Transparent-scattering type optical device including a prism wit

Details Transparent-scattering type optical device including a prism wit Transparent-scattering type optical device including a prism wit

1991-07-12

1993-04-27

Sikes, William L.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 49, 359831, 359833, G02F 11335, G02F 504

Patent

active

052067467

ABSTRACT:
A transparent-scattering type optical device which includes a transparent-scattering type optical element having a layer of transparent-scattering mode optical material whose light scattering characteristics are changed in response to an external input; at least one prism having a bottom surface which is attached to an end portion of the transparent-scattering type optical element, and where the prism has a longitudinal cross section of a shape which is either triangular or triangular with a top portion cut away. A pair of angles formed by two opposite sides of the prism and the bottom surface are between 65.degree. and 90.degree. inclusive where one of the two angles is not equal to 90.degree.. A light absorbing face is formed from an area of the prism surface defined by portions of the two opposite sides of the prism nearest to the top.

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patent: 4838660 (1989-06-01), Fergason
patent: 5018835 (1991-05-01), Dorschner
patent: 5042925 (1991-08-01), Broer et al.
patent: 5061050 (1991-10-01), Ogura

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