Patent ID: 6441887
Filing Date: 2002-08-27
Classification: G01C,G01S

Abstract:
A light transmitting device comprising:a transmitter; a telescope including: an object lens unit; an eye lens unit; and a prism unit disposed between the object lens unit and eye lens unit, to provide an optical axis for light beams; wherein the optical axis includes a front portion defined from a target through the object lens unit to the prism unit, a refraction portion inside the prism unit, a first rear portion and a second rear portion outside the prism unit; wherein a visible light beam travels along the front portion and enters the prism unit, then reflects inside and emerges out from the prism unit, and thereafter travels along the first rear portion; wherein an invisible light beam emitted from the transmitter travels along the second rear portion and enters the prism unit, then reflects inside and emerges out from the prism unit, and thereafter travels along the front portion; and wherein the second rear portion contains a predetermined angle respectively with the front portion.