Patent ID: 7551377
Filing Date: 2009-06-23
Classification: G02B,G03B

Abstract:
1. A projection display apparatus in which a projection lens barrel is capable of being interchanged; the projection display apparatus comprising: a rotation regulating element for inhibiting a rotation in a tightening direction of a mount ring for fixing said projection lens barrel to said projection display apparatus; a stopper element displaceable between a non-locked position for allowing the rotation of said mount ring and a locked position for inhibiting the rotation of said mount ring in a loosening direction, and biased from said non-locked position to said locked position by a biasing element; and an engagement element, arranged on said mount ring, for displacing said stopper element to the non-locked position against a bias by said biasing element by contacting a front end of said stopper element when said mount ring is rotated to a rotating position in the loosening direction from a predetermined position to be tightened, and being released from contact with said stopper element and engaging said stopper element displaced to said locked position in the loosening direction of said mount ring when said mount ring is rotated to said predetermined position.