1982-03-19
1985-04-16
Corbin, John K.
350 961, G02B 2308
Patent
active
045112223
ABSTRACT:
An annular inspection lens is described for viewing obscured internal cylindrical surfaces. This annular lens provides a projected image of the internal cylindrical surface in all directions simultaneously and uses ambient light for illumination.
REFERENCES:
patent: 3073210 (1963-01-01), Packard
patent: 3283653 (1966-11-01), Tokarzewski
patent: 3413067 (1968-11-01), Froio
Corbin John K.
Gass Rebecca D.
The Charles Stark Draper Laboratory Inc.
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