Projector, projection unit and interactive board

A projector comprising:

• a body including a projection optical system, the projection optical system projecting image light;
• and
• a projection unit that projects the image light projected from the projection optical system toward an illumination-targeted plane,
• the projection unit including
• a variable magnification optical system that converts a magnification of an image by the image light;
• and
• an angle-widening mirror that reflects the image light from the variable magnification optical system for angle-widening, and
• the variable magnification optical system that converts a magnification of an image forming an image plane inclined to an optical axis of the projection optical system.

A projector comprising:

• a body including a projection optical system, the projection optical system projecting image light;
• and
• a projection unit that projects the image light projected from the projection optical system toward an illumination-targeted plane,
• the projection unit including an angle-widening mirror that reflects the image light from the projection optical system for angle-widening,
• the projection optical system acting as a variable magnification optical system, the variable magnification optical system converting a magnification of an image by the image light, and
• the variable magnification optical system converting a magnification of an image forming an image plane inclined to an optical axis of the projection optical system.

A projection unit which is used in combination with a body including a projection optical system which projects image light, and projects the image light projected from the projection optical system toward an illumination-targeted plane, comprising:

• a variable magnification optical system which converts a magnification of an image by the image light projected from the projection optical system;
• and
• an angle-widening mirror which reflects the image light from the variable magnification optical system for angle-widening,
• wherein the variable magnification optical system converts a magnification of an image forming an image plane inclined to a normal line of an optical axis of the projection optical system.