Erecting equal-magnification lens array plate, optical scanning unit, and image reading device

An erecting equal-magnification lens array plate comprising:

• a first lens array plate provided with a plurality of first lenses systematically arranged on a first surface and a plurality of second lenses systematically arranged on a second surface opposite to the first surface;
• and
• a second lens array plate provided with a plurality of third lenses systematically arranged on a third surface and a plurality of fourth lenses systematically arranged on a fourth surface opposite to the third surface;
• wherein the first lens array plate and the second lens array plate form a stack such that the second surface and the third surface face each other to ensure that a combination of the lenses aligned with each other form a coaxial lens system,
• the erecting equal-magnification lens array plate receives light from a linear light source facing the first surface and forms an erect equal-magnification image of the linear light source on an image plane facing the fourth surface, and
• an annular slope is formed around each second lens and/or each third lens,
• wherein the slope is formed to radially extend from the outer periphery of each second lens and/or each third lens in a tapered shape.