Solid state sound lamp

DETAILED DESCRIPTION The present invention comprises a sound light source that overcomes the problems caused by the prior art incandescent light sources by combining leading edge LED technology with precision optics.
The present invention is a replacement light source for the incandescent light source which illuminates the color dye film so the analog or alternative information encoded onto the color dye layers can be read.
It combines long life, minimal heat dissipation and immunity from microphonic problems.
Typical color dye film is composed of three dye layers--a magenta dye layer, a cyan dye layer, and a yellow dye layer.
Release prints can be made utilizing any or all of these dye layers.
Any new projector sound light source must produce high intensity illumination in the visible range.
Specifically, LED light sources can emit high levels of narrow spectral energy with very little infrared energy.
Thus, if an LED process is selected that has a peak energy that coincides with the maximum density of a particular dye layer, an efficient, high quality system can be realized.
Tests have shown that the a 660 nm GaAlAs ultrabright red coincides perfectly with the cyan dye density curves.
(See curves in FIG.
1.
) The cyan color dye layer has the best resolution on color dye film.
In order to simulate the sound light source of a tungsten filament, it is necessary to assemble a custom array of approximately ten to twelve individual LED die arranged in a straight line.
The spacing between the LED die must be less than 15% of the size of the individual die in order to produce a band of light with minimal variation in intensity.
The array is powered by a current regulating device such as a current regulator integrated circuit or resistor.
Variations between LED die intensity is corrected through the use of compensation resistors.
In the present invention, in order to effectively match the array to existing projector optics, an immersion type lens is used in front of the LED die array.
The lens redirects the wide LED output pattern into a small cone of light in order to allow it to efficiently enter existing projector optics