Abstract: A method and apparatus measures electrical power usage and quality, while mitigating the effects of noise on measured signals or parameters. Specifically, a digital electrical power and energy meter employs a method in which a processor averages a parameter, such as voltage or current, over a plurality of cycles of a time-varying signal, such as an AC electrical signal. The method employed by the meter samples a parameter over the plurality of cycles and computes the average of the samples corresponding to the same phase angle of the signal to produce an average signal.

Abstract: An optical scanner for an image forming apparatus has a housing having a wall surface provided with a through-hole, and an optical scanning unit, which is provided within the housing, scans light on an object to be scanned in order to form an image on the object to be scanned, and includes: a polygon motor; a polygon mirror that reflects the light while being rotated by a driving force of the polygon motor; a mirror member that reflects the light reflected by the polygon mirror, toward a target object; and a mirror holding member that is attached to the wall surface of the housing and holds the mirror member. The mirror holding member has a heat radiation part that is exposed to the outside of the housing through the through-hole.

Abstract: An image forming apparatus includes: a main body; a toner container detachably mounted to the main body; a wireless tag provided on the toner container; and a communicator provided in the main body and being capable of performing a wireless communication with the wireless tag, wherein the communicator includes: a communication strength detector for detecting a communication strength of the wireless communication performed with the wireless tag; and a communication output adjuster for changing the communication output of the communicator so that the communication strength detector detects a predetermined communication strength, when a communication strength detected by the communication strength detector is not the predetermined communication strength.