CN213780509U - Optical system and 20mm large target surface lens - Google Patents
Optical system and 20mm large target surface lens Download PDFInfo
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- CN213780509U CN213780509U CN201921846148.1U CN201921846148U CN213780509U CN 213780509 U CN213780509 U CN 213780509U CN 201921846148 U CN201921846148 U CN 201921846148U CN 213780509 U CN213780509 U CN 213780509U
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- 230000003287 optical effect Effects 0.000 title claims abstract description 40
- 230000035945 sensitivity Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 6
- 230000004075 alteration Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
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Abstract
The embodiment of the utility model discloses optical system and 20mm big target surface camera lens, optical system includes first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, eighth lens, the ninth lens that set gradually along the optical axis from the object plane to the image plane, first lens, fifth lens, sixth lens, ninth lens object plane side are the convex surface, and the image plane side is the concave surface; the object plane sides of the second lens and the third lens are concave surfaces, and the image plane side is a convex surface; the object plane sides of the fourth lens and the eighth lens are convex surfaces, and the image plane side is a convex surface; the object side of the seventh lens is a concave surface, and the image side of the seventh lens is a concave surface; and the optical system satisfies: -4.05<f1/f<‑2.12；1.06<f9/f<3.11 wherein f1、f9F is the focal length of the first and ninth lenses, and f is the overall focal length of the optical system. The utility model provides a little problem of the little light ring of target surface, effectively reduced the colour difference of telephoto lens, reduced the structural tolerance sensitivity for the whole image plane of camera lens is even, luminance is high, the target surface is big.
Description
Technical Field
The utility model relates to an optics module technical field that makes a video recording especially relates to an optical system and big target surface camera lens of 20 mm.
Background
The telephoto lens has strong telephoto capability, so that the telephoto lens is widely applied to long-distance monitoring. The long-distance monitoring needs larger light transmission quantity to ensure the brightness of the image, so that a lens is required to have a large light transmission aperture. However, the current common telephoto lens aperture is generally about F2.0, the light flux amount is small, the target surface is generally 1/3 '-1/2', and the light sensing capability is poor. The overall image quality is generally poor in the night environment. Therefore, it is necessary to develop a high-sensitivity imaging chip with 2/3 "and a telephoto lens with a maximum image plane exceeding 2/3" and a maximum aperture reaching F1.4, so that a clear and bright image can be obtained even in a night environment.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a technical problem that will solve provides an optical system and the big target surface camera lens of 20mm to make the little problem of aperture of target surface of solving.
In order to solve the above technical problem, an embodiment of the present invention provides an optical system, including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a ninth lens, which are sequentially disposed from an object plane to an image plane along an optical axis, wherein the object plane side of the first lens is a convex surface, and the image plane side of the first lens is a concave surface; the object side of the second lens is a concave surface, and the image side of the second lens is a convex surface; the object plane side of the third lens is a concave surface, and the image plane side of the third lens is a convex surface; the object plane side of the fourth lens is a convex surface, and the image plane side of the fourth lens is a convex surface; the object plane side of the fifth lens is a convex surface, and the image plane side of the fifth lens is a concave surface; the object side of the sixth lens is a convex surface, and the image side isA concave surface; the object side of the seventh lens is a concave surface, and the image side of the seventh lens is a concave surface; the object plane side of the eighth lens is a convex surface, and the image plane side of the eighth lens is a convex surface; the object plane side of the ninth lens is a convex surface, and the image plane side of the ninth lens is a concave surface; and the optical system satisfies: -4.05<(f1/f)<-2.12；1.06<(f9/f)<3.11, wherein f1Is the first lens focal length, wherein f9F is the focal length of the ninth lens and the overall focal length of the optical system.
Further, the focal length f of the first lens1The following conditions are satisfied: f. of1＝-70mm～-40mm。
Further, the second lens and the third lens are a set of cemented lenses.
Further, the focal length f of the second lens2The following conditions are satisfied: f. of2-16.8 to-9.6 mm; focal length f of the third lens3The following conditions are satisfied: f. of3＝16mm～21mm。
Further, the focal length f of the fourth lens4The following conditions are satisfied: f. of4＝24mm～29mm。
Further, the fifth lens and the sixth lens are a set of cemented lenses.
Further, a focal length f of the fifth lens5The following conditions are satisfied: f. of518 mm-23 mm; focal length f of sixth lens6The following conditions are satisfied: f. of6＝-20mm～-15mm。
Further, a focal length f of the seventh lens7The following conditions are satisfied: f. of7＝-27mm～-22mm。
Further, the seventh lens and the eighth lens are a set of cemented lenses.
Correspondingly, the embodiment of the utility model provides a 20mm big target surface camera lens is still provided, install foretell optical system in the camera lens.
The utility model has the advantages that: the utility model solves the problem that the target surface of the lens with the diameter of 20mm is small and the aperture is small, effectively reduces the chromatic aberration of the telephoto lens, reduces the sensitivity of the structural tolerance, and ensures that the whole image surface of the lens is uniform, the brightness is high and the target surface is large; the utility model discloses constitute by 9 lenses, with low costs, effective angle of vision reaches 34 degrees, and the light ring reaches F1.4, can match 2/3 "chip the biggest.
Drawings
Fig. 1 is a schematic structural diagram of an optical system according to an embodiment of the present invention.
Fig. 2 is a first analysis diagram of an optical system according to an embodiment of the present invention.
Fig. 3 is a second analysis diagram of the optical system according to the embodiment of the present invention.
Fig. 4 is a field curvature diagram of an optical system according to an embodiment of the present invention.
Fig. 5 is a distortion diagram of the optical system according to the embodiment of the present invention.
Fig. 6 is a relative illuminance diagram of an optical system according to an embodiment of the present invention.
Detailed Description
It should be noted that, in the present application, the embodiments and features of the embodiments may be combined with each other without conflict, and the present invention is further described in detail with reference to the accompanying drawings and specific embodiments.
In the embodiment of the present invention, if there is directional indication (such as upper, lower, left, right, front, and rear … …) only for explaining the relative position relationship between the components and the motion situation under a certain posture (as shown in the drawing), if the certain posture is changed, the directional indication is changed accordingly.
In addition, the descriptions of the first, second, etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying any relative importance or implicit indication of the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
Referring to fig. 1 to 6, an optical system according to an embodiment of the present invention includes a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8, and a ninth lens 9, which are sequentially disposed along an optical axis from an object plane to an image plane.
The object surface side of the first lens 1 is convex, and the image surface side is concave. The object surface side of the second lens 2 is a concave surface, and the image surface side is a convex surface. The object plane side of the third lens 3 is a concave surface, and the image plane side is a convex surface. The fourth lens element 4 has a convex object surface side and a convex image surface side. The fifth lens element 5 has a convex object surface side and a concave image surface side. The sixth lens element 6 has a convex object surface side and a concave image surface side. The seventh lens 7 has a concave object surface side and a concave image surface side. The eighth lens element 8 has a convex object surface side and a convex image surface side. The ninth lens 9 has a convex object surface side and a concave image surface side.
The optical system satisfies: -4.05<(f1/f)<-2.12；1.06<(f9/f)<3.11, wherein f1Is the focal length of the first lens 1, wherein f9Is the focal length of the ninth lens 9, and f is the overall focal length of the optical system.
As an embodiment, the focal length f of the first lens 11The following conditions are satisfied: f. of1＝-70mm～-40mm。
As an embodiment, the second lens 2 and the third lens 3 are a set of cemented lenses.
As an embodiment, the focal length f of the second lens 22The following conditions are satisfied: f. of2-16.8 to-9.6 mm; focal length f of the third lens 33The following conditions are satisfied: f. of3＝16mm～21mm。
As an embodiment, the focal length f of the fourth lens 44The following conditions are satisfied: f. of4＝24mm～29mm。
As an embodiment, the fifth lens 5 and the sixth lens 6 are a set of cemented lenses.
As an embodiment, the focal length f of the fifth lens 55The following conditions are satisfied: f. of518 mm-23 mm; focal length f of sixth lens 66The following conditions are satisfied: f. of6＝-20mm～-15mm。
As an embodiment, the focal length f of the seventh lens 77The following conditions are satisfied: f. of7＝-27mm～-22mm。
As an embodiment, the seventh lens 7 and the eighth lens 8 are a set of cemented lenses.
In the embodiment of the present invention, when the working distance is infinite, the total focal length f of the lens is 20mm, FNO is 1.4, the field angle FOV is 34 °, matching 2/3 ″ chip, and the parameters of the pixel reaching 500 ten thousand lens sets are listed in table 1 in sequence:
TABLE 1
In the above table and in fig. 1, S1, S2 correspond to two surfaces of the first lens 1 from the object plane to the image plane along the optical axis; s3, S4 correspond to both surfaces of the second lens 2; s4, S5 correspond to both surfaces of the third lens 3 (S4 is a common surface where the second lens 2 and the third lens 3 are cemented), and S6, S7 correspond to both surfaces of the fourth lens 4; STO is where stop ST is located; s8, S9 correspond to both surfaces of the fifth lens 5; s9, S10 correspond to both surfaces of the sixth lens 6, and S11, S12 correspond to both surfaces of the seventh lens 7; s12, S13 correspond to both surfaces of the eighth lens 8; s14, S15 correspond to both surfaces of the ninth lens 9.
The utility model discloses install foretell optical system in the camera lens of the big target surface camera lens of 20 mm.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. An optical system comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens which are arranged in sequence from an object plane to an image plane along an optical axis, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens and the ninth lens are arranged in sequence from the object plane to the image plane along the optical axisThe lens object surface side is a convex surface, and the image surface side is a concave surface; the object side of the second lens is a concave surface, and the image side of the second lens is a convex surface; the object plane side of the third lens is a concave surface, and the image plane side of the third lens is a convex surface; the object plane side of the fourth lens is a convex surface, and the image plane side of the fourth lens is a convex surface; the object plane side of the fifth lens is a convex surface, and the image plane side of the fifth lens is a concave surface; the object plane side of the sixth lens is a convex surface, and the image plane side of the sixth lens is a concave surface; the object side of the seventh lens is a concave surface, and the image side of the seventh lens is a concave surface; the object plane side of the eighth lens is a convex surface, and the image plane side of the eighth lens is a convex surface; the object plane side of the ninth lens is a convex surface, and the image plane side of the ninth lens is a concave surface; and the optical system satisfies: -4.05<(f1/f)<-2.12；1.06<(f9/f)<3.11, wherein f1Is the first lens focal length, wherein f9F is the focal length of the ninth lens and the overall focal length of the optical system.
2. The optical system of claim 1, wherein the first lens has a focal length f1The following conditions are satisfied: f. of1=-70 mm～-40mm。
3. The optical system of claim 1, wherein the second lens and the third lens are a set of cemented lenses.
4. The optical system of claim 3, wherein the focal length f of the second lens is2The following conditions are satisfied: f. of2= 16.8mm to-9.6 mm; focal length f of the third lens3The following conditions are satisfied: f. of3=16 mm～21mm。
5. The optical system of claim 1, wherein the fourth lens has a focal length f4The following conditions are satisfied: f. of4=24 mm～29mm。
6. The optical system of claim 1 wherein the fifth lens and the sixth lens are a set of cemented lenses.
7. The optical system of claim 6, whichCharacterised by the focal length f of the fifth lens5The following conditions are satisfied: f. of5=18mm to 23 mm; focal length f of sixth lens6The following conditions are satisfied: f. of6=-20mm～-15mm。
8. The optical system of claim 1, wherein the seventh lens has a focal length f7The following conditions are satisfied: f. of7=-27mm～-22mm。
9. The optical system of claim 1, wherein the seventh lens and the eighth lens are a set of cemented lenses.
10. A lens with a large target surface of 20mm, characterized in that the optical system according to any one of claims 1-9 is mounted in the lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921846148.1U CN213780509U (en) | 2019-10-30 | 2019-10-30 | Optical system and 20mm large target surface lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921846148.1U CN213780509U (en) | 2019-10-30 | 2019-10-30 | Optical system and 20mm large target surface lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213780509U true CN213780509U (en) | 2021-07-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921846148.1U Expired - Fee Related CN213780509U (en) | 2019-10-30 | 2019-10-30 | Optical system and 20mm large target surface lens |
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| Country | Link |
|---|---|
| CN (1) | CN213780509U (en) |
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2019
- 2019-10-30 CN CN201921846148.1U patent/CN213780509U/en not_active Expired - Fee Related
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