A long focal length and large aperture surveillance lens

Abstract

The present invention discloses a long-focus large-aperture surveillance lens, which comprises a convex-concave positive lens L1, a convex-concave positive lens L2, a double-convex positive lens L3, a double-concave negative lens L4, a convex-concave negative lens L5, a convex-concave positive lens L6, a convex-concave positive lens L7, a double-concave negative lens L8 and a convex-concave positive lens L9 arranged in sequence along the light incident direction, wherein: the double-convex positive lens L3 and the double-concave negative lens L4 form a first cemented group; the convex-concave negative lens L5 and the convex-concave positive lens L6 form a second cemented group; the convex-concave positive lens L7 and the double-concave negative lens L8 form a third cemented group; the long-focus large-aperture surveillance lens also satisfies the following conditions: TTL / f < 1, 1.5 < f1 / f < 2.5, 0.7 < f2 / f < 1.3. The surveillance lens of the present application satisfies large aperture, miniaturization and light weight, and the focal plane does not shift within the range of -40°C to 80°C, with high resolution, day-night co-focus and long surveillance distance.

Description

Technical Field

[0001] The present invention belongs to the field of optical lenses, and particularly relates to a long focal length and large aperture surveillance lens. Background Art

[0002] Due to the long focal length of telephoto lenses, in order not to make the aperture too large, generally their apertures are relatively small. However, in recent years, higher specifications have been put forward for the telephoto lenses used on equipment, requiring a larger light transmission amount and better image quality, that is, it is necessary to increase the aperture and increase the effective diameter of the axial beam passing through the lens group. Once the effective diameter of the lens group increases, its weight increases, and the larger the aperture, the more obvious the spherical aberration, and it is more difficult to ensure high imaging performance. Summary of the Invention

[0003] The purpose of the present invention is to address the above problems by providing a long focal length and large aperture surveillance lens. By reasonably distributing the optical power and diaphragm position of each lens group, the aperture is increased, and the lens is miniaturized and lightened. At the same time, it adapts to the circuit heating and low temperature environment of the external camera, and can ensure that the focal plane does not shift within -40°C to 80°C, with high resolution, day and night confocal and long surveillance distance.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0005] A long focal length and large aperture surveillance lens proposed by the present invention includes a convex-concave positive lens L1, a convex-concave positive lens L2, a biconvex positive lens L3, a biconcave negative lens L4, a convex-concave negative lens L5, a convex-concave positive lens L6, a convex-concave positive lens L7, a biconcave negative lens L8, and a convex-concave positive lens L9 arranged in sequence along the light incident direction, where:

[0006] The biconvex positive lens L3 and the biconcave negative lens L4 form a first cemented group;

[0007] The convex-concave negative lens L5 and the convex-concave positive lens L6 form a second cemented group;

[0008] The convex-concave positive lens L7 and the biconcave negative lens L8 form a third cemented group;

[0009] The long focal length and large aperture surveillance lens also satisfies the following conditions:

[0010] TTL / f < 1, 1.5 < f1 / f < 2.5, 0.7 < f2 / f < 1.3

[0011] Wherein, TTL is the total length of the lens, f is the effective focal length of the lens, f1 is the focal length of the convex-concave positive lens L1, and f2 is the focal length of the convex-concave positive lens L2.

[0012] Preferably, a diaphragm is provided on the object surface side of the convex-concave positive lens L2.

[0013] Preferably, the convex-concave positive lens L1 is a glass lens with a refractive index greater than 1.95.

[0014] Preferably, the convex-concave positive lens L2 is a glass lens with an Abbe number greater than 90.

[0015] Preferably, both the second cemented group and the third cemented group have negative focal lengths.

[0016] Preferably, the operating wavelength band of the long focal length and large aperture surveillance lens is visible light of 435 - 656 nm or near-infrared light below 850 nm.

[0017] Preferably, a filter is also provided on the image side of the convex-concave positive lens L9.

[0018] Preferably, the biconvex positive lens L3 is made of heavy phosphate crown glass.

[0019] Preferably, each lens is a spherical lens.

[0020] Preferably, for the convex-concave positive lens L1, the convex-concave positive lens L2, the biconvex positive lens L3, the biconcave negative lens L4, the convex-concave negative lens L5, the convex-concave positive lens L6, the convex-concave positive lens L7, the biconcave negative lens L8, and the convex-concave positive lens L9, the corresponding focal length value ranges are respectively 100(1 ± 5%), 50(1 ± 5%), 28(1 ± 5%), -29(1 ± 5%), -12(1 ± 5%), 14(1 ± 5%), 15(1 ± 5%), -7(1 ± 5%), and 26(1 ± 5%); the corresponding refractive index value ranges are respectively 2(1 ± 5%), 1.45(1 ± 5%), 1.6(1 ± 5%), 1.8(1 ± 5%), 1.85(1 ± 5%), 1.6(1 ± 5%), 1.9(1 ± 5%), 1.8(1 ± 5%), and 1.6(1 ± 5%); the corresponding object-side curvature radius value ranges are respectively 44(1 ± 5%), 20(1 ± 5%), 19(1 ± 5%), -100(1 ± 5%), 42(1 ± 5%), 8(1 ± 5%), -270(1 ± 5%), -14(1 ± 5%), and 14(1 ± 5%); the corresponding image-side curvature radius value ranges are respectively 75(1 ± 5%), 170(1 ± 5%), -100(1 ± 5%), 33(1 ± 5%), 8(1 ± 5%), 135(1 ± 5%), -14(1 ± 5%), 10(1 ± 5%), and 200(1 ± 5%), where "-" indicates that the mirror surface bends towards the image side.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] 1) Adopt a nine-piece lens. By reasonably distributing the optical power and diaphragm position of each lens group, the aperture is increased, and the lens is miniaturized and lightened. At the same time, it can adapt to the circuit heating and low-temperature environment of the external camera, and the focal plane does not shift within the range of -40°C to 80°C;

[0023] 2) Adopt multiple cemented groups, which is beneficial to reducing chromatic aberration, lowering assembly and tolerance requirements, improving imaging quality, and reducing costs;

[0024] 3) Select materials with low dispersion and anomalous relative partial dispersion to correct visible light and near-infrared chromatic aberration, achieving day and night use with high resolution;

[0025] 4) It can achieve precise monitoring of large-range images at higher and farther positions, and is suitable for video monitoring means for large scenes and close-up shooting of specific targets. It can be applied to urban fire monitoring, urban key target monitoring, urban public security monitoring, airport perimeter security monitoring, factory area monitoring, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic structural diagram of the present invention;

[0027] Figure 2 is the MTF curve diagram of Embodiment 1 of the present invention under the environment of normal temperature 20°C;

[0028] Figure 3 is the defocus curve diagram of Embodiment 1 of the present invention under the environment of normal temperature 20°C;

[0029] Figure 4 is the defocus curve diagram of Embodiment 1 of the present invention under the low-temperature environment of -40°C;

[0030] Figure 5 is the defocus curve diagram of Embodiment 1 of the present invention under the high-temperature environment of 80°C;

[0031] Figure 6 is the MTF curve diagram of Embodiment 1 of the present invention in near-infrared light;

[0032] Figure 7 is the MTF curve diagram of Embodiment 2 of the present invention under the environment of normal temperature 20°C;

[0033] Figure 8 is the defocus curve diagram of Embodiment 2 of the present invention under the environment of normal temperature 20°C;

[0034] Figure 9 is the defocus curve diagram of Embodiment 2 of the present invention under the low-temperature environment of -40°C;

[0035] Figure 10 is the defocus curve diagram of Embodiment 2 of the present invention under the high-temperature environment of 80°C;

[0036] Figure 11 It is the MTF curve graph of the second embodiment of the present invention under near-infrared light. Specific embodiments

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without making creative efforts belong to the scope of protection of the present application.

[0038] It should be noted that unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs. The terms used in the description of the present application herein are only for the purpose of describing specific embodiments and are not intended to limit the present application.

[0039] Embodiment 1:

[0040] As Figures 1-6 shown, a long focal length and large aperture surveillance lens includes a convex-concave positive lens L1, a convex-concave positive lens L2, a biconvex positive lens L3, a biconcave negative lens L4, a convex-concave negative lens L5, a convex-concave positive lens L6, a convex-concave positive lens L7, a biconcave negative lens L8, and a convex-concave positive lens L9 arranged in sequence along the light incident direction, where:

[0041] The biconvex positive lens L3 and the biconcave negative lens L4 form a first cemented group;

[0042] The convex-concave negative lens L5 and the convex-concave positive lens L6 form a second cemented group;

[0043] The convex-concave positive lens L7 and the biconcave negative lens L8 form a third cemented group;

[0044] The long focal length and large aperture surveillance lens also satisfies the following conditions:

[0045] TTL / f < 1, 1.5 < f1 / f < 2.5, 0.7 < f2 / f < 1.3

[0046] where TTL is the total length of the lens, f is the effective focal length of the lens, f1 is the focal length of the convex-concave positive lens L1, and f2 is the focal length of the convex-concave positive lens L2.

[0047] Among them, the monitoring lens is composed of nine lenses distributed in sequence along the light incident direction. By reasonably distributing the optical power of each lens, under the conditions of TTL / f < 1, 1.5 < f1 / f < 2.5, and 0.7 < f2 / f < 1.3, while satisfying clear imaging, the aperture is increased, the light passing aperture is large, and it has a larger light passing amount and better image quality. Multiple cemented groups are adopted, and each cemented group is bonded with photosensitive glue, such as UV glue, to correct the chromatic aberration of light with different wavelengths. The dispersion of each type of lens can be compensated, so that the comprehensive chromatic aberration is reduced to the lowest, and the assembly and tolerance requirements are reduced. The focus drift amount of the lens in the visible light and near-infrared light bands is greatly reduced, realizing day and night confocal, improving the imaging clarity and color authenticity, reducing costs, and no longer requiring re-focusing for near-infrared imaging at night. At the same time, each lens can also select materials with low dispersion and anomalous relative partial dispersion to further correct the chromatic aberration of visible light and near-infrared light. And various aberrations mainly spherical aberration generated along with focusing are corrected, so as to achieve good optical performance. At the same time, by reasonably distributing the positive and negative focal length values of each lens, and by selecting appropriate glass materials, an athermal design can be achieved, solving the optimization balance problem between high and low temperature focus drift and normal temperature resolution. It does not defocus at high and low temperatures, adapts to the circuit heating of the external camera and low temperature environment, and is applicable to a temperature environment of -40° to 80°, with high imaging quality and resolution. It can achieve precise monitoring of large-range images at higher and farther positions, is applicable to video monitoring of large scenes and close-ups of specific targets, and can be applied to urban fire monitoring, urban key target monitoring, urban public security monitoring, airport perimeter security monitoring, factory area monitoring, etc.

[0048] In one embodiment, a diaphragm is provided on the object surface side of the convex-concave positive lens L2.

[0049] Among them, a diaphragm is provided on the object surface side of the convex-concave positive lens L2. Placing the diaphragm in front helps to reduce the lens aperture and achieve miniaturization and light weight. The diaphragm can be set between the convex-concave positive lens L1 and the convex-concave positive lens L2 or on the object surface side of the convex-concave positive lens L1.

[0050] In one embodiment, the convex-concave positive lens L1 is a glass lens with a refractive index greater than 1.95.

[0051] Among them, the convex-concave positive lens L1 is selected as a glass lens with a refractive index greater than 1.95, which can correct the spherical aberration brought by the telephoto lens and improve the imaging quality.

[0052] In one embodiment, the convex-concave positive lens L2 is a glass lens with an Abbe number greater than 90.

[0053] Among them, the convex-concave positive lens L2 is selected as a glass lens with an Abbe number greater than 90, which reduces the chromatic aberration of the lens, improves the image quality, and this type of material is beneficial to the athermal design of the lens.

[0054] In one embodiment, both the second cemented group and the third cemented group have negative focal lengths.

[0055] Among them, the convex-concave negative lens L5 and the convex-concave positive lens L6 form the second cemented group, and the convex-concave positive lens L7 and the double-concave negative lens L8 form the third cemented group, both of which have negative focal lengths, which is beneficial to balancing aberration and improving imaging quality.

[0056] In one embodiment, the working wavelength band of the long focal length and large aperture surveillance lens is visible light of 435-656 nm or near-infrared light below 850 nm.

[0057] Among them, the surveillance lens can achieve clear imaging for visible light with wavelengths of 435 nm to 656 nm or near-infrared light below 850 nm.

[0058] In one embodiment, a filter is further provided on the image plane side of the convex-concave positive lens L9.

[0059] Among them, the filter is placed on the image plane side of the convex-concave positive lens L9. During the day, it participates in the optical path imaging, filters out near-infrared light, and is used to reduce photoelectric noise. At night, it allows near-infrared light to participate in imaging, enhances the photosensitive brightness, improves the imaging quality, and can achieve day and night confocal imaging.

[0060] In one embodiment, the double-convex positive lens L3 is made of heavy phosphate crown glass.

[0061] Among them, the double-convex positive lens L3 is selected to be made of heavy phosphate crown glass to correct chromatic aberration and improve imaging quality. The convex-concave positive lens L2 can also be selected to be made of heavy phosphate crown glass. In addition, at least one of the convex-concave positive lens L2 and the double-convex positive lens L3 can also be made of other materials with anomalous relative partial dispersion to correct visible light and near-infrared chromatic aberration.

[0062] In one embodiment, each lens is a spherical lens.

[0063] Among them, each lens is a spherical lens, which has low processing and assembly costs, is wear-resistant, and is suitable for mass production.

[0064] In one embodiment, the convex-concave positive lens L1, convex-concave positive lens L2, biconvex positive lens L3, biconcave negative lens L4, convex-concave negative lens L5, convex-concave positive lens L6, convex-concave positive lens L7, biconcave negative lens L8, and convex-concave positive lens L9 have corresponding focal length value ranges of 100(1±5%), 50(1±5%), 28(1±5%), -29(1±5%), -12(1±5%), 14(1±5%), 15(1±5%), -7(1±5%), and 26(1±5%) respectively; the corresponding refractive index value ranges are 2(1±5%), 1.45(1±5%), 1.6(1±5%), 1.8(1±5%), 1.85(1±5%), 1.6(1±5%), 1.9(1±5%), 1.8(1±5%), and 1.6(1±5%) respectively; the corresponding object-side curvature radius value ranges are 44(1±5%), 20(1±5%), 19(1±5%), -100(1±5%), 42(1±5%), 8(1±5%), -270(1±5%), -14(1±5%), and 14(1±5%) respectively; the corresponding image-side curvature radius value ranges are 75(1±5%), 170(1±5%), -100(1±5%), 33(1±5%), 8(1±5%), 135(1±5%), -14(1±5%), 10(1±5%), and 200(1±5%) respectively, where "-" indicates that the mirror surface direction bends towards the image plane side.

[0065] Among them, when the focal length, refractive index, and curvature radius of each lens take values within the above ranges, the aperture is increased, which helps to achieve miniaturization, light weight, and clear imaging of the lens.

[0066] Furthermore, as Figures 2-6 shown, the optical parameters of each lens in this embodiment, including the curvature radius, thickness, refractive index and Abbe number of the material, and the focal length values are as follows:

[0067]

[0068]

[0069] Among them, the mirror surface numbers of each lens are in sequence from the light incident direction, that is, from the object surface to the imaging surface. R1 is the object side surface of the convex-concave positive lens L1, R2 is the image side surface of the convex-concave positive lens L1, R3 is the object side surface of the convex-concave positive lens L2, R4 is the image side surface of the convex-concave positive lens L2, R5 is the object side surface of the biconvex positive lens L3, R6 is the image side surface of the biconvex positive lens L3 and the object side surface of the biconcave negative lens L4, R7 is the image side surface of the biconcave negative lens L4, R8 is the object side surface of the convex-concave negative lens L5, R9 is the image side surface of the convex-concave negative lens L5 and the object side surface of the convex-concave positive lens L6, R8 is the object side surface of the convex-concave negative lens L5, R9 is the image side surface of the convex-concave negative lens L5 and the object side surface of the convex-concave positive lens L6, R10 is the image side surface of the convex-concave positive lens L6, R11 is the object side surface of the convex-concave positive lens L7, R12 is the image side surface of the convex-concave positive lens L7 and the object side surface of the biconcave negative lens L8, R13 is the image side surface of the biconcave negative lens L8, R14 is the object side surface of the convex-concave positive lens L9, R15 is the image side surface of the convex-concave positive lens L9, and "-" indicates that the mirror surface direction bends towards the image plane side.

[0070] In this embodiment, the effective focal length of the lens is 53.8 mm, the F number is 1.8, the full field of view angle is 9.2°, and the maximum image plane φ = 8.82 mm. As Figure 2 shown, the MTF curves under each field of view decline smoothly, and at 250 lp / mm, the MTF value of the central field of view reaches 0.47, and the MTF value of the edge field of view is greater than 0.25. The imaging effect and resolution of this lens are good. As Figure 3 shown, the defocus curve shows that the curves under each field of view are very concentrated and the defocus is small. As Figure 4 、 5 shown, the MTF curves at high and low temperatures show that this monitoring lens can be defocus-free within the temperature range of -40°C to 80°C. As Figure 6 shown, it is the near-infrared MTF curve graph. The curve is smooth and at 250 lp / mm, the MTF values of each field of view are greater than 0.2. It can be used for near-infrared imaging situations to achieve day and night confocal. The lens can be used for night monitoring, with clear imaging and high imaging quality, meeting the requirements of long focal length and large aperture.

[0071] Embodiment 2:

[0072] As Figure 1 and Figures 7-11 shown, based on the solution described in Embodiment 1, the difference is that the optical parameters of each lens in this embodiment, including the radius of curvature, thickness, refractive index and Abbe number of the material, and the focal length values are as follows:

[0073]

[0074]

[0075] Among them, the mirror surface numbers of each lens are in the order of the light incident direction, that is, from the object surface to the imaging surface. R1 is the object side surface of the convex-concave positive lens L1, R2 is the image side surface of the convex-concave positive lens L1, R3 is the object side surface of the convex-concave positive lens L2, R4 is the image side surface of the convex-concave positive lens L2, R5 is the object side surface of the biconvex positive lens L3, R6 is the image side surface of the biconvex positive lens L3 and the object side surface of the biconcave negative lens L4, R7 is the image side surface of the biconcave negative lens L4, R8 is the object side surface of the convex-concave negative lens L5, R9 is the image side surface of the convex-concave negative lens L5 and the object side surface of the convex-concave positive lens L6, R8 is the object side surface of the convex-concave negative lens L5, R9 is the image side surface of the convex-concave negative lens L5 and the object side surface of the convex-concave positive lens L6, R10 is the image side surface of the convex-concave positive lens L6, R11 is the object side surface of the convex-concave positive lens L7, R12 is the image side surface of the convex-concave positive lens L7 and the object side surface of the biconcave negative lens L8, R13 is the image side surface of the biconcave negative lens L8, R14 is the object side surface of the convex-concave positive lens L9, R15 is the image side surface of the convex-concave positive lens L9, and "-" indicates that the mirror surface direction bends towards the image surface side.

[0076] In this embodiment, the effective focal length of the lens is 53.9 mm, the F number is 1.8, the full field of view angle is 9.2°, and the maximum image surface φ = 8.82 mm. As Figure 7 shown, the MTF curves under each field of view decrease smoothly, and the MTF value of the central field of view reaches 0.48 at 250 lp / mm, and the MTF value of the edge field of view is greater than 0.28. The imaging effect and resolution of this lens are good. As Figure 8 shown by the defocus curve, the curves under each field of view are very concentrated and the defocus is small. As Figure 9 、 10 shown, the MTF curves at high and low temperatures show that this monitoring lens can be defocus-free within a temperature change of -40°C to 80°C. As Figure 11 shown, it is a near-infrared MTF curve graph. The curve is smooth and the MTF value of each field of view is greater than 0.21 at 250 lp / mm. It can be used for near-infrared imaging, realizing day and night confocal. The lens can be used for night monitoring, with clear imaging and high imaging quality, meeting the requirements of long focal length and large aperture.

[0077] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0078] The above-described embodiments merely represent relatively specific and detailed embodiments of the present application, but should not be construed as limiting the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all fall within the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A long focal length and large aperture surveillance lens, characterized in that: The long focal length and large aperture surveillance lens is composed of a convex-concave positive lens L1, a convex-concave positive lens L2, a double-convex positive lens L3, a double-concave negative lens L4, a convex-concave negative lens L5, a convex-concave positive lens L6, a convex-concave positive lens L7, a double-concave negative lens L8, and a convex-concave positive lens L9 arranged in sequence along the light incident direction, where: The double-convex positive lens L3 and the double-concave negative lens L4 form a first cemented group; The convex-concave negative lens L5 and the convex-concave positive lens L6 form a second cemented group; The convex-concave positive lens L7 and the double-concave negative lens L8 form a third cemented group; The long focal length and large aperture surveillance lens also satisfies the following conditions: 0.76 < TTL / f < 1, 1.5 < f1 / f < 2.5, 0.7 < f2 / f < 1.3 wherein, TTL is the total length of the lens, f is the effective focal length of the lens, f1 is the focal length of the convex-concave positive lens L1, and f2 is the focal length of the convex-concave positive lens L2; A diaphragm is provided on the object surface side of the convex-concave positive lens L2. Each lens is a spherical lens, and the focal length value ranges of the convex-concave positive lens L1, the convex-concave positive lens L2, the double-convex positive lens L3, the double-concave negative lens L4, the convex-concave negative lens L5, the convex-concave positive lens L6, the convex-concave positive lens L7, the double-concave negative lens L8, and the convex-concave positive lens L9 are 100×(1±5%), 50×(1±5%), 28×(1±5%), -29×(1±5%), -12×(1±5%), 14×(1±5%), 15×(1±5%), -7×(1±5%), and 26×(1±5%) respectively, with the unit of mm; Both the second cemented group and the third cemented group have negative focal lengths.

2. The long focal length and large aperture surveillance lens according to claim 1, characterized in that: The convex-concave positive lens L1 is a glass lens with a refractive index greater than 1.

95.

3. The long focal length and large aperture surveillance lens according to claim 1, characterized in that: The convex-concave positive lens L2 is a glass lens with an Abbe number greater than 90.

4. The long focal length and large aperture surveillance lens according to claim 1, characterized in that: The working wavelength band of the long focal length and large aperture surveillance lens is visible light 435~656nm or near-infrared light below 850nm.

5. The long focal length and large aperture surveillance lens according to claim 1, characterized in that: A filter is also provided on the image surface side of the convex-concave positive lens L9.

6. The long focal length and large aperture surveillance lens according to claim 1, characterized in that: The double-convex positive lens L3 is made of heavy phosphate crown glass.

7. The long focal length and large aperture surveillance lens according to any one of claims 1 to 6, characterized in that: The refractive index value ranges corresponding to the convex-concave positive lens L1, convex-concave positive lens L2, biconvex positive lens L3, biconcave negative lens L4, convex-concave negative lens L5, convex-concave positive lens L6, convex-concave positive lens L7, biconcave negative lens L8, and convex-concave positive lens L9 are 2×(1±5%), 1.45×(1±5%), 1.6×(1±5%), 1.8×(1±5%), 1.85×(1±5%), 1.6×(1±5%), 1.9×(1±5%), 1.8×(1±5%), and 1.6×(1±5%) respectively; the object-side curvature radius value ranges corresponding to them are 44×(1±5%), 20×(1±5%), 19×(1±5%), -100×(1±5%), 42×(1±5%), 8×(1±5%), -270×(1±5%), -14×(1±5%), and 14×(1±5%) respectively, with the unit of mm; the image-side curvature radius value ranges corresponding to them are 75×(1±5%), 170×(1±5%), -100×(1±5%), 33×(1±5%), 8×(1±5%), 135×(1±5%), -14×(1±5%), 10×(1±5%), and 200×(1±5%) respectively, with the unit of mm, where "-" indicates that the mirror surface direction bends towards the image plane side.

Images