Optical System

Abstract

To provide an optical system which has a large compensation angle and compact size, and yet offers good optical performance.SOLUTION: An optical system is provided, comprising an objective lens module, an image inversion module, and an eyepiece module arranged in order from the object side to the image side along an optical axis. The objective lens module has refractive power and includes a first lens group, a second lens group, a third lens group, a fourth lens group, and a fifth lens group. The first, second, third, fourth and fifth lens groups are arranged in order from the object side to the image side along the optical axis. The optical system satisfies the following condition: 0.45≤LG4D / LG1D≤0.8, where LG4D represents an effective optical diameter of the fourth lens group and LG1D represents an effective optical diameter of the first lens group.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to optical systems. [Background technology]

[0002] The conventional optical system with optical image stabilization function is large in size, and in order to achieve a large compensation angle, the required optical image stabilization element must be increased, and the moving distance of the optical image stabilization element must also be increased, so the size of the optical system increases, and the conventional optical system cannot meet this requirement. Therefore, the optical system needs a new structure that meets the requirements of a large compensation angle and a small optical system size at the same time. Summary of the Invention [Problem to be solved by the invention]

[0003] SUMMARY OF THE PRESENT EMBODIMENT The present invention aims to provide an optical system with a large compensation angle, small optical system size, and good optical performance, thereby solving the above-mentioned problems. [Means for solving the problem]

[0004] The optical system of the present invention includes an objective lens module, an image inverting module, and an eyepiece lens module. The objective lens module has a refractive power, and includes a first lens group, a second lens group, a third lens group, a fourth lens group, and a fifth lens group. The objective lens module, the image inverting module, and the eyepiece lens module are arranged in order from the object side to the image side along the optical axis. The first lens group, the second lens group, the third lens group, the fourth lens group, and the fifth lens group are arranged from the object side to the image side along the optical axis. The optical system satisfies at least one of the following conditions: 0.45 ≦ LG4D / LG1D ≦ 0.8; 0.015 mm -1 ≦1 / fG3≦0.045 mm -1 ;0.045mm-1 ≦│1 / fG4│≦0.07 mm -1 0.35≦│fG4 / fG3│≦0.75;0.15≦fG1 / f≦1.6. LG4D is the optical effective diameter of the fourth lens group, LG1D is the optical effective diameter of the first lens group, fG1 is the effective focal length of the first lens group, fG3 is the effective focal length of the third lens group, fG4 is the effective focal length of the fourth lens group, and f is the effective focal length of the objective lens module. The optical system of the present invention has the above-mentioned characteristics, and if the above-mentioned conditions are met, the basic efficacy of the optical system of the present invention can be achieved.

[0005] The image inversion module has a first prism and a second prism. The eyepiece module has a refractive power. The eyepiece module has a sixth lens group, a seventh lens group, and an eighth lens group. The sixth lens group, the seventh lens group, and the eighth lens group are arranged along the optical axis in order from the object side to the image side. The first lens group has a positive refractive power. The second lens group has a refractive power and has a third lens. The third lens has a concave surface facing the image side. The third lens group has a positive refractive power and has a fourth lens, the fourth lens has a convex surface facing the object side. The fourth lens group has a negative refractive power and has a fifth lens, the fifth lens is a biconcave lens with negative refractive power and has a concave surface facing the object side and another concave surface facing the image side. The fifth lens group has a refractive power and includes a sixth lens, the sixth lens having a negative refractive power and a concave surface facing the object side. The sixth lens group has a refractive power. The seventh lens group has a refractive power. The eighth lens group has a refractive power. The second lens group can move along the optical axis, so that the optical system can focus. The fourth lens group can move along a direction perpendicular to the optical axis, so that the optical system can achieve optical image stabilization.

[0006] The fifth lens group includes a sixth lens and an eleventh lens, the eleventh lens being disposed between the sixth lens and the image inversion module, the sixth lens having a negative refractive power and having a concave surface facing the object side, and the eleventh lens being a biconvex lens having a positive refractive power and having a convex surface facing the object side and another convex surface facing the image side.

[0007] The second lens group has positive refractive power, the third lens is a meniscus lens and has a convex surface facing the object side, the fourth lens is a meniscus lens with positive refractive power and has a concave surface facing the image side, the fifth lens group has negative refractive power, the sixth lens is a biconcave lens with negative refractive power and has another concave surface facing the image side, and the sixth and eleventh lenses are cemented. The sixth lens group has positive refractive power and includes a seventh lens and an eighth lens, the seventh lens is a biconcave lens having negative refractive power and has a concave surface facing the object side and another concave surface facing the image side, and the eighth lens is a biconvex lens having positive refractive power and has a convex surface facing the object side and another convex surface facing the image side, the seventh lens and the eighth lens are arranged in order from the object side to the image side along the optical axis, and the seventh lens and the eighth lens are fixed with cement. The seventh lens group has positive refractive power and includes a ninth lens, which is a biconvex lens with positive refractive power and has a convex surface facing the object side and another convex surface facing the image side; the eighth lens group has positive refractive power and includes a tenth lens, which is a plano-convex lens with positive refractive power and has a convex surface facing the object side and another convex surface facing the image side.

[0008] The first lens group includes a first lens and a second lens. The first lens is a biconvex lens having positive refractive power and has a convex surface facing the object side and another convex surface facing the image side. The second lens is a biconcave lens having negative refractive power and has a concave surface facing the object side and another concave surface facing the image side. The first lens and the second lens are fixed with cement. The first lens and the second lens are arranged in order from the object side to the image side along the optical axis.

[0009] The second lens group has positive refractive power, the third lens is a meniscus lens and has a convex surface facing the object side, the fourth lens is a biconvex lens with positive refractive power and has another convex surface facing the image side, the fifth lens group has positive refractive power, the sixth lens is a biconcave lens with negative refractive power and has another concave surface facing the image side, and the sixth and eleventh lenses are fixed with cement. The sixth lens group has positive refractive power and includes a seventh lens and an eighth lens, the seventh lens is a biconcave lens with negative refractive power and has a concave surface facing the object side and another concave surface facing the image side, the eighth lens is a biconvex lens with positive refractive power and has a convex surface facing the object side and another convex surface facing the image side, the seventh lens and the eighth lens are arranged in order from the object side to the image side along the optical axis, and the seventh lens and the eighth lens are fixed with cement. The seventh lens group has positive refractive power and includes a ninth lens, the ninth lens is a biconvex lens with positive refractive power and has a convex surface facing the object side and another convex surface facing the image side. The eighth lens group has positive refractive power and includes a tenth lens, which is a plano-convex lens having positive refractive power and has a convex surface facing the object side and a planar surface facing the image side.

[0010] The first lens group includes a first lens and a second lens. The first lens is a meniscus lens having negative refractive power and has a convex surface facing the object side and a concave surface facing the image side. The second lens is a meniscus lens having positive refractive power and has a convex surface facing the object side and a concave surface facing the image side. The first lens and the second lens are fixed with cement. The first lens and the second lens are arranged in order from the object side to the image side along the optical axis.

[0011] The first lens group includes a first lens and a second lens, the first lens being a biconvex lens having a positive refractive power and having a convex surface facing the object side and another convex surface facing the image side, the second lens being a meniscus lens having a negative refractive power and having a concave surface facing the object side and a convex surface facing the image side, and the first lens and the second lens being fixed with cement. The first lens and the second lens are arranged in order from the object side to the image side along the optical axis. The second lens group has a negative refractive power, the third lens is a biconcave lens having a negative refractive power and having another concave surface facing the object side. The fourth lens is a biconvex lens having a positive refractive power and having another convex surface facing the image side. The fifth lens group has a positive refractive power, and the sixth lens is a meniscus lens having a negative refractive power and having a convex surface facing the image side. The sixth lens group has a negative refractive power and includes a seventh lens and an eighth lens, the seventh lens is a biconcave lens with a negative refractive power and has a concave surface facing the object side and another concave surface facing the image side, the eighth lens is a biconvex lens with a positive refractive power and has a convex surface facing the object side and another convex surface facing the image side, the seventh lens and the eighth lens are arranged in order from the object side to the image side along the optical axis, and the seventh lens and the eighth lens are fixed with cement. The seventh lens group has a positive refractive power and includes a ninth lens, the ninth lens is a biconvex lens with a positive refractive power and has a convex surface facing the object side and another convex surface facing the image side. The eighth lens group has positive refractive power and includes a tenth lens, which is a meniscus lens having positive refractive power and has a convex surface facing the object side and a concave surface facing the image side.

[0012] The second lens group includes a third lens and an eleventh lens, the eleventh lens being disposed between the third lens and the third lens group, the second lens group having negative refractive power. The third lens is a biconcave lens having negative refractive power and has a concave surface facing the object side and another concave surface facing the image side. The eleventh lens is a biconvex lens having positive refractive power and has a convex surface facing the object side and another convex surface facing the image side. The third lens and the eleventh lens are fixed with cement.

[0013] The first lens group includes a first lens and a second lens, the first lens being a meniscus lens having a negative refractive power and having a convex surface facing the object side and a concave surface facing the image side, the second lens being a biconvex lens having a positive refractive power and having a convex surface facing the object side and another convex surface facing the image side, the first lens and the second lens being fixed with cement, the first lens and the second lens being arranged in order from the object side to the image side along the optical axis, the fourth lens being a biconvex lens having a positive refractive power and having another convex surface facing the image side, the fifth lens group having a negative refractive power, and the sixth lens being a meniscus lens having a negative refractive power and having a convex surface facing the image side. The sixth lens group has a negative refractive power and includes a seventh lens and an eighth lens, the seventh lens is a biconcave lens with a negative refractive power and has a concave surface facing the object side and another concave surface facing the image side, the eighth lens is a biconvex lens with a positive refractive power and has a convex surface facing the object side and another convex surface facing the image side, the seventh lens and the eighth lens are arranged in order from the object side to the image side along the optical axis, and the seventh lens and the eighth lens are fixed with cement. The seventh lens group has a positive refractive power and includes a ninth lens, the ninth lens is a biconvex lens with a positive refractive power and has a convex surface facing the object side and another convex surface facing the image side. The eighth lens group has positive refractive power and includes a tenth lens, which is a meniscus lens having positive refractive power and has a convex surface facing the object side and a concave surface facing the image side.

[0014] In order to make the above-mentioned objects, features, and advantages of the present invention more comprehensible, the present invention will be described in detail with reference to the following embodiments and accompanying drawings. Effect of the Invention

[0015] The optical system of the present invention has a large compensation angle and a small optical system scale, but has good optical performance. [Brief description of the drawings]

[0016] [Figure 1] FIG. 2 is a lens arrangement diagram according to a first embodiment of the optical system of the present invention. [Diagram 2] FIG. 2 is a diagram showing longitudinal aberration under no vibration conditions according to the first embodiment of the optical system of the present invention. [Diagram 3] 1A to 1C are diagrams showing the field curvature and distortion of the optical system according to the first embodiment of the present invention in a state without vibration. [Figure 4] FIG. 2 is a diagram of a Modulation Transfer Function under no vibration conditions according to the first embodiment of the optical system of the present invention. [Diagram 5] 4A and 4B are diagrams illustrating the field curvature and distortion under maximum vibration compensation conditions according to the first embodiment of the optical system of the present invention; [Figure 6] FIG. 2 is a diagram of the modulation transfer function under maximum vibration compensation conditions according to the first embodiment of the optical system of the present invention; [Figure 7] FIG. 4 is a lens arrangement diagram according to a second embodiment of the optical system of the present invention. [Figure 8] FIG. 13 shows longitudinal aberration under no vibration conditions according to a second embodiment of the optical system of the present invention. [Figure 9] 6A and 6B are diagrams illustrating the field curvature and distortion under no vibration conditions according to the second embodiment of the optical system of the present invention; [Figure 10] FIG. 4 is a modulation transfer function diagram of the second embodiment of the optical system of the present invention under no vibration conditions. [Figure 11] FIG. 13 is a lens arrangement diagram according to a third embodiment of the optical system of the present invention. [Figure 12] FIG. 13 is a diagram showing longitudinal aberration under no vibration conditions according to a third embodiment of the optical system of the present invention. [Figure 13]13A and 13B are diagrams illustrating the field curvature and distortion under no vibration conditions according to the third embodiment of the optical system of the present invention. [Figure 14] FIG. 11 is a modulation transfer function diagram of the third embodiment of the optical system of the present invention under no vibration conditions. [Figure 15] 11A and 11B are diagrams showing the field curvature and distortion under maximum vibration compensation conditions according to the third embodiment of the optical system of the present invention; [Figure 16] FIG. 13 is a diagram of the modulation transfer function under maximum vibration compensation conditions according to the third embodiment of the optical system of the present invention; [Figure 17] FIG. 13 is a lens arrangement diagram according to a fourth embodiment of the optical system of the present invention. [Figure 18] FIG. 13 is a diagram showing longitudinal aberration under no vibration conditions according to a fourth embodiment of the optical system of the present invention. [Figure 19] 13A and 13B are diagrams showing the field curvature and distortion under no vibration conditions according to a fourth embodiment of the optical system of the present invention; [Figure 20] FIG. 11 is a modulation transfer function diagram under no vibration conditions according to a fourth embodiment of the optical system of the present invention; [Figure 21] 11A and 11B are diagrams showing the field curvature and distortion under maximum vibration compensation conditions according to a fourth embodiment of the optical system of the present invention; [Figure 22] FIG. 11 is a diagram of the modulation transfer function under maximum vibration compensation conditions according to a fourth embodiment of the optical system of the present invention; [Diagram 23] FIG. 13 is a lens arrangement diagram according to a fifth embodiment of the optical system of the present invention. [Figure 24] FIG. 13 is a diagram showing longitudinal aberration under no vibration conditions according to a fifth embodiment of the optical system of the present invention. [Diagram 25] 13A and 13B are diagrams showing the field curvature and distortion under no vibration conditions according to a fifth embodiment of the optical system of the present invention; [Figure 26] FIG. 13 is a modulation transfer function diagram under no vibration conditions according to a fifth embodiment of the optical system of the present invention; [Figure 27]13A and 13B are diagrams showing the field curvature and distortion under maximum vibration compensation conditions according to a fifth embodiment of the optical system of the present invention; [Figure 28] FIG. 13 is a diagram of the modulation transfer function under maximum vibration compensation conditions according to a fifth embodiment of the optical system of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] The present invention provides an optical system, comprising an objective lens module having a refractive power and including a first lens group, a second lens group, a third lens group, a fourth lens group and a fifth lens group, an image inverting module and an eyepiece lens module. The objective lens module, the image inverting module and the eyepiece lens module are arranged in order from an object side to an image side along an optical axis. The first lens group, the second lens group, the third lens group, the fourth lens group and the fifth lens group are arranged in order from an object side to an image side along the optical axis. The optical system satisfies the following condition: 0.45≦LG4D / LG1D≦0.8, where LG4D is the optical effective diameter of the fourth lens group and LG1D is the optical effective diameter of the first lens group.

[0018] Referring to Tables 1, 3, 5, 7, and 9, Tables 1, 3, 5, 7, and 9 are correlation parameter tables of each lens according to the first to fifth embodiments of the optical system of the present invention, respectively.

[0019] 1, 7, 11, 17, and 23 are diagrams showing lens arrangements according to the first, second, third, fourth, and fifth embodiments of the optical system of the present invention, respectively. The optical system 1 includes an objective lens module LG1OBJ, an image inversion module LG1PS, and an eyepiece lens module LG1EYE. The objective lens module LG1OBJ includes a first lens group LG11, a second lens group LG12, a third lens group LG13, a fourth lens group LG14, and a fifth lens group LG15. The first lens group LG11 includes a first lens L11 and a second lens L12. The second lens group LG12 includes a third lens L13. The third lens group LG13 includes a fourth lens L14. The fourth lens group LG14 includes a fifth lens L15. The fifth lens group LG15 includes a sixth lens L16 and an eleventh lens L111. The image inversion module LG1PS has a first prism P11 and a second prism P12. The eyepiece module LG1EYE has a sixth lens group LG16, a seventh lens group LG17, and an eighth lens group LG18. The sixth lens group LG16 has a seventh lens L17 and an eighth lens L18. The seventh lens group LG17 has a ninth lens L19. The eighth lens group LG18 has a tenth lens L110. The optical system 2 has an objective lens module LG2OBJ, an image inversion module LG2PS, and an eyepiece module LG2EYE. The objective lens module LG2OBJ has a first lens group LG21, a second lens group LG22, a third lens group LG23, a fourth lens group LG24, and a fifth lens group LG25. The first lens group LG21 has a first lens L21 and a second lens L22. The second lens group LG22 has a third lens L23. The third lens group LG23 has a fourth lens L24. The fourth lens group LG24 has a fifth lens L25. The fifth lens group LG25 has a sixth lens L26 and an eleventh lens L211. The image inversion module LG2PS has a first prism P21 and a second prism P22. The eyepiece module LG2EYE has a sixth lens group LG26, a seventh lens group LG27, and an eighth lens group LG28.The sixth lens group LG26 has a seventh lens L27 and an eighth lens L28. The seventh lens group LG27 has a ninth lens L29. The eighth lens group LG28 has a tenth lens L210. The optical system 3 has an objective lens module LG3OBJ, an image inversion module LG3PS, and an eyepiece lens module LG3EYE. The objective lens module LG3OBJ has a first lens group LG31, a second lens group LG32, a third lens group LG33, a fourth lens group LG34, and a fifth lens group LG35. The first lens group LG31 has a first lens L31 and a second lens L32. The second lens group LG32 has a third lens L33. The third lens group LG33 has a fourth lens L34. The fourth lens group LG34 has a fifth lens L35. The fifth lens group LG35 has a sixth lens L36 and an eleventh lens L311. The image inversion module LG3PS has a first prism P31 and a second prism P32. The eyepiece module LG3EYE has a sixth lens group LG36, a seventh lens group LG37 and an eighth lens group LG38. The sixth lens group LG36 has a seventh lens L37 and an eighth lens L38. The seventh lens group LG37 has a ninth lens L39. The eighth lens group LG38 has a tenth lens L310. The optical system 4 has an objective lens module LG4OBJ, an image inversion module LG4PS and an eyepiece module LG4EYE. The objective lens module LG4OBJ has a first lens group LG41, a second lens group LG42, a third lens group LG43, a fourth lens group LG44 and a fifth lens group LG45. The first lens group LG41 has a first lens L41 and a second lens L42. The second lens group LG42 has a third lens L43 and an eleventh lens L411. The third lens group LG43 has a fourth lens L44. The fourth lens group LG44 has a fifth lens L45. The fifth lens group LG45 has a sixth lens L46. The image inversion module LG4PS has a first prism P41 and a second prism P42. The eyepiece module LG4EYE has a sixth lens group LG46, a seventh lens group LG47, and an eighth lens group LG48.The sixth lens group LG46 includes a seventh lens L47 and an eighth lens L48. The seventh lens group LG47 includes a ninth lens L49. The eighth lens group LG48 includes a tenth lens L410. The optical system 5 includes an objective lens module LG5OBJ, an image inversion module LG5PS, and an eyepiece lens module LG5EYE. The objective lens module LG5OBJ includes a first lens group LG51, a second lens group LG52, a third lens group LG53, a fourth lens group LG54, and a fifth lens group LG55. The first lens group LG51 includes a first lens L51 and a second lens L52. The second lens group LG52 includes a third lens L53. The third lens group LG53 includes a third lens L54. The fourth lens group LG54 includes a fifth lens L55. The fifth lens group LG55 has a sixth lens L56 and an eleventh lens L511. The image inversion module LG5PS has a first prism P51 and a second prism P52. The eyepiece module LG5EYE has a sixth lens group LG56, a seventh lens group LG57 and an eighth lens group LG58. The sixth lens group LG56 has a seventh lens L57 and an eighth lens L58. The seventh lens group LG57 has a ninth lens L59. The eighth lens group LG58 has a tenth lens L510.

[0020] The first lens group LG11, LG21, LG31, LG41, and LG51 have positive refractive power. The first lenses L11, L21, L31, L41, and L51 are made of glass material, the object side surfaces S11, S21, S31, S41, and S51 are convex surfaces, and the object side surfaces S11, S21, S31, S41, and S51 and the image side surfaces S12, S22, S32, S42, and S52 are all spherical surfaces. The second lenses L12, L22, L32, L42, and L52 are made of glass material, and the object side surfaces S12, S22, S32, S42, and S52 and the image side surfaces S13, S23, S33, S43, and S53 are all spherical surfaces. The first lenses L11, L21, L31, L41, and L51 are fixed to the second lenses L12, L22, L32, L42, and L52 by cement, respectively. The second lens groups LG12, LG22, LG32, LG42, and LG52 can move along the optical axes OA1, OA2, OA3, OA4, and OA5, so that the optical systems 1, 2, 3, 4, and 5 can be focused. The third lenses L13, L23, L33, L43, and L53 are made of glass material, and the image-side surfaces S15, S25, S35, S45, and S55 are concave surfaces, and the object-side surfaces S14, S24, S34, S44, and S54 and the image-side surfaces S15, S25, S35, S45, and S55 are all spherical surfaces. The third lens group LG13, LG23, LG33, LG43, and LG53 have positive refractive power. The fourth lens group L14, L24, L34, L44, and L54 have positive refractive power and are made of glass material. The object side surface S16, S26, S36, S46, and S56 are convex surfaces, and the object side surface S16, S26, S36, S46, and S56 and the image side surface S17, S27, S37, S47, and S57 are all spherical surfaces. The fourth lens group LG14, LG24, LG34, LG44, and LG54 have negative refractive power. The fourth lens groups LG14, LG24, LG34, LG44, LG54 can move along a direction perpendicular to the optical axes OA1, OA2, OA3, OA4, OA5, so that the optical systems 1, 2, 3, 4, 5 can achieve optical image stabilization.The fifth lenses L15, L25, L35, L45, and L55 are biconcave lenses having negative refractive power and are formed of glass material. The object-side surfaces S18, S28, S38, S48, and S58 are concave surfaces, the image-side surfaces S19, S29, S39, S49, and S59 are concave surfaces, and the object-side surfaces S18, S28, S38, S48, and S58 and the image-side surfaces S19, S29, S39, S49, and S59 are all spherical surfaces. The sixth lenses L16, L26, L36, L46, and L56 have negative refractive power and are made of glass, the object side surfaces S110, S210, S310, S411, and S510 are concave surfaces, and the object side surfaces S110, S210, S310, S411, and S510 and the image side surfaces S111, S211, S311, S412, and S511 are all spherical surfaces. The first prisms P11, P21, P31, P41, and P51 are made of glass, the object side surfaces S113, S213, S313, S413, and S514 are flat surfaces, and the image side surfaces S114, S214, S314, S414, and S515 are flat surfaces. The second prisms P12, P22, P32, P42, and P52 are formed of a glass material, the object sides S115, S215, S315, S415, and S516 are flat, and the image sides S116, S216, S316, S416, and S517 are flat. The seventh lenses L17, L27, L37, L47, and L57 are biconcave lenses having negative refractive power and are formed of glass material. The object-side surfaces S118, S218, S318, S418, and S519 are concave surfaces, the image-side surfaces S119, S219, S319, S419, and S520 are concave surfaces, and the object-side surfaces S118, S218, S318, S418, and S519 and the image-side surfaces S119, S219, S319, S419, and S520 are all spherical surfaces.The eighth lenses L18, L28, L38, L48, and L58 are biconvex lenses having positive refractive power, and are made of glass material, the object side surfaces S119, S219, S319, S419, and S520 are convex surfaces, the image side surfaces S120, S220, S320, S420, and S521 are convex surfaces, and the object side surfaces S119, S219, S319, S419, and S520 and the image side surfaces S120, S220, S320, S420, and S521 are all spherical surfaces. The seventh lenses L17, L27, L37, L47, and L57 are fixed to the eighth lenses L18, L28, L38, L48, and L58, respectively, with cement. The seventh lens group LG17, LG27, LG37, LG47, and LG57 have positive refractive power. The ninth lens group L19, L29, L39, L49, and L59 are biconvex lenses having positive refractive power, and are made of glass material. The object side surface S121, S221, S321, S421, and S522 are convex surfaces, the image side surface S122, S222, S322, S422, and S523 are convex surfaces, and the object side surface S121, S221, S321, S421, and S522 and the image side surface S122, S222, S322, S422, and S523 are all spherical surfaces. The eighth lens group LG18, LG28, LG38, L48, and LG58 have positive refractive power. The tenth lenses L110, L210, L310, L410, and L510 have positive refractive power and are made of glass, the object-side surfaces S123, S223, S323, S423, and S524 are convex surfaces, and the object-side surfaces S123, S223, S323, S423, and S524 and the image-side surfaces S124, S224, S324, S424, and S525 are all spherical surfaces.

[0021] The above-mentioned image inversion module can rotate the direction of the image from the objective lens module. For example, if the image from the objective lens module is an inverted image, after passing through the image inversion module, the image can be rotated to an upright image, so the image inversion module can also be called an upright optical module.

[0022] In addition, the optical systems 1, 2, 3, 4, and 5 satisfy at least one of the following conditions:

[0023] 0.45 ≦ LG4D / LG1D ≦ 0.8; (1)

[0024] 0.015 mm -1 ≦1 / fG3 ≦0.045 mm -1 ; (2)

[0025] 0.045 mm -1 ≦│1 / fG4│≦ 0.07 mm -1 ; (3)

[0026] 0.35 ≦│fG4 / fG3│≦ 0.75; (4)

[0027] 0.15 ≦ fG1 / f ≦ 1.6; (5)

[0028] LG1D is the optical effective diameter of the first lens group LG11, LG21, LG31, LG41, and LG51 in the first to fifth embodiments, LG4D is the optical effective diameter of the fourth lens group LG14, LG24, LG34, LG44, and LG54 in the first to fifth embodiments, fG1 is the effective focal length of the first lens group LG11, LG21, LG31, LG41, and LG51 in the first to fifth embodiments, and fG3 is the optical effective diameter of the fourth lens group LG14, LG24, LG34, LG44, and LG54 in the first to fifth embodiments. fG4 is the effective focal length of the third lens group LG13, LG23, LG33, LG43, and LG53 in the first to fifth embodiments, fG4 is the effective focal length of the fourth lens group LG14, LG24, LG34, LG44, and LG54 in the first to fifth embodiments, and f is the effective focal length of the objective lens modules LG1OBJ, LG20BJ, LG30BJ, LG40BJ, and LG50BJ in the first to fifth embodiments. The optical systems 1, 2, 3, 4, and 5 can effectively correct aberrations and effectively correct chromatic aberration.

[0029] The first lens group is formed by cementing the first lens and the second lens, and can effectively correct the axial chromatic aberration. The third lens group has a large optical power (positive) which can effectively improve the deviation ability of the light beam, so that the light beam entering the third lens group can be quickly converged to the fourth lens group with a small aperture. The aperture of the fourth lens group is only half that of the first lens group, and the volume is small and compact, and its optical power is large (negative), so that the light beam entering the fourth lens group can be quickly diverged, and the optical image stabilization during movement is achieved, the moving distance required for the optical image stabilization is short, and it has a large compensation angle. The optical power is the reciprocal of the effective focal length, and a large optical power refers to a short effective focal length.

[0030] A detailed description of the optical system according to the first embodiment of the present invention is as follows. Referring to FIG. 1, the optical system 1 includes an objective lens module LG1OBJ, an image inversion module LG1PS, and an eyepiece lens module LG1EYE, which are arranged from the object side to the image side along the optical axis OA1 in this order. The objective lens module LG1OBJ includes a first lens group LG11, a second lens group LG12, a third lens group LG13, a fourth lens group LG14, and a fifth lens group LG15, which are arranged from the object side to the image side along the optical axis OA1 in this order. The first lens group LG11 includes a first lens L11 and a second lens L12, which are arranged from the object side to the image side along the optical axis OA1 in this order. The first lens L11 and the second lens L12 are fixed by cement. The second lens group LG12 includes a third lens L13. The third lens group LG13 includes a fourth lens L14. The fourth lens group LG14 includes a fifth lens L15. The fifth lens group LG15 has a sixth lens L16 and an eleventh lens L111 arranged in order from the object side to the image side along the optical axis OA1. The sixth lens L16 and the eleventh lens L110 are fixed with cement. The image inversion module LG1PS has a first prism P11 and a second prism P12 arranged in order from the object side to the image side along the optical axis OA1. The eyepiece module LG1EYE has a sixth lens group LG16, a seventh lens group LG17, and an eighth lens group LG18 arranged in order from the object side to the image side along the optical axis OA1. The sixth lens group LG16 has a seventh lens L17 and an eighth lens L18 arranged in order from the object side to the image side along the optical axis OA1. The seventh lens L17 and the eighth lens L18 are fixed with cement. The seventh lens group LG17 has a ninth lens L19. The eighth lens group LG18 includes a tenth lens L110. During imaging, a light ray from the object side passes through the objective lens module LG1OBJ and the image inversion module LG1PS in order to form an image on the focal plane S117, and then passes through the eyepiece lens module LG1EYE to form an image on the image plane IMA1.The second lens group LG12 can move along the optical axis OA1, so that the optical system 1 can focus. The fourth lens group LG14 can move along a direction perpendicular to the optical axis OA1, and its moving distance is 0.6 mm, so that the optical system 1 can achieve optical image stabilization, and the compensation angle of the optical axis vibration can reach ±0.8 degrees.

[0031] According to paragraphs 1 to 5 of the Detailed Description of the Invention, the first lens L11 is a biconvex lens having positive refractive power, and the image side surface S12 is a convex surface. The second lens L12 is a biconcave lens having negative refractive power, and the object side surface S12 is a concave surface, and the image side surface S13 is a concave surface. The second lens group LG12 has positive refractive power, the third lens L13 is a meniscus lens having positive refractive power, and the object side surface S14 is a convex surface. The fourth lens L14 is a meniscus lens, and the image side surface S17 is a concave surface. The fifth lens group LG15 has a negative refractive power, the sixth lens L16 is a biconcave lens, the image side surface S111 is a concave surface, the eleventh lens L111 is a biconvex lens, the object side surface S111 is a convex surface, the image side surface S112 is a convex surface, and the sixth lens L16 and the eleventh lens L111 are fixed with cement. The sixth lens group LG16 has a positive refractive power. The tenth lens L110 is a plano-convex lens, and the image side surface S124 is a flat surface.

[0032] By the design of the objective lens module LG1OBJ, the image inversion module LG1PS, and the eyepiece lens module LG1EYE, and by satisfying at least one of conditions (1)-(5), the optical system 1 can effectively correct aberrations and effectively correct chromatic aberration.

[0033] Table 1 is a table of relative parameters for each lens in the optical system 1 of FIG.

[0034] [Table 1]

[0035] Table 2 shows the correlation parameter values ​​according to the optical system 1 of the first embodiment and the corresponding calculated values ​​of the conditions (1)-(5). It can be seen from Table 2 that the optical system 1 of the first embodiment satisfies the conditions (1)-(5). When the refractive power and surface shape of each lens match those in Table 1 and the conditions (1)-(5) are satisfied, the preferred embodiment of the present invention is achieved.

[0036] [Table 2]

[0037] In addition, the optical performance of the optical system 1 of the first embodiment can also meet the requirements. From FIG. 2, it can be seen that the optical system 1 of the first embodiment has a longitudinal aberration between 0 mm and 0.4 mm under a condition without vibration. From FIG. 3, it can be seen that the optical system 1 of the first embodiment has a field curvature between -0.4 mm and 1.2 mm and a distortion between 0% and 6% under a condition without vibration. From FIG. 4, it can be seen that the optical system 1 of the first embodiment has a modulation transfer function between 0 and 1.0 under a condition without vibration. From FIG. 5, it can be seen that the optical system 1 of the first embodiment has a field curvature between -1.2 mm and 0.2 mm and a distortion between 0% and 6% under a condition with maximum vibration compensation. From FIG. 6, it can be seen that the optical system 1 of the first embodiment has a modulation transfer function between 0 and 1.0 under a condition with maximum vibration compensation. It is clear that the optical system 1 of the first embodiment effectively corrects the longitudinal aberration, field curvature, and distortion under the condition of no vibration or maximum vibration compensation, and the image resolution also meets the requirements, so that good optical performance is achieved.

[0038] A detailed description of the optical system according to the second embodiment of the present invention is as follows. Referring to FIG. 7, the optical system 2 includes an objective lens module LG2OBJ, an image inversion module LG2PS, and an eyepiece lens module LG2EYE, which are arranged from the object side to the image side along the optical axis OA2 in this order. The objective lens module LG2OBJ includes a first lens group LG21, a second lens group LG22, a third lens group LG23, a fourth lens group LG24, and a fifth lens group LG25, which are arranged from the object side to the image side along the optical axis OA2 in this order. The first lens group LG21 includes a first lens L21 and a second lens L22, which are arranged from the object side to the image side along the optical axis OA2 in this order. The first lens L21 and the second lens L22 are fixed with cement. The second lens group LG22 includes a third lens L23. The third lens group LG23 includes a fourth lens L24. The fourth lens group LG24 includes a fifth lens L25. The fifth lens group LG25 has a sixth lens L26 and an eleventh lens L211 arranged in order from the object side to the image side along the optical axis OA2. The sixth lens L26 and the eleventh lens L211 are fixed with cement. The image inversion module LG2PS has a first prism P21 and a second prism P22 arranged in order from the object side to the image side along the optical axis OA2. The eyepiece module LG2EYE has a sixth lens group LG26, a seventh lens group LG27, and an eighth lens group LG28 arranged in order from the object side to the image side along the optical axis OA2. The sixth lens group LG26 has a seventh lens L27 and an eighth lens L28 arranged in order from the object side to the image side along the optical axis OA2. The seventh lens L27 and the eighth lens L28 are fixed with cement. The seventh lens group LG27 has a ninth lens L29. The eighth lens group LG28 includes a tenth lens L210. During imaging, a light ray from the object side passes through the objective lens module LG2OBJ and the image inversion module LG2PS in order to form an image on the focal plane S217, and then passes through the eyepiece lens module LG2EYE to form an image on the image plane IMA2.The second lens group LG22 can move along the optical axis OA2, so that the optical system 2 can focus. The fourth lens group LG24 can move along a direction perpendicular to the optical axis OA2, and its moving distance is 0.6 mm, so that the optical system 2 can achieve optical image stabilization, and the compensation angle of the optical axis vibration can reach ±0.8 degrees.

[0039] According to the first to fifth paragraphs of the Detailed Description of the Invention, The first lens L21 is a biconvex lens having positive refractive power, and the image side surface S22 is a convex surface. The second lens L22 is a biconcave lens having negative refractive power, and the object side surface S22 is a concave surface and the image side surface S23 is a concave surface. The second lens group LG22 has positive refractive power, and the third lens L23 is a meniscus lens having positive refractive power, and the object side surface S24 is a convex surface. The fourth lens L24 is a meniscus lens, and the image side surface S27 is a concave surface. The fifth lens group LG25 has negative refractive power, and the sixth lens L26 is a biconcave lens, and the image side surface S211 is a concave surface, and the eleventh lens L211 is a biconvex lens having positive refractive power, and the object side surface S211 is a convex surface and the image side surface S212 is a convex surface. The sixth lens L26 and the eleventh lens L211 are fixed with cement. The sixth lens group LG26 has a positive refractive power. The tenth lens L210 is a plano-convex lens, and the image side surface S224 is a flat surface.

[0040] Due to the design of the objective lens module LG2OBJ, the image inversion module LG2PS, and the eyepiece lens module LG2EYE, and because at least one of conditions (1)-(5) is satisfied, the optical system 2 effectively corrects aberrations and effectively corrects chromatic aberration.

[0041] Table 3 is a table of relative parameters for each lens in the optical system 2 of FIG.

[0042] [Table 3]

[0043] Table 4 shows the correlation parameter values ​​according to the optical system 2 of the second embodiment and the corresponding calculated values ​​of the conditions (1)-(5). It can be seen from Table 4 that the optical system 2 of the second embodiment satisfies the conditions (1)-(5). When the refractive power and surface shape of each lens conform to Table 3 and the conditions (1)-(5) are satisfied, the preferred embodiment of the present invention is achieved.

[0044] [Table 4]

[0045] In addition, the optical performance of the optical system 2 of the second embodiment can also reach the requirement. From FIG. 8, it can be seen that the optical system 2 of the second embodiment has a longitudinal aberration between -0.05mm and 0.25mm under no vibration conditions. From FIG. 9, it can be seen that the optical system 2 of the second embodiment has a field curvature between -0.4mm and 1.2mm and a distortion between 0% and 6% under no vibration conditions. From FIG. 10, it can be seen that the optical system 2 of the second embodiment has a modulation transfer function between 0 and 1.0 under no vibration conditions. Under maximum vibration compensation conditions, the field curvature, distortion, and modulation transfer function diagrams of the optical system 2 of the second embodiment are similar to those of the first embodiment, so the drawings are omitted, and the optical performance can also meet the requirement. It is clear that the optical system 2 of the second embodiment effectively corrects the longitudinal aberration, field curvature, and distortion under the condition of no vibration or maximum vibration compensation, and the image resolution also meets the requirements, so that good optical performance is achieved.

[0046] A detailed description of the optical system according to the third embodiment of the present invention is as follows. Referring to FIG. 11, the optical system 3 includes an objective lens module LG3OBJ, an image inversion module LG3PS, and an eyepiece lens module LG3EYE, which are arranged from the object side to the image side along the optical axis OA3 in order. The objective lens module LG3OBJ includes a first lens group LG31, a second lens group LG32, a third lens group LG33, a fourth lens group LG34, and a fifth lens group LG35, which are arranged from the object side to the image side along the optical axis OA3 in order. The first lens group LG31 includes a first lens L31 and a second lens L32, which are arranged from the object side to the image side along the optical axis OA3 in order. The first lens L31 and the second lens L32 are fixed by cement. The second lens group LG32 includes a third lens L33. The third lens group LG33 includes a fourth lens L34. The fourth lens group LG34 includes a fifth lens L35. The fifth lens group LG35 has a sixth lens L36 and an eleventh lens L311, and is arranged in order from the object side to the image side along the optical axis OA3. The sixth lens L36 and the eleventh lens L311 are fixed with cement. The image inversion module LG3PS has a first prism P31 and a second prism P32, and is arranged in order from the object side to the image side along the optical axis OA3. The eyepiece module LG3EYE has a sixth lens group LG36, a seventh lens group LG37, and an eighth lens group LG38, and is arranged in order from the object side to the image side along the optical axis OA3. The sixth lens group LG36 has a seventh lens L37 and an eighth lens L38, and is arranged in order from the object side to the image side along the optical axis OA3. The seventh lens L37 and the eighth lens L38 are fixed with cement. The seventh lens group LG37 has a ninth lens L39. The eighth lens group LG38 includes a tenth lens L310. During imaging, a light ray from the object side passes through the objective lens module LG3OBJ and the image inversion module LG3PS in order to form an image on the focal plane S317, and then passes through the eyepiece lens module LG3EYE to form an image on the image plane IMA3.The second lens group LG32 can move along the optical axis OA3, so that the optical system 3 can focus. The fourth lens group LG34 can move along a direction perpendicular to the optical axis OA3, and its moving distance is 0.6 mm, so that the optical system 3 can achieve optical image stabilization, and the compensation angle of the optical axis vibration can reach ±0.803 degrees.

[0047] According to the first to fifth paragraphs of the Detailed Description of the Invention, The first lens L31 is a meniscus lens having negative refractive power, and the image side surface S32 is a concave surface. The second lens L32 is a meniscus lens having positive refractive power, and the object side surface S32 is a convex surface, and the image side surface S33 is a concave surface. The second lens group LG32 has positive refractive power, and the third lens L33 is a meniscus lens having positive refractive power, and the object side surface S34 is a convex surface. The fourth lens L34 is a biconvex lens, and the image side surface S37 is a convex surface. The fifth lens group LG35 has positive refractive power, and the sixth lens L36 is a biconcave lens, and the image side surface S311 is a concave surface, and the eleventh lens L311 is a biconvex lens having positive refractive power, and the object side surface S311 is a convex surface, and the image side surface S312 is a convex surface. The sixth lens L36 and the eleventh lens L311 are fixed with cement. The sixth lens group LG36 has positive refractive power, the tenth lens L310 is a plano-convex lens, and the image side surface S324 is a flat surface.

[0048] Due to the design of the objective lens module LG3OBJ, the image inversion module LG3PS, and the eyepiece lens module LG3EYE, and because at least one of conditions (1)-(5) is satisfied, the optical system 3 effectively corrects aberrations and effectively corrects chromatic aberration.

[0049] Table 5 is a table of relative parameters for each lens in the optical system 3 of FIG.

[0050] [Table 5]

[0051] Table 6 shows the correlation parameter values ​​according to the optical system 3 of the third embodiment and the corresponding calculated values ​​of the conditions (1)-(5). It can be seen from Table 6 that the optical system 3 of the third embodiment satisfies the conditions (1)-(5). When the refractive power and surface shape of each lens conform to Table 5 and the conditions (1)-(5) are satisfied, the preferred embodiment of the present invention is achieved.

[0052] [Table 6]

[0053] In addition, the optical performance of the optical system 3 of the third embodiment can also achieve the required results. From FIG. 12, it can be seen that the optical system 3 of the third embodiment has a longitudinal aberration between -0.1 mm and 0.4 mm under no vibration conditions. From FIG. 13, it can be seen that the optical system 3 of the third embodiment has a field curvature between -0.4 mm and 0.6 mm and a distortion between 0% and 9% under no vibration conditions. From FIG. 14, it can be seen that the optical system 3 of the third embodiment has a modulation transfer function between 0 and 1.0 under no vibration conditions. From FIG. 15, it can be seen that the optical system 3 of the third embodiment has a field curvature between -0.7 mm and 0.3 mm and a distortion between 0% and 9% under maximum vibration compensation conditions. From FIG. 16, it can be seen that the optical system 3 of the third embodiment has a modulation transfer function between 0 and 1.0 under maximum vibration compensation conditions. In the optical system 3 of the third embodiment, under the condition of no vibration or maximum vibration compensation, the longitudinal aberration, the field curvature and the distortion are effectively corrected, and the image resolution meets the requirements, so that good optical performance is achieved.

[0054] A detailed description of the optical system according to the fourth embodiment of the present invention is as follows. Referring to FIG. 17, the optical system 4 includes an objective lens module LG4OBJ, an image inversion module LG4PS, and an eyepiece lens module LG4EYE, which are arranged from the object side to the image side along the optical axis OA4. The objective lens module LG4OBJ includes a first lens group LG41, a second lens group LG42, a third lens group LG43, a fourth lens group LG44, and a fifth lens group LG45, which are arranged from the object side to the image side along the optical axis OA4. The first lens group LG41 includes a first lens L41 and a second lens L42, which are arranged from the object side to the image side along the optical axis OA4. The first lens L41 and the second lens L42 are fixed with cement. The second lens group LG42 includes a third lens L43 and an eleventh lens L411, which are arranged from the object side to the image side along the optical axis OA4. The third lens L43 and the eleventh lens L411 are fixed with cement. The third lens group LG43 includes a fourth lens L44. The fourth lens group LG44 includes a fifth lens L45. The fifth lens group LG45 includes a sixth lens L46. The image inversion module LG4PS includes a first prism P41 and a second prism P42 arranged in order from the object side to the image side along the optical axis OA4. The eyepiece module LG4EYE includes a sixth lens group LG46, a seventh lens group LG47, and an eighth lens group LG48 arranged in order from the object side to the image side along the optical axis OA4. The sixth lens group LG46 includes a seventh lens L47 and an eighth lens L48 arranged in order from the object side to the image side along the optical axis OA4. The seventh lens L47 and the eighth lens L48 are fixed with cement. The seventh lens group LG47 includes a ninth lens L49. The eighth lens group LG48 includes a tenth lens L410. During imaging, a light ray from the object side passes through the objective lens module LG4OBJ and the image inversion module LG4PS in order to form an image on the focal plane S417, and then passes through the eyepiece lens module LG4EYE to form an image on the image plane IMA4.The second lens group LG42 can move along the optical axis OA4, so that the optical system 4 can focus. The fourth lens group LG44 can move along a direction perpendicular to the optical axis OA4, and its moving distance is 0.6 mm, so that the optical system 4 can achieve optical image stabilization, and the compensation angle of the optical axis vibration can reach ±0.74 degrees.

[0055] According to paragraphs 1 to 5 of the [Description of the Preferred Embodiments], the first lens L41 is a meniscus lens having negative refractive power, and the image side surface S42 is a concave surface. The second lens L42 is a biconvex lens having positive refractive power, and the object side surface S42 is a convex surface and the image side surface S43 is a convex surface. The second lens group LG42 has negative refractive power, the third lens L43 is a biconcave lens having negative refractive power, and the object side surface S44 is a concave surface, and the eleventh lens L411 is a biconvex lens having positive refractive power, and the object side surface S46 is a convex surface and the image side surface S47 is a convex surface. The third lens L43 and the eleventh lens L411 are fixed with cement. The fourth lens L44 is a biconvex lens, and the image side surface S48 is a convex surface. The fifth lens group LG45 has negative refractive power, the sixth lens L46 is a meniscus lens with the image side surface S412 being convex, the sixth lens group LG46 has negative refractive power, the tenth lens L410 is a meniscus lens with the image side surface S424 being concave,

[0056] Due to the design of the objective lens module LG4OBJ, the image inversion module LG4PS, and the eyepiece lens module LG4EYE, and because at least one of conditions (1)-(5) is satisfied, the optical system 4 effectively corrects aberrations and effectively corrects chromatic aberration.

[0057] Table 7 is a table of relative parameters for each lens in the optical system 4 of FIG.

[0058] [Table 7]

[0059] Table 8 shows the correlation parameter values ​​according to the optical system 4 of the fourth embodiment and the corresponding calculated values ​​of the conditions (1)-(5). It can be seen from Table 8 that the optical system 4 of the fourth embodiment satisfies the conditions (1)-(5). When the refractive power and surface shape of each lens are in accordance with Table 7 and the conditions (1)-(5) are satisfied, the preferred embodiment of the present invention is achieved.

[0060] [Table 8]

[0061] In addition, the optical performance of the optical system 4 of the fourth embodiment can also achieve the required results. From FIG. 18, it can be seen that the optical system 4 of the fourth embodiment has a longitudinal aberration between -0.12mm and 0.12mm under no vibration conditions. From FIG. 19, it can be seen that the optical system 4 of the fourth embodiment has a field curvature between -0.3mm and 0.2mm and a distortion between 0% and 10% under no vibration conditions. From FIG. 20, it can be seen that the optical system 4 of the fourth embodiment has a modulation transfer function between 0 and 1.0 under no vibration conditions. From FIG. 21, it can be seen that the optical system 4 of the fourth embodiment has a field curvature between -1.2mm and 0mm and a distortion between 0% and 10% under maximum vibration compensation conditions. From FIG. 22, it can be seen that the optical system 4 of the fourth embodiment has a modulation transfer function between 0 and 1.0 under maximum vibration compensation conditions. It is evident that the optical system 4 of the fourth embodiment effectively corrects the longitudinal aberration, field curvature, and distortion under the condition of no vibration or maximum vibration compensation, and the image resolution also meets the requirements, so that good optical performance is achieved.

[0062] A detailed description of the optical system according to the fifth embodiment of the present invention is as follows. Referring to FIG. 23, the optical system 5 includes an objective lens module LG5OBJ, an image inversion module LG5PS, and an eyepiece lens module LG5EYE, which are arranged from the object side to the image side along the optical axis OA5. The objective lens module LG5OBJ includes a first lens group LG51, a second lens group LG52, a third lens group LG53, a fourth lens group LG54, and a fifth lens group LG55, which are arranged from the object side to the image side along the optical axis OA5. The first lens group LG51 includes a first lens L51 and a second lens L52, which are arranged from the object side to the image side along the optical axis OA5. The first lens L51 and the second lens L52 are fixed by cement. The second lens group LG52 includes a third lens L53. The third lens group LG53 includes a third lens L54. The fourth lens group LG54 includes a fifth lens L55. The fifth lens group LG55 has a sixth lens L56 and an eleventh lens L511, and is arranged in order from the object side to the image side along the optical axis OA5. The image inversion module LG5PS has a first prism P51 and a second prism P52, and is arranged in order from the object side to the image side along the optical axis OA5. The eyepiece module LG5EYE has a sixth lens group LG56, a seventh lens group LG57, and an eighth lens group LG58, and is arranged in order from the object side to the image side along the optical axis OA5. The sixth lens group LG56 has a seventh lens L57 and an eighth lens L58, and is arranged in order from the object side to the image side along the optical axis OA5. The seventh lens L57 and the eighth lens L58 are fixed with cement. The seventh lens group LG57 has a ninth lens L59. The eighth lens group LG58 has a tenth lens L510. During imaging, light rays from the object side pass through the objective lens module LG5OBJ and the image inversion module LG5PS in order to form an image on the focal plane S518, and also pass through the eyepiece lens module LG5EYE to form an image on the image plane IMA5.The second lens group LG52 can move along the optical axis OA5, so that the optical system 5 can focus. The fourth lens group LG54 can move along a direction perpendicular to the optical axis OA5, and its moving distance is 0.6 mm, so that the optical system 5 can achieve optical image stabilization, and the compensation angle of the optical axis vibration can reach ±0.8 degrees.

[0063] According to paragraphs 1 to 5 of the [Description of the Invention], the first lens L51 is a biconvex lens having positive refractive power, and the image side surface S52 is a convex surface. The second lens L52 is a meniscus lens having negative refractive power. The object side surface S52 is a concave surface, and the image side surface S53 is a convex surface. The second lens group LG52 has negative refractive power, the third lens L53 is a biconcave lens having negative refractive power, and the object side surface S54 is a concave surface. The fourth lens L54 is a biconvex lens, and the image side surface S57 is a convex surface. The fifth lens group LG55 has positive refractive power, the sixth lens L56 is a meniscus lens, and the image side surface S511 is a convex surface, and the eleventh lens L511 is a biconvex lens having positive refractive power, and the object side surface S512 is a convex surface, and the image side surface S513 is a convex surface. The sixth lens group LG56 has negative refractive power. The tenth lens L510 is a meniscus lens whose image side surface S525 is concave.

[0064] Due to the design of the objective lens module LG5OBJ, the image inversion module LG5PS, and the eyepiece lens module LG5EYE, and due to at least one of the conditions (1)-(5) being satisfied, the optical system 5 effectively corrects aberrations and effectively corrects chromatic aberrations.

[0065] Table 9 is a table of relative parameters for each lens of the optical system 5 of FIG.

[0066] [Table 9]

[0067] Table 10 shows the correlation parameter values ​​according to the optical system 5 of the fifth embodiment and the corresponding calculated values ​​of the conditions (1)-(5). It can be seen from Table 10 that the optical system 5 of the fifth embodiment satisfies the conditions (1)-(5). When the refractive power and surface shape of each lens are in accordance with Table 9 and the conditions (1)-(5) are satisfied, the preferred embodiment of the present invention is achieved.

[0068] [Table 10]

[0069] In addition, the optical performance of the optical system 5 of the fifth embodiment can also achieve the required results. From FIG. 24, it can be seen that the optical system 5 of the fifth embodiment has a longitudinal aberration between -0.35 mm and 0.25 mm under no vibration conditions. From FIG. 25, it can be seen that the optical system 5 of the fifth embodiment has a field curvature between -0.4 mm and 1.0 mm and a distortion between 0% and 3% under no vibration conditions. From FIG. 26, it can be seen that the optical system 5 of the fifth embodiment has a modulation transfer function between 0 and 1.0 under no vibration conditions. From FIG. 27, it can be seen that the optical system 5 of the fifth embodiment has a field curvature between -1.3 mm and 0.1 mm and a distortion between 0% and 4% under maximum vibration compensation conditions. From FIG. 28, it can be seen that the optical system 5 of the fifth embodiment has a modulation transfer function between 0 and 1.0 under maximum vibration compensation conditions. In the optical system 5 of the fifth embodiment, under the condition of no vibration or maximum vibration compensation, the longitudinal aberration, the field curvature and the distortion are effectively corrected, and the image resolution meets the requirement, so that good optical performance is achieved.

[0070] The above optical system can effectively correct the blur of the optical image caused by the vibration of the handheld optical device, and can be applied to optical devices such as telescopes, rangefinders, and sights, and can effectively improve the image blur caused by the vibration of the user's hand. In addition, the rangefinder originally has a distance measurement function, and some telescopes and sights also have a distance measurement function. In the optical device with a distance measurement function, the laser beam emitted by its laser transmitting and receiving system first enters the image inversion module (or called the upright optical module, i.e., the prism set) of the optical system of the present invention, and then enters the objective lens module. The laser beam emitted from the objective lens module to the object and reflected by the object first passes through the objective lens module along the original path, then passes through the image inversion module (i.e., the prism set), and finally enters the receiver, which should also fall within the scope of the present invention.

[0071] Although preferred embodiments of the present invention have been disclosed as described above, these are by no means intended to limit the present invention, and anyone familiar with the art may make various modifications thereto without departing from the spirit of the present invention. [Explanation of symbols]

[0072] 1, 2, 3, 4, 5…Optical System LG1OBJ, LG2OBJ, LG3OBJ, LG4OBJ, LG5OBJ…Objective lens module LG1PS, LG2PS, LG3PS, LG4PS, LG5PS...Image inversion module LG1EYE, LG2EYE, LG3EYE, LG4EYE, LG5EYE...Eyepiece module LG11, LG21, LG31, LG41, LG51...First lens group LG12, LG22, LG32, LG42, LG52...Second lens group LG13, LG23, LG33, LG43, LG53...Third lens group LG14, LG24, LG34, LG44, LG54...Fourth lens group LG15, LG25, LG35, LG45, LG55... Fifth lens group LG16, LG26, LG36, LG46, LG56... Sixth lens group LG17, LG27, LG37, LG47, LG57...7th lens group LG18, LG28, LG38, LG48, LG58...Eighth lens group L11, L21, L31, L41, L51...First lens L12, L22, L32, L42, L52...Second lens L13, L23, L33, L43, L53...Third lens L14, L24, L34, L44, L54...Fourth lens L15, L25, L35, L45, L55... Fifth lens L16, L26, L36, L46, L56...6th lens L17, L27, L37, L47, L57...7th lens L18, L28, L38, L48, L58...8th lens L19, L29, L39, L49, L59... ninth lens L110, L210, L310, L410, L510...10th lens L111, L211, L311, L411, L511... 11th lens P11, P21, P31, P41, P51...First prism P12, P22, P32, P42, P52...Second prism OA1, OA2, OA3, OA4, OA5...Optical axis IMA1, IMA2, IMA3, IMA4, IMA5...Image surface S11, S21, S31, S41, S51...Object side S12, S22, S32, S42, S52...Image side S12, S22, S32, S42, S52…Object side S13, S23, S33, S43, S53...Image side S14, S24, S34, S44, S54…Object side S15, S25, S35, S45, S55...Image side S16, S26, S36, S47, S56…Object side S17, S27, S37, S48, S57...Image side S18, S28, S38, S49, S58…Object side S19, S29, S39, S410, S59... Image side S110, S210, S310, S411, S510... Object side S111, S211, S311, S411, S511... Image side S113, S213, S313, S413, S514…Object side S114, S214, S314, S414, S515... Image side S115, S215, S315, S415, S516... Object side S116, S216, S316, S416, S517... Image side S117, S217, S317, S417, S518…focal plane S118, S218, S318, S418, S519… Object side S119, S219, S319, S419, S520... Image side S119, S219, S319, S419, S520… Object side S120, S220, S320, S420, S521... Image side S121, S221, S321, S421, S522... Object side S122, S222, S322, S422, S523... Image side S123, S223, S323, S423, S524…Object side S124, S224, S324, S424, S525...Image side S111, S211, S311, S415, S512... Object side S112, S212, S312, S416, S513... Image side

Claims

1. 1. An optical system comprising: an objective lens module having a refractive power and including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and an eleventh lens; an image inversion module; and an eyepiece module; The objective lens module, the image inversion module, and the eyepiece lens module are arranged in order from an object side to an image side along an optical axis; the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the eleventh lens are arranged in order from the object side to the image side along the optical axis, The optical system satisfies at least one of the following conditions: 0.45≦LG4D / LG1D≦0.8; 0.015 mm －１ ≦1 / fG3≦0.045 mm －１ ; 0.045 mm －１ ≦│1 / fG4│≦0.07 mm －１ ; 0.35 ≤ |fG4 / fG3| ≤ 0.75; 0.15≦fG1 / f≦1.6 an optical system characterized in that LG4D is the optical effective diameter of the fifth lens, LG1D is the optical effective diameter of the combination of the first lens and the second lens, fG1 is the effective focal length of the combination of the first lens and the second lens, fG3 is the effective focal length of the fourth lens, fG4 is the effective focal length of the fifth lens, and f is the effective focal length of the objective lens module.

2. 1. An optical system comprising: an objective lens module having a refractive power, the objective lens module including a first lens, a second lens, a third lens, an eleventh lens, a fourth lens, a fifth lens, and a sixth lens; an image inversion module; and an eyepiece module; The objective lens module, the image inversion module, and the eyepiece lens module are arranged in order from an object side to an image side along an optical axis; the first lens and the second lens, the third lens and the eleventh lens, the fourth lens, the fifth lens, and the sixth lens are arranged in order from the object side to the image side along the optical axis, The optical system satisfies at least one of the following conditions: 0.45≦LG4D / LG1D≦0.8; 0.015 mm －１ ≦1 / fG3≦0.045 mm －１ ; 0.045 mm －１ ≦│1 / fG4│≦0.07 mm －１ ; 0.35 ≤ |fG4 / fG3| ≤ 0.75; 0.15≦fG1 / f≦1.6 an optical system characterized in that LG4D is the optical effective diameter of the fifth lens, LG1D is the optical effective diameter of the combination of the first lens and the second lens, fG1 is the effective focal length of the combination of the first lens and the second lens, fG3 is the effective focal length of the fourth lens, fG4 is the effective focal length of the fifth lens, and f is the effective focal length of the objective lens module.

3. the image inversion module includes a first prism and a second prism; the eyepiece module has a refractive power and includes a seventh lens, an eighth lens, a ninth lens, and a tenth lens; the seventh lens, the eighth lens, the ninth lens, and the tenth lens are arranged along the optical axis in the order from the object side to the image side; the combination of the first lens and the second lens has a positive refractive power; the third lens has a refractive power and a concave surface facing the image side; the fourth lens has a positive refractive power and a convex surface facing the object side; the fifth lens is a biconcave lens having negative refractive power and having a concave surface facing the object side and another concave surface facing the image side; the sixth lens has a negative refractive power and a concave surface facing the object side; the seventh lens and the eighth lens in combination have a refractive power; the ninth lens has a refractive power; the tenth lens has a refractive power, the third lens is movable along the optical axis so that the optical system is focussable; 3. The optical system of claim 1, wherein the fifth lens is movable along a direction perpendicular to the optical axis, so that the optical system can achieve optical image stabilization.

4. 2. The optical system of claim 1, wherein the sixth lens has negative refractive power and has a concave surface facing the object side, and the eleventh lens is a biconvex lens having positive refractive power and has a convex surface facing the object side and another convex surface facing the image side.

5. the eyepiece module has a refractive power and includes a seventh lens, an eighth lens, a ninth lens, and a tenth lens; the seventh lens, the eighth lens, the ninth lens, and the tenth lens are arranged along the optical axis in the order from the object side to the image side; the third lens has a positive refractive power, the third lens is a meniscus lens and has a convex surface facing the object side and a concave surface facing the image side; the fourth lens is a meniscus lens having a positive refractive power and having a convex surface facing the object side and a concave surface facing the image side; the combination of the sixth lens and the eleventh lens has a negative refractive power, the sixth lens being a biconcave lens having a negative refractive power and having a concave surface facing the object side and another concave surface facing the image side; the sixth lens and the eleventh lens are fixed with cement; the combination of the seventh lens and the eighth lens has a positive refractive power, the seventh lens is a biconcave lens having a negative refractive power and has a concave surface facing the object side and another concave surface facing the image side, the eighth lens is a biconvex lens having a positive refractive power and has a convex surface facing the object side and another convex surface facing the image side, and the seventh lens and the eighth lens are fixed with cement; the ninth lens is a biconvex lens having a positive refractive power and has a convex surface facing the object side and another convex surface facing the image side; and 5. The optical system of claim 4, wherein the tenth lens is a plano-convex lens having positive refractive power and has a convex surface facing the object side and a planar surface facing the image side.

6. the first lens is a biconvex lens having a positive refractive power and having a convex surface facing the object side and another convex surface facing the image side; the second lens is a biconcave lens having negative refractive power and having a concave surface facing the object side and another concave surface facing the image side; 6. The optical system of claim 5, wherein the first lens and the second lens are secured together by cement.

7. the eyepiece module has a refractive power and includes a seventh lens, an eighth lens, a ninth lens, and a tenth lens; the seventh lens, the eighth lens, the ninth lens, and the tenth lens are arranged along the optical axis in the order from the object side to the image side; the third lens has a positive refractive power, the third lens is a meniscus lens and has a convex surface facing the object side and a concave surface facing the image side; the fourth lens is a biconvex lens having positive refractive power and having a convex surface facing the object side and another convex surface facing the image side; the combination of the sixth lens and the eleventh lens has a positive refractive power, the sixth lens is a biconcave lens and further has another concave surface facing the image side; the sixth lens and the eleventh lens are fixed with cement; the combination of the seventh lens and the eighth lens has a positive refractive power, the seventh lens is a biconcave lens having a negative refractive power and has a concave surface facing the object side and another concave surface facing the image side, the eighth lens is a biconvex lens having a positive refractive power and has a convex surface facing the object side and another convex surface facing the image side, and the seventh lens and the eighth lens are fixed with cement; the ninth lens is a biconvex lens having a positive refractive power and has a convex surface facing the object side and another convex surface facing the image side; and 5. The optical system of claim 4, wherein the tenth lens is a plano-convex lens having positive refractive power and has a convex surface facing the object side and a planar surface facing the image side.

8. the first lens is a meniscus lens having negative refractive power and having a convex surface facing the object side and a concave surface facing the image side; the second lens is a meniscus lens having a positive refractive power and having a convex surface facing the object side and a concave surface facing the image side; 8. The optical system of claim 7, wherein the first lens and the second lens are secured together by cement.

9. the eyepiece module has a refractive power and includes a seventh lens, an eighth lens, a ninth lens, and a tenth lens; the seventh lens, the eighth lens, the ninth lens, and the tenth lens are arranged along the optical axis in the order from the object side to the image side; the first lens is a biconvex lens having positive refractive power and has a convex surface facing the object side and another convex surface facing the image side, the second lens is a meniscus lens having negative refractive power and has a concave surface facing the object side and a convex surface facing the image side, the first lens and the second lens are fixed together with cement; the third lens is a biconcave lens having another concave surface facing the object side and another concave surface facing the image side; the fourth lens is a biconvex lens having positive refractive power and having a convex surface facing the object side and another convex surface facing the image side; the combination of the sixth lens and the eleventh lens has a positive refractive power, the sixth lens is a meniscus lens, and further has a convex surface facing the image side; the combination of the seventh lens and the eighth lens has a negative refractive power, the seventh lens is a biconcave lens having a negative refractive power and has a concave surface facing the object side and another concave surface facing the image side, the eighth lens is a biconvex lens having a positive refractive power and has a convex surface facing the object side and another convex surface facing the image side, the seventh lens and the eighth lens are fixed with cement, the ninth lens is a biconvex lens having positive refractive power and having a convex surface facing the object side and another convex surface facing the image side; 5. The optical system of claim 4, wherein the tenth lens is a meniscus lens having positive refractive power and has a convex surface facing the object side and a concave surface facing the image side.

10. the eyepiece module has a refractive power and includes a seventh lens, an eighth lens, a ninth lens, and a tenth lens; the seventh lens, the eighth lens, the ninth lens, and the tenth lens are arranged along the optical axis in the order from the object side to the image side; the combination of the third lens and the eleventh lens has a negative refractive power, the third lens is a biconcave lens having negative refractive power and having a concave surface facing the object side and another concave surface facing the image side; the eleventh lens is a biconvex lens having a positive refractive power and having a convex surface facing the object side and another convex surface facing the image side; the third lens and the eleventh lens are fixed with cement; the first lens is a meniscus lens having negative refractive power and has a convex surface facing the object side and a concave surface facing the image side, the second lens is a biconvex lens having positive refractive power and has a convex surface facing the object side and another convex surface facing the image side, the first lens and the second lens are fixed together with cement; the fourth lens is a biconvex lens and has a convex surface facing the object side and another convex surface facing the image side; the sixth lens is a meniscus lens having negative refractive power and having a concave surface facing the object side and a convex surface facing the image side; the combination of the seventh lens and the eighth lens has a negative refractive power, the seventh lens is a biconcave lens having a negative refractive power and has a concave surface facing the object side and another concave surface facing the image side, the eighth lens is a biconvex lens having a positive refractive power and has a convex surface facing the object side and another convex surface facing the image side, the seventh lens and the eighth lens are fixed with cement, the ninth lens is a biconvex lens having positive refractive power and having a convex surface facing the object side and another convex surface facing the image side; 3. The optical system of claim 2, wherein the tenth lens is a meniscus lens having positive refractive power and has a convex surface facing the object side and a concave surface facing the image side.

Images