Asia Optical Co., Ltd.

Sintai Optical (shenzhen) Co., Ltd.

Jian-Wei Lee

Shu-Hung Lin

Tao Fu

Chia-Hung Sun

Wei-Chen Zhan

A lens assembly includes a first, second, third, stop, fourth, fifth, sixth, and seventh in order from an object side to an image side along an optical axis. The first lens is a meniscus lens with refractive power and includes a convex surface facing the object side and a concave surface facing the image side. The second lens is with negative refractive power. The third lens is with positive refractive power and includes a convex surface facing the image side. The fourth lens is with refractive power and includes a convex surface facing the image side. The fifth lens is with positive refractive power and includes a convex surface facing the object side. The sixth lens is a biconcave lens with negative refractive power. The seventh lens is with refractive power and includes a convex surface facing the image side. The lens assembly satisfies: 4.3≤TTL/BFL≤5.3.

Lens assembly

A wide-angle lens assembly includes a first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, and tenth lenses. The first and second lenses are meniscus lenses with negative refractive power. The third and seventh lenses are with negative refractive power. The sixth and tenth lenses are with positive refractive power. The fourth lens is a meniscus lens with positive refractive power. The fifth lens includes a convex surface facing an object side. The eighth lens includes a convex surface facing the object side. The ninth lens includes a concave surface facing the object side and a convex surface facing an image side. The first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, and tenth lenses are arranged in order from the object side to the image side along an optical axis.

Wide-angle lens assembly

A wide-angle lens assembly includes a first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, and tenth lenses. The first and second lenses are meniscus lenses with negative refractive power. The third and ninth lenses are with negative refractive power. The fourth lens is with refractive power and includes a concave surface facing an object side. The fifth, sixth, and eighth lenses are with positive refractive power. The seventh lens is with refractive power and includes a concave surface facing the object side. The tenth lens is with refractive power and includes a concave surface facing an image side. The wide-angle lens assembly satisfies: 6&#x3c;f/f&#x3c;8.5; wherein fis an effective focal length in mm of the fifth lens and f is an effective focal length in mm of the wide-angle lens assembly.

A lens assembly includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens is with negative refractive power. The second lens is with negative refractive power. The third and fourth lenses are with positive refractive power. The fifth lens is with negative refractive power. The sixth lens is with positive refractive power. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are arranged in order from an object side to an image side along an optical axis. The lens assembly satisfies: 4.9&#x2264;TTL/f&#x2264;11.5; wherein TTL is an interval from an object side surface of the first lens to an image plane along the optical axis and f is an effective focal length of the lens assembly.

Lens assembly including six lenses of &#x2212;&#x2212;++&#x2212;+ refractive powers

A lens module of a scanner is provided, including a first lens with a positive diopter, a second lens with a negative diopter, a third lens with a positive diopter, and a fourth lens with a negative diopter. The first, second, third, and fourth lenses are sequentially arranged from an object end to an image end of the lens module, and at least one of the first and fourth lenses is an aspheric lens. The fourth lens has a focal length f4 and an objective side surface with a radius of curvature R7, wherein 0.1&#x3c;R7/f4&#x3c;1.

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Taichung, Taiwan

Jian-Wei Lee