Laser straight ruler and method for measuring distance and projecting line using the straight ruler

A method for measuring a distance using a laser straight ruler, the method comprising:

• scanning a beam using a beam scanner onto an object to be measured;
• adjusting a scanning width of the beam scanned onto the object;
• setting scanning start and end points;
• continuously scanning between the set scanning start and end point;
• obtaining position data;
• sensing a posture of the beam scanner;
• displaying angle information of a sensed posture of the beam scanner;
• adjusting roll and pitch of the scanned beam to adjust scanning direction;
• and
• obtaining three-dimensional distance data by a triangulation method,
• wherein information on a distance with respect to a width of the object is obtained from the three-dimensional distance data.

A method for projecting a line using a laser straight ruler, the method comprising:

• scanning a beam using a beam scanner onto an object;
• setting a scanning start point of the beam;
• and
• receiving either information on a distance measured, where the distance measured is a distance of projection of the laser beam onto the object from the scanning staff point or information on a distance input through an input portion,
• sensing a posture of the beam scanner;
• displaying angle information of a sensed posture of the beam scanner;
• adjusting roll and pitch of the scanned beam to adjust scanning direction;
• and
• projecting the beam onto the object to form a line, the laser beam having a scanning width corresponding to either the measured distance or the input distance.