Light source for film scanner

Details Light source for film scanner Light source for film scanner

1997-08-25

2000-04-04

Lee, Thomas D.

Facsimile and static presentation processing

Facsimile

Picture signal generator

358487, 358509, 313114, H04N 104, H04N 146, H01J 516

Patent

active

060468262

ABSTRACT:
A light source for scanning a transparent film is equipped with a light intensity adjustment plate inserted between a light reflector and a light slot. The light intensity adjustment plate is partially painted to absorb light, so that the stronger light from the parallel center section of a linear light is weakened to produce a more uniform light along the whole scanning length.
The light intensity adjustment plate can be placed between the U-shaped light tube, or attached to the inner wall of the U-shaped light tube housing. The light intensity adjustment plate can have a frame which is rectangular or concave. The light intensity adjustment plate can also have an shaped extension toward the light tube to produce more uniform light.

REFERENCES:
patent: 3198982 (1965-08-01), Benson et al.
patent: 5272331 (1993-12-01), Bakker et al.
patent: 5844697 (1998-12-01), Omvik et al.

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