Optical element
AssigneeCanon Kabushiki Kaisha
InventorsMakoto Sekita, Fumiaki Kumagai
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Abstract
This invention has as its object to prevent deterioration of optical performance by suppressing the respective reflection surfaces from being decentered relative to each other in an optical element formed by placing a plurality of reflection surfaces having curvatures at neighboring positions. In order to achieve this object, an optical element according to this invention has a first reflection surface block formed by placing a plurality of reflection surfaces having curvatures at neighboring positions, and a second reflection surface block which faces the first reflection surface block, and is formed by placing one or more reflection surfaces at neighboring positions, and the first and second reflection surface blocks are formed by a metal mold.
Claims13
A method for forming an optical element by using a metal mold which compensates for relative positions of plural reflection surfaces, said method comprising the steps of:
- forming on a transparent member a first reflection surface group, comprising a plurality of reflection surfaces each having different curvature and arrayed in a predetermined direction, and a second reflection surface group, which opposes said first reflection surface group and comprises a plurality of optical surfaces including at least one reflection surface, each having different curvature and arrayed in the predetermined direction,
- wherein said plurality of reflection surfaces of said first reflection surface group and said at least one reflection surface of said second reflection surface group are integrally molded by a metal mold having shapes each corresponding to each shape of said reflection surfaces.
Dependencies are inferred from the claim text.