| 摘要 |
Process and apparatus for duplicating on microfiche the intelligence appearing on a photoplastic microfiche master by irradiating the duplicate through the master with high intensity moderately collimated light. Photoplastic film having a relatively thick thermoplastic layer is used as the master. The master and the duplicate are separated by a gap of predetermined size, which gap can be filled by air, plastic, glass or any other transparent medium. Multiple light sources isolated from one another, are used and provision is made for absorbing and dissipating some of the heat before the light reaches the master. Means are provided for assuring relatively uniform light intensity across the entire recording face and for assuring consistent irradiation of the duplicate irrespective of lamp age or line voltage variations.
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