| 摘要 |
<p>PURPOSE:To expand the range of the angle where reflected luminous flux can be detected by providing a reflecting tape which reflects luminous flux converged into spot-shaped parallel light by modulation recursively almost in the incidence direction and photoelectric detectors which detect the reflected luminous flux. CONSTITUTION:This luminous flux forming device is equipped with a luminous flux generation source 1 which generates modulated luminous flux, a lens 2 which converges the luminous flux into spot-shaped parallel light, half-mirrors 3 and 5 which distribute the luminous flux in two directions, cylindrical lenses 4 and 6 which diffuse the reflected luminous flux into pieces of luminous flux crossing each other at right angles, a reflection mirror 7 for the luminous flux passed through the half-mirrors 3 and 5, a lens 8 which converges its reflected luminous flux into spot-shaped parallel light, the reflecting tape 13 which reflects the spot-shaped luminous flux 23 recursively, and photoelectric detectors 11 which detect its reflected luminous flux. Therefore, a patient is easily positioned with a cross-shaped intersection 25 at the time of radiation treatment or diagnosis, and the reflected luminous flux 24 from the reflecting tape 13 stuck on a plane which is not perpendicular to the luminous flux such as the noise or chin of the patient is detected at a high S/N by the photoelectric detectors 11 with the modulated luminous flux 23.</p> |
