Patent ID: 7411660

Claim:
A laser straight ruler comprising: a beam scanner operative to scan a beam that forms a beam spot on an object; a position sensing device operative to receive a beam reflected by the object and operative to sense a position of the beam spot formed on the object; a signal processing unit operative to drive the beam scanner and operative to process a signal sensed by the position sensing device to determine a change in a distance between the beam scanner and the object and to obtain a measured distance; a display that displays a change in a distance between the beam scanner and the object and data including the measured distance value by receiving a signal from the signal processing unit; an input portion that inputs data including adjustment of a scanning width of the beam spot and setting of start and end positions of the measured distance; wherein the beam scanner, the position sensing device, the signal processing unit, the display, and the input portion are provided together on a single portable main body.