Telephoto Lens Assembly
AssigneesSintai Optical (Shenzhen) Co., Ltd., Asia Optical Co., Inc.
InventorChing-Chung Yeh
Life of this patent
Estimating the term…
Abstract
A telephoto lens assembly comprises sequentially from an object side to an image side along an optical axis a first lens, a second lens, a stop, a third lens, a fourth lens, a fifth lens and a sixth lens. The first lens has negative refractive power and includes a convex surface facing the object side. The second lens has negative refractive power and includes a convex surface facing the image side. The third lens has positive refractive power. The fourth lens has refractive power. The fifth lens has refractive power. The sixth lens has positive refractive power. The fourth lens and the fifth lens are cemented.
Claims18
A telephoto lens assembly, comprising sequentially from an object side to an image side along an optical axis:
- a first lens which is a meniscus lens with negative refractive power;
- a second lens which is a meniscus lens with negative refractive power;
- a stop;
- a third lens with positive refractive power;
- a fourth lens with refractive power;
- a fifth lens with refractive power;
- and
- a sixth lens with positive refractive power;
- wherein the fourth lens and the fifth lens are cemented to form a cemented lens.
A telephoto lens assembly, comprising sequentially from an object side to an image side along an optical axis:
- a first lens which is a meniscus lens with negative refractive power;
- a second lens which is a meniscus lens with negative refractive power;
- a stop;
- a third lens with positive refractive power;
- a fourth lens with positive refractive power, which includes a concave surface facing the image side;
- a fifth lens with negative refractive power, which includes a convex surface facing the object side;
- and
- a sixth lens with positive refractive power.
Dependencies are inferred from the claim text.