Wide-angle oversized aperture high-definition fixed focal lens

Abstract

The present invention relates to the lens technology field, especially to a wide-angle oversized aperture high-definition fixed focal lens. The lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens. The relations of each focal length are as follows: 1.5<|f3 / f|<5; 1.6<|f4 / f|<5.2; 0.9<|f5 / f|<3; 1.9<|f6 / f|<5.9; 1.5<|f2 / f|<6.5; 2.2<|f7 / f|<8.3; 4.3<|f8 / f|<13.2; 2.3<|f9 / f|<8.7. The wide-angle oversized aperture high-definition fixed focal lens can reach the large aperture of F0.95, the image surface with maximum value of 1 / 2.5', the field angle of more than 120 degrees, the resolution of six million pixels and the optical total length of less than 32mm; and moreover, the size is small and the production cost is low.

Description

technical field [0001] The invention relates to the field of lens technology, in particular to a wide-angle super-large aperture high-definition fixed-focus lens. Background technique [0002] Starlight cameras have full-color day and night capabilities, and can present color images even in low-brightness nights, while traditional surveillance cameras do not have such capabilities. They operate in infrared mode in low-light environments, and color information is lost. Therefore, the picture is black and white, and at the same time, the life of the camera will be greatly shortened due to the large amount of heat generated by the infrared lamp. Therefore, the concept of star-level cameras has increasingly become the development trend of the security industry. [0003] Starlight cameras need to be equipped with large aperture lenses to achieve full-color day and night effects. Generally speaking, lenses with larger apertures perform better in low-light environments. However, l...

AI Technical Summary

Problems solved by technology

[0003] Starlight cameras need to be equipped with large aperture lenses to achieve full-color day and night effects. Generally speaking, lenses with larger apertures perform better in low-light environments. However, large apertures have aberrations that are difficult to correct. Therefore, large The resolution of aperture lenses is usually not very high, especially the correction of off-axis aberrations for large aperture wide-angle lenses is a big challenge for optical design

[0004] At present, the wide-angle large-aperture lenses that are common on the market have a maximum aperture of only F1.4 and a resolution of no more than 3 megapixels, which is still insufficient for star-level cameras. Very few lenses with a maximum aperture of F1.2 are usually too small Huge, with a total optical length of more than 50mm. At the same time, the resolution does not exceed 2 million pixels. The overall image quality is poor and the practicability is not strong

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