Image reading system using an LED array

Details Image reading system using an LED array Image reading system using an LED array

1988-01-14

1989-02-21

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

358293, 355 68, H01J 4014

Patent

active

048067750

ABSTRACT:
An image reading system for optically reading an original includes a convergent type light-emitting diode array as a light source, a white level reference and an image sensor disposed opposite to the white level reference. The light emitted from the LED array has a light intensity distribution which reduces in level in a transverse direction from an irradiation axis. The LED array is preferably so disposed with its irradiation axis passing a mid-point between the white level reference and an intersection point between an original surface travelling line and a straight line extending between the white level reference and the image sensor.

REFERENCES:
patent: 4433908 (1984-02-01), Omi et al.
patent: 4636063 (1987-01-01), Takai et al.
patent: 4680644 (1987-07-01), Shirato et al.
patent: 4699502 (1987-10-01), Araki et al.

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