparatus into a power saving state when the light amount detected by the light amount detecting unit exceeds a predetermined value in the cutoff state. A power supply device characterized by the above. 7. In a power supply device of an image forming apparatus for forming an image, a light amount detecting means for detecting the light amount in the upper surface direction of the image forming apparatus, and a threshold for detection by the light amount detecting means are arbitrarily set to arbitrary values. Changing means for changing, a power cutoff means for cutting off the power supply to the image forming apparatus when the light quantity detected by the light quantity detecting means falls below a predetermined value by the changing means, and the image forming apparatus A power supply unit for supplying power to the image forming apparatus when the light amount detected by the light amount detecting unit exceeds a predetermined value by the changing unit in the cutoff state. apparatus. 8. In a power supply device of an image forming apparatus for forming an image, a light amount detecting means for detecting a light amount in the upper surface direction of the image forming apparatus, and a threshold for detection by the light amount detecting means are set as a light amount for each predetermined period. Change means for appropriately changing the change ratio to any value based on the change ratio, and when the light amount detected by the light amount detecting means falls below a predetermined value by the changing means, the power supply to the image forming apparatus is shut off. And a power supply for supplying power to the image forming apparatus when the light amount detected by the light amount detecting means exceeds a predetermined value by the changing means when the image forming apparatus is in a power cutoff state. A power supply device comprising: a supply unit. 9. In a power supply device of an image forming apparatus for forming an image, a light quantity detecting means for detecting a light quantity in the upper surface direction of the image forming apparatus, and a threshold for detection by the light quantity detecting means are maintained for a predetermined period of time. Change means for appropriately changing to an arbitrary value based on the judgment criteria, and power shutoff for cutting off the power supply to the image forming apparatus when the light quantity detected by the light quantity detecting means falls below a predetermined value by the changing means. And a power supply means for supplying power to the image forming apparatus when the light amount detected by the light amount detecting means exceeds a predetermined value by the changing means when the image forming apparatus is in a power cutoff state. A power supply device comprising: