Apparatus light pen and its use

摘要

A light pen for writing on a polarized light sensitive surface is disclosed. Light emitting diodes emit non-polarized light and a polarization block comprising of a truncated cone shaped collimating optical element, a broad band polarization divider, a broadband semi-wave plate, shifting bi-prism and light beam coupler are built to convert the non-polarized light to be converted to polarized uniform intensity light that is focused using a set of projection lens to a writing surface. The said light pen can be used for creating non erasable writing on many types of articles, documents, and records that would provide verification of authenticity and security.

主权项

1. An apparatus, comprising;
a toggle for selecting a specific light emitting diode to produce a light beam, wherein the specific light emitting diode is at least one of a red, green and blue; a polarization block consisting of a truncated cone shaped collimating optical element, a broad band polarization divider, a broadband semi-wave plate and a light beam coupler; a set of projection lens, wherein the set of projection lens is made of at least one of a two, three, four, five and six lenses; and a power supply block for the apparatus.