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Abstract

A method and apparatus to correct power source voltage variation in an image forming system. The apparatus to correct power source voltage variation includes: an image density sensing unit which senses an image density; a first variation correction unit which calculates a variation between a first power source voltage of the image density sensing unit and a first reference value, and performs correction by applying a correction amount, based on the calculated variation, to an image density sensed in the image density sensing unit; an environment detection value measuring unit which measures a roll resistance value for environment recognition; and a second variation correction unit which calculates a variation between a second power source voltage of the environment detection value measuring unit and a second reference value, and performs correction by applying a correction amount, based on the calculated variation, to a roll resistance value measured in the environment detection value measuring unit. Accordingly, when a predetermined analog value is measured to control an image density or a high voltage output, the power source voltage variation due to change in a power line or system variation is corrected such that an image density can be controlled more precisely.

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First Claim