Patent ID: 8042957

Claim:
An image system having height adjustment device with fine tuning, the image system comprising: a housing; a lens set configured in the housing for casting an image onto a surface; and two height adjustment devices configured at the bottom of the housing respectively, the height adjustment device comprising: a base connected to the bottom of the housing; a transformation gear set configured on the base and having a first gear and a second gear, wherein the first gear and the second gear are in-line gears and the pitch diameter of the first gear is larger than the pitch diameter of the second gear; a supporter capable of moving relative to the base and having a rack for engaging with the second gear of the transformation gear set; and an actuator configured on the base for detachably engaging with the first gear of the transformation gear set for stopping the first gear and the second gear; wherein when the actuator disengages from the first gear and when the first gear rotates and has a first relative distance with the actuator, the second gear rotates and has a second relative distance with the racks and the first relative distance is longer than the second relative distance.