Patent ID: 6862098

Claim:
Apparatus for measuring displacement of a surface of a measuring object comprising: projecting means having one convergent lens, said projecting means scanning radiated light on the surface of the measuring object through the convergent lens to form an irradiation point on the surface of the measuring object; and light receiving means including a light receiving element with a light receiving plane for receiving measuring beams reflected at the irradiation point to form an image formation point on the light receiving plane, a lens array composed of plural condenser lenses having a uniform image formation characteristic around an optical axis thereof and arranged in a scanning direction of the radiated light for converging the measuring beams reflected at the irradiation point, and an imaging lens having a uniform image formation characteristic around an optical axis thereof for converging the measuring beams passing through the lens array to form the image formation point on the light receiving plane so that an amount of the displacement on the surface of the measuring object is obtained by using triangulation of light reflected on the surface of the measuring object after passing though said one convergent lens, passing through said lens array and imaging lens, and forming the image formation point on the light receiving plane, and a signal different according to a location of the image formation point on the light receiving plane.