JP2003139697A - Resin degree-of-curing measuring apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin degree-of-curing measuring apparatus for accurately measuring the degree of curing in resin. SOLUTION: When reflection light is divided into two and a wavelength constituent where the change in intensity is smaller to the degree of curing in resin is used as a reference, an external factor simultaneously affects the intensity of both wavelength constituents even if the intensity of a larger wavelength constituent is changed by the external factor such as the temperature change in a target or the like, thus preventing the correlation values from being affected by the external factor other than the degree of curing in resin. An arithmetic unit 10r obtains an output signal according to the intensity of the wavelength constituents after resin coating and before the drive period of a curing-accelerating means, and after resin coating and during a drive period in the curing-accelerating means. Although the correlation values are greatly affected by the degree of curing in resin, it is not affected by other factors easily. As a result, the correlation values accurately change before resin curing and after curing, thus accurately detecting the degree of resin curing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin curing degree measuring device.

[0002]

2. Description of the Related Art A conventional resin curing degree measuring device is disclosed in Japanese Patent Laid-Open No.
It is described in JP-A-164692, JP-A-5-45288 and JP-A-62-103540.
In these devices, the resin is irradiated with infrared rays for measurement, and the resin curing determination is performed based on the reflected light before and after the resin curing.

[0003]

However, in the conventional device, since the relative value of the output signal of the photodetector before and after the measurement is obtained, the characteristic change of the curing accelerating means for curing the resin, the resin Due to the change in position and the change in temperature of the object, the relative values varied, and accurate curing degree measurement could not be performed.

The present invention has been made in view of the above problems, and is characterized by providing a resin curing degree measuring device capable of measuring an appropriate degree of resin curing.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and provides a resin curing degree measuring apparatus used together with a curing accelerating means for accelerating the curing of a resin applied on the surface of an object. set to target.

This resin curing degree measuring device comprises a branching means for branching the measurement light reflected by the surface of the object or transmitted through the object into first and second measurement light, and first measurement light branched by this branching means. The first wavelength component, the first and second filters for selectively passing the second wavelength component of the second measurement light, respectively,
It includes first and second photodetectors that detect the first and second wavelength components that have passed through the first and second filters, respectively, and a control device to which the output signals of the first and second photodetectors are input.

Here, in the present invention, the control device uses (a) the measurement light reflected by or transmitted through the surface of the object after the resin application and before the driving period of the curing accelerating means. 1st and 2nd when detected by 1st and 2nd photodetectors
The relative value between the output signals of the photodetector, and (b) the measurement light reflected by or transmitted through the surface of the object after the resin is applied and during the driving period of the curing accelerating means, the first and second lights. It is characterized in that the degree X of resin curing is calculated based on the correlation value between the output signals of the first and second photodetectors when detected by the detector.

The intensity of the wavelength component that has passed through the first and second filters has different rates of change with respect to the degree of progress of resin curing. That is, the intensity of one wavelength component changes relatively greatly as the resin curing progresses, and the intensity of the other wavelength component changes relatively small intensity as the resin curing progresses. In other words, from the perspective of the factor of resin curing degree,
The intensities of these wavelength components are affected differently.

Therefore, if the wavelength component having the smaller intensity change is used as a reference, even if the intensity of the wavelength component having the larger intensity changes due to an external factor such as a temperature change of the object, such an external component is generated. Since the factors affect the intensities of both wavelength components at the same time, these correlation values are less likely to be affected by external factors other than the resin curing degree.

The control device obtains output signals corresponding to the intensities of these wavelength components after the resin application and before the drive period of the curing promoting means and after the resin application and during the drive period of the curing promoting means. . As described above, the correlation value is greatly affected by the degree of resin curing, but is not easily affected by other factors, so that the correlation value changes more accurately before and after resin curing. Become.

Therefore, the present control device can accurately calculate the degree of curing X based on the correlation value before and after resin curing. That is, assuming that the degree X obtained when complete curing is performed is 100% and the degree X when no curing is performed is 0%, etc., the correlation values obtained before and after curing in each state. Can be made to correspond, and the degree X can be calculated based on these.

Further, (c) the first and the second detectors when the measuring light reflected by or transmitted through the surface of the solid object before the resin is applied is detected by the first and second photodetectors. It is preferable to calculate the calculation value X by further using the output signal of the second photodetector. The measurement light reflected by or transmitted through the surface of the solid object before the resin coating has more stable characteristics than the measurement light reflected by or through the resin before and after curing. By using this as a reference value and converting the intensities of both wavelength components into relative values, a more accurate degree of curing X can be measured.

The output signals in step (a) are A2, B
2. Output signals in step (b) are As and Bs, output signals in step (c) are A1 and B1, and known coefficients are Ko.
Then, the degree X is preferably given by the following equation.

[Equation 3] Output signals obtained in the steps (a) and (b), that is, the reflection intensities A2 and B of the respective wavelength components in the respective steps
2, As and Bs are steps (c) in which stable reflection is obtained.
The output signal at, that is, the relative value based on the reflection intensities A1 and B1 is converted for each wavelength. That is,
A2 is (A2 / A1), B2 is (B2 / B1), A
s is converted into (As / A1) and Bs is converted into (Bs / B1). Of course, the above-mentioned "reflection intensity" can be read as "transmission intensity".

The intensity of each wavelength component converted into a relative value is set as a correlation value before and after curing. Before curing, the ratio of wavelength B to wavelength A, that is, the correlation value is
Using the above converted value, (B2 / B1) / (A2 / A
1). After curing, the ratio of the wavelength B to the wavelength A, that is, the correlation value is
(Bs / B1) / (As / A1).

The ratio of the correlation values before and after curing is a value indicating the degree of curing, but here, in the case of complete curing, it is approximately 10.
The known coefficient Ko is used in the above equation indicating the degree of curing X so that the numerical value of 0% can be obtained.

As described above, the above equation is set so as to be greatly influenced by the degree of curing among various external factors. Therefore, the degree of cure X is very accurate.

Although the known coefficient Ko is used in the above equation, in the control device, the object having the already cured resin on the surface is used as the standard sample, and the first and the first cases when the standard sample is irradiated with the measuring light. 2 Determine the known coefficient Ko based on the output signal of the detector. In this case, since the known coefficient Ko is determined using the standard sample serving as the measurement reference when the apparatus is activated, the accurate degree X can be measured. The standard sample may be prepared each time the apparatus is activated, or the already prepared sample may be reused.

The curing accelerating means is an ultraviolet light source,
The first and second filters are filters that transmit wavelengths selected from wavelength bands other than ultraviolet rays as the first and second wavelength components, and the resin is preferably an ultraviolet curable resin. The UV curable resin is cured by irradiation with UV light from a UV light source.
Further, since the second filter is used, the influence of ultraviolet rays is removed, and the accurate degree of curing can be measured.

Further, the control device has a condition that the degree X is as follows:

[Equation 4] It is preferable to output a control signal for stopping the curing promoting means when the above condition is satisfied, and in this case, the curing promotion can be ended when the resin curing is completed.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION A resin curing degree measuring device according to an embodiment will be described below. The same elements will be denoted by the same reference symbols, without redundant description.

FIG. 1 is a block diagram of a resin curing degree measuring device. This resin curing degree measuring device 10 is provided with a surface 1 of an object 1.
It is used together with an ultraviolet light source (curing promoting means) 2 for promoting the curing of the resin RSN applied on the s. The resin curing degree measuring device 10 includes a light projecting system and a light receiving system.

The light projecting system includes a power source 10b housed in a housing 10a and a measurement light emitting light source (100W: 100W: with an aluminum reflecting mirror) which emits light by electric power supplied from the power source 10b.
Halogen lamp) 10c, optical fiber 1 for guiding the measurement light emitted from the measurement light emitting light source 10c to the shaping optical system 10d
0e. After being emitted from the optical fiber 10e, the measurement light (infrared ray) shaped into an appropriate beam diameter by the shaping optical system 10d is irradiated onto the resin RSN.

The measuring light which has passed through the resin RSN and reflected on the surface 1s of the object travels in the direction opposite to that at the time of projection and enters the light receiving system.

The light receiving system is a shaping optical system 10 which is also used as a light projecting system.
d, the shaping optical system 10d is provided with optical fibers 10f and 10g for transmitting the measurement light traveling in the direction opposite to that at the time of projecting. The optical fibers 10f and 10g branch the measurement light reflected on the object surface 1s, and after the measurement light is branched, the measurement light is incident on the first and second filters 10h and 10i, respectively. That is, the optical fiber 10
f and 10g function as branching means for branching the measurement light reflected by the object surface 1s into the first and second measurement lights.

Optical fibers 10e, 10f, 10g
The number of each of these optical fibers is one.
0e, 10f, 10g are bundled, and the optical fiber 1
0e, 10f, 10g are arranged so that one end of the shaping optical system 10d side is evenly distributed in a plane perpendicular to the optical axis (random arrangement), and the other ends are the optical fibers 10e, 10g.
Separated every f and 10 g.

The first and second filters 10h and 10i are
The first wavelength component (1580 nm) of the first measurement light and the second wavelength component (1620 nm) of the second measurement light branched by the optical fibers 10f and 10g are selectively passed. Here, the first and second filters 10h, 10i
Is the center wavelength (1580 nm,
1620 nm). More specifically, the first filter 10h includes a transmission wavelength band 158
The filter has a wavelength of 0 nm ± 20 nm (half-value width) and a transmittance of 30% or more. The second filter 10i has a transmission wavelength band 162.
0 nm ± 10 nm (half-value width): A filter having a transmittance of 30% or more.

The first and second wavelength components that have passed through the first and second filters 10h and 10i are collected by the condenser lens 10 respectively.
The first and second photodetectors (photodiode: InGaAs: 900 to 350) are focused by the light source j and 10k, respectively.
Ge having sensitivity to 0 nm, Ge may be used) 10 m, 10 n
Incident on. That is, the first and second wavelength components are detected by the first and second photodetectors 10m and 10n, respectively.

The magnitudes of the output signals of the first and second photodetectors 10m and 10n are proportional to the intensity of the incident light, and the output signals are amplified and digitally converted by the amplifier / AD converters 10p and 10q, respectively. , Is input to the arithmetic unit 10r. Here, the amplification / AD converters 10p and 10q and the arithmetic unit 10r are connected to the first and second photodetectors 10m and 10m.
A control device to which n output signals are input is configured.

The arithmetic unit 10r constituting the control unit is
(A) The first when the measurement light reflected by the object surface 1s is detected by the first and second photodetectors 10m and 10n "after" the resin application and before "before" the driving period of the curing accelerator. And the
2 Relative value between the output signals of the photodetectors 10m and 10n,
(B) The first when the measurement light reflected by the object surface 1s is detected by the first and second photodetectors 10m and 10n after the resin application "after" and during the drive period "during" of the curing accelerator. And the
2 The degree of resin curing X is calculated based on the correlation value between the output signals of the photodetectors 10m and 10n. This calculation result,
That is, the degree X is displayed on the display 10s.

The intensity of the wavelength components that have passed through the first and second filters 10h and 10i have different rates of change with respect to the degree of progress of resin curing. That is, the intensity I1 of the wavelength component (1580 nm) changes relatively small as the resin curing progresses, and the intensity I2 of the wavelength component (1620 nm) changes relatively large as the resin curing progresses. In other words, the intensities of these wavelength components are affected differently from the viewpoint of the factor of resin curing degree.

Therefore, with reference to the wavelength component (1580 nm) having the smaller intensity change, the intensity I2 of the wavelength component having the larger intensity (1620 nm) changes due to an external factor such as a temperature change of the object 1. However, since such an external factor affects the intensities of both wavelength components at the same time, these correlation values (I2 / I1) are less likely to be affected by external factors other than the resin curing degree. Become.

The arithmetic unit 10r is "after" the resin application, and "before" the driving period of the curing promoting means 2 and "after" the resin application.
In addition, during the driving period of the curing accelerating means 2, an output signal having a magnitude proportional to the intensities I1 and I2 of these wavelength components is obtained. As described above, the correlation value (I2 / I1) is greatly affected by the degree of resin curing, but is less affected by other factors. Therefore, the correlation value (I2 / I1) will change more accurately.

Therefore, the arithmetic unit 10r accurately calculates the degree of curing X based on the correlation value before resin curing (F = I2 / I1) and the correlation value after resin curing (R = I2 / I1). be able to. That is, assuming that the degree X obtained when complete curing is performed is 100% and the degree X when no curing is performed is 0%, etc., the correlation values obtained before and after curing in each state. F and R can be associated with each other, and the degree X can be calculated based on these.

The object 1 is made of a solid material such as Si.
And aluminum. The arithmetic unit 10r includes (c) first and second light when the measuring light reflected by the solid object surface 1s "before" the resin application is detected by the first and second photodetectors 10m and 10n. It is preferable to calculate the calculated value X by further using the output signals of the detectors 10m and 10n. Since the measurement light reflected by the object surface 1s made of a solid "before" the resin application has more stable characteristics than the measurement light reflected by interposing the resin before and after curing, with this as a reference value, If the intensities I1 and I2 of both wavelength components are relatively numerically expressed, a more accurate degree of curing X can be measured.

The output signal in step (a) is set to A2 (= I
1 (during curing)), B2 (= I2 (during curing)), the output signal in step (b) is As (= I1 (before curing)),
When Bs (= I2 (before curing)), the output signal in step (c) is A1 (= I1 (before coating)), B1 (= I2 (before coating)), and the known coefficient is Ko, the degree X is as follows: Is preferably given by

[Equation 5] Output signals obtained in the steps (a) and (b), that is, the reflection intensities A2 and B of the respective wavelength components in the respective steps
2, As and Bs are steps (c) in which stable reflection is obtained.
The output signal at, that is, the relative value based on the reflection intensities A1 and B1 is converted for each wavelength. That is,
A2 is (A2 / A1), B2 is (B2 / B1), A
s is converted into (As / A1) and Bs is converted into (Bs / B1).

The intensity of each wavelength component converted into a relative value is set as a correlation value before and after curing. Before curing, the ratio of wavelength B to wavelength A, that is, the correlation value is
Using the above converted value, (B2 / B1) / (A2 / A
1). After curing, the ratio of the wavelength B to the wavelength A, that is, the correlation value is
(Bs / B1) / (As / A1).

The summary is as follows.

(Correlation value before curing) Correlation value F = I2 (before curing) / I1 (before curing) ∝B2 / A
2≈ (B2 / B1) / (A2 / A1)).

(Correlation value after curing) Correlation value R = I2 (after curing (including during curing before complete curing)) / I1 (after curing (including during curing before complete curing))
∝Bs / As≈ (Bs / B1) / (As / A1)).

It is also possible to set X = R / F. The ratio of the correlation values before and after curing is a value indicating the degree of curing, but here, in order to be able to quantify approximately 100% in the case of complete curing, the known coefficient Ko in the above equation indicating the degree of curing X is used. Is used.

As described above, the above equation is set so as to be greatly influenced by the degree of curing among various external factors. Therefore, the degree of cure X is very accurate.

Although the known coefficient Ko is used in the above equation, in the arithmetic unit 10r, the already cured resin RSN is used for the surface 1s.
First and second detectors 10 when the object 1 above is used as a standard sample and the standard sample is irradiated with measurement light.
The known coefficient Ko is determined based on the output signals of m and 10n. In this case, since the known coefficient Ko is determined using the standard sample serving as the measurement reference when the apparatus is activated, the accurate degree X can be measured. The standard sample may be prepared each time the apparatus is activated, or the already prepared sample may be reused.

When obtaining the known coefficient Ko, the state before resin application, the state after resin application and before curing, and the state of the resin which has already been determined to be 100% cured are measured. With this device, the resin is irradiated with light and the light reflected on the surface is measured. Of course, this light passes through the resin itself. By substituting this into the equation that gives X and setting X = 100%, Ko can be determined.

In this apparatus, an ultraviolet light source was used as the curing promoting means 2. The first and second filters were filters that transmitted wavelengths selected from wavelength bands other than ultraviolet rays as the first and second wavelength components. The resin RSN is an ultraviolet curable resin. The ultraviolet curable resin RSN emits the ultraviolet light from the ultraviolet light source 2, specifically, the UV spot lamp, from the tip of the optical fiber and cures by irradiation of this ultraviolet light. In this device, the first and second filters 10h are used. , 10i are used, the influence of ultraviolet rays is removed, and accurate degree of curing can be measured.

The arithmetic unit 10r has a condition that the degree X is as follows:

[Equation 6] When the above condition is satisfied, a control signal for stopping the curing promoting means 2 is output. In this case, the hardening promotion of the resin RSN can be ended when the resin hardening is completed. Resin R
The SN is supplied onto the object surface 1s from a dispenser (not shown). The resin RSN is a photo-curable resin, and when the resin RSN is irradiated with the resin curing light from the resin curing ultraviolet light source 2, the polymer material, which is the main component of the resin RSN, undergoes a polymerization reaction to cure the resin RSN.

The resin RSN of this example is an acrylic adhesive. When the resin RSN is an acrylic adhesive, the ethylene double bond (= CH2) has an absorption spectrum at 1617 nm, and this bond is cleaved by polymerization, so that the wavelength of the spectrum 1617n
The light of m is used as the second wavelength component (selected by a bandpass filter including 1620 nm in this example). In this case, the strength I2 gradually decreases as the curing progresses, and stops changing when the curing ends.

FIG. 2 shows an acrylic adhesive on the surface 1s of the object.
It is a graph which shows the wavelength dependence of the reflectance of the reflected light (measurement light) when apply | coated on top. FIG. 3 is a graph showing the wavelength dependence of the absorbance by the resin when the acrylic adhesive is applied on the surface 1s of the object. FIG. 4 is a graph showing a time differential value of the strength ratio (I2 / I1) by the resin and a time dependency of the degree X when the acrylic adhesive is applied on the surface 1s of the object, which are indicated by a thick line and a thin line, respectively. The object 1 is aluminum. Note that FIG. 5 is a graph showing the relationship between the degree of curing progress (%) of the acrylic adhesive and the integrated light amount (mJ / cm ² ) of ultraviolet rays with which the acrylic adhesive is irradiated.

Reflectivity (strength) after curing as compared to before curing
Both decrease in the first and second wavelength components,
It can be seen that the second wavelength component is more strongly affected by curing.

When the resin RSN is an epoxy adhesive, the single bond (CH--CH) is 1166 nm.
In addition, since the CONH2 bond has an absorption spectrum at 1429 nm, the wavelength of the spectrum is 1166 nm.
, Or 1429 nm is used as the second wavelength component. In this case, the intensity I of the former gradually increases as the curing proceeds, and stops changing when the curing ends, whereas the intensity I of the latter gradually decreases as the curing progresses and stops changing when the curing ends.

Next, an example of control by the arithmetic unit 10r will be described.

FIG. 6 is a flow chart showing the control of the arithmetic unit 10r. First, a belt conveyor (not shown) is driven to move the object 1 to a region irradiated with the measurement light and the resin curing light (S1). Next, before irradiating the resin curing light, the measuring light is irradiated to perform measurement for obtaining the reference value (S2). Here, output signals corresponding to the intensities I1 and I2 (data A1 and B1) of the first and second wavelength components can be obtained (S21).

Next, the resin RSN as an adhesive is applied on the surface 1s of the object (S3), and thereafter, before the resin curing light is irradiated, the measuring light is irradiated and another reference value is set. Measurement for obtaining is performed (S4). Where the first and second
Output signals corresponding to the wavelength component intensities I1 and I2 (data A2 and B2) can be obtained (S41).

Next, resin curing is started. That is, the ultraviolet light source 2 is driven to apply the resin curing light (ultraviolet light) to the resin R.
Irradiate SN. While performing this irradiation, measurement light is irradiated, and measurement is performed to obtain a numerical value that depends on the current degree X of curing (S6). Here, output signals corresponding to the intensities I1 and I2 (data As, Bs) of the first and second wavelength components can be obtained (S61).

Next, the obtained values A1, B1, A2, B
2, degree of curing X using As, Bs and known coefficient Ko
Is calculated, and it is determined whether the degree X is greater than or equal to a predetermined value (S7). When the degree X is smaller than the predetermined value, the ultraviolet light source 2 is stopped and the irradiation of the resin curing light is stopped. This reveals that the resin RSN is completely cured.

Thereafter, a belt conveyor (not shown) is driven to move the object 1 to a region outside the region irradiated with the measurement light and the resin curing light, and the resin curing work is completed (S9).

FIG. 7 is a block diagram of a resin curing degree measuring device in which a measuring light direct detection optical system is added to the resin curing degree measuring device shown in FIG. That is, this apparatus includes optical fibers 10F and 10G that branch a part of the measurement light emitted from the measurement light emitting light source 10c, and the optical fibers 10F and 10G guide the branched measurement light to the wavelength-dependent light receiving system, respectively. ing.

The wavelength-dependent light receiving system selects the first and second wavelength components from the branched measuring light beams, and then makes the respective wavelength components incident on the photodetectors 10M and 10N. That is, the first filter 10H and the condenser lens 10J are used to select the first wavelength component (1620 nm), and the second filter 10I and the condenser lens 10K are used to select the second wavelength component (1580 nm). Photodetector 10M, 1
The output signals of 0N are amplified / AD converter 10P,
10Q is input to the arithmetic unit 10r as a digital signal.
Entered in. The intensities I1 and I2 of the respective wavelength components obtained here are defined as measurement light reference values C and D.

The measurement light reference values C and D are C1 and D1 obtained before resin curing and before resin curing starts, C2 and D2 obtained after resin coating and before resin curing, and after resin coating. Therefore, there are Cs and Ds obtained during the initiation of resin curing.

The data C1 and D1, the data C2 and D2, and the data Cs and Ds are data A1 and B1 (step S21), data A2 and B2 (step S41), respectively.
The data As and Bs can be obtained at the same time (step S61).

In this case, the degree X of resin curing can be corrected by the measurement light reference values C and D. That is, the degree X is given by the following equation.

[Equation 7] As a result, the noise component contained in the measurement light itself is reduced, and a more accurate degree X can be obtained. However, this equation is a correction of the above-mentioned equation of X, and in practice, It includes. Further, these equations can be subjected to other corrections. In the above description, 1580 nm is used as the center wavelength of the wavelength band as the first wavelength component when the acrylic resin is used.
It can also be m.

All the above-mentioned "reflection" can be read as "transmission". That is, the measurement light is “reflected” on the surface of the object when it is reflected on the surface of the object after passing through the resin and then in the opposite direction through the resin.
When the measurement light is transmitted through the resin and then the object is also transmitted, the surface of the object is “transmitted”. In either case, since the measurement light is transmitted through the resin, the degree of curing can be measured by detecting this.

[0062]

According to the resin curing degree measuring device of the present invention,
The degree of resin curing can be accurately measured.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a resin curing degree measuring device.

FIG. 2 is a graph showing the wavelength dependence of the reflectance of reflected light (measurement light) when an acrylic adhesive is applied on the object surface 1s.

FIG. 3 is a graph showing the wavelength dependence of the absorbance by the resin when an acrylic adhesive is applied on the surface 1s of the object.

FIG. 4 is a graph showing the time-dependent value of the strength differential (I2 / I1) and the degree X of the resin when an acrylic adhesive is applied to the surface 1s of the object.

FIG. 5: Curing progress (%) of acrylic adhesive and cumulative light amount (mJ / c) of ultraviolet rays applied to acrylic adhesive
is a graph showing the relationship between m ^2).

FIG. 6 is a flowchart showing control of the arithmetic unit 10r.

7 is a configuration diagram of a resin curing degree measuring device in which a measuring light direct detection optical system is added to the resin curing degree measuring device shown in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Object, 1s ... Object surface, 2 ... Curing acceleration means (ultraviolet light source), 10a ... Housing, 10h, 10i, 1
0H ... filter, 10I ... filter, 10e, 10f,
10g ... Optical fiber, 10F, 10G ... Optical fiber, 1
0m, 10n ... Photodetector, 10M, 10N ... Photodetector,
10d ... Shaping optical system, 10 ... Resin curing degree measuring device, 10
c ... Measuring light emitting light source, 10j, 10k ... Condensing lens, 1
0J ... condenser lens, 10K ... condenser lens, 10b ... power supply, RSN ... UV curable resin.

Claims (6)

[Claims] 1. A resin curing degree measuring device used together with a curing accelerating means for accelerating the curing of a resin applied on the surface of an object, wherein the measurement light reflected by the surface of the object or transmitted through the first And a branching means for branching into the second measuring light, a first wavelength component of the first measuring light branched by the branching means, and a first and second filter for selectively passing the second wavelength component of the second measuring light, respectively. And the first that has passed through the first and second filters
And first and second photodetectors for respectively detecting the second wavelength component, and a control device to which the output signals of the first and second photodetectors are input, the control device comprising: After the resin application, before the driving period of the curing promoting means, the measurement light reflected on or transmitted through the object surface is detected by the first and second photodetectors, and the first and second photodetectors are detected. (2) the relative value between the output signals of the photodetectors, and (b) the measurement light reflected by or transmitted through the surface of the object after the resin application and during the driving period of the curing promoting means, Resin curing degree measurement, characterized in that the degree of resin curing X is calculated based on the correlation value between the output signals of the first and second photodetectors when detected by the first and second photodetectors. apparatus. 2. The control device, when (c) the measuring light reflected by or transmitted through the surface of the solid object before the resin is applied is detected by the first and second photodetectors. Further using the output signals of the first and second photodetectors of,
The resin curing degree measuring device according to claim 1, wherein the degree X is calculated. 3. The output signal in the step (a) is A
2, B2, the output signal in the step (b) is As, B
s, the output signal in the step (c) is A1, B1, and the known coefficient is Ko, the degree X is expressed by the following equation: The resin curing degree measuring device according to claim 2, wherein 4. The control device uses an object having a cured resin on its surface as a standard sample, and based on output signals of the first and second detectors when the standard sample is irradiated with measurement light. The resin curing degree measuring device according to claim 3, wherein the known coefficient Ko is determined by the above. 5. The curing promoting means is an ultraviolet light source,
The first and second filters are filters that transmit a wavelength selected from a wavelength band other than ultraviolet rays as the first and second wavelength components, and the resin is an ultraviolet curable resin. The resin curing degree measuring device as described in. 6. The control device sets the condition that the degree X is as follows: The resin curing degree measuring device according to claim 3, wherein a control signal for stopping the curing accelerating means is output when the above condition is satisfied.