A large aperture transmission type optical lens surface precision temperature control method and optical lens

Abstract

The present application relates to a kind of large aperture transmission type optical lens surface precision temperature control method and optical lens, solve the technical problem that existing technology exists local hot spot when lens surface is plated ITO heating film and is heated, cause the local thermal deformation of lens glass, thereby lead to thermal light dispersion, affect the imaging quality.The present application includes lens assembly, ITO conductive film, auxiliary voltage regulating heater and light shield;ITO conductive film is divided into conductive channel, pad is set at the intersection of the center line of conductive channel and ITO conductive film, auxiliary voltage regulating heater is connected with pad, for the conductive channel outer auxiliary resistance;Because the sum of channel resistance and auxiliary resistance is equal, the current on each conductive channel is equal;Temperature control thermistor is provided at the edge of the surface of lens assembly, for collecting and monitoring the temperature change of lens when heating, according to the temperature data collected, the voltage of additional is controlled, the temperature level control of lens surface is realized.

Description

TECHNICAL FIELD

[0001] The application relates to a temperature control method of an optical lens and the optical lens, in particular to a precise temperature control method of a lens surface of a large-aperture transmission type optical lens and the optical lens. BACKGROUND

[0002] With the development of space astronomical observation technology, the observation demand for space targets is also increasing. When a large field of view is observed, a large-aperture lens type optical lens needs to be used to obtain a target image. However, in a cold black space background, the outermost lens surface of the optical lens will appear to have a low center temperature and a high peripheral temperature due to radiation heat dissipation. With the change of the temperature difference, a large temperature gradient causes thermal deformation of the lens, and then causes the focal point of the optical system to drift, the energy concentration test to be substandard, and the astigmatism phenomenon to occur, thereby affecting the observation performance.

[0003] In order to solve the above problems, an ITO (indium tin oxide) conductive film can be plated on the lens surface. The ITO conductive film has good light transmittance, and the temperature gradient of the lens surface can be reduced by heating the lens surface, thereby reducing the risk of thermal deformation and improving the observation performance.

[0004] However, in order to adapt to the shape of the lens, the positive and negative electrodes of the ITO conductive film often adopt a circular arc pad design. This design will cause local hot spots to form on the lens surface, and then cause the thermal light dispersion phenomenon to occur, thereby affecting the imaging quality of the optical system. The thermal light dispersion refers to the fact that the refractive index of different wavelengths of light in the lens is different due to the uneven temperature distribution of the lens surface.

[0005] In order to meet the in-orbit temperature control requirement of the high temperature uniformity of the lens of the large-aperture transmission type optical lens, a precise temperature control system needs to be designed for the outermost lens surface. SUMMARY

[0006] The purpose of the application is to solve the technical problems that the existing technology causes local thermal deformation of the lens glass and affects the imaging quality due to the local hot spots caused by the ITO heating film plated on the lens surface, and to provide a precise temperature control method of a lens surface of a large-aperture transmission type optical lens and the optical lens.

[0007] The idea of the application is to use the idea of heating circuit splicing to ensure the temperature consistency of the lens in the laboratory environment and in the on-orbit environment, to ensure the temperature uniformity of the lens surface, to avoid the local thermal deformation of the lens glass caused by the local hot spots, and to connect the ITO conductive film of the lens surface and the auxiliary voltage regulating heater through a plurality of wires by designing the auxiliary voltage regulating heater, so as to ensure the uniform distribution of the current of the ITO conductive film and to avoid the local thermal deformation.

[0008] In order to achieve the above-mentioned purpose, realize the above-mentioned idea, the technical solutions provided by the present application are as follows:

[0009] A large aperture transmission type optical lens surface precision temperature control method, which is characterized by comprising the following steps:

[0010] S1, distinguish the conductive channel

[0011] A rectangular coordinate system is established with the center of the lens surface as the origin, the horizontal axis is denoted as the x-axis, and the vertical axis is denoted as the y-axis;

[0012] The ITO conductive film of the lens surface is divided into N conductive channels along the y-axis from positive to negative, so that the width of each conductive channel is 4-16 mm, and the center line of the conductive channel is parallel to the x-axis; the channel resistance of each conductive channel is Ri, i is the label of the conductive channel at different positions, and the value range of i is 1-N;

[0013] S2, external auxiliary resistance

[0014] For conductive channels at different positions, different auxiliary resistances Rai are connected, so that the sum of the channel resistance and the corresponding auxiliary resistance of each conductive channel Ri+Rai satisfies: R1+Ra1=R2+Ra2=……=RN+RaN;

[0015] S3, external heating voltage

[0016] The same heating voltage is applied to each conductive channel and the corresponding auxiliary resistance, so that the transverse current on each conductive channel is uniform; since the resistance values of the channel resistance Ri and the auxiliary resistance Rai at different positions are the same, the current on each conductive channel is uniform, so that each part of the ITO conductive film can be uniformly heated, ensuring the uniformity of the lens surface temperature;

[0017] S4, collecting temperature data

[0018] Thermistors are arranged at the edges of the lens surface to collect the temperature during heating;

[0019] S5, closed loop precision temperature control

[0020] The collected temperature data is judged and processed, if the temperature of the lens surface meets the heating requirement, the applied heating voltage is maintained unchanged, and the heating continues;

[0021] If the temperature of the lens surface does not meet the heating requirement, the heating voltage applied to each conductive channel and the corresponding auxiliary resistance is adjusted, when the collected temperature is higher than the required heating temperature, the heating voltage is reduced, and when the collected temperature is lower than the required heating temperature, the heating voltage is increased, forming a closed loop temperature control; after the adjustment is completed, return to step S3 to form a closed loop temperature control, and realize the precision temperature control of the lens surface.

[0022] Further, in S2, the maximum value of the sum Ri+Rai of the channel resistances of the N conductive channels and the corresponding auxiliary resistances is denoted as Rm, so that Ri+Rai satisfies: R1+Ra1=R2+Ra2=……=RN+RaN=Rm; the maximum value Rm is the maximum value among the N different channel resistances Ri.

[0023] The application also provides a large-aperture transmission optical lens adopting the large-aperture transmission optical lens lens surface precision temperature control method, and the speciality thereof is that:

[0024] The lens assembly comprises an outer cylinder, a lens installed in the outer cylinder, an ITO conductive film plated on one side surface of the lens, and a light shield installed on the same side of the lens assembly and the ITO conductive film.

[0025] The lens assembly comprises an outer cylinder, a lens installed in the outer cylinder, an ITO conductive film plated on one side surface of the lens, and a light shield installed on the same side of the lens assembly and the ITO conductive film.

[0026] Definition: a rectangular coordinate system is established with the center of the lens as the origin, the horizontal axis is denoted as the x-axis, and the vertical axis is denoted as the y-axis.

[0027] The ITO conductive film is divided into N conductive channels along the y-axis from positive to negative, so that the width of each conductive channel is 4-16 mm, and the center line of the conductive channel is parallel to the x-axis.

[0028] 2N pads are arranged at the intersection of the center line of the N conductive channels and the outer periphery of the ITO conductive film, the pads comprise N positive pads in the negative region of the x-axis and N negative pads in the positive region of the x-axis.

[0029] The output end of the auxiliary voltage regulating heater is connected with the N positive pads and the N negative pads, respectively, for connecting auxiliary resistances to the N conductive channels, so that the transverse channel resistance on each conductive channel is equal to the sum of the corresponding auxiliary resistances on the auxiliary voltage regulating heater, the input end of the auxiliary voltage regulating heater is connected with an external control module, for applying a heating voltage to the positive pads and the negative pads corresponding to each conductive channel, so that the conductive channel is turned on and starts heating, and since the sum of the channel resistance and the auxiliary resistance is equal, the current on each conductive channel is equal.

[0030] The lens is provided with a temperature control thermistor at the surface edge, for collecting and monitoring the temperature change of the lens during heating, the output end of the temperature control thermistor is connected with an external control module, for controlling the heating voltage according to the collected temperature change, so as to realize the temperature control of the lens surface.

[0031] Further, define: the x-axis negative y-axis positive region of the lens surface, the x-axis negative y-axis negative region, the x-axis positive y-axis positive region and the x-axis positive y-axis negative region of the lens surface are A, B, C, D respectively;

[0032] The auxiliary voltage heating device includes a first heating sheet, a second heating sheet, a third heating sheet and a fourth heating sheet, which correspond to the ITO conductive film on the lens surface A, B, C and D respectively.

[0033] The input end of the first heating sheet and the second heating sheet is provided with N first lead bonding pads for external connection of positive voltage, and the output end is provided with corresponding N second lead bonding pads, which correspond to the N positive bonding pads of the ITO conductive film in the A and B regions.

[0034] The input end of the third heating sheet and the fourth heating sheet is provided with N third lead bonding pads for external connection of negative voltage, and the output end is provided with corresponding N fourth lead bonding pads, which correspond to the N negative bonding pads of the ITO conductive film in the C and D regions.

[0035] Further, the width of each conductive channel is equal.

[0036] The first heating sheet, the second heating sheet, the third heating sheet and the fourth heating sheet are arc straight triangle structures, the straight angle edge perpendicular to the x-axis is the input end, and the arc edge is the output end.

[0037] The arc edge of the arc triangle structure is matched with the outer peripheral edge of the ITO conductive film, so that the ITO conductive film and the first heating sheet, the second heating sheet, the third heating sheet and the fourth heating sheet can be spliced into a rectangle, and in the rectangle, the first lead bonding pad, the second lead bonding pad, the third lead bonding pad and the fourth lead bonding pad are respectively connected with the corresponding positive bonding pad or negative bonding pad The line parallel to the x-axis.

[0038] Further, the lens is provided with a secondary temperature control thermistor at the surface edge, which is used to obtain the temperature at different positions and improve the reliability of temperature acquisition.

[0039] When the temperature control thermistor cannot work normally, the secondary temperature control thermistor is switched to continue monitoring the temperature change, and a closed loop temperature control is formed with the external control module.

[0040] Further, the ITO conductive film and the lens edge are plated with a SiO2 insulating protective film at the positions where the positive bonding pad and the negative bonding pad are not arranged; the temperature control thermistor and the secondary temperature control thermistor are located at the two intersection points of the edge of the SiO2 insulating protective film and the y-axis.

[0041] Further, the first heating sheet, the second heating sheet, the third heating sheet and the fourth heating sheet are ITO conductive films with the same thickness as the ITO conductive film, or are conductive films made of other metal materials such as constantan alloy, so that the equivalent resistance is the same as that of the first heating sheet, the second heating sheet, the third heating sheet and the fourth heating sheet made of the ITO conductive film.

[0042] Further, the first heating sheet, the second heating sheet, the third heating sheet and the fourth heating sheet are provided with a polyimide insulating film on the surface.

[0043] Further, the first heating sheet, the second heating sheet, the third heating sheet and the fourth heating sheet are attached to the outer surface of the light shield cover, and are used to assist the heat dissipation of the heat sink through the light shield cover.

[0044] The present application has the following beneficial effects compared with the prior art:

[0045] 1. The large-aperture transmission optical lens surface precision temperature control method provided by the present application adopts an external auxiliary resistance mode to increase different auxiliary resistances in the transverse direction of the ITO conductive film on the lens surface, so that the total transverse resistance at different positions is the same, the transverse current is uniform under the same voltage, the ITO conductive film can be uniformly heated, the uniformity of the lens surface temperature is ensured, and the problem of local hot spots in the ITO heating film during heating causing local thermal deformation of the lens glass is solved.

[0046] 2. The large-aperture transmission optical lens provided by the present application realizes uniform current distribution of the ITO conductive film by designing an auxiliary voltage regulating heater and connecting the ITO conductive film and the auxiliary voltage regulating heater through a plurality of wires.

[0047] 3. The large-aperture transmission optical lens provided by the present application sets the auxiliary voltage regulating heater in an arc-triangle shape, so that the four parts can be spliced into a rectangle with the ITO conductive film, and the same thickness ITO conductive film is selected for preparation, which facilitates the resistance value design of the auxiliary resistance.

[0048] 4. The large-aperture transmission optical lens provided by the present application adopts one main and one auxiliary two closed-loop temperature control thermistors to collect temperature measurement data, and performs closed-loop control on the voltage of the ITO conductive film and the auxiliary voltage regulating heater, so that the temperature error of the lens surface is controlled within ±0.1℃.

[0049] 5. The large-aperture transmission optical lens provided by the present application is provided with a SiO2 insulating protective film on the ITO conductive film and the lens edge, and a polyimide insulating film on the surface of the auxiliary voltage regulating heater, so as to ensure the stability of the insulation. BRIEF DESCRIPTION OF DRAWINGS

[0050] Figure 1is a structural schematic diagram of an embodiment of a large-aperture transmission optical lens of the present application;

[0051] Figure 2 is a structural schematic diagram of splicing of a heating sheet and an ITO conductive film in an embodiment of the present application;

[0052] Figure 3 is a temperature distribution diagram when a circular arc pad is used in an embodiment of the present application;

[0053] Figure 4 is a temperature distribution diagram when a uniformly distributed pad is used in an embodiment of the present application.

[0054] The following is a description of the reference numerals:

[0055] 1-lens assembly, 101-lens, 102-outer cylinder; 2-ITO conductive film, 201-positive pad, 202-negative pad; 3-assisted voltage regulating heater, 301-first heating sheet, 302-second heating sheet, 303-third heating sheet, 304-fourth heating sheet, 305-first lead pad, 306-second lead pad, 307-third lead pad, 308-fourth lead pad; 4-shading mask; 5-temperature control thermistor; 6-secondary temperature control thermistor;

[0056] A-x axis negative direction y axis positive direction region; B-x axis negative direction y axis negative direction region; C-x axis positive direction y axis positive direction region; D-x axis positive direction y axis negative direction region. DETAILED DESCRIPTION

[0057] The specific technical solutions in the embodiments of the present application will be further described below with reference to the accompanying drawings.

[0058] Figures 1-2 A large-aperture transmission optical lens provided in an embodiment of the present application includes a lens assembly 1, an ITO conductive film 2 arranged on one side of the lens assembly 1, an assisted voltage regulating heater 3 connected with the ITO conductive film 2, and a shading mask 4 mounted on the same side of the lens assembly 1 and the ITO conductive film 2.

[0059] The lens assembly 1 includes an outer cylinder 102, a lens 101 mounted in the outer cylinder 102, and an ITO conductive film 2 plated on one side surface of the lens 101 with a radius smaller than that of the lens 101; the shading mask 4 is mounted on one end of the outer cylinder 102.

[0060] Definition: A rectangular coordinate system is established with the center of the lens 101 as the origin, the horizontal axis is denoted as the x axis, and the vertical axis is denoted as the y axis.

[0061] The ITO conductive film 2 is divided into 26 conductive channels along the y-axis from positive to negative; the x-axis negative to y-axis positive region, the x-axis negative to y-axis negative region, the x-axis positive to y-axis positive region, and the x-axis positive to y-axis negative region are respectively denoted as A, B, C, and D;

[0062] The ITO conductive film 2 is uniformly plated with 26 copper pads (positive pad 201) on the 180° circumferential surface of the x-axis negative region along the y-axis at an interval of 10 mm, serving as the positive electrode of the electric heating; the ITO conductive film 2 is uniformly plated with 26 copper pads (negative pad 202) on the 180° circumferential surface of the x-axis positive region along the y-axis at an interval of 10 mm, serving as the negative electrode of the electric heating; the ITO conductive film 2 and the lens 101 are plated with a SiO2 protective film on a 3 mm exposed annular surface, avoiding the copper pads during plating; the copper pads are arranged at the intersection of the transverse center line of the 26 conductive channels and the outer periphery of the ITO conductive film 2;

[0063] The output ends of the auxiliary voltage regulating heater 3 are respectively connected to the positive pad 201 and the negative pad 202, for connecting an auxiliary resistance to the N conductive channels, so that the transverse channel resistance on each conductive channel is equal to the sum of the corresponding auxiliary resistance on the auxiliary voltage regulating heater 3, and the input end is connected to an external control module; the auxiliary voltage regulating heater 3 includes a first heating sheet 301, a second heating sheet 302, a third heating sheet 303, and a fourth heating sheet 304, corresponding to the A, B, C, and D parts of the ITO conductive film 2 respectively; the first heating sheet 301, the second heating sheet 302, the third heating sheet 303, and the fourth heating sheet 304 are right-angled triangle structures with arc edges, the right angle edges perpendicular to the x-axis serving as input ends, and the arc edges serving as output ends, and lead pads are arranged on the input ends and the output ends; the arc edges of the arc edge right-angled triangle structures are adapted to the ITO conductive film 2, so that the ITO conductive film 2 and the first heating sheet 301, the second heating sheet 302, the third heating sheet 303, and the fourth heating sheet 304 can be spliced into a square;

[0064] The lead pad includes:

[0065] The input ends of the first heating sheet 301 and the second heating sheet 302 are provided with 26 first lead pads 305 for external connection of positive voltage, and the output ends are provided with corresponding 26 second lead pads 306, corresponding to the N positive pads 201 of the A and B region ITO conductive film 2 one by one;

[0066] The input ends of the third heating sheet 303 and the fourth heating sheet 304 are provided with 26 third lead pads 307 for external connection of negative voltage, and the output ends are provided with corresponding 26 fourth lead pads 308, corresponding to the N negative pads 202 of the C and D region ITO conductive film 2 one by one;

[0067] In the spliced square, the first lead pad 305, the second lead pad 306, the third lead pad 307 and the fourth lead pad 308 are respectively connected with the wires of the corresponding positive pad 201 or negative pad 202, and the wires are parallel to the x-axis;

[0068] By applying a heating voltage to the two ends of the auxiliary voltage regulating heater 3, that is, to the input ends of the first heating sheet 301, the second heating sheet 302, the third heating sheet 303 and the fourth heating sheet 304, 26 conductive channels are turned on and start heating. Since the sum of the channel resistance and the auxiliary resistance is equal, the current on each conductive channel is equal.

[0069] In the embodiment of the present application, in order to avoid blocking the light path and ensure the reliability of temperature control, a main and a vice closed-loop temperature control thermistor are arranged on the SiO2 insulating protective film of the lens 101 in the positive and negative y-axis regions, that is, a temperature control thermistor 5 and a vice temperature control thermistor 6 are arranged at the two intersection points of the surface edge of the SiO2 insulating protective film and the y-axis, and the output ends of the temperature control thermistor 5 and the vice temperature control thermistor 6 are connected to a temperature control instrument (external control module) to collect and monitor the temperature change of the lens 101 during heating.

[0070] The temperature control instrument collects the temperature data of the thermistor, compares and analyzes the collected data with the required heating temperature, controls the applied heating voltage, and the temperature control thermistor 5 feeds back the temperature to the temperature control instrument. When the temperature of the temperature control thermistor 5 is higher than the set temperature, the heating voltage is reduced, and when the temperature of the temperature control thermistor 5 is lower than the set temperature, the heating voltage is increased, forming a closed-loop temperature control. The vice temperature control thermistor 6 is used for pure temperature measurement. When the temperature control thermistor 5 cannot work normally, the vice temperature control thermistor 6 is switched to form a closed-loop temperature control with the temperature control instrument. That is, the 24V voltage of the ITO conductive film 2 and the auxiliary voltage regulating heater 3 is controlled in a closed loop to control the temperature of the surface of the lens 101 to be 20±0.1℃.

[0071] In the embodiment of the present application, the auxiliary voltage regulating heater 3 is an ITO conductive film with the same thickness as the ITO conductive film 2, and the surface resistance is the same. The outer surface is provided with a polyimide film insulation, and the lead pads are consistent with the copper pads on the surface of the lens in the x-axis direction. The auxiliary voltage regulating heater 3 is attached to the outer surface of the light shield, and the light shield is used as an auxiliary heat sink for heat dissipation.

[0072] The embodiment of the present application adopts the idea of heating loop splicing, which can realize high temperature uniformity of the lens surface during heating,

[0073] As shown in the drawings, Figure 3 (A) is a pad distribution diagram, and (B) is a temperature distribution diagram. If a quarter circle arc-shaped positive pad is plated at C, and a quarter circle arc-shaped negative pad is plated at B, a local hot spot will be formed on the surface of the lens, and the maximum temperature difference on the surface is about 6℃.

[0074] As shown in Figure 4 (A) is a pad distribution diagram, (B) is a temperature distribution diagram, if A, B semicircle is plated with positive electrode pad, C, D side semicircle is plated with positive electrode pad, the lens surface has no obvious local hot spot, the maximum temperature difference of the surface is about 1.6 DEG C, and the maximum temperature difference of the use area of the optical system is about 0.3 DEG C without considering the edge pad area;

[0075] The lens surface precision temperature control method provided in the embodiment can obviously improve the phenomenon of excessive local temperature of the lens surface, effectively reduce thermal deformation, thereby avoiding optical system focal point drift, energy concentration test not up to standard, and astigmatism to affect observation performance.

[0076] The temperature control method of the optical lens provided in the embodiment is as follows:

[0077] S1, distinguish the conductive channel

[0078] A rectangular coordinate system is established with the center of the lens surface as the origin, the horizontal axis is denoted as the x axis, and the vertical axis is denoted as the y axis;

[0079] The ITO conductive film of the lens surface is divided into 26 conductive channels from positive to negative along the y axis, and the center line of the conductive channel is parallel to the x axis; the channel resistance of each conductive channel is Ri, i is the label of the conductive channel at different positions, and the value range of i is 1-26;

[0080] S2, external auxiliary resistance

[0081] For conductive channels at different positions, different auxiliary resistances Rai are connected, so that the sum of the channel resistance and the corresponding auxiliary resistance of each conductive channel Ri+Rai satisfies: R1+Ra1=R2+Ra2=……=R26+Ra26;

[0082] S3, external heating voltage

[0083] The same heating voltage is applied to each conductive channel and the corresponding auxiliary resistance, so that the transverse current on each conductive channel is uniform;

[0084] S4, collect temperature data

[0085] The temperature during heating is collected through two thermistors arranged at the y axis of the lens surface;

[0086] S5, closed loop precision temperature control

[0087] The collected temperature data is judged and processed, if the temperature of the lens surface meets the heating requirement, the applied heating voltage is maintained unchanged, and the heating is continued;

[0088] If the temperature of the lens surface does not meet the heating requirement, the heating voltage applied to each conductive channel and the corresponding auxiliary resistance is adjusted, when the collected temperature is higher than the required heating temperature, the heating voltage is reduced, when the collected temperature is lower than the required heating temperature, the heating voltage is increased, forming a closed loop temperature control; after the adjustment is completed, return to step S3, form a closed loop temperature control, realize precise temperature control of the lens surface.

[0089] The above is only one embodiment of the present application, and is not a limitation on the scope of protection of the present application. Any equivalent structural transformation using the content of the specification and drawings, or direct or indirect application in other related technical fields, is included in the patent protection scope of the present application.

Claims

1. A large aperture transmissive optical lens surface precision temperature control method, characterized in that, Comprising the following steps: S1, distinguish conductive channels A rectangular coordinate system is established with the center of the lens surface as the origin, the horizontal axis is denoted as the x-axis, and the vertical axis is denoted as the y-axis; Along the y-axis, the ITO conductive film on the lens surface is divided into N conductive channels from positive to negative, so that the width of each conductive channel is 4-16 mm, and the center line of the conductive channel is parallel to the x-axis; The channel resistance of each conductive channel is Ri, i is the label of the conductive channel at different positions, and i is in the range of 1-N; S2, external auxiliary resistance For conductive channels at different positions, different auxiliary resistances Rai are connected, so that the sum of the channel resistance and the corresponding auxiliary resistance of each conductive channel Ri+Rai satisfies: R1+Ra1=R2+Ra2=……=RN+RaN; S3, external heating voltage The same heating voltage is applied to each conductive channel and the corresponding auxiliary resistance, so that the transverse current on each conductive channel is uniform; S4, collect temperature data Thermistors are arranged at the edges of the lens surface to collect the temperature during heating; S5, closed-loop precise temperature control The collected temperature data is processed, if the temperature of the lens surface meets the heating requirement, the applied heating voltage is maintained unchanged, and the heating continues; If the temperature of the lens surface does not meet the heating requirement, the heating voltage applied to each conductive channel and the corresponding auxiliary resistance is adjusted, and step S3 is returned to realize precise temperature control of the lens surface.

2. The method according to claim 1, wherein in S2, the maximum value of the sum of the channel resistance and the corresponding auxiliary resistance of the N conductive channels Ri+Rai is Rm, so that Ri+Rai satisfies: R1+Ra1=R2+Ra2=……=RN+RaN=Rm; and the maximum value Rm is the maximum value of the N different channel resistances Ri.

3. A large-aperture transmission optical lens, which adopts the method according to claim 1, comprising: a lens assembly (1), an ITO conductive film (2) arranged on one side of the lens assembly (1), an auxiliary voltage regulating heater (3) connected with the ITO conductive film (2), and a light shield (4) mounted on the same side of the lens assembly (1) and the ITO conductive film (2); The lens assembly (1) comprises an outer cylinder (102) and a lens (101) mounted in the outer cylinder (102), the ITO conductive film (2) is plated on one side surface of the lens (101) with a radius smaller than that of the lens (101); and the light shield (4) is mounted on one end of the outer cylinder (102); A rectangular coordinate system is established with the center of the lens (101) as the origin, the horizontal axis is denoted as the x-axis, and the vertical axis is denoted as the y-axis; The ITO conductive film (2) is divided into N conductive channels along the y-axis from positive to negative, so that the width of each conductive channel is 4-16 mm, and the center line of the conductive channel is parallel to the x-axis; ​ ​ The center line of the N conductive channels is provided with 2N pads at the intersection with the outer periphery of the ITO conductive film (2), including N positive electrode pads (201) in the negative region of the x-axis, and N negative electrode pads (202) in the positive region of the x-axis; The output end of the auxiliary voltage regulating heater (3) is connected with the N positive electrode pads (201) and the N negative electrode pads (202), respectively, for connecting auxiliary resistors to the N conductive channels, so that the transverse channel resistance on each conductive channel is equal to the sum of the corresponding auxiliary resistance on the auxiliary voltage regulating heater (3), and the input end of the auxiliary voltage regulating heater (3) is connected with an external control module for applying heating voltage to the corresponding positive electrode pads (201) and negative electrode pads (202) of each conductive channel; The lens (101) is provided with a temperature control thermistor (5) at the surface edge for collecting and monitoring the temperature change of the lens (101) during heating, and the output end of the temperature control thermistor (5) is connected with an external control module for controlling the heating voltage according to the collected temperature change to realize temperature control of the lens surface.

4. The large-aperture transmission optical lens according to claim 3, characterized in that: Definitions: the x-axis negative y-axis positive region, the x-axis negative y-axis negative region, the x-axis positive y-axis positive region and the x-axis positive y-axis negative region of the lens (101) surface are A, B, C and D, respectively; The auxiliary voltage regulating heater (3) includes a first heating sheet (301), a second heating sheet (302), a third heating sheet (303) and a fourth heating sheet (304), which correspond to the parts of the ITO conductive film (2) located on the surfaces A, B, C and D of the lens (101), respectively; The input end of the first heating sheet (301) and the second heating sheet (302) is provided with N first lead pads (305) for connecting positive voltage, and the output end is provided with corresponding N second lead pads (306) corresponding to the N positive electrode pads (201) of the ITO conductive film (2) in the A and B regions; The input end of the third heating sheet (303) and the fourth heating sheet (304) is provided with N third lead pads (307) for connecting negative voltage, and the output end is provided with corresponding N fourth lead pads (308) corresponding to the N negative electrode pads (202) of the ITO conductive film (2) in the C and D regions.

5. The large-aperture transmission optical lens according to claim 4, characterized in that: The width of each conductive channel is equal; The first heating sheet (301), the second heating sheet (302), the third heating sheet (303) and the fourth heating sheet (304) are arc straight angle triangle structures, the straight angle side perpendicular to the x-axis as the input end, and the arc side as the output end; The arc edge of the arc edge triangle structure is matched with the outer peripheral edge of the ITO conductive film (2), so that the ITO conductive film (2) can be spliced into a rectangle with the first heating sheet (301), the second heating sheet (302), the third heating sheet (303), and the fourth heating sheet (304), and in the rectangle, the first lead bonding pad (305), the second lead bonding pad (306), the third lead bonding pad (307), and the fourth lead bonding pad (308) are respectively parallel to the x-axis with the connecting lines of the corresponding positive bonding pad (201) or negative bonding pad (202).

6. The large-aperture transmission optical lens according to claim 5, characterized in that: The lens (101) is provided with a secondary temperature control thermistor (6) at the surface edge.

7. The large-aperture transmission optical lens according to claim 6, characterized in that: The ITO conductive film (2) and the lens (101) edge are not provided with positive bonding pad (201) and negative bonding pad (202) plated with SiO2 insulating protective film; The temperature control thermistor (5) and the secondary temperature control thermistor (6) are located at the two intersection points of the SiO2 insulating protective film edge and the y-axis.

8. The large-aperture transmission optical lens according to claim 7, characterized in that: The first heating sheet (301), the second heating sheet (302), the third heating sheet (303), and the fourth heating sheet (304) are ITO conductive films with the same thickness as the ITO conductive film (2), or are made of constantan alloy to make the first heating sheet (301), the second heating sheet (302), the third heating sheet (303), and the fourth heating sheet (304) have the same resistance as the ITO conductive film.

9. The large-aperture transmission optical lens according to claim 8, characterized in that: The first heating sheet (301), the second heating sheet (302), the third heating sheet (303), and the fourth heating sheet (304) are provided with a polyimide insulating film on the surface.

10. The large-aperture transmission optical lens according to claim 9, characterized in that: The first heating sheet (301), the second heating sheet (302), the third heating sheet (303), and the fourth heating sheet (304) are attached to the outer surface of the light shield cover (4) to assist heat dissipation with the light shield cover (4).

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