LIGHT PROJECTING DEVICE AND SENSOR

摘要

An aperture angle beam (11) is emitted from a light emitting point (P), is refracted by a hemisphere surface (212a) of a lens (212), and reaches an incident end surface (180a) at an angle (?3) equal to the aperture angle of a light-projecting side optical fiber (180) with respect to an axis (X2) parallel to an optical axis (X).  An outer edge beam (12) is emitted from the light emitting point (P) and reaches an outer edge portion (184) of a core region (180b) via the lens (212).  The arrangement of a light emitting surface (162a), the lens (212), and the light projecting side optical fiber (180), and the refractive power of the lens (212) are selected so that the aperture angle beam (11) reaches within the core region (180b), or so that an angle (?3') of when the outer edge beam (12) has reached the outer edge portion (184) of the core region (180b) becomes not more than the aperture angle.