Patent ID: 8696165
Filing Date: 2014-04-15
Classification: F21V,G02B

Abstract:
1. A dynamic mask, adapted to an illumination system, the illumination system comprising at least one light source capable of emitting an illumination beam, the dynamic mask comprising: a board, adapted to be disposed in a transmission path of the illumination beam for adjusting a luminous flux of the illumination beam, wherein the board comprises at least one strip-shaped opening and the at least one strip-shaped opening comprises a first end and a corresponding second end, the at least one strip-shaped opening is minor-symmetric with respect to a symmetrical axis, the symmetrical axis is a straight line extending from the first end to the second end, a width of the at least one strip-shaped opening incrementally increases from the first end to the second end, and the board is capable of moving in a direction parallel with the symmetrical axis, wherein the strip-shaped opening comprises a first side and a corresponding second side, the first side connects to the first end and the second end, the second side connects to the first end and the second end, the first side and the second side are minor-symmetric with respect to the symmetrical axis, and a profile of the first side is expressed by an approximation of a polynomial curve, and wherein the polynomial curve is described as y=f(x), wherein f(x) is a polynomial function and an intersection between the first end and the symmetrical axis is defined as an original point, and a direction of extending from the original point to the second end along the symmetrical axis is defined as a +x direction, and a direction of extending from the original point, progressing along the first side, and perpendicular to the symmetrical axis is defined as a +y direction, wherein the half of the width of the at least one strip-shaped opening is less than the distance from the original point to the second end corresponding with the polynomial curve function.