Image-reading device

Details Image-reading device Image-reading device

1992-04-08

1993-11-02

Sugarman, Scott J.

Optical: systems and elements

Lens

With graded refractive index

359652, 359820, G02B 300, G02B 702

Patent

active

052588734

ABSTRACT:
An image-reading device comprises a lens unit array comprising an array of distributed refractive index plastic cylindrical lens elements and plastic plates, adhering the distributed refractive index plastic cylindrical lens elements therebetween, and a plastic case containing and holding the lens unit array. The difference in the thermal expansion coefficients of the plates of the lens unit array and the plastic case is 5.0.times.10.sup.-5 cm/cm/.degree. C. or below, or more preferably, 3.0.times.10.sup.-5 cm/cm/.degree. C. or below. The plastic case is formed by connecting, in a longitudinal arrangement, a plurality of case segments formed by an injection molding.

REFERENCES:
Patent Abstracts of Japan, vol. 13, No. 74 (E-717) Feb. 20, 1989, and JP-A-63 254 854, Oct. 21, 1988, Watanabe Hiroyuki, "Solid-State Image Pickup Device".
Patent Abstracts of Japan, vol. 16, No. 252 (P-1367), Jun. 9, 1992, and JP-A-40 58 201, Feb. 25, 1992, Takami Manabu, "Rod Type Micro Lens Array".
Database WPIL, an 86-121311, and JP-A-61 058 838, "Lens Array Production Without Polishing Process--Includes Heating Lens Material to be Fused and Dropped Through Holes Onto Base Plate for Solidifying".

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