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Reduced debris contamination of photodiode - phototransistor operation, reduced ambient light on the phototransistor, precision apertures, and universal mounting are characteristics of this device.
English (United States)
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Multichannel Optical Device with Protective Enclosure
Reduced debris contamination of photodiode - phototransistor operation,
reduced ambient light on the phototransistor, precision apertures, and universal
mounting are characteristics of this device.
Referring to the figure, the device is a three-channel optical sensor, but it can
be applied to any number of channels. The sensor comprises four main parts.
Housing 1 is made of molded polysulfone, and is used to hold registration of the
aperture plates 2 and 5 and circuit boards 7 and 8. The portion 1a of the housing
that the light-emitting diodes (LEDs) 4 shine through is made .010" to .015" thick
to reduce optical losses. This thin portion will pass infrared light with little
attenuation, and provides a protective covering for the aperture just behind it.
This greatly reduces the problem of debris clogging the passageway between
LED 4 and detector 6, especially when very narrow slit apertures are used. The
remaining portions of the housing 1 are made thicker to reduce ambient light
from reaching the phototransistors; thus, the need for a light-sealed environment
is not required.
A representative application for this device is as a precision emitter for a
matrix printer. Here aperture widths of .010" on the detector 6 and LED 4 are
required for positional accuracy. Other applications may use larger apertures, or
none at all. The design of this device makes it easy to produce different
assemblies of one to three c...