Optics: image projectors – Lens support – Lens position adjustable
Patent
1983-09-28
1984-11-13
Frankfort, Charles
Optics: image projectors
Lens support
Lens position adjustable
353 70, G03B 2100
Patent
active
044822243
ABSTRACT:
This invention relates to a device at projectors, which are provided with a lens barrel (1) vertically movable perpendicularly to the optic axis of the lens, and with a lighting arrangement (12), which is mounted rotatably and coupled via one or several hinged arms to the moving means for the lens barrel, so that optimum lighting through the slide to the lens is obtained. According to the invention, the hinged arm comprises two co-operating portions, a lens arm (3) and a lighting arm (13). The lens arm extends from a guide pin (2) on the lens barrel rearward to the slide plane where it is hingedly united with a sector arm (5). The joint (4) between the lens arm (3) and sector arm (5) is rigidly connected to the sector arm and in the lens arm (3) movable in a groove (8). The lighting arm extends from the lighting arrangement (12) forward to and a distance past the slide plane. In the slide plane the lighting arm is pivotally mounted in a joint (4 ) attached on the projector chassis. At its forward end pointing to the lens barrel, the lighting arm (13) is hingedly connected to the lens arm (3). By changing the position of the joint (4) between the sector arm (5) and lens arm (3) in the groove (8), a change in the transmission ratio between the movements of the lens arm (3) and lighting arm (13) is obtained, so that upon vertical movement of the lens barrel the light from the lighting arrangement (12) through the slide enters at different angles the lens, adjusted to the position of its focal plane and entrance pupil.
REFERENCES:
patent: 1952522 (1932-03-01), Warmisham
patent: 1954876 (1933-04-01), Joannides
patent: 2679784 (1954-06-01), Simmon
patent: 3963337 (1976-06-01), Lundberg
Frankfort Charles
Matecki Thomas P.
Victor Hasselblad Aktie Bolag
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