Patent ID: 6414790
Filing Date: 2002-07-02
Classification: G02B

Abstract:
A window structure, comprisinga first panel of glass or non-birefringent plastic, carrying parallel strips of equal width of light polarizing molecules, the polarizing molecules oriented so that the polarization direction in each strip varies linearly from 90 degrees at one edge of the strip to âˆ’90 degrees at the other edge of the strip, the polarizing strips being separated from each other by clear strips, said clear strips each having a width equal to the width of the polarizing strips; a second panel of glass or non-birefringent plastic, carrying paralled strips of equal width of light polarizing molecules, the polarizing molecules oriented so that the polazization direction in each strip varies linearly from 90 degrees at one end of the strip to âˆ’90 degrees at the other edge of the strip, the polarizing strips being separated from each other by clear strips, said clear strips having a width equal to the width of the polarizing strips; the second panel is attached to the first panel so that the polarizing and clear strips of the second panel are parallel to the polarizing and clear strips of the first panel and aligned so that the polarizing strips of each panel line up with the clear strips of the other panel to serve as a first assembly, and all of the polarizing and clear strips of the first and second panels are located in the interior of the first assembly; a third panel of glass or non-birefringent plastic, carrying parallel strips of equal width of light polarizing molecules, the polarizing molecules oriented so that the polarization direction in each strip varies linearly from 90 degrees at one edge of the strip to âˆ’90 degrees at the other edge of the strip, the polarizing strips being separated from each other by clear strips, said clear strips each having a width equal to the width of the polarizing strips; a fourth panel of glass or non-birefringent plastic, carrying parallel strips of equal width of light polarizing molecules, the polarizing molecules oriented so that the polarization direction in each strip varies linearly from 90 degrees at one edge of the strip to âˆ’90 degrees at the other edge of the strip, the polarizing strips being separated from each other by clear strips, said clear strips each having a width equal to the width of the polarizing strips; the fourth panel is attached to the third panel so that the polarizing and clear strips of the fourth panel are parallel to the polarizing and clear strips of the third panel and aligned so that the polarizing strips of each panel line up with the clear strips of the other panel to serve as a second assembly, and all of the polarizing strips and clear strips of the third and fourth panels are located in the interior of the second assembly; a frame in which the first assembly is held in a fixed position and the second assembly is held so that a translational movement of the second assembly relative to the first assembly can be achieved, in a direction which causes the polarizing directions at each location in the second assembly to vary from parallel to perpendicular to the polarization directions of the adjacent locations in the first assembly as the translational movement is carried out.