LED array head and minute reflection optical elements array for use in the LED array head

摘要

The present invention relates to a LED array head which includes a base plate, and an array of protruding LED light-emitting portions formed on the base plate. Further, a mirror array including reflection mirror structures is formed on an upper circumferential surface of corresponding LED light-emitting portions, thereby narrowing a radiation angle of light emitted by the corresponding light-emitting portions. In addition, the reflection mirror structures have a circular cone frustum shape with a diameter at an upper emission side larger than a diameter at a lower emission side. The present invention also relates to a minute reflection optical elements array of an optical writing apparatus having an array of light-emitting elements formed on a base plate of an LED array head. The optical elements array includes opening portions having a tapering cross-section shape which becomes narrower in a direction toward the base plate at sides opposing corresponding light-emitting elements. In addition, the corresponding opening portions are disposed over the corresponding light emitting elements. The minute reflection optical elements array also includes marginal escape recess portions formed at a surface of the optical elements array to be joined with a surface of the base plate of the array of light-emitting elements. The marginal escape recess portions have a shape corresponding to a shape of a wiring portion on the surface of the array of light-emitting elements at sides of the corresponding light-emitting elements. The present invention further described a method of making the devices described above.