| 摘要 |
Disclosed is an optical fingerprint imaging system (50) for acquiring fingerprint images. The system comprises an optically transparent platen (54) having an exterior surface through which a fingerprint image is to be acquired; a protective film (58); and an adhesive (64) disposed on an inner surface of the protective film for removably attaching the protective film in optical alignment with the platen. The film comprises a urethane, the urethane being free from imperfections that would affect transmission of light and which is substantially chemically inert to petroleum-based substances with which it may come into contact. The inner surface of the film faces the platen, and the film is adapted to resiliently deform to ridges of a fingerprint from a finger pressed onto the film. The adhesive has having a selected cohesive strength such that the protective film may be removed without leaving an adhesive residue thereby allowing repeated replacement of the protective film.
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