Annular illumination device

Details Annular illumination device Annular illumination device

1982-08-10

1984-10-09

Nelson, Peter A.

Illumination

Revolving

362259, 362287, 362308, 362311, 362331, 362335, 350 9618, 350 9624, F21V 704

Patent

active

044765193

ABSTRACT:
An annular illumination device comprising a tubular light transmitter, a light source means able to project parallel light rays onto an entrance end face of the tubular light transmitter from a direction intersecting diagonally with the entrance end face and a light collecting lens collecting conical light bundle coming out of an exit end face of the tubular light transmitter to form an image of an annular light in order to make it possible to make a bright efficient annular illumination. The angle formed by the parallel light rays with the entrance end face of the tubular light transmitter can be varied in order to vary the diameter of the image of the annular light.

REFERENCES:
patent: 3600594 (1971-08-01), Moore
patent: 3663822 (1972-05-01), Uchida
patent: 3669524 (1972-06-01), Shio
patent: 3922618 (1975-11-01), Tavin
patent: 4042823 (1977-08-01), Decker et al.
patent: 4054364 (1977-10-01), Webster
patent: 4072416 (1978-02-01), Waly
patent: 4361863 (1982-11-01), Hagner
Kahl, Fiber Optics in Electronics, Electronics World, May 1965, pp. 25-28.

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