Patent
1980-02-27
1982-03-30
Corbin, John K.
350 9626, 350273, G05D 2502
Patent
active
043221297
ABSTRACT:
An illuminating light control device for an endoscope for controlling both the intensity and hue of illuminating light over a wide range. A shutter mechanism is disposed between a discharge lamp light source and the receiving end of an optical fiber bundle. The shutter mechanism may be moved between at least three positions. At the first position, the light is allowed to pass directly from the light source to the optical fiber bundle and the light source is allowed to vary between its maximum and minimum limits. At the minimum limit, the shutter mechanism disposes a transmission light control means in the light path and the light source is returned to its maximum limit whereupon the output light to the optical fiber bundle is the same before the change as afterward. The light source can then be varied again between its maximum and minimum limits thereby effectively doubling the range of light output intensity. The shutter can also be moved to a position which blocks the optical path for a photographing operation.
REFERENCES:
patent: 2461379 (1949-02-01), Hamilton
patent: 2774276 (1956-12-01), Glasser et al.
patent: 3329074 (1967-07-01), Gosselin
patent: 3599630 (1971-08-01), Sato et al.
patent: 3698099 (1972-10-01), Matsura
patent: 4165919 (1979-08-01), Little
Harada Shinichi
Takahashi Nagashige
Yamamori Eiji
Corbin John K.
Kabushiki Kaisha Medos Kenkyusho
Koren Matthew W.
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