CN112051662A - Short-wave large-view-field lens for space - Google Patents
Short-wave large-view-field lens for space Download PDFInfo
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- CN112051662A CN112051662A CN202011127691.3A CN202011127691A CN112051662A CN 112051662 A CN112051662 A CN 112051662A CN 202011127691 A CN202011127691 A CN 202011127691A CN 112051662 A CN112051662 A CN 112051662A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/04—Reversed telephoto objectives
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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Abstract
The invention discloses a short wave large view field lens for space, which comprises: a rear mirror group and a rear mirror group coaxially arranged in sequence along the light incidence direction; the anti-telephoto group comprises a first negative lens and a second negative lens which are sequentially arranged; the rear lens group comprises a third positive lens, a fourth positive lens, a fifth positive lens, a sixth negative lens, a seventh positive lens and an eighth negative lens which are arranged in sequence. By implementing the invention, the anti-telephoto set and the rear lens set are arranged, wherein the anti-telephoto set can enable the main plane parameters of the lens to be moved backwards, so that light can be conveniently incident into the rear lens set. Meanwhile, the focal power and the material thermal expansion coefficient of each lens in the two lens groups are reasonably set, so that the lens can realize a large field angle, can realize image surface stability under the conditions of high temperature and low temperature of vacuum and normal pressure, meets the requirements of space miniaturization, large field of view and long-period monitoring, and can also be used for various imaging requirements on the ground.
Description
Technical Field
The invention relates to the technical field of optical design, in particular to a short-wave large-view-field lens for a space.
Background
Short wave infrared imaging systems are widely used in the field of industrial safety, especially in the fields of electric power and high temperature detection. However, in the space environment, the application is less because the manufacturing cost is high, but with the development of technology, the shortwave infrared imaging system is cheaper and cheaper, so the shortwave infrared imaging system is gradually used for monitoring the power system of the satellite platform aiming at the space station.
However, the current short-wave imaging cameras are limited in application and rarely have large-field-of-view low-distortion lenses due to cost problems, and the distortion of the lenses reaching the field angle of more than 60 degrees is more than 5%. Meanwhile, in the space station, due to the unique irradiation, temperature difference and air pressure environment, the imaging of the existing short-wave infrared imaging system in the space station is unstable, and the short-wave infrared imaging system cannot be used in the space environment for a long time.
Disclosure of Invention
In view of this, the embodiment of the present invention provides a short-wave large-field-of-view lens for a space, so as to solve the technical problems that an existing short-wave infrared imaging system has a small field angle and is unstable in imaging in the space.
The embodiment of the invention provides a short-wave large-view-field lens for a space, which comprises: a rear mirror group and a rear mirror group coaxially arranged in sequence along the light incidence direction; the anti-telephoto group comprises a first negative lens and a second negative lens which are sequentially arranged; the rear lens group comprises a third positive lens, a fourth positive lens, a fifth positive lens, a sixth negative lens, a seventh positive lens and an eighth negative lens which are arranged in sequence.
Further, the sixth negative lens and the seventh positive lens are combined into a cemented mirror.
Further, this space still includes with big visual field of shortwave camera lens: and the optical filter is arranged behind the rear lens group along the light incidence direction.
Further, this space still includes with big visual field of shortwave camera lens: and the diaphragm is arranged between the fifth positive lens and the sixth negative lens.
Further, the first negative lens focal length f1Satisfies the conditional expression: 80mm<|f1|<90 mm; the second negative lens focal length f2Satisfies the conditional expression: 12mm<|f2|<13 mm; the third positive lens focal length f3Satisfies the conditional expression: 20mm<|f3|<25 mm; the fourth positive lens focal length f4Satisfies the conditional expression: 400mm<|f4|<450 mm; the fifth positive lens focal length f5Satisfies the conditional expression: 25mm<|f5|<30 mm; focal length f of the cemented mirror6Satisfies the conditional expression: 15mm<|f6|<20 mm; the eighth negative lens focal length f8Satisfies the conditional expression: 300mm<|f8|<320mm。
Further, the material of the first negative lens is quartz glass, the thickness of the first negative lens is 3.5mm, and the clear aperture of the first negative lens is 28 mm.
Further, the second negative lens is an aspherical lens.
Further, the field angle of the space short-wave large-field-of-view lens is 78 degrees.
Further, the absolute value of the full-field distortion of the space short-wave large-field lens is larger than 0 and smaller than 5%.
Further, the F number of the space short-wave large-field-of-view lens is 3.
The technical scheme of the invention has the following advantages:
according to the short-wave large-view-field lens for the space, provided by the embodiment of the invention, the anti-telephoto group and the rear lens group are arranged, wherein the anti-telephoto group can enable parameters of a main plane of the lens to move backwards, so that light can be conveniently incident into the rear lens group. Meanwhile, the focal power and the material thermal expansion coefficient of each lens in the two lens groups are reasonably set, so that the lens can realize a large field angle, can realize image surface stability under the conditions of high temperature and low temperature of vacuum and normal pressure, meets the requirements of space miniaturization, large field of view and long-period monitoring, and can also be used for various imaging requirements on the ground.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic structural diagram of a short-wave large-field-of-view lens for a space according to an embodiment of the present invention;
FIG. 2(a) is a diagram illustrating an optical modulation transfer function of an optical system of a lens under normal temperature and pressure conditions according to an embodiment of the present invention;
FIG. 2(b) is a diagram illustrating an optical modulation transfer function of the optical system of the lens under vacuum at room temperature according to an embodiment of the present invention;
FIG. 2(c) is a diagram illustrating an optical modulation transfer function of an optical system of a lens under a vacuum-40 ℃ low temperature condition according to an embodiment of the present invention;
FIG. 2(d) is a diagram illustrating an optical modulation transfer function of an optical system of a lens under a vacuum condition of 60 ° and a high temperature condition according to an embodiment of the present invention;
FIG. 3 is a distortion curve of the optical system of the lens system according to the embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present 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.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The embodiment of the invention provides a short-wave large-view-field lens for a space, as shown in fig. 1, the short-wave large-view-field lens for the space comprises: a rear mirror group and a rear mirror group coaxially arranged in sequence along the light incidence direction; the anti-telephoto group comprises a first negative lens 1 and a second negative lens 2 which are sequentially arranged; the rear lens group comprises a third positive lens 3, a fourth positive lens 4, a fifth positive lens 5, a sixth negative lens 6, a seventh positive lens 7 and an eighth negative lens 8 which are arranged in sequence.
According to the short-wave large-view-field lens for the space, provided by the embodiment of the invention, the anti-telephoto group and the rear lens group are arranged, wherein the anti-telephoto group can enable parameters of a main plane of the lens to move backwards, so that light can be conveniently incident into the rear lens group. Meanwhile, the focal power and the material thermal expansion coefficient of each lens in the two lens groups are reasonably set, so that the lens can realize a large field angle, can realize image surface stability under the conditions of high temperature and low temperature of vacuum and normal pressure, meets the requirements of space miniaturization, large field of view and long-period monitoring, and can also be used for various imaging requirements on the ground.
As an optional implementation manner of the embodiment of the invention, the first negative lens 1 can be made of optical quartz glass with strong radiation resistance, the thickness of the first negative lens 1 is 3.5mm, and the clear aperture of the first negative lens 1 is 28 mm. In addition, other lenses in the short-wave large-view-field lens for the space can also select irradiation-resistant glass, so that the radiation resistance of the lens is improved, and the lens is suitable for working requirements under long-time space environment conditions.
As an alternative embodiment of the present invention, the second negative lens 2 may be an aspheric lens, and the sixth negative lens 6 and the seventh positive lens 7 are combined to form a cemented lens. The lens can realize the rapid contraction of the light path, and the size of the lens is greatly reduced. For the second negative lens 2, its aspherical surface formula satisfies formula (1),
wherein k is a quadratic coefficient and can be 0, c is a spherical coefficient and can be rootSetting according to the absolute value of the focal length of the second negative lens, A and B are aspheric 4-order and 6-order coefficients, and r is the aperture radius position. Meanwhile, the aspheric coefficient a is 3.6643 × 10-005，B＝2.4775×10-007。
As an optional implementation manner of the embodiment of the present invention, in the short-wave large-field lens for space use, as shown in fig. 1, the first negative lens 1 has a first surface convex to an object and a second surface convex to the object; the second negative lens 2 has a first surface convex to the object and a second surface convex to the object; the third positive lens 3 has a first surface convex to the object side and a second surface convex to the image side; the fourth positive lens 4 has a first surface convex to the image side and a second surface convex to the image side; the fifth positive lens 5 has a first surface convex to the object side and a second surface convex to the image side; the cemented mirror has a first surface convex to the object side and a second surface convex to the image side; the eighth negative lens 8 has a first surface convex to the image side and a second surface convex to the image side.
As an optional implementation manner of the embodiment of the invention, the first negative lens 1 has a focal length f1Satisfies the conditional expression: 80mm<|f1|<90 mm; focal length f of second negative lens 22Satisfies the conditional expression: 12mm<|f2|<13 mm; third positive lens 3 focal length f3Satisfies the conditional expression: 20mm<|f3|<25 mm; fourth positive lens 4 focal length f4Satisfies the conditional expression: 400mm<|f4|<450 mm; fifth positive lens 5 focal length f5Satisfies the conditional expression: 25mm<|f5|<30 mm; focal length f of cemented mirror6Satisfies the conditional expression: 15mm<|f6|<20 mm; focal length f of eighth negative lens 88Satisfies the conditional expression: 300mm<|f8|<320mm。
Specifically, since the focal power of the lens is the reciprocal of the focal length of the lens, the coefficient of thermal expansion of the lens is a property of the material, corresponding to which is the refractive index of the material, which can be indirectly obtained by defining the refractive index of the material. Therefore, the short-wave large-field-of-view lens for space provided by the embodiment of the invention can select the focal length of the material according to the conditional expression, and simultaneously select the corresponding refractive index of each lens through design, calculation and analysis according to actual requirements, so that the lens can realize image surface stability under the conditions of high and low temperature under vacuum and normal pressure.
As an alternative implementation manner of the embodiment of the present invention, the second negative lens 2 may be made of a material with high refractive index and low dispersion, such as heavy flint glass; the third positive lens 3 can be made of high-refractive-index and low-dispersion material, such as heavy flint glass; the fourth positive lens 4 can be made of crown conventional materials; the fifth positive lens 5 can be made of crown conventional materials; the sixth negative lens 6 and the seventh positive lens 7 can be made of high-refractivity low-dispersion materials such as heavy flint glass and crown conventional materials; the eighth negative lens 8 may be selected from a low index, high dispersion material, such as crown conventional materials.
According to the short-wave large-view-field lens for the space, provided by the embodiment of the invention, the second negative lens is set to be the aspherical lens, so that the small size and high imaging quality of the lens can be ensured. Meanwhile, the distance between the center of the rear surface of the eighth negative lens and the image plane can be set to be 3mm, and finally the maximum outer contour of the lens is phi 28 multiplied by 55 mm. Therefore, the short-wave large-view-field lens for the space provided by the embodiment of the invention has a compact structure and a small volume.
As an optional implementation manner of the embodiment of the present invention, as shown in fig. 1, the short-wave large-field-of-view lens for space further includes: and the optical filter 9 is arranged behind the rear lens group along the light incidence direction, and the optical filter 9 is arranged behind the rear lens group along the light incidence direction. When the lens is used in different application scenes, the light passing spectrum range of the optical filter can be adjusted according to requirements, so that the short-wave large-view-field lens for the space can realize good imaging in any spectrum band between the short-wave range of 900nm and 1700 nm.
As an optional implementation manner of the embodiment of the present invention, the short-wave large-field-of-view lens for space further includes: and the diaphragm is arranged between the fifth positive lens and the sixth negative lens. Specifically, the diaphragm is arranged in the middle of the rear mirror group, so that coma or astigmatism of the lens can be guaranteed to be minimum, and meanwhile, the whole size of the lens can be smaller.
According to the short-wave large-view-field lens for the space, provided by the embodiment of the invention, the edges and the central part of each lens in the lens can be set to be thicker in consideration of the application requirement of a complex environment in the space transportation process, so that the lens meets the required environmental mechanical requirement.
As an optional implementation manner of the embodiment of the present invention, the short-wave large-field-of-view lens for a space has a field angle of 78 °, a full-field distortion greater than 0 and less than 5%, and an F number of 3. Therefore, according to the short-wave large-field-of-view lens for space provided by the embodiment of the invention, through reasonably selecting each lens in the anti-telephoto group and the rear lens group, and simultaneously, reasonably setting relevant parameters of each lens, the field angle of the lens can reach 78 degrees, namely, compared with the existing lens, the lens can realize large-field-of-view monitoring; meanwhile, on the premise of a large field angle, the distortion of the full field is less than 5%, and the F number is 3. Therefore, the lens realizes large-field low-distortion imaging.
The short-wave large-field-of-view lens for the space provided by the embodiment of the invention can be used in a detector with the resolution of 640 multiplied by 512 and the pixel size of 15 mu m. Meanwhile, the short-wave large-view-field lens for the space can be downward compatible with a smaller target surface and a large-pixel detector.
According to the short-wave large-view-field lens for the space, provided by the embodiment of the invention, by setting the bending direction and the bending degree of each lens in the lens and setting the focal length of each lens according to the relational expression, the included angle between the chief ray of each view field and the detector is not more than 10 degrees, the energy reduction caused by the incident angle of the ray is not more than 94 percent, and the normalized illumination of the edge view field is 84.6 percent.
By setting the lenses in the space short-wave large-field-of-view lens according to the above embodiment, schematic diagrams representing the imaging effect of the lens can be obtained as shown in fig. 2 and 3.
As shown in fig. 2(a), the Modulation Transfer Function (MTF) is a relationship between Modulation degree and logarithm of lines per millimeter in an image, and is used to evaluate detail reduction capability of a scene. The modulation is the ratio of the difference between the maximum and minimum intensity and the sum of the maximum and minimum intensity. The MTF is the ratio of the modulation of the image to the modulation of the object and is a function of the spatial frequency, which is usually expressed in the form of 1 p/mm. The modulation transfer function can be used to characterize the optical system, with a higher MTF indicating a better imaging quality of the system.
Fig. 2(b) is an optical modulation transfer function of the lens under a normal temperature vacuum condition, fig. 2(c) is an optical modulation transfer function of the lens under a-40 ° low temperature vacuum condition, and fig. 2(d) is an optical modulation transfer function of the lens under a 60 ° low temperature vacuum condition, wherein an abscissa is a spatial modulation frequency and an ordinate is an optical modulation function. It can be seen that the short-wave large-field-of-view lens for space provided by the embodiment of the invention can maintain higher imaging quality under the conditions of normal temperature, normal pressure, vacuum at-40 degrees and vacuum at 60 degrees.
As shown in fig. 3, distortion is a distortion curve of the lens, and means that when an object is imaged by an optical system, different parts of the object have aberrations with different magnifications, and the similarity of the object image is deteriorated due to the distortion. In fig. 3, the abscissa is the optical distortion percentage and the ordinate is the optical system field angle. It can be seen that the distortion of the lens is less than 5%.
Although the present invention has been described in detail with respect to the exemplary embodiments and the advantages thereof, those skilled in the art will appreciate that various changes, substitutions and alterations can be made to the embodiments without departing from the spirit and scope of the invention as defined by the appended claims. For other examples, one of ordinary skill in the art will readily appreciate that the order of the process steps may be varied while maintaining the scope of the present invention.
Moreover, the scope of the present application is not intended to be limited to the particular embodiments of the process, machine, manufacture, composition of matter, means, methods and steps described in the specification. As one of ordinary skill in the art will readily appreciate from the disclosure of the present invention, processes, machines, manufacture, compositions of matter, means, methods, or steps, presently existing or later to be developed, that perform substantially the same function or achieve substantially the same result as the corresponding embodiments described herein may be utilized according to the present invention. Accordingly, the appended claims are intended to include within their scope such processes, machines, manufacture, compositions of matter, means, methods, or steps.
Claims (10)
1. The utility model provides a space is with big visual field lens of shortwave, its characterized in that includes: a rear mirror group and a rear mirror group coaxially arranged in sequence along the light incidence direction;
the anti-telephoto group comprises a first negative lens and a second negative lens which are sequentially arranged;
the rear lens group comprises a third positive lens, a fourth positive lens, a fifth positive lens, a sixth negative lens, a seventh positive lens and an eighth negative lens which are arranged in sequence.
2. The spatially short-wave large-field lens according to claim 1, wherein the sixth negative lens and the seventh positive lens are combined into a cemented mirror.
3. The spatially short-wave large field-of-view lens according to claim 1, further comprising: and the optical filter is arranged behind the rear lens group along the light incidence direction.
4. The spatially short-wave large field-of-view lens according to claim 1, further comprising: and the diaphragm is arranged between the fifth positive lens and the sixth negative lens.
5. The spatially short-wave large field-of-view lens of claim 2,
the first negative lens focal length f1Satisfies the conditional expression: 80mm < | f1|＜90mm；
The second negative lens focal length f2Satisfies the conditional expression: 12mm < | f2|＜13mm；
The third positive lens focal length f3Satisfies the conditional expression: 20mm < | f3|＜25mm；
The fourth positive lens focal length f4Satisfies the conditional expression: 400mm < | f4|＜450mm；
The fifth positive lens focal length f5Satisfies the conditional expression: 25mm < | f5|＜30mm；
Focal length f of the cemented mirror6Satisfies the conditional expression: 15mm < | f6|＜20mm；
The eighth negative lens focal length f8Satisfies the conditional expression: 300mm < | f8|＜320mm。
6. The space short-wave large-field lens according to claim 1, wherein the material of the first negative lens is quartz glass, the thickness of the first negative lens is 3.5mm, and the clear aperture of the first negative lens is 28 mm.
7. The spatially short-wave large field of view lens of claim 1, wherein the second negative lens is an aspheric lens.
8. The short-wave large field lens for space of any one of claims 1 to 7, wherein the field angle of the short-wave large field lens for space is 78 °.
9. The spatially short wave large field of view lens according to any one of claims 1 to 7, wherein the absolute value of the full field distortion of the spatially short wave large field of view lens is greater than 0 and less than 5%.
10. The spatially short wave large field of view lens of any one of claims 1 to 7, wherein the F-number of the spatially short wave large field of view lens is 3.
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| CN2020106940586 | 2020-07-17 | ||
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112987259A (en) * | 2021-03-31 | 2021-06-18 | 江西晶超光学有限公司 | Optical system, image capturing module and electronic equipment |
| WO2022133651A1 (en) * | 2020-12-21 | 2022-06-30 | 欧菲光集团股份有限公司 | Optical system, photographing module, and electronic device |
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2020
- 2020-10-20 CN CN202011127691.3A patent/CN112051662A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022133651A1 (en) * | 2020-12-21 | 2022-06-30 | 欧菲光集团股份有限公司 | Optical system, photographing module, and electronic device |
| CN112987259A (en) * | 2021-03-31 | 2021-06-18 | 江西晶超光学有限公司 | Optical system, image capturing module and electronic equipment |
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