6mm fixed-focus machine vision lens

Abstract

The invention relates to the technical field of machine vision lenses, in particular to a 6mm fixed-focus machine vision lens. The 6mm fixed-focus machine vision lens comprises a mechanical system andan optical system mounted inside the mechanical system and is characterized in that the optical system sequentially comprises a first lens G1, a second lens G2, a third lens G3, a fourth lens G4, a fifth lens G5, a sixth lens G6, a seventh lens G7 and an eighth lens G8 from the object space to the image space, the focal length of the optical system is f, and f, the focal length f1 of the first lens and the focal length f2 of the second lens satisfy the following relations: 2<|f1 / f|<3, and 1.5<|f2 / f|<2.5; f, the focal length f3 of the third lens and the focal length f4 of the fourth lens satisfy the following relations: 4<|f3 / f|<5.5, and 2<|f4 / f|<3.5; the focal length of a first bonding lens B1 is fB1, and fB1 and f satisfy the following relation: 1.5<fB1 / f|<3. By the arrangement of the first lens G1, the second lens G2, the third lens G3, the fourth lens G4, the fifth lens G5, the sixth lens G6, the seventh lens G7 and the eighth lens G8, and the range conditions of the focal lengthsof the lenses, the pixel value of the 6mm fixed-focus machine vision lens can reach 2.5 megapixels when the focal length is 6mm and the size of a corresponding chip is 1 / 2', high-end product requirements are satisfied, and the clear aperture of the 6mm fixed-focus machine vision lens can be adjusted flexibly.

Description

technical field [0001] The invention relates to the technical field of machine vision lenses, in particular to a 6mm fixed-focus machine vision lens. Background technique [0002] Machine vision is a system that uses machines instead of human eyes for measurement and judgment. Mainly through the visual device (ie industrial camera and optical lens), the ingested target is converted into an image signal and sent to the signal processing system. The signal processing system converts the pixel distribution, brightness, color and other information in the image into a digital signal; then the image The processing software performs various operations on these digital signals to extract the characteristics of the target, and then makes measurement and judgment on the ingested target according to the characteristics. [0003] In recent years, with the rapid development of the microelectronics industry, machine vision systems with high resolution and high processing speed have been ...

AI Technical Summary

Problems solved by technology

For the domestic machine vision lens with a focal length of 6mm, when the size of the supporting camera chip is 1 / 2", the number of pixels cannot reach 2.5 million, which cannot meet the needs of high-end products.

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