×

PROJECTION OPTICAL SYSTEM AND IMAGE PROJECTION DEVICE

  • US 20130235356A1
  • Filed: 05/09/2011
  • Published: 09/12/2013
  • Est. Priority Date: 05/18/2010
  • Status: Active Grant
First Claim
Patent Images

1. A projection optical system projecting images on a surface to be projected on, the projection optical system comprising:

  • a first optical system including at least one refraction optical system and having positive power as a whole;

    a folding mirror; and

    a second optical system including at least one reflection surface having power and having positive power as a whole;

    wherein the folding mirror folds a light path from the first optical system to the second optical system, in a plane including an optical axis of the first optical system and a normal line of the surface to be projected on, and the following conditional expressions (1) through (3) are satisfied
    0.43

    d
    1;





    (1)
    0.43

    d
    2; and





    (2)
    0.7

    d
    2/d1

    2.0, 



    (3)further d1 is expressed in the following equation (1)

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×