Liquid light guide system

Abstract

The utility model relates to a liquid light guide system. From an incident light path, the liquid light guide system comprises a coupling lens group with positive focal power; a liquid optical fiber; the convergent lens group has positive focal power; the liquid light guide system meets the following relational expressions: H1 / H2 is more than 7 and less than 9; h2 / H3 is less than 1; 2 < H4 / H3 < 5; wherein H1 represents the height of the edge light of the first lens from the incident light path in the coupling lens group; h2 represents the incident height of the edge light of the liquid optical fiber; h3 represents the emergent height of the marginal light of the liquid optical fiber, and H4 represents the height of the marginal light focused on a primary image plane by the convergent mirror group. The liquid light guide system has high numerical aperture, broadband chromatic aberration correction and excellent transmission performance, the coupling rate between the light box and the liquid optical fiber can reach 100%, the utilization rate of light energy can reach 100%, and loss is reduced. In addition, the number of the lenses of the liquid light guide system does not exceed eight, the lengths of the coupling lens group and the convergent lens group of the liquid light guide system are smaller than 140 mm, and the liquid light guide system is compact in structure and easy to install.

Description

Technical Field

[0001] The utility model relates to the technical field of optical fiber coupling and optical fiber transmission, in particular to a liquid light guide system. Background Art

[0002] With the development of optical technology, fiber optic transmission technology is an important research direction. Fiber optic transmission technology is a technology that transmits signals through optical fibers and can be used to transmit optical signals. Compared with traditional solid-state optical fibers, liquid optical fibers have the characteristics of high numerical aperture, wide-band chromatic aberration correction, and excellent output performance, which can achieve more efficient optical transmission.

[0003] In order to achieve more efficient transmission of optical signals, in addition to high-performance liquid optical fibers, a matching optical system is also required. In the existing optical systems used for liquid optical fibers, the coupling rate between the light box and the liquid optical fiber is low, resulting in low utilization of light energy when transmitted to subsequent illuminators, and large losses in optical signals. Utility Model Content

[0004] Based on this, it is necessary to provide a liquid light guide system to address the problems of low coupling rate between the light box and the liquid optical fiber and low light energy utilization rate in the existing liquid optical fiber optical system.

[0005] A liquid light guide system comprises, starting from the incident light path, the following:

[0006] A coupling lens group with positive optical power;

[0007] Liquid optical fiber; and

[0008] A converging lens group having positive optical power;

[0009] The liquid light guide system satisfies the following relationship:

[0010] 7<|H1 / H2|<9;

[0011] |H2 / H3|<1;

[0012] 2<|H4 / H3|<5;

[0013] Among them, H1 represents the edge light height of the first lens in the coupling lens group starting from the incident light path; H2 represents the edge light incident height of the liquid optical fiber; H3 represents the edge light exit height of the liquid optical fiber, and H4 represents the edge light height of the converging lens group focused on the primary image plane.

[0014] In one embodiment, the liquid light guide system satisfies the following relationship:

[0015] 0.5<D1 / fobj1<1.5;

[0016] fobj1>20;

[0017] 0.3<|D2 / fobj2|<3;

[0018] |fobj2|>30;

[0019] Wherein, D1 represents the distance from the first surface of the coupling lens group starting from the incident light path to the incident end face of the core of the liquid optical fiber; fobj1 represents the focal length of the coupling lens group; D2 represents the distance from the exit end face of the liquid optical fiber to the primary image plane; fobj2 represents the focal length of the converging lens group.

[0020] In one embodiment, the coupling lens group includes a first lens group, the first lens group includes a plurality of single-piece lenses, and the first lens group includes at least one single-piece lens with positive optical power.

[0021] In one embodiment, the numerical aperture of the liquid optical fiber is in the range of 0.4 to 0.6.

[0022] In one embodiment, the transmission band of the liquid optical fiber covers a range of 350 nm to 750 nm.

[0023] In one embodiment, the length of the liquid optical fiber ranges from 0.5 m to 3 m, and the core diameter of the liquid optical fiber ranges from 3 mm to 5 mm.

[0024] In one embodiment, the converging lens group includes a second lens group and a third lens group, the second lens group includes a plurality of single lenses, and the second lens group includes at least two single lenses with positive optical power, and the third lens group includes a plurality of single lenses with positive optical power.

[0025] In one embodiment, the liquid light guide system satisfies the following relationship:

[0026] 0.04<|fG2 / fobj2|<0.5;

[0027] Wherein, fobj2 represents the focal length of the converging lens group; fG2 is the focal length of the second lens group of the converging lens group.

[0028] In one embodiment, the liquid light guide system satisfies the following relationship:

[0029] 0.1<|fG3 / fobj2|<0.8;

[0030] Wherein, fobj2 represents the focal length of the converging lens group; fG3 represents the focal length of the third lens group of the converging lens group.

[0031] In one embodiment, the sum of the number of lenses in the coupling lens group and the number of lenses in the converging lens group is less than or equal to eight.

[0032] In one embodiment, the sum of the length of the coupling lens assembly and the length of the converging lens assembly is less than 140 mm.

[0033] The liquid light guide system has a high numerical aperture, wide-band chromatic aberration correction and excellent transmission performance, and can make the coupling rate between the light box and the liquid optical fiber reach 100%, so that the utilization rate of light energy reaches 100%, and the loss is reduced. In addition, the number of lenses of the liquid light guide system does not exceed eight, and the length of the coupling lens group and the converging lens group of the liquid light guide system is less than 140mm, with a compact structure and easy installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic plan view of a liquid light guide system provided for a first example of the present application;

[0035] Figure 2 A light trace diagram of a coupling lens assembly of a liquid light guide system of the first example of the present application;

[0036] Figure 3 A geometric image analysis diagram of a coupling lens assembly of a liquid light guide system of the first example of the present application;

[0037] Figure 4 A schematic plan view of a liquid light guide system provided for a second example of the present application;

[0038] Figure 5 A light trace diagram of a coupling lens assembly of a liquid light guide system of a second example of the present application;

[0039] Figure 6 A geometric image analysis diagram of a coupling lens assembly of a liquid light guide system of a second example of the present application;

[0040] Figure 7 A schematic plan view of a liquid light guide system provided for a third example of the present application;

[0041] Figure 8 A light trace diagram of a coupling lens assembly of a liquid light guide system of a third example of the present application;

[0042] Fig. 9 A geometric image analysis diagram of a coupling lens assembly of a liquid light guide system of a third example of the present application;

[0043] Fig.10 A schematic plan view of a liquid light guide system provided for a fourth example of the present application;

[0044] Fig.11A light trace diagram of a coupling lens assembly of a liquid light guide system of a fourth example of the present application;

[0045] Fig.12 This is a geometric image analysis diagram of the coupling mirror assembly of the liquid light guide system of the fourth example of the present application.

[0046] Figure numerals: T1, coupling lens group; T2, converging lens group; G1, first lens group; G2, second lens group; G3, third lens group; 1, first lens; 2, second lens; 3, third lens; 4, fourth lens; 5, fifth lens; 6, sixth lens; 7, seventh lens; 8, eighth lens; 9, liquid optical fiber. DETAILED DESCRIPTION

[0047] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0048] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0049] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0050] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0052] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0053] Specifically, Figure 1 , Figure 4 , Figure 7 and Fig.10 As shown, the present application provides a liquid light guide system for light transmission, and the liquid light guide system includes, from the incident light path, a coupling lens group T1 with positive optical power, a liquid optical fiber 9, and a converging lens group T2 with positive optical power. The coupling lens group T1 is used to couple the light emitted by the LED light box into the liquid optical fiber 9, the liquid optical fiber 9 is used to transmit light, and the converging lens group T2 is used to converge the light transmitted by the liquid optical fiber 9 to a primary image plane and output it to the illuminator.

[0054] The liquid optical waveguide system satisfies the following relationship: 7<|H1 / H2|<9; |H2 / H3|<1; 2<|H4 / H3|<5; wherein H1 represents the edge light height of the first lens in the coupling lens group starting from the incident light path; H2 represents the edge light incident height of the liquid optical fiber; H3 represents the edge light exit height of the liquid optical fiber, and H4 represents the edge light height of the converging lens group focused on the primary image plane.

[0055] It can be understood that when H1, H2, H3 and H4 satisfy the above relationship, the coupling rate between the light box and the liquid optical fiber can reach 100%, and the utilization rate of light energy by the liquid optical waveguide system can reach 100%, thereby reducing losses.

[0056] More specifically, in one embodiment, the liquid light guide system satisfies the following relationship: 0.5<D1 / fobj1<1.5; fobj1>20; 0.3<|D2 / fobj2|<3; |fobj2|>30; wherein D1 represents the distance from the first surface of the coupling lens group starting from the incident light path to the incident end face of the core of the liquid optical fiber; fobj1 represents the focal length of the coupling lens group; D2 represents the distance from the exit end face of the liquid optical fiber to the primary image plane; fobj2 represents the focal length of the converging lens group.

[0057] Optionally, in one embodiment, the coupling lens group T1 includes a first lens group G1, the first lens group G1 includes a plurality of monolithic lenses, and the first lens group G1 includes at least one monolithic lens with positive optical power. The first lens group G1 is used to couple the light emitted by the light box into the liquid grating.

[0058] Optionally, in one of the embodiments, the numerical aperture of the liquid optical fiber is in the range of 0.4 to 0.6.

[0059] Optionally, in one of the embodiments, the transmission band of the liquid optical fiber covers a range of 350 nm to 750 nm.

[0060] Optionally, in one embodiment, the length of the liquid optical fiber ranges from 0.5 m to 3 m, and the core diameter of the liquid optical fiber 9 ranges from 3 mm to 5 mm.

[0061] With such a configuration, the liquid optical fiber can collect and transmit light more effectively, so that the liquid optical fiber system can adapt to the requirements of more application scenarios.

[0062] In one embodiment, the converging lens group T2 includes a second lens group G2 and a third lens group G3, the second lens group G2 includes a plurality of single lenses, and the second lens group G2 includes at least two single lenses with positive optical power, and the third lens group G3 includes a plurality of single lenses with positive optical power. The second lens group G2 and the third lens group G3 cooperate to converge the light output by the liquid optical fiber 9 onto a primary image plane to output to the illuminator.

[0063] Preferably, in one of the embodiments, the liquid light guide system satisfies the following relationship:

[0064] 0.04<|fG2 / fobj2|<0.5; wherein fobj2 represents the focal length of the converging lens group; and fG2 is the focal length of the second lens group of the converging lens group.

[0065] Preferably, in one of the embodiments, the liquid light guide system satisfies the following relationship: 0.1<|fG3 / fobj2|<0.8; wherein fobj2 represents the focal length of the converging lens group; and fG3 represents the focal length of the third lens group of the converging lens group.

[0066] In particular, in one embodiment, the sum of the number of lenses of the coupling lens group and the number of lenses of the converging lens group is less than or equal to eight.

[0067] Preferably, in one embodiment, the sum of the length of the coupling lens group and the length of the converging lens group is less than 140 mm. This arrangement makes the structure of the liquid light guide system more compact and easier to install.

[0068] For example, Figure 1 As shown, in the first example of the present application, the liquid light guide system includes a coupling lens group T1, a liquid optical fiber 9 and a converging lens group T2. The coupling lens group T1 includes a first lens group G1, and the first lens group G1 includes a first lens 1, a second lens 2 and a third lens 3 arranged in sequence. The first lens 1 is a biconvex lens, the second lens 2 is a meniscus lens, and the third lens 3 is a biconcave lens. The converging lens group T2 includes a second lens group G2 and a third lens group G3 arranged in sequence. The second lens group G2 includes a fourth lens 4 and a fifth lens 5. The fourth lens 4 is a concave-convex lens with positive focal length, and the fifth lens 5 is a plano-convex lens; the third lens group G3 includes a sixth lens 6 and a seventh lens 7. The sixth lens 6 is a biconvex lens with positive focal length, and the seventh lens 7 is a concave-convex lens. The spectral range of the liquid light guide system is 350nm to 750nm. The vertical aperture of the liquid optical fiber 9 is 0.53 and the core diameter is 3mm.

[0069] The liquid light guide system includes 7 lenses. From the incident direction, the side of the first lens 1 close to the incident direction is S1, and the side of the seventh lens 7 away from the incident direction is S14.

[0070] The liquid light guide system includes the following characteristics: D1 / fobj1=1.18; fobj1=21.9; |D2 / fobj2|=0.42; fobj2=-285.6; NA=0.53; wherein D1 represents the distance from the first surface of the coupling mirror group starting from the incident light path to the incident end face of the core of the liquid optical fiber; fobj1 represents the focal length of the coupling mirror group; D2 represents the distance from the exit end face of the liquid optical fiber to the primary image plane; fobj2 represents the focal length of the converging mirror group; NA represents the vertical aperture of the liquid optical fiber.

[0071] |H1 / H2|=8.6; |H2 / H3|=0.97; |H4 / H3|=3; wherein, H1 represents the edge ray height of the first lens in the coupling lens group starting from the incident light path; H2 represents the edge ray incident height of the liquid optical fiber; H3 represents the edge ray exit height of the liquid optical fiber, and H4 represents the edge ray height of the converging lens group focused on the primary image plane.

[0072] L1=1.85; L1 represents the optical interval between the first lens and the second lens.

[0073] L2=3; L2 represents the optical interval between the second lens and the third lens.

[0074] L3=4; L3 represents the optical distance between the third lens and the incident end face of the liquid optical fiber core.

[0075] L4=3; L4 represents the optical distance between the light outlet of the liquid optical fiber and the fourth lens.

[0076] L5=1.5; L5 represents an optical interval between the fourth lens and the fifth lens.

[0077] L6=47; L6 represents the optical interval between the fifth lens and the sixth lens.

[0078] L7=1; L7 represents an optical interval between the sixth lens and the seventh lens.

[0079] L8=45.5; L8 represents the optical distance between the seventh lens and the focal plane of the converging lens group.

[0080] |fT1 / fobj 1|=1.75; wherein fT1 is the focal length of the first lens;

[0081] |fT2 / fobj1|=1.1; wherein fT2 is the focal length of the second lens;

[0082] |fT3 / fobj 1|=0.73; wherein fT3 is the focal length of the third lens;

[0083] |fG2 / fobj2|=0.05; wherein fG2 is the focal length of the second lens group of the converging lens group;

[0084] |fG2 / fobj2|=0.125; wherein fG3 is the focal length of the third lens group of the converging lens group.

[0085] The lens thickness and radius of the liquid light guide system of the first example meet the conditions of Table 1:

[0086] Table 1: Lens parameters of the liquid light guide system of the first example

[0087] surface Radius(mm) Thickness(mm) Refractive index Nd Abbe number Vd S1 36.1 7.4 1.49 70.4 S2 -36.1 1.85 S3 10.745 6 1.62 58.2 S4 28.8647 3 S5 -48.8345 3.5 1.57 56 S6 11.325 4 S7 -12.385 7 1.59 61.2 S8 -9.53 1.5 S9 endless 5.3 1.62 58.2 S10 -17.7364 47 S11 152.583 5 1.49 70.4 S12 -45.687 1 S13 34.5865 4.3 1.57 56 S14 834.7223 45.5

[0088] Among them, the radius refers to the radius of curvature of the lens surface, and the thickness refers to the axial distance from the current surface to the next surface. For example, the thickness of surface S1 is the distance from S1 to S2, which may be the axial thickness of the medium or lens, or the axial air gap between them.

[0089] Figure 2 This is the light trace diagram of the coupling mirror group of the liquid light guide system of the first example. From the diagram, it can be seen that the edge light height is 1.4606 mm, which is smaller than the radius of the optical fiber core of 1.5 mm, and all the light can be injected into the optical fiber.

[0090] Figure 3 This is a geometric image analysis diagram of the coupling mirror group of the liquid light guide system of the first example. The numerical aperture of the receiving optical fiber is set to 0.53 and the receiving range is 3 mm. It can be concluded that the optical fiber coupling rate is 100% and the coupling efficiency is high.

[0091] For example, Figure 4As shown, in the second example of the present application, the liquid light guide system includes a coupling lens group T1, a liquid optical fiber 9 and a converging lens group T2, the coupling lens group T1 includes a first lens group G1, the first lens group G1 includes a first lens 1, a second lens 2 and a third lens 3 arranged in sequence, the first lens 1 is a biconvex lens, the second lens 2 is a meniscus lens, and the third lens 3 is a plano-concave lens. The converging lens group T2 includes a second lens group G2 and a third lens group G3 arranged in sequence, the second lens group G2 includes a fourth lens 4 and a fifth lens 5, the fourth lens 4 is a concave-convex lens with positive focal length, and the fifth lens 5 is a plano-convex lens; the third lens group G3 includes a sixth lens 6, a seventh lens 7 and an eighth lens 8, the sixth lens 6 is a convex-concave lens with negative focal length, the seventh lens 7 is a biconvex lens, and the eighth lens 8 is a convex-concave lens. The spectral range of the liquid light guide system is 350nm to 750nm, the vertical aperture of the liquid optical fiber 9 is 0.55, and the core diameter is 4mm.

[0092] The liquid light guide system includes 8 lenses. From the incident direction, the side of the first lens close to the incident direction is S1, and the side of the eighth lens away from the incident direction is S16.

[0093] The liquid light guide system includes the following characteristics: D1 / fobj1=0.9; fobj1=21.6; |D2 / fobj2|=1.34; fobj2=81.6; NA=0.55; wherein D1 represents the distance from the first surface of the coupling mirror group starting from the incident light path to the incident end face of the core of the liquid optical fiber; fobj1 represents the focal length of the coupling mirror group; D2 represents the distance from the exit end face of the liquid optical fiber to the primary image plane; fobj2 represents the focal length of the converging mirror group; NA represents the vertical aperture of the liquid optical fiber.

[0094] |H1 / H2|=8.3; |H2 / H3|=0.785; |H4 / H3|=3; wherein, H1 represents the edge ray height of the first lens in the coupling lens group starting from the incident light path; H2 represents the edge ray incident height of the liquid optical fiber; H3 represents the edge ray exit height of the liquid optical fiber, and H4 represents the edge ray height of the converging lens group focused on the primary image plane.

[0095] L1=5.4; L1 represents the optical interval between the first lens and the second lens.

[0096] L2=2.87; L2 represents the optical interval between the second lens and the third lens.

[0097] L3=3; L3 represents the optical distance between the third lens and the incident end face of the liquid optical fiber core.

[0098] L4=3; L4 represents the optical distance between the light outlet of the liquid optical fiber and the fourth lens.

[0099] L5=10.34; L5 represents an optical interval between the fourth lens and the fifth lens.

[0100] L6=23.5; L6 represents the optical interval between the fifth lens and the sixth lens.

[0101] L7=3; L7 represents an optical interval between the sixth lens and the seventh lens.

[0102] L8 = 1.8; L8 represents the optical distance between the seventh lens and the eighth lens

[0103] L9=47; L9 represents the optical distance between the eighth lens and the focal plane of the converging lens group.

[0104] |fT1 / fobj 1|=1.27; wherein fT1 is the focal length of the first lens;

[0105] |fT2 / fobj1|=0.9; wherein fT2 is the focal length of the second lens;

[0106] |fT3 / fobj1|=0.2; wherein fT3 is the focal length of the third lens;

[0107] |fG2 / fobj2|=0.19; wherein fG2 is the focal length of the second lens group of the converging lens group;

[0108] |fG3 / fobj2|=0.41; wherein fG3 is the focal length of the third lens group of the converging lens group.

[0109] The lens thickness and radius of the liquid light guide system of the second example meet the conditions of Table 2:

[0110] Table 2: Lens parameters of the liquid light guide system of the second example

[0111]

[0112]

[0113] Among them, the radius refers to the radius of curvature of the lens surface, and the thickness refers to the axial distance from the current surface to the next surface. For example, the thickness of surface S1 is the distance from S1 to S2, which may be the axial thickness of the medium or lens, or the axial air gap between them.

[0114] Figure 5This is the light trace diagram of the coupling mirror group of the liquid light guide system of the second example. From the figure, it can be seen that the edge light height is 1.57 mm, which is smaller than the radius of the optical fiber core of 2 mm, and all the light can enter the optical fiber.

[0115] Figure 6 This is a geometric image analysis diagram of the coupling mirror group of the liquid light guide system of the second example. The numerical aperture of the receiving optical fiber is set to 0.55 and the receiving range is 4 mm. It can be concluded that the optical fiber coupling rate is 100% and the coupling efficiency is high.

[0116] For example, Figure 7 As shown, in the third example of the present application, the liquid light guide system includes a coupling lens group T1, a liquid optical fiber 9 and a converging lens group T2. The coupling lens group T1 includes a first lens group G1, and the first lens group G1 includes a first lens 1 and a second lens 2 arranged in sequence. The first lens 1 is a biconvex lens, and the second lens 2 is a convex-concave lens. The converging lens group T2 includes a second lens group G2 and a third lens group G3 arranged in sequence. The second lens group G2 includes a third lens 3 and a fourth lens 4. The third lens 3 is a concave-convex lens with positive focal length, and the fourth lens 4 is a concave-convex lens; the third lens group G3 includes a fifth lens 5 and a sixth lens 6. The fifth lens 5 is a convex-concave lens with positive focal length, and the sixth lens 6 is a convex-concave lens. The spectral range of the liquid light guide system is 350nm to 750nm. The vertical aperture of the liquid optical fiber 9 is 0.43, and the core diameter is 4mm.

[0117] The liquid light guide system includes 6 lenses. From the incident direction, the side of the first lens close to the incident direction is S1, and the side of the sixth lens away from the incident direction is S12.

[0118] The liquid light guide system includes the following features:

[0119] D1 / fobj1=0.85; fobj1=34.34; |D2 / fobj2|=0.36; fobj2=-350; NA=0.43;

[0120] Wherein, D1 represents the distance from the first surface of the coupling lens group from the incident light path to the incident end face of the core of the liquid optical fiber; fobj1 represents the focal length of the coupling lens group; D2 represents the distance from the exit end face of the liquid optical fiber to the primary image plane; fobj2 represents the focal length of the converging lens group; NA represents the vertical aperture of the liquid optical fiber.

[0121] |H1 / H2|=7.8; |H2 / H3|=0.83; |H4 / H3|=2.37; wherein, H1 represents the edge ray height of the first lens in the coupling lens group starting from the incident light path; H2 represents the edge ray incident height of the liquid optical fiber; H3 represents the edge ray exit height of the liquid optical fiber, and H4 represents the edge ray height of the converging lens group focused on the primary image plane.

[0122] L1=11.5; L1 represents the optical interval between the first lens and the second lens.

[0123] L2=3; L2 represents the optical distance between the second lens and the incident end face of the liquid optical fiber core.

[0124] L3=3; L3 represents the optical distance between the light outlet of the liquid optical fiber and the third lens.

[0125] L4=1; L4 represents the optical interval between the third lens and the fourth lens.

[0126] L5=52.5; L5 represents an optical interval between the fourth lens and the fifth lens.

[0127] L6=1.5; L6 represents an optical interval between the fifth lens and the sixth lens.

[0128] L7=46.7; L7 represents the optical distance between the sixth lens and the focal plane of the converging lens group.

[0129] |fT1 / fobj 1|=1.21; wherein fT1 is the focal length of the first lens;

[0130] |fT2 / fobj 1|=0.74; wherein fT2 is the focal length of the second lens;

[0131] |fG2 / fobj2|=0.044; wherein fG2 is the focal length of the second lens group of the converging lens group;

[0132] |fG3 / fobj2|=0.73; wherein fG3 is the focal length of the third lens group of the converging lens group.

[0133] The lens thickness and radius of the liquid light guide system of the third example meet the conditions of Table 3:

[0134] Table 3: Lens parameters of the liquid light guide system of the third example

[0135] surface Radius(mm) Thickness(mm) Refractive index Nd Abbe number Vd S1 33.634 5 1.59 67.3 S2 -87.254 11.5 S3 9.785 10 1.88 40.8 S4 3.6 3 S5 -14.98 10 1.62 63.4 S6 -10 1 S7 -247.65 5 1.6 65.5 S8 -22.056 52.5 S9 91.45 4 1.62 63.4 S10 -91.45 1.5 S11 34.257 3 1.62 63.8 S12 157.88 46.7

[0136] Among them, the radius refers to the radius of curvature of the lens surface, and the thickness refers to the axial distance from the current surface to the next surface. For example, the thickness of surface S1 is the distance from S1 to S2, which may be the axial thickness of the medium or lens, or the axial air gap between them.

[0137] Figure 8 This is the light trace diagram of the coupling mirror group of the liquid light guide system of the third example. From the figure, it can be seen that the edge light height is 1.633mm, which is smaller than the radius of the optical fiber core of 2mm, and all the light can enter the optical fiber.

[0138] Fig. 9 This is a geometric image analysis diagram of the coupling mirror group of the liquid light guide system of the third example. The numerical aperture of the receiving optical fiber is set to 0.43 and the receiving range is 4 mm. It can be concluded that the optical fiber coupling rate is 100% and the coupling efficiency is high.

[0139] For example, Fig.10 As shown, in the fourth example of the present application, the liquid light guide system includes a coupling lens group T1, a liquid optical fiber 9 and a converging lens group T2. The coupling lens group T1 includes a first lens group G1, and the first lens group G1 includes a first lens 1, a second lens 2 and a third lens 3 arranged in sequence. The first lens 1 is a biconvex lens, the second lens 2 is a meniscus lens, and the third lens 3 is a biconcave lens. The converging lens group T2 includes a second lens group G2 and a third lens group G3 arranged in sequence. The second lens group G2 includes a fourth lens 4 and a fifth lens 5. The fourth lens 4 is a plano-convex lens with positive optical power, and the fifth lens 5 is a plano-concave lens; the third lens group G3 includes a sixth lens 6 and a seventh lens 7. The sixth lens 6 is a biconvex lens with positive optical power, and the seventh lens 7 is a biconvex lens. The spectral range of the liquid light guide system is 350nm to 750nm. The vertical aperture of the liquid optical fiber 9 is 0.43, and the core diameter is 3mm.

[0140] The liquid light guide system includes 7 lenses. From the incident direction, the side of the first lens close to the incident direction is S1, and the side of the seventh lens away from the incident direction is S14.

[0141] The liquid light guide system includes the following features:

[0142] D1 / fobj1=0.95; fobj1=25.38; |D2 / fobj2|=2.62; fobj2=34.7; NA=0.43;

[0143] Wherein, D1 represents the distance from the first surface of the coupling lens group from the incident light path to the incident end face of the core of the liquid optical fiber; fobj1 represents the focal length of the coupling lens group; D2 represents the distance from the exit end face of the liquid optical fiber to the primary image plane; fobj2 represents the focal length of the converging lens group; NA represents the vertical aperture of the liquid optical fiber.

[0144] |H1 / H2|=8.3; |H2 / H3|=0.98; |H4 / H3|=2.73; wherein H1 represents the edge ray height of the first lens in the coupling lens group T1 starting from the incident light path; H2 represents the edge ray incident height of the liquid optical fiber; H3 represents the edge ray exit height of the liquid optical fiber, and H4 represents the edge ray height of the converging lens group focused on the primary image plane.

[0145] L1=2; L1 represents the optical interval between the first lens and the second lens.

[0146] L2=3; L2 represents the optical interval between the second lens and the third lens.

[0147] L3=3; L3 represents the optical distance between the third lens and the incident end face of the liquid optical fiber core.

[0148] L4=3; L4 represents the optical distance between the light outlet of the liquid optical fiber and the fourth lens.

[0149] L5=10.5; L5 represents an optical interval between the fourth lens and the fifth lens.

[0150] L6=2.8; L6 represents the optical interval between the fifth lens and the sixth lens.

[0151] L7=6; L7 represents an optical interval between the sixth lens and the seventh lens.

[0152] L8=47.5; L8 represents the optical distance between the seventh lens and the focal plane of the converging lens group.

[0153] |fT1 / fobj 1|=1.46; wherein fT1 is the focal length of the first lens;

[0154] |fT2 / fobj 1|=0.82; wherein fT2 is the focal length of the second lens;

[0155] |fT3 / fobj 1|=0.25; wherein fT3 is the focal length of the third lens;

[0156] |fG2 / fobj2|=0.41; wherein fG2 is the focal length of the second lens group of the converging lens group;

[0157] |fG3 / fobj2|=0.265; wherein fG3 is the focal length of the third lens group of the converging lens group.

[0158] The lens thickness and radius of the liquid light guide system of the fourth example meet the conditions of Table 1:

[0159] Table 4: Lens parameter table of the liquid light guide system of the fourth example

[0160] surface Radius(mm) Thickness(mm) Refractive index Nd Abbe number Vd S1 34.03 6.5 1.46 90.5 S2 -31.6 2 S3 9.96 5 1.82 46.5 S4 18.657 3 S5 -150 4.5 1.85 23.8 S6 5.73 3 S7 endless 6.1 1.57 71.3 S8 -7.76 10.5 S9 endless 4 1.73 54.5 S10 23.17 2.8 S11 198.73 6 1.44 94.5 S12 -13.4 6 S13 35.8 7 1.57 71.3 S14 -35.8 47.5

[0161] Among them, the radius refers to the radius of curvature of the lens surface, and the thickness refers to the axial distance from the current surface to the next surface. For example, the thickness of surface S1 is the distance from S1 to S2, which may be the axial thickness of the medium or lens, or the axial air gap between them.

[0162] Fig.11 This is the light trace diagram of the coupling mirror group of the liquid light guide system of the fourth example. From the diagram, it can be seen that the edge light height is 1.4692 mm, which is smaller than the radius of the optical fiber core of 1.5 mm, and all the light can be injected into the optical fiber.

[0163] Fig.12 This is a geometric image analysis diagram of the coupling mirror group of the liquid light guide system of the fourth example. The numerical aperture of the receiving optical fiber is set to 0.43, and the receiving range is 3 mm. It can be concluded that the optical fiber coupling rate is 100%, and the coupling efficiency is high.

[0164] In summary, the present application provides a liquid light guide system, which has a high numerical aperture, wide-band chromatic aberration correction, and excellent transmission performance, and can make the coupling rate between the light box and the liquid optical fiber reach 100%, so that the utilization rate of light energy reaches 100%, and the loss is reduced. In addition, the number of lenses of the liquid light guide system does not exceed eight, and the length of the coupling lens group and the converging lens group of the liquid light guide system is less than 140 mm, with a compact structure and easy installation.

[0165] The technical features of the above embodiment can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above embodiment are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0166] The above embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A liquid light guide system, characterized in that: From the incident light path, it includes: A coupling lens group having positive optical power; Liquid optical fiber; and A converging lens group having positive optical power; The liquid light guide system satisfies the following relationship: 7<|H1 / H2|<9; |H2 / H3|<1; 2<|H4 / H3|<5; Among them, H1 represents the edge light height of the first lens in the coupling lens group starting from the incident light path; H2 represents the edge light incident height of the liquid optical fiber; H3 represents the edge light exit height of the liquid optical fiber, and H4 represents the edge light height of the converging lens group focused on the primary image plane.

2. The liquid light guide system according to claim 1, characterized in that The liquid light guide system satisfies the following relationship: 0.5<D1 / fobj1<1.5; fobj1>20; 0.3<|D2 / fobj2|<3; |fobj2|>30; Wherein, D1 represents the distance from the first surface of the coupling lens group starting from the incident light path to the incident end face of the core of the liquid optical fiber; fobj1 represents the focal length of the coupling lens group; D2 represents the distance from the exit end face of the liquid optical fiber to the primary image plane; fobj2 represents the focal length of the converging lens group.

3. The liquid light guide system according to claim 2, characterized in that The coupling lens group includes a first lens group, the first lens group includes a plurality of single-piece lenses, and the first lens group includes at least one single-piece lens with positive optical power.

4. The liquid light guide system according to claim 2, characterized in that The numerical aperture of the liquid optical fiber is in the range of 0.4 to 0.

6.

5. The liquid light guide system according to claim 2, characterized in that The transmission wavelength band of the liquid optical fiber covers a range of 350nm to 750nm.

6. The liquid light guide system according to claim 2, characterized in that The length of the liquid optical fiber ranges from 0.5m to 3m, and the core diameter of the liquid optical fiber ranges from 3mm to 5mm.

7. The liquid light guide system according to claim 2, characterized in that: The converging lens group includes a second lens group and a third lens group, the second lens group includes a plurality of single lenses, and the second lens group includes at least two single lenses with positive optical power, and the third lens group includes a plurality of single lenses with positive optical power.

8. The liquid light guide system according to claim 7, characterized in that The liquid light guide system satisfies the following relationship: 0.04<|fG2 / fobj2|<0.5; Wherein, fobj2 represents the focal length of the converging lens group; fG2 is the focal length of the second lens group of the converging lens group.

9. The liquid light guide system according to claim 7, characterized in that: The liquid light guide system satisfies the following relationship: 0.1<|fG3 / fobj2|<0.8; Wherein, fobj2 represents the focal length of the converging lens group; fG3 represents the focal length of the third lens group of the converging lens group.

10. The liquid light guide system according to any one of claims 1 to 9, characterized in that The sum of the number of lenses of the coupling lens group and the number of lenses of the converging lens group is less than or equal to eight.

11. The liquid light guide system according to any one of claims 1 to 9, characterized in that The sum of the length of the coupling lens assembly and the length of the converging lens assembly is less than 140 mm.

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