Patent ID: 9329395
Filing Date: 2016-05-03
CPC Classification: G02B

Claim Text:
1. A green laser zoom beam expanding system, comprising: a first lens, a second lens, and a third lens, which are coaxially arranged along a transmission direction of an incident light sequentially; the first lens and the third lens being plane-convex positive lenses, and the second lens being a meniscus negative lens; wherein the first lens comprises a first surface and a second surface; the second lens comprises a third surface and a fourth surface; the third lens comprises a fifth surface and the sixth surface; the first to sixth surfaces are arranged sequentially along the transmission direction of the incident light; radiuses of curvature of the first to sixth surfaces are ∞, −29.8 mm, 7.2 mm, 1.6 mm, ∞, −100 mm, respectively; center thicknesses of the first to third lenses are 2 mm, 1 mm, 4 mm, respectively; outer diameters of the first to third lenses are 10 mm, 3 mm, 34 mm; respectively; ratios of refractive index to Abbe number of the first to third lenses are 1.8:25, 1.48:68, 1.8:25, respectively; a distance on an optical axis between the second surface and the third surface ranges from 8 to 28 mm; a distance on the optical axis between the fourth surface and the fifth surface ranges from 107 to 115 mm; tolerances of the radius of curvature, the center thickness, the outer diameter, the ratio of the refractive index to Abbe number, and the distance are 5%.