Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1979-08-20
1980-11-25
Martin, John C.
Facsimile and static presentation processing
Facsimile
Recording apparatus
H04N 336
Patent
active
042361834
ABSTRACT:
Optical configurations for a rotating polygon film scanner for scanning film such as motion picture film or slide transparencies to produce a television signal are disclosed. The film scanner includes a solid-state line sensing array for scanning the image of a film frame in a direction generally perpendicular to the length of the film, and a rotating multifacet mirror such as a reflecting polygon for displacing the image relative to the line sensing array in a direction generally parallel with the length of the film. The optical configurations include the polygon mirror, a film gate, and a scan lens for forming an image of the film in the gate on the solid-state line sensing array. The scan lens is located between the line sensing array and the polygon mirror to provide on-axis scanning in the direction parallel with the length of the film. The film gate is configured to constrain the film to a surface such that the portion of the image impinging on the line sensing array is always in focus as the image is displaced by the polygon mirror. The shape of this surface is controlled by the relationship between the distance from the center of the film gate to the polygon mirror and the radius of a circle inscribed within the polygon mirror. In one configuration, the surface is a portion of a cylinder; in another, the surface is substantially flat. To reduce distortion of the image scanned across the line sensor, the optical axis of the scan lens, the axis of rotation of the polygon and the center of the film gate lie in a common plane.
REFERENCES:
patent: 4148071 (1979-04-01), Zinchuk
Wright et al., "Solid State Sensors: The Use of a Single Dimension 512 Element Array for Film Scanning," BBC Research Dept. Report No. 1973/32.
Bergmann et al., "Focus Path of a Laser Beam Deflected by a Prismatic Polygon Mirror: Its Calculation and Optimization", Applied Optics, vol. 15, No. 12, Dec. 1976, pp. 3084-3088.
Close Thomas H.
Eastman Kodak Company
Martin John C.
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