VISIBLE-LIGHT LASER PROJECTION APPARATUS

PROBLEM TO BE SOLVED: To obtain spot light whose visibility is good by a method wherein a light- condensing means and a light-shielding mask which are installed inside a laser beam when the laser beam is directed to a prescribed reference direction in an apparatus by which the laser beam is turned and irradiated so as to form a prescribed plane. SOLUTION: In a visible-light laser projection apparatus which is used for construction work and which forms a reference face in the vertical direction, e.g. a rotary head 3 which radiates a laser beam 3A in a direction at right angles to a shaft is provided at the front of a body 1, two leveling screws 2A, 2B or the like are provided at the lower part of the body 1, bubble tubes 4 in two axial directions are provided on the surface, and a horizontal slide plate 5 which comprises a condensing means such as a convex lens 6 or the like is installed in the irradiation position of the laser beam 3A in a direction vertically just under the head 3. The beam 3A is changed into a high-luminance spot 3B so as to be projected, and an operation in which the beam is made to agree with the point of intersection of marking lines 7A, 7B is made easy. A Fresnel lens may be housed as the condensing means, and a light-shielding means in which a cross, a black dot or the like is formed may be used instead of the condensing means.