阅读说明：本技术 一种大靶面半组移动工业微距镜头 (Large-target-surface half-group mobile industrial macro lens ) 是由 王杰 陈腾飞 余飞鸿 于 2019-11-15 设计创作，主要内容包括：本发明公开了一种大靶面半组移动工业微距镜头,沿光轴从物方到像方依次布置有可沿光轴前后移动的第一透镜组、固定的第二透镜组和保护玻璃,所述第一透镜组中布置有随第一透镜组移动的可变光澜；第一透镜组沿光轴前后移动,使第一透镜组与第二透镜组之间的间距可调,实现连续变倍；连续变倍过程中可变光阑跟随第一透镜组移动。本发明提供的大靶面半组移动工业微距镜头可根据不同的使用场景选择不同的物距与放大倍率,并且最大成像圆直径大于29mm,可以匹配1.75英寸图像传感器。(The invention discloses a large-target-surface half-group mobile industrial macro lens, which is characterized in that a first lens group, a fixed second lens group and protective glass which can move back and forth along an optical axis are sequentially arranged from an object side to an image side along the optical axis, and a variable optical wave which moves along with the first lens group is arranged in the first lens group; the first lens group moves back and forth along the optical axis, so that the distance between the first lens group and the second lens group is adjustable, and continuous zooming is realized; the variable diaphragm moves along with the first lens group in the continuous zooming process. The large-target-surface half-group mobile industrial macro lens provided by the invention can select different object distances and magnification ratios according to different use scenes, and the diameter of the maximum imaging circle is larger than 29mm, so that the large-target-surface half-group mobile industrial macro lens can be matched with a 1.75-inch image sensor.)

1. A large-target-surface half-group mobile industrial macro lens is characterized in that a first lens group capable of moving back and forth along an optical axis, a fixed second lens group and protective glass are sequentially arranged from an object side to an image side along the optical axis, and a variable optical wave moving along the first lens group is arranged in the first lens group; the first lens group moves back and forth along the optical axis, so that the distance between the first lens group and the second lens group is adjustable, and continuous zooming is realized; the variable diaphragm moves along with the first lens group in the continuous zooming process.

2. The large-target-surface half-group mobile industrial macro lens according to claim 1, wherein the focal lengths of the first lens group and the second lens group satisfy the following conditional expression:

0.1<|f1/f2|<0.5

0.5<|f1/f0|<1.5

2.0<|f2/f0|<5.0

where f1 represents the focal length of the first lens group, f2 represents the focal length of the second lens group, and f0 represents the focal length of the entire lens.

3. The large-target-surface half-group mobile industrial macro lens according to claim 1, wherein the focal lengths of the first lens group and the second lens group satisfy the following conditional expression:

0.25<|f1/f2|≤0.28

0.8<|f1/f0|<1.1

2.5<|f2/f0|<4.3

where f1 represents the focal length of the first lens group, f2 represents the focal length of the second lens group, and f0 represents the focal length of the entire lens.

4. The large target surface half-group mobile industrial macro lens according to any one of claims 1 to 3, wherein the first lens group comprises: a first lens having a convex object surface side and a flat image surface side, a second lens having a convex object surface side and a concave image surface side, a third lens having a convex object surface side and a concave image surface side, a fourth lens having a concave object surface side and a concave image surface side, a fifth lens having a convex object surface side and a convex image surface side, a sixth lens having a flat object surface side and a convex image surface side, and a seventh lens having a concave object surface side and a convex image surface side;

the concave surface of the fourth lens and the convex surface of the fifth lens are glued to form a first cemented lens, the fourth lens is close to one side of the object surface, the convex surface of the sixth lens and the concave surface of the seventh lens are glued to form a second cemented lens, and the sixth lens is close to one side of the object surface;

the second lens group comprises an eighth lens and a ninth lens, and the eighth lens is close to one side of the object plane;

the object plane side of the eighth lens is a concave surface, the image plane side is a convex surface, the object plane side of the ninth lens is a concave surface, the image plane side is a convex surface, and the convex surface of the eighth lens and the concave surface of the ninth lens are cemented to form a third cemented lens.

5. The large-target-surface half-group mobile industrial macro lens according to claim 4, wherein the iris diaphragm is arranged between the third lens and the fourth lens of the first lens group, and the aperture size of the variable diaphragm is adjustable.

6. The large-target-surface half-group mobile industrial macro lens according to claim 4, wherein the focal length value of the first lens is in the range of 40.0 to 80.0mm, the focal length value of the second lens is in the range of 40.0 to 60.0mm, the focal length value of the third lens is in the range of-30.0 to-20.0 mm, the focal length value of the fourth lens is in the range of-5.0 to-15.0 mm, the focal length value of the fifth lens is in the range of 10.0 to 20.0mm, the focal length value of the sixth lens is in the range of 15.0 to 25.0mm, the focal length value of the seventh lens is in the range of-40.0 to-20.0 mm, the focal length value of the eighth lens is in the range of 30.0 to 45.0mm, and the focal length value of the ninth lens is in the range of-55.0 to-45.0 mm.

7. The large-target-surface half-group mobile industrial macro lens according to claim 4, wherein the focal length value of the first lens is in the range of 48.5 to 74.4mm, the focal length value of the second lens is in the range of 46.3 to 58.7mm, the focal length value of the third lens is in the range of-25.3 to-24.4 mm, the focal length value of the fourth lens is in the range of-12.0 to-11.5 mm, the focal length value of the fifth lens is in the range of 14.0 to 14.2mm, the focal length value of the sixth lens is in the range of 19.4 to 20.5mm, the focal length value of the seventh lens is in the range of-31.5 to-31.2 mm, the focal length value of the eighth lens is in the range of 39.5 to 40.0mm, and the focal length value of the ninth lens is in the range of-50.3 to-49.3 mm.

8. The large-target-surface half-group mobile industrial macro lens according to claim 1, wherein a distance d1 between the image plane side of the first lens group and the object plane side of the second lens group satisfies the following formula 5.0mm < d1 < 60.0 mm.

9. The large-target-surface half-group mobile industrial macro lens according to any one of claims 1 to 8, wherein the working distance of the industrial macro lens is 80.0 to 250.0mm, and the magnification is 0.2x to 1.0 x.

10. The large target surface half set mobile industrial macro lens according to any one of claims 1 to 8, wherein the maximum imaging circle diameter of said industrial macro lens is larger than 29mm, matching 1.75 inch image sensor.

Technical Field

The invention belongs to the field of optical lenses, and particularly relates to a large-target-surface half-group mobile industrial macro lens.

Background

The macro lens is a special lens used for macro photography and is mainly used for shooting very fine objects. Chinese patent publication No. CN105093504A discloses a macro lens for attachment to the front end of a lens of an imaging device. The macro lens includes, in order from an object side to an image plane side, a first lens unit having a positive refractive power, a second lens unit having a positive refractive power, and a third lens unit having a negative refractive power. Chinese patent publication No. CN102053348A discloses a macro lens system including, in order from an object side to an image side, a first lens group having positive refractive power; a second lens group having negative refractive power; a third lens group having positive refractive power; a fourth lens group having positive refractive power; and a fifth lens group having a negative refractive power, wherein, during focusing, the first lens group, the third lens group, and the fifth lens group are fixed, and the second lens group and the fourth lens group are moved.

The industrial macro lens in the current market has two types of fixed magnification and variable magnification. The diameter of an image circle imaged by the industrial macro lens with fixed multiplying power is larger, the image circle can be matched with an image sensor with larger size, and the observation visual field range is larger; however, the magnification is fixed, so that the method cannot meet the requirements of various scenes. The variable-magnification industrial macro lens can adapt to different observation objects by adjusting the object distance and the magnification, but the diameter of an image circle imaged by the variable-magnification industrial macro lens on the market is smaller, so that the visual field of detection and observation is smaller.

Therefore, the development of an industrial macro lens with variable magnification and a larger imaging circle diameter is urgently needed.

Disclosure of Invention

The invention discloses a large-target-surface half-group mobile industrial macro lens, which can select different object distances and magnification ratios according to different use scenes, has a maximum imaging circle diameter larger than 29mm, and can be matched with a 1.75-inch image sensor.

The technical scheme adopted by the invention is as follows:

a large-target-surface half-group mobile industrial macro lens is characterized in that a first lens group capable of moving back and forth along an optical axis, a fixed second lens group and protective glass are sequentially arranged from an object side to an image side along the optical axis, and a variable optical wave moving along the first lens group is arranged in the first lens group; the first lens group moves back and forth along the optical axis, so that the distance between the first lens group and the second lens group is adjustable, and continuous zooming is realized; the variable diaphragm moves along with the first lens group in the continuous zooming process.

The focal lengths of the first lens group and the second lens group satisfy the following conditional expressions:

0.1<|f1/f2|<0.5

0.5<|f1/f0|<1.5

2.0<|f2/f0|<5.0

where f1 represents the focal length of the first lens group, f2 represents the focal length of the second lens group, and f0 represents the focal length of the entire lens.

Preferably, the focal lengths of the first lens group and the second lens group satisfy the following conditional expression:

0.25<|f1/f2|≤0.28

0.8<|f1/f0|<1.1

2.5<|f2/f0|<4.3

where f1 represents the focal length of the first lens group, f2 represents the focal length of the second lens group, and f0 represents the focal length of the entire lens.

Further, the first lens group includes: a first lens having a convex object surface side and a flat image surface side, a second lens having a convex object surface side and a concave image surface side, a third lens having a convex object surface side and a concave image surface side, a fourth lens having a concave object surface side and a concave image surface side, a fifth lens having a convex object surface side and a convex image surface side, a sixth lens having a flat object surface side and a convex image surface side, and a seventh lens having a concave object surface side and a convex image surface side;

the concave surface of the fourth lens and the convex surface of the fifth lens are glued to form a first cemented lens, the fourth lens is close to one side of the object surface, the convex surface of the sixth lens and the concave surface of the seventh lens are glued to form a second cemented lens, and the sixth lens is close to one side of the object surface;

the second lens group comprises an eighth lens and a ninth lens, and the eighth lens is close to one side of the object plane;

the object plane side of the eighth lens is a concave surface, the image plane side is a convex surface, the object plane side of the ninth lens is a concave surface, the image plane side is a convex surface, and the convex surface of the eighth lens and the concave surface of the ninth lens are cemented to form a third cemented lens.

The iris diaphragm is arranged between the third lens and the fourth lens of the first lens group, and the aperture size of the variable diaphragm is adjustable.

The protective glass is arranged behind the image side of the ninth lens.

Furthermore, the focal length value range of the first lens is 40.0-80.0 mm, the focal length value range of the second lens is 40.0-60.0 mm, the focal length value range of the third lens is-30.0-20.0 mm, the focal length value range of the fourth lens is-5.0-15.0 mm, the focal length value range of the fifth lens is 10.0-20.0 mm, the focal length value range of the sixth lens is 15.0-25.0 mm, the focal length value range of the seventh lens is-40.0-20.0 mm, the focal length value range of the eighth lens is 30.0-45.0 mm, and the focal length value range of the ninth lens is-55.0-45.0 mm.

More preferably, the focal length value range of the first lens is 48.5-74.4 mm, the focal length value range of the second lens is 46.3-58.7 mm, the focal length value range of the third lens is-25.3-24.4 mm, the focal length value range of the fourth lens is-12.0-11.5 mm, the focal length value range of the fifth lens is 14.0-14.2 mm, the focal length value range of the sixth lens is 19.4-20.5 mm, the focal length value range of the seventh lens is-31.5-31.2 mm, the focal length value range of the eighth lens is 39.5-40.0 mm, and the focal length value range of the ninth lens is-50.3-49.3 mm.

In the process of changing the magnification from the low magnification to the high magnification, the distance between the first lens group and the second lens group is reduced, and the distance d1 between the image plane side of the first lens group and the object plane side of the second lens group satisfies the following formula 5.0mm < d1 < 60.0 mm.

The working distance of the industrial macro lens is 80.0-250.0mm, and the magnification is 0.2x-1.0 x.

The maximum imaging circle diameter of the industrial macro lens is larger than 29mm and matched with a 1.75-inch image sensor.

Compared with the prior art, the invention has the following beneficial effects:

by adopting a half-group moving method and changing the distance between the first lens group and the second lens group, the zoom range of 0.2x-1.0x can be realized, the working distance covers 80.0-250.0mm, different object distances and magnification ratios can be selected according to different use scenes, the maximum image circle diameter is designed to be 29.0mm, and the image circle can be matched with a 1.75-inch image sensor for use. The imaging device is simple in structure, convenient to manufacture, low in production cost and excellent in imaging quality.

Drawings

FIG. 1 is a schematic diagram of an optical system of a large target surface half-set mobile industrial macro lens in embodiment 1;

FIG. 2 is a MTF curve of the large target surface half-group mobile industrial macro lens in example 1 at a magnification of 0.25 ×;

FIG. 3 is a MTF curve of the large target surface half-group mobile industrial macro lens in example 1 at a magnification of 0.5;

FIG. 4 is the MTF curve of the large target surface half-group mobile industrial macro lens in embodiment 1 at a magnification of 1X;

FIG. 5 is a schematic view of an optical system of a large target surface half-set mobile industrial macro lens in embodiment 2;

FIG. 6 is a MTF curve of the large target surface half-group mobile industrial macro lens in example 2 at a magnification of 0.25 ×;

FIG. 7 is a MTF curve of the large target surface half-group mobile industrial macro lens in example 2 at a magnification of 0.5;

FIG. 8 is the MTF curve of the large target surface half-group mobile industrial macro lens in embodiment 2 at a magnification of 1X;

FIG. 9 is a schematic diagram showing the structure of an optical system of a large target surface half-set mobile industrial macro lens according to embodiment 3;

FIG. 10 is a MTF curve of the large target surface half-group mobile industrial macro lens in example 3 at a magnification of 0.25 ×;

FIG. 11 is the MTF curve of the large target surface half-group mobile industrial macro lens in example 3 at a magnification of 0.5;

fig. 12 MTF graph of the large target surface half-group mobile industrial macro lens in embodiment 3 at magnification of 1 ×.

Detailed Description

In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.

As shown in fig. 1, 5 and 9, the large-target-surface half-group mobile industrial macro lens provided in embodiments 1 to 3 has a first lens group 1, a fixed second lens group 2 and a protective glass 3 arranged in this order from an object side to an image side along an optical axis, and a variable optical billows 14 arranged in the first lens group 1 and moving with the first lens group 1. The first lens group 1 can move back and forth along the optical axis, so that the distance between the first lens group 1 and the second lens group 2 is adjustable, and the continuous zooming function is realized. The variable iris 14 moves following the first lens group during magnification change, and the relative position of the second lens group in the optical system does not change.

Specifically, the first lens group 1 includes: the object side of the first lens 11 is a convex surface and the image side is a plane, the object side of the second lens 12 is a convex surface and the image side is a concave surface, the object side of the third lens 13 is a convex surface and the image side is a concave surface, the object side of the fourth lens 15 is a concave surface and the image side is a concave surface, the object side of the fifth lens 16 is a convex surface and the image side is a convex surface, the object side of the sixth lens 17 is a plane and the image side is a convex surface, the object side of the seventh lens 18 is a concave surface and the image side is a convex surface; the first lens group 2 includes: the eighth lens element 21 has a concave object surface side and a convex image surface side, and the ninth lens element 22 has a concave object surface side and a convex image surface side.

In an exemplary embodiment, focal lengths of the first lens group and the second lens group satisfy the following conditional expressions:

0.25<|f1/f2|≤0.28

0.8<|f1/f0|<1.1

2.5<|f2/f0|<4.3

where f1 represents the focal length of the first lens group 1, f2 represents the focal length of the second lens group 2, and f0 represents the focal length of the entire lens.

In the embodiment 1-3, the focal length of the first lens 11 ranges from 48.5 to 74.4mm, the focal length of the second lens 12 ranges from 46.3 to 58.7mm, the focal length of the third lens 12 ranges from-25.3 to-24.4 mm, the focal length of the fourth lens 15 ranges from-12.0 to-11.5 mm, the focal length of the fifth lens 16 ranges from 14.0 to 14.2mm, the focal length of the sixth lens 17 ranges from 19.4 to 20.5mm, the focal length of the seventh lens 18 ranges from-31.5 to-31.2 mm, the focal length of the eighth lens 21 ranges from 39.5 to 40.0mm, and the focal length of the ninth lens 22 ranges from-50.3 to-49.3 mm.

Specific examples of a large target surface half-group mobile industrial macro lens that can be applied to the above embodiments are further described below with reference to the accompanying drawings.