Image reading apparatus having light shielding element disposed

Details Image reading apparatus having light shielding element disposed Image reading apparatus having light shielding element disposed

1992-07-02

1993-10-19

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250 98, H01J 4014, H01L 3300

Patent

active

052548490

ABSTRACT:
This disclosure relates to an electroluminescent (EL) device serving as a light emitting device in an image reading apparatus. An electroluminescent device is of a thick film type and well suited for combination with a photosensing device in the form of an integral light emitting and sensing device. The electroluminescent device is provided with a pair of linear light emitting elements spaced apart from each other on a transparent electrode. Each of the light emitting element includes a luminescent layer interposed between a light shielding electrode and a transparent electrode. The luminescent layer is of resin containing fluorescent particles dispersed therein and is obtained by deposition by a thick film technique. The electroluminescent device is further provided with a light shielding element and an optically transmissive area, both of which are formed between the linear light emitting elements. At an interface between the linear light emitting element and the light shielding element, a portion of the light shielding electrode of the linear light emitting element overlies a portion of the light shielding element. The optically transmissive area between the linear light emitting elements is obtained without need for etching the luminescent layer.

REFERENCES:
patent: 4682042 (1987-07-01), Igarashi
patent: 4948966 (1990-08-01), Arques et al.
patent: 5015837 (1991-05-01), Hiroi et al.
patent: 5101099 (1992-03-01), Funada et al.
patent: 5115329 (1992-05-01), Ikarashi et al.
patent: 5124543 (1992-06-01), Kawashima
patent: 5160835 (1992-11-01), Yagya
patent: 5164580 (1992-11-01), Funada et al.

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