Method and device for measuring transparency of three-dimensional printing materials, and storage medium

Abstract

The present application provides a method and device for measuring the transparency of a three-dimensional printing material, and a storage medium, wherein the method includes: obtaining a basic color three-dimensional object, wherein the three-dimensional printing material used by the basic color three-dimensional object includes a basic color colorant; measuring a first transmission spectrum of the basic color three-dimensional object and a second transmission spectrum of air in the visible light region; obtaining a first average transmittance of the basic color band, a second average transmittance of the opposite color band, and a total transmittance of the basic color based on the first transmission spectrum, and obtaining a total transmittance of the air based on the second transmission spectrum; and calculating the transparency of the three-dimensional printing material. The present application provides a method for measuring the transparency of a three-dimensional printing material, which can clearly indicate the transparency characteristics of the three-dimensional printing material, and can be applied to reasonably control the mass concentration of the basic color colorant when preparing the basic color three-dimensional printing material.

Description

Technical Field

[0001] The present application relates to the field of three-dimensional printing technology, and in particular to a method and device for measuring the transparency of three-dimensional printing materials, and a storage medium. Background Art

[0002] In traditional two-dimensional printing, transparency is usually measured by measuring the amount of scattered light generated by the ink layer. The two-dimensional transparency measurement value is to print the primary color ink of a specified ink layer thickness (about 1μm) on a black substrate, calculate the color difference between the chromaticity value after the ink layer thickness changes and the original black background chromaticity value, and then make a straight line fit between the ink layer thickness and the corresponding color difference data. The inverse of the slope obtained is the two-dimensional transparency measurement value. The ink layer thickness in three-dimensional printing is much greater than that in two-dimensional printing, and the ink layer thickness of the smallest ink drop output is also about 10μm. The order of magnitude difference in the precision control of the ink layer thickness determines that three-dimensional printing cannot adopt the transparency measurement method in two-dimensional printing.

[0003] Similarly, in traditional two-dimensional printing, various rich color changes are combined based on the ratio of cyan (C), magenta (M), yellow (Y), and K (black) primary colors to form a two-dimensional printed output color gamut. CMYK ink droplets exist in a state where up to four layers of 0.5μm~1.5μm thick ink layers overlap or are arranged in parallel. CMYK ink itself only needs a small amount of transparent properties to ensure smooth mixing between the basic colors, so that the final color gamut meets the visual needs of the human eye to a large extent. In color three-dimensional inkjet printing, the thickness of each ink droplet is about 10μm. Usually, in order to obtain sufficient color saturation, the superimposed layer thickness of the ink droplets reaches between 0.5mm and 1mm, and some output thickness requirements are even higher. This requires 50~100 layers, or even more layers of ink droplets to be overprinted and accumulated. At this time, without sufficient transparency of the printing material, the color rendering effect may deviate to a large extent from the general color rendering rule based on the mixing of three basic primary color materials to obtain rich natural colors. Therefore, in color 3D inkjet printing technology, the transparency control of 3D printing materials is a key factor affecting the color rendering quality after the basic colors are mixed, which is significantly different from the color rendering of traditional 2D printing methods.

[0004] When the transparency of basic color inks of different hues is not well matched, the color rendering effect of the ink cannot be fully exerted, resulting in defects in the color rendering range of the printed three-dimensional object and unnatural color transition. Therefore, it is necessary to find a measurement method suitable for the transparency of three-dimensional printing materials to clearly indicate the transparency characteristics of three-dimensional printing materials and ensure that the final color reproduction satisfies the visual experience of the human eye to a large extent. Summary of the invention

[0005] The embodiments of the present application provide a method and device for measuring transparency of a three-dimensional printing material, and a storage medium, which can clearly indicate the transparency characteristics of the three-dimensional printing material.

[0006] In a first aspect, the present application provides a method for measuring transparency of a three-dimensional printing material, the method comprising the following steps:

[0007] Acquire a basic color three-dimensional object using the three-dimensional printing material to be measured, wherein the three-dimensional printing material used for the basic color three-dimensional object includes a basic color colorant;

[0008] Measuring a first transmission spectrum of the three-dimensional object with the basic color and a second transmission spectrum of air in the visible light region;

[0009] Based on the first transmission spectrum, obtain the total transmittance of the basic color, the first average transmittance of the basic color band, and the second average transmittance of the opposite color band; based on the second transmission spectrum, obtain the total transmittance of air;

[0010] Calculate the ratio of the second average transmittance to the first average transmittance , calculate the ratio of the total transmittance of the basic color to the total transmittance of the air , obtain the transparency T of the three-dimensional printing material to be measured, Formula (1).

[0011] In combination with the first aspect, in some embodiments, the second average transmittance of the opposite color band is ,in, is the starting point of the opposite color band, is the end point of the opposite color band, is the transmittance of each wavelength in the opposite color band, is the number of wavelengths corresponding to the opposite color bands.

[0012] In combination with the first aspect, in some embodiments, the first average transmittance of the basic color band is ,in, is the starting point of the basic color band. is the end point of the basic color band, is the transmittance of each wavelength in the basic color band, is the number of wavelengths corresponding to the basic color band.

[0013] In combination with the first aspect, in some embodiments, the ratio of the second average transmittance to the first average transmittance is , calculated according to formula (2): (2).

[0014] In combination with the first aspect, in some embodiments, the ratio of the total transmittance of the basic color to the total transmittance of the air is , calculated according to formula (3): (3);

[0015] in, is the starting point of the wavelength in the visible light region, is the end point of the wavelength in the visible light region, It represents the transmittance of three-dimensional objects with basic colors in the visible light region. Indicates the transmittance of air in the visible light region.

[0016] In combination with the first aspect, in some embodiments, the basic color three-dimensional object is a three-dimensional model of a regular shape.

[0017] In combination with the first aspect, in some embodiments, a first transmission spectrum of the basic color three-dimensional object and a second transmission spectrum of air are measured in the visible light region using a spectrophotometer; wherein at least two dimensions of the three-dimensional object are greater than or equal to the measurement aperture of the spectrophotometer.

[0018] In combination with the first aspect, in some embodiments, the method further includes:

[0019] Whether the transparency relationship of the different three-dimensional printing materials is reasonable is judged according to the transparency of the different three-dimensional printing materials, wherein the basic color materials in the different three-dimensional printing materials are different.

[0020] In combination with the first aspect, in some embodiments, the method further includes:

[0021] When the transparency relationship of the different three-dimensional printing materials is unreasonable, the mass concentration of the basic color material in the three-dimensional printing material is adjusted to make the transparency relationship of the different three-dimensional printing materials reasonable.

[0022] In combination with the first aspect, in some embodiments, the method further includes:

[0023] When the absolute value of the difference between the transparencies of any two different three-dimensional printing materials is less than or equal to 5, the transparencies of the different three-dimensional printing materials are reasonable.

[0024] In a second aspect, the present application provides a transparency measurement device for a three-dimensional printed material, the device comprising:

[0025] A first acquisition unit is used to acquire a basic color three-dimensional object using a three-dimensional printing material to be measured, wherein the three-dimensional printing material used by the basic color three-dimensional object includes a basic color colorant;

[0026] A second acquisition unit is used to measure a first transmission spectrum of the basic color three-dimensional object and a second transmission spectrum of air in the visible light region;

[0027] a first calculation unit, configured to obtain a total transmittance of a basic color, a first average transmittance of a basic color band, and a second average transmittance of an opposite color band based on the first transmission spectrum, and obtain a total transmittance of air based on the second transmission spectrum;

[0028] A second calculation unit, configured to calculate a ratio of the second average transmittance to the first average transmittance , calculate the ratio of the total transmittance of the basic color to the total transmittance of the air , obtain the transparency T of the three-dimensional printing material to be measured, Formula (1).

[0029] In conjunction with the second aspect, in some embodiments, the second average transmittance of the opposite color band is ,in, is the starting point of the opposite color band, is the end point of the opposite color band, is the transmittance of each wavelength in the opposite color band, is the number of wavelengths corresponding to the opposite color bands.

[0030] In conjunction with the second aspect, in some embodiments, the first average transmittance of the basic color band is ,in, is the starting point of the basic color band. is the end point of the basic color band, is the transmittance of each wavelength in the basic color band, is the number of wavelengths corresponding to the basic color band.

[0031] In conjunction with the second aspect, in some embodiments, the ratio of the second average transmittance to the first average transmittance is , calculated according to formula (2): (2).

[0032] In conjunction with the second aspect, in some embodiments, the ratio of the total transmittance of the primary color to the total transmittance of the air is , calculated according to formula (3): (3);

[0033] Among them, among them, is the starting point of the wavelength in the visible light region, is the end point of the wavelength in the visible light region, It represents the transmittance of three-dimensional objects with basic colors in the visible light region. Indicates the transmittance of air in the visible light region.

[0034] In combination with the second aspect, in some embodiments, the basic color three-dimensional object is a three-dimensional model of a regular shape.

[0035] In combination with the second aspect, in some embodiments, the second acquisition unit is a spectrophotometer, and at least two dimensions of the three-dimensional object are greater than or equal to a measurement aperture of the spectrophotometer.

[0036] In conjunction with the second aspect, in some embodiments, the device further includes:

[0037] The judging unit is used to judge whether the transparency relationship of different 3D printing materials is reasonable according to the transparency of the different 3D printing materials, wherein the basic color materials in the different 3D printing materials are different.

[0038] In a third aspect, the present application further provides a computer non-volatile storage medium, wherein the storage medium includes a stored program, and when the program is executed, the device where the storage medium is located is controlled to execute the method for measuring transparency of three-dimensional printing materials described in the first aspect.

[0039] In a fourth aspect, the present application further provides a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the method for measuring transparency of three-dimensional printing materials as described in the first aspect when executing the computer program.

[0040] The technical solution of this application has at least the following beneficial effects:

[0041] The present application provides a transparency measurement method and device for three-dimensional printing materials, and a storage medium. The first average transmittance of the basic color band and the second average transmittance of the opposite color band are obtained by obtaining the first transmission spectrum of the basic color three-dimensional object model, and the total transmittance of the air is obtained based on the second transmission spectrum, so that the transparency of the three-dimensional printing material is calculated according to the ratio of the second average transmittance to the first average transmittance and the ratio of the total transmittance of the basic color to the total transmittance of the air, and the ratio of the concentration of the colorant in the three-dimensional printing material can be measured more accurately. Through this scheme, the transparency characteristics of the three-dimensional printing material can be clearly characterized, so that the transparency relationship of different three-dimensional printing materials can be judged according to the transparency. Whether it is reasonable, avoids the problem that the color rendering function of the ink colorant cannot be fully exerted due to the mismatch of the transparency of the basic color colorants of different hues, resulting in defects in the color rendering range and unnatural color transition.

[0042] It should be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0044] Figure 1 A schematic diagram of a process of measuring transparency of a three-dimensional printing material according to an embodiment of the present application;

[0045] Figure 2 A schematic diagram of a process of measuring transparency of a three-dimensional printing material according to another embodiment of the present application;

[0046] Figure 3a-3c The visible light transmission spectrum of the three-dimensional object in the specific embodiment of the present application;

[0047] Figure 4 This is a schematic diagram of a structural block diagram of a device for measuring transparency of three-dimensional printing materials in another specific embodiment of the present application;

[0048] Figure 5 This is a schematic diagram of a structural block diagram of a computer device in another specific embodiment of the present application;

[0049] Figure 6 This is a schematic diagram of a structural block diagram of a three-dimensional printing material transparency measurement system in another specific embodiment of the present application.

[0050] Reference numerals:

[0051] 10-first acquisition unit; 20-second acquisition unit; 30-first calculation unit; 40-second calculation unit; 50-judgment unit; 100-computer device; 101-processor; 102-memory; 103-computer program; 200-system; 201-detection component; 202-processor; 203-memory.

[0052] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application. DETAILED DESCRIPTION

[0053] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0054] It should be clear that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0055] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0056] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0057] Terminology: Transparency refers to the ability of a material to allow light to pass through it and reveal the color of the obscured surface.

[0058] In traditional two-dimensional printing, transparency is usually measured by measuring the amount of scattered light generated by the ink layer. The two-dimensional transparency measurement value is to print the primary color ink of a specified ink layer thickness (about 1μm) on a black substrate, calculate the color difference between the chromaticity value after the ink layer thickness changes and the original black background chromaticity value, and then make a straight line fit between the ink layer thickness and the corresponding color difference data. The inverse of the slope obtained is the two-dimensional transparency measurement value. The ink layer thickness in three-dimensional printing is much greater than that in two-dimensional printing, and the ink layer thickness of the smallest ink drop output is also about 10μm. The order of magnitude difference in the precision control of the ink layer thickness determines that three-dimensional printing cannot adopt the transparency measurement method in two-dimensional printing.

[0059] Similarly, in traditional two-dimensional printing, various rich color changes are combined based on the ratio of cyan (C), magenta (M), yellow (Y), and K (black) primary colors to form a two-dimensional printed output color gamut. CMYK ink droplets exist in a state where up to four layers of 0.5μm~1.5μm thick ink layers overlap or are arranged in parallel. CMYK ink itself only needs a small amount of transparent properties to ensure smooth mixing between the basic colors, so that the final color gamut meets the visual needs of the human eye to a large extent. In color three-dimensional inkjet printing, the thickness of each ink droplet is about 10μm. Usually, in order to obtain sufficient color saturation, the superimposed layer thickness of the ink droplets reaches between 0.5mm and 1mm, and some output thickness requirements are even higher. This requires 50~100 layers, or even more layers of ink droplets to be overprinted and accumulated. At this time, without sufficient transparency of the printing material, the color rendering effect may deviate to a large extent from the general color rendering rule based on the mixing of three basic primary color materials to obtain rich natural colors. Therefore, in color 3D inkjet printing technology, the transparency control of 3D printing materials is a key factor affecting the color rendering quality after the basic colors are mixed, which is significantly different from the color rendering of traditional 2D printing methods.

[0060] When the transparency of basic color inks of different hues is not well matched, the color rendering effect of the ink cannot be fully exerted, resulting in defects in the color rendering range of the printed three-dimensional object and unnatural color transition. Therefore, it is necessary to find a measurement method suitable for the transparency of three-dimensional printing materials to clearly indicate the transparency characteristics of three-dimensional printing materials, so as to ensure that the final color reproduction satisfies the visual experience of the human eye to a large extent.

[0061] Figure 1 This is a flow chart of a method for measuring transparency of a three-dimensional printed material in a specific embodiment of the present application. The method for measuring transparency of a three-dimensional printed material in the present application includes the following steps S1 to S4:

[0062] Step S1, obtaining a basic color three-dimensional object using a three-dimensional printing material to be measured, wherein the three-dimensional printing material used for the basic color three-dimensional object includes a basic color colorant;

[0063] Step S2, measuring a first transmission spectrum of the basic color three-dimensional object and a second transmission spectrum of air in the visible light region;

[0064] Step S3, obtaining the total transmittance of the basic color, the first average transmittance of the basic color band, and the second average transmittance of the opposite color band based on the first transmission spectrum, and obtaining the total transmittance of air based on the second transmission spectrum;

[0065] Step S4: Calculate the ratio of the second average transmittance to the first average transmittance , calculate the ratio of the total transmittance of the basic color to the total transmittance of the air , obtain the transparency T of the three-dimensional printing material to be measured, Formula (1).

[0066] In this solution, the first transmission spectrum of the basic color three-dimensional object is obtained to obtain the first average transmittance of the basic color band and the second average transmittance of the opposite color band, and the total transmittance of the air is obtained based on the second transmission spectrum. The transparency of the three-dimensional printing material is calculated according to the ratio of the second average transmittance to the first average transmittance and the ratio of the total transmittance of the basic color to the total transmittance of the air, which can more accurately measure the ratio relationship of the colorant dosage in the three-dimensional printing material.

[0067] The present invention is described in detail below in conjunction with the embodiments and the measurement method provided in this application:

[0068] Step S1, obtaining a basic color three-dimensional object using a three-dimensional printing material to be measured, wherein the three-dimensional printing material used for the basic color three-dimensional object includes a basic color colorant.

[0069] In this embodiment, the three-dimensional object is printed and formed using three-dimensional printing technology. In three-dimensional inkjet printing technology, the material used is usually liquid resin, and the coloring method is to mix the colorants to produce color. The three primary colors of the colorants are cyan (C), magenta (M), and yellow (Y). These three primary colors have the property that no matter what proportion two of them are mixed, the third primary color cannot be produced. The coloring of the colorants is subtractive color mixing, that is, each of their colors subtracts a certain one-third of monochromatic light from the composite white light, and reflects or transmits two-thirds of the colored light accordingly. It is customary to regard the primary color magenta of the colorant subtractive color method as subtracting green, yellow as subtracting blue, and cyan as subtracting red. Because each of the three primary colors of the subtractive color method is equivalent to the color after subtracting a spectral color light from white light, and this name can correspond to the names of the three primary colors of the additive color method.

[0070] In this embodiment, the basic color is also called the primary color, and the basic color is selected from at least one of cyan (C), magenta (M), and yellow (Y). Each basic color corresponds to an opposite color, and the opposite color is the color of white light minus a basic color light. The opposite color of cyan (C) is red (R), the opposite color of magenta (M) is green (G), and the opposite color of yellow (Y) is blue (B).

[0071] In some embodiments, the primary color colorants include a cyan colorant, a magenta colorant, and a yellow colorant.

[0072] The three-dimensional object is a three-dimensional model of a regular shape, and at least two dimensions of the three-dimensional object are greater than or equal to the measuring aperture of the measuring instrument. In some embodiments, the measuring aperture is 25 mm. The three-dimensional object can be at least one of a cuboid of 50 mm long × 50 mm wide × 0.3 mm thick, a cuboid of 50 mm long × 50 mm wide × 0.5 mm thick, a cuboid of 50 mm long × 50 mm wide × 0.7 mm thick, and a cuboid of 50 mm long × 50 mm wide × 1.0 mm thick.

[0073] Step S2, measuring a first transmission spectrum of the basic color three-dimensional object and a second transmission spectrum of air in the visible light region.

[0074] In this embodiment, the transmission spectrum of the three-dimensional object is measured in the visible light region using a spectrophotometer. Specifically, the visible light region ranges from 380nm to 700nm, and the basic color three-dimensional object is the first transmission spectrum. Specifically, the transmission spectrum of the three-dimensional object (a cuboid with a length of 50mm, a width of 50mm, and a thickness of 0.5mm) is measured in the visible light region of 380nm to 700nm using an X-RiteColor i7 spectrophotometer with a LAV aperture of 25mm. In this embodiment, Figure 3a~Figure 3b As shown, it is the transmission spectrum diagram of the three-dimensional object model of each basic color.

[0075] In some embodiments, step S2 further includes: measuring a second transmission spectrum of air in the visible light region using a spectrophotometer.

[0076] In other embodiments, step S2 further includes: obtaining a colorless and transparent standard three-dimensional object, measuring the transmission spectrum of the standard three-dimensional object in the visible light region using a spectrophotometer, and considering the transmission spectrum of the standard three-dimensional object as the second transmission spectrum of air.

[0077] Step S3, obtaining the total transmittance of the basic color, the first average transmittance of the basic color band, and the second average transmittance of the opposite color band based on the first transmission spectrum, and obtaining the total transmittance of air based on the second transmission spectrum.

[0078] It should be noted that the basic color band of cyan in the visible light region is 380nm~600nm, and the opposite color band of cyan in the visible light region is 610nm~700nm; the basic color band of magenta in the visible light region is 380nm~500nm and 610nm~700nm, and the opposite color band of magenta in the visible light region is 510nm~600nm; the basic color band of yellow in the visible light region is 510nm~700nm, and the opposite color band of yellow in the visible light region is 380nm~500nm.

[0079] In this embodiment, the first transmission spectrum of the basic color is obtained by measuring the three-dimensional object of the basic color.

[0080] The first average transmittance of the basic color band is obtained based on the first transmission spectrum. Specifically, according to the formula The first average transmittance of the basic color band is obtained, where is the starting point of the basic color band. is the end point of the basic color band, is the transmittance of each wavelength in the basic color band, is the number of wavelengths corresponding to the basic color band.

[0081] The second average transmittance of the opposite color band is obtained based on the first transmission spectrum. Specifically, according to the formula The second average transmittance of the opposite color band is obtained, where is the starting point of the opposite color band, is the end point of the opposite color band, is the transmittance of each wavelength in the opposite color band, is the number of wavelengths corresponding to the opposite color bands.

[0082] Step S4: Calculate the ratio of the second average transmittance to the first average transmittance , calculate the ratio of the total transmittance of the basic color to the total transmittance of the air , obtain the transparency T of the three-dimensional printing material to be measured, Formula (1).

[0083] The ratio of the second average transmittance to the first average transmittance , calculated according to formula (2):

[0084] (2).

[0085] Specifically, taking the wavelength interval of 10 nm as an example, the ratio of the second average transmittance of the cyan three-dimensional object to the first average transmittance is ,

[0086] Ratio of the second average transmittance to the first average transmittance of the magenta three-dimensional object ,

[0087]

[0088] The ratio of the second average transmittance to the first average transmittance of the yellow three-dimensional object ,

[0089]

[0090] Furthermore, since different colors have different total absorption of light, it is necessary to calculate the ratio of the total transmittance of the basic color to the total transmittance of the air. , calculated according to formula (3) :

[0091] (3);

[0092] in, is the starting point of the wavelength in the visible light region, is the end point of the wavelength in the visible light region, It represents the transmittance of three-dimensional objects with basic colors in the visible light region. Indicates the transmittance of air in the visible light region.

[0093] Specifically, the ratio of the total transmittance of the basic color of the cyan three-dimensional object to the total transmittance of the air is :

[0094]

[0095] In this embodiment, since the ideal color state of the 3D printing material is only reflected in the visible light region, the wavelength range of the visible light region is between 380nm and 700nm, then the starting point of the wavelength in the visible light region is 380nm, and the end point of the wavelength in the visible light region is 700nm.

[0096] The transparency of 3D printing materials refers to the effect of white light irradiated on the ink layer formed by the 3D printing materials on color rendering, which is divided into two parts. The first part is used to help produce color perception, and the second part is used to form a sense of transparency. The transparency characteristics of the material are described in a quantitative way, which is the transparency measurement index of the 3D printing material. The transmission spectrum of the 3D printing material is measured, and the transmission spectrum components formed by the white light irradiated on the ink layer after the superposition of the ink layer are analyzed to establish a relationship that can reflect the transparency measurement index of the ink (colorant). The first part of the white light is in the opposite color band, and most of the light is absorbed by the ink layer; most of the light in its basic color band is scattered on the surface of the ink layer to establish the color perception of the ink layer. The more reflected light in the basic color band, the higher the color saturation, and the weaker the light transmittance of the ink layer at this time; the second part of the white light is used as the transmitted light, and the whole visible light band is transmitted to the back of the ink layer. The greater the light transmission of the opposite color band of this part of the white light, the more conducive it is to the penetration of the reflected light of the other ink layer below it, which is manifested as a stronger light transmittance of the upper ink layer.

[0097] Therefore, the ratio of the second average transmittance of the opposite color band to the first average transmittance of the basic color band is used. As a representation of one of the properties of light transmittance related to the ink layer and hue; the ratio of the total transmittance of the basic color to the total transmittance of air is used The light transmission property of the ink layer is independent of the hue. These two properties together form the transparency of the 3D printing material, which is related to the ratio , There is a positive correlation.

[0098] In this embodiment, the transparency of the 3D printing material Formula (1).

[0099] In some specific embodiments, according to Figure 3a-3c The transparency T of the 3D printing material containing cyan colorant is calculated from the data. C =17.66, the transparency T of the 3D printing material containing magenta colorant M =37.39, the transparency T of the 3D printing material containing yellow pigment Y =10.75.

[0100] It can be seen that the transparency measurement method of the three-dimensional printing material provided by the present application can clearly indicate the transparency of the three-dimensional printing material of each basic color.

[0101] In other embodiments, the transparency of the 3D printing material is negatively correlated with the thickness of the 3D object. Since transparency is the ability of the 3D printing material to be transmitted by light and reveal the color of the covered surface, as the thickness of the 3D object increases, the ability of light to be transmitted and reveal the color of the covered surface decreases. Therefore, the thickness of the 3D object should be selected based on the transparency of the 3D printing material that can be measured. In some embodiments, the thickness of the 3D object is less than or equal to 2 mm, which is not limited here.

[0102] Based on the above Figure 2 In another embodiment, the method further comprises:

[0103] Step S5, judging whether the transparency relationship of different 3D printing materials is reasonable according to the transparency of the different 3D printing materials, wherein the basic color materials in the different 3D printing materials are different.

[0104] The transparency of three-dimensional printing materials with different basic colors can be obtained by referring to the aforementioned method for measuring the transparency of three-dimensional printing materials, which will not be described in detail here.

[0105] In this embodiment, the transparency values ​​of the three-dimensional printing materials with different basic colors are obtained and compared to determine whether the transparency of the three-dimensional printing materials with different basic colors is reasonable.

[0106] In a specific implementation, step S5 includes: when the absolute value of the difference in transparency between any two different three-dimensional printing materials is less than or equal to 5, the transparency relationship between the different three-dimensional printing materials is reasonable; when the absolute value of the difference in transparency between any two different three-dimensional printing materials is greater than 5, the transparency relationship between the different three-dimensional printing materials is unreasonable.

[0107] For example, T C =16.67, T M =27.00, T Y =13.04, the transparency of the three basic colors is judged to be unreasonable, and the transparency of the magenta 3D printing material should be adjusted to make its relationship with cyan and yellow reasonable.

[0108] Furthermore, the method further comprises:

[0109] When the transparency relationship of the different three-dimensional printing materials is unreasonable, the mass concentration of the basic color material in the three-dimensional printing material is adjusted to make the transparency relationship of the different three-dimensional printing materials reasonable.

[0110] For example, the mass concentration of the magenta colorant in the magenta 3D printing material can be adjusted from 8% to 10%, so that the transparency relationship between the magenta 3D printing material, the cyan 3D printing material, and the yellow 3D printing material is reasonable, thereby avoiding the problem that the color rendering effect of the ink colorant cannot be fully exerted due to the mismatch of the transparency of basic color colorants of different hues, resulting in defects in the color rendering range and unnatural color transition.

[0111] The present application provides a device for calculating the transparency of a three-dimensional printing material. Figure 4 As shown, the device comprises:

[0112] A first acquisition unit 10 is used to acquire a basic color three-dimensional object using a three-dimensional printing material to be measured, wherein the three-dimensional printing material used for the basic color three-dimensional object includes a basic color colorant;

[0113] A second acquisition unit 20 is used to measure a first transmission spectrum of the basic color three-dimensional object and a second transmission spectrum of air in the visible light region;

[0114] A first calculation unit 30 is used to obtain the total transmittance of the basic color, the first average transmittance of the basic color band, and the second average transmittance of the opposite color band based on the first transmission spectrum, and obtain the total transmittance of air based on the second transmission spectrum;

[0115] A second calculation unit 40 is used to calculate the ratio of the second average transmittance to the first average transmittance , calculate the ratio of the total transmittance of the basic color to the total transmittance of the air , obtain the transparency T of the three-dimensional printing material to be measured, Formula (1).

[0116] In this embodiment, the three-dimensional object is printed and formed using three-dimensional printing technology. In three-dimensional inkjet printing technology, the material used is usually liquid resin, and the coloring method is to mix the colorants to produce color. The three primary colors of the colorants are cyan (C), magenta (M), and yellow (Y). These three primary colors have the property that no matter what proportion two of them are mixed, the third primary color cannot be produced. The coloring of the colorants is subtractive color mixing, that is, each of their colors subtracts a certain one-third of monochromatic light from the composite white light, and reflects or transmits two-thirds of the colored light accordingly. It is customary to regard the primary color magenta of the colorant subtractive color method as subtracting green, yellow as subtracting blue, and cyan as subtracting red. Because each of the three primary colors of the subtractive color method is equivalent to the color after subtracting a spectral color light from white light, and this name can correspond to the names of the three primary colors of the additive color method.

[0117] In this embodiment, the basic color is also called the primary color, and the basic color is selected from at least one of cyan (C), magenta (M), and yellow (Y). Each basic color corresponds to an opposite color, and the opposite color is the color of white light minus a basic color light. The opposite color of cyan (C) is red (R), the opposite color of magenta (M) is green (G), and the opposite color of yellow (Y) is blue (B).

[0118] In some embodiments, the primary colorants include cyan, magenta, and yellow colorants.

[0119] The three-dimensional object is a three-dimensional model of a regular shape, and at least two dimensions of the three-dimensional object are greater than or equal to the measuring aperture of the measuring instrument. In some embodiments, the measuring aperture is 25 mm. The three-dimensional object can be at least one of a cuboid of 50 mm long × 50 mm wide × 0.3 mm thick, a cuboid of 50 mm long × 50 mm wide × 0.5 mm thick, a cuboid of 50 mm long × 50 mm wide × 0.7 mm thick, and a cuboid of 50 mm long × 50 mm wide × 1.0 mm thick.

[0120] In this embodiment, the second acquisition unit may be a spectrophotometer, the basic color three-dimensional object is a three-dimensional model of a regular shape, and at least two dimensions of the three-dimensional object are greater than or equal to the measurement aperture of the spectrophotometer.

[0121] In this embodiment, the transmission spectrum of the three-dimensional object is measured in the visible light region using a spectrophotometer. Specifically, the visible light region ranges from 380nm to 700nm, and the basic color three-dimensional object is the first transmission spectrum. Specifically, the transmission spectrum of the three-dimensional object (a cuboid with a length of 50mm, a width of 50mm, and a thickness of 0.5mm) is measured in the visible light region of 380nm to 700nm using an X-RiteColor i7 spectrophotometer with a LAV aperture of 25mm. In this embodiment, Figure 3a~Figure 3b As shown, it is the transmission spectrum diagram of the three-dimensional object model of each basic color.

[0122] In some embodiments, the second transmission spectrum of air is measured in the visible light region using a spectrophotometer.

[0123] In other embodiments, the first acquisition unit is also used to acquire a colorless and transparent standard three-dimensional object; the second acquisition unit is also used to measure the transmission spectrum of the standard three-dimensional object in the visible light region using a spectrophotometer, and regard the transmission spectrum of the standard three-dimensional object as the second transmission spectrum of air.

[0124] In this embodiment, the ratio of the second average transmittance to the first average transmittance is , calculated according to formula (2):

[0125] (2).

[0126] in, is the second average transmittance of the opposite color band, is the starting point of the opposite color band, is the end point of the opposite color band, is the transmittance of each wavelength in the opposite color band, is the number of wavelengths corresponding to the opposite color band; is the first average transmittance of the basic color band, is the starting point of the basic color band. is the end point of the basic color band, is the transmittance of each wavelength in the basic color band, is the number of wavelengths corresponding to the basic color band.

[0127] Furthermore, the ratio of the total transmittance of the basic color to the total transmittance of the air is Calculate according to formula (3):

[0128] (3),

[0129] in, is the starting point of the wavelength in the visible light region, is the end point of the wavelength in the visible light region, It represents the transmittance of three-dimensional objects with basic colors in the visible light region. Indicates the transmittance of air in the visible light region.

[0130] Furthermore, the measuring device further comprises: a judging unit 50, configured to judge whether the transparency relationship of different 3D printing materials is reasonable according to the transparency of the different 3D printing materials, wherein the basic color materials in the different 3D printing materials are different.

[0131] In a specific implementation, the judgment unit is used to: when the absolute value of the difference in transparency between any two different three-dimensional printing materials is less than or equal to 5, the transparency relationship between the different three-dimensional printing materials is reasonable; when the absolute value of the difference in transparency between any two different three-dimensional printing materials is greater than 5, the transparency relationship between the different three-dimensional printing materials is unreasonable.

[0132] For example, T C =16.67, T M =27.00, T Y =13.04, the transparency of the three basic colors is judged to be unreasonable, and the transparency of the magenta 3D printing material should be adjusted to make its relationship with cyan and yellow reasonable.

[0133] Furthermore, the device further comprises: an adjusting unit for adjusting the mass concentration of the basic colorant in the 3D printing material when the transparency relationship of the different 3D printing materials is unreasonable, so as to make the transparency relationship of the different 3D printing materials reasonable.

[0134] For example, the mass concentration of the magenta colorant in the magenta 3D printing material can be adjusted from 8% to 10%, so that the transparency relationship between the magenta 3D printing material, the cyan 3D printing material, and the yellow 3D printing material is reasonable, thereby avoiding the problem that the color rendering effect of the ink colorant cannot be fully exerted due to the mismatch of the transparency of basic color colorants of different hues, resulting in defects in the color rendering range and unnatural color transition.

[0135] It should be noted that the transparency measuring device for three-dimensional printed materials in the present application may be an integrated device or a plurality of separate devices, wherein the plurality of separate devices perform different functions.

[0136] The embodiment of the present application also provides a computer non-volatile storage medium, the storage medium includes a stored program, and when the program is executed, the device where the storage medium is located is controlled to execute the above-mentioned method for measuring the transparency of three-dimensional printing materials. As described above, it will not be repeated here.

[0137] The present application also provides a computer device, such as Figure 5 As shown, the computer device 100 of this embodiment includes: a processor 101, a memory 102, and a computer program 103 stored in the memory 102 and executable on the processor 101. When the processor 101 executes the computer program 103, the method for measuring the transparency of the three-dimensional printing material in the embodiment is implemented. To avoid repetition, they are not described one by one here.

[0138] It should be noted that the computer device 100 may be a computing device such as a desktop computer, a notebook, a PDA, a cloud server, etc. The computer device may include, but is not limited to, a processor 101 and a memory 102. Those skilled in the art will understand that Figure 5 This is only an example of the computer device 100 and does not constitute a limitation of the computer device 100. The computer device 100 may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, the computer device may also include input and output devices, network access devices, buses, etc.

[0139] The processor 101 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc.

[0140] The memory 102 may be an internal storage unit of the computer device 100, such as a hard disk or memory of the computer device 100. The memory 102 may also be an external storage device of the computer device 100, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the computer device 100. Further, the memory 102 may also include both an internal storage unit of the computer device 100 and an external storage device. The memory 102 is used to store computer programs and other programs and data required by the computer device. The memory 102 may also be used to temporarily store data that has been output or is to be output.

[0141] The present application also provides a three-dimensional printing material transparency measurement system. Figure 6 As shown, the transparency measurement system 200 of a three-dimensional printed material includes a detection component 201, a processor 202, a memory 203, and a computer program stored in the memory 203 and executable on the processor. The detection component 201 is used to measure the transmission spectrum of a three-dimensional object in the visible light region, and may be, for example, an X-Rite Color i7 spectrophotometer. When the processor 202 executes the computer program, the transparency calculation formula in the three-dimensional printed material transparency measurement method described in the embodiment is implemented. That is, the computer program includes the transparency calculation formula, so that the transparency value of the three-dimensional printed material can be calculated.

[0142] In this embodiment, the transparency calculation formula is as shown in the embodiment and will not be repeated here.

[0143] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A method for measuring transparency of 3D printing materials, characterized in that: The method comprises the following steps: Acquire a basic color three-dimensional object using the three-dimensional printing material to be measured, wherein the three-dimensional printing material used for the basic color three-dimensional object includes a basic color material; Measuring a first transmission spectrum of the three-dimensional object with the basic color and a second transmission spectrum of air in the visible light region; Based on the first transmission spectrum, obtain the total transmittance of the basic color, the first average transmittance of the basic color band, and the second average transmittance of the opposite color band; based on the second transmission spectrum, obtain the total transmittance of air; Calculate the ratio of the second average transmittance to the first average transmittance , calculate the ratio of the total transmittance of the basic color to the total transmittance of the air , obtain the transparency T of the three-dimensional printing material to be measured, Formula (1).

2. The method according to claim 1, characterized in that The second average transmittance of the opposite color band = ,in, is the starting point of the opposite color band, is the end point of the opposite color band, is the transmittance of each wavelength in the opposite color band, is the number of wavelengths corresponding to the opposite color bands.

3. The method according to claim 2, characterized in that The first average transmittance of the basic color band = ,in, is the starting point of the basic color band. is the end point of the basic color band, is the transmittance of each wavelength in the basic color band, is the number of wavelengths corresponding to the basic color band.

4. The method according to claim 3, characterized in that The ratio of the second average transmittance to the first average transmittance , calculated according to formula (2): （2）。 5. The method according to claim 1, characterized in that The ratio of the total transmittance of the basic color to the total transmittance of the air , calculated according to formula (3): （3）； in, is the starting point of the wavelength in the visible light region, is the end point of the wavelength in the visible light region, It represents the transmittance of three-dimensional objects with basic colors in the visible light region. Indicates the transmittance of air in the visible light region.

6. The method according to claim 1, characterized in that The basic color three-dimensional object is a three-dimensional model with a regular shape.

7. The method according to claim 1, characterized in that A first transmission spectrum of the three-dimensional object with the basic color and a second transmission spectrum of air are measured in the visible light region by using a spectrophotometer; wherein at least two dimensions of the three-dimensional object are greater than or equal to the measurement aperture of the spectrophotometer.

8. The method according to claim 1, characterized in that The method further comprises: Whether the transparency relationship of the different three-dimensional printing materials is reasonable is judged according to the transparency of the different three-dimensional printing materials, wherein the basic color materials in the different three-dimensional printing materials are different.

9. The method according to claim 8, characterized in that The method further comprises: When the transparency relationship of the different three-dimensional printing materials is unreasonable, the mass concentration of the basic color material in the three-dimensional printing material is adjusted to make the transparency relationship of the different three-dimensional printing materials reasonable.

10. The method according to claim 8, characterized in that The method further comprises: When the absolute value of the difference between the translucency of any two different three-dimensional printing materials is less than or equal to 5, the translucency relationship between the different three-dimensional printing materials is reasonable.

11. A transparency measuring device for three-dimensional printing materials, characterized in that: The device comprises: A first acquisition unit is used to acquire a basic color three-dimensional object using a three-dimensional printing material to be measured, wherein the three-dimensional printing material used by the basic color three-dimensional object includes a basic color colorant; A second acquisition unit is used to measure a first transmission spectrum of the basic color three-dimensional object and a second transmission spectrum of air in the visible light region; a first calculation unit, configured to obtain a total transmittance of a basic color, a first average transmittance of a basic color band, and a second average transmittance of an opposite color band based on the first transmission spectrum, and obtain a total transmittance of air based on the second transmission spectrum; A second calculation unit, configured to calculate a ratio of the second average transmittance to the first average transmittance , calculate the ratio of the total transmittance of the basic color to the total transmittance of the air , obtain the transparency T of the three-dimensional printing material to be measured, Formula (1).

12. The device according to claim 11, characterized in that The second average transmittance of the opposite color band = ,in, is the starting point of the opposite color band, is the end point of the opposite color band, is the transmittance of each wavelength in the opposite color band, is the number of wavelengths corresponding to the opposite color bands.

13. The device according to claim 12, characterized in that The first average transmittance of the basic color band = ,in, is the starting point of the basic color band. is the end point of the basic color band, is the transmittance of each wavelength in the basic color band, is the number of wavelengths corresponding to the basic color band.

14. The device according to claim 13, characterized in that The ratio of the second average transmittance to the first average transmittance , calculated according to formula (2): （2）。 15. The device according to claim 11, characterized in that The ratio of the total transmittance of the basic color to the total transmittance of the air , calculated according to formula (3): （3）； Among them, among them, is the starting point of the wavelength in the visible light region, is the end point of the wavelength in the visible light region, It represents the transmittance of three-dimensional objects with basic colors in the visible light region. Indicates the transmittance of air in the visible light region.

16. The device according to claim 11, characterized in that A three-dimensional model of a regular shape of the basic color three-dimensional object.

17. The device according to claim 11, characterized in that The second acquisition unit is a spectrophotometer, and at least two dimensions of the three-dimensional object are greater than or equal to a measurement aperture of the spectrophotometer.

18. The device according to claim 11, characterized in that The device also includes: The judging unit is used to judge whether the transparency relationship of different 3D printing materials is reasonable according to the transparency of the different 3D printing materials, wherein the basic color materials in the different 3D printing materials are different.

19. A computer non-volatile storage medium, characterized in that: The storage medium includes a stored program, and when the program is executed, the device where the storage medium is located is controlled to execute the method for measuring transparency of three-dimensional printing materials according to any one of claims 1 to 10.

20. A computer device, characterized in that: The method comprises a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the method for measuring transparency of a three-dimensional printing material according to any one of claims 1 to 10 when executing the computer program.

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