OPTICAL ELEMENT AND APPARATUS FOR PRODUCING THE SAME

摘要

PROBLEM TO BE SOLVED: To accurately produce an optical element. SOLUTION: An optical element 1 has a recessed part 1a provided to one surface thereof and a flat diffraction plane 4 having a diffraction lattice 3 is formed to the almost central part of the recessed part 1a and first and second bent surfaces 5a, 5b respectively inclined so as to become recessed parts are provided on both sides of the diffraction plane 4. In a mold for producing the optical element 1, a material is poured from a gate part 25 provided at a position not interfered with the mold member forming the first bent surface 5a or the second bent surface 5b to form the optical element 1.