Optical module and projection apparatus

A projection apparatus comprising an illumination system, a light valve, a projection lens, and an optical module, wherein

• the illumination system is configured to emit an illumination light beam,
• the light valve is located on a transmission path of the illumination light beam and is configured to convert the illumination light beam into an image light beam,
• the projection lens is located on a transmission path of the image light beam and is configured to project the image light beam, and
• the optical module is disposed between the light valve and the projection lens and comprises a base, a first frame, an optical element and at least one driving assembly, wherein
• the first frame is disposed in the base,
• the optical element is disposed in the first frame, and
• the at least one driving assembly is disposed between the base and the first frame, wherein the first frame is configured to move relative to the base by a magnetic force generated by the at least one driving assembly, each of the at least one driving assembly comprises a coil and a Halbach array magnet structure, the coil and the Halbach array magnet structure face each other along a first direction, a width of the Halbach array magnet structure in the first direction is W1, a width of the coil in the first direction is W2, and 0.7≤W1/W2≤2.