| 摘要 |
Film contact scanners are provided which irradiate a first surface of a film with a light source, and receive an image of the film from a second side of the film at an array of photosensors. In a first embodiment, the array of photosensors is disposed adjacent the film so that each photosensor receives light from a separate point on the film. In a second embodiment, a bundle of optical fibers is disposed between the film and the array of photosensors. A gap is provided between the film and a first end of the bundle of optical fibers. Each photosensor receives the light from one or more of optical fibers for producing a predetermined MTF. In the second embodiment, a portion of the film between the light source and the bundle of optical fibers is formed in a cylindrical shape. A linear direction of the cylindrical shape is oriented to permit the photosensors to scan the film in a first direction. The film is moved past the bundle of optical fibers in the direction of the curve of the film for scanning the film in a second orthogonal direction. The light source includes either a diffuse illuminator or a specular illuminator. Alternatively, the film is sandwiched between a plate of transparent material, disposed adjacent a first side of the film closest to the source of light, and an area fiber optic for maintaining the film in a substantially flat orientation.
|
