Patent ID: 7995291

Claim:
An image reading lens system consisting of: six lenses including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens that are arranged in order from an object side; and a stop, wherein the six lenses include a negative lens that is made of a resin and has at least one aspheric surface, and a positive lens that is made of a resin and has at least one aspheric surface, the six lenses include a cemented lens that is adjacent to the stop and is formed by cementing a positive lens and a negative lens that are adjacent to each other, and the first lens has a negative refractive power, wherein the stop is disposed between the third lens and the fourth lens, the third lens has a negative refractive power, the second lens, the fourth lens, and the fifth lens have positive refractive powers, respectively, and the cemented lens is formed of the second lens and the third lens.