Brevetti

Digitando “arcobaleno artificiale” su Google patent il primo brevetto risulta risalire al 1980:

• Nel 1978 Gebhard Kuhn e Ludwig Meier esposero il loro esperimento per la creazione di un arcobaleno artificiale utilizzando luce e prisma. Divenne brevetto nel 1980:

Abstract

The invention is in concern of an arrangement for producing artificial rainbows, particularly for use in planetaria, in which a bundle of light emitted from a light source and directed through an aperture upon a prism is dispersed by the latter and reflected at a cylindrical reflector. Due to the reflection at the cylindrical reflector the projected light bundle is of a rainbow shape, the radius thereof depends on the position of the cylindrical reflector relative to the prism.

         US4214297A

• Nel 1989 Kei More espose la sua idea che riguardava la creazione di un arcobaleno artificiale con un prisma, brevettata ufficialmente nel 1990:

Abstract

A rainbow forming device includes a light guide for transmitting visible light therethrough and a prism having a cross-section of a substantially equilateral triangle for splitting the light into a series of colors of the spectrum to form a rainbow. A light-emitting end of the light guide is set with its axis perpendicular to the prism's first edge. The visible light emitted from the light guide's end passes through the prism along the path from prism's first vertex including the prism's first edge to said prism's second vertex and the light split into colors of the spectrum are emitted from the prism's third vertex and forms a rainbow.

          US4955975A