Patent ID: 7791631
Filing Date: 2010-09-07
Classification: B41J

Abstract:
1. A line head, comprising: an element substrate that includes luminous element groups as groups of a plurality of luminous elements; and a lens array that includes two-dimensionally arranged lenses which have an optical property of inverting or non-unity-magnification, focus light from the luminous element groups to form spot groups on a cylindrically-shaped image plane, and are provided corresponding to the respective luminous element groups, wherein the plurality of luminous elements are two-dimensionally arranged in point symmetry in each luminous element group, a plurality of spots are formed as the spot group when the respective luminous elements of the luminous element group emit light, and an inter-point distance between an intersection of a line extending from a symmetry center of the luminous element group in an optical axis direction of the lens with the image plane and a center of gravity position of the spot group is shorter than a specified distance.