PROJECTION OPTICAL DEVICE

摘要

The projective optical device having a cathode ray tube and an optical coupler comprises first and second lenses arranged at the front of the optical coupler; and a third lens arranged between the cathode ray tube and the optical coupler, the first and second lenses being composed of two spherical lenses with optical power and two non-spherical lenses and the third lens and the cathode ray tube are formed to be able to move front and rear and tilt along an optical axis.