Projection lens

US9529180B2 · kind B2 · utility

Assignee

• Zhejiang Sunny Optics Co., Ltd · CN

Inventors

• Lin Huang · 丈亭镇, CN
• Fujian Dai · Ningbo City, CN

Key dates

• Filing date: Jan 30, 2015
• Grant date: Dec 27, 2016
• Expiry date: Jan 30, 2035

Classification

• Technology area (CPC G): Physics
• CPC primary: G06F3/04883
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

Provided is a projection lens including a first lens, a reflective optical device, a second lens, a third lens and a fourth lens from an image side to an object side in turn. The first lens is of a negative focal power, an image side of the first lens is of a convexity, an object side of the first lens is of a concavity; the reflective optical device enables light to be bended; the second lens is of a positive focal power, an object side of the second lens is of a convexity; the third lens is of a positive focal power, an image side of the third lens is of a convexity, an object side of the third lens is of a concavity; and the fourth lens is of a positive focal power. A diaphragm is arranged between first lens and second lens, meeting 0.25<ImgH/D<0.55.