Athermalized human eye-like conic lens

Abstract

The application discloses a kind of heat-difference elimination human eye cone light lens, including the light path direction of being arranged in order from object side to image side diaphragm, front lens group, middle lens group, rear lens group, filter lens group and image surface;The front lens group includes the first lens with positive focal power, second lens and the third lens and fourth lens that mutually glue and constitute cemented lens, the third lens is negative focal power, fourth lens is positive focal power;The configuration of the present application to each lens group of cone light lens, optical performance is basically unchanged in +10 ℃~+40 ℃ range, can eliminate working environment temperature fluctuation and the chroma performance decline caused by heat transfer to lens temperature rise after heat generation due to camera long time work, improve the accuracy of test.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of conic lens, in particular to a conic lens with thermal aberration correction and human eye simulation. BACKGROUND

[0002] Virtual reality devices such as VR / AR require a conic lens with human eye simulation to simulate the size, position and field of view of human eyes. Unlike traditional lenses with apertures inside the lens, the aperture of the VR / AR lens is in front of the lens, and the complete field of view of the NED can be captured without obstruction. The colorimeter device used for virtual reality detection is generally composed of a conic lens with human eye simulation, an XYZ filter, a medium energy attenuation sheet and a large-format black-and-white industrial camera. Although the working environment temperature is controlled during use, the optical performance of the conic lens will deteriorate with temperature due to the heat generated by the camera during long-term operation and the fluctuation of the surrounding environment temperature, which will cause the colorimeter test accuracy to deteriorate, thereby failing to ensure the optical performance of the conic lens. SUMMARY

[0003] Technical purpose: In view of the problem that the existing conic lens for virtual reality devices is affected by temperature changes and the optical performance of the conic lens is affected, the present application discloses a conic lens with thermal aberration correction and human eye simulation.

[0004] Technical scheme: In order to achieve the above technical purpose, the present application adopts the following technical scheme:

[0005] A conic lens with thermal aberration correction and human eye simulation, comprising a light barrier, a front lens group, a middle lens group, a rear lens group, a filter lens group and an image plane arranged in the order of the optical path direction from the object side to the image side; the front lens group comprises a first lens with positive focal power, a second lens and a third lens and a fourth lens which are mutually cemented to form a cemented lens arranged in the order of the optical path direction, the third lens is negative focal power, and the fourth lens is positive focal power; the focal power of the front lens group satisfies -0.8 <-0.4, is the focal length of the front lens group, is the focal length of the conic lens, and the front lens group eliminates part of the chromatic aberration and thermal aberration effect on the imaging of the conic lens; the middle lens group and the rear lens group are used for relay imaging between the front lens group and the image plane, the focal power of the middle lens group satisfies 1.0 <2.0, is the focal length of the middle lens group, and the focal power of the rear lens group satisfies -3000 <-2000, is the focal length of the rear lens group.

[0006] Preferably, the object side of the first lens of the present application is concave, the image side is convex, and the power is 0.01≤power≤0.015; the object side of the second lens is convex, the image side is convex, and the power is 0.02≤power≤0.03; the object side of the third lens is convex, the image side is concave, and the power is -0.005≤power≤-0.001; the object side of the fourth lens is convex, the image side is convex, and the power is 0.01≤power≤0.02.

[0007] Preferably, the intermediate lens group of the present application comprises a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens, an eleventh lens and a twelfth lens arranged in sequence along the optical path;

[0008] The fifth lens has positive power, the object side is convex, the image side is convex, and the power is 0.01≤power≤0.02;

[0009] The sixth lens has positive power, the object side is convex, the image side is concave or flat, and the power is 0.015≤power≤0.025;

[0010] The seventh lens has negative power, the object side is convex, the image side is concave, and the power is -0.005≤power≤-0.001;

[0011] The eighth lens has negative power, the object side is concave, the image side is concave, and the power is -0.05≤power≤-0.03;

[0012] The ninth lens has positive power, the object side is convex, the image side is concave, and the power is 0.01≤power≤0.02;

[0013] The tenth lens has negative power, the object side is concave, the image side is convex, and the power is -0.1≤power≤-0.05;

[0014] The eleventh lens has positive power, the object side is convex, the image side is convex, and the power is 0.03≤power≤0.05;

[0015] The twelfth lens has positive power, the object side is convex, the image side is convex, and the power is 0.01≤power≤0.03.

[0016] Preferably, the rear lens group of the present application comprises a thirteenth lens, a fourteenth lens, a fifteenth lens, a sixteenth lens and a seventeenth lens arranged in sequence along the optical path;

[0017] The thirteenth lens has positive power, the object side is convex, the image side is convex, and the power is 0.02≤power≤0.03;

[0018] The fourteenth lens has negative power, the object side is concave, the image side is concave, and the power is -0.1≤power≤-0.03;

[0019] The fifteenth lens has negative refractive power, the object side is concave, the image side is concave, -0.05≤refractive power≤-0.04;

[0020] The sixteenth lens has negative refractive power, the object side is convex, the image side is convex, 0.01≤refractive power≤0.03;

[0021] The seventeenth lens has negative refractive power, the object side is convex, the image side is convex, 0.015≤refractive power≤0.035.

[0022] Preferably, each lens of the inventive conic lens satisfies the athermalization condition , is the refractive power of each lens; is the total refractive power of the conic lens; m represents the number of lenses, is the projection height of the first paraxial ray on the surface of each lens; is the athermalization coefficient of the lens; is the thermal expansion coefficient of the mechanical barrel of the conic lens; L is the initial length of the structural member of the mechanical barrel of the conic lens.

[0023] Preferably, the refractive index of the first lens of the present application is in the range of 1.55≤n≤1.65, the dispersion is in the range of 57≤D≤65, and the athermalization coefficient is in the range of -17E-06≤ ≤-13E-06;

[0024] The refractive index of the second lens is in the range of 1.55≤n≤1.65, the dispersion is in the range of 52≤D≤55, and the athermalization coefficient is in the range of -3E-06≤ ≤-1.5E-06;

[0025] The refractive index of the third lens is in the range of 1.78≤n≤1.85, the dispersion is in the range of 33≤D≤38, and the athermalization coefficient is in the range of 5.5E-06≤ ≤6.5E-06;

[0026] The refractive index of the fourth lens is in the range of 1.68≤n≤1.75, the dispersion is in the range of 45≤D≤55, and the athermalization coefficient is in the range of -1.5E-06≤ ≤-0.5E-06;

[0027] The refractive index of the fifth lens is in the range of 1.68≤n≤1.77, the dispersion is in the range of 45≤D≤55, and the athermalization coefficient is in the range of -35E-06≤ ≤-25E-06;

[0028] The refractive index range of the sixth lens is 1.58≤n≤1.65, the dispersion range is 59≤D≤65, and the athermal coefficient range is -5.0E-06≤ ≤-3.0E-06;

[0029] The refractive index range of the seventh lens is 1.61≤n≤1.68, the dispersion range is 30≤D≤35, and the athermal coefficient range is 3.0E-06≤ ≤5.0E-06;

[0030] The refractive index range of the eighth lens is 1.68≤n≤1.75, the dispersion range is 25≤D≤31, and the athermal coefficient range is -10.0E-06≤ ≤-7.0E-06;

[0031] The refractive index range of the ninth lens is 1.55≤n≤1.65, the dispersion range is 45≤D≤55, and the athermal coefficient range is -3.5E-06≤ ≤-5.0E-06;

[0032] The refractive index range of the tenth lens is 1.78≤n≤1.87, the dispersion range is 21≤D≤25, and the athermal coefficient range is -10.0E-06≤ ≤-8.5E-06;

[0033] The refractive index range of the eleventh lens is 1.60≤n≤1.69, the dispersion range is 55≤D≤65, and the athermal coefficient range is -2.0E-06≤ ≤-1.0E-06;

[0034] The refractive index range of the twelfth lens is 1.81≤n≤1.87, the dispersion range is 20≤D≤25, and the athermal coefficient range is -3.5E-06≤ ≤-2.4E-06;

[0035] The refractive index range of the thirteenth lens is 1.55≤n≤1.65, the dispersion range is 62≤D≤70, and the athermal coefficient range is -30E-06≤ ≤-24E-06;

[0036] The refractive index range of the fourteenth lens is 1.70≤n≤1.75, the dispersion range is 25≤D≤30, and the athermal coefficient range is -10E-06≤ ≤-6E-06;

[0037] The refractive index range of the fifteenth lens is 1.70≤n≤1.75, the dispersion range is 25≤D≤30, and the athermal coefficient range is -10E-06≤ ≤-6E-06;

[0038] The refractive index of the sixteenth lens ranges from 1.61 to 1.68, the dispersion ranges from 45 to 55, the athermalization coefficient ranges from -3.0E-06 to -2.0E-06.

[0039] The refractive index of the seventeenth lens ranges from 1.68 to 1.78, the dispersion ranges from 60 to 70, the athermalization coefficient ranges from -35E-06 to -25E-06.

[0040] Preferably, the eighth lens and the ninth lens, the tenth lens and the eleventh lens, the thirteenth lens and the fourteenth lens, and the fifteenth lens and the sixteenth lens of the present application are glued to form a glued lens group respectively, which corrects the imaging chromatic aberration.

[0041] Preferably, the magnification of the middle lens group and the rear lens group of the present application satisfies 0.8 <1.5.

[0042] Preferably, the exit pupil distance of the present application satisfies 0.70 <1.0, is the focal length of the conic lens, is the distance from the stop to the front surface of the first lens.

[0043] Beneficial effects: the conic lens disclosed in the present application has the following beneficial effects:

[0044] 1. The present application utilizes the optical passive athermalization principle to realize that the optical performance remains basically unchanged in the range of +10℃ to +40℃, eliminates the performance decline of the colorimeter caused by the temperature rise of the lens due to the heat transfer after the camera works for a long time, and improves the accuracy of the test.

[0045] 2. The first lens to the fourth lens of the front lens group compresses the outer diameter size of the entire conic lens imaging system and eliminates part of the chromatic aberration and thermal difference in the conic lens imaging process.

[0046] 3. The middle lens group and the rear lens group of the present application jointly undertake the relay imaging function, the middle lens group is a complex of the Gauss lens, undertakes the functions of relay and chromatic aberration and thermal difference correction, and the rear lens group undertakes the functions of chromatic aberration, thermal difference and compression of the chief ray angle on the image side.

[0047] 4. The present application designs the athermalization coefficient range of the lens of the conic lens, so that the entire conic lens meets the athermalization condition, passively compensates in the use process of the conic lens, makes the optical system image surface of the conic lens move with the movement of the photosensitive surface of the detector, and the entire system does not produce defocus.​​ BRIEF DESCRIPTION OF DRAWINGS

[0048] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows.

[0049] Figure 1 Structure diagram of the present application's aneroid human eye cone mirror without heat difference elimination;

[0050] Figure 2 Transfer function MTF diagram of the present application's aneroid human eye cone mirror without heat difference elimination at +23℃;

[0051] Figure 3 Transfer function MTF diagram of the present application's aneroid human eye cone mirror without heat difference elimination at +10℃;

[0052] Figure 4 Transfer function MTF diagram of the present application's aneroid human eye cone mirror without heat difference elimination at +40℃;

[0053] Figure 5 Transfer function MTF diagram of the present application's aneroid human eye cone mirror with heat difference elimination at +23℃;

[0054] Figure 6 Transfer function MTF diagram of the present application's aneroid human eye cone mirror with heat difference elimination at +10℃;

[0055] Figure 7 Transfer function MTF diagram of the present application's aneroid human eye cone mirror with heat difference elimination at +40℃;

[0056] Figure 8 Flare distribution diagram of the present application's aneroid human eye cone mirror with heat difference elimination at +23℃;

[0057] Figure 9 Flare distribution diagram of the present application's aneroid human eye cone mirror with heat difference elimination at +10℃;

[0058] Figure 10 Flare distribution diagram of the present application's aneroid human eye cone mirror with heat difference elimination at +40℃;

[0059] Figure 11 Comparison diagram of the present application's aneroid human eye cone mirror with and without heat difference elimination on axial optical transfer function with temperature change;

[0060] Wherein, G1-front lens group, G2-middle lens group, G3-rear lens group, G4-filter lens group, L01-first lens, L02-second lens, L03-third lens, L04-fourth lens, L05-fifth lens, L06-sixth lens, L07-seventh lens, L08-eighth lens, L09-ninth lens, L10-tenth lens, L11-eleventh lens, L12-twelfth lens, L13-thirteenth lens, L14-fourteenth lens, L15-fifteenth lens, L16-sixteenth lens, L17-seventeenth lens, L18-filter. DETAILED DESCRIPTION

[0061] Reference will now be made in detail to the embodiments of the present disclosure, one or more examples of which are set forth herein below. Each embodiment and example is provided by way of explanation of the present disclosure, not limitation. It will be apparent to those from the art that various modifications and variations can be made in the present disclosure without departing from the scope or spirit of the present disclosure. Thus, it is intended that the present disclosure cover modifications and variations of this disclosure provided they come within the scope of the appended claims and their equivalents.

[0062] As Figure 1 It is shown that a kind of athermal cone photomirror disclosed in the application, including the light path direction of being arranged in turn from object side to image side diaphragm, front lens group G1, middle lens group G2, rear lens group G3, filter lens group G4 and image plane;The front lens group G1 includes the first lens L01 with positive focal power, the second lens L02 and the third lens L03 and the fourth lens L04 that are mutually glued to form cemented lens, which are arranged in turn along the light path direction, the third lens L03 is negative focal power, and the fourth lens L04 is positive focal power;The focal power of the front lens group G1 satisfies-0.8 <-0.4, It is the focal length of front lens group, It is the focal length of cone photomirror, eliminate part of chromatic aberration and thermal difference by front lens group G1 Influence on the imaging of cone photomirror;The middle lens group G2 and rear lens group G3 are used for the relay imaging between front lens group G1 and image plane, and the focal power of middle lens group G2 satisfies 1.0 <2.0, It is the focal length of middle lens group, and the focal power of rear lens group G3 satisfies-3000 <-2000, It is the focal length of rear lens group, and the exit pupil distance of the diaphragm of the application satisfies 0.70 <1.0, It is the focal length of cone photomirror, It is the distance from the diaphragm to the surface of the first lens L01.

[0063] The front lens group G1 of the present application undertakes the function of compressing the outer diameter size of the whole catadioptric lens imaging system and eliminating part of chromatic aberration and thermal aberration, the middle lens group G2 and the rear lens group G3 undertake the relay imaging function, and the overall magnification satisfies 0.8 <1.5, wherein the middle lens group G2 is a complexification of Gauss lens, undertakes the function of relay and chromatic aberration and thermal aberration correction, the rear lens group G3 undertakes the function of chromatic aberration, thermal aberration and compression of chief ray angle on the image side, and the filter lens group G4 includes the filter L18 which constitutes a colorimeter.

[0064] In a specific embodiment, the object side of the first lens L01 of the present application is concave, the image side is convex, the optical power satisfies 0.01≤optical power≤0.015; the object side of the second lens L02 is convex, the image side is convex, the optical power satisfies 0.02≤optical power≤0.03; the object side of the third lens L03 is convex, the image side is concave, the optical power satisfies -0.005≤optical power≤-0.001; and the object side of the fourth lens L04 is convex, the image side is convex, the optical power satisfies 0.01≤optical power≤0.02.

[0065] The middle lens group G2 of the present application includes the fifth lens L05, the sixth lens L06, the seventh lens L07, the eighth lens L08, the ninth lens L09, the tenth lens L10, the eleventh lens L11 and the twelfth lens L12 which are sequentially arranged along the optical path direction;

[0066] The fifth lens L05 has positive optical power, the object side is convex, the image side is convex, and the optical power satisfies 0.01≤optical power≤0.02;

[0067] The sixth lens L06 has positive optical power, the object side is convex, the image side is concave or flat, and the optical power satisfies 0.015≤optical power≤0.025;

[0068] The seventh lens L07 has negative optical power, the object side is convex, the image side is concave, and the optical power satisfies -0.005≤optical power≤-0.001;

[0069] The eighth lens L08 has negative optical power, the object side is concave, the image side is concave, and the optical power satisfies -0.05≤optical power≤-0.03;

[0070] The ninth lens L09 has positive optical power, the object side is convex, the image side is concave, and the optical power satisfies 0.01≤optical power≤0.02;

[0071] The tenth lens L10 has negative optical power, the object side is concave, the image side is convex, and the optical power satisfies -0.1≤optical power≤-0.05;

[0072] The eleventh lens L11 has positive optical power, the object side is convex, the image side is convex, and the optical power satisfies 0.03≤optical power≤0.05;

[0073] The twelfth lens L12 has positive refractive power, is convex on the object side, is convex on the image side, and satisfies 0.01<=refractive power<=0.03.

[0074] The rear mirror group G3 of the present application comprises, in order along the optical path, a thirteenth lens L13, a fourteenth lens L14, a fifteenth lens L15, a sixteenth lens L16 and a seventeenth lens L17.

[0075] The thirteenth lens L13 has positive refractive power, is convex on the object side, is convex on the image side, and satisfies 0.02<=refractive power<=0.03.

[0076] The fourteenth lens L14 has negative refractive power, is concave on the object side, is concave on the image side, and satisfies -0.1<=refractive power<=-0.03.

[0077] The fifteenth lens L15 has negative refractive power, is concave on the object side, is concave on the image side, and satisfies -0.05<=refractive power<=-0.04.

[0078] The sixteenth lens L16 has negative refractive power, is convex on the object side, is convex on the image side, and satisfies 0.01<=refractive power<=0.03.

[0079] The seventeenth lens L17 has negative refractive power, is convex on the object side, is convex on the image side, and satisfies 0.015<=refractive power<=0.035.

[0080] The eighth lens L08 and the ninth lens L09, the tenth lens L10 and the eleventh lens L11, the thirteenth lens L13 and the fourteenth lens L14, and the fifteenth lens L15 and the sixteenth lens L16 are respectively glued to form a glued lens group, so as to correct imaging chromatic aberration.

[0081] Through the above lens structure design, each mirror group can realize the corresponding function, in addition, in order to improve the athermal effect of the conical lens, the thermal difference coefficient of each lens of the conical lens is designed to ensure the athermal effect, realize that the optical performance of the conical lens remains basically unchanged in the range of +10 DEG C to +40 DEG C, improve the detection accuracy of the colorimeter, and the each lens of the conical lens of the present application satisfies the athermal condition , is the refractive power of each lens; is the total refractive power of the conical lens; m represents the number of lenses, is the projection height of the first near-axis light on the surface of each lens; is the athermal coefficient of the lens; is the thermal expansion coefficient of the mechanical lens barrel of the conic lens; L is the initial length of the structural member of the mechanical lens barrel of the conic lens; the change amount of the focal length of the optical assembly of the conic lens caused by temperature is equal to the change amount of the mechanical lens barrel where the conic lens is located with temperature, that is, the image surface of the optical system is moved with the movement of the photosensitive surface by the passive compensation method, and the whole system does not produce defocus.

[0082] Specifically, the refractive index range of the first lens L01 of the present application is 1.55≤n≤1.65, the dispersion range is 57≤D≤65, and the athermalization coefficient range is -17E-06≤ ≤-13E-06;

[0083] The refractive index range of the second lens L02 is 1.55≤n≤1.65, the dispersion range is 52≤D≤55, and the athermalization coefficient range is -3E-06≤ ≤-1.5E-06;

[0084] The refractive index range of the third lens L03 is 1.78≤n≤1.85, the dispersion range is 33≤D≤38, and the athermalization coefficient range is 5.5E-06≤ ≤6.5E-06;

[0085] The refractive index range of the fourth lens L04 is 1.68≤n≤1.75, the dispersion range is 45≤D≤55, and the athermalization coefficient range is -1.5E-06≤ ≤-0.5E-06;

[0086] The refractive index range of the fifth lens L05 is 1.68≤n≤1.77, the dispersion range is 45≤D≤55, and the athermalization coefficient range is -35E-06≤ ≤-25E-06;

[0087] The refractive index range of the sixth lens L06 is 1.58≤n≤1.65, the dispersion range is 59≤D≤65, and the athermalization coefficient range is -5.0E-06≤ ≤-3.0E-06;

[0088] The refractive index range of the seventh lens L07 is 1.61≤n≤1.68, the dispersion range is 30≤D≤35, and the athermalization coefficient range is 3.0E-06≤ ≤5.0E-06;

[0089] The refractive index range of the eighth lens L08 is 1.68≤n≤1.75, the dispersion range is 25≤D≤31, and the athermalization coefficient range is -10.0E-06≤ ≤-7.0E-06;

[0090] The ninth lens L09 has a refractive index range of 1.55≤n≤1.65, a dispersion range of 45≤D≤55, and an athermalization coefficient range of -3.5E-06≤ ≤-5.0E-06;

[0091] The tenth lens L10 has a refractive index range of 1.78≤n≤1.87, a dispersion range of 21≤D≤25, and an athermalization coefficient range of -10.0E-06≤ ≤-8.5E-06;

[0092] The eleventh lens L11 has a refractive index range of 1.60≤n≤1.69, a dispersion range of 55≤D≤65, and an athermalization coefficient range of -2.0E-06≤ ≤-1.0E-06;

[0093] The twelfth lens L12 has a refractive index range of 1.81≤n≤1.87, a dispersion range of 20≤D≤25, and an athermalization coefficient range of -3.5E-06≤ ≤-2.4E-06;

[0094] The thirteenth lens L13 has a refractive index range of 1.55≤n≤1.65, a dispersion range of 62≤D≤70, and an athermalization coefficient range of -30E-06≤ ≤-24E-06;

[0095] The fourteenth lens L14 has a refractive index range of 1.70≤n≤1.75, a dispersion range of 25≤D≤30, and an athermalization coefficient range of -10E-06≤ ≤-6E-06;

[0096] The fifteenth lens L15 has a refractive index range of 1.70≤n≤1.75, a dispersion range of 25≤D≤30, and an athermalization coefficient range of -10E-06≤ ≤-6E-06;

[0097] The sixteenth lens L16 has a refractive index range of 1.61≤n≤1.68, a dispersion range of 45≤D≤55, and an athermalization coefficient range of -3.0E-06≤ ≤-2.0E-06;

[0098] The seventeenth lens L17 has a refractive index range of 1.68≤n≤1.78, a dispersion range of 60≤D≤70, and an athermalization coefficient range of -35E-06≤ ≤-25E-06.

[0099] As shown in Table 1, the present application gives a specific parameters of the lens of the conoscopic lens:

[0100] Table 1 Conoscope lens parameter table

[0101]

[0102] The surfaces of the lens are numbered in the order S01-S33 from the object side to the image side. The aperture surface is recorded as S01, the image side surface is recorded as S33, and the cemented surfaces of the lens are regarded as the same surface.

[0103] The optical power and athermal coefficient of each lens in the embodiment of the present invention are shown in Table 2:

[0104] Table 2 Conoscope lens optical power and athermal coefficient

[0105]

[0106] The rightmost column in Table 2 is The calculated values ​​of each lens can be seen from Table 2. = -0.488; substituting the athermal difference condition into the left-hand side value of the athermal difference condition for each lens, the value on the left side of the athermal difference condition is -7625E-06; and calculating the total length of the mechanical barrel structure as 324.4 mm, the value on the right side of the athermal difference formula is -23.5E-06*324.4=-7625E-06, thereby verifying that the conoscope lens implemented in this application meets the athermal difference condition formula, where E-06 is scientific notation, representing 10 to the power of -6.

[0107] like Figures 2-10 As shown, the present invention Figures 2-4 The optical transfer function (MTF) graphs of a conventional athermalized human eye conoscope lens at +23°C, +10°C, and +40°C are given. It can be clearly seen that at +40°C the MTF of the optical transfer function at 35 line pairs / mm (30 line pairs / degree) decreases by about 20% compared to that at +23°C; and at +23°C the MTF of the optical transfer function at 35 line pairs / mm (30 line pairs / degree) decreases by about 20% compared to that at +23°C. This shows the impact of temperature changes on the performance of optical lenses.

[0108] The present invention Figures 5-7 As shown in FIG. 1 , the optical transfer function MTF diagram of the athermal human eye conoscope lens of the present invention at +23°C, +10°C, and +40°C is given. Figures 8-10 The light spot distribution diagrams of the athermalized human eye conoscope lens of the present invention are presented at +23°C, +10°C, and +40°C. The MTF (Transfer Function) and light spot distribution, which characterize the optical performance, remain essentially unchanged. The conoscope lens of the present invention can achieve an athermal effect when the temperature changes, thereby ensuring the optical performance of the lens.

[0109] Figure 11The optical transfer function MTF of the existing non-achromatic conic lens and the MTF of the achromatic conic lens of the present application change with temperature in the range of +10-+40℃. After the achromatic treatment, the MTF remains consistent in a wide temperature range, ensures the performance stability of the detection equipment, and can ensure the accuracy and stability of the detection of the target to be detected.

Claims

1. A athermal lens that simulates the conoscope of human eyes, characterized in that: The invention comprises an aperture, a front lens group (G1), a middle lens group (G2), a rear lens group (G3), a filter lens group (G4) and an image plane, which are sequentially arranged in the optical path direction from the object side to the image side; the front lens group (G1) comprises a first lens (L01) and a second lens (L02) with positive optical power, and a third lens (L03) and a fourth lens (L04) cemented together to form a cemented lens, wherein the third lens (L03) has a negative optical power and the fourth lens (L04) has a positive optical power; the optical power of the front lens group (G1) satisfies -0.8< <-0.4, is the focal length of the front lens group, is the focal length of the conoscope lens, and the influence of chromatic aberration and thermal difference on the conoscope lens imaging is partially eliminated by the front lens group (G1); the middle lens group (G2) and the rear lens group (G3) are used for relay imaging between the front lens group (G1) and the image plane, and the optical power of the middle lens group (G2) satisfies 1.0< <2.0, is the focal length of the middle lens group, and the focal length of the rear lens group (G3) satisfies -3000< <-2000, is the focal length of the rear lens group; The object side of the first lens (L01) is concave, the image side is convex, and the optical power is 0.01≤≤0.015; the object side of the second lens (L02) is convex, the image side is convex, and the optical power is 0.02≤≤0.03; the object side of the third lens (L03) is convex, the image side is concave, and the optical power is -0.005≤≤-0.001; the object side of the fourth lens (L04) is convex, the image side is concave, and the optical power is 0.01≤≤0.02; The middle lens group (G2) includes a fifth lens (L05), a sixth lens (L06), a seventh lens (L07), an eighth lens (L08), a ninth lens (L09), a tenth lens (L10), an eleventh lens (L11) and a twelfth lens (L12) arranged in sequence along the optical path; The rear lens group (G3) includes a thirteenth lens (L13), a fourteenth lens (L14), a fifteenth lens (L15), a sixteenth lens (L16) and a seventeenth lens (L17) arranged in sequence along the optical path.

2. The athermal human eye-simulating conoscope lens according to claim 1, characterized in that: The fifth lens (L05) has positive refractive power, a convex surface on the object side and a convex surface on the image side, and an optical power of 0.01 ≤ ≤ 0.02; The sixth lens (L06) has positive refractive power, a convex surface on the object side, a concave or flat surface on the image side, and an optical power of 0.015 ≤ ≤ 0.025; The seventh lens (L07) has negative optical power, with a convex surface on the object side and a concave surface on the image side, and an optical power of -0.005 ≤ ≤ -0.

001. The eighth lens (L08) has negative optical power, with a concave surface on the object side and a concave surface on the image side, and an optical power of -0.05 ≤ ≤ -0.03; The ninth lens (L09) has positive refractive power, a convex surface on the object side and a concave surface on the image side, and an optical power of 0.01 ≤ ≤ 0.02; The tenth lens (L10) has negative optical power, a concave surface on the object side, a concave surface on the image side, and an optical power of -0.1 ≤ ≤ -0.05; The eleventh lens (L11) has positive refractive power, a convex surface on the object side and a convex surface on the image side, and an optical power of 0.03 ≤ ≤ 0.05; The twelfth lens (L12) has positive refractive power, a convex surface on the object side, a convex surface on the image side, and a refractive power of 0.01≤≤0.

03.

3. The athermal human eye-simulating conoscope lens according to claim 2, characterized in that: The thirteenth lens (L13) has positive refractive power, a convex surface on the object side and a convex surface on the image side, and an optical power of 0.02 ≤ ≤ 0.03; The fourteenth lens (L14) has negative optical power, with a concave surface on the object side and a concave surface on the image side, and an optical power of -0.1 ≤ ≤ -0.03; The fifteenth lens (L15) has negative refractive power, with a concave surface on the object side and a concave surface on the image side, and a refractive power of -0.05 ≤ ≤ -0.04; The sixteenth lens (L16) has negative refractive power, a convex surface on the object side and a convex surface on the image side, and a refractive power of 0.01 ≤ ≤ 0.03; The seventeenth lens (L17) has negative refractive power, a convex surface on the object side, a convex surface on the image side, and a refractive power of 0.015≤≤0.

035.

4. The athermal human eye-simulating conoscope lens according to claim 3, characterized in that: Each lens of the conoscope lens meets the athermal difference condition , is the optical power of each lens; is the total optical power of the conoscope lens; m represents the number of lenses, is the projection height of the first paraxial ray on each lens surface; is the athermal coefficient of the lens; is the thermal expansion coefficient of the mechanical barrel of the conoscope lens; L is the initial length of the structural parts of the mechanical barrel of the conoscope lens.

5. The athermal human eye-simulating conoscope lens according to claim 4, characterized in that: The refractive index range of the first lens (L01) is 1.55≤n≤1.65, the dispersion range is 57≤D≤65, and the athermal coefficient range is -17E-06≤ ≤-13E-06; The refractive index range of the second lens (L02) is 1.55≤n≤1.65, the dispersion range is 52≤D≤55, and the athermal coefficient range is -3E-06≤ ≤-1.5E-06; The refractive index range of the third lens (L03) is 1.78≤n≤1.85, the dispersion range is 33≤D≤38, and the athermal coefficient range is 5.5E-06≤ ≤6.5E-06; The refractive index range of the fourth lens (L04) is 1.68≤n≤1.75, the dispersion range is 45≤D≤55, and the athermal coefficient range is -1.5E-06≤ ≤-0.5E-06; The refractive index range of the fifth lens (L05) is 1.68≤n≤1.77, the dispersion range is 45≤D≤55, and the athermal coefficient range is -35E-06≤ ≤-25E-06; The refractive index range of the sixth lens (L06) is 1.58≤n≤1.65, the dispersion range is 59≤D≤65, and the athermal coefficient range is -5.0E-06≤ ≤-3.0E-06; The refractive index range of the seventh lens (L07) is 1.61≤n≤1.68, the dispersion range is 30≤D≤35, and the athermal coefficient range is 3.0E-06≤ ≤5.0E-06; The refractive index range of the eighth lens (L08) is 1.68≤n≤1.75, the dispersion range is 25≤D≤31, and the athermal coefficient range is -10.0E-06≤ ≤-7.0E-06; The refractive index range of the ninth lens (L09) is 1.55≤n≤1.65, the dispersion range is 45≤D≤55, and the athermal coefficient range is -3.5E-06≤ ≤-5.0E-06; The refractive index range of the tenth lens (L10) is 1.78≤n≤1.87, the dispersion range is 21≤D≤25, and the athermal coefficient range is -10.0E-06≤ ≤-8.5E-06; The refractive index range of the eleventh lens (L11) is 1.60≤n≤1.69, the dispersion range is 55≤D≤65, and the athermal coefficient range is -2.0E-06≤ ≤-1.0E-06; The refractive index range of the twelfth lens (L12) is 1.81≤n≤1.87, the dispersion range is 20≤D≤25, and the athermal coefficient range is -3.5E-06≤ ≤-2.4E-06; The refractive index range of the thirteenth lens (L13) is 1.55≤n≤1.65, the dispersion range is 62≤D≤70, and the athermal coefficient range is -30E-06≤ ≤-24E-06; The refractive index range of the fourteenth lens (L14) is 1.70≤n≤1.75, the dispersion range is 25≤D≤30, and the athermal coefficient range is -10E-06≤ ≤-6E-06; The refractive index range of the fifteenth lens (L15) is 1.70≤n≤1.75, the dispersion range is 25≤D≤30, and the athermal coefficient range is -10E-06≤ ≤-6E-06; The refractive index range of the sixteenth lens (L16) is 1.61≤n≤1.68, the dispersion range is 45≤D≤55, and the athermal coefficient range is -3.0E-06≤ ≤-2.0E-06; The refractive index range of the seventeenth lens (L17) is 1.68≤n≤1.78, the dispersion range is 60≤D≤70, and the athermal coefficient range is -35E-06≤ ≤-25E-06.

6. The athermal human eye-simulating conoscope lens according to claim 3, characterized in that: The eighth lens (L08) and the ninth lens (L09), the tenth lens (L10) and the eleventh lens (L11), the thirteenth lens (L13) and the fourteenth lens (L14), and the fifteenth lens (L15) and the sixteenth lens (L16) are respectively cemented in pairs to form a cemented lens group to correct imaging chromatic aberration.

7. The athermal human eye-simulating conoscope lens according to claim 1, characterized in that: The overall magnification of the middle lens group (G2) and the rear lens group (G3) satisfies 0.8 < <1.

5.

8. The athermal human eye-simulating conoscope lens according to claim 1, characterized in that: The aperture exit pupil distance satisfies 0.70< <1.0, is the focal length of the conoscope lens, is the distance from the aperture to the front surface of the first lens (L01).

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