| 摘要 |
A fibre-optic imaging block for producing a high contrast, visible image of an object. A common light entry/exit face of the block is illuminated with light which is totally internally reflected interior of the individual block fibres toward an opposing partially cylindrical angular objective surface. When the object is placed on the objective surface of the block, a high contrast visible image is produced over the entire imaging angle defined by the sector angle of the objective surface. A complementary correction slug eliminates compound distortions introduced by the objective surface configuration. In an alternate embodiment of the imaging block, field distortions are eliminated by forming the individual fibre ends tangent to the objective surface, and a special correction slug is provided for optionally eliminating inclined plane and line curvature distortions. A finger printing system employs the imaging block in combination with a flash lamp and means for viewing the finger print image before recording on film.
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