Claims
- 1. A method for lifting the image of passing documents including: providing source means of stable-wavelength-output illumination, providing CCPD camera means selected to exhibit a prescribed spectral response plus associated filter means, disposed upstream of the camera means and adapted to shift its received image-light spectrum to be closer to that which is optimal for the camera means;
- providing a pair of imaging-sites adapted to receive said illumination and project document-images to said camera means;
- providing heat-trap means to remove IR from said illumination;
- providing split-means to split each illumination beam and present it as two sub-beams disposed symmetrically about each said site via slit-means; and
- intercepting each said beam with focus means adapted to change the focal point thereof; and providing a fibre-optic array for each beam, while adapting each array to exhibit a relatively circular entry-aperture of prescribed diameter and an exit-face configured to illuminate its respective slit means and site, while arranging and adapting said focus means to vary the focal-point of its beam and so change beam-diameter at said entry-face sufficient to spread its beam well beyond the aperture and so controllably reduce the amount of the beam entering its array.
- 2. The arrangement of claim 1, wherein said illumination source means comprises fluorescent lamp means.
Parent Case Info
This is a Division, of U.S. Ser. No. 08/089,817, filed Jul. 12, 1993 now U.S. Pat. No. 5,513,274, which is a division of application Ser. No. 07/874,876 filed Apr. 28, 1992, now U.S. Pat. No. 5,259,043, which is in turn a Division of U.S. Ser. No. 07/419,355 filed Oct. 10, 1989, now U.S. Pat. No. 5,155,776.
US Referenced Citations (6)
Divisions (3)
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Number |
Date |
Country |
Parent |
89817 |
Jul 1993 |
|
Parent |
874876 |
Apr 1992 |
|
Parent |
419355 |
Oct 1989 |
|