Image reading apparatus with corrected optical length

Details Image reading apparatus with corrected optical length Image reading apparatus with corrected optical length

1991-05-13

1992-09-29

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

355 45, H01J 314

Patent

active

051515938

ABSTRACT:
An image reading apparatus includes an illumination unit for illuminating an image, a projection unit for projecting the image illuminated by the illumination unit onto a predetermined surface, a reflection unit arranged between the projection unit and the predetermined surface, and a reading unit for reading image information of the image projected by the projection unit through the reflection unit. An optical path length between the reading unit and the reflection unit is equal to an optical path length between the reflection unit and the predetermined surface.

REFERENCES:
patent: 4619519 (1986-10-01), Takahashi et al.
patent: 4894681 (1990-01-01), Watanabe et al.

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