CN210348043U - Low-distortion line scanning lens - Google Patents
Low-distortion line scanning lens Download PDFInfo
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- CN210348043U CN210348043U CN201921213923.XU CN201921213923U CN210348043U CN 210348043 U CN210348043 U CN 210348043U CN 201921213923 U CN201921213923 U CN 201921213923U CN 210348043 U CN210348043 U CN 210348043U
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Abstract
The utility model belongs to the technical field of the camera lens, concretely relates to low distortion line sweep lens, including mechanical system and install in the inside optical system of mechanical system, optical system includes by the object space to the first lens G1 that has positive focal power and meniscus structure, the second lens G2 that has positive focal power and meniscus structure, the third lens G3 that has negative focal power and meniscus structure, the fourth lens G4 that has negative focal power and biconcave structure, the fifth lens G5 that has positive focal power and biconvex structure, the sixth lens G6 that has negative focal power and biconcave structure, the seventh lens G7 that has positive focal power and biconvex structure that sets gradually like. The resolution can reach 100lp/mm, namely when the corresponding maximum imaging chip is used, the pixel can reach 12K pixels, and the maximum optical distortion of the full view field is lower than 0.05 percent; the whole group of focusing modes is adopted, and the clear aperture can be flexibly adjusted.
Description
Technical Field
The utility model belongs to the technical field of the camera lens, concretely relates to camera lens is swept to low distortion line.
Background
In industrial automation wave, machine vision systems are widely used in all industries. In the application of precision detection such as electronic manufacturing, liquid crystal display size measurement, circuit board pin detection and the like, a line scanning lens is often adopted to match with a line scan camera to obtain images, and at the moment, the distortion of the lens is an extremely important consideration factor in a machine vision system and directly influences the precision of the vision system. However, the conventional line scan lens in China often has the defects of large optical distortion, low resolution and the like, so the research and development of the low-distortion line scan lens with higher optical performance are more urgent.
In view of the above, the related art needs to be perfected.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a: aiming at the defects of the prior art, the low-distortion line scanning lens is provided, has low distortion and higher resolution, can reach 100lp/mm at most, and can be matched with a 5-micron 12K camera; meanwhile, the method has good chromatic aberration correction capability.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a low-distortion line-scanning lens comprises a mechanical system and an optical system arranged in the mechanical system, wherein the optical system comprises a first lens G1 with positive focal power and a meniscus structure, a second lens G2 with positive focal power and a meniscus structure, a third lens G3 with negative focal power and a meniscus structure, a fourth lens G4 with negative focal power and a double-concave structure, a fifth lens G5 with positive focal power and a double-convex structure, a sixth lens G6 with negative focal power and a double-concave structure, a seventh lens G7 with positive focal power and a double-convex structure, an eighth lens G8 with positive focal power and a meniscus structure, a first cemented U1 with positive focal power is cemented by the second lens G2 and the third lens G3, a second cemented U2 with negative focal power is cemented by the fourth lens G4 and the fifth lens G5, the sixth lens G6 and a seventh lensThe mirror G7 is cemented into a third cemented lens group U3 with negative power, the focal length f of the optical system, and the focal length f of the first cemented lens group U1U1Focal length f of the second cemented lens group U2U2Focal length f of the third cemented lens group U3U3Respectively satisfy the relational expressions: 1.0<|fU1/f|、|fU2/f|<2.5，8<|fU3/f|<15。
As an improvement of the low distortion line-scan lens of the present invention, 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, the eighth lens G8 are all spherical mirrors.
As an improvement of the low distortion line-scan lens of the present invention, the distance L from the front surface vertex of the first lens G1 to the rear surface vertex of the eighth lens G8 and the focal length f of the optical system satisfy the following relation: 0.4 < | L/f | < 0.7.
As an improvement of the low distortion line scanning lens, the optical back intercept BFL of the optical system and the focal length f of the optical system satisfy the relation: 0.7 < | BFL/f | < 1.5.
As an improvement of the low distortion line scanning lens, the half-image height y' of the optical system and the focal length f of the optical system satisfy the relation: the | y'/f | is less than 0.45.
As an improvement of the low distortion line scan lens of the present invention, the refractive index of the first lens G1 is n1, and the refractive index n1 satisfies the following relation: 1.45 < n1 < 1.60.
As an improvement of the low distortion line scan lens of the present invention, the refractive index of the second lens G2 is n2, and the focal length thereof is fG2(ii) a The third lens G3 has a refractive index n3 and a focal length fG3The refractive indexes n2 and n3 satisfy the relation: n2 is more than 1.55 and n3 is less than 1.65; its focal length fG2And fG3The ratio of (A) satisfies the relation: 1 < | fG2/fG3|＜2.0。
As a low distortion lineAn improvement of the scanning lens, the focal length of the fourth lens G4 is fG4The focal length of the fifth lens G5 is fG5Focal length f thereofG4And fU2Ratio of (a) to (b), fG5And fU2The ratio of (A) and (B) simultaneously satisfies the relation: 0.10 < | fG4/fU2|、|fG5/fU2|＜0.35。
As an improvement of the low distortion line scanning lens of the present invention, the focal length of the sixth lens element G6 is fG6The focal length of the seventh lens G7 is fG7Focal length f thereofG6And fU3Ratio of (a) to (b), fG7And fU3The ratio of (A) and (B) simultaneously satisfies the relation: 0.01 < | fG6/fU3|、|fG7/fU3|＜0.10。
As an improvement of the low distortion line scan lens of the present invention, the refractive index of the eighth lens G8 is n8, and the refractive index n8 satisfies the following relation: 1.65 < n8 < 1.8.
As an improvement of the low distortion line scanning lens of the present invention, when the object distance changes, the first lens G1 is changed to the whole group of the eighth lens G8 is moved back and forth as the focusing group.
As an improvement of low distortion line scanning camera lens, still include the diaphragm, the diaphragm set up in third lens G3 with between the fourth lens G4, the aperture of diaphragm is the round hole, the light ring of diaphragm is adjustable at F5.6 ~ F45 within range.
The beneficial effects of the utility model reside in that: the optical system of the line scanning machine vision lens with the focal length of 80mm is realized through the structure, the image space F number is 5.6, and the maximum imaging surface is
The resolution can reach 100lp/mm, namely when the corresponding maximum imaging chip is used, the pixel can reach 12K pixels, and the maximum optical distortion of the full view field is lower than 0.05 percent; the whole group of focusing modes is adopted, and the clear aperture can be flexibly adjusted.
Drawings
The accompanying drawings, which are described herein, serve to provide a further understanding of the invention and constitute a part of this specification, and the exemplary embodiments and descriptions thereof are provided for explaining the invention without unduly limiting it. In the drawings:
fig. 1 is a schematic structural diagram in an embodiment of the present invention;
fig. 2 is a light path diagram of an optical system in an embodiment of the present invention;
fig. 3 is a distortion curve diagram of an optical system in an embodiment of the present invention;
wherein: 0-an optical system; g1 — first lens; g2 — second lens; g3-third lens; g4-fourth lens; g5-fifth lens; g6-sixth lens; g7-seventh lens; g8-eighth lens; 9-a diaphragm; u1 — first cemented lens; u2 — second cemented lens; u3-third cemented lens; l-distance from vertex of front surface of first lens to vertex of back surface of eighth lens; BFL-optical system optical back intercept.
Detailed Description
As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, within which a person skilled in the art can solve the technical problem to substantially achieve the technical result.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "horizontal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
The present invention will be described in further detail with reference to the accompanying drawings, which are not intended to limit the present invention.
As shown in fig. 1-2, a low distortion line-scan lens includes a mechanical system and an optical system 0 installed inside the mechanical system, the optical system 0 includes a first lens G1 having a positive focal power and a meniscus structure, a second lens G2 having a positive focal power and a meniscus structure, a third lens G3 having a negative focal power and a meniscus structure, a fourth lens G4 having a negative focal power and a biconcave structure, a fifth lens G5 having a positive focal power and a biconvex structure, a sixth lens G6 having a negative focal power and a biconcave structure, a seventh lens G7 having a positive focal power and a biconvex structure, an eighth lens G8 having a positive focal power and a meniscus structure, a first cemented U-shaped lens group 1 having a positive focal power cemented by the second lens G2 and the third lens G3, a second cemented U-shaped lens group 2 having a negative focal power cemented by the fourth lens 4 and the fifth lens G5, the sixth lens G6 and the seventh lens G7 are cemented into a third cemented lens group U3 having negative power, a focal length f of the optical system 0, and a focal length f of the first cemented lens group U1U1Focal length f of the second cemented lens group U2U2Focal length f of the third cemented lens group U3U3Respectively satisfy the relational expressions: 1.0<|fU1/f|、|fU2/f|<2.5，8<|fU3/f|<15。
Preferably, 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 are all spherical mirrors.
Preferably, the distance L from the vertex of the front surface of the first lens G1 to the vertex of the rear surface of the eighth lens G8 and the focal length f of the optical system 0 satisfy the relationship: 0.4 < | L/f | < 0.7.
Preferably, the optical back intercept BFL of the optical system 0 and the focal length f of the optical system 0 satisfy the relationship: 0.7 < | BFL/f | < 1.5.
Preferably, the half-image height y' of the optical system 0 and the focal length f of the optical system 0 satisfy the following relation: the | y'/f | is less than 0.45.
Preferably, the refractive index of the first lens G1 is n1, and the refractive index n1 satisfies the relation: 1.45 < n1 < 1.60.
Preferably, the refractive index of the second lens G2 is n2, and the focal length thereof is fG2(ii) a The third lens G3 has a refractive index n3 and a focal length fG3The refractive indexes n2 and n3 satisfy the relation: n2 is more than 1.55 and n3 is less than 1.65; its focal length fG2And fG3The ratio of (A) satisfies the relation: 1 < | fG2/fG3|＜2.0。
Preferably, the fourth lens G4 has a focal length fG4The focal length of the fifth lens G5 is fG5Focal length f thereofG4And fU2Ratio of (a) to (b), fG5And fU2The ratio of (A) and (B) simultaneously satisfies the relation: 0.10 < | fG4/fU2|、|fG5/fU2|＜0.35。
Preferably, the sixth lens G6 has a focal length fG6The focal length of the seventh lens G7 is fG7Focal length f thereofG6And fU3Ratio of (a) to (b), fG7And fU3The ratio of (A) and (B) simultaneously satisfies the relation: 0.01 < | fG6/fU3|、|fG7/fU3|＜0.10。
Preferably, the refractive index of the eighth lens G8 is n8, and the refractive index n8 satisfies the relationship: 1.65 < n8 < 1.8.
Preferably, when the object distance is changed, the entire group of the first through eighth lenses G1 through G8 moves back and forth as a focusing group.
The utility model discloses still include diaphragm 9, diaphragm 9 sets up between third lens G3 and fourth lens G4, and diaphragm 9's aperture is the round hole, and diaphragm 9's light ring is adjustable at F5.6 ~ F45 within range.
In this example, optical system 0 data is as follows:
in this example, the focal length F of the optical system 0 is 80mm, the maximum aperture is F # 5.6, and the focal length F of the first cemented lens group U1U1Focal length f of the second cemented lens group U2 ═ 149.05mmU2Focal length f of the third cemented lens group U3 ═ 124.32mmU3898.39mm, the distance L from the vertex of the front surface of the first lens G1 to the vertex of the rear surface of the eighth lens G8 is 45.00mm, the optical back-focal length BFL is 78.60mm, the half-image height y' is 31.5mm, and the focal length f of the second lens G2G2Focal length f of the third lens G3-42.71 mmG3Focal length f of fourth lens G4 of-29.64 mmG422.84mm, focal length f of fifth lens G5G530.59mm, focal length f of sixth lens G6G6-39.11mm, focal length f of seventh lens G7G7＝40.73mm
Each relation: l fU1/f|＝1.86；|fU2/f|＝1.55；|fU3/f|＝11.22；
|L/f|＝0.56；|BFL/f|＝0.98；|y’/f|＝0.39；|fG2/fG3|＝1.44|fG4/fU2|＝0.18；|fG5/fU2|＝0.25；|fG6/fU3|＝0.044；|fG7/fU3|＝0.045；
Satisfy the relation: 1.0<|fU1/f|、|fU2/f|<2.5，8<|fU3/f|<15；
0.4＜|L/f|＜0.7；0.7＜|BFL/f|＜1.5；|y’/f|＜0.45；
1＜|fG2/fG3|＜2.0；0.10＜|fG4/fU2|、|fG5/fU2|＜0.35；
0.01＜|fG6/fU3|、|fG7/fU3|＜0.10。
FIG. 3 is a graph showing the optical distortion of the present embodiment, wherein the maximum optical distortion is less than 0.05% in the full field of view;
by adopting the structure, the optical system 0 of the line scanning machine vision lens with the focal length of 80mm is realized, the image space F number is 5.6, and the maximum imaging surface is
The resolution can reach 100lp/mm, namely when the corresponding maximum imaging chip is used, the pixel can reach 12K pixels, and the maximum optical distortion of the full view field is lower than 0.05 percent; the whole group of focusing modes is adopted, and the clear aperture can be flexibly adjusted.
While the foregoing description shows and describes several preferred embodiments of the invention, it is to be understood, as noted above, that the invention is not limited to the forms disclosed herein, but is not intended to be exhaustive or to exclude other embodiments and may be used in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. But that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention, which is to be limited only by the claims appended hereto.
Claims (10)
1. The low-distortion line-scanning lens is characterized by comprising a mechanical system and an optical system (0) arranged in the mechanical system, wherein the optical system (0) comprises a first lens G1 with positive focal power and a meniscus structure, a second lens G2 with positive focal power and a meniscus structure, a third lens G3 with negative focal power and a meniscus structure, a fourth lens G4 with negative focal power and a biconcave structure, a fifth lens G5 with positive focal power and a biconvex structure, a sixth lens G6 with negative focal power and a biconcave structure, a seventh lens G7 with positive focal power and a biconvex structure, and a third lens G7 with positive focal power and a biconvex structure which are sequentially arranged from an object space to an image spaceAn eighth lens G8 with focal power and meniscus structure, a first cemented lens group U1 with positive focal power cemented by the second lens G2 and the third lens G3, a second cemented lens group U2 with negative focal power cemented by the fourth lens G4 and the fifth lens G5, a third cemented lens group U3 with negative focal power cemented by the sixth lens G6 and the seventh lens G7, a focal length f of the optical system (0), and a focal length f of the first cemented lens group U1U1Focal length f of the second cemented lens group U2U2Focal length f of the third cemented lens group U3U3Respectively satisfy the relational expressions: 1.0<|fU1/f|、|fU2/f|<2.5，8<|fU3/f|<15。
2. The low distortion line scan lens of claim 1, wherein a distance L from a vertex of a front surface of the first lens G1 to a vertex of a rear surface of the eighth lens G8 and a focal length f of the optical system (0) satisfy the relation: 0.4 < | L/f | < 0.7.
3. The low distortion line scan lens of claim 1, wherein the optical back intercept BFL of the optical system (0) and the focal length f of the optical system (0) satisfy the relationship: 0.7 < | BFL/f | < 1.5.
4. The low distortion line scan lens of claim 1, wherein the half image height y' of the optical system (0) and the focal length f of the optical system (0) satisfy the relation: the | y'/f | is less than 0.45.
5. The low distortion line scan lens of claim 1, wherein the refractive index of the first lens G1 is n1, and the refractive index n1 satisfies the relation: 1.45 < n1 < 1.60.
6. The low distortion line scan lens of claim 1, wherein said second lens G2 has refractive index n2 and focal length fG2(ii) a The third lens G3 has a refractive index n3 and a focal length fG3Having refractive indices n2 and n3 satisfyingThe relation is as follows: n2 is more than 1.55 and n3 is less than 1.65; its focal length fG2And fG3The ratio of (A) satisfies the relation: 1 < | fG2/fG3|＜2.0。
7. The low distortion line scan lens of claim 1, wherein said fourth lens G4 has a focal length fG4The focal length of the fifth lens G5 is fG5Focal length f thereofG4And fU2Ratio of (a) to (b), fG5And fU2The ratio of (A) and (B) simultaneously satisfies the relation: 0.10 < | fG4/fU2|、|fG5/fU2|＜0.35。
8. The low distortion line scan lens of claim 1, wherein said sixth lens G6 has a focal length fG6The focal length of the seventh lens G7 is fG7Focal length f thereofG6And fU3Ratio of (a) to (b), fG7And fU3The ratio of (A) and (B) simultaneously satisfies the relation: 0.01 < | fG6/fU3|、|fG7/fU3|＜0.10。
9. The low distortion line scan lens of claim 1, wherein the refractive index of the eighth lens G8 is n8, and the refractive index n8 satisfies the relation: 1.65 < n8 < 1.8.
10. The low distortion line scan lens of claim 1, further comprising a diaphragm (9), wherein the diaphragm (9) is disposed between the third lens G3 and the fourth lens G4, the aperture of the diaphragm (9) is a circular hole, and the aperture of the diaphragm (9) is adjustable within a range of F5.6-F45.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110346918A (en) * | 2019-07-30 | 2019-10-18 | 广东奥普特科技股份有限公司 | The low distortion line of one kind sweeps camera lens |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110346918A (en) * | 2019-07-30 | 2019-10-18 | 广东奥普特科技股份有限公司 | The low distortion line of one kind sweeps camera lens |
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