US 12,078,320 B1
Stage light fixture with high-stable rotational positioning
Yingru Peng, Guangzhou (CN); Weikai Jiang, Guangzhou (CN); Xianwen Mai, Guangzhou (CN); and Wenfeng Chen, Guangzhou (CN)
Assigned to GUANGZHOU HAOYANG ELECTRONIC CO., LTD., Guangzhou (CN)
Filed by Guangzhou Haoyang Electronic Co., Ltd., Guangzhou (CN)
Filed on Nov. 29, 2023, as Appl. No. 18/522,934.
Claims priority of application No. 202322032751.9 (CN), filed on Jul. 31, 2023.
Int. Cl. F21V 14/02 (2006.01); F21V 21/06 (2006.01); F21V 21/108 (2006.01); F21V 23/00 (2015.01); H02K 1/18 (2006.01); H02K 1/22 (2006.01); F21W 131/406 (2006.01)
CPC F21V 14/02 (2013.01) [F21V 21/06 (2013.01); F21V 21/108 (2013.01); F21V 23/009 (2013.01); H02K 1/18 (2013.01); H02K 1/223 (2013.01); F21W 2131/406 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A stage light fixture with high-stable rotational positioning, comprising:
a base;
a pivoting arm pivoted to the base through a pivoting shaft; and
a light head pivoted to the pivoting arm through another pivoting shaft,
wherein light beams emitted from the light head are projected in different angles via rotation of the light head and the pivoting arm respectively driven by a motor,
further comprising an angular detector for detecting a rotation angle of the light head and/or the pivoting arm, which includes
a stator assembly having a magnet exciting coil which is adapted to form an alternating magnetic field in a region of the stator assembly by high-frequency periodic alternating current and voltage and a receiving coil arranged in the alternating magnetic field which is adapted to form an induced electromotive force; and
a rotor assembly which is configured to change electromagnetic coupling strength between the magnet exciting coil and the receiving coil during rotation thereof relative to the stator assembly.