Wide-angle lens and panoramic imaging system including seven lenses of -++-++ refractive powers and a reflective element

US11199686B2 · kind B2 · utility

Assignee

• JIANGXI LIANCHUANG ELECTRONIC CO., LTD · CN

Inventors

• Weina Li · South Glastonbury, US
• Bo Gao · Lo Wu, CN
• Jian Han · Huntsville, US
• Jiyong Zeng · Nanchang, CN

Key dates

• Filing date: Nov 14, 2018
• Grant date: Dec 14, 2021
• Expiry date: Jun 18, 2040

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B13/0065
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A wide-angle lens in the following order from an object side toward an image plane includes: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an optical reflecting member, and an optical filter. The first lens has negative refractive power and a concave image side surface. The second lens has negative refractive power and a concave image side surface. The third lens has positive refractive power. The fourth lens has positive refractive power and a concave image side surface. The fifth lens has negative refractive power, a concave object side surface, and a concave image side surface. The sixth lens has positive refractive power, a convex object side surface, and a convex image side surface. The seventh lens has positive refractive power, a convex object side surface, and a convex image side surface. Each of the first lens and the third lens is a spherical lens. One of the second lens and the fourth lens is an aspherical lens, and the other one of the second lens and the fourth lens is a spherical lens. Each of the fifth lens and the sixth lens is spherical lens. The fifth lens and the sixth lens form a cemented lens. The seventh …