Optical system of an optical image stabilization telescope with flat field mirror

Abstract

This invention discloses an optical system for an optically stabilized telescope with a field-planing lens, belonging to the field of optical lens technology. It includes an objective lens group GR1, a prism group GR2, a field-planing lens group GR3, and an eyepiece group GR4. The objective lens group GR1 includes a first objective lens G1, a second objective lens G2, a third objective lens G3, a focusing lens G4, and a field-stabilizing lens G5. The prism group includes a semi-pentaprism G6 and a roof prism G7. The field-planing lens group includes a first field-planing lens G8 and a second field-planing lens G9. The eyepiece group includes a first eyepiece lens G10, a second eyepiece lens G11, a third eyepiece lens G12, and a fourth eyepiece lens G13. This invention achieves focusing on targets at different distances by adjusting the focusing lens G4. Utilizing gyroscope feedback, the field-stabilizing lens G5 compensates for image shake caused by telescope jitter by translation, stabilizing the target originally in the center of the field of view. This allows the observer to quickly and stably observe, improving observation quality.

Description

Technical Field

[0001] This invention belongs to the field of optical lens technology and relates to an optical system for an optically stabilized telescope with a field-flat lens. Background Technology

[0002] A telescope is a visual optical instrument used to observe distant targets; it gives the observer the feeling that the target is "closer," and reproduces targets or details that are originally beyond the human eye's resolution through the eyepiece for observation. The specific principle is: the angle between the distant target and the human eye is magnified according to the telescope's magnification for observation.

[0003] Because high-magnification telescopes have a relatively small field of view, handheld observation is difficult due to arm tremors, making it hard for the observer to clearly see the specific details of the target in a short time. The observation experience is also poor for dynamic scenes that are moving. Stabilizers or tripods are required for stable observation, but stabilizers and tripods are generally large and heavy, making them inconvenient to carry. Therefore, it is essential to provide an optical system for an optically stabilized telescope that can quickly stabilize observation and improve the quality of observation. Summary of the Invention

[0004] The purpose of this invention is to provide an optical system for an optically stabilized telescope with a field-planar lens, which solves the aforementioned problems. This invention achieves focusing on targets at different distances by adjusting the focusing lens G4; and utilizes gyroscope feedback information to enable the stabilizing lens G5 to compensate for image shake caused by telescope jitter by translation, keeping the target originally in the center of the field of view stable in the center, thereby enabling the observer to quickly and stably observe and improve the quality of observation.

[0005] The technical solution adopted in this invention is as follows: An optical system for an optically stabilized telescope with a field-planing lens comprises, along the optical axis from the object side to the image side, an objective lens group GR1, a prism group GR2, a field-planing lens group GR3, and an eyepiece group GR4. The objective lens group GR1 includes a first objective lens G1, a second objective lens G2, a third objective lens G3, a focusing lens G4, and a field-stabilizing lens G5. The prism group GR2 includes a half-pentagonal prism G6 and a roof prism G7. The field-planing lens group GR3 includes a first field-planing lens G8 and a second field-planing lens G9. The eyepiece group GR4 includes a first eyepiece lens G10, a second eyepiece lens G11, a third eyepiece lens G12, and a fourth eyepiece lens G13. During the focusing process from far to near, focusing lens G4 moves toward the object side; The optical system satisfies the following condition: 1.453 < ΦGR1 / ΦGR123 < 1.671; 1.405 < |ΦGR1 / ΦGR3| < 1.897; 1.384 < ΦG13 / ΦG10 < 1.552; Wherein ΦGR1 is the optical power of objective lens group GR1; ΦGR123 is the combined optical power of objective lens group GR1, prism group GR2, and plan lens group GR3; ΦGR3 is the combined optical power of plan lens group GR3; ΦG10 is the optical power of the first eyepiece lens G10; and ΦG13 is the optical power of the fourth eyepiece lens G13.

[0006] Furthermore, the objective lens group GR1 includes an objective lens first lens G1, an objective lens second lens G2, an objective lens third lens G3, a focusing lens G4, and an image stabilizing lens G5. The objective lens first lens G1 and the objective lens second lens G2 form a cemented lens. The prism group GR2 includes a semi-pentagonal prism G6 and a roof prism G7; The plan lens group GR3 includes a first plan lens G8 and a second plan lens G9. The eyepiece group GR4 includes an eyepiece first lens G10, an eyepiece second lens G11, an eyepiece third lens G12, and an eyepiece fourth lens G13.

[0007] Furthermore, the first objective lens G1 is a biconvex lens; The objective lens G2 is a meniscus lens, which is a negative lens, and the center of the sphere is on the object side. Objective lens G1 and objective lens G2 together form a cemented lens, satisfying the following condition: 0.658 < |ΦG2 / ΦG1| < 0.788; 1.489 < |ΦGR1 / ΦG1G2| < 1.633; Where ΦG1 is the optical power of the first objective lens G1; ΦG2 is the optical power of the second objective lens G2; ΦG1G2 is the optical power of the cemented lens composed of the first objective lens G1 and the second objective lens G2; and ΦGR1 is the combined optical power of the objective lens group GR1.

[0008] Furthermore, the objective lens G3 is a biconvex lens, satisfying the following condition: 0.552 < |ΦGR1 / ΦG3| < 0.631; Where ΦG3 is the optical power of the third objective lens G3; and ΦGR1 is the combined optical power of the objective lens group GR1.

[0009] Furthermore, the focusing lens G4 is a positive lens, belonging to the meniscus lens category, and its sphere center is always on the image side, satisfying the following condition: 1.001 < |ΦGR1 / ΦG4| < 1.134; Where ΦG4 is the optical power of the focusing lens G4; ΦGR1 is the combined optical power of the objective lens group GR1; The image stabilization lens G5 is a negative lens, belonging to the plano-concave lens category, and satisfies the following condition: 0.18 < |ΦGR1 / ΦG5| < 0.26; Where ΦG5 is the optical power of the image stabilization lens G5; and ΦGR1 is the combined optical power of the objective lens group GR1.

[0010] Furthermore, the first plan-field mirror G8 is a negative lens, belonging to the biconcave lens category, and satisfies the following condition: 0.102 < |ΦGR3 / ΦG8| < 0.213; Where ΦG8 is the optical power of the first plan lens G8; ΦGR3 is the combined optical power of the plan lens group GR3.

[0011] Furthermore, the second plan-field mirror G9 is characterized by being a positive lens, specifically a meniscus lens, and satisfies the following condition: 0.212 < |ΦGR3 / ΦG9| < 0.387; Where ΦG9 is the optical power of the second plan lens G9; ΦGR3 is the combined optical power of the plan lens group GR3.

[0012] Furthermore, the first lens G10 of the eyepiece is a positive lens, belonging to the meniscus lens, with the centers of both spheres located on the object surface, and satisfies the following condition: 0.325 < |ΦG10 / ΦGR4| < 0.542; Where ΦG10 is the optical power of the first lens G10 of the eyepiece; ΦGR4 is the combined optical power of the eyepiece group GR4.

[0013] Furthermore, the second eyepiece lens G11 is a negative lens; the third eyepiece lens G12 is a positive lens, belonging to the biconvex lens category; the second eyepiece lens G11 and the third eyepiece lens G12 form a cemented lens, and satisfy the following relationship: 0.164<|ΦG11G12 / ΦG11|<0.231; 1.462 < |ΦGR4 / ΦG12| < 1.570; Wherein ΦG11 is the optical power of the second eyepiece lens G11; ΦG12 is the optical power of the third eyepiece lens G12; ΦG11G12 is the optical power of the cemented lens formed by the second eyepiece lens G11 and the third eyepiece lens G12; and ΦGR4 is the combined optical power of the eyepiece group GR4.

[0014] Furthermore, the fourth lens G13 of the eyepiece is a positive lens, satisfying the following condition: 1.384 < ΦG13 / ΦG10 < 1.552; Where ΦG10 is the optical power of the first eyepiece lens G10; and ΦG13 is the optical power of the fourth eyepiece lens G13.

[0015] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. An optical system for an optically stabilized telescope with a field-planing lens, which optimizes the optical power ratio of the objective lens group, prism group, field-planing lens group and eyepiece group by reasonably configuring the optical power ratio of each component combination and the optical power of a single lens, optimizes the optical path transmission, effectively balances various aberrations, and significantly improves the telescope's imaging clarity and image uniformity.

[0016] 2. This invention employs a modular and collaborative design of an objective lens group, a prism group, a field plan lens group, and an eyepiece group. The objective lens group undertakes the main imaging, image stabilization, and focusing functions; the prism group achieves optical path reversal; the field plan lens group corrects field curvature and distortion; and the eyepiece group optimizes visual effects, effectively suppressing chromatic aberration, field curvature, and distortion at 12x magnification. 3. The dispersion compensation design of the cemented lenses (first lens and second lens) in the objective lens group and the cemented lenses (eleventh lens and twelfth lens) in the eyepiece group in this invention, combined with optical materials with specific refractive index and Abbe number, greatly reduces axial chromatic aberration and transverse chromatic aberration, and improves color reproduction and edge imaging quality. 4. In this invention, only the focusing lens G4 moves during focusing, while the image stabilization lens G5 independently performs translation compensation, effectively reducing the weight of the focusing assembly and making focusing faster; the optical power condition of the image stabilization lens (0.18<|ΦGR1 / ΦG5|<0.26) and the optical power condition of the focusing lens (1.001<|ΦGR1 / ΦG4|<1.134) ensure accurate image stabilization compensation and stable image plane during focusing; 5. The positive and negative lens combination design of the double lens group (eighth lens and ninth lens) in the plan lens group of the present invention, together with the optical power constraints of the objective lens group and the eyepiece group, can effectively correct the field curvature and distortion of the entire field of view, realize plan imaging, and improve the uniformity of image quality in the apparent field of view. 6. This invention adopts a translational optical image stabilization design with an anti-shake lens, which, together with a gyroscope, provides real-time feedback on shaking information. It requires no additional power supply and has no image quality loss. It can quickly compensate for image shaking and achieve stable handheld observation without relying on a tripod or stabilizer, greatly improving ease of use and scene adaptability. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort, wherein: Figure 1 This is a schematic diagram of the optical structure of Embodiment 1 of the present invention; Figure 2 This refers to the axial color difference at infinity in Example 1. Figure 3 This refers to the field curvature distortion at infinity in Example 1; Figure 4 This is a schematic diagram of the optical structure of Embodiment 2 of the present invention; Figure 5 This refers to the axial color difference at infinity in Example 2; Figure 6 To implement field curvature distortion at infinity; The markings in the diagram are: Objective lens 1 G1, Objective lens 2 G2, Objective lens 3 G3, Focusing lens G4, Image stabilizing lens G5, Semi-pentaprism G6, Roof prism G7, First plan lens G8, Second plan lens G9, Eyepiece 1 lens G10, Eyepiece 2 lens G11, Eyepiece 3 lens G12, and Eyepiece 4 lens G13. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, and not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0020] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0021] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0022] This invention provides an optical system for an optically stabilized telescope with a field-planing lens. Along the optical axis from the object side to the image side, an objective lens group GR1, a prism group GR2, a field-planing lens group GR3, and an eyepiece group GR4 are arranged sequentially. The objective lens group GR1 includes a first objective lens G1, a second objective lens G2, a third objective lens G3, a focusing lens G4, and a field-stabilizing lens G5. The prism group GR2 includes a half-pentagonal prism G6 and a roof prism G7. The field-planing lens group GR3 includes a first field-planing lens G8 and a second field-planing lens G9. The eyepiece group GR4 includes a first eyepiece lens G10, a second eyepiece lens G11, a third eyepiece lens G12, and a fourth eyepiece lens G13. During the focusing process from far to near, focusing lens G4 moves toward the object side; The optical system satisfies the following condition: 1.453 < ΦGR1 / ΦGR123 < 1.671; 1.405 < |ΦGR1 / ΦGR3| < 1.897; 1.384 < ΦG13 / ΦG10 < 1.552; Wherein ΦGR1 is the optical power of objective lens group GR1; ΦGR123 is the combined optical power of objective lens group GR1, prism group GR2, and plan lens group GR3; ΦGR3 is the combined optical power of plan lens group GR3; ΦG10 is the optical power of the first eyepiece lens G10; and ΦG13 is the optical power of the fourth eyepiece lens G13.

[0023] The objective lens group GR1 includes an objective lens first lens G1, an objective lens second lens G2, an objective lens third lens G3, a focusing lens G4, and an image stabilization lens G5. The objective lens first lens G1 and the objective lens second lens G2 form a cemented lens. The prism group GR2 includes a semi-pentagonal prism G6 and a roof prism G7; The plan lens group GR3 includes a first plan lens G8 and a second plan lens G9. The eyepiece group GR4 includes an eyepiece first lens G10, an eyepiece second lens G11, an eyepiece third lens G12, and an eyepiece fourth lens G13.

[0024] The objective lens, first lens G1, is a biconvex lens; The objective lens G2 is a meniscus lens, which is a negative lens, and the center of the sphere is on the object side. Objective lens G1 and objective lens G2 together form a cemented lens, satisfying the following condition: 0.658 < |ΦG2 / ΦG1| < 0.788; 1.489 < |ΦGR1 / ΦG1G2| < 1.633; Where ΦG1 is the optical power of the first objective lens G1; ΦG2 is the optical power of the second objective lens G2; ΦG1G2 is the optical power of the cemented lens composed of the first objective lens G1 and the second objective lens G2; and ΦGR1 is the combined optical power of the objective lens group GR1.

[0025] The objective lens, third lens G3, is a biconvex lens that satisfies the following condition: 0.552 < |ΦGR1 / ΦG3| < 0.631; Where ΦG3 is the optical power of the third objective lens G3; and ΦGR1 is the combined optical power of the objective lens group GR1.

[0026] The focusing lens G4 is a positive lens, belonging to the meniscus lens category, and its sphere center is always on the image side, satisfying the following condition: 1.001 < |ΦGR1 / ΦG4| < 1.134; Where ΦG4 is the optical power of the focusing lens G4; ΦGR1 is the combined optical power of the objective lens group GR1; The image stabilization lens G5 is a negative lens, belonging to the plano-concave lens category, and satisfies the following condition: 0.18 < |ΦGR1 / ΦG5| < 0.26; Where ΦG5 is the optical power of the image stabilization lens G5; and ΦGR1 is the combined optical power of the objective lens group GR1.

[0027] Furthermore, the feature is that: the first flat-field mirror G8 is a negative lens, belonging to a biconcave lens, and satisfies the following condition: 0.102 < |ΦGR3 / ΦG8| < 0.213; Where ΦG8 is the optical power of the first plan lens G8; ΦGR3 is the combined optical power of the plan lens group GR3.

[0028] The second plan lens G9 is a positive lens, belonging to the category of meniscus lenses, and satisfies the following condition: 0.212 < |ΦGR3 / ΦG9| < 0.387; Where ΦG9 is the optical power of the second plan lens G9; ΦGR3 is the combined optical power of the plan lens group GR3.

[0029] The first lens G10 of the eyepiece is a positive lens, belonging to the meniscus lens, with the centers of both spheres located on the object surface, and satisfies the following condition: 0.325 < |ΦG10 / ΦGR4| < 0.542; Where ΦG10 is the optical power of the first lens G10 of the eyepiece; ΦGR4 is the combined optical power of the eyepiece group GR4.

[0030] The second eyepiece lens G11 is a negative lens; the third eyepiece lens G12 is a positive lens, belonging to the biconvex lens category; the second eyepiece lens G11 and the third eyepiece lens G12 form a cemented lens, and satisfy the following relationship: 0.164<|ΦG11G12 / ΦG11|<0.231; 1.462 < |ΦGR4 / ΦG12| < 1.570; Wherein ΦG11 is the optical power of the second eyepiece lens G11; ΦG12 is the optical power of the third eyepiece lens G12; ΦG11G12 is the optical power of the cemented lens formed by the second eyepiece lens G11 and the third eyepiece lens G12; and ΦGR4 is the combined optical power of the eyepiece group GR4.

[0031] The fourth lens G13 of the eyepiece is a positive lens, satisfying the following condition: 1.384 < ΦG13 / ΦG10 < 1.552; Where ΦG10 is the optical power of the first eyepiece lens G10; and ΦG13 is the optical power of the fourth eyepiece lens G13.

[0032] The following are specific embodiments of the present invention based on the above content, including specific parameters: Example 1

[0033] like Figure 1 As shown in the figure, this embodiment provides an optical system for an optically stabilized telescope with a flat field lens. In this embodiment, the physical parameters of the optical system are shown in Table 1, the surface type, radius of curvature, thickness, material refractive index (Nd) and Abbe number (Vd) of each lens are shown in Table 2, and the lens positions under different focusing states are shown in Table 3.

[0034] Table 1: Physical Parameters of Example 1 Visual magnification (Γ) 12 Object-side field of view (°) (2w) 5 Exit pupil distance (mm) 15 Apparent field of view ° 57.4 Exit pupil diameter (mm) 2.33 Table 2 Parameters of each lens radius of curvature Thickness / Gap Nd Vd 1 51.553 5.60 1.437 95.100 2 -47.341 1.80 1.788 47.470 3 -190.339 0.10 4 35.832 5.11 1.437 95.100 5 -248.303 D5 6 42.045 6.99 1.744 44.893 7 67.522 D7 8 Infinite 1.00 1.697 55.510 9 18.249 8.00 10 Infinite 25.20 1.569 56.041 11 Infinite 0.40 12 Infinite 37.76 1.517 64.199 13 Infinite 2.30 14 -9.354 1.20 1.550 75.225 15 25.462 1.63 16 -30.116 5.37 1.497 81.556 17 -8.864 10.10 18 -48.169 4.90 1.697 55.510 19 -19.319 0.10 20 Infinite 1.50 1.946 17.989 21 26.136 7.58 1.497 81.556 22 -21.569 0.10 23 15.500 4.66 1.697 55.510 24 50.733 - In Table 2, the sign of the radius of curvature indicates the direction of curvature of the lens surface: a positive radius of curvature indicates that the surface bends towards the object side; a negative radius of curvature indicates that the surface bends towards the image side. The values ​​in the thickness column represent the distance on the optical axis between the surface and its adjacent surface on the image side.

[0035] In this embodiment, the positions of the optical system of the optically stabilized telescope under different focusing states are shown in Table 3 below, which are the values ​​of D5 and 72 in Table 1: Table 3. Position of the optical system of the optically stabilized telescope under different focusing conditions. Conjugate distance Infinity 3m D5 5.63 4.57 D7 7.64 6.58 like Figure 2 The figure shows the axial chromatic aberration diagram when focusing at infinity in this embodiment. As can be seen from the figure, this embodiment has achieved good correction for axial chromatic aberration, and the focusing positions of light rays in each wavelength band are close. Figure 3 The figure shows the field curvature and distortion diagram when focusing at infinity in this embodiment. As can be seen from the figure, the field curvature and distortion in this embodiment are controlled within a small range, resulting in a flat image with low geometric distortion. Combined with the parameters in Tables 1 to 3, it can be seen that all optical parameters in this embodiment satisfy the conditions protected by this invention, achieving 12x telephoto observation with high image quality, low chromatic aberration, flat field, and optical image stabilization.

[0036] Example 2 Please refer to Figure 4 , Figure 4 This is a schematic diagram of the optical structure of Embodiment 2 of the present invention. This embodiment provides another optical system for an optically stabilized telescope with a field-planar lens. In this embodiment, the physical parameters of the optical system are shown in Table 4, the surface type, radius of curvature, thickness, material refractive index (Nd), and Abbe number (Vd) of each lens are shown in Table 5, and the lens positions under different focusing states are shown in Table 6.

[0037] Table 4: Physical Parameters of Example 2 Visual magnification (Γ) 12 Object-side field of view (°) (2w) 5 Exit pupil distance (mm) 16 Apparent field of view ° 57.17 Exit pupil diameter (mm) 2.08 Table 4 shows the radius of curvature, thickness, refractive index, and Abbe number of each lens in the optical system within the scope of Example 2; the radius of curvature column shows the radius of curvature of a certain lens, where a positive radius of curvature indicates that the surface is bent towards the object side, and a negative radius of curvature indicates that the surface is bent towards the image side; the thickness column shows the surface spacing on the optical axis between each surface and the surface adjacent to it on the image side; the refractive index column shows the refractive index of a certain lens; and the Abbe number column shows the Abbe number of a certain lens.

[0038] Table 5 Lens Data Face number radius of curvature Thickness / Gap Nd Vd 1 51.127 5.21 1.438 94.508 2 -46.679 1.5 1.788 47.492 3 -189.810 0.1 4 35.476 4.46 1.438 94.508 5 -221.279 D5 6 41.728 6 1.744 44.900 7 69.713 D7 8 Infinite 1 1.697 55.526 9 19.17 8.97 10 Infinite 25 1.569 56.041 11 Infinite 0.35 12 Infinite 38 1.517 64.199 13 Infinite 2.6977 14 -8.541 1.68 1.550 75.225 15 21.808 1.48 16 -41.648 6.32 1.497 81.613 17 -8.761 10.67 18 -49.770 4.34 1.755 52.322 19 -17.602 0.1 20 -70.560 1.5 1.923 20.880 21 21.129 6.89 1.438 94.523 22 -21.129 0.1 23 17.950 5.07 1.755 52.322 24 -870.967 - The positions of the optical system of the optically stabilized telescope in this embodiment under different focusing states are shown in Table 6 below, which are the values ​​of the two states D5 and D7 in Table 5: Table 6: Lens positions under different focusing conditions Conjugate distance Infinity 3m D5 5.03 4.02 D7 7.57 7.58 like Figure 5 The image shown is an axial chromatic aberration diagram for this embodiment when focusing at infinity. Similar to Embodiment 1, the axial chromatic aberration in this embodiment is also well corrected. Figure 6 The figure shows the field curvature and distortion diagram when focusing at infinity in this embodiment. The figure shows that both field curvature and distortion are effectively controlled. Comparing Embodiment 1 and Embodiment 2, it can be seen that, under the premise of satisfying the core condition formula, both can achieve excellent field flatness and image stabilization optical performance by fine-tuning lens parameters (such as curvature, thickness, and material) and spacing.

[0039] Conditional Validation Table 7 summarizes the specific values ​​of each conditional expression in the two embodiments of the present invention. All values ​​fall within the range defined by the claims, proving that the technical solution of the present invention has sufficient feasibility and consistency.

[0040] Table 7: Summary List of Conditional Expressions Conditional expression Example 1 Example 2 1.493<ΦGR1 / ΦGR123<1.711 1.608 1.6892 1.405<|ΦGR1 / ΦGR3|<1.897 1.825 1.443 1.384<ΦG13 / ΦG10<1.552 1.424 1.459 0.658<|ΦG2 / ΦG1|<0.788 0.715 0.718 1.489<|ΦGR1 / ΦG1G2|<1.633 1.499 1.582 0.552<|ΦGR1 / ΦG3|<0.631 0.573 0.587 1.001<|ΦGR1 / ΦG4|<1.134 1.066 1.067 0.18<|ΦGR1 / ΦG5|<0.26 0.208 0.230 0.102<|ΦGR3 / ΦG8|<0.213 0.178 0.132 0.212<|ΦGR3 / ΦG9|<0.387 0.338 0.253 0.325<|ΦG10 / ΦGR4|<0.542 0.372 0.495 0.164<|ΦG11G12 / ΦG11|<0.231 0.217 0.210 1.462<|ΦGR4 / ΦG12|<1.570 1.560 1.507 1.384<ΦG13 / ΦG10<1.552 1.424 1.46 The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, and improvements made by those skilled in the art within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An optical system for an optically stabilized telescope with a field-planar mirror, characterized in that: Along the optical axis from the object side to the image side, an objective lens group GR1, a prism group GR2, a field plan lens group GR3, and an eyepiece group GR4 are arranged sequentially. The objective lens group GR1 includes a first objective lens G1, a second objective lens G2, a third objective lens G3, a focusing lens G4, and an image stabilizing lens G5. The prism group GR2 includes a half-pentagonal prism G6 and a roof prism G7. The field plan lens group GR3 includes a first field plan lens G8 and a second field plan lens G9. The eyepiece group GR4 includes a first eyepiece lens G10, a second eyepiece lens G11, a third eyepiece lens G12, and a fourth eyepiece lens G13. During the focusing process from far to near, focusing lens G4 moves toward the object side; The optical system satisfies the following condition: 1.453 < ΦGR1 / ΦGR123 < 1.671; 1.405 < |ΦGR1 / ΦGR3| < 1.897; 1.384 < ΦG13 / ΦG10 < 1.552; Wherein ΦGR1 is the optical power of objective lens group GR1; ΦGR123 is the combined optical power of objective lens group GR1, prism group GR2, and plan lens group GR3; ΦGR3 is the combined optical power of plan lens group GR3; ΦG10 is the optical power of the first eyepiece lens G10; and ΦG13 is the optical power of the fourth eyepiece lens G13.

2. The optical system of an optically stabilized telescope with a field-planar lens according to claim 1, characterized in that: The objective lens group GR1 includes an objective lens first lens G1, an objective lens second lens G2, an objective lens third lens G3, a focusing lens G4, and an image stabilization lens G5. The objective lens first lens G1 and the objective lens second lens G2 form a cemented lens. The prism group GR2 includes a semi-pentagonal prism G6 and a roof prism G7; The plan lens group GR3 includes a first plan lens G8 and a second plan lens G9. The eyepiece group GR4 includes an eyepiece first lens G10, an eyepiece second lens G11, an eyepiece third lens G12, and an eyepiece fourth lens G13.

3. The optical system of an optically stabilized telescope with a field-planar lens according to claim 1, characterized in that: The objective lens, first lens G1, is a biconvex lens; The objective lens G2 is a meniscus lens, which is a negative lens, and the center of the sphere is on the object side. Objective lens G1 and objective lens G2 together form a cemented lens, satisfying the following condition: 0.658 < |ΦG2 / ΦG1| < 0.788; 1.489 < |ΦGR1 / ΦG1G2| < 1.633; Where ΦG1 is the optical power of the first objective lens G1; ΦG2 is the optical power of the second objective lens G2; ΦG1G2 is the optical power of the cemented lens composed of the first objective lens G1 and the second objective lens G2. ΦGR1 is the combined optical power of objective lens group GR1.

4. The optical system of an optically stabilized telescope with a field-planar lens according to claim 1, characterized in that: The objective lens, third lens G3, is a biconvex lens that satisfies the following condition: 0.552 < |ΦGR1 / ΦG3| < 0.631; Where ΦG3 is the optical power of the third objective lens G3; and ΦGR1 is the combined optical power of the objective lens group GR1.

5. The optical system of an optically stabilized telescope with a field-planar lens according to claim 1, characterized in that: The focusing lens G4 is a positive lens, belonging to the meniscus lens category, and its sphere center is always on the image side, satisfying the following condition: 1.001 < |ΦGR1 / ΦG4| < 1.134; Where ΦG4 is the optical power of the focusing lens G4; ΦGR1 is the combined optical power of the objective lens group GR1; The image stabilization lens G5 is a negative lens, belonging to the plano-concave lens category, and satisfies the following condition: 0.18 < |ΦGR1 / ΦG5| < 0.26; Where ΦG5 is the optical power of the image stabilization lens G5; and ΦGR1 is the combined optical power of the objective lens group GR1.

6. The optical system of an optically stabilized telescope with a field-planar lens according to claim 1, characterized in that: The first plan mirror G8 is a negative lens, belonging to the biconcave lens category, and satisfies the following condition: 0.102 < |ΦGR3 / ΦG8| < 0.213; Where ΦG8 is the optical power of the first plan lens G8; ΦGR3 is the combined optical power of the plan lens group GR3.

7. The optical system of an optically stabilized telescope with a field-planar lens according to claim 1, characterized in that: The second plan lens G9 is a positive lens, belonging to the category of meniscus lenses, and satisfies the following condition: 0.212 < |ΦGR3 / ΦG9| < 0.387; Where ΦG9 is the optical power of the second plan lens G9; ΦGR3 is the combined optical power of the plan lens group GR3.

8. The optical system of an optically stabilized telescope with a field-planar lens according to claim 1, characterized in that: The first lens G10 of the eyepiece is a positive lens, belonging to the meniscus lens, with the centers of both spheres located on the object surface, and satisfies the following condition: 0.325 < |ΦG10 / ΦGR4| < 0.542; Where ΦG10 is the optical power of the first lens G10 of the eyepiece; ΦGR4 is the combined optical power of the eyepiece group GR4.

9. The optical system of an optically stabilized telescope with a field-planar lens according to claim 1, characterized in that: The second eyepiece lens G11 is a negative lens; the third eyepiece lens G12 is a positive lens, belonging to the biconvex lens category; the second eyepiece lens G11 and the third eyepiece lens G12 form a cemented lens, and satisfy the following relationship: 0.164<|ΦG11G12 / ΦG11|<0.231; 1.462 < |ΦGR4 / ΦG12| < 1.570; Wherein ΦG11 is the optical power of the second eyepiece lens G11; ΦG12 is the optical power of the third eyepiece lens G12; ΦG11G12 is the optical power of the cemented lens formed by the second eyepiece lens G11 and the third eyepiece lens G12; and ΦGR4 is the combined optical power of the eyepiece group GR4.

10. The optical system of an optically stabilized telescope with a field-planar lens according to claim 1, characterized in that: The fourth lens G13 of the eyepiece is a positive lens, satisfying the following condition: 1.384 < ΦG13 / ΦG10 < 1.552; Where ΦG10 is the optical power of the first eyepiece lens G10; and ΦG13 is the optical power of the fourth eyepiece lens G13.

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