초록 ▼

A radiation focussing device has a reflecting surface which is at least part of a surface of revolution which is generated by a rotation of an arc of a parabola about a rotational axis. This axis is in the plane of the parabola, passes through the parabola focus and is at a non-zero angle, preferabl

A radiation focussing device has a reflecting surface which is at least part of a surface of revolution which is generated by a rotation of an arc of a parabola about a rotational axis. This axis is in the plane of the parabola, passes through the parabola focus and is at a non-zero angle, preferably 90°to the principal axis of the parabola. The arc lies on the opposite side of the rotational axis from the vertex of the parabola. When combined with a conical mirror this focussing device can focus parallel incoming rays.

대표청구항 ▼

An astronomical optical telescope for receiving radiant energy from sources external thereto having: a symmetry axis, an eyepiece located at said symmetry axis, a first reflecting surface extending circumferentially around said symmetry axis, facing towards said symmetry axis and being part of a sur

An astronomical optical telescope for receiving radiant energy from sources external thereto having: a symmetry axis, an eyepiece located at said symmetry axis, a first reflecting surface extending circumferentially around said symmetry axis, facing towards said symmetry axis and being part of a surface of a cone coaxial with said symmetry axis, said first reflecting surface being oriented to receive radiant energy from sources external to said telescope, and a second reflecting surface which is a focussing surface and is at least part of a surface of revolution generated by rotation of a parabolic arc about said symmetry axis, said parabolic arc belonging to a parabola having a principal axis which is at a non-zero angle q90-qdegrees and (ii) the axial position of said second reflecting surface is positioned relative to said first reflecting surface such that rays of radiation which are parallel to said symmetry axis and incident upon said first reflecting surface are reflected from said second reflecting surface convergently, said eyepiece being located so as to receive said rays of radiation reflected from said second reflecting surface.