Stage light with capacitive rotation angle detection

A stage light with capacitive rotation angle detection, comprising:

• a pivoting member, which rotates around a rotating center line and comprises at least one light source producing projecting light beams;
• and
• a supporting member for pivoting and supporting the pivoting member,
• wherein a reflecting grating is attached on the pivoting member, which is configured to rotate along with the pivoting member,
• a signal grating is attached on the supporting member, the signal grating and the reflecting grating are arranged oppositely, and center lines of the signal grating and the reflecting grating are both coincident with the rotating center line of the pivoting member,
• the signal grating comprises a plurality of capacitance emitting pieces, a capacitance receiving piece, and a shielding piece that is located between the capacitance emitting pieces and the capacitance receiving piece for avoiding direct capacitance coupling between the capacitance emitting pieces and the capacitance receiving piece,
• the reflecting grating comprises a plurality of capacitance reflecting pieces that reflect signals sent from the capacitance emitting pieces to the capacitance receiving piece, and
• wherein the capacitance emitting pieces are divided into multiple groups, all the groups are equal in a number of the capacitance emitting pieces, a number of the capacitance reflecting pieces corresponds to a number of the groups of the capacitance emitting pieces, and the capacitance receiving piece is a single piece which is configured to receive all signals of the capacitance emitting pieces reflected by the capacitance reflecting pieces.