The invention relates to a stage lamp optical
system with a mutually-switched pattern and
light beam effect. The stage lamp optical
system comprises a
light source component, a pattern component and a
zoom lens component which are positioned in the same main
optical axis direction and can emit spot light, and also comprises an optical
integrator component which can be switched into the main
optical axis, wherein the pattern component comprises a
light beam pattern component and a graph pattern component which can switch mutually and enter the main
optical axis; the
light source component can move forward and backward relative to the pattern component along the main optical axis; when the
light source component is moved forward to the first position relative to the pattern component, only the
light beam pattern component is switched into the main optical axis; the light rays of the light source component are emitted through the light
beam pattern component and the
zoom lens component; when the light source component is moved backward to the second position relative to the pattern component, the optical
integrator component and the graph pattern component enter the main optical shaft at the same time, and the light rays are emitted through the optical
integrator component, the graph pattern component and the
zoom lens component. The stage lamp optical
system with the mutually switched patterns and light beams has the advantages of low optical loss, high
utilization rate and the like.