Infrared large format telecentric laser marking fθ lens

Abstract

An infrared large-format telecentric laser marking Fθ lens, comprising a first lens (110), a second lens (120), a third lens (130) and a fourth lens (140) arranged in sequence along the transmission direction of incident light . The first lens (110) is a biconcave negative lens, including a first curved surface (111) and a second curved surface (112); the second lens (120) is a meniscus positive lens, including a third curved surface (121) and a fourth curved surface (122); the third lens (30) is a meniscus positive lens, including the fifth curved surface (131) and the sixth curved surface (132); the fourth lens (140) is a plane lens, which protects other lenses. The first lens to the third lens are arranged coaxially along the transmission direction of the incident light. The first curved surface to the sixth curved surface are sequentially arranged along the transmission direction of the incident light. Infrared large-format telecentric laser marking Fθ lens can be used as Fθ lens for infrared laser marking, which meets the needs of large-format laser marking telecentricity, and at the same time controls the volume of the lens within an acceptable and applicable range to achieve The overall miniaturization of the optical system.

Description

【Technical field】 [0001] The invention relates to the field of optical lenses, in particular to an infrared large-format telecentric laser marking Fθ lens. 【Background technique】 [0002] The so-called telecentric technology refers to that in the optical design, the position of the exit pupil is set at infinity to ensure that the chief ray of the optical system of the Fθ lens is parallel to the optical axis, that is, all the light beams focused on the focal point on the image plane All have the same aperture angle, and images of objects with basically constant dimensions can be obtained on the image plane. Since it is required that all exit pupil principal rays must be parallel, when the image size is larger, the lens is also required to have a larger light diameter, that is, the larger the format, the larger the lens. The lens volume is proportional to the light diameter D or D3, so large-format Fθ lenses are rarely used in practice. [0003] For general telecentric syste...

AI Technical Summary

Problems solved by technology

[0003] For general telecentric systems, the position of the entrance pupil is set on the front focus of the system so that the chief ray of the focused beam is perpendicular to the focal plane. When the focal length of the lens is longer, the position of the entrance pupil will It will also be in a far place, which not only increases the overall volume of the optical system of the Fθ lens, but also increases the difficulty of aberration correction of the optical system of the Fθ lens

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