Neutral density filter with linearly tapered transmissivity

• Main Authors: WEN DONGYING, YIN XIAOJUN, YANG WENHUA, FEI SHUGUO, JIN XIU, ZHANG YONGXI
• Format: Patent
• Language: Chinese; English
• Published: 07.03.2012
• Subjects: OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS

The invention, which belongs to the energy light splitting element field, especially relates to a neutral density filter with linearly tapered transmissivity. The neutral density filter includes a substrate body (1); a thin film layer (2) is plated on the substrate body (1); an installation hole (3) is arranged at a central portion of the substrate body (1); a first clear area (4) is arranged at the peripheral region of the installation hole (3); a second clear area (5) is arranged at the peripheral region of the substrate body (1), wherein an annular graduated scale is fixedly arranged at the second clear area (5); and a third clear area (6) is arranged in the substrate body (1). Besides, the thickness of the thin film layer (2) is in an index change mode with positions of the film layer and the thickness satisfies the following relationship: d= A ( 1-10 ( B* alpha) ), wherein the d expresses a film layer thickness, the A and the B express undetermined parameters and the alpha expresses a position of the fil