Patent ID: 8760738
Filing Date: 2014-06-24
Classification: H04N

Abstract:
1. A measuring method for measuring a deviation in timing of start of writing in a plurality of scanning lines using an optical scanning device that writes image information on a surface to be scanned by scanning the surface with a plurality of light beams along a plurality of scanning lines, the light beams being output from a plurality of light-emitting elements including a first light-emitting element and a second light-emitting element which are arranged so as to be displaced from each other in a direction corresponding to a direction of the scanning lines, the measuring method comprising: detecting timing at which light from the first light-emitting element is received by a light receiving element, as a first time, the light receiving element outputting a synchronization detecting signal before start of writing; detecting timing at which light from the second light-emitting element is received by the light receiving element, as a second time; and obtaining a deviation in timing of start of writing for the second light-emitting element with respect to the first light-emitting element based on a difference between the second time and the first time.