JP5842670B2 - Photocuring resin curing monitoring method, curing monitoring apparatus, and curing monitoring program - Google Patents

Description

  The present invention relates to a photocuring resin curing monitoring method, a curing monitoring device, and a curing monitoring program.

  In recent years, in many industrial fields, as a curing method for a resin or a coating agent containing a resin as a main component, a photocuring method for curing by irradiating ultraviolet rays is used. Compared to thermal curing methods that use thermal energy, this curing method has many advantages, such as no harmful substances being released into the atmosphere, short curing time, and adaptability to heat-sensitive products. Because. In this curing method, a photo-curing resin that is mainly liquid before irradiation with ultraviolet rays but changes to a solid after irradiation with ultraviolet rays is used. Such a resin contains a photopolymerization initiator in addition to the main agent. The photopolymerization initiator generates radicals and cations upon receiving irradiated ultraviolet rays, and the generated radicals and cations cause a polymerization reaction with the main agent. Along with the polymerization reaction, the resin changes to a solid. Accordingly, the degree of curing of the photo-curing resin is determined according to the degree of polymerization.

  With a photo-curing resin, it is difficult to visually determine the degree of curing, and a method for easily determining the state of the resin accompanying curing is desired.

  For example, a method for estimating the cured state of a resin by detecting the intensity of fluorescence emitted from a photopolymerization initiator when the resin receives light (ultraviolet rays) is known (see, for example, Patent Document 1). ).

  As another method, a method is known in which the degree of cure is determined by utilizing the property that when the photocurable resin is irradiated with excitation light, the degree of polarization of the generated fluorescence increases as curing proceeds (for example, patents). Reference 2).

Japanese Patent No. 4185939 JP 6-10655

  In a known method for estimating the cured state based on the intensity of the fluorescence generated from the cured resin, the intensity of the fluorescence depends on the thickness of the photocurable resin, and it is difficult to accurately obtain the degree of cure of the adhesive. Moreover, the well-known curing degree determination method using the degree of polarization only obtains the curing degree at one point on the adhesion surface, and cannot estimate the curing strength of the adhesion surface.

  Therefore, an object of the present invention is to provide a method and an apparatus for realizing the determination of the completion of curing by estimating the curing strength of the adhesive surface by acquiring the degree of curing of the photo-curing resin as a two-dimensional distribution.

In the first aspect, the curing monitoring method for the photo-curing resin comprises:
Irradiate the photo-curing resin with light,
Acquire a two-dimensional image of fluorescence emitted from the photocurable resin,
Calculate the degree of cure for each pixel of the two-dimensional image,
Deriving a cure degree distribution of a cure degree exceeding a predetermined threshold from the calculated cure degree,
It is determined whether curing of the photo-curing resin is completed based on the curing degree distribution.

In the second aspect, the curing monitoring device comprises:
A light source for irradiating light to the photocurable resin;
An imaging unit for acquiring a two-dimensional image of fluorescence emitted from the photo-curable resin;
The degree of cure of the photocurable resin is calculated from the two-dimensional image, a degree of cure distribution exceeding a predetermined threshold is derived from the calculated degree of cure, and the photocurable resin is cured based on the degree of cure distribution. An information processing unit for determining whether or not it is completed;
Is provided.

  It is possible to determine the completion of curing based on the two-dimensional distribution of the degree of curing of the photo-curing resin.

It is a schematic block diagram of the hardening monitoring apparatus of one Embodiment. It is a flowchart which shows the outline | summary of the hardening degree determination process performed in the information processing part of FIG. It is a flowchart which shows the detail of the polarization degree distribution acquisition process of FIG. It is a flowchart which shows an example of the completion determination of hardening of FIG. It is a flowchart which shows an example of the completion determination of hardening of FIG. It is a flowchart which shows an example of the completion determination of hardening of FIG. It is a figure which shows the two-dimensional distribution of the hardness of the apply | coated photocurable resin. FIG. 3 is a diagram illustrating a determination flow in consideration of the curing center of gravity as an example of the determination of the completion of curing in FIG. 2. It is a schematic diagram for demonstrating the shift | offset | difference of a hardening gravity center and the center of an adhesion surface. FIG. 3 is a diagram illustrating a determination flow in consideration of a bias in curing as an example of the determination of the completion of curing in FIG. 2. It is a schematic diagram for demonstrating the bias | inclination of the hardening direction in an adhesive surface.

  In the embodiment, a method and configuration of curing monitoring based on a two-dimensional distribution of the degree of curing of the photo-curing resin is proposed. FIG. 1 is a schematic configuration diagram of a photocuring resin curing monitoring apparatus 1 according to the embodiment. In this embodiment, the degree of cure is monitored using the degree of polarization of fluorescence from the resin.

  The curing monitoring device 1 includes a stage 30 that holds a photo-curing resin 40, a light source 2 that irradiates light to the photo-curing resin 40, a polarization imaging unit 10 that acquires a fluorescence image from the photo-curing resin, and a polarization imaging unit 10. The information processing part 20 which processes the image information obtained by (3) and determines the curing degree is included. The information processing unit 20 calculates a two-dimensional distribution of the degree of curing from the image information and determines whether the curing is completed.

  The light from the light source 2 is irradiated onto the photocurable resin 40 by the optical system, and the fluorescence is guided to the polarization imaging unit 10. The optical system includes an excitation filter 3, a polarizer 4, a dichroic mirror 5, an objective lens 6, and a fluorescence observation filter 7. The light emitted from the light source 2 passes through the excitation filter 3 and is linearly polarized by the polarizer 4. The linearly polarized excitation light is reflected by the dichroic mirror 5 and applied to the photocurable resin 40 via the objective lens 6.

  The numerical aperture of the objective lens 6 is appropriately selected so that the spot diameter of the light irradiated on the photocurable resin 40 is a size that covers the entire photocured resin 40 applied. For example, when the photocurable resin 40 is used for assembling an optical component such as an optical communication device, the diameter of the application surface of the photocurable resin 40 is set to about 1 mm to 10 mm. By irradiation with excitation light, the photocurable resin 40 starts photopolymerization (curing) and emits fluorescence. Since the wavelength of the fluorescence is different from the wavelength of the excitation light, it passes through the dichroic mirror 5 and enters the polarization imaging unit 10.

  The polarization imaging unit 10 includes an analyzer 11, an imaging lens 12, and a camera 13. The direction of the transmission axis of the analyzer 11 is rotationally controlled by the information processing unit 20. The rotation control of the analyzer 11 will be described later in connection with the acquisition of the degree of polarization. Light incident on each pixel of the camera 13 via the imaging lens 12 is converted into electric charges.

  The information processing unit 20 includes an image input / processing unit 21, a rotation control unit 22, a curing degree acquisition unit 23, a curing completion determination unit 24, and a light amount control unit 25. The output of the rotation control unit 22 is connected to the analyzer 11 of the polarization imaging unit 10.

  In the curing monitoring device 1, the polarizer 4 is fixed, and the direction of linearly polarized light is determined to be a fixed direction. On the other hand, the relative angle of the analyzer 11 with respect to the polarizer 4 is controlled to rotate alternately between 0 degree and 90 degrees. For example, first, the camera 13 performs exposure in a state where the relative angle between the analyzer 4 and the analyzer 11 is 0 degree (parallel). The image input / processing unit 21 converts the fluorescence image captured by the camera 13 into an image Ip (t, x, y in a parallel Nicol state (the relative angle between the polarizer 4 and the analyzer 11 is 0 degree) at the timing t. ).

  Next, the rotation control unit 22 rotates the analyzer 11 and sets the relative angle between the polarizer 4 and the analyzer 11 to 90 degrees. The camera 13 starts exposure again. The image input / processing unit 21 converts the fluorescence image captured by the camera 13 into an image Ic (t, x, y) in the orthogonal Nicol state (the relative angle between the polarizer 4 and the analyzer 11 is 90 degrees) at the timing t. ). Actually, there is a slight time difference between the image acquisition in the parallel Nicol state and the image acquisition in the orthogonal Nicol state, but the image data in the parallel Nicol state and the image data in the orthogonal Nicol state are at timing t. Acquire and save as a set of data.

  As described above, the irradiation spot diameter on the photo-curing resin 40 is set to a size that covers the entire application surface of the UV-curing resin 40, but the degree of curing progressing uniformly within the photo-curing resin 40 ( Is not necessarily isotropic). Therefore, the degree of polarization for each pixel is acquired to obtain two-dimensional distribution data of the degree of polarization. Since there is a correlation between the degree of polarization and the degree of curing, the degree of progress of curing can be grasped two-dimensionally by obtaining a two-dimensional distribution of the degree of polarization.

  When a pair of images in the parallel Nicols state and the orthogonal Nicols state is stored, the curing degree acquisition unit 23 performs an operation for each pixel based on Expression (1) representing the degree of polarization, and polarization at the timing t. Obtain a two-dimensional distribution of degree ρ (t, x, y).

Depending on the correlation between the degree of polarization and the degree of resin curing, the degree of polarization ρ (x, y) can be replaced with the degree of curing α (x, y). Both the degree of polarization ρ and the degree of cure α can be represented by values between 0 and 1.

  The curing completion determination unit 24 determines whether the curing is completed based on the obtained two-dimensional distribution of the degree of curing. The criteria will be described later with reference to FIGS. When it is determined that the curing has been completed, the light source 2 is turned off via the light quantity control unit 25, and the measurement ends. When it is determined that the curing has not been completed, a set of imaging data of the parallel Nicol state and the orthogonal Nicol state is acquired from the fluorescence at the next timing t1, and the curing degree (polarization degree) based on Equation (1). To determine the completion of curing.

  Based on the determination result of the curing completion determination unit 24, the light amount control unit 25 can perform not only simple on / off control of the light source but also processing for increasing or decreasing the light amount of the light source 2. For example, when the two-dimensional distribution of the degree of curing approaches a value that is a reference for completion of curing, it is possible to control to reduce the amount of irradiation light. In addition, it is possible to control the light amount independently of the determination of the completion of curing, for example, to change the light amount based on the irradiation time.

  According to the curing monitoring device 1 of FIG. 1, it is possible to determine the completion of curing of the photo-curing resin in a non-contact and in-line manner. Further, even when the thickness of the applied photo-curing resin is not known, it is possible to appropriately determine the completion of curing from the two-dimensional distribution of the cured state.

  FIG. 2 is a diagram showing a basic flow of a curing monitoring method using the apparatus of FIG. First, in step S21, light is irradiated to the photocuring resin to be monitored, and the degree of polarization of fluorescence from the resin is detected at the current timing (t). The detection of the degree of polarization includes two-dimensional imaging of fluorescence emitted from the resin and calculation of the degree of polarization at each pixel p (x, y).

  Next, in step S23, a two-dimensional distribution α (x, y) of the curing degree of the photo-curing resin is derived based on the acquired polarization degree distribution. Since there is a correlation between the degree of polarization and curing, the distribution of the degree of polarization obtained in step S21 may be used as it is as the degree of curing α (x, y).

  Next, in step S24, it is determined whether or not the curing of the photo-curing resin is completed based on the derived curing degree distribution (S24). Since the curing of the resin proceeds as the light irradiation time elapses, the polarization degree detection operation in S21 and the derivation of the cure degree distribution in S23 are repeated until it is determined that the cure is completed (calculation of the polarization degree distribution and the cure degree distribution). May be integrally performed). If it is determined that the curing is complete, the light irradiation is terminated.

  FIG. 3 is a flowchart showing a specific method of S21 (polarization degree detection operation) and S23 (derivation of curing degree distribution) of FIG. In step S31, the analyzer 11 of FIG. 1 is rotated so that the relative angle to the polarizer 4 becomes 0 degrees (so that the transmission axis of the analyzer 11 is parallel to the direction of linearly polarized light). In step S32, the camera 13 captures (exposes) a fluorescence image Ip (x, y) when the relationship between the analyzer 11 and the polarizer 4 is parallel. In step S33, the angle of the analyzer 11 is switched. In other words, the rotation controller 22 rotates the analyzer 11 so that the relative angle of the analyzer 11 with respect to the polarizer 4 is 90 degrees. In step S34, an image Ic (x, y) when the relationship between the analyzer 11 and the polarizer 4 is vertical is imaged (exposed). In step S35, the relative angle of the analyzer 11 with respect to the polarizer 4 is set to 0 degree again for image acquisition at the next timing. At the same time, in step S36, the degree of fluorescence polarization ρ at the current timing is calculated.

The degree of polarization is calculated for each pixel. The degree of polarization is the intensity Ip (x _i , y _i ) when the relationship between the analyzer 11 and the polarizer 4 is parallel, and the intensity Ic (x _i , y when the relationship between the analyzer 11 and the polarizer 4 is vertical. _i ) can be obtained by the above equation (1). By calculating the degree of polarization of all the pixels, a two-dimensional distribution of the degree of polarization can be obtained. Since there is a correlation between the degree of polarization of fluorescence and the degree of cure of the resin, the determination of completion of curing (S24) may be performed using the value of the degree of polarization ρ as the degree of cure as it is.

  If it is determined in step S24 that the curing has been completed, the light irradiation is terminated and the monitoring is terminated. When the curing is not completed, the parallel image Ip (xi, yi) and the vertical image Ic (xi, yi) of each pixel are acquired at the next timing, and the polarization distribution is calculated. This is repeated until it is determined that curing is complete.

  Next, how to determine the completion of curing will be described with reference to FIGS. In the example of FIG. 4, the determination is made using the minimum value in the two-dimensional distribution of the degree of cure. The operation for detecting the degree of polarization (S21) and the derivation of the degree of curing (S23) are as described with reference to FIGS.

In step S44, the minimum value min (α (x, y)) is extracted from the acquired two-dimensional distribution of the degree of cure. In step S45, the minimum value min (α (x, y) ) of the degree of cure is determined whether exceeds a predetermined threshold value alpha _0. If the threshold is exceeded alpha ₀ in S44, the whole of the applied light curable resin is determined to be cured, and ends the irradiation. This is because if the degree of cure at the slowest point of cure exceeds a certain value, it can generally be estimated that the entire resin has been cured.

In the example of FIG. 5, the completion of the curing is determined using the average value avg (α (x, y)) of the curing degree. That is, the average value of the degree of cure α (xi, yi) obtained for each pixel in S54 is calculated. Average value S55 is be determined whether exceeds a predetermined threshold value alpha _0. When the threshold value α ₀ is exceeded, it is determined that the entire resin has been cured, and the light irradiation is terminated. Note that determination using the mode value or the median value may be performed instead of the average value of all pixels.

  In the example of FIG. 6, the completion of curing is determined using dispersion. Even when the minimum curing degree exceeds the threshold value in FIG. 4, when the variation in the curing degree is large in the resin application surface, the curing strength becomes discontinuous and stress is concentrated on a part. In this case, the adhesive (cured resin) may be peeled off and the optical component may be detached. The same applies to the case where the average degree of curing exceeds the threshold value in FIG. Therefore, in order to make the strength of the adhesive layer uniform, the dispersion of the hardness is suppressed to less than a certain value.

S21, S23, S44, and S45 in FIG. 6 are the same as the steps in FIG. In Figure 6, the minimum degree of curing min (x, y) in S45 if it is determined to exceed the threshold value alpha _0, to calculate the variance sigma ² from the two-dimensional distribution of the degree of cure proceeds to S66. In S67, it is determined whether or not the calculated variance is smaller than a predetermined threshold σ _o ² (σ ² <σ _o ² ). If it is determined that the variance has converged to a range smaller than the threshold σ _o ² (YES in S67), the irradiation is terminated. If not converged within the threshold (NO in S67), the processes of S21, S23, S44, S45, S66, and S67 are repeated until the variance becomes smaller than the threshold. Thereby, the uniform hardening of the photocurable resin 40 can be realized. Note that the processing of S54 and S55 in FIG. 5 may be performed instead of S45 and S45.

  FIG. 7 is a diagram showing a two-dimensional image of the curing degree distribution. As described above, the progress of curing of the photo-curing resin is not necessarily uniform or isotropic. In FIG. 7A, the centroid (curing centroid) of the curing degree distribution is shifted from the center of the adhesive surface of the applied resin. FIG. 7B shows a state where the center of gravity of the curing degree distribution substantially coincides with the center of the adhesive surface, but is biased in the progressing direction of curing. It can be seen that curing proceeds in only one direction. FIG. 7C shows an example of good curing. An example is shown in which the deviation between the center of gravity of the degree of curing distribution and the center of the adhesive surface is small, and the curing progresses uniformly (isometrically) as a whole.

  Even when the average value clears the criteria for determining the curing in S55 of FIG. 5, the center of gravity of the curing degree distribution is shifted as shown in FIG. 7A, or the progress of curing as shown in FIG. 7B. In a state where the direction is biased, the adhesive state of the optical component becomes unstable. Therefore, a more stable curing judgment is provided.

FIG. 8 and FIG. 9 are diagrams showing a determination method in consideration of the deviation of the center of gravity of the curing degree distribution corresponding to the state of FIG. S21, S23, S54, and S55 in FIG. 8 are the same as those in FIG. If it is determined in step S55 of FIG. 8 that the average value avg (α (x, y)) of the degree of cure exceeds the threshold value α ₀ , the process proceeds to S76, where the pixel value β of the cured resin application surface (adhesion surface) is reached. Get (x, y). In S77, the center of gravity (curing center of gravity) Gα of the curing degree distribution and the center Gβ of the adhesive surface are calculated. In S78, the center-of-gravity deviation ε is calculated from the value of the curing center of gravity Gα and the value of the center Gβ of the adhesive surface. In S79, it is determined whether or not the center-of-gravity shift ε is smaller than a predetermined threshold value. When the deviation of the center of gravity is smaller than the threshold value, the curing is completed. When the deviation of the center of gravity is greater than or equal to the threshold value, S21, S23, S54, S55, and S76 to S78 are repeated until the deviation is less than the threshold value.

  FIG. 9 is a schematic diagram for explaining the deviation between the center of gravity of the degree of cure distribution of FIG. 8 and the center of the adhesive surface. In FIG. 9A, the range of the adhesive surface of the photocurable resin 40 can be obtained from the two-dimensional fluorescent image of the camera 13. The center Gβ of the adhesion surface is calculated based on the pixel coordinate values. In FIG. 9B, the center of gravity Gα of the curing degree distribution is calculated. In this case, the center of gravity may be calculated from the degree of polarization or the degree of cure in all pixels, or the center of gravity Gα of the degree of cure distribution may be calculated within the range of the cure distribution f (x, y) having a degree of cure greater than or equal to the threshold. Also good. As shown in FIG. 9C, the amount of deviation ε from the center Gβ of the adhesion surface of the center of gravity Gα of the curing degree distribution is calculated. The shift amount ε may be expressed by the distance between the coordinates of the center of gravity Gα of the curing degree distribution and the adhesive surface center Gβ.

  By performing the center-of-gravity shift determination as shown in FIGS. 8 and 9, the adhesion of the optical components can be made more stable. In the example of FIG. 8, the deviation of the center of gravity Gα of the curing degree distribution is determined when the curing average avg (α (x, y)) is exceeded, but it exceeds the minimum curing degree min (α (x, y)). The center of gravity deviation may be determined when Alternatively, a median value or mode value of the degree of cure may be used instead of the cure average.

FIG. 10 and FIG. 11 are diagrams showing a determination method in consideration of the deviation of the curing direction corresponding to the state of FIG. S21, S23, S54, S55, and S76 to S79 in FIG. 10 are the same as the processing in FIG. In FIG. 10, when it is determined in S79 that the deviation amount ε of the centroid Gα of the curing degree distribution is smaller than the predetermined value ε ₀ (ε <ε ₀ ), the process proceeds to step S81, and the curing distribution f (x , Y), and inertia moments Ixx, Iyy, Ixy are calculated. In S82, the principal axis length a and the minor axis length b of the inertia ellipsoid are calculated from the secondary moments Ixx, Iyy, and Ixy. In S83, the length-to-short ratio (γ = a / b) of the principal axis and the minor axis of the inertia ellipse is obtained. In S84, it is determined whether the long / short ratio γ is sufficiently close to 1. This will be described with reference to FIG.

  As shown in FIG. 11A, even if the center of gravity Gα of the curing distribution f (x, y) having a degree of curing equal to or greater than the threshold substantially coincides with the center Gβ of the adhesive surface, an inertia ellipsoid (approximate) of the degree of curing distribution is obtained. If there is a difference between the main shaft length a and the sub shaft length b, it means that the curing direction is biased. As the curing proceeds, the curing direction becomes uniform as shown in FIG. The closer the inertia ellipse is to a circle, that is, the closer the length ratio r (= a / b) of the principal axis and the minor axis of inertia approaches 1, the more uniform the state of curing.

  Therefore, first, the second moment of the inertial inertial body of the curing distribution f (x, y) is calculated according to the equations (2-1) to (2-3) (S81).

Next, the principal axis length a and the minor axis length b of the inertia ellipsoid are obtained from the second moment according to the equations (3-1) and (3-2) (S82).

The long / short ratio γ is obtained from the obtained values of a and b (S83). It is determined whether the value of the long / short ratio γ is close to 1. If | γ−1 | <δ holds for a sufficiently small value δ, it is determined that curing is complete (S84).

  Thus, the adhesive strength can be stabilized by using the deviation between the center of gravity of the curing degree distribution and the center of the adhesive surface for the determination of the completion of curing. In addition, by using the length ratio obtained from the ellipse approximation of the curing degree distribution to determine the completion of curing, it is possible to shift the curing degree distribution from an elliptical shape to a circular shape, and to suppress spatial deviation in the direction of curing progress. it can. As a result, the adhesive strength can be increased.

  As described above, the curing monitoring method using the degree of polarization of fluorescence from the photo-curing resin has been described, but this is an example, and when the photo-curing resin can be applied with a uniform thickness, the two-dimensional distribution of the degree of polarization Alternatively, a two-dimensional distribution of fluorescence intensity may be used. In this case, the hardness is estimated from the correlation with the fluorescence intensity. The polarizer 4 and the analyzer 11 are not necessary. Alternatively, a two-dimensional distribution of changes in the Raman spectrum due to curing may be acquired by irradiating infrared rays. In this case, a Raman spectrometer and a Fourier transform unit are necessary. In any case, the deviation of the center of gravity of the hardness distribution or the length-to-short ratio of the inertia ellipsoid from the two-dimensional distribution of hardness can be used to determine the completion of curing.

  8 and 10, the center-of-gravity deviation is determined when the average hardness of all pixels exceeds a predetermined threshold, but the average value calculation is omitted, and the curing exceeds the predetermined value. The center-of-gravity shift may be determined based on the curing degree distribution f (x, y) of the pixels indicating the degree, or the threshold value when the ratio of the pixels exhibiting the degree of curing exceeding a certain threshold value is equal to or greater than a certain value. The center-of-gravity shift may be determined based on a two-dimensional distribution of the degree of curing exceeding.

  In addition, the operation of the information processing unit 20 of the curing monitoring device may be performed by executing a curing monitoring program stored in a memory (not shown). In this case, the curing monitoring program includes at least (a) a process of receiving a two-dimensional image of fluorescence emitted from the photo-curing resin 40 and (b) a degree of curing for each pixel of the two-dimensional image. (C) a step of obtaining a curing degree distribution having a degree of curing exceeding a predetermined threshold from the calculated degree of curing, and (d) the photocurable resin 40 based on the degree of curing distribution exceeding the predetermined threshold. And determining whether or not curing is complete. The flow of FIG. 8 or the flow of FIG. 10 may be executed.

The following notes are presented for the above explanation.
(Appendix 1)
Irradiate the photo-curing resin with light,
Acquire a two-dimensional image of fluorescence emitted from the photocurable resin,
Calculate the degree of cure for each pixel of the two-dimensional image,
Deriving a cure degree distribution of a cure degree exceeding a predetermined threshold from the calculated cure degree,
It is judged whether hardening of the said photocurable resin was completed based on the said curing degree distribution. The hardening monitoring method of the photocurable resin characterized by the above-mentioned.
(Appendix 2)
The center of gravity of the curing degree distribution and the center of the adhesive surface of the photo-curing resin are calculated, and the difference between the center of gravity of the curing degree distribution and the center of the adhesive surface is smaller than a first predetermined value. The curing monitoring method according to supplementary note 1, wherein the curing monitoring method is determined to be completed.
(Appendix 3)
When the deviation between the center of gravity of the degree of hardening distribution and the center of the adhesive surface is smaller than the first predetermined value, the inertia ellipse of the degree of hardening distribution is approximated, and the length ratio of the principal axis and the minor axis of the inertia ellipse It is determined whether or not the absolute value of the difference between 1 and 1 is smaller than a second predetermined value, and when the absolute value of the difference is smaller than the second predetermined value, it is determined that the curing has been completed. The curing monitoring method according to supplementary note 2, characterized in that:
(Appendix 4)
The curing monitoring method according to appendix 1, wherein it is determined that the curing is completed when the dispersion of the curing degree distribution is smaller than a third predetermined value.
(Appendix 5)
The curing monitoring method according to any one of appendices 1 to 4, wherein the calculation of the degree of curing for each pixel uses the degree of polarization of the fluorescence calculated for each pixel.
(Appendix 6)
The curing degree distribution is acquired by determining whether at least one of a minimum value, an average value, a median value, and a mode value of the two-dimensional distribution of the curing degree exceeds the predetermined threshold value. Curing monitoring method.
(Appendix 7)
A light source for irradiating light to the photocurable resin;
An imaging unit for acquiring a two-dimensional image of fluorescence emitted from the photo-curable resin;
The degree of cure of the photocurable resin is calculated from the two-dimensional image, a degree of cure distribution exceeding a predetermined threshold is derived from the calculated degree of cure, and the photocurable resin is cured based on the degree of cure distribution. An information processing unit for determining whether or not it is completed;
Curing monitoring device with
(Appendix 8)
The information processing unit
The center of gravity of the curing degree distribution and the center of the adhesive surface of the photo-curing resin are calculated, and the difference between the center of gravity of the curing degree distribution and the center of the adhesive surface is smaller than a first predetermined value. A determination unit that determines that is completed,
The curing monitoring device according to appendix 7, characterized by comprising:
(Appendix 9)
The determination unit
When the deviation between the center of gravity of the degree of hardening distribution and the center of the adhesive surface is smaller than the first predetermined value, the inertia ellipse of the degree of hardening distribution is approximated, and the length ratio of the principal axis and the minor axis of the inertia ellipse It is determined whether or not the absolute value of the difference between 1 and 1 is smaller than a second predetermined value, and when the absolute value of the difference is smaller than the second predetermined value, it is determined that the curing has been completed. The curing monitoring device according to supplementary note 8, wherein
(Appendix 10)
The curing information monitoring method according to appendix 7, wherein the information processing unit determines that the curing is completed when a dispersion of the curing degree distribution is smaller than a third predetermined value.
(Appendix 11)
Any one of appendices 7 to 10, wherein the information processing unit calculates the degree of polarization of the fluorescence for each pixel of the two-dimensional image, and calculates the degree of curing for each pixel based on the degree of polarization. The curing monitoring device according to claim 1.
(Appendix 12)
A polarizer fixed between the light source and the photocurable resin;
An analyzer disposed between the photocurable resin and the imaging unit;
Further comprising
The information processing unit further includes a rotation control unit that switches a relative angle of the analyzer with respect to the polarizer between a first angle and a second angle;
The curing monitoring apparatus according to appendix 11, wherein a degree of polarization for each pixel is calculated based on the fluorescence intensity acquired at the first angle and the fluorescence intensity acquired at the second angle.
(Appendix 13)
Machine-readable cure monitoring program stored in memory and causing an information processing device to perform at least the following steps:
Receiving a two-dimensional image of fluorescence emitted from the photocurable resin;
Calculating a curing degree for each pixel of the two-dimensional image;
A step of deriving a curing degree distribution having a degree of curing exceeding a predetermined threshold from the calculated degree of curing; and a step of determining whether or not curing of the photocurable resin is completed based on the curing degree distribution.

  The present invention can be applied to non-contact measurement and monitoring of the degree of cure of an optical adhesive used for assembling optical components.

DESCRIPTION OF SYMBOLS 1 Photocuring resin hardening monitoring apparatus 2 Light source 3 Excitation filter 4 Polarizer 10 Polarization imaging part 11 Analyzer 12 Imaging lens 13 Camera 20 Information processing part 21 Image input / processing part 22 Rotation control part 23 Curing degree acquisition part 24 Curing completion determination unit 25 Light amount control unit 30 Stage 40 Photo-curing resin

Claims (11)

Irradiate the photo-curing resin with light,
Acquire a two-dimensional image of fluorescence emitted from the photocurable resin,
Calculate the degree of cure for each pixel of the two-dimensional image,
Derives curing degree or al hardening distribution mentioned above is calculated,
The center of gravity of the degree of cure distribution and the center of the adhesive surface of the photo-curing resin are calculated, and the deviation between the center of gravity of the degree of cure distribution and the center of the adhesive surface is smaller than a first predetermined value. A curing monitoring method for a photo-curing resin, characterized in that the curing of the curing resin is completed . When the deviation between the center of gravity of the degree of hardening distribution and the center of the adhesive surface is smaller than the first predetermined value, the inertia ellipse of the degree of hardening distribution is approximated, and the length ratio of the principal axis and the minor axis of the inertia ellipse It is determined whether or not the absolute value of the difference between 1 and 1 is smaller than a second predetermined value, and when the absolute value of the difference is smaller than the second predetermined value, it is determined that the curing has been completed. The curing monitoring method according to claim 1 . Irradiate the photocuring resin with light
  Acquire a two-dimensional image of fluorescence emitted from the photocurable resin,
  Calculate the degree of cure for each pixel of the two-dimensional image,
  Deriving the degree of cure distribution from the calculated degree of cure,
  Calculating the variance of the cure distribution,
  When the dispersion is smaller than a third predetermined value, it is determined that the curing of the photocurable resin is completed.
  A curing monitoring method for a photo-curing resin. Irradiate the photocuring resin with light
  Acquire a two-dimensional image of fluorescence emitted from the photocurable resin,
  Calculate the degree of cure for each pixel of the two-dimensional image,
  From the calculated degree of cure, calculate at least one of the minimum value, average value, median, mode of the two-dimensional distribution of the degree of cure,
  When at least one of the minimum value, the average value, the median value, and the mode value exceeds a predetermined threshold value, it is determined that the curing of the photocurable resin is completed.
  A curing monitoring method for a photo-curing resin. A light source for irradiating light to the photocurable resin;
An imaging unit for acquiring a two-dimensional image of fluorescence emitted from the photo-curable resin;
Deriving a calculated and hardening distribution degree of cure of the photocurable resin from the two-dimensional image, the center of gravity of the curing degree distribution, calculate the center of the bonding surface of the photocurable resin, the curing degree distribution An information processing unit that determines that the curing of the photo-curing resin is completed when a deviation between the center of gravity and the center of the adhesive surface is smaller than a first predetermined value ;
Curing monitoring device with The information processing unit
When the deviation between the center of gravity of the degree of hardening distribution and the center of the adhesive surface is smaller than the first predetermined value, the inertia ellipse of the degree of hardening distribution is approximated, and the length ratio of the principal axis and the minor axis of the inertia ellipse It is determined whether or not the absolute value of the difference between 1 and 1 is smaller than a second predetermined value, and when the absolute value of the difference is smaller than the second predetermined value, it is determined that the curing has been completed. The curing monitoring device according to claim 5. A light source for irradiating light to the photocurable resin;
  An imaging unit for acquiring a two-dimensional image of fluorescence emitted from the photo-curable resin;
  The degree of cure of the photocurable resin is calculated from the two-dimensional image to derive a degree of cure distribution, the variance of the cure degree distribution is calculated, and the photocurable resin when the variance is smaller than a third predetermined value. An information processing unit that determines that the curing of
  Curing monitoring device with A light source for irradiating light to the photocurable resin;
  An imaging unit for acquiring a two-dimensional image of fluorescence emitted from the photo-curable resin;
  Calculate the degree of curing of the photocurable resin from the two-dimensional image, and calculate at least one of the minimum value, average value, median value, and mode value of the two-dimensional distribution of the degree of curing from the calculated degree of curing, An information processing unit that determines that the curing of the photocurable resin is completed when at least one of the minimum value, the average value, the median value, and the mode value exceeds a predetermined threshold;
Curing monitoring device with Machine-readable cure monitoring program stored in memory and causing an information processing device to perform at least the following steps:
Receiving a two-dimensional image of fluorescence emitted from the photocurable resin;
Calculating a curing degree for each pixel of the two-dimensional image ;
It steps the calculated degree of cure or al hardening distribution derived, calculating the center of gravity of the cured size distribution, and a center of the bonding surface of the photocurable resin; and
Determining that the curing of the photo-curing resin is completed when a deviation between the center of gravity of the curing degree distribution and the center of the adhesive surface is smaller than a first predetermined value . Machine-readable cure monitoring program stored in memory and causing an information processing device to perform at least the following steps:
  Receiving a two-dimensional image of fluorescence emitted from the photocurable resin;
  Calculating a curing degree for each pixel of the two-dimensional image;
  Deriving a degree of cure distribution from the calculated degree of cure and calculating a variance of the degree of cure distribution; and
  A step of determining that the curing of the photo-curing resin is completed when the dispersion is smaller than a third predetermined value. Machine-readable cure monitoring program stored in memory and causing an information processing device to perform at least the following steps:
  Receiving a two-dimensional image of fluorescence emitted from the photocurable resin;
  Calculating a curing degree for each pixel of the two-dimensional image;
Calculating at least one of a minimum value, an average value, a median value, and a mode value of the two-dimensional distribution of the degree of hardening from the degree of hardening; and
  Determining that the curing of the photo-curing resin is completed when at least one of the minimum value, the average value, the median value, and the mode value exceeds a predetermined threshold value.