Optics: image projectors – Plural projection paths with single light source
Patent
1989-02-24
1991-03-19
Coles, Sr., Edward L.
Optics: image projectors
Plural projection paths with single light source
358474, 358496, 358498, H04N 1393
Patent
active
050015664
ABSTRACT:
The original documents of A4 or A3 format are selectively read by a scanning apparatus which is integrated into a system for producing and transmitting images. The originals of A4 format are normally positioned on a fixed exposure surface and the originals of A3 format are introduced into a separate device for transporting documents, which is adjacent to the fixed exposure surface. A carriage with lamps is slidable below the exposure surface to illuminate the A4 original while to illuminate the A3 original the carriage is positioned into a fixed position corresponding to the separate reading device where the original A3 is slid with respect to the carriage past an exposure zone. The reflected images of the originals are passed by means of mirrors mounted on the carriage to a lens which reflects them on to a photodetector device which converts the light rays into digital electrical signals. To adjust the focal lengths of the lens to the various dimensions of the A3 and A4 formats and to compensate for the different distances (difference D) of the two types of originals from the lens, two of the mirrors are mounted on an auxiliary frame which is movable on the carriage. The auxiliary frame is displaced by its own motor and a lead-screw to different positions in relation to the type of original which is to be read.
REFERENCES:
patent: 4429333 (1984-01-01), Davis et al.
Cedone Roberto
Coli Giuseppe
Meazza Giampiero
Coles Sr. Edward L.
Ing. C. Olivetti & C. S.p.A.
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