E-Pin Optical Industry Co., Ltd.

Ming-Che Kuo

San-Woei Shyu

Bo-Yuan Shih

An miniature three-piece optical imaging lens with short back focal length, along an optical axis from the object side to the image side including: a first lens of positive refractive power that is a meniscus aspherical lens having a convex surface on the object side, an aperture stop, a second lens of negative refractive power that is a meniscus aspherical lens having a convex surface on the image side, a third lens of negative refractive power that is an aspherical lens whose center is on the optical axis, while on the lens center the convex surface is on the object side and the concave surface is on the image side. Moreover, from the center of the third lens element toward the edge, the refractive power changes from negative power, through an inflection point, to positive power. Furthermore, the optical imaging lens further satisfies conditions: wherein bf is back focal length, TL is total distance on the optical axis from the object side of the first lens to the image plane. Thereby, the imaging lens achieves effective aberration correction, high resolution and minimum total length.

Miniature three-piece optical imaging lens with short back focal length

An aspherical fiber coupling lens applied to a photoelectric coupling module is disclosed. The spherical fiber coupling lens is a bi-convex lens with positive refraction power and having a first optical surface and a second optical surface, both are aspherical surfaces while optical features of the lens satisfy the following conditions: wherein f is the effective focal length of the lens, dis thickness of the lens on optical axis, Nis refraction index of the lens, R, Rrespectively are curvature radiuses of the first optical surface and the second optical surface of the lens. Thereby the lens has features of small focus, compact volume and high coupling efficiency so that applications of the photoelectric coupling module are improved.

Growing community of inventors

Taipei, Taiwan

Ming-Che Kuo