Patent ID: 7268928
Filing Date: 2007-09-11
Classification: B41J,G02B,H04N

Abstract:
1. An optical scanner, comprising: first and second reflecting optical elements, wherein the second reflecting optical element is disposed so as to reflect incident light to be incident on the first reflecting optical element and reflected light from the first reflecting optical element, wherein the second reflecting optical element reflects the incident light to be incident on the first reflecting optical element and the reflected light from the first reflecting optical element by using a common surface of the second reflecting optical element, and wherein the first reflecting optical element is formed of a curved surface mirror, and when a distance between the first reflecting optical element and the second reflecting optical element along a normal line at a vertex of the curved surface mirror is indicated as l, an angle formed by a center axis of incident light to be incident on the first reflecting optical element and a plane that includes the normal line at the vertex of the curved surface mirror and is parallel to a main scanning direction as θM, a width of the incident light on the first reflecting optical element in a sub-scanning direction as dm, a width of the incident light to be incident an the first reflecting optical element on the second reflecting optical element in the sub-scanning direction as di, and a width of reflected light from the first reflecting optical element on the second reflecting optical element in the sub-scanning direction as do, the following conditional expression (1) is satisfied: