The invention discloses a starry
sky projection lamp. The starry
sky projection lamp comprises a multi-color
light source array, an
optical path, a first diaphragm, a second diaphragm, a collimating lens and a reflector array which are sequentially arranged along
optical path, and further comprises a support for installing the multi-color
light source array, the first diaphragm and the second diaphragm, the multi-color
light source array comprises at least two light sources which are arranged in a spaced mode and are different in color, the first diaphragm is provided with a
first light passing hole which is in one-to-one correspondence with the light sources in the multi-color light source array and is smaller than the light-emitting surface of the corresponding light source, a second light passing hole corresponding to the
first light through hole one to one is formed in the second diaphragm, and the minimum incidence angle of the light source projected to the
first light passing hole corresponding to the adjacent light source is larger than half of the collection angle of the light
ray of the second light passing hole corresponding to the first light passing hole. According to the starry
sky projection lamp, the starry sky projection effect of multiple colors can be achieved, more projection requirements can be met, the size of the light spots can be reduced, more
stars areprojected,
stray light emitted from the first light passing hole is well shielded, and the starry projection effect is improved.