Projection-based decorative lamp

1. A projection-based decorative lamp, comprising a decorative shell, the decorative shell being made of a translucent plastic material, and further comprising a projection assembly, the projection assembly being provided inside the decorative shell, wherein a first projection chamber and a second projection chamber are provided within the projection assembly; the first projection chamber comprises a first shape hole formed on a front wall and a first light source formed on a rear wall, and the second projection chamber comprises a second shape hole formed on a front wall and a second light source formed on a rear wall; the first light source illuminates the first shape hole to project a first shape onto the decorative shell, and the second light source illuminates the second shape hole to project a second shape onto the decorative shell; a center point of the first shape is the same as a center point of the second shape; an alternating switch of the first light source and/or the second light source enables the interaction and variation between the first shape and the second shape;

wherein the decorative shell is in a shape of a pumpkin, the first shape hole represents an open-mouth shape, and the second shape hole represents a closed-mouth shape; the first shape and the second shape flash alternately to achieve a projection effect of opening and closing the mouth;

wherein the projection-based decorative lamp further comprises a third projection chamber, wherein the third projection chamber is provided adjacently above the second projection chamber; third shape holes and a third light source are formed respectively on a front wall and a rear wall of the third projection chamber on a same horizontal line; the third light source illuminates the third shape holes to forwardly project a third shape onto the decorative shell.

2. The projection-based decorative lamp according to claim 1 , wherein the second projection chamber and the first projection chamber are provided adjacently in a vertical arrangement; the first light source and the first shape hole are formed on a same horizontal line, forming a forward projection; the second light source is positioned horizontally higher than the second shape hole, forming a downward projection.

3. The projection-based decorative lamp according to claim 1 , wherein the second projection chamber and the first projection chamber are provided adjacently in a vertical arrangement; the first light source is positioned horizontally lower than the first shape hole, forming an upward projection; the second light source is positioned horizontally higher than the second shape hole, forming a downward projection.

4. The projection-based decorative lamp according to claim 1 , wherein the second projection chamber and the first projection chamber are provided adjacently in a vertical arrangement; the first light source is positioned horizontally lower than the first shape hole, forming an upward projection; the second light source and the second shape hole are formed on a same horizontal line, forming a forward projection.

5. The projection-based decorative lamp according to claim 1 , wherein the third shape holes consist of three triangles forming eyes and a nose.

6. The projection-based decorative lamp according to claim 5 , further comprising a circuit board, wherein the circuit board is installed on the projection assembly; several LED beads are provided on the circuit board, and the LED beads provide a projection light source for the projection assembly.

7. The projection-based decorative lamp according to claim 6 , wherein the circuit board is electrically connected with a wire, and the wire enables a series connection or a parallel connection of a plurality of the projection assemblies.

8. The projection-based decorative lamp according to claim 7 , wherein a clamping piece is provided on an upper edge of the projection assembly; the clamping piece securely connects the projection assembly to an opening of the decorative shell provided outside the projection assembly.