CN109856787A - Zoom lens - Google Patents
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- CN109856787A CN109856787A CN201811623338.7A CN201811623338A CN109856787A CN 109856787 A CN109856787 A CN 109856787A CN 201811623338 A CN201811623338 A CN 201811623338A CN 109856787 A CN109856787 A CN 109856787A
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- 230000003287 optical effect Effects 0.000 claims abstract description 10
- 230000000694 effects Effects 0.000 abstract description 7
- 238000011982 device technology Methods 0.000 abstract 1
- 230000004075 alteration Effects 0.000 description 22
- 239000011521 glass Substances 0.000 description 4
- 230000007547 defect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 206010010071 Coma Diseases 0.000 description 1
- 201000009310 astigmatism Diseases 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005549 size reduction Methods 0.000 description 1
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Abstract
The invention belongs to field of optical device technology, more particularly to a kind of zoom lens, it successively include the first lens group G1 of positive diopter, the second lens group G2 of negative diopter, the third lens group G3 of positive diopter and the 4th lens group G4 of positive diopter from object side to image planes side；When from wide-angle side to telescope end zoom, first lens group G1 is fixed, and the second lens group G2 is mobile by the lateral image planes side of object, and the third lens group G3 is first mobile from object side to image planes side, midway is turned back from image planes side to the movement of object side direction, and the 4th lens group G4 is mobile by the lateral object side direction of image planes；First lens group G1 include three pieces of negative lens groups at negative diopter before organize G1a, two pieces of positive lens groups at middle groups G1b and positive diopter after group G1c composition, when object is mobile to short distance from infinity, middle groups G1b realizes focus by the lateral image planes side of object is mobile；Zoom lens compact provided by the invention, performance is high, and effect at low cost, zoom ratio is more than 3 times.
Description
Technical Field
The invention belongs to the technical field of optical devices, and particularly relates to a zoom lens.
Background
At present, the known zoom film lens mostly has a first fixed group with diopter as positive, and a structure combining a plurality of moving groups is more, such as that disclosed in japanese patent laid-open No. 2015-4917: from one side of the object, the first group is fixed with positive diopter, the negative diopter 2 nd group, the negative diopter 3 rd lens group, the positive diopter 4 th group and the fixed positive diopter 5 th group are respectively moved, and when the object is moved from infinity to close range, the focusing group is a part of the middle of the first group and moves towards the image surface direction for focusing.
Also disclosed in Japanese patent laid-open No. 2015-18083: from one side of the object, the first group is fixed with positive diopter, the negative diopter 2 nd group, the negative diopter 3 rd lens group, the negative diopter 4 th group and the fixed positive diopter 5 th group are respectively moved, when the object is moved from infinity to close range, the focusing group is a part of the middle of the first group, and the object is moved towards the image surface to focus.
Although the structure realizes high performance including the zooming function of more than 3 times, the structure has the defects of too many moving groups, too complex structure, large volume, high manufacturing difficulty, high cost and the like due to the adoption of aspheric correction.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a zoom lens which has the advantages of simple structure, small size and low manufacturing cost.
In order to achieve the purpose, the invention adopts the following technical scheme:
a zoom lens includes, in order from an object side to an image surface side, a first lens group G1 of positive refractive power, a second lens group G2 of negative refractive power, a third lens group G3 of positive refractive power, and a fourth lens group G4 of positive refractive power;
when zooming from the wide-angle end to the telephoto end, the first lens group G1 is fixed, the second lens group G2 moves from the object side to the image surface side, the third lens group G3 moves from the object side to the image surface side first, turns back in the middle, moves from the image surface side to the object side, and the fourth lens group G4 moves from the image surface side to the object side;
the first lens group G1 comprises a negative diopter front group G1a consisting of three negative lenses, a middle group G1b consisting of two positive lenses and a positive diopter rear group G1c, and when an object moves from infinity to close distance, the middle group G1b moves from the object side to the image plane side to realize focusing;
the zoom lens also satisfies the following conditional expression:
3≤WL/F1b≤7 (1)
2.5≤|F1c/F1b|≤6.5 (2)
0.1≤|Tbc/Fw|≤0.4 (3)
wherein,
WL: the optical total length of the zoom lens; the optical total length is the distance from the first surface of the object side to the image surface;
f1 b: the focal length of the intermediate group G1b of the first lens group G1;
f1 c: focal length of rear group G1c of first lens group G1;
tbc: the air space of the middle group G1b and the rear group G1c in the first lens group G1 in the infinity state;
fw: and an optical focal length at the wide-angle end in an infinite state.
Preferably, the first lens group G1 satisfies the following conditional expression:
0.5≤|F1a/F1|≤0.8 (4)
wherein,
f1 a: focal length of front group G1a in the first lens group G1;
f1: the focal length of the first lens group G1 in the infinity state.
Preferably, the third lens group G3 is folded halfway to form a U-shaped moving locus when moving from the wide-angle end to the telephoto end, and the following conditional expression is satisfied:
0.5≤(S2+S3+S4)/(Fw×Z)≤0.8 (5)
wherein,
s2: a total moving amount of the second lens group G2 upon zooming from the wide-angle end to the telephoto end;
s3: a total moving amount of the third lens group G3 upon zooming from the wide-angle end to the telephoto end;
s4: a total moving amount of the fourth lens group G4 upon zooming from the wide-angle end to the telephoto end;
fw: an optical focal length at the wide-angle end in an infinite state;
z: zoom magnification.
In the present invention, if the upper limit of the conditional expression (1) is exceeded, the total length of the lens is too long, or the diopter of the intermediate group G1b is too strong, which results in a large volume, or a low performance because the diopter of the focal group is too strong; if the lower limit of the conditional expression (1) is exceeded, miniaturization can be achieved, but the focusing group diopter is too weak, the focusing movement distance is large, and finally the close-up capability is difficult to achieve.
In the present invention, if the upper limit of the conditional expression (2) is exceeded, the diopter of the intermediate group G1b of the first lens group G1 becomes strong, which improves the close-up capability, but if it is too strong, it causes spherical aberration, distortion, and other various aberrations that cannot be well corrected, which leads to low performance, and if it exceeds the lower limit of the conditional expression (2), it is easy to correct the performance, but if it is too weak, the intermediate group G1b causes an increase in the amount of focus shift, a large volume, and if the volume is controlled, it causes a decrease in the close-up capability, which fails to achieve a good balance between the volume and the performance.
In the present invention, if the upper limit of the conditional expression (3) is exceeded, the distance between the middle group G1b and the rear group G1c in the first lens group G1 is too large, and although the close-up capability is easily realized, the lens size is large, and particularly the weight of the front group large-diameter lens is increased sharply, and the size, cost and processing difficulty are increased, and a compact and low-cost zoom lens cannot be realized. If the distance between the middle group G1b and the rear group G1c is too small, the lower limit of the conditional expression (3) is exceeded, and the size reduction is easy to achieve, but the focal distance is small, and it is difficult to achieve a good close-up capability.
In the present invention, if the upper limit of the conditional expression (4) is exceeded, the negative diopter of the front group G1a in the first lens group G1 is too weak, and since both the middle group G1b and the rear group G1c have positive diopter, it is difficult to achieve the function of compensating for the positive and negative aberrations with each other, and since the negative diopter is too weak, the wide angle effect cannot be achieved. If the lower limit of the conditional expression (4) is exceeded, although the positive and negative aberration correction effects can be achieved well, since the negative power is too strong, excessive aberrations such as edge coma, astigmatism, and the like are also generated, which are difficult to correct.
In the present invention, if the upper limit of the conditional expression (5) is exceeded, the amount of movement of the second lens group G2, the third lens group G3, and the fourth lens group G4 is too large, and the high magnification effect can be achieved well, but the optical system becomes bulky, and the cost increases. If the lower limit of the conditional expression (5) is exceeded, although a small volume can be realized, if the same zoom magnification is to be realized, the diopter of each lens group is increased, which causes various aberrations to be generated, and it is difficult to realize a high performance.
Compared with the prior art, the invention has the following technical effects:
according to the invention, through reasonable lens group matching and a specified moving mode, the effects of small size, high performance and low cost can be realized, and the zoom lens with the zoom magnification exceeding 3 times is realized.
Drawings
Fig. 1 is a schematic view of a zoom lens provided in embodiment 1;
FIG. 2 is a diagram showing the spherical aberration, the field curvature aberration, the distortion aberration and the chromatic aberration of magnification at infinity and the closest photographing distance in example 1;
fig. 3 is a schematic view of a zoom lens provided in embodiment 2;
FIG. 4 shows the spherical aberration, the field curvature aberration, the distortion aberration and the chromatic aberration of magnification at infinity and the closest photographing distance in example 2.
Detailed Description
In order to make the technical means, the creation features, the achievement purposes and the effects of the invention easy to understand, the invention is further clarified with the specific embodiments.
Example 1
As shown in fig. 1, the lens assembly includes, in order from the object side to the image surface side, a first lens group G1 with positive refractive power, a second lens group G2 with negative refractive power, a third lens group G3 with positive refractive power, and a fourth lens group G4 with positive refractive power;
when zooming from the wide-angle end to the telephoto end, the first lens group G1 is fixed, the second lens group G2 moves from the object side to the image plane side, the moving amount is S2, the third lens group G3 moves from the object side to the image plane side first, the third lens group G3 folds halfway to move from the image plane side to the object side, the total moving amount is S3, and the fourth lens group G4 moves from the image plane side to the object side; the first lens group G1 comprises three parts, namely a negative diopter front group G1a consisting of three negative lenses, a middle group G1b consisting of two positive lenses and a positive diopter rear group G1 c; when the object moves from infinity to close distance, the intermediate group G1b moves from the object side to the image plane side to achieve focusing.
Infinity, spherical aberration at the closest photographing distance, field curvature aberration, distortion aberration and chromatic aberration of magnification of example 1 are shown in fig. 2.
The data for example 1 is as follows:
wherein,
r (mm): the radius of curvature of each face;
d (mm): lens spacing and lens thickness;
nd: refractive index of each glass of d-line;
vd: abbe number of the glass;
focal point distance: 20.8060-36.2317-77.8754;
Fno：2.8～2.8～2.8；
half-picture angle ω: 34.65-20.5-9.85;
| focal distance | 20.806 | 36.2317 | 77.8754 |
| D(6) | 0.8054 | 0.8054 | 0.8054 |
| D(10) | 5.4231 | 5.4231 | 5.4231 |
| D(15) | 0.9665 | 18.1879 | 29.5193 |
| D(23) | 33.9078 | 22.2733 | 1.4163 |
| D(28) | 21.6004 | 12.1571 | 10.0212 |
| D(36) | 28.2757 | 32.1271 | 43.7612 |
Example 2
As shown in fig. 3, the lens system comprises, in order from the object side to the image surface side, a first lens group G1 with positive refractive power, a second lens group G2 with negative refractive power, a third lens group G3 with positive refractive power, and a fourth lens group G4 with positive refractive power;
when zooming from the wide-angle end to the telephoto end, the first lens group G1 is fixed, the second lens group G2 moves from the object side to the image plane side, the moving amount is S2, the third lens group G3 moves from the object side to the image plane side first, the third lens group G3 folds halfway to move from the image plane side to the object side, the total moving amount is S3, and the fourth lens group G4 moves from the image plane side to the object side; the first lens group G1 comprises three parts, namely a negative diopter front group G1a consisting of three negative lenses, a middle group G1b consisting of two positive lenses and a positive diopter rear group G1 c; when the object moves from infinity to close distance, the intermediate group G1b moves from the object side to the image plane side to achieve focusing.
Fig. 4 shows infinity, spherical aberration at the closest photographing distance, field curvature aberration, distortion aberration, and chromatic aberration of magnification in example 2.
The data for example 2 is as follows:
wherein,
r (mm): the radius of curvature of each face;
d (mm): lens spacing and lens thickness;
nd: refractive index of each glass of d-line;
vd: abbe number of the glass;
focal point distance: 23.0191-40.1343-86.2597;
Fno：2.8～2.8～2.8；
half-picture angle ω: 32.2 to 18.9 to 9.05;
| focal distance | 23.0191 | 40.1343 | 86.2597 |
| D(6) | 1.7834 | 1.7834 | 1.7834 |
| D(10) | 4.7568 | 4.7568 | 4.7568 |
| D(15) | 1.1774 | 18.6681 | 29.7437 |
| D(23) | 38.977 | 25.4396 | 1.6766 |
| D(29) | 18.0305 | 9.3741 | 7.7281 |
| D(37) | 31.326 | 36.0291 | 50.3625 |
The condition formula satisfies the condition:
| example 1 | Example 2 | |
| Conditional expression (1) WL/F1b ≤ 3 and 7 | 5.802 | 5.752 |
| The conditional formula (2) is more than or equal to 2.5 and less than or equal to | F1c/F1b | and less than or equal to 6.5 | 5.156 | 3.706 |
| The conditional expression (3) is that | Tbc/Fw | is more than or equal to 0.1 and less than or equal to 0.4 | 0.261 | 0.207 |
| The conditional formula (4) is more than or equal to 0.5 and less than or equal to 0.8 of absolute F1a/F1 | 0.656 | 0.615 |
| The conditional expression (5) is that (S2+ S3+ S4)/(Fw × Z) is not more than 0.5 and not more than 0.8 | 0.616 | 0.652 |
By the technical scheme provided by the invention, the lens system comprises a first lens group G1 with positive diopter, a second lens group G2 with negative diopter, a third lens group G3 with positive diopter and a fourth lens group G4 with positive diopter in sequence from the object side to the image surface side in example 1 and example 2;
when zooming from the wide-angle end to the telephoto end, the first lens group G1 is fixed, the second lens group G2 moves from the object side to the image plane side, the moving amount is S2, the third lens group G3 moves from the object side to the image plane side first, the third lens group G3 folds halfway to move from the image plane side to the object side, the total moving amount is S3, and the fourth lens group G4 moves from the image plane side to the object side; the first lens group G1 comprises three parts, namely a negative diopter front group G1a consisting of three negative lenses, a middle group G1b consisting of two positive lenses and a positive diopter rear group G1 c; when the object moves from infinity to close distance, the intermediate group G1b moves from the object side to the image plane side to achieve focusing. Because the focal length of each lens group is optimized and matched and the appointed moving track of each lens group is adopted, the lens group is less in quantity, the structure is simplified, the size is small, an expensive aspheric surface is removed, the processing difficulty is reduced, the low cost and the high performance are realized, and the zooming multiplying power is more than 3 times. The lens can be widely applied to the fields of digital camera lenses, video camera lenses, particularly movie lenses and the like.
The foregoing shows and describes the general principles, essential features, and inventive features of this invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (3)
1. A zoom lens, characterized in that: the zoom lens comprises a first lens group (G1) with positive diopter, a second lens group (G2) with negative diopter, a third lens group (G3) with positive diopter and a fourth lens group (G4) with positive diopter in sequence from the object side to the image surface side;
when zooming from a wide angle end to a telephoto end, the first lens group (G1) is fixed, the second lens group (G2) moves from the object side to the image surface side, the third lens group (G3) moves from the object side to the image surface side, the third lens group is folded halfway and moves from the image surface side to the object side, and the fourth lens group (G4) moves from the image surface side to the object side;
the first lens group (G1) comprises a negative diopter front group (G1a) consisting of three negative lenses, a middle group (G1b) consisting of two positive lenses and a positive diopter rear group (G1c), and when an object moves from an infinite distance to a short distance, the middle group (G1b) moves from the object side to the image side to realize focusing;
the zoom lens also satisfies the following conditional expression:
3≤WL/F1b≤7 (1)
2.5≤|F1c/F1b|≤6.5 (2)
0.1≤|Tbc/Fw|≤0.4 (3)
wherein,
WL: the optical total length of the zoom lens;
f1 b: a focal length of an intermediate group (G1b) of the first lens group (G1);
f1 c: a focal length of a rear group (G1c) of the first lens group (G1);
tbc: an air space of the middle group (G1b) and the rear group (G1c) in the first lens group (G1) in an infinite state;
fw: and an optical focal length at the wide-angle end in an infinite state.
2. A zoom lens according to claim 1, wherein said first lens group (G1) satisfies the following conditional expression:
0.5≤|F1a/F1|≤0.8 (4)
wherein,
f1 a: a focal length of a front group (G1a) of the first lens group (G1);
f1: a focal length of the first lens group (G1) in an infinite-distance state.
3. The zoom lens according to claim 1 or 2, wherein the third lens group (G3) is folded halfway while moving from a wide-angle end to a telephoto end and forms a U-shaped moving locus, and the following conditional expression is satisfied:
0.5≤(S2+S3+S4)/(Fw×Z)≤0.8 (5)
wherein,
s2: a total moving amount of the second lens group (G2) upon zooming from the wide-angle end to the telephoto end;
s3: a total moving amount of the third lens group (G3) upon zooming from the wide-angle end to the telephoto end;
s4: a total moving amount of the fourth lens group (G4) upon zooming from the wide-angle end to the telephoto end;
fw: an optical focal length at the wide-angle end in an infinite state;
z: zoom magnification.
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| CN201811623338.7A CN109856787B (en) | 2018-12-28 | 2018-12-28 | zoom lens |
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|---|---|---|---|
| CN201811623338.7A CN109856787B (en) | 2018-12-28 | 2018-12-28 | zoom lens |
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| CN109856787B CN109856787B (en) | 2023-10-20 |
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| CN111650734A (en) * | 2020-08-10 | 2020-09-11 | 嘉兴中润光学科技有限公司 | Large wide-angle camera device and zoom lens |
| CN113721352A (en) * | 2021-09-01 | 2021-11-30 | 安徽长庚光学科技有限公司 | Wide screen lens of microspur deformation and have its digital camera, video camera |
| JP7516132B2 (en) | 2020-06-29 | 2024-07-16 | キヤノン株式会社 | Zoom lens and imaging device |
| JP7536526B2 (en) | 2020-06-29 | 2024-08-20 | キヤノン株式会社 | Zoom lens and imaging device |
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