A method and apparatus for light solidification additive manufacturing based on double telecentric lenses

Abstract

The present application relates to the field of light-cured additive manufacturing, and more particularly to a light-cured additive manufacturing method and device based on a double-telecentric lens, comprising the following steps: S1: completing optical design of a double-telecentric system front lens group I, a double-telecentric system front lens group II and a double-telecentric system rear lens group based on double-telecentric system optical indicators; S2: a projection light beam emitted by a DLP optical module passes through the double-telecentric system front lens group I and a light splitting prism in sequence and is incident into the double-telecentric system rear lens group, and is projected to a photosensitive resin pool through the double-telecentric system rear lens group, so that the photosensitive resin in the photosensitive resin pool is cured and formed on a displacement table, and the displacement table moves along a vertical Z-axis to layer-by-layer build a three-dimensional micro-nano structure; the method further comprises the following step: S3: a light-cured forming pattern is projected to an industrial camera through a feedback light path; the method can effectively solve the shortcomings of low forming precision, poor forming quality and slow forming speed in existing light-cured technology.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of light-cured additive manufacturing, and more particularly to a light-cured additive manufacturing method and device based on a double-telecentric lens. BACKGROUND

[0002] Projection light-cured technology uses dynamic mask principle based on DLP optical module to cure photosensitive resin layer by layer through patterned light, and is widely used in high-resolution structure manufacturing. However, due to the inherent Gaussian distribution characteristics of the projection light spot, the light intensity in the center region is much higher than that in the edge, and there is light scattering effect and heat accumulation in the curing process of photosensitive resin, which leads to decreased forming precision, poor surface quality and slow forming rate. The existing technology improvement strategies mainly focus on optimizing exposure parameters, improving photosensitive resin formula and introducing galvanometer scanning system. However, there is a lack of in-depth optimization analysis of low-cost optical path design and its influence mechanism on the light-cured process, which makes it difficult to simultaneously realize high-precision forming and high-speed manufacturing on the sub-micron scale. Therefore, it is urgent to develop an optical path optimization system that can perform imaging quality on the transmission path of the projection light beam, so as to realize high-precision and rapid forming of photosensitive resin. SUMMARY

[0003] The purpose of the present application is to provide a light-cured additive manufacturing method and device based on a double-telecentric lens, which can effectively solve the problems of low forming precision, poor forming quality and slow forming speed in existing light-cured technology.

[0004] The purpose of the present application is achieved by the following technical solutions:

[0005] A light-cured additive manufacturing method based on a double-telecentric lens, the method comprising the following steps:

[0006] Step S1: completing optical design of a double-telecentric system front lens group I, a double-telecentric system front lens group II and a double-telecentric system rear lens group based on double-telecentric system optical indicators;

[0007] Step S2: the projection light beam emitted by the DLP optical module passes through the double-telecentric system front lens group I and the light splitting prism in sequence and is incident into the double-telecentric system rear lens group, and is patterned projected to the photosensitive resin pool through the double-telecentric system rear lens group, so that the photosensitive resin in the photosensitive resin pool is cured and formed on the forming base, and the forming base moves along the vertical Z axis to build three-dimensional micro-nano structures layer by layer;

[0008] The method further comprises step S3: projecting the light-cured forming pattern to an industrial camera through a feedback optical path;

[0009] In the step S1, based on the hardware characteristics of the DLP optical module, the double-telecentric system optical indexes include a working waveband, a field angle, a numerical aperture, an F number, a telecentricity and a modulation transfer function (MTF), the double-telecentric system optical initial structure is constructed according to the optical index constraints, and the spherical aberration, distortion and field curvature are iteratively optimized and compensated and corrected by using the geometric optical aberration theory;

[0010] The photosensitive resin is a composite photocuring system of an acrylate monomer and an epoxy curing crosslinking agent, and the concentration of the photoinitiator is 0.1-2wt%.

[0011] In the step S3, the feedback light path is illuminated by the LED light source in a coaxial condensing manner.

[0012] The feedback light path is a light beam irradiated by the LED light source, is projected onto the forming base in the photosensitive resin through the double-telecentric system front lens group II, the light splitting prism and the double-telecentric system rear lens group, and according to the light path reversibility principle, the photocured forming pattern on the forming base is projected onto the industrial camera through the double-telecentric system rear lens group, the light splitting prism and the double-telecentric system front lens group II.

[0013] The positions of the DLP optical module, the double-telecentric system front lens group I, the double-telecentric system rear lens group, the light splitting prism and the double-telecentric system front lens group II are adjusted in real time through the feedback of the industrial camera.

[0014] The industrial camera adopts a photoelectric conversion CMOS area sensor and is vertically integrated through a photosensitive layer, a logic operation layer and a data buffer layer, a plurality of rows of images are collected each time and image information is output at a super high frame rate, so that the dynamic monitoring feedback curing morphology information is realized.

[0015] A photocuring additive manufacturing device based on a double-telecentric lens, comprising a DLP optical module, the DLP optical module is installed on a shear type lifting platform, the shear type lifting platform is installed on an optical face breadboard, a projection light beam output by the DLP optical module sequentially passes through a double-telecentric system front lens group I, a light splitting prism and a double-telecentric system rear lens group, and is finally irradiated on a photosensitive resin pool, the photosensitive resin pool is provided with photosensitive resin and a forming base, the photosensitive resin pool is fixed and supported by a dovetail type lifting platform installed on the optical face breadboard, the forming base is installed on a vertical displacement end of a displacement platform, the displacement platform is installed on the optical face breadboard through a displacement platform mounting frame, an optical connecting rod support is installed on the optical face breadboard, an optical coaxial mounting plate is installed on the optical connecting rod support, the double-telecentric system front lens group I, the light splitting prism and the double-telecentric system rear lens group are all installed on the optical coaxial mounting plate.

[0016] The optical coaxial mounting plate is installed with an optical orthogonal adapter, the optical orthogonal adapter is installed with an LED light source, a double-telecentric system front lens group II and an industrial camera.

[0017] The photocuring additive manufacturing device based on the double-telecentric lens has the advantages that:

[0018] By high resolution, near zero aberration, compact double telecentric system front group I and double telecentric system rear group design optimization combined with industrial camera real-time feedback forming pattern, high precision, low cost sub-micron structure can be effectively realized;

[0019] Double telecentric system front group I and double telecentric system rear group cooperate to replace traditional multiple correction lenses, which greatly reduces the cost of optical components, improves image contrast, suppresses the influence of stray light on the light path, and at the same time can ensure that the projection light path and feedback light path meet the comprehensive requirements of high resolution, low distortion and processing realization. Ultimately, sub-micron structures with line width less than 1 μm can be manufactured, which fundamentally solves the problem that the resolution of traditional low-cost surface projection photopolymerization additive manufacturing cannot reach the precision of sub-micron size;

[0020] The feedback light path is based on the real-time focusing regulation of the monitored solidification pattern, which realizes uniform exposure and high resolution molding in the full width range. This method has good adaptability to different photosensitive resin systems under the premise of ensuring sub-micron high precision molding, and provides strong technical support for high precision micro-nano additive manufacturing. BRIEF DESCRIPTION OF DRAWINGS

[0021] The application will be further described in detail below in combination with the drawings and specific implementation methods.

[0022] Figure 1 is a double telecentric lens photopolymerization additive manufacturing device structure schematic diagram of the application;

[0023] Figure 2 is a double telecentric system front group I structure schematic diagram of the application;

[0024] Figure 3 is a double telecentric system front group II structure schematic diagram of the application;

[0025] Figure 4 is a double telecentric system rear group structure schematic diagram of the application;

[0026] Figure 5 is a double telecentric system projection molding area schematic diagram of the application;

[0027] Figure 6 is a double telecentric system optical imaging structure schematic diagram of the application;

[0028] Figure 7 is a double telecentric system optical imaging standard point column diagram of the application;

[0029] Figure 8 is a double telecentric system optical imaging standard distortion diagram of the application;

[0030] Figure 9is a double telecentric system optical imaging modulation transfer function (MTF) curve diagram of the application;

[0031] Figure 10 is a double telecentric system optical imaging minimum resolution curve diagram of the application;

[0032] Figure 11 is a double telecentric system lens data of the application;

[0033] Figure 12 is a high-precision manufacturing sample schematic diagram of the double telecentric lens-based photocuring additive manufacturing method and device of the application.

[0034] In the figure: DLP optical module 11; double telecentric system front lens group I 12; double telecentric system rear lens group 13; light splitting prism 14; LED light source 15; feedback light path 16; double telecentric system front lens group II 17; micro-nano structure 21; photosensitive resin pool 22; photosensitive resin 23; forming base 24; displacement table 31; displacement table mounting bracket 32; industrial camera 41; scissor lift table 51; optical connecting rod 52; optical connecting rod support 53; optical coaxial mounting plate 54; dovetail lift table 55; optical breadboard 56; optical orthogonal adapter 57. DETAILED DESCRIPTION

[0035] The application will be further described in detail below in combination with the drawings.

[0036] As Figures 1 to 12 shown, in order to achieve the beneficial effect of "fundamentally solving the problem that the resolution of traditional low-cost face projection photocuring additive manufacturing cannot reach sub-micron precision", the steps and functions of a double telecentric lens-based photocuring additive manufacturing method are described in detail below.

[0037] A double telecentric lens-based photocuring additive manufacturing method, the method comprising the following steps:

[0038] Step S1: completing optical design of double telecentric system front lens group I 12, double telecentric system front lens group II 17 and double telecentric system rear lens group 13 based on double telecentric system optical indicators;

[0039] Based on the hardware characteristics of the DLP optical module 11, the double telecentric system optical indicators include working waveband, field of view, numerical aperture, F number, telecentricity and modulation transfer function (MTF). According to the optical indicator constraints, the double telecentric system optical initial structure is constructed, and the key aberrations of spherical aberration, distortion and field curvature are iteratively optimized and compensated and corrected by using geometric optical aberration theory.

[0040] Synchronous integrated athermal design strategy, to ensure the imaging performance in the temperature range of 20-40℃ fluctuation ≤1%, further combined with the processing and assembly error for Monte Carlo simulation and sensitivity analysis, quantitative evaluation of system manufacturing yield (>95%), the final completion of optical element integration and MTF measurement verification, the completion of the double telecentric system front group I 12, double telecentric system front group II 17 and double telecentric system rear group 13 optical design;

[0041] The double telecentric system front group I 12, double telecentric system front group II 17 and double telecentric system rear group 13 optical indicators are shown in the following table:

[0042]

[0043] The double telecentric system front group I 12, double telecentric system front group II 17 and double telecentric system rear group 13 optical initial structure is that the double telecentric system front group I 12 and double telecentric system front group II 17 are composed of 4 spherical mirrors, and the double telecentric system rear group 13 is composed of 2 groups of double cemented lenses and 5 spherical mirrors, forming a double telecentric system rear group 13 with a diaphragm in the middle of the optical path, the double telecentric system rear group 13 combines the characteristics of the symmetric structure of the double Gauss objective lens, and can correct spherical aberration and other imaging aberrations by combining positive and negative lenses;

[0044] The final lens parameters of the double telecentric system front group I 12, double telecentric system front group II 17 and double telecentric system rear group 13 are as follows:

[0045]

[0046]

[0047] Step S2: The projection light beam emitted by the DLP optical module 11 passes through the double telecentric system front group I 12 and the light splitting prism 14 in turn and is incident into the double telecentric system rear group 13, and is patterned projected to the photosensitive resin pool 22 through the double telecentric system rear group 13, so that the photosensitive resin 23 in the photosensitive resin pool 22 is cured and formed on the forming substrate 24, and the forming substrate 24 moves along the vertical Z axis to build the three-dimensional micro-nano structure 21 layer by layer;

[0048] The patterned projection light beam 16 emitted by the DLP optical module 11 passes through the double-telecentric system front lens group I 12 and the light splitting prism 14 in turn and is incident into the double-telecentric system rear lens group 13, and is focused by the double-telecentric system rear lens group 13 and projected on the photosensitive resin 23. The photosensitive resin 23 is a composite photocuring system of acrylate monomer and epoxy curing crosslinking agent, and the concentration of the photoinitiator is 0.1-2wt%. The photoinitiator molecules are excited to the excited state to generate free radicals under the excitation of 405nm near-ultraviolet light, the free radicals react with the acrylate monomer to form chain polymerization, thereby forming sub-micron size structures. The displacement table 31 continuously moves the forming substrate 24 along the vertical Z-axis direction at a preset layer thickness Δz, and the complex three-dimensional micro-nano structure 21 is manufactured layer by layer;

[0049] Step S3: The photocuring forming pattern is projected to the industrial camera 41 through the feedback light path 16; the feedback light path 16 is illuminated by the LED light source 15 in a coaxial light condensing manner; the feedback light path 16 is the light beam emitted by the LED light source 15, which passes through the double-telecentric system front lens group II 17, the light splitting prism 14 and the double-telecentric system rear lens group 13 and is projected onto the forming substrate 24 in the photosensitive resin 23. According to the light path reversibility principle, the photocuring forming pattern on the forming substrate 24 is projected to the industrial camera 41 through the double-telecentric system rear lens group 13, the light splitting prism 14 and the double-telecentric system front lens group II 17;

[0050] And relying on the variance method for the clarity of the forming pattern, the position of the industrial camera 41 is adjusted to accurately focus on the forming substrate 24; the forming pattern information real-time regulates the light intensity density of the DLP optical module 11, so as to adapt to the high-precision forming system, reduce the light beam diffusion, and obtain high-resolution sub-micron micro-nano structure 21;

[0051] The variance method evaluates the pattern clarity through a three-stage process: first, image preprocessing is performed to convert the pattern into a grayscale image to retain brightness information and unify all pattern sizes to eliminate resolution differences; then, the statistical variance of all pixel gray values of the entire pattern is calculated, that is, the sum of the square deviations of each pixel value from the average brightness divided by the total number of pixels. This variance value directly serves as the clarity quantification index. Finally, based on the core principle that high variance corresponds to high clarity, that is, clear patterns have rich details leading to dramatic changes in pixel values, and blurred patterns have low variance characteristics due to smooth transitions, objective sorting is achieved by comparing the variance scores of multiple patterns. The greater the variance value, the higher the clarity.

[0052] The DLP optical module 11 uses a low-cost 405nm near-ultraviolet LED as the light source, with an output power of up to 850mW. The micromirror array size is 0.47 inches (11.93mm diagonal), the resolution is 1920x1080, and the chip size is 10.368mmx5.832mm with a distortion of <0.1%;

[0053] The positions of the DLP optical module 11, the double-telecentric system front lens group I 12, the double-telecentric system rear lens group 13, the light splitting prism 14 and the double-telecentric system front lens group II 17 are adjusted in real time through the feedback of the industrial camera 41; the industrial camera 41 is adjusted in real time based on the monitored curing pattern, and uniform exposure and high-resolution forming in the full-width range are realized, which has good adaptability to different photosensitive resin systems under the premise of ensuring sub-micron high-precision forming, and provides strong technical support for high-precision micro-nano additive manufacturing;

[0054] The feedback unit is provided on the industrial camera 41, and the feedback unit is selected by using spectral imaging technology, and the resolution can reach 1 μm, and the real-time feedback frequency is ≥60 Hz;

[0055] The industrial camera 41 adopts a photoelectric conversion CMOS area sensor, which is vertically integrated through a photosensitive layer, a logic operation layer and a data buffer layer, a plurality of rows of images are collected each time, and image information is output at a super-high frame rate, so that dynamic monitoring and feedback of the curing form information are realized;

[0056] As shown in Figures 1 to 5 ;

[0057] A light-curing additive manufacturing device based on a double-telecentric lens, comprising a DLP optical module 11, the DLP optical module 11 is installed on a shear lifting platform 51, the shear lifting platform 51 is installed on an optical face breadboard 56, a projection light beam output by the DLP optical module 11 passes through a double-telecentric system front lens group I 12, a light splitting prism 14 and a double-telecentric system rear lens group 13 in sequence, and finally irradiates on a photosensitive resin pool 22, the photosensitive resin pool 22 is provided with photosensitive resin 23 and a forming substrate 24, the photosensitive resin pool 22 is fixed and supported by a dovetail lifting platform 55 installed on the optical face breadboard 56, the forming substrate 24 is installed on a vertical displacement end of a displacement table 31, the displacement table 31 is installed on the optical face breadboard 56 through a displacement table mounting frame 32, an optical connecting rod support 53 is installed on the optical face breadboard 56, an optical coaxial mounting plate 54 is installed on the optical connecting rod support 53, and the double-telecentric system front lens group I 12, the light splitting prism 14 and the double-telecentric system rear lens group 13 are all installed on the optical coaxial mounting plate 54;

[0058] The optical coaxial mounting plate 54 is installed with an optical orthogonal adapter 57, the optical orthogonal adapter 57 is installed with an LED light source 15, a double-telecentric system front lens group II 17 and an industrial camera 41;

[0059] In use, the height of the DLP optical module 11 is adjusted through the shear lifting platform 51, so that the projection light beam emitted by the DLP optical module 11 can enter the double-telecentric system front lens group I 12;

[0060] The displacement stage 31 can slide on the displacement stage mounting frame 32 under the drive of an external power source, such as a hydraulic cylinder or an electric push rod, so that the displacement stage 31 can drive the molding substrate 24 to move continuously along the vertical Z-axis with a preset layer thickness Δz.

[0061] The dovetail-shaped lifting platform 55 can drive the photosensitive resin tank 22 to move, thereby adjusting the height of the photosensitive resin tank 22.

[0062] The positions of the DLP optical module 11, the front lens group I 12 of the dual telecentric system, the rear lens group 13 of the dual telecentric system, the beam splitter prism 14, and the front lens group II 17 of the dual telecentric system are adjusted in real time based on feedback from the industrial camera 41; for example... Figure 1 As shown, the optical extension rod bracket 53 can be configured as a hydraulic cylinder or an electric push rod. The optical extension rod bracket 53 can push the optical coaxial mounting plate 54 to move up and down. The optical coaxial mounting plate 54 drives the optical orthogonal adapter 57 to move up and down, thereby adjusting the height of the front lens group I 12 of the dual telecentric system, the rear lens group 13 of the dual telecentric system, the beam splitter prism 14 and the front lens group II 17 of the dual telecentric system. The height of the DLP optical module 11 is adjusted by the scissor lift platform 51.

[0063] When using, such as Figure 1 As shown, the patterned projection beam emitted by the DLP optical module 11 passes sequentially through the front mirror group I 12 and the beam splitter prism 14 of the dual telecentric system and enters the rear mirror group 13 of the dual telecentric system. After being focused and projected onto the photosensitive resin 23 by the rear mirror group 13 of the dual telecentric system, the photosensitive resin 23 is a composite photocuring system of acrylate monomer and epoxy curing crosslinking agent. The concentration of photoinitiator is 0.1-2wt%. The photoinitiator molecules jump to the excited state under the excitation of near-ultraviolet light with a wavelength of 405nm to generate free radicals. The free radicals react with the acrylate monomer to form chain polymerization, thereby forming a submicron-sized structure. The displacement stage 31 drives the forming substrate 24 to move continuously along the vertical Z-axis with a preset layer thickness Δz, and fabricates a complex three-dimensional micro-nano structure 21 layer by layer.

[0064] like Figures 2 to 4 The diagram shows the structures of the front lens group I 12, the front lens group II 17, and the rear lens group 13 of the dual telecentric system. Based on performance constraints, the initial optical structure was selected, and geometrical optical aberration theory was used to iteratively optimize and compensate for key aberrations such as spherical aberration, distortion, and field curvature. A synchronously integrated calorimetric design strategy ensured that the imaging performance fluctuated by ≤1% within the operating temperature range of 20℃ to 40℃. Furthermore, Monte Carlo simulation and sensitivity analysis were conducted in conjunction with processing and assembly errors to quantitatively evaluate the system's manufacturing yield (>95%). Finally, the integration and MTF (Mean Transformation Factor) verification of the front lens group I 12, the front lens group II 17, and the rear lens group 13 of the dual telecentric system were completed.

[0065] likeFigure 5 As shown, the cross-section forming and the process in the cross-section diagram are embodied in the present application: first, the patterned projection light beam is focused by the double telecentric system front lens group 112 and the double telecentric system rear lens group 13, corresponding to the required cross-section profile; in this process, the photosensitive resin 23 is converted from liquid to solid, generating the micro-nano structure 21 on the forming substrate 24. In this cross-section structure, the photosensitive resin pool 22, the forming substrate 24 and the forming structure 21 cooperate with each other to ensure that the platform driven by the displacement table 31 is positioned along the Z axis Δz after each forming, providing stable support for the next layer forming, and finally forming the required complex three-dimensional micro-nano structure 21;

[0066] As shown in the figure, it is a schematic diagram of the double telecentric system optical imaging structure, which corresponds to the DLP optical module 11, the double telecentric system front lens group 112 / the double telecentric system front lens group 117 and the double telecentric system rear lens group 13 in turn; Figure 6

[0067] As shown in the figure, it is a standard point column diagram of the double telecentric system optical imaging, the maximum RMS radius is 0.264 μm, and the RMS radius of each field point is smaller than the Airy disk radius, indicating that the imaging quality is excellent; Figure 7

[0068] As shown in the figure, it is a standard distortion diagram of the double telecentric system optical imaging of the present application, the maximum distortion of the system is only 0.0075%, the control of geometric distortion is good, and the linearity precision of the projection size can be ensured; Figure 8

[0069] As shown in the figure, it is a modulation transfer function MTF curve diagram of the double telecentric system optical imaging of the present application, the meridian and sagittal MTF curves of all fields are greater than 0.5 at a spatial frequency of 1000 lp / mm, and close to the diffraction limit, and the optical system can achieve a theoretical resolution of 0.5 μm; Figure 9

[0070] As shown in the figure, it is a minimum resolution curve diagram of the double telecentric system optical imaging of the present application, when two adjacent pixel points are apart by 0.53 μm, the lowest light intensity accounts for 66% of the peak light intensity and can be resolved, and the system can realize a spatial resolution of 0.5 μm under the current parameter configuration; Figure 10

[0071] As shown in the figure, it is the lens data of the double telecentric system of the present application, the double telecentric system front lens group 112 / the double telecentric system front lens group 117 includes four lenses, and the double telecentric system rear lens group 13 includes seven lenses, of which two are double-cemented lenses; Figure 11

[0072] As shown in the figure, it is the lens data of the double telecentric system of the present application, the double telecentric system front lens group 112 / the double telecentric system front lens group 117 includes four lenses, and the double telecentric system rear lens group 13 includes seven lenses, of which two are double-cemented lenses; Figure 12 ​​​​​​The high-precision manufacturing samples shown are manufactured by the dual-telecentric lens-based photocuring additive manufacturing device of the application, containing line grid structure, square structure, circular structure and grid structure, and the minimum grid feature size reaches 0.47 μm.

Claims

1. A photopolymerization additive manufacturing method based on dual telecentric lenses, characterized in that: The method includes the following steps: Step S1: Based on the optical parameters of the dual telecentric system, complete the optical design of the front lens group I (12), the front lens group II (17), and the rear lens group (13) of the dual telecentric system; Step S2: The projection beam emitted by the DLP optical module (11) passes through the front mirror group I (12) and the beam splitter (14) of the dual telecentric system and enters the rear mirror group (13) of the dual telecentric system. The beam is then patterned and projected onto the photosensitive resin pool (22) through the rear mirror group (13), so that the photosensitive resin (23) in the photosensitive resin pool (22) is solidified on the molding substrate (24). The molding substrate (24) moves along the vertical Z-axis to build a three-dimensional micro-nano structure (21) layer by layer. Step S3: The photocured pattern is projected onto the industrial camera (41) through the feedback light path (16); the feedback light path (16) is illuminated by the LED light source (15) in a coaxial focusing manner; the feedback light path (16) is the light beam emitted by the LED light source (15), which is projected onto the molding substrate (24) in the photosensitive resin (23) through the front lens group II (17) of the dual telecentric system, the beam splitter (14) and the rear lens group II (13) of the dual telecentric system. According to the principle of reversible light path, the photocured pattern on the molding substrate (24) is projected onto the industrial camera (41) through the rear lens group II (13) of the dual telecentric system, the beam splitter (14) and the front lens group II (17) of the dual telecentric system.

2. The photopolymerization additive manufacturing method based on a double telecentric lens according to claim 1, characterized in that: In step S1, based on the hardware characteristics of the DLP optical module (11), the optical indicators of the dual telecentric system include the working band, field of view, numerical aperture, F number, telecentricity and modulation transfer function (MTF). The initial optical structure of the dual telecentric system is constructed according to the constraints of the optical indicators. The geometric optical aberration theory is used to iteratively optimize and compensate for spherical aberration, distortion and field curvature, and key aberrations.

3. The photopolymerization additive manufacturing method based on a double telecentric lens according to claim 1, characterized in that: The photosensitive resin (23) is a composite photocurable system of acrylate monomer and epoxy curing crosslinking agent, with a photoinitiator concentration of 0.1 to 2 wt%.

4. The photopolymerization additive manufacturing method based on a double telecentric lens according to claim 1, characterized in that: The positions of the DLP optical module (11), the front lens group I (12) of the dual telecentric system, the rear lens group (13) of the dual telecentric system, the beam splitter (14) and the front lens group II (17) of the dual telecentric system are adjusted in real time based on feedback from the industrial camera (41).

5. The photopolymerization additive manufacturing method based on a double telecentric lens according to claim 1, characterized in that: The industrial camera (41) adopts a photoelectric conversion CMOS area array sensor, which is vertically integrated through a photosensitive layer, a logic operation layer and a data buffer layer. It acquires several lines of images each time and outputs image information at an ultra-high frame rate, thereby realizing dynamic monitoring and feedback of solidified morphological information.

6. A photopolymerization additive manufacturing apparatus based on dual telecentric lenses, comprising a DLP optical module (11), characterized in that: The DLP optical module (11) is mounted on a scissor lift platform (51), which is mounted on an optical breadboard (56). The DLP optical module (11) outputs a projection beam that passes sequentially through the front mirror group I (12) of the dual telecentric system, the beam splitter (14), and the rear mirror group (13) of the dual telecentric system, and finally illuminates the photosensitive resin pool (22). The photosensitive resin pool (22) contains photosensitive resin (23) and a molding substrate (24). The photosensitive resin pool (22) is mounted on the optical breadboard (56). The dovetail-shaped lifting platform (55) is fixedly supported, the molding base (24) is installed on the vertical displacement end of the displacement platform (31), the displacement platform (31) is installed on the optical breadboard (56) through the displacement platform mounting bracket (32), the optical breadboard (56) is equipped with an optical extension rod bracket (53), the optical extension rod bracket (53) is equipped with an optical coaxial mounting plate (54), the front lens group I (12) of the dual telecentric system, the beam splitter prism (14) and the rear lens group (13) of the dual telecentric system are all installed on the optical coaxial mounting plate (54); The optical coaxial mounting plate (54) is equipped with an optical orthogonal adapter (57), on which are mounted an LED light source (15), a dual telecentric system front lens group II (17), and an industrial camera (41).

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