| 摘要 |
A projector includes a projection unit located in a shell provided on a vehicle. The projection unit includes a light, a screen, a convex-convex lens and a plane-convex lens. The screen is located in front of the light. The convex-convex lens is located in front of and separated from the screen. The plane-convex lens is located in front of and separated from the convex-convex lens. The light casts light onto the ground in an area beside the vehicle through the screen so that a sign is shown on the ground.
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