A 10x imaging lens

Abstract

The utility model discloses a 10X imaging lens, its characterized in that: the lens includes gradually from object side to phase side along the optical axis: the front group lens with positive focal power, the middle group lens of balance phase difference and the rear group lens of increase light height. The lens has 8 optical pieces in common, including a double cemented lens. In preferred embodiment, the front group adopts positive lens, is used for fast focusing divergent light beam, the middle group adopts positive and negative lens combination, to balance aberration and adjust light angle, the rear group adopts the structure that negative lens is in front and positive lens is behind, to increase light height, makes light beam reach proper height in limited space, and guarantee main ray angle in proper range simultaneously.

Description

Technical fields:

[0001] This utility model relates to the field of optical lens technology, and in particular to a 10X imaging lens. Background technology:

[0002] With the rapid development of machine vision, biomedicine, and precision testing, the market demands high-magnification, miniaturized imaging lenses. Common solutions on the market typically employ a configuration of a microscope objective with an imaging adapter. This structure is complex due to the need to accommodate multiple functions; the large number of components results in a bulky overall size, making it unsuitable for small and lightweight applications. To address these problems in existing technologies, this invention provides a compact and high-performance 10X imaging lens by adjusting the lens group structure and rationally allocating optical power. Utility Model Content:

[0003] The purpose of this invention is to provide a 10X imaging lens.

[0004] To achieve the above objectives, this utility model provides the following solution:

[0005] A 10X imaging lens comprises eight optical components, including a cemented doublet lens. Its distinguishing feature is that, along the optical axis from the object plane to the image plane, the components are arranged sequentially as follows: a protective window, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, wherein the second lens is a cemented doublet lens, and the total optical length of the lens is 40-45 mm. The first and second lenses form the front lens group; the third, fourth, and fifth lenses form the middle lens group; and the sixth and seventh lenses form the rear lens group.

[0006] The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are all spherical lenses made of glass.

[0007] Preferably, the first lens is a positive lens with an absolute focal length of 6mm-8mm;

[0008] Preferably, the second lens is a cemented lens with an absolute focal length of 18mm-20mm;

[0009] Preferably, the third lens is a positive lens with an absolute focal length of 4mm-6mm;

[0010] Preferably, the fourth lens is a negative lens with an absolute focal length of 2mm-4mm;

[0011] Preferably, the fifth lens is a positive lens with an absolute focal length of 4mm-6mm;

[0012] Preferably, the sixth lens is a negative lens with an absolute focal length of 2mm-4mm;

[0013] Preferably, the seventh lens is a positive lens with an absolute focal length of 24mm-26mm.

[0014] The front lens group has a positive total optical power. By using separate lenses to reduce the curvature of the lenses, the aberrations caused by the large aperture angle are reduced. At the same time, one of the lenses is a cemented lens to reduce chromatic aberration.

[0015] The middle lens group consists of three separate lenses to balance the aberrations of the front and rear lens groups.

[0016] The rear lens group consists of a sixth lens and a seventh lens. The sixth lens is a negative lens, which increases the angle of small-angle light rays, thereby rapidly increasing the height of the light rays. This achieves the effect of reducing the total length and achieving the target magnification in a limited space. The seventh lens is a positive lens, which converges the light rays and reduces the angle of the light rays.

[0017] In summary, this utility model discloses a 10X imaging lens. The 10X imaging lens is configured along the optical axis from the object plane to the image plane as follows: a protective window, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The second lens is a cemented doublet lens, and the total optical length of the lens is 40-45mm. The first and second lenses form the front lens group; the third, fourth, and fifth lenses form the middle lens group; and the sixth and seventh lenses form the rear lens group. It features small size and good image quality. Attached image description:

[0018] Figure 1 The image shown is a schematic diagram of a 10X imaging lens.

[0019] In this designation, 1 is the first lens, 2 is the second lens, 3 is the third lens, 4 is the fourth lens, 5 is the fifth lens, 6 is the sixth lens, and 7 is the seventh lens.

[0020] Figure 2 The MTF of the 10X imaging lens is shown: all fields of view are close to the diffraction limit, and the center field contrast is >0.2@60lp / mm. Detailed implementation method:

[0021] The specific parameters in this embodiment are as follows (R1 refers to the surface radius of curvature along the object plane direction of the optical path, R2 refers to the surface radius of curvature along the image plane direction of the optical path, and D refers to the center thickness. Unit: mm).

[0022]

[0023] Material 1: H-FK95N, D = 2.094; Material 2: H-ZLAF71, D = 0.5

[0024]

[0025]

Claims

1. A 10X imaging lens, comprising eight optical components, including a cemented doublet lens, characterized in that: Along the optical axis from the object plane to the image plane, the lens is arranged in sequence as a protective window, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, wherein the second lens is a cemented doublet lens. The total optical length of the lens is 40-45mm. The first lens and the second lens form the front lens group; the third lens, the fourth lens, and the fifth lens form the middle lens group; and the sixth lens and the seventh lens form the rear lens group.

2. A 10X imaging lens according to claim 1, wherein the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, and seventh lens are all spherical lenses made of glass, characterized in that: The first lens is a positive lens with an absolute focal length of 6mm-8mm; The second lens is a cemented lens with an absolute focal length of 18mm-20mm; The third lens is a positive lens with an absolute focal length of 4mm-6mm. The fourth lens is a negative lens with an absolute focal length of 2mm-4mm. The fifth lens is a positive lens with an absolute focal length of 4mm-6mm. The sixth lens is a negative lens with an absolute focal length of 2mm-4mm. The seventh lens is a positive lens with an absolute focal length of 24mm-26mm.

3. A 10X imaging lens according to claim 1, characterized in that: The front lens group, consisting of the first and second lenses, has a positive total optical power, and the second lens is a cemented lens. The rear lens group consists of the sixth and seventh lenses, with the sixth lens being a negative lens and the seventh lens being a positive lens.

Images