Color and intensity measuring module for test of light emitting components by automated test equipment
AssigneeDelaware Capital Formation, Inc.
InventorDavid P. Rogers
Life of this patent
Estimating the term…
Abstract
A test module used to verify the correct placement of light-emitting devices on electronic assemblies, by performing color and luminous intensity tests on these devices. The module includes one or a number of color sensitive photodiodes, which when exposed to light coupled from the emitter under test, will accurately measure the intensity, as well as the true color emitted by the device. The test module outputs analog signals, one directly proportional to the intensity, a second voltage proportional to the spectral wavelength of the device under test.
Claims17
A test module for optically measuring color and intensity of light emitted from light-emitting devices comprising:
- a plurality of sensors, each sensor having three photodetectors individually filtered to pass red, green, and blue portions of visible light, and each sensor producing a sensor signal;
- and
- electronics for receiving and conditioning each sensor signal to produce wavelength and intensity output signals.
A color and intensity test module for automated test equipment comprising:
- a sensor assembly capable of detecting color content of light emitted from a unit under test;
- means for processing the color content to calculate intensity and wavelength data of the light emitted from the unit under test;
- and
- an output interface to present the intensity and wavelength data to the automated test equipment in digital or analog form;
- wherein the means for processing uses a predefined set of color ratios based on standard color matching tables to determine wavelength by comparing the color ratios of the light emitted by the unit under test.
A method to test color and intensity of a light-emitting device comprising the steps of
- detecting light from the light-emitting device by a three-color sensor;
- filtering the light into levels of red, green, and blue;
- conditioning the red, green, and blue levels;
- converting the levels into digital values;
- generating an analog wavelength value linearly scaled to the visible spectrum;
- generating an intensity value linearly representing luminous intensity;
- and
- reading the wavelength value and the intensity value and comparing the values against expected values.
Dependencies are inferred from the claim text.