OPERATIONSLEUCHTE.

摘要

The lamp has at least two variable geometry lamp units which are focussed onto the operating plane using a simple handgrip control on the side of the lamp. An ultrasonic ranging unit (5) monitors the change in subject distance and adjust the focus settings accordingly. The focus settings are obtained by tilting the lamps using a simple servo drive and a tilt monitor. A simple control addition prevents changes if the subject distance suddenly reduces e.g. monitoring of the surgeon's hands, but automatically follows increases in subject distance. The control circuit uses logic circuits, with the manual adjustment (31) overriding the automatic control (30). A feedback lags is included contg. a position motor (17) and an angle setter (20).