Automatic focus position adjusting unit for use in shadowless li

Details Automatic focus position adjusting unit for use in shadowless li Automatic focus position adjusting unit for use in shadowless li

1990-12-21

1991-11-26

Husar, Stephen F.

Illumination

Work-table lighting system

315152, 362286, 362804, A61G 1300

Patent

active

050687670

ABSTRACT:
An automatic focus position adjusting unit for use in a shadowless lighting device for medical purposes includes a sensor, a start switch, a start processor, and a direction adjuster. The unit also includes a focus mover, a peak detector, and an adjustment completion unit. The shadowless lighting device for medical purposes has a housing, illuminating bulbs arranged in the housing, and a drive system for inclining the illuminating bulbs so that the optical axes of the illuminating bulbs may converge, and form a focus, on a predetermined position along a focus moving axis. The automatic focus position adjusting unit permits, with a simple operation, an accurate focus position adjustment at a desired position. This is because it is possible to move the focus to a position at which the amount of light, reflected from the predetermined region at the center of the range of light, becomes a maximum.

REFERENCES:
patent: 4578575 (1986-03-01), Roos
patent: 4639838 (1987-01-01), Kato et al.
patent: 4884008 (1989-11-01), Bossler et al.

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