Information processing apparatus, method for controlling power state shift and clearing or not clearing a shift time measured

Abstract

An information processing apparatus operating in a first power state, a second power state, a third power state, and fourth power state includes a power control unit configured to the third power state to the fourth power state when a first shift time is measured, and a control unit configured to, when the power control unit has shifted the power state of the information processing apparatus from the third power state to the first power state, clear the measured time and not to, when the power control unit has shifted the power state of the information processing apparatus from the third power state to the second power state, clear the measured time clear.

What is claimed is: 
     
       1. An information processing apparatus operating in a first power state, a second power state with power consumption lower than that of the first power state, a third power state with power consumption lower than that of the second power state, and a fourth power state with power consumption lower than that of the third power state, the information processing apparatus comprising:
 a printer configured to form an image on a sheet; 
 a time measurement unit timer configured to measure time; 
 a power control unit controller configured to shift a power state of the information processing apparatus which is in the third power state 
 
       (1) from the third power state to the fourth power state when in a case where a first shift time is measured by the time measurement unit timer, 
       (2) from the third power state to the second power state when in a case where a first shift factor for shifting the information processing apparatus from the third power state to the second power state occurs before the first shift time is measured by the time measurement unit timer, and 
       (3) from the third power state to the first power state when in a case where a second shift factor for shifting the information processing apparatus from the third power state to the first power state occurs before the first shift time is measured by the time measurement unit timer; and
 a control unit controller configured to, when in a case where the power control unit controller has shifted the power state of the information processing apparatus from the third power state to the first power state, clear the time measured by the time measurement unit timer, and not to, when in a case where the power control unit controller has shifted the power state of the information processing apparatus from the third power state to the second power state in accordance with an occurrence of the first shift factor, clear the time measured by the time measurement unit timer, 
 wherein the fourth power state is a turned off state. 
 
     
     
       2. The information processing apparatus according to  claim 1 , further comprising a network interface unit configured to be able to respond to a packet transmitted from an external apparatus via a network,
 wherein the first shift factor is to receive a packet to which the network interface unit is not able to respond. 
 
     
     
       3. The information processing apparatus according to  claim 2 , wherein the packet to which the network interface unit is not able to respond includes a packet for inquiring device information about the information processing apparatus. 
     
     
       4. The information processing apparatus according to  claim 1 , further comprising an image forming unit configured to form an image on a sheet,
 wherein the second shift factor is to receive a packet that cause which causes the image forming unit printer to form an image on a sheet. 
 
     
     
       5. The information processing apparatus according to  claim 1 , wherein the time measurement unit timer starts to measure the time when the power state of the image processing apparatus is shifted to the second power state or the third power state. 
     
     
       6. A method for controlling an information processing apparatus operating in a first power state, a second power state with power consumption lower than that of the first power state, a third power state with power consumption lower than that of the second power state, and a fourth power state with power consumption lower than that of the third power state, the method comprising:
 measuring, by a timer configured to measure time, time when a power state of the image processing apparatus is shifted to the second power state or the third power state,; 
 shifting the power state of the information processing apparatus from the third power state to the fourth power state when in a case where a first shift time is measured by a time measurement unit configured to measure time the timer; and 
 clearing the time measured by the time measurement unit when timer in a case where the power state of the information processing apparatus is shifted from the third power state to the first power state, wherein the time measured by the time measurement unit timer is not cleared when in a case where the power state of the information processing apparatus is shifted from the third power state to the second power state in accordance with an occurrence of the first shift factor, 
 wherein the information processing apparatus comprises a printer configured to form an image on a sheet and a controller configured to control at least the printer, 
 
       and wherein the fourth power state is a turned off state.   
     
     
       7. A non-transitory storage medium storing a program for causing a computer to perform a method for controlling an information processing apparatus operating in a first power state, a second power state with power consumption lower than that of the first power state, a third power state with power consumption lower than that of the second power state, and a fourth power state with power consumption lower than that of the third power state, the method comprising:
 measuring, by a timer configured to measure time, time when a power state of the image processing apparatus is shifted to the second power state or the third power state; 
 shifting the power state of the information processing apparatus from the third power state to the fourth power state when in a case where a first shift time is measured by a time measurement unit configured to measure time the timer; and 
 clearing the time measured by the time measurement unit when timer in a case where the power state of the information processing apparatus is shifted from the third power state to the first power state, wherein the time measured by the time measurement unit timer is not cleared when in a case where the power state of the information processing apparatus is shifted from the third power state to the second power state in accordance with an occurrence of the first shift factor, 
 wherein the information processing apparatus comprises a printer configured to form an image on a sheet and a controller configured to control at least the printer, 
 
       and wherein the fourth power state is a turned off state.   
     
     
       8. The information processing apparatus according to claim 1,
 wherein in a case where the information processing apparatus is in the second power state, power supply for the printer is restricted, and   wherein in a case where the information processing apparatus is in the third power state, power supply for the printer and the controller are restricted.   
     
     
       9. The information processing apparatus according to claim 8,
 wherein in a case where the information processing apparatus is in the second power state, power supply for the controller is not restricted.   
     
     
       10. The information processing apparatus according to claim 9, wherein in a case where the information processing apparatus is in the third power state, power supply for a CPU of the controller is stopped. 
     
     
       11. The information processing apparatus according to claim 8, wherein in a case where the information processing apparatus is in the third power state, power supply for a CPU of the controller is stopped. 
     
     
       12. The method according to claim 6,
 wherein in a case where the information processing apparatus is in the second power state, power supply for the printer is restricted, and   wherein in a case where the information processing apparatus is in the third power state, power supply for the printer and the controller are restricted.   
     
     
       13. The method according to claim 12,
 wherein in a case where the information processing apparatus is in the second power state, power supply for the controller is not restricted.   
     
     
       14. The non-transitory storage medium according to claim 7,
 wherein in a case where the information processing apparatus is in the second power state, power supply for the printer is restricted, and   wherein in a case where the information processing apparatus is in the third power state, power supply for the printer and the controller are restricted.   
     
     
       15. The non-transitory storage medium according to claim 14,
 wherein in a case where the information processing apparatus is in the second power state, power supply for the controller is not restricted.   
     
     
       16. An information processing apparatus that is able to operate in a first power state, a second power state with power consumption lower than that of the first power state, a third power state with power consumption lower than that of the second power state, and a fourth power state with power consumption lower than that of the third power state, the information processing apparatus comprising:
 a printer configured to form an image on a sheet;   a timer configured to measure time;   a power controller configured to shift a power state of the information processing apparatus which is in the third power state   
       (1) from the third power state to the fourth power state in a case where a first shift time is measured by the timer, 
       (2) from the third power state to the second power state in a case where a first shift factor for shifting the information processing apparatus from the third power state to the second power state occurs before the first shift time is measured by the timer, and 
       (3) from the third power state to the first power state in a case where a second shift factor for shifting the information processing apparatus from the third power state to the first power state occurs before the first shift time is measured by the timer; and
 a controller configured to, in a case where the power controller has shifted the power state of the information processing apparatus from the third power state to the first power state, clear the time measured by the timer, and not to, in a case where the power controller has shifted the power state of the information processing apparatus from the third power state to the second power state, clear the time measured by the timer, 
 wherein the fourth power state is a turned off state, and 
 wherein the information processing apparatus in the third power state receives a predetermined packet from an external device and then sends a response for the received predetermined packet to the external device with the information processing apparatus remaining in the third power state. 
 
     
     
       17. The information processing apparatus according to claim 16, further comprising a network interface configured to be able to respond to a packet transmitted from an external apparatus via a network,
 wherein the first shift factor is to receive a packet to which the network interface is not able to respond.   
     
     
       18. The information processing apparatus according to claim 17, wherein the packet to which the network interface is not able to respond includes a packet for inquiring device information about the information processing apparatus. 
     
     
       19. The information processing apparatus according to claim 16,
 wherein the second shift factor is to receive a packet which causes the printer to form an image on a sheet.   
     
     
       20. The information processing apparatus according to claim 16, wherein the timer starts to measure the time when the power state of the image processing apparatus is shifted to the second power state or the third power state. 
     
     
       21. The information processing apparatus according to claim 16,
 wherein in a case where the information processing apparatus is in the second power state, power supply for the printer is restricted, and   wherein in a case where the information processing apparatus is in the third power state, power supply for the printer and power supply for the controller are restricted.   
     
     
       22. The information processing apparatus according to claim 16,
 wherein in a case where the information processing apparatus is in the second power state, power supply for the controller is not restricted.   
     
     
       23. A method for controlling an information processing apparatus that is able to operate in a first power state, a second power state with power consumption lower than that of the first power state, a third power state with power consumption lower than that of the second power state, and a fourth power state with power consumption lower than that of the third power state, the method comprising:
 measuring, by a timer configured to measure time, time when a power state of the image processing apparatus is shifted to the second power state or the third power state;   shifting the power state of the information processing apparatus from the third power state to the fourth power state in a case where a first shift time is measured by the timer; and   clearing the time measured by the timer in a case where the power state of the information processing apparatus is shifted from the third power state to the first power state, wherein the time measured by the timer is not cleared in a case where the power state of the information processing apparatus is shifted from the third power state to the second power state in accordance with an occurrence of the first shift factor,   receiving a predetermined packet from an external device in the third power state, and then,   sending a response for the received predetermined packet to the external device with the information processing apparatus remaining in the third power state,   wherein the information processing apparatus comprises a printer configured to form an image on a sheet and a controller configured to control at least the printer, and   wherein the fourth power state is a turned off state.