Patent ID: 7210244
Filing Date: 2007-05-01
Classification: G01B

Abstract:
1. A distance calculating apparatus calculating a real distance from a map distance of a map path connecting a first point and a second point on a map, the apparatus comprising: a housing; a scale input unit into which a reduced scale is input, disposed in the housing; an optical sensor unit disposed in the housing, the optical sensor unit sensing a movement of the housing using light and outputting an electrical signal when the housing is moved along the map path; a calculation unit disposed in the housing, the calculation unit calculating the map distance using the electrical signal input from the optical sensor unit and calculating the real distance using the map distance and the reduced scale input from the scale input unit; and a display unit disposed in the housing, the display unit displaying the real distance calculated by the calculation unit, wherein the optical sensor unit comprises; a light emitter emitting light; a light receiver sensing light reflected after being emitted from the light emitter; and a conversion and output unit converting variations in the light sensed by the light receiver into an electrical signal and outputting the electrical signal when the housing is moved, wherein the housing has a pen shape, and the light emitter is disposed at the lower portion of the housing, and the light emitted from the light emitter is incident on and reflected from the map.