Image reading apparatus

Details Image reading apparatus Image reading apparatus

1992-08-05

1994-09-27

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

358483, H01J 4014

Patent

active

053509145

ABSTRACT:
An image reading apparatus includes a protective plate for securing photoelectric elements from wear and secondary incidence of rays of light. The amount of light of secondary incidence upon the photoelectric elements is governed by the total thickness of the protective plate and an adhesive layer, so that the amount of light of secondary incidence can be reduced to a desired level or less by setting the total thickness of the two layers to at least a certain value, derived from a function of the desired ratio of the amount of secondarily incident light upon the photoelectric elements to the total amount of light totally reflected at the boundary of the protective layer with the outside air.

REFERENCES:
patent: 5063286 (1991-11-01), Kaneko
patent: 5164580 (1992-11-01), Funada et al.
patent: 5239172 (1993-08-01), Yokota et al.

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