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In general, a plurality of lenses in MLA are regularly arranged, and this arrangement causes light interference. Since the light amount unevenness occurred due to the interference, the unevenness could be reduced by arranging the lenses at random in three axes. The light amount unevenness was also caused by transfer errors that occurred in the molding process. The shape error of lens was controlled to nanometer-size by developing a correction process that functioned the shape error and adapted it to mold processing. Although a high refractive resin was used to widen the projection angle, it was difficult to manufacture a thin lens by injection molding because of the high viscosity. This problem was also solved by developing a heating and cooling method in the molding process. As a result, by optimizing the lens arrangement and controlling the error of the lens shape, the light amount unevenness of projection could be suppressed to 10% or less. |
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CITATIONS
Cited by 2 patents.
Diffraction
Optics manufacturing
Light
Time of flight cameras
Diamond
Optical components
Optical design
