Athermalization human-eye-simulated cone-light lens

Abstract

The athermalization human-eye-simulated conoscopic lens comprises a diaphragm, a front lens group, a middle lens group, a rear lens group, a filter lens group and an image surface which are sequentially arranged in the light path direction from an object side to an image side, the front lens group comprises a first lens and a second lens which have positive focal power, and a third lens and a fourth lens which are mutually glued to form a glued lens, the third lens has negative focal power, and the fourth lens has positive focal power; through the configuration of each lens group of the conoscopic lens, the optical performance is basically kept unchanged within the range of + 10 DEG C to + 40 DEG C, the working environment temperature fluctuation and the performance reduction of a colorimeter caused by the temperature rise due to the fact that heat is transmitted to the lens after the camera works and heats for a long time can be eliminated, and the test accuracy is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of conoscopy lenses, and in particular to an athermal conoscopy lens that simulates a human eye. Background Art

[0002] Testing virtual reality devices like VR / AR requires a conoscope lens that simulates the size, position, and field of view of the human eye. Unlike traditional lenses with apertures located inside the lens, the aperture of VR / AR lenses is located in front of the lens, allowing for full NED capture without obstruction. Colorimeters used for VR / AR testing typically consist of a conoscope lens with an XYZ filter, a neutral energy attenuator (NEA), and a large-format monochrome industrial camera. Although the operating temperature is controlled during operation, the optical performance of the conoscope lens degrades with temperature due to prolonged camera operation and ambient temperature fluctuations. This degrades the accuracy of colorimeter testing and makes it impossible to guarantee the optical performance of the conoscope lens. Summary of the Invention

[0003] Technical purpose: To address the shortcoming that the optical performance of the conoscope lens of existing virtual reality equipment is affected by temperature changes, the present invention discloses an athermalized conoscope lens that simulates the human eye.

[0004] Technical solution: To achieve the above technical objectives, the present invention adopts the following technical solution: An athermal aberration-imitation human eye conoscope lens, comprising an aperture, a front lens group, a middle lens group, a rear lens group, a filter group, and an image plane, arranged in sequence along the optical path from the object side to the image side; the front lens group comprises a first lens and a second lens, each having positive focal power, and a third lens and a fourth lens, each of which is cemented together to form a cemented lens, the third lens having negative focal power and the fourth lens having 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 conoscope lens, and the influence of some chromatic aberration and thermal difference on the conoscope lens imaging is eliminated by the front lens group; the middle lens group and the rear lens group are used for relay imaging between the front lens group and the image plane, and the optical power of the middle lens group meets 1.0< <2.0, is the focal length of the middle lens group, and the focal length of the rear lens group satisfies -3000< <-2000, is the focal length of the rear lens group.

[0005] Preferably, the object side of the first lens of the present invention is concave, the image side is convex, and the optical power is 0.01≤≤0.015; the object side of the second lens is convex, the image side is convex, and the optical power is 0.02≤≤0.03; the object side of the third lens is convex, the image side is concave, and the optical power is -0.005≤≤-0.001; the object side of the fourth lens is convex, the image side is convex, and the optical power is 0.01≤≤0.02.

[0006] Preferably, the middle lens group of the present invention includes 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; The fifth lens 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 has positive 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 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 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 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 has negative optical power, a concave surface on the object side and a convex surface on the image side, and an optical power of -0.1 ≤ ≤ -0.05; The eleventh lens 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 has positive refractive power, a convex surface on the object side, a convex surface on the image side, and an optical power of 0.01≤≤0.03.

[0007] Preferably, the rear lens assembly of the present invention comprises a thirteenth lens, a fourteenth lens, a fifteenth lens, a sixteenth lens and a seventeenth lens arranged in sequence along the optical path; The thirteenth lens 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 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 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 has negative optical power, a convex surface on the object side and a convex surface on the image side, and an optical power of 0.01 ≤ ≤ 0.03; The seventeenth lens 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.

[0008] Preferably, each lens of the conoscope lens of the present invention satisfies 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.

[0009] Preferably, the refractive index range of the first lens of the present invention 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 is 1.68≤n≤1.78, the dispersion range is 60≤D≤70, and the athermal coefficient range is -35E-06≤ ≤-25E-06.

[0010] 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 invention are cemented in pairs to form cemented lens groups to correct imaging chromatic aberration.

[0011] Preferably, the magnification ratio of the middle lens group and the rear lens group of the present invention satisfies 0.8 < <1.5.

[0012] Preferably, the aperture exit pupil distance of the present invention 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.

[0013] Beneficial effects: The athermal human eye-simulating conoscope lens disclosed in the present invention has the following beneficial effects: 1. By configuring the various lens groups of the conoscope lens and utilizing the principle of passive optical athermalization, the present invention achieves essentially unchanged optical performance within the range of +10°C to +40°C. This eliminates fluctuations in the operating environment temperature and the degradation of the colorimeter performance caused by heat transfer from the camera to the lens after long-term operation, thereby improving test accuracy.

[0014] 2. The present invention compresses the outer diameter of the entire conoscope lens imaging system and eliminates some thermal differences of chromatic aberration during the conoscope lens imaging process through the first to fourth lenses of the front lens group.

[0015] 3. The middle lens group and the rear lens group of the present invention jointly undertake the relay imaging function. The middle lens group is a complication of the Gauss lens and undertakes the functions of relay and chromatic aberration and thermal difference correction, while the rear lens group undertakes the functions of chromatic aberration, thermal difference and compressing the image side chief ray angle.

[0016] 4. The present invention designs the range of the lens athermal difference coefficient of the conoscope lens so that the entire conoscope lens meets the athermal difference condition. During the use of the conoscope lens, passive compensation is performed so that the image plane of the conoscope lens optical system moves with the movement of the detector's photosensitive surface, and the entire system does not produce defocus. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for describing the embodiments or the prior art.

[0018] Figure 1 This is a structural diagram of the athermal human eye-simulating conoscope lens of the present invention; Figure 2 This is the MTF graph of the conoscopic lens transfer function at +23℃ without athermalization and simulating the human eye; Figure 3 This is the MTF graph of the conoscopic lens transfer function at +10℃ without athermalization and simulating the human eye; Figure 4 This is the MTF graph of the conoscopic lens transfer function at +40℃ without athermalization and simulating the human eye; Figure 5 This is the MTF diagram of the athermal human eye conoscope lens transfer function at +23°C of the present invention; Figure 6This is the MTF diagram of the +10°C athermal human eye conoscope lens transfer function of the present invention; Figure 7 This is the MTF diagram of the +40°C athermal human eye conoscope lens transfer function of the present invention; Figure 8 This is the spot distribution diagram of the +23℃ athermalized human eye cone lens of the present invention; Figure 9 This is the spot distribution diagram of the +10℃ athermalized human eye conoscope lens of the present invention; Figure 10 This is the light spot distribution diagram of the +40℃ athermalized human eye cone lens of the present invention; Figure 11 A comparison of the on-axis optical transfer function of the athermal and athermal conoscope lenses of the present invention as a function of temperature; Among them, G1-front lens group, G2-middle lens group, G3-rear lens group, G4-filter 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

[0019] 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 apparatus, composition, and materials of the present disclosure, and is not intended to be limiting. On the contrary, the following description provides a convenient illustration of exemplary embodiments for implementing the present disclosure. In fact, it will be apparent to those skilled in the art that various modifications and variations can be made within the teachings of the present disclosure without departing from the scope or spirit of the present disclosure.

[0020] like Figure 1 The present invention discloses an athermal conoscope lens emulating the human eye, comprising an aperture, a front lens group G1, a middle lens group G2, a rear lens group G3, a filter group G4, and an image plane, arranged sequentially along the optical path from the object side to the image side. The front lens group G1 comprises a first lens L01 and a second lens L02, each having positive optical power, and a third lens L03 and a fourth lens L04, which are cemented together to form a cemented lens. The third lens L03 has negative optical power, and the fourth lens L04 has positive optical power. The optical power of the front lens group G1 satisfies the requirement of -0.8 < 0.01. <-0.4, is the focal length of the front lens group, is the focal length of the conoscope lens, and the front lens group G1 is used to eliminate the influence of some chromatic aberration and thermal difference on the conoscope lens imaging; 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 meets 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, and the aperture exit pupil distance of the present invention satisfies 0.70< <1.0, is the focal length of the conoscope lens, is the distance from the aperture to the surface of the first lens L01.

[0021] The front lens group G1 of the present invention is responsible for compressing the outer diameter of the entire conoscope lens imaging system and eliminating some chromatic aberration and thermal difference. The middle lens group G2 and the rear lens group G3 are responsible for relay imaging. The overall magnification meets 0.8< <1.5, where the middle lens group G2 is a complication of the Gauss lens, and is responsible for relaying and correcting chromatic aberration and thermal difference. The rear lens group G3 is responsible for chromatic aberration, thermal difference and compressing the image side chief ray angle. The filter group G4 includes the filter L18 that constitutes the colorimeter.

[0022] In a specific embodiment, the first lens L01 of the present invention has a concave surface on its object side and a convex surface on its image side, with an optical power of 0.01 ≤ ≤ 0.015; the second lens L02 has a convex surface on its object side and a convex surface on its image side, with an optical power of 0.02 ≤ ≤ 0.03; the third lens L03 has a convex surface on its object side and a concave surface on its image side, with an optical power of -0.005 ≤ ≤ -0.001; and the fourth lens L04 has a convex surface on its object side and a convex surface on its image side, with an optical power of 0.01 ≤ ≤ 0.02.

[0023] The middle lens group G2 of the present invention 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, which are sequentially arranged along the optical path. The fifth lens L05 has positive refractive power, a convex surface on the object side and a convex surface on the image side, and a refractive power of 0.01 ≤ ≤ 0.02; The sixth lens L06 has positive refractive power, a convex surface on the object side and a concave or flat surface on the image side, and an optical power of 0.015 ≤ ≤ 0.025; The seventh lens L07 has negative refractive power, with a convex surface on the object side and a concave surface on the image side, and a refractive power of -0.005 ≤ ≤ -0.001. The eighth lens L08 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 ≤ ≤ -0.03. 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 refractive power, a concave surface on the object side and a convex surface on the image side, and a refractive 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 a refractive 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.

[0024] The rear lens group G3 of the present invention 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; The thirteenth lens L13 has positive refractive power, a convex surface on the object side and a convex surface on the image side, and a refractive power of 0.02≤≤0.03; The fourteenth lens L14 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 -0.1 ≤ ≤ -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 and a convex surface on the image side, and a refractive power of 0.015≤≤0.035.

[0025] 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 cemented in pairs to form cemented lens groups to correct imaging chromatic aberration.

[0026] Through the above lens structure design, each lens group can achieve the corresponding function. In addition, in order to improve the athermal difference effect of the conoscope lens, the present invention also designs the thermal difference coefficient of each lens of the conoscope lens to ensure the athermal difference effect, so that the optical performance of the conoscope lens remains basically unchanged in the range of +10℃ to +40℃, and the detection accuracy of the colorimeter is improved. Each lens of the conoscope lens of the present invention 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 components of the mechanical barrel of the conoscope lens; the change in the focal length of the optical assembly of the conoscope lens caused by temperature is equal to the change in the mechanical barrel where the conoscope lens is located with temperature, that is, the image plane of the optical system moves with the movement of the photosensitive surface through the method of passive compensation, and the entire system does not produce defocus.

[0027] Specifically, the refractive index range of the first lens L01 of the present invention 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.

[0028] As shown in Table 1, the present invention provides a specific lens parameter of a conoscope lens: Table 1 Conoscope lens parameter table

[0029] 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.

[0030] The optical power and athermal coefficient of each lens in the embodiment of the present invention are shown in Table 2: Table 2 Conoscope lens optical power and athermal coefficient

[0031] 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.

[0032] like Figure 2-Figure 10 As shown, the present invention Figure 2-Figure 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.

[0033] The present invention Figure 5-Figure 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.

[0034] Figure 11 The optical transfer function (MTF) of an existing athermalized conoscope lens and an athermalized human eye-simulating conoscope lens of the present invention are shown as a function of temperature from +10°C to +40°C. After athermalization, the MTF remains consistent over a wide temperature range, ensuring stable performance of the detection equipment and the accuracy and stability of target detection.

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.

2. The athermal human eye-simulating conoscope lens according to claim 1, characterized in that: 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 convex, and the optical power is 0.01≤≤0.

02.

3. The athermal human eye-simulating conoscope lens according to claim 2, characterized in that: 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 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 and a convex 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.

4. The athermal human eye-simulating conoscope lens according to claim 3, characterized in that: 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; 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.

5. The athermal human eye-simulating conoscope lens according to claim 4, 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.

6. The athermal human eye-simulating conoscope lens according to claim 5, 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.

7. The athermal human eye-simulating conoscope lens according to claim 4, 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.

8. The athermal human eye-simulating conoscope lens according to claim 2, characterized in that: The overall magnification of the middle lens group (G2) and the rear lens group (G3) satisfies 0.8 < <1.

5.

9. 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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