Video projection system
OwnerFrederick Jean-Pierre Demoleinventor
Life of this patent
Estimating the term…
Abstract
A video projection system (50) comprises a rotary disc (31) having light guiding devices (35) extending radially thereof and in a helical configuration circumferentially at the disc (31) and corresponding in number to the number of lines to be scanned on a screen (48) the arrangement being such that, as the disc (31) rotates, a light bundle is directed through successive devices (35) which cause the bundle to be scanned on the screen (48).
Claims8
A video projection system (30) comprising means (36, 46) for generating a colour light bundle coloured according to a video signal and means (31, 35) for line scanning the bundle onto a screen (48) thereby producing images on the screen (48), the system (30) also including a disc (31) adapted to rotate on an axis (32) extending through a centre of the disc (31) and at right angles to the plane of the disc (31) characterised in that the disc (31) carries a plurality of light guiding devices (35) extending radially of the disc (31) and spaced one from another in an angular direction in the plane of the disc (31) and each device (35) extending at an angle to the plane of the disc (31) in a corresponding plane perpendicular to the plane of the disc (31) so that each device (35) projects a corresponding one of the lines scanning a video image on to the screen (48).
A video projection system (50) as claimed in claim 5 characterised in that the toroidal mirror (51) is provided with a slot (52) which is arranged so that the light bundle incident on the concave spherical mirror (53) passes through the slot (52).
Dependencies are inferred from the claim text.