Patent ID: 7714883
Filing Date: 2010-05-11
Classification: G06K

Abstract:
1. A control method for controlling an optical head having a plurality of light emitting devices, comprising: dividing the plurality of light emitting devices into a plurality of blocks by grouping adjacent light emitting devices of the plurality of light emitting devices; adjusting levels of driving signals supplied to the adjacent light emitting devices for each of the plurality of blocks so that emission luminances of the adjacent light emitting devices belonging to the each of the plurality of blocks become substantially equal to each other; and adjusting emission periods so that the equalized emission luminances of the plurality of blocks become substantially equal to each other, wherein a number of the plurality of light emitting devices belonging to each of the plurality of blocks in a center of the optical head is larger than a number of the plurality of light emitting devices belonging to each of the plurality of blocks at an end of the optical head, and the plurality of light emitting devices are individually controlled.