Palm top image scanner back lighting device

Abstract

A back lighting device for use with a palm top image scanner includes a body inside which a light generating member is arranged to project light through a window on which a film to be scanned is placed so as to project the image on the film to the image scanner. The window has a frosted surface to support the film thereon so as to eliminate the interference ring occurring therebetween. The window is provided with a circumferential step so as to define a recessed window area for receiving therein a film holding plate, made of a light transmitting material, for firmly holding the film on the window. The film holding plate may also be provided with a frosted surface to avoid the occurrence of the interference ring between the film holding plate and the window. An extension member is provided to connect to the body in an end to end manner so as to provide a greater space for the movement of the image scanner which allows the image scanner to move through the whole area of the film and thus no portion of the image will be lost during scanning. The extension member is also designed to serve as a cover member which releasably engages the back lighting device in such a manner as to shield and protect the window of the back lighting device from being damaged.

Dependencies are inferred from the claim text.