CN212276078U - Fixed focus optical lens - Google Patents
Fixed focus optical lens Download PDFInfo
- Publication number
- CN212276078U CN212276078U CN202020861606.5U CN202020861606U CN212276078U CN 212276078 U CN212276078 U CN 212276078U CN 202020861606 U CN202020861606 U CN 202020861606U CN 212276078 U CN212276078 U CN 212276078U
- Authority
- CN
- China
- Prior art keywords
- lens
- focal length
- optical device
- group
- optical
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Lenses (AREA)
Abstract
The utility model belongs to the technical field of optical imaging, concretely relates to tight optical lens, including optical device, optical device sets gradually focusing group S1 that has positive focal power and fixed group S2 that has positive focal power to the image space by the object space, focusing group S1 includes first cemented lens U1, diaphragm, second cemented lens U2 and third cemented lens U3, fixed group S2 includes ninth lens G9, optical device 'S focus is f, focusing group S1' S focus is fS1The focal length of the fixed group S2 is fS2Respectively satisfy the relational expressions: 0.80<|fS1/f|<1.40，1.30<|fS2/f|<1.80. The highest resolution of the utility model can reach 200lp/mm and can be matched with 2.5 muThe m pixel chip has a maximum target surface size of 1.1 inch, and low distortion performance.
Description
Technical Field
The utility model belongs to the technical field of optical imaging, concretely relates to tight optical lens.
Background
Nowadays, with the rise of modern industries, the optical lens is more and more widely applied, especially in the detection application fields, such as size measurement, stitch positioning, defect detection of PCB (printed Circuit Board), surface texture of floor tiles, color detection and the like. With the continuous improvement of detection precision, the application of a high-resolution camera is more and more extensive, and the development of the camera presents two main development trends, one is that the size of a chip is unchanged, the size of a pixel is reduced, the size of the pixel is unchanged, and the size of the chip is increased. These two trends also have higher and higher requirements on the resolution and imaging performance of optical lenses used therewith.
In recent years, cameras with 2000 ten thousand pixels on a 1-inch target surface and cameras with 1200 ten thousand pixels on a 1.1-inch target surface are more and more widely applied to machine vision high-precision detection, and at present, a lot of optical lenses capable of being matched with the latter are available on the market, but the number of lenses capable of being matched with the 2000 ten thousand pixel cameras on the 1-inch target surface in terms of resolution is very small, and the cameras have defects in distortion and lens size, and especially have defects in imaging at a short distance. Therefore, the development of the optical lens with high pixels, large target surface and low distortion is more urgent.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a: aiming at the defects of the prior art, the fixed-focus optical lens is provided, the highest resolution can reach 200lp/mm, the fixed-focus optical lens can be matched with a 2.5-micrometer pixel chip, the maximum target surface size is 1.1 inch, and meanwhile, the low distortion performance is considered.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a fixed-focus optical lens comprises an optical device, wherein a focusing group S1 with positive focal power and a fixed group S2 with positive focal power are sequentially arranged from an object side to an image side of the optical device, the focusing group S1 comprises a first cemented lens U1, a diaphragm, a second cemented lens U2 and a third cemented lens U3, the fixed group S2 comprises a ninth lens G9, the focal length of the optical device is f, and the focal length of the focusing group S1 is fS1The focal length of the fixed group S2 is fS2Respectively satisfy the relational expressions: 0.80<|fS1/f|<1.40，1.30<|fS2/f|<1.80。
As an improvement of the fixed focus optical lens of the present invention, the focusing group S1 includes a first lens G1 having positive focal power and a meniscus structure, a second lens G2 having positive focal power and a biconvex structure, a third lens G3 having negative focal power and a biconcave structure, a fourth lens G4 having negative focal power and a biconcave structure, a fifth lens G5 having positive focal power and a biconvex structure, a sixth lens G6 having negative focal power and a biconcave structure, a seventh lens G7 having positive focal power and a biconvex structure, and an eighth lens G8 having positive focal power and a biconvex structure, wherein the second lens G2 and the third lens G3 are cemented into the first cemented U1 lens group having negative focal power; the fourth lens G4 and the fifth lens G5 are cemented into the second cemented lens group U2 with positive optical power; the sixth lens G6 and the seventh lens G7 are cemented into the third cemented lens group U3 having negative power.
As an improvement of the fixed focus optical lens of the present invention, the ninth lens G9 is of positive focal power and meniscus structure.
As an improvement of the fixed focus optical 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, and the ninth lens G9 are all spherical mirrors.
As an improvement of a fixed focus optical lens, the distance L from the front surface vertex of the first lens G1 of the optical device to the rear surface vertex of the ninth lens and the focal length f of the optical device satisfy the relation: l/f | > 1.10.
As an improvement of a fixed focus optical lens, optical back intercept BFL of the optical device with optical device's focus f satisfies the relational expression: i BFL/f I is less than 0.35.
As an improvement of a fixed focus optical lens, the half-image height y' of the optical device and the focal length f of the optical device satisfy the relation: the | y'/f | is less than 0.25.
As an improvement of the fixed focus optical lens of the present invention, the focal length of the first lens G1 is fG1Focal length f thereofG1And the ratio of the focal length f of the optical device satisfies the relation: 1.20 < | fG1The/| < 1.50; the focal length of the eighth lens G8 is fG8Focal length f thereofG8And the ratio of the focal length f of the optical device satisfies the relation: 1.00 < | fG8/f|＜1.30。
As an improvement of the fixed focus optical lens of the present invention, the focal length of the first cemented lens group U1 is fU1Focal length f thereofU1And the focal length f of the optical device, satisfies the relation: 2.80 < | fU1The/| < 3.20; the focal length of the second cemented lens group U2 is fU2Focal length f thereofU2And the focal length f of the optical device, satisfies the relation: 2.50 < | fU2The/| < 2.90; the focal length of the third cemented lens group U3 is fU3Focal length f thereofU3And the focal length f of the optical device, satisfies the relation: 2.40 < | fU3/f|＜2.80。
As an improvement of a fixed focus optical lens, focusing group S1 with air space between the fixed group S2 is Dt, air space Dt with the ratio of optical device' S focus f satisfies the relational expression: the | Dt/f | < 0.25.
The beneficial effects of the utility model reside in that, the utility model discloses an optical device, optical device sets gradually the focusing of positive focal power by the object space to the image space and organizes S1 and have the fixed S2 of organizing of positive focal power, focusing group S1 includes first cemented lens U1, diaphragm, second cemented lens U2 and third cemented lens U3, fixed group S2 includes ninth lens G9, optical device 'S focus is f, focusing group S1' S focus is fS1The focal length of the fixed group S2 is fS2Respectively satisfy the relational expressions:0.80<|fS1/f|<1.40，1.30<|fS2/f|<1.80. the optical device of the low-distortion industrial lens with the focal length of 50mm is realized through the structure, the number of an image space F is 2.8, the maximum imaging surface is phi 17.6mm, the maximum resolution can reach 200lp/mm, the optical device can be matched with a 2.5-micrometer pixel chip, when a corresponding 1.1-inch chip is adopted, the pixel can reach two thousand three million pixels, and the maximum optical distortion of a full view field is lower than 0.15%; the light aperture can be flexibly adjusted by adopting a floating focusing mode.
Drawings
Fig. 1 is a schematic structural diagram of an optical device according to the present invention.
Fig. 2 is a graph showing the optical distortion of the optical device of the present invention.
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, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect.
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," "secured," and the like are to be construed broadly and can include, for example, fixed connections, detachable connections, 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 FIGS. 1-2, a fixed focus optical lens comprises an optical device, wherein a focusing group S1 with positive focal power and a fixed group S2 with positive focal power are sequentially arranged from an object side to an image side of the optical device, the focusing group S1 comprises a first cemented lens U1, a diaphragm, a second cemented lens U2 and a third cemented lens U3, the fixed group S2 comprises a ninth lens G9, the focal length of the optical device is f, and the focal length of the focusing group S1 is fS1Fixed set S2 has a focal length fS2Respectively satisfy the relational expressions: 0.80<|fS1/f|<1.40，1.30<|fS2/f|<1.80。
Preferably, the focusing group S1 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 double convex structure, a third lens G3 having a negative focal power and a double concave structure, a fourth lens G4 having a negative focal power and a double concave structure, a fifth lens G5 having a positive focal power and a double convex structure, a sixth lens G6 having a negative focal power and a double concave structure, a seventh lens G7 having a positive focal power and a double convex structure, and an eighth lens G8 having a positive focal power and a double convex structure, and the second lens G2 and the third lens G3 are cemented into a first cemented U1 group having a negative focal power; the fourth lens G4 and the fifth lens G5 are cemented into a second cemented lens group U2 with positive optical power; the sixth lens G6 and the seventh lens G7 are cemented into a third cemented lens group U3 having negative power.
Preferably, the ninth lens G9 has a positive power and a meniscus configuration.
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, the eighth lens G8, and the ninth lens G9 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 ninth lens of the optical device and the focal length f of the optical device satisfy the following relation: l/f | > 1.10.
Preferably, the optical back intercept BFL of the optical device and the focal length f of the optical device satisfy the relation: i BFL/f I is less than 0.35.
Preferably, the half-image height y' of the optical device and the focal length f of the optical device satisfy the relation: the | y'/f | is less than 0.25.
Preferably, the first lens G1 has a focal length fG1Focal length f thereofG1And the ratio of the optical device to the focal length f of the optical device satisfies the relation: 1.20 < | fG1The/| < 1.50; the eighth lens G8 has a focal length fG8Focal length f thereofG8And the ratio of the optical device to the focal length f of the optical device satisfies the relation: 1.00 < | fG8/f|＜1.30。
Preferably, the focal length f of the first cemented lens group U1U1Focal length f thereofU1And the focal length f of the optical device, satisfies the relation: 2.80 < | fU1The/| < 3.20; the focal length f of the second cemented lens group U2U2Focal length f thereofU2And the focal length f of the optical device, satisfies the relation: 2.50 < | fU2The/| < 2.90; the focal length f of the third cemented lens group U3U3Focal length f thereofU3And the focal length f of the optical device, satisfies the relation: 2.40 < | fU3/f|＜2.80。
Preferably, the air interval between the focusing group S1 and the fixed group S2 is Dt, and the ratio of the air interval Dt to the focal length f of the optical device satisfies the following relation: the | Dt/f | < 0.25.
When the object distance of the optical device is changed, the relative position of the fixed group S2 and the image plane is unchanged, and the air interval D between the focusing group S1 and the fixed group S2 is changedtTo make the image sharp.
Furthermore, the aperture of the diaphragm of the optical device is a circular hole, and the aperture of the diaphragm is adjustable within the range of F2.8-F16.
In this example, the optical device data is as follows:
in this example, the focal length F of the optical device is 50mm, the maximum aperture F # is 2.8, and the focal length F of the focusing group S1S1Fix the focal length f of group S2 at 58.73mmS280.0mm, the distance L from the vertex of the front surface of the first lens G1 to the vertex of the rear surface of the ninth lens G9 is 61.8mm, the optical back-focal length BFL is 13.0mm, the half-image height y' is 8.8mm, and the focal length f of the first lens G1G169.2mm, focal length f of the first cemented lens groupU1-155.0mm, focal length f of the second cemented lens groupU2135.2mm, focal length f of the third cemented lens groupU3-129.6mm, the focal length f of the eighth lens G8G856.7mm, air gap Dt＝8.4mm。
Each relation:
|fS1/f|＝1.17；|fS2/f|＝1.60；|L/f|＝1.23；
|BFL/f|＝0.26；|y’/f|＝0.17；|fG1/f|＝1.38；
|fU1/f|＝3.10；|fU2/f|＝2.70；|fU3/f|＝2.59；
|fG8/f|＝1.13；|Dt/f|＝0.16；
satisfy the relation:
0.80<|fS1/f|<1.40，1.30<|fS2/f|<1.80；|L/f|>1.10；
|BFL/f|＜0.35；|y’/f|＜0.25；1.20＜|fG1/f|＜1.50；
2.80＜|fU1/f|＜3.20；2.50＜|fU2/f|＜2.90；2.40＜|fU3/f|＜2.80；
1.00＜|fG8/f|＜1.30；|Dt/f|＜0.25。
FIG. 2 is a graph of optical distortion of the present embodiment, wherein the maximum optical distortion is less than 0.15% over the full field of view;
the optical device of the low-distortion industrial lens with the focal length of 50mm is realized through the structure, the number of an image space F is 2.8, the maximum imaging surface is phi 17.6mm, the maximum resolution can reach 200lp/mm, the optical device can be matched with a 2.5-micrometer pixel chip, when a corresponding 1.1-inch chip is adopted, the pixel can reach two thousand three million pixels, and the maximum optical distortion of a full view field is lower than 0.15%; the light aperture can be flexibly adjusted by adopting a floating focusing mode.
Variations and modifications to the above-described embodiments may become apparent to those skilled in the art from the disclosure and teachings of the above description. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious modifications, replacements or variations made by those skilled in the art on the basis of the present invention belong to the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (10)
1. A fixed focus optical lens, characterized in that: the optical device comprises an optical device, the optical device is provided with a focusing group S1 with positive focal power and a fixed group S2 with positive focal power in sequence from an object side to an image side, the focusing group S1 comprises a first cemented lens U1, a diaphragm, a second cemented lens U2 and a third cemented lens U3, the fixed group S2 comprises a ninth lens G9, the focal length of the optical device is f, and the focal length of the focusing group S1 is fS1The focal length of the fixed group S2 is fS2Respectively satisfy the relational expressions: 0.80<|fS1/f|<1.40，1.30<|fS2/f|<1.80。
2. A fixed focus optical lens as claimed in claim 1, wherein: the focusing group S1 comprises a first lens G1 with positive focal power and a meniscus structure, a second lens G2 with positive focal power and a double convex structure, a third lens G3 with negative focal power and a double concave 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, and an eighth lens G8 with positive focal power and a double convex structure, wherein the second lens G2 and the third lens G3 are cemented into the first cemented U-lens group 1 with negative focal power; the fourth lens G4 and the fifth lens G5 are cemented into the second cemented lens group U2 with positive optical power; the sixth lens G6 and the seventh lens G7 are cemented into the third cemented lens group U3 having negative power.
3. A fixed focus optical lens as claimed in claim 1, wherein: the ninth lens G9 has a positive power and a meniscus configuration.
4. A fixed focus optical lens as claimed in claim 2, wherein: 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, and the ninth lens G9 are all spherical mirrors.
5. A fixed focus optical lens as claimed in claim 2, wherein: the distance L from the vertex of the front surface of the first lens G1 to the vertex of the rear surface of the ninth lens of the optical device and the focal length f of the optical device satisfy the following relation: l/f | > 1.10.
6. A fixed focus optical lens as claimed in claim 1, wherein: the optical back intercept BFL of the optical device and the focal length f of the optical device satisfy the relation: i BFL/f I is less than 0.35.
7. A fixed focus optical lens as claimed in claim 1, wherein: the half-image height y' of the optical device and the focal length f of the optical device satisfy the relation: the | y'/f | is less than 0.25.
8. A fixed focus optical lens as claimed in claim 2, wherein: the focal length of the first lens G1 is fG1Focal length f thereofG1And the ratio of the focal length f of the optical device satisfies the relation: 1.20 < | fG1The/| < 1.50; the focal length of the eighth lens G8 is fG8Focal length f thereofG8And the ratio of the focal length f of the optical device satisfies the relation: 1.00 < | fG8/f|＜1.30。
9. A fixed focus optical lens as claimed in claim 1, wherein: the focal length of the first cemented lens group U1 is fU1Focal length f thereofU1And the focal length f of the optical device, satisfies the relation: 2.80 < | fU1The/| < 3.20; the focal length of the second cemented lens group U2 is fU2Focal length f thereofU2And the focal length f of the optical device, satisfies the relation: 2.50 < | fU2The/| < 2.90; the focal length of the third cemented lens group U3 is fU3Focal length f thereofU3And the focal length f of the optical device, satisfies the relation: 2.40 < | fU3/f|＜2.80。
10. A fixed focus optical lens as claimed in claim 1, wherein: the air interval between the focusing group S1 and the fixed group S2 is Dt, and the ratio of the air interval Dt to the focal length f of the optical device satisfies the relation: the | Dt/f | < 0.25.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020861606.5U CN212276078U (en) | 2020-05-21 | 2020-05-21 | Fixed focus optical lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020861606.5U CN212276078U (en) | 2020-05-21 | 2020-05-21 | Fixed focus optical lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212276078U true CN212276078U (en) | 2021-01-01 |
Family
ID=73880360
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020861606.5U Active CN212276078U (en) | 2020-05-21 | 2020-05-21 | Fixed focus optical lens |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212276078U (en) |
-
2020
- 2020-05-21 CN CN202020861606.5U patent/CN212276078U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111522126A (en) | Fixed focus optical lens | |
| CN108594401B (en) | Large target surface fixed focus machine vision linear array lens | |
| CN212302042U (en) | Large-view-field optical lens | |
| CN109975962B (en) | Bilateral telecentric optical system with long working distance | |
| CN210348042U (en) | High-resolution lens | |
| CN108710195B (en) | Optical system of large target surface machine vision lens | |
| CN110376715B (en) | High-resolution prime lens | |
| CN111190269A (en) | High-resolution industrial lens | |
| CN212302039U (en) | High-resolution optical lens | |
| CN212276078U (en) | Fixed focus optical lens | |
| CN211402907U (en) | High-resolution wide-working-distance low-distortion industrial lens | |
| CN109100856B (en) | High-resolution large-target-surface-magnification-adjustable line-scanning machine vision lens | |
| CN110018554B (en) | Wide-angle machine vision lens | |
| CN211857040U (en) | High-pixel low-distortion optical lens | |
| CN210348043U (en) | Low-distortion line scanning lens | |
| CN103235399B (en) | High-pixel macro-focus high-zoom-ratio zooming optical system | |
| CN113820828B (en) | High-resolution fixed-focus lens | |
| CN213276098U (en) | Low-distortion optical lens | |
| CN213843661U (en) | High-resolution low-distortion optical lens | |
| CN210348041U (en) | High-resolution fixed-focus lens | |
| CN213843660U (en) | High-resolution large-view-field industrial lens | |
| CN111142242A (en) | High-resolution wide-working-distance low-distortion industrial lens | |
| CN109884779B (en) | Low-distortion lens | |
| CN209858834U (en) | High-resolution large-image surface scanning lens | |
| CN209858837U (en) | Low-distortion wide-angle lens |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |