Device for controlling an amount of light of a lighting unit for

Details Device for controlling an amount of light of a lighting unit for Device for controlling an amount of light of a lighting unit for

1997-08-25

1999-11-16

Leubecker, John P.

Surgery

Endoscope

Having imaging and illumination means

600178, A61B 1045

Patent

active

059848626

ABSTRACT:
A device for controlling an amount of light of a lighting unit for use in an endoscope, used to view an image of an object. The device includes a light shield for shielding light generated by a light source and transmitted to the endoscope. A stepping motor drives the light shield for a series of predetermined time intervals. Brightness of the image is detected during each of the time intervals and pulses are generated during each of the time intervals. The number of pulses generated is determined in accordance with a difference between the brightness of the image detected during each of the time intervals and a desired brightness of the image. The pulses generated are used to drive the stepping motor in each of the plurality of time intervals.

REFERENCES:
patent: 4926247 (1990-05-01), Nagasaki et al.
patent: 5184159 (1993-02-01), Furuya et al.
patent: 5184170 (1993-02-01), Takahashi et al.
patent: 5220912 (1993-06-01), Nakasima et al.
patent: 5237403 (1993-08-01), Sugimoto et al.
patent: 5277172 (1994-01-01), Sugimoto
patent: 5331949 (1994-07-01), Funakoshi et al.

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