Apparatus for duplicating X-ray type photographic films

US5619306A · kind A · utility

Inventors

• Duane W. Baxter · Rochester, US
• Donald J. Wanek · Rochester, US
• Arthur Hamburgen · Rochester, US

Key dates

• Filing date: Dec 19, 1994
• Grant date: Apr 8, 1997
• Expiry date: Dec 19, 2014

Classification

• Technology area (CPC G): Physics
• CPC primary: G03B27/10
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

Photographic films, such as X-rays, are duplicated by exposing an unexposed copy film in the presence of an intimately overlying developed film to be copied. The device exposure station has a pair of rollers at the entrance to drive the film pair and to remove from the interface between the films trapped air that would compromise the accuracy of resolution and contrast of the copy. Another pair of rollers at the outlet from the exposure station cooperates with the roller pair at the exposure station inlet to maintain the film pair within the exposure station in a planar orientation to avoid curvature which is another principal source of compromised resolution in film copies. The source of illumination for copy film exposure is, preferably, a fluorescent tube that generates emissions that are approximately matched to the wave length response of the unexposed copy film and has a length such that each end is disposed beyond the portion of the exposure station confronting a film pair so that only the tube portion intermediate the heating elements at the tube ends, where emission is most uniform, confronts the film being exposed. The film pair is driven through the apparatus by a steppe…