| 摘要 |
PROBLEM TO BE SOLVED: To widen a light capture angle and improve the efficiency of light utilization using a simple configuration by a combination of an imaging element array and a lens, and to enable high-speed printing and/or energy saving by a reduction in light-emitting power and also enable downsizing.SOLUTION: An imaging element array 100 is such that a plurality of imaging elements are arrayed, an incident plane array 101 and an emission plane array 102 arranged in an array direction of the imaging elements are formed, and a prism reflection plane array 103 arranged in the array direction of the imaging elements is provided. A lens 50 forms an incident plane 51 on which a beam of light from a light source 10 is incident and an emission plane 52 from which the beam of light is emitted toward the incident plane array 101 of the imaging element array 100, and is shaped so that, for a most peripheral beam of light determined by an opening provided between the lens 50 and the imaging element array 100, a tangent line in contact with an emission point of the emission plane 52 of the lens 50 from which the most peripheral beam of light is emitted and the most peripheral beam of light emitted from the lens 50 intersect at a right angle. |
