Disclosed herein is a lens module for a projector of laser scanning type which is focus-free and has a short throw distance. Disclosed also herein is such a projector.
The lens module disclosed herein includes a first optical member including a free-curved lens that passes a beam light reflected by a minute vibrating mirror; and a second optical member including a free-curved mirror to reflect the beam light which has passed through the first optical member, or a free-curved lens to pass the beam light which has passed through the first optical member. The beam light, which has been reflected by or has passed through the second optical member, has at the same position beam waists in horizontal and vertical directions perpendicular to a propagating direction of the beam light and also has beam radii coinciding in the horizontal and vertical directions. The lens module disclosed herein can be applied to a projector of laser scanning type.