Optical system for telescope

Abstract

The invention discloses an optical system for a telescope. The optical system is an axisymmetric circular lens. According to the sequence of a light path, the front surface and the rear surface of the lens respectively comprise a circular aperture concentric with an optical axis and located in the centre of the lens and an annular aperture surrounding the circular aperture; and the surface shapes of the circular aperture and the annular aperture are axisymmetric aspheric surfaces or spherical surfaces. For the front surface of the lens, the central circular aperture of the front surface of the lens is a concave surface plated with an internal reflection film, and the annular aperture of the front surface of the lens is a convex surface plated with a reducing reflection film; and for the rear surface of the lens, the central circular aperture of the rear surface of the lens is a convex surface plated with a reducing reflection film, and the annular aperture of the rear surface of the lens is a concave surface plated with an internal reflection film. According to the invention, the telescope system on a single lens is realized, the number of the lens is reduced, material cost and processing cost are reduced, and the advantages of refracting telescopes and reflecting telescopes are reserved. With strong aberration correction ability, short light path, wide field, good image quality and convenience for carrying, the optical system is suitable for preparing glasses telescopes.

Description

technical field [0001] The invention relates to an optical element, in particular to a telescope optical system. Background technique [0002] A telescope is an optical instrument for observing distant objects. The telescope optical system consists of an objective lens and an eyepiece. The image focus of the objective lens coincides with that of the eyepiece. The magnification of the telescope is equal to the ratio of the focal length of the objective lens to the focal length of the eyepiece. The main types of telescopes are Galilean and Kepler. The objective lens of the Galileo type telescope is positive focal length, and the eyepiece is negative focal length. It has the advantages of simple structure, short tube length, and positive image of the object, but the magnification cannot be too large, generally no more than 6 to 8 times, and can be used as an ordinary observation telescope. The Kepler telescope has an objective lens and an eyepiece with a positive focal length...

AI Technical Summary

Problems solved by technology

Although the telescopic objective lens system involved in this patent is compact in structure and small in size, the objective lens and eyepiece of the system are both single-piece convex lenses, so it is difficult to guarantee the imaging quality, and it is impossible to increase the aperture and field of view. It belongs to the traditional refractive telescope. Tele-objective system

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