Three-dimensional object-measurement device, medium, and control method

A three-dimensional object-measurement device comprising:

• a laser beam irradiation unit which irradiates a laser beam;
• a focal length changing unit which has a first focal length changing unit which changes a focal length of the laser beam on a first axis on a plane perpendicular to an irradiation direction of the laser beam and a second focal length changing unit which changes, on a second axis being an axis different from the first axis on the plane, a focal length of the laser beam passing the first focal length changing unit;
• an imaging unit which images a reflected light which is a reflection of the laser beam on an object, and generating image data;
• a control unit which sets different focal lengths to the first focal length changing unit and the second focal length changing unit by controlling the focal length changing unit, and obtains the image data;
• and
• a distance calculation unit which calculates a distance to the object based on the image data.

A computer readable non-transitory medium embodying a program, the program causing a three-dimensional object-measurement device to performs a method, the method comprising:

• irradiating a laser beam;
• changing a focal length of the laser beam;
• imaging a reflected light which is a reflection of the laser beam on an object and generating image data;
• changing a focal length
• irradiating the same point on an object to be measured with the laser beam a plurality to times while varying a focal length;
• generating the image data;
• and
• calculating a distance to the object to be measured by processing the plurality of image data.

A control method to be executed by a three-dimensional object-measurement device which measures a distance to an object to be measured, comprising:

• irradiating a laser beam;
• changing a focal length of the laser beam;
• imaging a reflected light which is a reflection of the laser beam on an object and generating image data;
• changing a focal length;
• irradiating the same point on an object to be measured with the laser beam a plurality of times while varying the focal length;
• generating the plurality of image data;
• and
• calculating a distance to the object to be measured by processing the plurality of image data.