MOVING HEAD LIGHT FIXTURE WITH YOKE AND HEAD POSITION ENCODING MEANS

摘要

The present invention relates to a moving head light fixture comprising: a base; a yoke rotatable connected to the base; a head rotatable connected to the yoke. The head comprises at least one light source generating light. An actuator is adapted to rotate the yoke or the head. Magnetic means is attached to the axel of the actuator and generated a magnetic field, which is perpendicular to the actuator axel. A magnetic encoder is fixed in relation to the axel and provides at an axel position signal based the magnetic field is indicative of the angular position of the axel in relation to the magnetic encoder. Indication means provides an indication signal when the yoke or head is positioned at a number of predetermined angular positions in relation. Processing means are adapted to control the moving head light fixture based on the actuator axel position signal and the indication signal.

主权项

1. A moving head light fixture comprising:
a base; a yoke rotatably connected to said base; a head rotatably connected to said yoke, said head comprises at least one light source generating light; at least one actuator adapted to rotate at least one of said yoke around a yoke axis and said head around a head axis; a position sensor providing at least one position signal indicative of at least the position of said yoke in relation to said base or the position of said head in relation to said yoke; a processing device adapted to control said actuator based on said at least one position signal;wherein said position sensor comprises:
a magnetic element attached to an axel of said at least one actuator, said magnetic element generating a magnetic field, said magnetic field is substantially perpendicular to said axel of said at least one actuator; a magnetic encoder fixed in relation to said axel of said at least one actuator; said magnetic encoder provides at least one actuator axel position signal based on said magnetic field, and said at least one axel position signal is indicative of the angular position of said axel of said actuator in relation to said magnetic encoder; an indicator providing an indication signal when said yoke is positioned at a number of predetermined angular positions in relation to said base or when said head is positioned a number of predetermined angular positions in relation to said yoke;wherein said at least one position signal comprises said actuator axel position signal and said indication signal.