G - Physics – 03 – B
Patent
G - Physics
03
B
95/66
G03B 17/24 (2006.01) G03B 27/47 (2006.01)
Patent
CA 1160093
ABSTRACT A reflection sensing apparatus detects the prior exposure history of individual frames of an annotatable archival microfiche film card (20). A light source used to expose the microfiche to the record image is positioned to convert a reserved sensing area (296, qrst), which is outside the record image but within the frame, from an opaque and reflecting area to an irreversibly clear and transparent area upon exposure. The reserved area (236, qrst) of the microfiche film card frame is interrogated by automatic photoreflection sensing immediately prior to exposure of a given frame to disclose its prior exposure history. Suitable warning systems indicate the imminence of multiple exposure, and an automatic disabling feature pre- vents accidental re-exposure. A manual override means controlled by the operator must be actuated to allow re-exposure of a previously exposed frame. An alternative pre-exposure sensing of the re- served area by optical transmission methods is described. The apparatus also serves to detect failure of the light source on initial exposure of a chosen frame by a second photoreflection sensing after exposure, or alternatively by transmission sensing during exposure.
392267
Energy Conversion Devices Inc.
Macrae & Co.
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