Optical system and zoom lens

Abstract

The invention relates to an optical system (1) and a zoom lens, and the optical system comprises a first fixed group (G1) with positive focal power, a zoom group (G2) with negative focal power, a diaphragm (STOP), a second fixed group (G3) with positive focal power, and a focusing group (G4) with positive focal power, which are sequentially arranged from an object side to an image side along an optical axis. The zoom group (G2) and the focusing group (G4) can move along an optical axis, the first fixed group (G1) comprises three lenses, the zoom group (G2) comprises four lenses, the second fixed group (G3) comprises six or seven lenses, and the focusing group (G4) comprises four or three lenses. According to the invention, visible light and infrared light can be confocal, virtual focus is avoided at high and low temperatures, the image quality is high, and the tolerance sensitivity is low.

Description

technical field

[0001] The invention relates to the technical field of optical imaging, in particular to an optical system and a zoom lens. Background technique

[0002] With the development of social economy, the highway network is becoming more and more dense and the traffic is getting more and more busy. In order to maintain traffic safety, prevent traffic jams and achieve orderly under busy road conditions, the development of intelligent traffic security systems has practical significance for improving the management level of roads. The video camera system is an important part of the intelligent traffic security system, but the video camera lens series in the prior art are difficult to meet the confocal requirements of visible light and infrared light, no false focus at high and low temperatures, high image quality and low tolerance sensitivity Characteristics. Contents of the invention

[0003] The object of the present invention is to solve the above problems and pr...

Images