Laser beam device with apertured reflective element

A construction tool for producing a plurality of light beams on intersecting lines, comprising:

• a light source providing a non-collimated beam of laser light;
• a collimating lens disposed to intercept and collimate less than the entire beam;
• and
• a unitary reflective element defining a central aperture, at least two planar reflective surfaces having a first reflectivity outward of the aperture, and other sections having a second reflectivity outward of the aperture in-between the reflective surfaces, the normal to each reflective surface being oriented at 45° to the collimated portion of the beam and 90° from the normal to the other reflective surface when measured in a plane perpendicular to the collimated beam, wherein the unitary reflective element is positioned in the path of the collimated part of the beam to pass, without reflection, a center portion of the collimated beam through the central aperture and to reflect outer portions of the collimated beam from the reflective surfaces, the passed beam and at least two of the reflected beams being mutually orthogonal.

A construction tool for producing a plurality of light beams on intersecting lines, comprising:

• a light source providing a non-collimated beam of laser light;
• a collimating lens disposed to intercept and collimate less than the entire beam;
• and
• a unitary reflective element defining a central aperture, at least two planar reflective surfaces outward of the aperture, and other sections outward of the aperture in-between the reflective surfaces, the normal to each reflective surface being oriented at 45° to the collimated portion of the beam and 90° from the normal to the other reflective surface when measured in a plane perpendicular to the collimated beam, wherein substantially parallel edges define the boundaries between each reflective surface and the other in-between sections adjacent to each reflective surface, and wherein the unitary reflective element is positioned in the path of the collimated part of the beam to pass, without reflection, a center portion of the collimated beam through the central aperture and to reflect outer portions of the collimated beam from the reflective surfaces so that the passed and the at least two reflected beams are mutually orthogonal, wherein the outer portions of the collimated beam impinge across both substantially parallel facet edges of at least one of the reflective surfaces.