Patent ID: 6632004
Filing Date: 2003-10-14
Classification: F21V,G03B

Abstract:
A lighting device comprising:an illuminating light source for illuminating an object; a first optical unit disposed on the side of said object of said illuminating light source and having: one of an optical action section for diverging light and an optical action section for converging light; and another section which is not formed in said optical action section; and a second optical unit disposed on the side of said object of said first optical unit and having an optical action section for exhibiting a characteristic opposite to a characteristic of said optical action section of said first optical unit, an area of the second optical unit being smaller than the sum of the areas of the second optical action section and said another section, wherein by moving said second optical unit from a position where it overlaps with said optical action section to a position where it overlaps with said another section, changing the light distribution characteristics.