Optical system for telescope
AssigneeAsia Optical Co., Inc.
InventorHui-Qing Chen
Life of this patent
Estimating the term…
Abstract
An optical system (1) of telescope includes an objective lens (10) for collecting incident light and transmitting the incident light along a light path, and an imaging lens group (20) disposed on the light path that makes the optical system focus on an image plane (40). The imaging lens group includes two positive lenses and two negative lenses. Each lens of the imaging lens group has a refractive index less than 1.80.
Claims19
An optical system of telescope comprising an objective lens and an imaging lens group defining an optical axis with the objective lens, the imaging lens group adjusting the focus of the optical system and comprising a first lens, a second lens, a third lens, and a fourth lens, two of the lenses being positive lenses and the other two being negative lenses, the refractive indices of the positive and negative lenses being all less than 1.80.
An optical system of telescope comprising:
- an objective lens collecting incident light and transmitting the incident light along a light path;
- and
- first, second, third, and fourth lenses disposed on the light path in order, and cooperatively making the optical system focus on an image plane;
- wherein the first lens is a thin positive lens, the second lens is a thin negative lens, the third lens is a thick positive lens, and the fourth lens is a thin negative lens.
Dependencies are inferred from the claim text.