| 摘要 |
An information retrieval system for providing a retrievable updateable display of a permanent microfilm record comprises a gas panel display means capable of providing a composite visual display and microfilm record projection means capable of retrievably providing an image of a selected permanent microfilm record to the gas panel display means from a plurality of such permanent microfilm records. The composite visual display comprises a projection of the selected retrievable permanent microfilm record together with a substantially simultaneous gas panel display of retrievable updateable digital memory stored information which visually supplants predetermined portions of the selectably retrieved projected permanent microfilm record in the composite visual display. The system is controlled by a condition responsive process controller means. The visual supplanting of updated portions of the projected permanent microfilm record in the composite display may be accomplished by overwriting the aforementioned predetermined portions or by visually obscuring these predetermined portions and providing a visual pointer directed display of the corresponding updated stored information from the visually obscured portions. Such a system allows a large data bank to be kept up to date efficiently by keeping the source data base on a permanent microfilm record, keeping the revisions to the microfilm images in digital memory and generating an updated microfilm-plasma tube composite image whenever a revised record is requested.
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