Lens module and projection device

A projection device, comprising:

• a light source configured to provide an illumination beam;
• a light valve disposed on a transmission path of the illumination beam and configured to convert the illumination beam into an image beam;
• and
• a lens module disposed on a transmission path of the image beam and configured to project the image beam out of the projection device, wherein the lens module comprises:
• a fixing seat having a side surface, and the side surface is provided with a first guide slot extended along a first axis;
• a moving assembly disposed on the side surface of the fixing seat, and the moving assembly comprises a first inclined surface;
• a lens unit fixed to the moving assembly;
• a first sliding member disposed on the side surface of the fixing seat along a second axis and connected to the moving assembly, wherein the first sliding member comprises a second inclined surface adjacent to the first inclined surface;
• a first knob disposed on the fixing seat and connected to the first sliding member, wherein the first knob is configured to drive the first sliding member to move relative to the fixing seat;
• and
• a first fixing member passing through the moving assembly and the first guide slot and fixed to the fixing seat, wherein
• when the first knob is rotated, the first sliding member is driven to move along the second axis, and the second inclined surface pushes against the first inclined surface, so that the moving assembly, together with the lens unit, is moved relative to the fixing seat along the first axis.