Patent ID: 6836633
Filing Date: 2004-12-28
Classification: G03G,H04N

Abstract:
An optical scanning device, comprising:a housing; a first moving carnage carrying a light source provided to irradiate an image surface of an original document with light and a first mirror provided to reflect the light reflected from the image surface of the original document; a second moving carriage carrying at least one of a second mirror and a third mirror each provided to reflect the light reflected from the first mirror, the second moving carriage being configured to move in a sub-scanning direction at about one-half of a moving speed of the first moving carriage; a plurality of timing pulleys spaced apart in the sub-scanning direction and including at least a first timing pulley and a second timing pulley; a timing belt spanned around the first and second timing pulleys to reciprocate the first moving carriage in the sub-scanning direction; a drive device configured to drive the first timing pulley to rotate; a plurality of flat pulleys rotatably supported by the second moving carriage and spaced apart in the sub-scanning direction by a distance corresponding to a moving amount of the second moving carriage; a flat belt spanned around the plurality of flat pulleys to reciprocate the second moving carriage in the sub-scanning direction; an engaging member detachably engaging the timing belt and the flat belt to the first moving carriage; and a fixing member fixing the flat belt to the housing at a position different from a position where the flat belt is engaged to the first moving carriage by substantially half of a circumference of the flat belt; wherein the plurality of timing pulleys, timing belt, plurality of flat pulleys, flat belt, engaging member, and fixing member are provided at each side of the first and second moving carriages in the main scanning direction.