Light source system, projection device, and adjustment method of position of light emitting unit

A projection device, comprising a light source system, a light combining base, a light transmission module, an optical-mechanical module, and a lens module, wherein:

• the light source system is disposed on the light combining base, the light transmission module is disposed in the light combining base, the light source system is configured to provide at least one color beam, the light transmission module is disposed in a transmission path of the at least one color beam, the light transmission module is configured to transmit the at least one color beam to form an illumination beam, the optical-mechanical module is disposed in a transmission path of the illumination beam, the optical-mechanical module is configured to convert the illumination beam into an image beam, the lens module is disposed in a transmission path of the image beam and is configured to project the image beam out of the projection device, and the light source system comprises a light source module and a positioning module, wherein:
• the light source module is configured to provide the at least one color beam, and the light source module comprises a light emitting unit and a heat dissipating module, wherein the light emitting unit is fixed onto the heat dissipating module, and the heat dissipating module has a first locking hole extending along a first extension direction;
• and
• the positioning module comprises a frame and a first positioning assembly, wherein the first positioning assembly corresponds to the first locking hole, the frame is fixed onto the light combining base and is located between the light combining base and the light source module, the first positioning assembly comprises a first positioning element and a first limiting member, the first limiting member is adapted to be fixed onto the frame to limit a part of the first positioning element between the first limiting member and the frame, the first positioning element is disposed through the frame along the first extension direction and is screwed into the first locking hole of the heat dissipating module, and the part of the first positioning element is adapted to have different distances relative to the heat dissipating module, so that the light emitting unit has different positions relative to the light combining base in the first extension direction.

An adjustment method of a position of a light emitting unit, comprising following steps of:

• fixing the light emitting unit onto a heat dissipating module;
• fixing a frame onto a light combining base;
• disposing a first positioning element in a first positioning assembly through the frame along a first extension direction to be screwed into a first locking hole of the heat dissipating module, and fixing a first limiting member in the first positioning assembly onto the frame, so that a part of the first positioning element is limited between the first limiting member and the frame;
• and
• rotating the first positioning element to drive the heat dissipating module to move relative to the light combining base along the first extension direction to adjust the position of the light emitting unit relative to the light combining base.