Patent ID: 6623124
Filing Date: 2003-09-23
Classification: G03B

Abstract:
A projection type illuminating device comprising:an illuminator main body for performing radiation by a light source; a condenser lens barrel part removably attached to a tip of said illuminator main body, said condenser tens barrel part having a condenser lens; a mask part disposed in front of said condenser lens barrel part and removably attached to a tip of said condenser lens barrel part and including a shading plate having therein at least one partially transparent part; and a focus adjusting lens barrel part, said mask part having a first cooperating part and said focus adjusting barrel pan having a second cooperating part such that said focus adjusting lens barrel part is movably attached to said mask part in a state of covering said mask part such that said focus adjusting lens barrel part is contractible toward and expandable from said illumination main body over said mask part, said focus adjusting lens barrel part having a focus adjusting lens; wherein a shape of the at least one partially transparent part of the shading plate is projected by focusing light from said illuminator main body backwardly radiated on and passing through said condenser lens and the shading plate of said mask part by using said focus adjusting lens barrel part.