CN111435191B - Zoom lens, camera and monitoring equipment - Google Patents
Zoom lens, camera and monitoring equipment Download PDFInfo
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- CN111435191B CN111435191B CN201910032055.3A CN201910032055A CN111435191B CN 111435191 B CN111435191 B CN 111435191B CN 201910032055 A CN201910032055 A CN 201910032055A CN 111435191 B CN111435191 B CN 111435191B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/163—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
- G02B15/167—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses
- G02B15/173—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses arranged +-+
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Abstract
The invention discloses a zoom lens, comprising: the shell is provided with a photosensitive chip; the first lens group, the second lens group, set up between first lens group and sensitization chip movably; the third lens group is fixed between the second lens group and the photosensitive chip; and a fourth lens group movably disposed between the third lens group and the photosensitive chip; the diaphragm is fixed between the second lens group and the third lens group; the focal length of the first lens group is positive, the focal length of the second lens group is negative, the focal length of the third lens group is positive, and the focal length of the fourth lens group is positive. The aperture can be constant from the wide-angle end and the telephoto end, and the image effect at the telephoto end can be effectively improved.
Description
Technical Field
The invention relates to the technical field of lenses, in particular to a zoom lens, a camera and monitoring equipment.
Background
In the zoom lens in the current market, the aperture from the wide-angle end to the telephoto end is mostly gradually reduced, so that the performance of the whole focal length section under low illumination cannot be well ensured; the photosensitive chip used by the zoom lens is relatively small, the pixel point of the photosensitive chip is small, and especially in a low-light environment, the image effect shot by the zoom lens is poor.
Disclosure of Invention
The embodiment of the invention provides a zoom lens, which is used for solving the problem that in the prior art, the aperture from a wide-angle end to a telephoto end is gradually reduced, so that the image shot at the telephoto end has a poor effect.
The embodiment of the invention adopts the following technical scheme:
the zoom lens of the present invention includes:
the shell is provided with a photosensitive chip;
the first lens group is fixed on one side of the light sensing surface of the light sensing chip;
the second lens group is movably arranged between the first lens group and the photosensitive chip and realizes the change of the focal length and the multiplying power of the zoom lens at a wide-angle end and a telephoto end;
the third lens group is fixed between the second lens group and the photosensitive chip and used for correcting coma aberration, spherical aberration and chromatic aberration of the zoom lens; and
a fourth lens group movably disposed between the third lens group and the photosensitive chip to allow an image to fall on the photosensitive chip,
wherein, the pixel ratio of the coma aberration to the zoom lens, the pixel ratio of the spherical aberration to the zoom lens, and the pixel ratio of the chromatic aberration to the zoom lens are all less than 2.
Optionally, a distance between the first lens group and the photosensitive chip is less than 165mm, a focal length of the first lens group is positive, a focal length of the second lens group is negative, a focal length of the fourth lens group is positive and is located between 15 mm and 40mm, and a focal length of the third lens group is positive and is located between 13 mm and 30 mm.
Optionally, the zoom lens further includes an aperture stop with a constant aperture size, and the aperture stop is fixed between the second lens group and the third lens group.
Optionally, the aperture F # of the aperture stop is F1.6.
Optionally, the third lens group includes three lenses arranged in sequence towards the photosensitive chip, wherein, in the third lens group, the focal lengths of the lenses close to the photosensitive chip are both negative, and the focal lengths of the rest lenses are positive.
Optionally, the fourth lens group includes four lenses arranged in sequence in the direction of the photosensitive chip, wherein in the fourth lens group, in the direction of the photosensitive chip, the focal lengths of the lenses are negative, positive, negative and positive in sequence.
Optionally, the first lens group and the second lens group are respectively provided with three lenses.
Optionally, a cemented lens is disposed in the first lens group and the fourth lens group.
Optionally, the zoom lens further includes plane transparent glass disposed between the fourth lens group and the photosensitive chip.
Optionally, the lenses of each lens group are spherical lenses.
The camera of the present invention includes the zoom lens.
The monitoring device of the present invention includes the zoom lens described above.
The embodiment of the invention adopts at least one technical scheme which can achieve the following beneficial effects:
when the pixel ratio of the coma aberration to the zoom lens, the pixel ratio of the spherical aberration to the zoom lens and the pixel ratio of the chromatic aberration to the zoom lens are all smaller than 2, the size of the aperture does not need to be adjusted, and the aberration of the zoom lens at the wide-angle end and the telephoto end can meet the requirements. Therefore, the aperture size at the telephoto end can be the same as the aperture size at the wide-angle end, the aperture is always constant, and the image effect at the telephoto end can be effectively improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic view of a state structure of a zoom lens according to an embodiment of the present invention at a wide-angle end;
fig. 2 is a schematic view of a state structure of a zoom lens according to an embodiment of the present invention, in a process of changing from a wide-angle end to a telephoto end;
FIG. 3 is a schematic view of a zoom lens according to an embodiment of the present invention at a telephoto end;
FIG. 4 is a schematic diagram of equivalent optical surfaces of lens groups provided by an embodiment of the present invention;
FIG. 5 is a table of parameters for each lens according to an embodiment of the present invention.
Wherein the following reference numerals are included in figures 1-5:
a first lens group-1; a second lens group-2; a third lens group-3; a fourth lens group-4; a photosensitive chip-5; a diaphragm-6; planar transparent glass-7; a first lens-11; a second lens-12; a third lens-13; a fourth lens-21; a fifth lens-22; a sixth lens-23; a seventh lens-31; an eighth lens-32; a ninth lens-33; a tenth lens-41; an eleventh lens-42; a twelfth lens-43; a thirteenth lens-44; optical surface-A; optical surface-B; optical surface-C; optical surface-D.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 3, the zoom lens of the present invention includes a housing and a photosensitive chip 5, a first lens group 1, a second lens group 2, a third lens group 3, and a fourth lens group 4, which are respectively disposed in the housing. The first lens group 1 is fixed on one side of the light sensing surface of the light sensing chip 5. The second lens group 2 is movably disposed between the first lens group 1 and the photosensitive chip 5, enabling variation in focal length and magnification of the zoom lens at the wide-angle end and the telephoto end. The third lens assembly 3 is fixed between the second lens assembly 2 and the photosensitive chip 5, and corrects the coma aberration, spherical aberration and chromatic aberration of the zoom lens. The fourth lens group 4 is movably disposed between the third lens group 3 and the photosensitive chip 5. The second lens group 2 gradually gets close to the diaphragm 6 in the process of changing from the wide-angle end to the telephoto end, and the fourth lens group 4 enables an imaging surface to fall on the photosensitive chip 5 according to the movement of the second lens group 2 and the change of the object distance. And each lens group is arranged along the optical axis.
By arranging the lens group, the pixel ratio of the coma aberration to the zoom lens, the pixel ratio of the spherical aberration to the zoom lens and the pixel ratio of the chromatic aberration to the zoom lens are all smaller than 2. Thus, the aberration of the zoom lens at the wide-angle end and the telephoto end can be made to meet the requirements without adjusting the size of the aperture. Therefore, the aperture size at the telephoto end can be the same as that at the wide-angle end, the aperture is always constant, the aperture F # can even be F1.6, and the image effect at the telephoto end can be effectively improved.
It should be noted that coma is the same as what is commonly referred to as coma. After the monochromatic conical light beam emitted to the optical system by a certain off-axis object point outside the main axis is refracted by the optical system, if the monochromatic conical light beam cannot be condensed into a clear point at an ideal plane, but is condensed into a comet-shaped light spot trailing a bright tail, the imaging error of the formed optical system is called coma aberration.
The spherical aberration is the same as what is commonly referred to as spherical aberration. Spherical aberration (Spherical aberration) is also known as Spherical aberration. After light beams emitted by an object point on the axis pass through the optical system, light rays with different angles from the optical axis intersect the optical axis at different positions, and therefore a circular diffuse spot is formed on an image surface, namely spherical aberration. Spherical aberration is generally measured as the axial distance of the intersection of the image side of the actual ray with the optical axis relative to the intersection of the paraxial ray with the optical axis (i.e., a gaussian image point).
The color difference is the same as what is commonly referred to as a color difference. The chromatic aberration is also called chromatic aberration, which is a serious defect of lens imaging, and the chromatic aberration is simply the difference of colors and occurs in the case of using polychromatic light as a light source.
The pixels are the same as the pixels generally referred to. A pixel is a size unit of resolution.
The following describes the structure of each component in detail by taking a specific embodiment as an example.
In this embodiment, the distance between the first lens group 1 and the photosensitive chip 5 is less than 165mm, and the focal length of the first lens group 1 is positive. The focal length of the second lens group 2 is negative. The focal length of the third lens group 3 is positive and lies between 13-30 mm. The focal length of the fourth lens group 4 is positive and lies between 15-40 mm. As shown in fig. 4, the first lens group 1 is equivalent to an optical surface a, the second lens group 2 is equivalent to an optical surface B, the third lens group 3 is equivalent to an optical surface C, and the fourth lens group 4 is equivalent to an optical surface D. With this arrangement, the length of the zoom lens is short, and the zoom lens can be applied to, for example, a video camera or a monitoring apparatus.
More specifically, the first lens group 1 includes a first lens 11, a second lens 12, and a third lens 13 sequentially arranged toward the photosensitive chip 5, the first lens 11 is a meniscus spherical lens with a negative focal length and a concave surface facing the photosensitive chip 5, the second lens 12 and the third lens 13 are spherical lenses with a positive focal length, and the first lens 11 and the second lens 12 are bonded together to form a cemented lens. Each lens of the first lens group 1 is a glass spherical lens.
The second lens group 2 includes a fourth lens 21, a fifth lens 22, and a sixth lens 23, which are arranged in this order toward the photosensitive chip 5. The fourth lens 21 is a meniscus spherical lens with a negative focal length, the fifth lens 22 is a biconcave spherical lens with a negative focal length, and the sixth lens 23 is a biconvex spherical lens with a positive focal length. Each lens of the second lens group 2 is a glass spherical lens. The moving range of the second lens group 2 is 0 to 38.9mm.
The third lens group 3 includes a seventh lens 31, an eighth lens 32, and a ninth lens 33, which are sequentially disposed toward the photosensitive chip 5, where the seventh lens 31 is a biconvex spherical lens with a positive focal length, the eighth lens 32 is a meniscus spherical lens with a positive focal length, and the ninth lens 33 is a biconcave spherical lens with a negative focal length. Each lens of the third lens group 3 is a glass spherical lens. The distance between the third lens group 3 and the first lens group 1 is 85.58mm.
The fourth lens group 4 includes a tenth lens 41, an eleventh lens 42, a twelfth lens 43, and a thirteenth lens 44, which are sequentially disposed toward the photosensitive chip 5, where the tenth lens 41 is a meniscus spherical lens with a negative focal length, the eleventh lens 42 is a double convex spherical lens with a positive focal length, the twelfth lens 43 is a double convex spherical lens with a positive focal length, and the thirteenth lens 44 is a double concave spherical lens with a negative focal length. Each lens in the fourth lens group 4 is a glass spherical lens. The moving range of the fourth lens group is 0-2.44 mm.
A stop 6 is fixed between the second lens group 2 and the third lens group 3. The aperture F # of the diaphragm 6 is F1.6. The distance between the diaphragm 6 and the photosensitive chip 5 is 77.34mm. When the optical system works under different focal lengths and environments, the aperture size of the diaphragm 6 is unchanged, namely, the aperture is constant in the whole application process.
And a plane light-transmitting glass 7 is arranged between the fourth lens group 4 and the photosensitive chip 5, and the photosensitive chip 5 is protected by the plane light-transmitting glass 7.
The specific parameters of each optical element are shown in fig. 5. In fig. 5, the reference numerals in the object plane correspond to those in fig. 1 to 3, and the left side refers to the side away from the photosensitive chip 5, and the right side refers to the side close to the photosensitive chip 5. For example, the left side of the object plane 11 refers to the side of the first lens 11 away from the photosensitive chip 5; the right side of the object plane 11 is a side of the first lens 11 close to the photosensitive chip 5.
In the zoom lens, the second lens group 2 moves back and forth, the focal length of the zoom lens is changed, and the fourth lens group 4 can also move back and forth for focusing, so that the focal length of the zoom lens can be changed between 20mm and 70mm to achieve 3.5 times of zooming, and the shooting angle level is changed between 54 degrees and 15 degrees.
In the zoom lens, the resolution higher than 8M (800 ten thousand pixels) can be achieved, taking a 4/3' CCD (Charge-coupled Device) with a diagonal size of 21.63mm as an example, the zoom lens can achieve the central resolution higher than 100lp/mm and the peripheral 0.9H (90% diagonal position) resolution higher than 70lp/mm.
The zoom lens realizes that the aperture diameter is constant from the short focal end (wide-angle end) to the telephoto end, and the F number of the aperture is constant to 1.6.
The zoom lens uses thirteen glass spherical lenses, so that compared with a system utilizing an aspheric surface, the cost is greatly reduced, and meanwhile, various aberrations are well corrected, so that the zoom lens has good quality.
The zoom lens has a wide shooting distance range, the shooting distance can be as short as 1m at the wide-angle end, and the shooting distance can be as short as 3m at the telephoto end, so that the zoom lens is suitable for being used in various environments.
The camera and the monitoring apparatus of the present invention each include the zoom lens described above. In the camera or the monitoring apparatus, it is not necessary to adjust the size of the aperture, and the aberrations of the zoom lens at the wide-angle end and the telephoto end can be made to meet requirements. Therefore, the aperture size at the telephoto end can be the same as that at the wide-angle end, the aperture is always constant, the aperture F # can even be F1.6, and the image effect at the telephoto end can be effectively improved.
The above description is only an example of the present invention, and is not intended to limit the present invention. Various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (8)
1. A zoom lens, comprising:
the shell is provided with a photosensitive chip;
four groups of lenses, wherein,
the first lens group is fixed on one side of the photosensitive surface of the photosensitive chip, and the number of the lenses of the first lens group is three;
the second lens group is movably arranged between the first lens group and the photosensitive chip and used for changing the focal length and the magnification of the zoom lens at a wide-angle end and a telephoto end, and the number of lenses of the second lens group is three;
the third lens group is fixed between the second lens group and the photosensitive chip and used for correcting coma, spherical aberration and chromatic aberration of the zoom lens, the number of the lenses of the third lens group is three, and the three lenses of the third lens group are sequentially arranged towards the photosensitive chip, wherein the focal lengths of the lenses close to the photosensitive chip in the third lens group are negative, and the focal lengths of the rest lenses are positive;
the fourth lens group is movably arranged between the third lens group and the photosensitive chip to enable the image to fall on the photosensitive chip, wherein the number of the lenses of the fourth lens group is four, and the four lenses of the fourth lens group are sequentially arranged towards the photosensitive chip; and
an aperture stop having a constant aperture size, the aperture stop being fixed between the second lens group and the third lens group;
wherein the pixel ratio of the coma aberration to the zoom lens, the pixel ratio of the spherical aberration to the zoom lens, and the pixel ratio of the chromatic aberration to the zoom lens are all less than 2;
the distance between the first lens group and the photosensitive chip is less than 165mm, the focal length of the first lens group is positive, the focal length of the second lens group is negative, the focal length of the fourth lens group is positive and is located between 15 mm and 40mm, and the focal length of the third lens group is positive and is located between 13 mm and 30 mm.
2. The zoom lens according to claim 1, wherein an aperture F # of the aperture stop is F1.6.
3. The zoom lens according to claim 1, wherein in the fourth lens group, toward the photosensitive chip, focal lengths of the four lenses are negative, positive, negative and positive in sequence.
4. The zoom lens according to claim 1, wherein a cemented lens is provided in the first lens group and the fourth lens group.
5. The zoom lens according to claim 4, further comprising a flat light-transmitting glass disposed between the fourth lens group and the photosensitive chip.
6. The zoom lens according to any one of claims 1 to 5, wherein the lens of each lens group is a spherical lens.
7. A camera characterized by comprising the zoom lens according to any one of claims 1 to 6.
8. A monitoring device characterized by comprising the zoom lens according to any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910032055.3A CN111435191B (en) | 2019-01-14 | 2019-01-14 | Zoom lens, camera and monitoring equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910032055.3A CN111435191B (en) | 2019-01-14 | 2019-01-14 | Zoom lens, camera and monitoring equipment |
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| CN111435191A CN111435191A (en) | 2020-07-21 |
| CN111435191B true CN111435191B (en) | 2022-10-14 |
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| Publication number | Publication date |
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| CN111435191A (en) | 2020-07-21 |
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