Projector and projection positioning method

A projector, comprising:

• a projector body, comprising a projection lens configured to play a projection content with a preset area;
• a first ranging sensor provided on the projector body and configured to collect position data of a target object within a projection calibration frame formed by the projection lens;
• a processor provided on the projector body and at least configured to calculate area data of an adjusted projection calibration frame based on the position data;
• and
• a focal length controller communicated with the processor and configured to adjust a focal length of the projection lens according to the area data to change an area of the projection calibration frame played by the projection lens,
• wherein the projector body further comprises a projection module configured to project and a positioning module configured to position the projection calibration frame, and the projection module and the positioning module are independent with each other;
• the processor and the projection lens are provided on the projection module, and the first ranging sensor is provided on the positioning module;
• and
• an orthographic projection of the positioning module and an orthographic projection of the projection module coincide with each other,
• wherein the positioning module is provided with a plurality of second ranging sensors facing the projection module, and the plurality of second ranging sensors are dispersedly provided on a side of the positioning module facing the projection module.