HUGH J DIAMOND
Engineers in Kennett Sq, PA

4774643, Sep 27, 1988

Nov 17, 1986

6/931376

M. Douglas McGinnis - Glenolden PA
Hugh J. Diamond - Kennett Square PA

Diagin, Inc. - Kennett Square PA

F21L 700

362189

The disclosed device provides illumination for a radiation dosimeter or other tubular instrument which is held directly in front of the eye for viewing. It can also be used as a compact flashlight for inconspicuous use such as for reading a map in a car or a program in a theater, and it can be carried by medical personnel to illuminate the eye of a patient. The illuminator comprises a light-emitting diode (LED) protruding through an annular spacer. The leads from the LED are bent around a battery comprising one or more button cells. The inner assembly comprising the LED, spacer and battery is held together by a plastic sleeve of shrink-wrap material, such as polyolefin. The inner assembly is enclosed in a thimble-shaped flexible plastic casing, which is adapted to slide onto the end of a dosimeter for permanent mounting. When the user squeezes the casing, the leads are brought into contact with the batteries, thereby completing the circuit, lighting the LED, and illuminating the dosimeter. The illuminator is fabricated by assembling the parts within a heat-shrinkable plastic sleeve, heating the sleeve to shrink it around the parts to secure them together, and then inserting the shrink-wrapped assembly within the casing.