| 摘要 |
A viewing device with a series of image bearing films that are individually positioned to form a composite image. Each film is wound from one roller, past the composite image forming area and onto a take-up roller. In one embodiment a single knob for the entire device operates a drive-chain which is capable of separately engaging the pair of rollers for each film. In another embodiment a control knob and a one-way mechanism is provided for each roller pair to permit the film to be wound precisely back and forth without any binding of the film. The device can be used for facial identification.
|
