Printing optical element, printing method and far image optical instrument

Abstract

The invention provides a printing optical element, a printing method and a far-image optical instrument, and relates to the technical field of far-image optics, the printing optical element comprises a substrate and a patterning layer, the substrate is transparent, and a printing area is arranged on the first side of the substrate; the patterned layer is located in the printing area and comprises a plurality of function parts protruding from the surface of the substrate, and the function parts are formed through UV printing and distributed in a geometric array mode. Wherein the function part is semitransparent and is in a continuous columnar form; the functional part is reflected by the free-form surface mirror to be imaged to an imaging panel of the far-image optical instrument and presents a first imaging surface; and the first imaging surface and a second imaging surface of the far-image optical instrument for amplifying and presenting the object are distributed at an interval. When a user watches magnified information on the second imaging surface, the focal length can be actively adjusted to switch focusing between the first imaging surface and the second imaging surface, so that eyestrain is relieved, and the effect of adjusting crystalline lenses of eyes to prevent and control myopia is achieved.

Description

Technical Field

[0001] This application relates to the field of telecentric optical technology, and particularly to a printed optical element, a printing method, and a telecentric optical instrument. Background Art

[0002] Telecentric display technology allows users to see a geometrically magnified image at a certain distance from the viewing screen. The image is presented by simulating the visible distance of real objects, so as to achieve a sense of distance in the presented picture of the reading body; telecentric display technology helps to reduce visual fatigue caused by long-term close eye use and protect eyesight; it can achieve changing the view from "near" to "far" and reduce the speed of myopia development.

[0003] Although telecentric display technology can, to a certain extent, alleviate the fatigue during eye viewing, however, during the process of long-term viewing of the screen of a telecentric optical instrument, the eye's lens is focused on the imaging surface corresponding to the reading body for a long time, which will still cause visual fatigue. The current telecentric optical instruments lack corresponding visual fatigue relief functions. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, this application provides a printed optical element, a printing method, and a telecentric optical instrument, which solve the problem that telecentric optical instruments are prone to cause visual fatigue during long-term use.

[0005] To achieve the above objectives, this application is realized through the following technical solutions: In a first aspect, an embodiment of this application provides a printed optical element. This printed optical element is applied to a telecentric optical instrument and is stacked with the free-form mirror of the telecentric optical instrument. The projection of the free-form mirror on the printed optical element along a first direction is located within the format of the printed optical element; the printed optical element includes a substrate and a patterned layer.

[0006] Specifically, the substrate is transparent and a printing area is provided on a first side; the patterned layer is located in the printing area and includes a plurality of functional parts protruding from the surface of the substrate. The plurality of functional parts are formed by UV printing and are distributed in a geometric array; among them, the functional parts are semi-transparent and in a continuous columnar form. The functional parts are adjacent to and spaced from the concave surface of the free-form mirror along the first direction; the functional parts are imaged by reflection of the free-form mirror onto the imaging panel of the telecentric optical instrument and present a first imaging surface; the first imaging surface and a second imaging surface presented by the telecentric optical instrument by magnifying an object are spaced apart; the first distance from the human eye lens to the first imaging surface is less than the second distance to the second imaging surface, and the focus can be switched between the first imaging surface and the second imaging surface by adjusting the focal length.

[0007] According to the first aspect of the embodiments of the present application, the substrate is an acrylic board and the format is rectangular. A plurality of functional parts are distributed in a discrete island shape in the printing area. The functional parts are semi-transparent gray dots and the transmittance ranges from 50% to 75%.

[0008] According to the first aspect of the embodiments of the present application, the functional parts are evenly distributed within the format corresponding to the printing area. The functional parts in the 2i-th row and the functional parts in the (2i - 1)-th row are offset within the format corresponding to the printing area, and the interval arrangement directions of the two are the same; where i is a positive integer.

[0009] According to the first aspect of the embodiments of the present application, the printing area completely covers the first side of the substrate. The number range of the functional parts distributed in an array in the printing area is from 98,000 to 100,000; the functional parts are cured ink.

[0010] According to the first aspect of the embodiments of the present application, the substrate further includes a blank area. The printing area surrounds the outside of the blank area. The blank area is in a regular circular shape and the corresponding diameter range is from 60 mm to 100 mm; the number range of the functional parts distributed in an array in the printing area is from 92,000 to 94,000, and the functional parts are cured ink.

[0011] According to the first aspect of the embodiments of the present application, an anti-reflection film is pasted on the second side of the substrate away from the patterned layer. The anti-reflection film completely covers the second side of the substrate to reduce the stray light reflected to the printing optical element.

[0012] According to the first aspect of the embodiments of the present application, the functional parts have a preset target thickness to protrude from the outer contour surface of the substrate. Any cross-section of the functional parts orthogonal to the first direction is circular and the diameter range of any cross-section is from 0.3 mm to 0.7 mm.

[0013] In a second aspect, the embodiments of the present application provide a printing method. The printing method includes: obtaining a substrate that meets preset printing conditions, where the preset printing conditions are used to control the flatness, cleanliness, haze, and reflectivity of the substrate; printing a patterned layer on the first side of the substrate through a digital printer to obtain a first printed board with a plurality of functional parts; bonding an anti-reflection film on the second side of the substrate of the first printed board to obtain a second printed board; where the anti-reflection film completely covers the second side of the substrate; testing the transmittance at the corresponding positions of the functional parts of the second printed board to determine whether the second printed board meets the preset standard application conditions; where the transmittance range under the standard application conditions is from 50% to 75%; when the second printed board meets the standard application conditions, confirming that the second printed board is qualified; when the second printed board does not meet the standard application conditions, removing the patterned layer of the second printed board and reprinting with a digital printer.

[0014] According to the second aspect of the embodiments of the present application, a digital printer has a positioning system for monitoring the position of a substrate during the printing process; before printing a patterned layer on the first side of the substrate by the digital printer to obtain a first printed board with multiple functional parts, the printing method further includes: verifying whether the edge of the outer peripheral surface of the substrate is in a preset target position, and the target position is used to calibrate the position information of the functional parts to be printed on the substrate.

[0015] The aforementioned process of printing a patterned layer on the first side of the substrate by the digital printer to obtain a first printed board with multiple functional parts includes the following steps: continuously monitoring the real-time position of the edge of the outer peripheral surface of the substrate during the UV printing process through the positioning system, and calculating the deviation between the real-time position and the target position; in the case of a deviation, determining whether the deviation exceeds a predetermined deviation tolerance range, and interrupting the printing operation of the digital printer and correcting the position of the substrate when the deviation exceeds the deviation tolerance range.

[0016] In a third aspect, the embodiments of the present application provide a telecentric optical instrument, which includes a printing optical element, a frame module, and an optical module; the printing optical element is the printing optical element of the aforementioned first aspect; the frame module includes a first frame body, a second frame body, and a third frame body that can be folded and unfolded; the optical module includes a free-form mirror, a plane mirror, and an imaging panel, and the free-form mirror, the plane mirror, and the imaging panel are respectively assembled on the first frame body, the second frame body, and the third frame body; wherein, the printing optical element is assembled on the side of the free-form mirror facing the second frame body, and when the frame module is in the unfolded state, the printing optical element is in a standard use state and extends along the second direction and the third direction.

[0017] The present application provides a printing optical element, a printing method, and a telecentric optical instrument. Compared with the prior art, it has the following beneficial effects: The present application provides a printing optical element on one side of the free-form mirror of the telecentric optical instrument. The free-form mirror is used for reflecting light, and a part of the light reflected by the free-form mirror is projected onto the functional parts of the patterned layer in the printing optical element. The functional parts are semi-transparent. With the cooperation of the components of the telecentric optical instrument, the functional parts are imaged onto the imaging panel of the telecentric optical instrument through the light reflection effect and present a first imaging surface; in addition, the telecentric optical instrument will also magnify and image an object through the projected light and obtain a second imaging surface; due to a certain distance between the free-form mirror and the printing optical element, the first imaging surface presented by the light reflection and diffuse reflection is closer to the user's lens than the second imaging surface; during the process of the user viewing the magnified information on the second imaging surface, the user can actively adjust the focal length to switch the focus between the first imaging surface and the second imaging surface, thereby relieving eye fatigue and achieving the effect of adjusting the lens of the eye to prevent myopia. Description of the Drawings

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0019] Figure 1 It is a schematic diagram of the imaging principle of a printing optical element provided by an embodiment of the present application for a tele-imaging optical instrument; Figure 2 It is a front view of a printing optical element provided by an embodiment of the present application; Figure 3 It is a front view of another printing optical element provided by an embodiment of the present application; Figure 4 It is Figure 3 an enlarged schematic view at position C in; Figure 5 It is a partial cross-sectional view of a printing optical element provided by an embodiment of the present application.

[0020] Reference numerals: free-form mirror 1; substrate 2; patterned layer 3; functional part 4; imaging panel 5; anti-reflection film 6; frame module 7; first frame 71; second frame 72; third frame 73; flat mirror 8; printing area A; blank area B; first imaging surface a; second imaging surface b; projection light c; viewing position d; first direction X1; second direction X2; third direction X3. Detailed implementation manners

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0022] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variants thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0023] By providing a printed optical element, a printing method and a telephoto optical instrument in the embodiments of the present application, the problem that the telephoto optical instrument is prone to cause visual fatigue during long-term use is solved.

[0024] The overall idea of the technical solution in the embodiments of the present application to solve the above technical problems is as follows: Telephoto display technology allows users to see a geometrically magnified image at a certain distance from the viewing screen. The image is presented by simulating the visible distance of real objects, so as to achieve a sense of distance in the presented picture of the reading body; telephoto display technology helps to reduce visual fatigue caused by long-term close eye use and protect eyesight; it can realize changing the view of "near" to "far" and reduce the speed of myopia development.

[0025] Although telephoto display technology can to some extent alleviate the fatigue feeling during eye viewing, however, during the process of long-term viewing of the screen, the lens of the eye is focused on the imaging surface of the reading body for a long time, which will still cause visual fatigue, and the current telephoto optical instrument lacks the corresponding visual fatigue relief function.

[0026] To better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings of the specification and specific embodiments.

[0027] First, a printed optical element provided by the embodiments of the present application will be introduced below.

[0028] A printed optical element provided by the embodiments of the present application, as Figure 1 and Figure 5 shown, this printed optical element is applied to a telephoto optical instrument and is stacked with the free-form mirror 1 of the telephoto optical instrument. The projection of the free-form mirror 1 on the printed optical element along the first direction X1 is within the format of the printed optical element; the printed optical element includes a substrate 2 and a patterned layer 3.

[0029] Specifically, please refer to Figure 2 , Figure 4 and Figure 5 simultaneously. The substrate 2 is transparent and has a printing area A on the first side; the patterned layer 3 is located in the printing area A and includes a plurality of functional parts 4 protruding from the surface of the substrate 2. The plurality of functional parts 4 are formed by UV printing and are distributed in a geometric array.

[0030] Among them, please refer to Figure 1 and Figure 5 simultaneously. The functional part 4 is semi-transparent and has a continuous columnar shape. The functional part 4 is adjacent to and spaced from the concave surface of the free-form mirror 1 along the first direction X1; the functional part 4 forms an image on the imaging panel 5 of the telephoto optical instrument through the reflection of the free-form mirror 1 and presents a first imaging surface a; the first imaging surface a and the second imaging surface b magnified by the telephoto optical instrument for the object are spaced apart; the first distance from the human eye lens to the first imaging surface a is less than the second distance to the second imaging surface b, and the focus can be switched between the first imaging surface a and the second imaging surface b by adjusting the focal length. It can be understood that the human eye lens of the viewer corresponds to Figure 1 the viewing position d in

[0031] In the embodiment of the present application, it can be understood that UV printing is a printing process that dries and cures ink through ultraviolet light. UV printing uses ink containing a photosensitizer. Under the irradiation of ultraviolet light emitted by a UV curing lamp, the photosensitizer in the ink quickly undergoes a photochemical reaction, causing the ink to instantly cure from a liquid state to a solid state.

[0032] In the present application, a printing optical element is provided on one side of the free-form mirror 1 of the telephoto optical instrument. The free-form mirror 1 is used for reflecting the projected light c. Part of the light reflected by the free-form mirror 1 is projected onto the functional part 4 of the patterned layer 3 in the printing optical element. The functional part 4 is semi-transparent. With the cooperation of the components of the telephoto optical instrument, the functional part 4 forms an image on the imaging panel 5 of the telephoto optical instrument through the action of light reflection and presents a first imaging surface a.

[0033] It should be noted that the telephoto optical instrument will also magnify and image the object through the projected light and obtain a second imaging surface b; due to a certain distance between the free-form mirror 1 and the printing optical element, the first imaging surface a presented by light reflection and diffuse reflection is closer to the user's lens than the second imaging surface b; during the process of the user viewing the magnified information on the second imaging surface b, the user can actively adjust the focal length to switch the focus between the first imaging surface a and the second imaging surface b, thereby adjusting the lens of the eye to relieve eye fatigue and achieving the effect of preventing and controlling myopia.

[0034] It should also be noted that the functional parts 4 are distributed in a geometric array to form a patterned layer 3. The functional parts 4 are arranged at intervals in the printing area A of the substrate 2. The functional parts 4 are semi-transparent, and a faint image will appear on the corresponding first imaging surface a. When the human eye focuses on the second imaging surface b behind the first imaging surface a, the first imaging surface a will not affect the clarity of the human eye's view of the second imaging surface b.

[0035] It should be emphasized that the printing optical element is a separate accessory. The printing optical element is used in combination with the telephoto optical instrument to solve the problem of visual fatigue that is likely to occur during the long-term use of the telephoto optical instrument. The printing optical element can be snap-fitted in front of the reflector of the telephoto optical instrument, or can also be fixed by pasting with an adhesive object.

[0036] In some embodiments, please refer to Figure 2 and Figure 4 , the substrate 2 is an acrylic board and the format is rectangular. A plurality of functional parts 4 are distributed in a discrete island-like form in the printing area A. The functional parts 4 are semi-transparent gray dots, and the transmittance range is: 50%-75%.

[0037] In the embodiments of the present application, it can be understood that the format shape of the substrate 2 matches the shape of the free-form mirror 1. Please refer to Figures 2 - 5 , a plurality of functional parts 4 are distributed in an island-like form in the printing area A, that is, a plurality of functional parts 4 are spaced apart and scattered in the format corresponding to the printing area A. The patterned layer 3 corresponding to the plurality of functional parts 4 does not occupy the entire format of the printing area A. Therefore, part of the light reflected by the free-form mirror 1 passes through the functional parts 4, and the other part directly passes through the substrate 2.

[0038] In addition, the acrylic board is polymerized from methyl methacrylate monomers and is a kind of specially treated organic glass. The acrylic board has excellent transparency, and the light transmittance can reach more than 92%. The light transmittance of the acrylic board is higher than that of ordinary glass, which is beneficial to better highlighting details to improve the visual effect.

[0039] In some embodiments, please refer to Figure 2 and Figure 4 , the functional parts 4 are evenly distributed in the format corresponding to the printing area A. The functional parts 4 in the 2i-th row and the functional parts 4 in the (2i - 1)-th row are arranged in a staggered manner in the format corresponding to the printing area A, and the interval arrangement directions of the two are the same. Wherein, i is a positive integer.

[0040] In the embodiments of the present application, it can be understood that the functional parts 4 in the 2i-th row and the functional parts 4 in the (2i - 1)-th row respectively correspond to the even-row functional parts 4 and the odd-row functional parts 4 in the format of the printing area A. As Figure 4 shown, a plurality of functional parts 4 can form a combination in a regular hexagon array, and the functional parts 4 are in a regular hexagon geometric array on the substrate 2.

[0041] In one example, please refer to Figure 2 and Figure 5 , the printing area A is fully distributed on the first side of the substrate 2, and the number range of the functional parts 4 arranged in an array in the printing area A is: 98000 - 100000; the functional parts 4 are cured ink. Exemplarily, the printing area A can be fully distributed with 98971 functional parts 4.

[0042] In another example, please refer to Figure 3 and Figure 5 , the substrate 2 further includes a blank area B, the printing area A is disposed around the outside of the blank area B, the blank area B is in a regular circular shape and the corresponding diameter range is: 60 mm - 100 mm; the number range of the functional parts 4 arranged in an array in the printing area A is: 92000 - 94000; the functional parts 4 are cured ink. Exemplarily, the printing area A can be partially arranged with 93161 functional parts 4, and the diameter of the blank area B can be set at about 80 mm.

[0043] It can be understood that a blank area B is provided at the central position of the substrate 2, and no functional parts 4 are printed in the blank area B. Compared with the method of fully distributing the functional parts 4 on the substrate 2, setting the blank area B is more conducive to the human eye focusing on the second imaging surface b.

[0044] In some embodiments, as Figure 5 shown, an anti-reflection film 6 is pasted on the second side of the substrate 2 away from the patterning layer 3, and the anti-reflection film 6 is fully distributed on the second side of the substrate 2 to reduce the stray light reflected to the printing optical element.

[0045] In the embodiments of the present application, it can be understood that based on the optical interference phenomenon, the anti-reflection film 6 controls the thickness and refractive index of the film layer precisely, so that some reflected light waves cancel each other out, thereby achieving the effect of reducing the reflection of stray light. The anti-reflection film 6 is formed by alternately depositing multiple layers of materials with different refractive indices, and the thickness of each layer is about a quarter of the wavelength. The anti-reflection film 6 can effectively reduce the light reflection, allow more light to pass through, improve the transmittance of the substrate 2, reduce the glare caused by reflection, and improve the visual comfort and contrast.

[0046] In some embodiments, please refer to Figure 4 and Figure 5 , the functional part 4 has a preset target thickness to protrude from the outer contour surface of the substrate 2, and any cross-section of the functional part 4 orthogonal to the first direction X1 is circular and the diameter range of any cross-section is 0.3 mm - 0.7 mm.

[0047] In one example, the diameter of the circular cross-section of each functional part 4 can be 0.5 mm, and the center distance between the circular cross-sections of two adjacent functional parts 4 is set to 1 mm.

[0048] In another example, the ratio between the target thickness corresponding to the functional part 4 and the thickness of the substrate 2 is greater than one-tenth. It can be understood that the target thickness corresponding to the functional part 4 is related to the image depth corresponding to the first imaging surface a. By adjusting the target thickness corresponding to the functional part 4, the image depth on the first imaging surface a can be adjusted. Furthermore, when the human eye switches the focus on the first imaging surface a and the second imaging surface b by adjusting the focal length, it can be in a comfortable state and the clarity when viewing the second imaging surface b can be ensured.

[0049] In some embodiments, the present application provides a printing method, and the printing method may include the following steps: S110. Obtain a substrate 2 that meets the preset printing conditions, and the preset printing conditions are used to control the flatness, cleanliness, haze, and reflectivity of the substrate 2.

[0050] S120. Print a patterned layer 3 on the first side of the substrate 2 through a digital printer to obtain a first printed board having a plurality of functional parts 4.

[0051] S130. Bond an anti-reflection film 6 on the second side of the substrate 2 of the first printed board to obtain a second printed board; wherein, the anti-reflection film 6 covers the second side of the substrate 2.

[0052] S140. Test the transmittance at the position corresponding to the functional part 4 of the second printed board to determine whether the second printed board meets the preset standard application conditions; wherein, the transmittance range under the standard application conditions is 50%-75%.

[0053] S150. When the second printed board meets the standard application conditions, confirm that the second printed board is qualified.

[0054] S160. When the second printed board does not meet the standard application conditions, remove the patterned layer 3 of the second printed board and reprint it using a digital printer.

[0055] In some embodiments, the digital printer has a positioning system, and the positioning system is used to monitor the position of the substrate 2 during the printing process.

[0056] Before printing the patterned layer 3 on the first side of the substrate 2 through the digital printer to obtain a first printed board having a plurality of functional parts 4, that is, before S120, the printing method further includes: S111. Check whether the outer peripheral edge of the substrate 2 is at a preset target position, and the target position is used to calibrate the position information of the functional part 4 to be printed on the substrate 2.

[0057] In some embodiments, printing the patterned layer 3 on the first side of the substrate 2 through the digital printer to obtain a first printed board having a plurality of functional parts 4, that is, S120 specifically may include the following steps: S210. Continuously monitor the real-time position of the outer peripheral edge of the substrate 2 during the UV printing process through a positioning system, and calculate the deviation between the real-time position and the target position.

[0058] S220. In the case of a deviation, determine whether the deviation exceeds a predetermined deviation tolerance range. When the deviation exceeds the deviation tolerance range, interrupt the printing operation of the digital printer and correct the position of the substrate 2.

[0059] In some embodiments, the present application provides a telecentric optical instrument. Please refer to Figure 1 , the telecentric optical instrument includes a printing optical element, a frame module 7 and an optical module; the printing optical element is the printing optical element in the foregoing embodiment; the frame module 7 includes a first frame body 71, a second frame body 72 and a third frame body 73 that can be folded and unfolded.

[0060] Specifically, the optical module includes a free-form mirror 1, a plane mirror 8 and an imaging panel 5. The free-form mirror 1, the plane mirror 8 and the imaging panel 5 are respectively assembled on the first frame body 71, the second frame body 72 and the third frame body 73; wherein, the printing optical element is assembled on the side of the free-form mirror 1 facing the second frame body 72. When the frame module 7 is in the unfolded state, the printing optical element is in the standard use state and extends along the second direction X2 and the third direction X3.

[0061] It should be noted that when the telecentric optical instrument provided in the embodiment of the present application is in the unfolded state of the frame module 7, the object to be magnified is placed on the lower side of the second frame body 72, and the object corresponds to Figure 1 the starting point of the projection light c. The telecentric optical instrument can magnify the object 14.25 to 42.75 times on the second imaging surface b.

[0062] In the embodiment of the present application, it can be understood that the present application mounts the printing optical element in front of the free-form mirror 1 of the telecentric optical instrument. The free-form mirror 1 is a reflecting mirror. The free-form mirror 1 reflects and images the functional part 4 formed by UV printing on the printing optical element onto the imaging panel 5. Since there is a certain distance between the printing optical element and the free-form mirror 1, there will be a certain distance between the image of the functional part 4 and the image of the reading material placed on the lower side of the second frame body 72, that is, the first imaging surface a and the second imaging surface b are spaced apart.

[0063] Furthermore, the first imaging surface a is on the upper layer of the second imaging surface b, that is, the first imaging surface a is closer to the human eye than the second imaging surface b. The functional part 4 printed with UV on the printing optical element has transparency and will present a faint image during imaging. When the focal length of the human eye is on the second imaging surface b corresponding to the reading object, the first imaging surface a corresponding to the functional part 4 printed with UV on the printing optical element cannot be seen, and only when the focal length is projected onto the first imaging surface a can the image of the functional part 4 be seen. When the user reads with the tele-optical instrument for a long time, by actively switching the viewing between the first imaging surface a and the second imaging surface b, the effect of adjusting the lens of the eye and preventing and controlling myopia can be achieved.

[0064] In summary, compared with the prior art, the present application has the following beneficial effects: 1. In the present application, a printing optical element is arranged on one side of the free-form surface mirror 1 of the tele-optical instrument. Part of the light reflected by the free-form surface mirror 1 is projected onto the functional part 4 of the patterned layer 3 in the printing optical element. The functional part 4 forms an image on the imaging panel 5 of the tele-optical instrument through the reflection of light and presents the first imaging surface a. The first imaging surface a is arranged at an interval from the second imaging surface b presented after the object is magnified; the user can actively adjust the focal length to switch the focus between the first imaging surface a and the second imaging surface b, thereby adjusting the lens of the eye to relieve eye fatigue.

[0065] 2. The functional parts 4 are arranged at intervals in the printing area A of the substrate 2. The functional parts 4 are semi-transparent and the corresponding first imaging surface a will present a faint image layer. When the human eye focuses on the second imaging surface b behind the first imaging surface a, the first imaging surface a will not affect the clarity of the human eye's viewing of the second imaging surface b.

[0066] 3. In the present application, a blank area B with a certain range can be reserved at the center position of the substrate 2. The blank area B is not printed with the functional part 4. Compared with the method of fully covering the substrate 2 with the functional part 4, setting the blank area B is beneficial for the human eye to focus on the second imaging surface b and ensure the viewing experience.

[0067] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A printed optical element, characterized in that, Applied to a telecentric optical instrument and stacked with a free-form mirror (1) of the telecentric optical instrument, the projection of the free-form mirror (1) on the printing optical element in a first direction is located within the format of the printing optical element; The printing optical element includes a substrate (2) and a patterned layer (3); The substrate (2) is transparent and has a printing area (A) on a first side; The patterned layer (3) is located in the printing area (A) and includes a plurality of functional parts (4) protruding from the surface of the substrate (2), and the plurality of functional parts (4) are formed by UV printing and are distributed in a geometric array; Wherein, the functional part (4) is semi-transparent and has a continuous columnar shape, and the functional part (4) is adjacent to and spaced from the concave surface of the free-form mirror (1) in the first direction; The functional part (4) is reflected by the free-form mirror (1) to form an image on an imaging panel (5) of the telecentric optical instrument and presents a first imaging surface (a); The first imaging surface (a) is spaced from a second imaging surface (b) magnified by the telecentric optical instrument for an object; the first distance from the human eye lens to the first imaging surface (a) is less than the second distance to the second imaging surface (b), and the focus can be switched between the first imaging surface (a) and the second imaging surface (b) by adjusting the focal length.

2. The printed optical element according to claim 1, characterized in that, The substrate (2) is an acrylic plate and its format is rectangular. A plurality of the functional parts (4) are distributed in a discrete island shape in the printing area (A). The functional part (4) is a semi-transparent gray dot and the transmittance range is: 50% - 75%.

3. The printed optical element according to claim 2, wherein, The functional parts (4) are evenly distributed within the format corresponding to the printing area (A). The functional parts (4) in the 2i-th row and the functional parts (4) in the 2i - 1-th row are misaligned within the format corresponding to the printing area (A), and the interval arrangement directions of the two are the same; wherein, i is a positive integer.

4. The printed optical element according to any one of claims 1 to 3, characterized in that, The printing area (A) completely covers the first side of the substrate (2). The number range of the functional parts (4) distributed in an array in the printing area (A) is: 98000 - 100000; the functional part (4) is cured ink.

5. The printed optical element according to any one of claims 1 to 3, characterized in that, The substrate (2) further includes a blank area (B). The printing area (A) surrounds the outside of the blank area (B). The blank area (B) is in a regular circular shape and the corresponding diameter range is: 60mm - 100mm; The number range of the functional parts (4) distributed in an array in the printing area (A) is: 92000 - 94000, and the functional part (4) is cured ink.

6. The printed optical element according to any one of claims 1-3, characterized in that, An anti-reflection film (6) is pasted on a second side of the substrate (2) away from the patterned layer (3). The anti-reflection film (6) completely covers the second side of the substrate (2) to reduce stray light reflected to the printing optical element.

7. The printing optical element according to claim 6, wherein The functional part (4) has a preset target thickness to protrude from the outer contour surface of the substrate (2). Any cross-section of the functional part (4) orthogonal to the first direction is circular and the diameter range of any cross-section is 0.3mm - 0.7mm.

8. A printing method, characterized in that, Including: Obtain a substrate (2) that meets preset printing conditions, where the preset printing conditions are used to control the flatness, cleanliness, haze, and reflectivity of the substrate (2); Print a patterned layer (3) on the first side of the substrate (2) through a digital printer to obtain a first printed board having a plurality of functional parts (4); Bond an anti-reflection film (6) to the second side of the substrate (2) of the first printed board to obtain a second printed board; wherein, the anti-reflection film (6) covers the second side of the substrate (2); Test the transmittance at the corresponding positions of the functional parts (4) of the second printed board to determine whether the second printed board meets preset standard application conditions; wherein, the transmittance range under the standard application conditions is 50%-75%; When the second printed board meets the standard application conditions, confirm that the second printed board is qualified; When the second printed board does not meet the standard application conditions, remove the patterned layer (3) of the second printed board and reprint using the digital printer.

9. The printing method according to claim 8, characterized in that, The digital printer has a positioning system, and the positioning system is used to monitor the position of the substrate (2) during the printing process; Before printing the patterned layer (3) on the first side of the substrate (2) through the digital printer to obtain a first printed board having a plurality of functional parts (4), the printing method further includes: Verify whether the edge of the outer peripheral surface of the substrate (2) is at a preset target position, and the target position is used to calibrate the position information of the substrate (2) where the functional part (4) is to be printed; The step of printing the patterned layer (3) on the first side of the substrate (2) through the digital printer to obtain a first printed board having a plurality of functional parts (4) includes: Continuously monitor the real-time position of the edge of the outer peripheral surface of the substrate (2) during the UV printing process through the positioning system, and calculate the deviation between the real-time position and the target position; In the case of the existence of the deviation, determine whether the deviation exceeds a predetermined deviation tolerance range, and when the deviation exceeds the deviation tolerance range, interrupt the printing operation of the digital printer and correct the position of the substrate (2).

10. A telecentric optical instrument, characterized in that including: A printing optical element, which is the printing optical element according to any one of claims 1-7; A frame module (7), including a first frame body (71), a second frame body (72), and a third frame body (73) that can be folded and unfolded; and An optical module, including a free-form mirror (1), a plane mirror (8), and an imaging panel (5), and the free-form mirror (1), the plane mirror (8), and the imaging panel (5) are respectively assembled on the first frame body (71), the second frame body (72), and the third frame body (73); Wherein, the printing optical element is assembled on the side of the free-form mirror (1) facing the second frame body (72), and when the frame module (7) is in the unfolded state, the printing optical element is in the standard use state to extend along the second direction and the third direction.

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