Patent ID: 6373640
Filing Date: 2002-04-16
Classification: G02B,H04N

Abstract:
An optical system which can be switched between a first optical path, a second optical path, and a third optical path, said system comprising:(A) an objective lens unit having a positive optical power; (B) an erector lens unit having a positive optical power; (C) an eye lens unit having a positive optical power; (D) a sensor unit; (E) a display unit; and (F) optical means for switching the optical system between said first, second, and thrid optical paths; â€ƒwherein (i) the first optical path comprises, in order, the objective lens unit, the erector lens unit, and the eye lens unit; (ii) the second optical path comprises, in order, the display unit and the eye lens unit; and (iii) the tird optical path comorises, in order, the objective lens unit and the sensor unit.