Illumination – Illuminated scale or dial
Patent
1988-03-17
1989-12-12
Lazarus, Ira S.
Illumination
Illuminated scale or dial
362 27, 362 62, 362373, G01D 1128
Patent
active
048871893
ABSTRACT:
A panel mounted aircraft cockpit instrument is provided with a specially designed illuminating section which is used to light the instrument without causing interference with the operation of night vision equipment in the cockpit. An infrared light-filtering illuminating section is removably secured within a front-accessible recessed portion of the instrument and includes a sealed, filtered housing in which one or more incandescent bulbs are disposed. Each bulb is resiliently supported within its housing using a resilient, electrically resistive yet relatively highly heat conductive supporting material. Heat generated by the bulb is conducted outwardly through its supporting material into a metal heat sink portion of the housing and then externally dissipated therefrom. The illuminating structure may be easily and quickly removed and replaced without the necessity of removing the instrument or gaining access to the rear of the panel. Additionally, the resilient support of each bulb helps to insulate it from mechanical shock and vibration, and the conductive heat sinking of the bulb significantly increases its operating life.
REFERENCES:
patent: 2602036 (1952-07-01), Sullivan
patent: 2695354 (1954-11-01), Neugass
patent: 2827557 (1958-03-01), Neugan
patent: 2874268 (1959-02-01), Martin
patent: 2905807 (1959-09-01), Stevens
patent: 2963571 (1960-12-01), Roggan
patent: 3450870 (1969-06-01), Curl
patent: 3526762 (1970-09-01), Blackwell
patent: 3629568 (1971-12-01), Hanes
patent: 3757270 (1973-09-01), Dupree
Executive Technical Services, Inc.
Hagarman Sue
Lazarus Ira S.
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