Optical projector including photo-sensitive device

Claim 2

An optical projector comprising a lens, a plane mirror, integral support means supporting said lens and mirror in a position in which said mirror lies on and is inclined with respect to the optical axis of said lens, a light source, means for adjustably mounting said light source on said support means laterally of said optical axis in a position such that light rays from said light source are reflected by said mirror through said lens, a back plate adapted to be fixed to a stationary object, means for adjustably fastening said integral support means to said back plate, said adjustable fastening means comprising adjustment means accessible from the side of said integral support means remote from said back plate when said support means is fastened thereto and a photosensitive device in said projectOr responsive to reflected light.

Claim 3

An optical projector as claimed in claim 1 said photosensitive device being on said optical axis on the same side of said lens as said lens as said mirror and in which said lens is a composite lens formed from two coaxial lenses of different diameters, each having a plane face, said coaxial lenses being cemented together along said plane faces, the outer annular part of said composite lens being adapted to form an emitted beam from light reflected to said outer part by said mirror, and the inner part of said composite lens being adapted to focus the light from said beam which is reflected back through said lens onto said photosensitive device.

Claim 4

An optical projector as claimed in claim 2 in which said photosensitive device is between the mirror and composite lens.

Claim 5

An optical projector as claimed in claim 2 in which said mirror is formed with a recess at said optical axis, and said photosensitive device is mounted in said recess directly on said integral support.

Claim 6

An optical projector comprising a lens, a plane mirror positioned on the optical axis of said lens and inclined with respect to said axis, a light source positioned laterally of said axis in a position such that light rays from said light source are reflected by said mirror through said lens, and a photosensitive device on said optical axis on the same side of said lens as said mirror, and in which said lens is a composite lens formed from two coaxial lenses of different diameters, each having a plane face, said coaxial lenses being cemented together along said plane faces, the outer annular part of the larger of said coaxial lenses being adapted to form an emitted beam from light reflected therethrough by said mirror, and the inner part of said composite lens being adapted to focus the light from said beam which is reflected back through said lens onto said photosensitive device.

Claim 7

An optical projector comprising a lens, a plane mirror positioned on the optical axis of said lens and inclined with respect to said axis, a light source positioned laterally of said axis in a position such that light rays from said light source are reflected by said mirror through said lens, and a photosensitive device on said optical axis on the same side of said lens as said mirror, and in which said lens is a composite lens formed from two coaxial lenses of different diameters, each having a plane face, said coaxial lenses being cemented together along said plane faces, the outer annular part of the larger of said coaxial lenses being adapted to form an emitted beam from light reflected therethrough by said mirror, and the inner part of said composite lens being adapted to focus the light from said beam which is reflected back through said lens onto said photosensitive device.