Image forming apparatus

摘要

An image forming apparatus having an active mode of performing image formation and an electric power saving mode of reducing electric power consumption, the apparatus including: an electric power measuring portion configured to measure the electric power consumption of the apparatus; a storage portion configured to store electric power consumption information per unit time of the apparatus in the electric power saving mode; and a control portion configured to determine, based on the electric power consumption measured by the electric power measuring portion, consumed electric energy of the apparatus during a period in which the apparatus is in the active mode, and determine, based on a length of period in which the apparatus is in the electric power saving mode and the electric power consumption information stored in the storage portion, consumed electric energy of the apparatus during the period in which the apparatus is in the electric power saving mode.

主权项

1. An image forming apparatus having an active mode of performing image formation and an electric power saving mode of reducing electric power consumption, the image forming apparatus comprising:
an electric power measuring portion configured to measure the electric power consumption of the image forming apparatus; a storage portion configured to store electric power consumption information per unit time of the image forming apparatus in the electric power saving mode; a control portion configured to determine, based on the electric power consumption measured by the electric power measuring portion, consumed electric energy of the image forming apparatus during a period in which the image forming apparatus is in the active mode, and determine, based on a length of period in which the image forming apparatus is in the electric power saving mode and the electric power consumption information stored in the storage portion, consumed electric energy of the image forming apparatus during the period in which the image forming apparatus is in the electric power saving mode; a first electric supply line configured to supply electric power to the image forming apparatus via the electric power measuring portion; a second electric supply line configured to supply electric power to the image forming apparatus; a second electric power measuring portion configured to measure electric power consumption of the electric power of the image forming apparatus that is supplied via the second electric supply line and output a measured value; and a second control portion configured to sample the measured value of the second electric power measuring portion and output a result of sampling, wherein the storage portion stores a result of sampling of the control portion and the result of sampling of the second control portion, wherein the second control portion in the active mode samples the measured value of the second electric power measuring portion in a predetermined cycle, and determines consumed electric energy of the active mode based on a result of sampling, wherein the second control portion in the electric power saving mode performs one of: sampling the measured value of the second electric power measuring portion in the predetermined cycle, and determining consumed electric energy of the electric power saving mode based on a result of sampling; determining the consumed electric energy of the electric power saving mode based on the electric power consumption information stored in the storage portion without sampling the measured value of the second electric power measuring portion; and sampling the measured value of the second electric power measuring portion a predetermined number of times, which is smaller than a number of sampling times in the active mode, after a predetermined period of time has elapsed since the start of the electric power saving mode, storing a result of sampling in the storage portion, and thereafter generating the consumed electric energy of the electric power saving mode based on the result of sampling stored in the storage portion without sampling the measured value until the electric power saving mode is ended, and wherein the control portion determines the consumed electric energy of the image forming apparatus based on the consumed electric energy of the control portion and the consumed electric energy of the second control portion.