Patent ID: 7845830
Filing Date: 2010-12-07
Classification: F21V

Abstract:
1. An adjustable lighting device comprising: a light source; a reflector for reflecting light from the light source; a coil of nonlinear thread coiling around the reflector, the coil of nonlinear thread coiling and the reflector being in a fixed positional relationship; and a driving wheel frictionally engaging with the coil of nonlinear thread, the driving wheel adapted to drive the coil of nonlinear thread to rotate thereby adjusting the position of the reflector; two supporting wheels along with the driving wheel providing a three-point support for the coil of nonlinear thread; a first motor adapted to drive the driving wheel; a shaft on which the light source is supported; and a second motor adapted to the shaft axially along an axis of the shaft thereby moving the light source in or out of a focal point of the reflector.