Wide-angle large-light-ring prime lens

Abstract

The invention relates to a wide-angle large-light-ring prime lens. A lens group is arranged in the prime lens, and the lens group comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with negative focal power, a fifth lens with positive focal power, a sixth lens with positive focal power, a seventh lens with positive focal power, an eighth lens with negative focal power and a ninth lens with positive focal power sequentially arranged from an object side to an image side along the direction of an opticalaxis. According to the wide-angle large-light-ring prime lens, the defect that an existing wide-angle large-light-ring prime lens matched with a 1/1.8'' image surface chip is large in size (large intotal optical length) is overcome, nine lenses with optimal optical conditions are matched, the total optical length is small, and day and night confocal and high and low temperature drift compensation functions are achieve.

Description

technical field [0001] The invention relates to a wide-angle and large aperture fixed-focus lens, which is especially used in the field of security and high-definition monitoring. Background technique [0002] At present, most of the security monitoring fixed-focus lenses on the market are 2-megapixel or 3-megapixel products, and their aperture value is generally greater than F2.0, matching the imaging chip of 1 / 2.7” image surface. Although it can meet the monitoring requirements of general occasions demand, but it is difficult for low-light and ultra-high-definition usage scenarios. In recent years, high-resolution imaging chips with 1 / 1.8” image planes have gradually become popular, and their prices have gradually been accepted by the market. Wide-angle and large-aperture CS-mount products or M12-mount lenses of chip-like chips, but the total optical length of such lenses is generally more than 30mm. Therefore, it has become an urgent task to provide a wide-angle and larg...

AI Technical Summary

Problems solved by technology

Although it can meet the monitoring needs of general occasions, it is difficult to meet the requirements of low-light and ultra-high-definition scenes.

In recent years, high-resolution imaging chips with a 1 / 1.8” image surface have gradually become popular, and their prices have gradually been accepted by the market. Although there are wide-angle and large aperture CS-mount products or M12-mount lenses that match this type of chip on the market, such chips The total optical length of the lens is generally more than 30mm, and it is still difficult to find a wide-angle, large aperture, high-definition lens that matches this type of chip and has a small optical total length

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