Projection module and projector incorporating same
View Patent ↗A projection module intended to project an image on a screen defining a specified projection plane is disclosed. The module includes an objective, for emitting an imaging beam; a curved mirror; and at least two deflection surfaces for deflecting the imaging beam, the deflection surfaces being placed in the path of the imaging beam between the objective and the curved mirror.
1. Projection system, comprising:
an illumination means that generates an illumination beam;
an imager that creates an imaging beam from the illumination beam, the imaging beam being representative of an image;
a projection module intended to project the image on a screen defining a specified projection plane, said module comprising:
an objective for refracting the imaging beam, having a refractive portion comprising lenses; and
a curved mirror for deflecting the imaging beam, which is located below the optical axis of the objective,
at least two plane deflection surfaces for deflecting the imaging beam emanating from the objective, these plane surfaces being placed in the path of the imaging beam between the objective and the curved mirror,
wherein the curved mirror is:
either a hyperbolic mirror which is placed on the exit side of the objective in such a way that the axis of the hyperbola passing through the foci of the hyperbola coincides with the optical axis the objective, or
an aspheric mirror having an axisymmetric shape defining an optical axis that coincides with the optical axis of the objective.
2. Projection system according to claim 1 , wherein the projection system comprises a projection screen, the projection module illuminating the projection screen via the rear.
3. Projection system according to claim 1 , wherein the angle between the optical axis of the objective and the projection plane does not exceed 10°.
4. Projection system according to claim 3 , wherein, when the projected image is rectangular, the angle between the optical axis of the objective and the long side of the image projected on the screen does not exceed 10°.
5. Projection system according to claim 3 , wherein, when the projected image is rectangular, the angle between the optical axis of the objective and the short side of the image projected on the screen does not exceed 25°.