Lens, structured light projection device and 3D measurement device

A structured light projection device, comprising:

• a structured light illumination system comprising a light source and a light valve, wherein the light source is adapted to provide an illumination beam, and the light valve is adapted to convert the illumination beam into a structured beam;
• and
• a lens comprising a first lens group, a second lens group, and a third lens group arranged sequentially from an enlargement side to a reduction side, wherein the first lens group has a first optical axis, the second lens group has a second optical axis, the third lens group has a third optical axis, and the third optical axis is overlapped with a primary optical axis of the lens;
• the first lens group and the second lens group are adapted to rotate in opposite directions so that the first optical axis and the second optical axis are adapted to incline relative to the primary optical axis;
• and the first lens group is adapted to move towards a first side and a second side of the primary optical axis;
• wherein the light valve is located on the reduction side of the lens, the lens is adapted to project the structured beam onto a target surface located on the enlargement side of the lens, and the primary optical axis of the lens is overlapped with a normal vector of a center of an active surface of the light valve.

A 3D measuring device, comprising:

• a structured light illumination system comprising a light source and a light valve, wherein the light source is adapted to provide an illumination beam, the light valve adapted to convert the illumination beam into a structured beam;
• a lens comprising a first lens group, a second lens group, and a third lens group arranged sequentially from an enlargement side to a reduction side, wherein the first lens group has a first optical axis, the second lens group has a second optical axis, the third lens group has a third optical axis, and the third optical axis is overlapped with a primary optical axis of the lens;
• the first lens group and the second lens group are adapted to rotate in opposite directions so that the first optical axis and the second optical axis are adapted to incline relative to the primary optical axis;
• the first lens group is adapted to move towards a first side and a second side of the primary optical axis;
• and the light valve is located on the reduction side of the lens, the lens is adapted to project the structured beam onto a target surface of the enlargement side located on the lens, and the primary optical axis of the lens is overlapped with a normal vector of a center of an active surface of the light valve;
• a beam-splitter arranged between the light valve and the third lens group, wherein the structured beam so that the structured beam is transmitted to the lens via the beam-splitter;
• and
• an image sensor arranged adjacent to the beam-splitter, wherein after a reflect beam reflected from the target surface passes through the lens, the reflection beam is provided to the image sensor via the beam-splitter.