KR20090031233A - Curing state measuring device - Google Patents

Abstract

A curing state measure device is provided to measure the curing state of UV adhesive interposed between sheets by using an ultraviolet scanning unit and a determining unit. A plurality of head units(112) are arranged under an ultraviolet scanning unit(106). The head unit is arranged in a direction meeting at right angle of the conveying direction of a multilayer. A determining unit measures the curing state of the UV adhesive in the one- direction of the multilayer. A curing state measure device measures the curing state of the UV adhesive(206) interposed between a first seat(204) and a second sheet(202) on a real time.

Description

Curing status measuring device {CURING STATE MEASURING DEVICE}

TECHNICAL FIELD This invention relates to the hardening state measuring apparatus applied to the hardening process of ultraviolet curable resin, and especially relates to the apparatus suitable for the production line of a multilayer film.

In recent years, the ultraviolet curing method (Ultra Violet Curing) is used as a hardening method of an adhesive agent or a coating agent in many industrial fields. The ultraviolet curing method has many advantages as compared with the thermal curing method using thermal energy, which can be applied to a heat-vulnerable product having a short curing time that does not dissipate harmful substances in the air.

In the ultraviolet curing method, an ultraviolet curable resin is used which is mainly a liquid before ultraviolet irradiation but changes to a solid after ultraviolet irradiation. Such ultraviolet curable resin contains at least one of a monomer and an oligomer as a subject, and also contains a photoinitiator. The photopolymerization initiator receives the irradiated ultraviolet rays to generate radicals or cations, and the generated radicals and cations cause a polymerization reaction with the monomers and oligomers. With this polymerization reaction, monomers and oligomers change into polymers, the molecular weight becomes extremely large, and the melting point decreases. As a result, the ultraviolet curable resin cannot maintain the liquid state and changes to a solid.

By the way, in recent years, the development of the technology of a flat display, including a liquid crystal display (LCD) is progressing rapidly. As a factor for determining the display performance of such a flat display, there is a multilayer film formed on the display surface. This multilayer film is formed by stacking sheets each having unique optical characteristics. In many cases, such a multilayer film is formed by laminating these sheets using an ultraviolet curable resin. In the production line of such a multilayer film, a plurality of bonding treatments are performed at a relatively high speed (a few 10 m / sec).

In general, it is not easy to measure the degree of curing of the ultraviolet curable resin. As a method of measuring the hardened state of an ultraviolet curable resin, the method of using a Fourier Transform Infrared Spectrophotometer (FT-IR) is proposed (for example, nonpatent literature 1).

[Non-Patent Document 1] Ikei Shigehiko, Matsuhara Hideki, "Measurement of the Curing Rate of Ultraviolet Curing Resin Using Differential Infrared Spectroscopy", 2005 Aichi Institute of Industrial Technology Research

However, in the method disclosed in the above-mentioned Non-Patent Document 1, the process is very complicated, for example, it is necessary to perform an eighth differential processing. Therefore, although it is possible to apply about a laboratory level, a destructive inspection (extraction inspection), etc., it is difficult to apply in an actual production line. Moreover, since the film thickness of ultraviolet curable resin (adhesive agent) is thin compared with the film thickness of a sheet | seat, there also exists a problem that the infrared rays generate | occur | produce from a sheet are relatively large, and it is difficult to obtain sufficient measurement precision.

Therefore, the extraction test is performed on the product after manufacture, and there is no other way but to judge whether the said product is normal. Therefore, even if the degree of curing of the ultraviolet curable resin was not appropriate due to any cause, this could not be corrected during manufacturing, and the after-treatment was inevitably performed.

Thus, in the production line which joins a some sheet-like member, the measuring method of the ultraviolet curable resin which can handle practically did not exist.

Then, this invention was made | formed in order to solve such a problem, The objective is to provide the hardening state measuring apparatus which can measure the hardening state in the multilayer film manufactured continuously using an ultraviolet curable resin.

The inventors of the present invention find that the photopolymerization initiator itself contained in the ultraviolet curable resin emits observable fluorescence correlated with the curing state of the ultraviolet curable resin in response to ultraviolet irradiation to the ultraviolet curable resin, and uses this fact. This invention is performed.

According to one aspect of the present invention, there is provided a curing state measuring apparatus for measuring a curing state of an ultraviolet curable resin comprising a main body and a photopolymerization initiator comprising at least one of a monomer and an oligomer. The curing state measuring apparatus includes a first irradiation means for irradiating ultraviolet rays for exciting the ultraviolet curable resin, first light receiving means for receiving fluorescence generated from the ultraviolet curable resin by irradiation of ultraviolet rays, and a first On the basis of the amount of fluorescence measured by the light receiving means, determination means for determining the good / bad of the curing state of the ultraviolet curable resin is provided. The ultraviolet curable resin is interposed between at least two sheet members, and the first irradiation means irradiates the ultraviolet curable resin with ultraviolet rays through one sheet member.

Preferably, at least two sheet-like members are continuously conveyed along a predetermined conveyance direction, and the conveyance paths of at least two sheet-like members are cured to irradiate ultraviolet rays for promoting the curing reaction in the ultraviolet curable resin. The device is deployed. The 1st irradiation means and the 1st light receiving means consist of the some head part arranged in the direction orthogonal to a conveyance direction.

Also preferably, the judging means judges the good / bad of the cured state based on the magnitude of the amount of fluorescence from the ultraviolet curable resin after passing through the curing device.

More preferably, the judging means judges the good / bad of the hardened state based on the variation of the amount of fluorescence in the direction orthogonal to the conveying direction.

Moreover, More preferably, the hardening state measuring apparatus is ultraviolet-curable resin by the 2nd irradiation means which irradiates the ultraviolet-ray for excitation with respect to the ultraviolet curable resin before passing through a hardening apparatus, and the irradiation of the ultraviolet-ray by a 2nd irradiation means. Also provided is a second light receiving means for receiving the fluorescence generated from the. The judging means judges the good / bad of the cured state of the ultraviolet curable resin based on the amount of fluorescence measured by the first light receiving means and the amount of fluorescence measured by the second light receiving means.

Preferably, the light receiving means includes first spectroscopic means for acquiring a spectrum of fluorescence by spectroscopy of fluorescence. The judging means judges the good / bad of the cured state of the ultraviolet curable resin based on the intensity value of the specific wavelength corresponding to the ultraviolet curable resin in the spectrum of the fluorescence acquired by the first spectroscopic means.

Also preferably, the curing state measuring device may be formed from the ultraviolet curable resin by the second irradiation means for irradiating ultraviolet rays for excitation to the ultraviolet curable resin before passing through the curing device and the irradiation of ultraviolet rays by the second irradiation means. By receiving the generated fluorescence, a second spectroscopic means for acquiring the spectrum of fluorescence is further provided. The judging means judges the good / bad of the curing state of the ultraviolet curable resin based on the spectrum acquired by the first spectroscopic means and the spectrum obtained by the second spectroscopic means.

According to this invention, the hardening state in the multilayer film manufactured continuously using an ultraviolet curable resin can be measured.

EMBODIMENT OF THE INVENTION Embodiment of this invention is described in detail, referring drawings. In addition, about the same or equivalent part in drawing, the same code | symbol is attached | subjected and the description is not repeated.

[Embodiment 1]

(Schematic Configuration of Production Line)

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic block diagram of the ultraviolet irradiation system 100A provided with the hardening state measuring apparatus which concerns on Embodiment 1 of this invention.

With reference to FIG. 1, the hardening state measuring apparatus which concerns on this invention is typically applied to the production line where two types of sheet-like members are continuously stuck by the UV adhesive which consists of an ultraviolet curable resin. Specifically, while the 1st sheet 204 is sent out by the delivery roller 102, UV adhesive 206 is apply | coated in the predetermined position with respect to one side (adhesion surface) of the 1st sheet 204. do. On the downstream side of the application position of the UV adhesive 206, the second sheet 202 is bonded to the first sheet 204 by the delivery roller 104. In this manner, the first sheet 204 and the second sheet 202 laminated through the UV adhesive 206 are further irradiated with ultraviolet rays from the ultraviolet irradiation unit 106 located on the downstream side. The ultraviolet irradiator 106 is a curing apparatus that irradiates ultraviolet rays for promoting the curing reaction in the ultraviolet curable resin 206, and is typically composed of a plurality of ultraviolet lamps or the like, and emits ultraviolet rays from the ultraviolet irradiator 106. The UV adhesive 206 hardens | cures, and the 1st sheet 204 and the 2nd sheet 202 adhere | attach.

On the downstream side of this ultraviolet irradiation part 106, the some head part 112 which comprises the hardening state measuring apparatus which concerns on this embodiment is arrange | positioned. These head parts 112 are arrange | positioned in the direction orthogonal to a conveyance direction, and measure the hardening state of the UV adhesive agent in the one direction of the multilayer film conveyed. The hardened state measuring device measures the hardened state of the UV adhesive 206 interposed between the first sheet 204 and the second sheet 202 in real time (inline). Moreover, if there is any abnormality in the hardening state in this UV adhesive agent 206, the action by the cause of this abnormality, for example, replacement of the ultraviolet lamp which comprises the ultraviolet irradiation part 106, etc. is performed.

In addition, although the structure which attaches two types of sheet-like member was illustrated in FIG. 1, this invention is applicable also to the production line which attaches more types of sheet-like member.

(Ultraviolet curing resin)

First, the ultraviolet curing resin (UV adhesive 206) used by the ultraviolet irradiation system which concerns on this invention is demonstrated. The ultraviolet curable resin is mainly a liquid before ultraviolet irradiation, but changes (cures) into a solid after ultraviolet irradiation. In addition, in this specification, a "ultraviolet curing resin" is used generically regardless of the state (liquid state before ultraviolet irradiation or the solid state after ultraviolet irradiation).

The ultraviolet curable resin before ultraviolet irradiation (before hardening) contains at least one of a monomer and an oligomer, a photoinitiator, and various additives. Monomers and oligomers are the subjects, and a polymerization reaction (main chain reaction, crosslinking reaction, etc.) is caused by radicals and cations in which a photopolymerization initiator is generated by receiving ultraviolet rays. And with this polymerization reaction, a monomer and an oligomer turn into a polymer, the molecular weight becomes extremely large, and a melting point falls. As a result, the ultraviolet curable resin changes from a liquid to a solid.

As an example, a monomer and an oligomer consist of polyester acrylate, a urethane acrylate, a polybutadiene acrylate, a silicone acrylate, an epoxy acrylate, etc. A monomer is also called a monomer and is a state used as a raw material when a polymer is synthesize | combined by a polymerization reaction. On the other hand, an oligomer is also called oligomer, and is a state with a comparatively low degree of polymerization of about 2-20 degrees.

Photopolymerization initiators are roughly classified into radical polymerization initiators that receive ultraviolet rays to generate radicals, and cationic polymerization initiators that receive ultraviolet rays to generate cations. In addition, a radical polymerization initiator is used with respect to an acryl-type monomer and oligomer, and a cationic polymerization initiator is used with respect to an epoxy-type and vinyl ether type monomer and oligomer. Moreover, you may use the photoinitiator which consists of a mixture of a radical polymerization initiator and a cationic polymerization initiator.

The radical polymerization initiator is roughly classified into hydrogen drawing type and intramolecular cleavage type according to the radical generating process. The hydrogen drawing type consists of benzophenone, methyl oxobenzoyl benzoate, etc. as an example. On the other hand, the intramolecular cleavage is, for example, benzoin ether, benzyl dimethyl ketal, α-hydroxyalkylphenone, α-aminoalkylphenone, oxobenzoyl methyl benzoate (OBM), 4-benzoyl-4'-methyl Diphenyl sulfide (BMS), isopropyl thioxanthone (IPTX), diethyl thioxanthone (DETX), ethyl 4- (diethylamino) benzoate (DAB), 2-hydroxy-2-methyl-1 -Phenyl-propane-one, benzyl dimethyl ketal (BDK), 1,2 alpha hydroxyalkylphenone, and the like.

In addition, a cation polymerization initiator consists of diphenyl iodonium salt etc. as an example.

In addition, in this specification, a "photoinitiator" does not mean that the ability to start a photoinitiation reaction remains, and the monomer and oligomer which change by the original photoinitiator contributes to a photoinitiation reaction, or which are a target of a photoinitiation reaction are It is used by the meaning including what consists of a substance which does not exist in the surrounding and which does not contribute to the start of photopolymerization reaction already. Here, the photopolymerization initiator after contributing to the photopolymerization initiation reaction is bound to the terminal of the polymer in many cases while maintaining the original size of the molecule or splitting into two or more molecules.

As described above, the inventors of the present application found that the photopolymerization initiator itself contained in the ultraviolet curable resin emits observable fluorescence correlated with the curing state of the ultraviolet curable resin in response to ultraviolet irradiation.

More specifically, the present inventors investigated the wavelength of the light radiated | emitted when the ultraviolet-ray which has wavelength 365nm was irradiated to typical ultraviolet curable resin using the spectrum analyzer. As a result, it was confirmed from the ultraviolet curable resin that light (fluorescence) having a wavelength longer than that of the ultraviolet rays was emitted.

Here, the photoinitiator contained in ultraviolet curable resin has the following properties.

(1) The ability (proton yield, molar extinction coefficient) to generate active species (radical, acid, etc.) for initiating a polymerization reaction is high.

(2) Produces highly reactive active species.

(3) The spectral region of the excitation energy for exhibiting the ability to generate active species is in the ultraviolet region.

That is, the photoinitiator is a thing of the molecular structure which is easy to absorb an ultraviolet-ray, and is easy to give energy (electron) by absorbing an ultraviolet-ray to another molecule.

On the other hand, since the monomer and oligomer which are the subject of ultraviolet curing resin have a structure in which a carrier (electron) does not move smoothly in a molecule | numerator, it is thought that it hardly emits fluorescence.

Accordingly, the present inventors concluded that the photopolymerization initiator is essentially a material having a property of receiving ultraviolet rays and emitting fluorescence. The ultraviolet irradiation system which concerns on this invention measures the fluorescence radiated | emitted from this photoinitiator, and judges the hardening state of an ultraviolet curable resin from a measurement result.

(Configuration of Curing State Measuring Device)

FIG. 2: is a schematic external view of the hardening state measuring apparatus 110 which concerns on Embodiment 1 of this invention.

Referring to FIG. 2, the curing state measuring device 110 includes a head 112 and a control unit 114, and the control unit 114 includes a central processing unit (CPU), a random access memory (RAM), and the like. And a control board 114a mounted thereon.

The head part 112 irradiates the ultraviolet-ray 50 for a measurement to the multilayer film etc. after the hardening reaction which is a measurement object, and receives the fluorescence 52 produced by this ultraviolet-ray 50 for a measurement. Moreover, the control part 114 controls the irradiation timing, the irradiation amount, etc. of the ultraviolet-ray 50 for measurement from this head part 112, receives the fluorescent amount received by the head part 112, and hardens an ultraviolet-ray. The hardening state of resin (UV adhesive) is judged.

3 is a schematic configuration diagram of a curing state measuring device 110 according to Embodiment 1 of the present invention.

Referring to FIG. 3, the control unit 114 includes a CPU 40, a panel unit 38, a storage unit 46, and a network interface unit (I / F) 48. The panel portion 38 also includes a display portion 42 and an operation portion 44.

The CPU 40 is a control device that takes charge of the entire processing in the curing state measuring device 110, and realizes the following process by reading and executing a program stored in the storage unit 46 or the like in advance. Specifically, the CPU 40 receives instructions from a control device or the like that controls the entirety of a production line (not shown) via the network interface unit 48. And CPU 40 irradiates the ultraviolet-ray 50 for a measurement from the head part 112 toward a measurement object in response to such a command. The head part 112 receives the fluorescence 52 which generate | occur | produces by this ultraviolet-ray 50 for a measurement, and outputs the measured value according to this light reception amount to CPU40. CPU 40 judges the hardening state in the ultraviolet curable resin (UV adhesive) made into object based on this measured value.

The display unit 42 is a display device for displaying information on the curing reaction to the user. For example, the display unit 42 includes a display such as an LCD (Liquid Crystal Display) or a CRT (Cathode-Ray Tube).

The operation unit 44 is a command input device that receives an operation command from a user, and, as an example, includes a switch, a touch panel, a mouse, or the like, and outputs an operation command in response to a user operation to the CPU 40.

The storage unit 46 includes a nonvolatile memory for storing a program and various settings, a volatile memory for temporarily deploying a program, and the like.

The network interface 48 is a portion for performing data communication between the upper control device and another curing state measuring device 110. As an example, the Ethernet interface 48 or Ethernet (Universal Serial Bus) And the like.

On the other hand, the head portion 112 includes a light transmission drive circuit 20, a light transmission element 22, a half mirror 24, an optical filter 26, a light receiving element 28, and a high pass filter circuit ( A high pass filter (HPF) 30, an amplifier circuit 32, a sample hold circuit (S / h: Sample and Hold) 34, and an analog-to-digital converter (ADC) 36 are provided.

The translucent drive circuit 20 supplies the drive power for generating the ultraviolet-ray 50 for measurement in the translucent element 22 in response to the control command from the CPU 40. In order to remove the extraneous light, it is preferable that the intensity | strength ultraviolet-ray 50 changes periodically so that the amount of fluorescence radiated | emitted from a photoinitiator can be measured more correctly. Therefore, the transmissive drive circuit 20 supplies the transmissive element 22 with driving power that changes at a predetermined cycle in a period in which a control command for instructing irradiation is given from the CPU 40.

The light transmissive element 22 is an ultraviolet light source which generates the ultraviolet-ray 50 for a measurement, and consists of an ultraviolet LED typically. In addition, the main emission peak of the ultraviolet ray for measurement 50 generated in the light transmitting element 22 is preferably 365 nm.

The measurement ultraviolet ray 50 generated by the light transmitting element 22 by receiving the driving power supplied from the light transmitting drive circuit 20 passes through the half mirror 24 and focuses at a predetermined irradiation position. The ultraviolet ray 50 for measurement is received, and the fluorescence 52 corresponding to the hardened state is generated in the ultraviolet ray cured resin. Part of the generated fluorescence 52 propagates in the reverse direction to the ultraviolet light 50 for measurement and propagates substantially the same propagation path for the ultraviolet light for measurement 50 to enter the half mirror 24.

The half mirror 24 changes the propagation direction of the fluorescence 52 downward in the plane of the paper. The fluorescence 52 then passes through the optical filter 26 and enters the light receiving element 28. In other words, the half mirror 24 separates the ultraviolet rays 50 for measurement from the light transmitting element 22 and the fluorescence 52 emitted from the ultraviolet curable resin. In this manner, the light receiving element 28 ensures the fluorescence 52 having a weak intensity by separating the ultraviolet rays 50 and the fluorescence 52 for the measurement in which the half mirror 24 propagates on the same optical path. Can be detected.

The optical filter 26 is disposed to suppress the measurement ultraviolet ray 50 emitted from the light transmitting element 22 from directly entering the light receiving element 28, and attenuates the light in the ultraviolet region while being visible. And to transmit light in the region. As an example, the optical filter 26 consists of a filter of a dielectric multilayer film whose wavelength transmits light of 410 nm or more.

The light-receiving element 28 consists of a photodiode as an example, and generate | occur | produces the electrical signal according to the intensity of the fluorescence which entered the half mirror 24 and the optical filter 26 and entered.

In the hardening state measuring apparatus 110 which concerns on this embodiment, it is thought that fluorescence generate | occur | produces from ultraviolet curable resin also by disturbance light, such as illumination light. Since the fluorescence generated by the disturbance light mainly consists of a direct current (DC) component, the fluorescence caused by the disturbance light is separated on the frequency domain. That is, the intensity | strength change of the ultraviolet-ray 50 for a measurement is irradiated to the intensity | strength the ultraviolet-ray 50 for measurement which contains an alternating current component (for example, a pulse shape change), and shows the fluorescent amount measured by this irradiation. The periodic component corresponding to the period is extracted and measured as the amount of fluorescence generated by the ultraviolet ray 50 for measurement.

The high pass filter circuit 30 is a filter for extracting a periodic component (component due to the ultraviolet ray 50 for measurement) of the amount of fluorescence detected by the light receiving element 28, and the intensity of the ultraviolet ray 50 for measurement. The high frequency component is passed through the periodic component corresponding to the change cycle.

The amplifying circuit 32 amplifies the output signal from the HPF 30 at a predetermined amplification rate (current voltage conversion rate) and outputs it to the sample hold circuit 34. The sample hold circuit 34 samples an output signal from the HPF 30 in synchronization with the pulse period of the ultraviolet ray 50 for measurement irradiated from the light transmitting element 22, and at the next sampling time. Preserve until. As a result, a value corresponding to the maximum amplitude value of each pulse is output from the sample hold circuit 34. The signal (analog voltage signal) output from the sample hold circuit 34 is converted into a digital value by the analog-to-digital converter 36, and output to the CPU 40 as a measurement of the amount of fluorescence.

(Irradiation area of ultraviolet rays for measurement)

FIG. 4: is a figure which shows typically the irradiation area of the ultraviolet-ray for measurement 50 irradiated from the head part 112 of the hardening state measuring apparatus which concerns on Embodiment 1 of this invention. FIG. 4A shows a case where a single head portion 112 is used, and FIG. 4B shows a case where the plurality of head portions 112 are arranged in a direction orthogonal to the conveying direction of the production line. Indicates.

Referring to FIG. 4A, the curing state measuring device 110 according to the present embodiment irradiates the ultraviolet ray 50 for measurement from the head 112 to the measurement target, and the ultraviolet ray 50 for measurement. The fluorescence 52 generated by the light is received. In general, the size of the irradiation area of the measurement ultraviolet light 50 irradiated from the head part 112 is designed to be larger than the size of the light receiving area in which the head part 112 receives fluorescence.

On the other hand, in the ultraviolet curable resin, hardening reaction may generate | occur | produce also by this ultraviolet-ray 50 for a measurement. Therefore, when the intensity | strength of the ultraviolet-ray 50 for measurement irradiated from the head part 112 is comparatively large, about the part corresponded to the irradiation area of the ultraviolet-ray 50 for measurement, a hardening reaction is compared with another part. There is a fear to promote.

Thus, as shown in FIG. 4B, the plurality of head portions 112 are arranged in a direction orthogonal to the conveyance direction, and the irradiation area of the ultraviolet rays for measurement is disposed between the adjacent head portions 112. It is preferable to overlap. That is, even if the irradiation intensity of the measurement ultraviolet ray in the direction orthogonal to a conveyance direction is made as uniform as possible, even if the irradiation intensity of the measurement ultraviolet ray is comparatively high, and an ultraviolet curable resin produces hardening reaction by this measurement ultraviolet ray, The influence on a final product (especially hardening unevenness in surface) can be suppressed. Moreover, since it is a reaction process which hardens an ultraviolet curable resin, even if an extra ultraviolet ray is irradiated to the ultraviolet curable resin, the influence on a final product can be ignored. That is, it is good to think only what irradiates (cured unevenness) in a sheet surface to affect the end product.

It is a figure for demonstrating the influence by the irradiation unevenness of the ultraviolet-ray for measurement. FIG.5 (a) shows the case where there exist few overlapping parts of the ultraviolet-ray for measurement, and FIG.5 (b) shows the case where the ultraviolet-ray for measurement overlaps over a predetermined range.

Referring to FIG. 5A, when the ultraviolet rays for measurement irradiated from the head portion 112 do not overlap sufficiently in the direction orthogonal to the conveying direction, unevenness of the irradiation intensity of the ultraviolet rays for measurement in the direction orthogonal to the corresponding direction. (Deviation) becomes relatively large. On the other hand, referring to FIG. 5 (b), when the ultraviolet rays for measurement irradiated from the head 112 are overlapped over a predetermined range in the direction orthogonal to the conveyance direction, the ultraviolet rays for measurement in the orthogonal direction. The unevenness (deviation) of the irradiation intensity of is relatively small.

As shown in FIG.5 (b), the influence on a final product can be suppressed by suppressing the dispersion | variation in the irradiation intensity of the ultraviolet-ray for measurement in the direction orthogonal to a conveyance direction.

(Relationship between Cured State and Fluorescence)

In many ultraviolet curing resins, the amount of fluorescence generated increases with the progress of the curing reaction. This is considered to be due to the following mechanism. That is, the photopolymerization initiator is consumed with the progress of the curing reaction (polymerization reaction), and the unreacted photopolymerization initiator is reduced, so that the active species for the photoenergy in the photoenergy due to the ultraviolet irradiation absorbed by the photopolymerization initiator and the polymerization reaction ( The amount of chemical energy used for the production of radicals, acids, etc.) is reduced. On the other hand, since the photopolymerization initiator retains the property of easily absorbing ultraviolet rays even after being used in the polymerization reaction, the amount of light energy generated by the photopolymerization initiator absorbs ultraviolet rays for measurement is maintained, and is different from chemical energy such as fluorescence or heat. Is converted into energy of form. As a result, the amount of fluorescence tends to increase as the curing reaction of the ultraviolet curable resin proceeds. In addition, since such a tendency originates in the basic composition of ultraviolet curable resin, it becomes what is common to many ultraviolet curable resins.

FIG. 6 is a graph showing the relationship between the irradiation time and the amount of generated fluorescence when irradiating ultraviolet rays having a predetermined intensity to a general ultraviolet curable resin.

Referring to FIG. 6, it can be seen that as the irradiation time of ultraviolet rays increases, the amount of generated fluorescence monotonously increases. Since the irradiation time of an ultraviolet-ray has a high correlation with the hardening degree of an ultraviolet curable resin, the hardening state of an ultraviolet curable resin can be judged based on the amount of fluorescence which generate | occur | produces from an ultraviolet curable resin. As an example, when the amount of fluorescence generated from the ultraviolet curable resin is compared with a predetermined threshold (threshold α1 in FIG. 6), and the amount of fluorescence exceeds the threshold α1, the ultraviolet curable resin is sufficiently cured. You can judge. In addition, this threshold value α1 can be experimentally obtained in advance.

(Control structure 1)

7 is a block diagram showing a control structure of the control unit 114 according to Embodiment 1 of the present invention. In this embodiment, the some hardening state measuring apparatus is arrange | positioned, and the control part 114 corresponding to each hardening state measuring apparatus is the good / bad of the hardened state in the part (hereafter also called "track") of a measurement object. Judge.

Referring to FIG. 7, each control unit 114 includes a subtraction unit 302 and a comparison unit 304 as its function. The subtractor 302 subtracts the predetermined offset amount β from the amount of fluorescence measured by the corresponding head portion 112. This offset amount β corresponds to the amount of fluorescence generated from the sheet-like member constituting the multilayer film to be measured. That is, the amount of fluorescence measured by the head part 112 contains the component which generate | occur | produces from an ultraviolet curable resin, and the component which generate | occur | produces from each sheet-like member. Therefore, the subtractor 302 subtracts the amount of fluorescence corresponding to the component generated from the sheet-like member from the amount of fluorescence measured by the head portion 112. This offset amount β can be experimentally determined in advance, and can be determined from the measured amount of fluorescence, for example, in a state where no ultraviolet curable resin is applied.

The comparison unit 304 compares the value output from the subtraction unit 302 with the threshold value α1, and if the value exceeds the threshold value α1, the comparison unit 304 determines that the curing state is good. Is determined to be bad. This threshold value α1 can also be experimentally obtained in advance.

In this way, each of the plurality of control units 114 determines the good / bad of the curing state in the corresponding track, and outputs the determination result. Based on these judgment results, it can be judged what kind of abnormality is occurring in which part of a production line. In addition, in a production line, since a measurement object is conveyed according to a conveyance direction, when some abnormality generate | occur | produces, it is thought that hardening defect is continuously occurring in the same track.

Further, by storing the good / bad judgment result of the hardened state from the plurality of control units 114 and the line speed (extending distance) in association with each other, it is possible to specify a site where the hardened state is insufficient in the final product. In addition, the result of such mapping may be displayed two-dimensionally.

(Control structure 2)

Regarding the multilayer film used for a flat display etc., it is necessary to suppress hardening unevenness in surface. Therefore, as described above, it is necessary not only to judge based on the absolute value of the magnitude of the fluorescence amount from each track, but also to determine whether the deviation of the fluorescence amount between the tracks is stored within the allowable range.

8 is a block diagram showing a control structure for determining the curing good / failure according to Embodiment 1 of the present invention. Such a control structure may be mounted on one of the plurality of control units 114, or may be mounted on a control device or the like that integrates the plurality of control units 114.

The control structure shown in FIG. 8 includes a maximum value extraction section (MAX) 312, a minimum value extraction section (MIN) 314, a subtraction section 316, and a comparison section 318.

The maximum value extraction section 312 extracts the maximum of the fluorescence amounts respectively measured by the plurality of head sections 112. In addition, the minimum value extraction unit 314 extracts the minimum of the fluorescence amounts respectively measured by the plurality of head portions 112. Subsequently, the subtractor 316 calculates a difference between the amount of fluorescence extracted by the maximum value extraction unit 312 and the amount of fluorescence extracted by the minimum value extraction unit 314. That is, the subtractor 316 calculates the difference between the maximum value and the minimum value among the fluorescence amounts respectively measured by the plurality of head portions 112.

The comparison unit 318 compares the difference between the maximum value and the minimum value of the fluorescence amount calculated by the subtraction unit 316 with a predetermined threshold value α2, and if this value exceeds the threshold value α2, the surface of the multilayer film It is considered that hardening unevenness is generated inside, and it is judged that the hardened state is defective. Otherwise, it is determined that the curing state is good. That is, when the comparison part 318 exceeds the allowable range of the difference (deviation) between the maximum value and the minimum value among the fluorescence amounts measured by the plurality of head portions 112, it is determined that the curing is poor. This threshold value α2 can be experimentally obtained in advance.

According to embodiment of this invention, the hardening state of the ultraviolet curable resin can be judged inline in the production line which attaches a some sheet-like member using an ultraviolet curable resin (UV adhesive). Therefore, even when abnormality etc. arise in the middle of manufacture, while the occurrence of the abnormality can be detected, the production line etc. can be adjusted based on the above content. This makes it possible to avoid the situation where the whole product is found to be defective after the manufacture, unlike the case where the extraction inspection is carried out after the fact.

[First Modification of Embodiment 1]

In Embodiment 1 mentioned above, although the same head part irradiated the ultraviolet-ray for measurement, and demonstrated the structure which receives fluorescence, you may comprise each function separately.

FIG. 9: is a schematic block diagram of the ultraviolet irradiation system 100B provided with the hardening state measuring apparatus which concerns on the 1st modified example of Embodiment 1 of this invention.

Referring to FIG. 9, in the ultraviolet irradiation system 100B according to the present embodiment, the first sheet 204 and the second sheet 202 are measured downstream on a position where they are laminated via the UV adhesive 206. An irradiation head portion 122 and a plurality of light receiving head portions 124 for irradiating the ultraviolet rays for use are arranged.

FIG. 10: is a figure for demonstrating the positional relationship of the irradiation head part 122 and the light receiving head part 124. As shown in FIG.

Referring to FIG. 10, the irradiation head portion 122 irradiates substantially uniform ultraviolet rays for measurement in a direction orthogonal to the conveyance direction (transmission area), and each light receiving head portion 124 is generated in each light receiving area. The amount of fluorescence to be received is received and the amount of fluorescence is measured. Other parts (control part, etc.) are the same as in the first embodiment described above, and thus detailed description thereof will not be repeated.

11 is a perspective view illustrating a main part of the irradiation head 122.

12 is a perspective view illustrating an example of the optical module 602 constituting the irradiation head portion 122.

Referring to FIG. 11, as an example, the irradiation head portion 122 includes a plurality of optical modules 602 arranged and arranged in one row. The number of the optical modules 602 to be connected is appropriately selected according to the width of the production line to be applied or the like.

Referring to FIG. 12, each of the optical modules 602 includes a light source 604 for generating ultraviolet rays for measurement, a lens unit 606 for transmitting the ultraviolet rays for measurement generated from the light source 604, and a light source ( 604 and a holder portion 608 supporting the lens portion 606, and a cover portion 610 covering the notch portion of the holder portion 608. The light source 604 is typically composed of an ultraviolet LED (Light Emitting Diode) or the like, and the ultraviolet rays for measurement generated by the light source 604 are diffused by the lens unit 606 and then irradiated to the measurement target. By the structure as mentioned above, the irradiation head part 122 irradiates the substantially uniform ultraviolet-ray for measurement in the direction orthogonal to a conveyance direction.

Other control structures and the like are the same as those in the first embodiment described above, and thus detailed description thereof will not be repeated.

According to embodiment of this invention, in addition to the effect obtained by Embodiment 1 mentioned above, irradiation intensity of the ultraviolet-ray for a measurement in the direction orthogonal to a conveyance direction can be made more uniform.

Second Modification of Embodiment 1

In Embodiment 1 and the first modified example described above, the configuration of generating ultraviolet rays for measurement using a plurality of light sources has been described. In the second modified example of Embodiment 1, the configuration using a single light source is used. Explain.

The schematic structure of the ultraviolet irradiation system which concerns on the 2nd modified example of Embodiment 1 of this invention is the same as that of the ultraviolet irradiation system 100B which concerns on the 1st modified example of Embodiment 1 of this invention shown in FIG. Therefore, detailed description is not repeated.

FIG. 13: is a figure for demonstrating the operation state of the irradiation head part 132 which concerns on the 2nd modified example of Embodiment 1 of this invention. Referring to FIG. 13, the irradiation head unit 132 emits ultraviolet rays for measurement in a line beam shape.

14 is a schematic diagram of an optical system of the irradiation head unit 132. Referring to FIG. 14, the irradiation head unit 132 is similarly to the laser light source 502 generating ultraviolet rays, the collimating lens 504 disposed on the optical axis of the laser light source 502, and the laser light source 502. A diffusing lens 506 disposed on the optical axis of the lens. The ultraviolet light for measurement emitted from the laser light source 502 is converted into parallel light by passing through the collimating lens 504 and guided to the diffusing lens 506. In this diffuser lens 506, the ultraviolet rays for measurement are converted into a diffused beam and emitted to the measurement object.

Other control structures and the like are the same as those in the first embodiment described above, and thus detailed description thereof will not be repeated.

According to embodiment of this invention, in addition to the effect obtained by Embodiment 1 mentioned above, the irradiation intensity of the ultraviolet-ray for a measurement in the direction orthogonal to a conveyance direction can be made more uniform, keeping a structure simple.

[Embodiment 2]

Although Embodiment 1 mentioned above and the modified example demonstrated the case where the multilayer film which bonded two types of sheet-like members using one layer of ultraviolet curing resin as a measurement object was used, in this Embodiment, The case where the hardening state of the multilayer film which has a layer of ultraviolet curable resin is measured is illustrated.

(Structure of Multilayer Film)

First, with reference to FIG. 15, the multilayer film used for a typical flat display is demonstrated.

15 is a diagram illustrating an example of a cross-sectional structure of a representative liquid crystal display.

Referring to Fig. 15, the liquid crystal display is composed of a plurality of layers each of which realizes a specific function. Specifically, the liquid crystal layer 418 sandwiched by the two glass layers 416 is positioned at the center, and the optical compensation sheet 420, the polarizing plate 422, and the antireflection sheet 424 are in that order on the display surface side thereof. Are stacked. On the backlight side of the liquid crystal layer 418, the optical compensation sheet 414, the polarizing plate 412, the brightness enhancement sheet 410, the lens sheet 408, and the light diffusion sheet 40 are laminated in that order. In addition, the backlight includes a light source 400, a light guide plate 402 for changing the propagation direction of light from the light source, and a reflecting plate 404.

The light diffusion sheet 406 diffuses the light from the light source 400 and makes it uniform in the in-plane direction. The lens sheet 408 converges the light diffused by the light diffusion sheet 406 to a predetermined position. The brightness improving sheet 410 increases the brightness by adjusting the color temperature and the like. The polarizing plates 412 and 422 polarize the light from the light source 400 in a predetermined direction according to the alignment direction of the liquid crystal. The optical compensation sheets 414 and 420 are specifically 1/4 wavelength sheets, etc., and adjust an optical phase, a polarization direction, etc. In addition, the antireflection sheet 424 prevents diffuse reflection due to disturbance light such as ambient light.

In addition, the optical compensation sheets 414 and 420, the polarizing plates 412 and 422, etc. are formed by bonding several sheets together in order to implement | achieve the required optical characteristic.

In the process of manufacturing the multilayer film used for such a liquid crystal display, it may be necessary to measure the hardening state of the ultraviolet curable resin in a specific layer in the state in which many sheets are laminated | stacked.

So, in this embodiment, the hardening state in each layer of an ultraviolet curable resin is measured based on the wavelength of the fluorescence which arises from an ultraviolet curable resin.

(Configuration of Curing State Measuring Device)

FIG. 16: is a schematic block diagram of the hardening state measuring apparatus 110A which concerns on Embodiment 2 of this invention.

Referring to FIG. 16, the curing state measuring apparatus 110A includes a head portion 142 and a control portion 114A, measures the spectrum of fluorescence generated by irradiation of ultraviolet rays for measurement, and the fluorescence Based on the spectrum, the hardening state in each layer of an ultraviolet curable resin is judged. It is also effective for separating the fluorescence generated from the ultraviolet curable resin and the fluorescence generated from the sheet itself.

The head unit 142 includes an LED light transmitting module 152, a lens module 154, a spectroscopic module 156, and an analog to digital (AD) conversion unit 158.

The LED floodlight module 152 is, for example, a collimated product obtained by converting an ultraviolet LED 152a for generating a measurement ultraviolet ray having a wavelength of 365 nm and a measurement ultraviolet ray generated from the ultraviolet LED 152a into parallel light. Lens 152b. The ultraviolet rays for measurement that have passed through the collimated lens 152b are guided to the lens module 154.

The lens module 154 includes a dichroic mirror 154a, a dichroic mirror 154a, and a measurement position for reflecting the ultraviolet rays 50 for measurement from the LED light emitting module 152 to guide them to the measurement position. A collimated lens 154b disposed on an optical path therebetween, and a mirror 154c disposed on an extension line of the optical axis of the collimated lens 154b and the dichroic mirror 154a.

In addition to the configuration of the lens module 154 shown in the figure, a half mirror is provided in place of the dichroic mirror 154a, and fluorescence is applied on the optical path between the half mirror and the spectral module 156. You may employ | adopt the structure which provides the filter which blocks an ultraviolet-ray while transmitting.

The ultraviolet ray 50 for measurement emitted from the LED light-transmitting module 152 changes the propagation direction downward from the ground reflected by the dichroic mirror 154a, and passes through the collimated lens 154b to be measured. Is investigated. The fluorescence 52 generated from the measurement target by the measurement ultraviolet light 50 propagates the optical path that is approximately the same as the measurement ultraviolet light 50 in the opposite direction to the measurement ultraviolet light 50, and the collimated lens 154b and Passes through the dichroic mirror 154a and enters the mirror 154c. The fluorescence 52 reflected by the mirror 154c is guided to the spectral module 156.

The spectral module 156 includes a spectral element in which the fluorescence 52 is separated for each wavelength, and an intensity detector 156b for receiving the fluorescence 52 separated for each wavelength and outputting a signal corresponding to the received light intensity. As the intensity detector 156b, a line CCD (Charged Couple Device) or the like is typically used.

By such a structure, the spectrum of the fluorescence which arises from a measurement object according to the ultraviolet-ray for a measurement can be measured.

(Wavelength characteristics of fluorescence)

First, the wavelength characteristic of the fluorescence which arises from an ultraviolet curable resin is demonstrated.

Table 1 shows the result of having investigated the presence or absence of the fluorescence emission with respect to typical ultraviolet curable resin. In Table 1, the result of having investigated the presence or absence of fluorescence emission in the case of irradiating the ultraviolet-ray of wavelength 365nm with respect to each of some ultraviolet curable resin using the spectrum analyzer, and the peak wavelength which concerns on fluorescence emission is shown.

TABLE 1

Photopolymerization initiator Presence or absence of fluorescence emission Peak wavelength Three Bond company 3034 ○: fluorescent emission 420 nm Three bond company 3114 ○: fluorescent emission 470 nm Three bond company 3033 ○: fluorescent emission 450 nm Three bond company 3042 ○: fluorescent emission 460 nm Three Bond company 3065 ○: fluorescent emission 480 nm Three bond company 3064 ○: fluorescent emission 500 nm Three bond company 3113B ○: fluorescent emission 420nm 500nm Three bond company 3114B ○: fluorescent emission 480 nm Three bond company 3065B ○: fluorescent emission 420nm 530nm Three bond company 3134 ○: fluorescent emission 470 nm Chemisil U-1582 made by Chemitech Corporation ○: fluorescent emission 480 nm Chemisil U-1481 made by Chemitech Corporation ○: fluorescent emission 430 nm Chemisil U-1595 made by Chemitech Corporation ○: fluorescent emission 420 nm Chemitech's Chemisil U-406B ○: fluorescent emission 470 nm Chemisil U-1541 made by Chemitech Corporation ○: fluorescent emission 420nm 520nm Chemisil U-1542 made by Chemitech Corporation ○: fluorescent emission 480 nm Chemisil U-1542J made by Chemitech Corporation ○: fluorescent emission 470 nm Chemitech U-403B ○: fluorescent emission 480 nm Chemitech's Chemisil U-1455B ○: fluorescent emission 430 nm Chemisil U-1537 made by Chemitech Corporation ○: fluorescent emission 425nm 510nm Chemitech U-483B ○: fluorescent emission 470 nm Chemitech U-401 ○: fluorescent emission 420nm 500nm

17 is a graph plotting the main luminescence peak of fluorescence generated for various types of ultraviolet curable resins. The horizontal axis of the graph shown in FIG. 17 is a serial number attached to the ultraviolet curable resin made into object for convenience.

Referring to Table 1 and FIG. 17, it was confirmed that fluorescence with a long wavelength was emitted from all ultraviolet curable resins as a target compared with irradiation ultraviolet rays (wavelength 365nm).

Thus, it can be said that the wavelength of the fluorescence which arises from ultraviolet curable resin by irradiation of the ultraviolet-ray for measurement is longer than the wavelength of the ultraviolet-ray for measurement, and that wavelength depends on the kind of ultraviolet curable resin.

Hereinafter, an example of the spectral characteristics of the measured fluorescence will be described with reference to FIGS. 18 to 25. 19 to 25 are directed to ultraviolet curable resins which have been previously irradiated with a predetermined amount of ultraviolet rays to cause a curing reaction, and all of these ultraviolet curable resins are irradiated with ultraviolet rays having a main emission peak of 365 nm. The spectral characteristics of the measured fluorescence in the case are shown.

Fig. 18 shows the spectral characteristics of the ultraviolet rays for measurement (main emission peak: 365 nm).

Fig. 19 shows the spectral characteristics of 3034 manufactured by Three Bonds. FIG. 20 shows the spectral characteristics of Chemisil U-1582 manufactured by Chemitech. Fig. 21 shows the spectral characteristics of Chemisil U-1481 manufactured by Chemitech. Fig. 22 shows the spectral characteristics of Chemisil U-1595 manufactured by Chemtech. 23 shows the spectral characteristics of Chemisil U-1542 manufactured by Chemitech Co., Ltd. Fig. 24 shows the spectral characteristics of Chemitech Co., Ltd. Chemisil U-1542J. 25 shows the spectral characteristics of Chemisil U-1455B.

Compared with the spectral characteristics shown in FIG. 18, it turns out that the main emission peak exists in another wavelength in the spectral characteristics shown in FIGS. 19-25. In this way, by measuring the spectrum of the fluorescence generated from the ultraviolet curable resin, the type of the ultraviolet curable resin can be specified, and the curing state of the ultraviolet curable resin can be determined based on the absolute value of the main emission peak. Can be.

That is, also about the multilayer film containing the layer of several ultraviolet curable resin, if the kind of each ultraviolet curable resin can be specified, the hardening state of each layer will be selected by selectively extracting a corresponding wavelength from the spectrum of the fluorescence which arises. You can judge. However, it may be difficult to judge the hardening state in any one manufacturing process with respect to the multilayer film laminated | sequentially laminated | stacked through several manufacturing processes. This is because the type of ultraviolet curable resin already used cannot be specified when the content of the process in the previous step is not clear.

Therefore, in the ultraviolet irradiation system according to the present embodiment, the spectrum of fluorescence is respectively measured at the positions before and after irradiation of ultraviolet rays for promoting the curing reaction with respect to the ultraviolet curable resin, and based on the difference of this spectrum, The hardening state of the ultraviolet curable resin made into the object is judged. Thereby, the hardening reaction of an ultraviolet curable resin can be evaluated in the process made into the object, without depending on the process in a previous process.

(Overall configuration)

FIG. 26: is a schematic block diagram of the ultraviolet irradiation system 100C which concerns on Embodiment 2 of this invention.

Referring to FIG. 26, in the ultraviolet irradiation system 100C according to the present embodiment, a plurality of head portions 142 are disposed on each of the upstream side and the downstream side of the ultraviolet irradiation unit 106. That is, the plurality of head parts 142 disposed upstream of the ultraviolet irradiation part 106 measures the spectrum of fluorescence in the initial state before the curing reaction of the UV adhesive 206, and the downstream side of the ultraviolet irradiation part 106. The plurality of head portions 142 disposed at the edges measure the spectrum of fluorescence after the curing reaction of the UV adhesive 206.

(Control structure)

27 is a block diagram showing a control structure of the control unit according to the second embodiment of the present invention. In this embodiment, the good / bad of a hardened state is judged based on the two fluorescence spectra measured before and after irradiation of the ultraviolet-ray for accelerating hardening reaction of an ultraviolet curable resin. Further, before and after irradiation of ultraviolet rays for promoting the curing reaction, each head portion 142 is disposed so as to receive the amount of fluorescence from a common track. In addition, although FIG. 27 typically shows a configuration for determining the good / bad of the hardened state in one track, the control shown in FIG. 27 when the head portion 142 is arranged over a plurality of tracks is shown. A plurality of structures are provided.

Referring to FIG. 27, the control unit according to the present embodiment includes wavelength selection units 362 and 364, a subtraction unit 366, and a comparison unit 368. The wavelength selection unit 362 is formed of an ultraviolet curable resin (UV adhesive 206) as a target among the fluorescence spectra measured by the head unit 142 disposed downstream of the ultraviolet irradiation unit 106 (FIG. 26). The intensity value corresponding to the specific wavelength? Corresponding to the main emission peak is selected and output. Similarly, the wavelength selection part 364 is the ultraviolet curable resin (UV adhesive 206) which becomes an object in the fluorescence spectrum measured by the head part 142 arrange | positioned upstream of the ultraviolet irradiation part 106 (FIG. 26). Selects and outputs an intensity value corresponding to a specific wavelength? Here, the wavelength λ is set by the user or by a command from a higher control device or the like. Moreover, you may output the value which integrated the intensity value contained in the predetermined range centering on the specific wavelength (lambda).

The subtractor 366 subtracts the output value from the wavelength selector 364 from the output value from the wavelength selector 362. That is, the subtraction part 366 outputs from the wavelength selection part 362 the initial value of the intensity value of the specific wavelength (lambda) measured by the head part 142 arrange | positioned upstream of the ultraviolet irradiation part 106 as an initial value. Subtract from the tooth. Thereby, even when the ultraviolet curable resin is contained in the 1st sheet 204 or the 2nd sheet 202 previously, the value output from the subtraction part 366 excludes the element which depends on such an initial condition.

The comparison unit 368 compares the output value output from the subtraction unit 366 with the threshold value α3, and if the output value exceeds the threshold value α3, determines that the curing state is good. It is determined that the state is bad. This threshold value α3 can also be experimentally obtained in advance.

In addition to the above-described method, after calculating the difference between the fluorescence spectrum measured on the upstream side and the fluorescence spectrum measured on the downstream side, the peak wavelength may be obtained or the intensity of a specific wavelength range may be obtained.

According to embodiment of this invention, in addition to the effect obtained by Embodiment 1 mentioned above, a hardening state can also be judged also about the multilayer film containing a some ultraviolet curable resin layer. That is, specific ultraviolet curable resin can be specified based on the component of the specific wavelength of the fluorescence which generate | occur | produces according to the kind of ultraviolet curable resin. Moreover, even if it is unknown what kind of ultraviolet curable resin is contained, the hardening state of this ultraviolet curable resin is judged based on the fluorescence measured before and after the hardening reaction of the newly apply | coated ultraviolet curable resin. Therefore, the quality of the multilayer film used for the flat display manufactured by many via a process can be improved.

[Other Aspects]

(Calibration between heads)

In the case where a plurality of head portions are arranged in a direction orthogonal to the conveying direction, in order to check the variation in the state of hardening in this orthogonal direction, an ultraviolet light source for generating the ultraviolet rays 50 for measurement in each head portion, or generation It is necessary to match the characteristics of the light receiving element for receiving fluorescence. That is, it is because there exists a possibility that it may be erroneously judged that there exists a deviation in hardening state by the deviation of these elements. In addition, as described above, the light-receiving element disposed on the upstream side also in the configuration for determining the good / bad of the curing state based on the difference between the fluorescence spectrum measured on the upstream side and the fluorescence spectrum measured on the downstream side. It is effective to reduce the deviation between the light receiving elements arranged on the downstream side.

Therefore, in order to trim the characteristics of these head portions, it is preferable to employ a calibration method as described below.

28 is a diagram for explaining a method of calibrating a plurality of head portions 112.

Referring to Fig. 28, a typical calibration method is a method in which a sample having a known amount of fluorescence to be generated in advance is used. Specifically, the reference sample 1 and the reference sample 2 which have the width | variety (or line width) in which the some head part 112 is arrange | positioned are prepared. Here, the reference sample 1 selects a relatively small amount of generated fluorescence, and the reference sample 2 selects a relatively large amount of generated fluorescence. Typically, the reference sample 1 is made of metal, and the reference sample 2 is made of organic material.

And each reference sample is arrange | positioned in the irradiation area (light receiving area) of the head part 112, and the fluorescent amount is measured in each.

It is a figure for demonstrating the method of correcting from the measured fluorescent amount.

Referring to Fig. 29, offset calibration is performed based on the difference between the measured value to be measured from the reference sample 1 and the actually measured value. Further, a gain calibration is performed to adjust the detection sensitivity of the fluorescence in the head 112 so that the measured value to be measured from the reference sample 2 coincides with the actually measured value.

In addition, offset correction and gain correction are realized by adjusting the amplifier circuit 32 shown in FIG.

(Temperature correction)

Receiving ultraviolet rays for measurement, the fluorescence generated from the ultraviolet curable resin has a temperature dependency. That is, depending on the temperature of the multilayer film containing the ultraviolet curable resin, the amount of fluorescence generated fluctuates. Therefore, in order to avoid misjudgment caused by such fluctuations, the threshold value used in each control structure or the like is applied to the temperature of such multilayer film. It is desirable to optimize accordingly.

(Injection apparatus)

Although the above-mentioned embodiment demonstrated the case where the hardening state measuring apparatus is being fixed with respect to a line, you may make it possible to move a hardening state measuring apparatus itself freely using an X-Y stage or the like.

It should be thought that embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is shown by above-described not description but Claim, and it is intended that the meaning of a claim and equality and all the changes within a range are included.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic block diagram of the ultraviolet irradiation system 100A provided with the hardening state measuring apparatus which concerns on Embodiment 1 of this invention.

2 is a schematic external view of a curing state measuring apparatus 110 according to Embodiment 1 of the present invention.

3 is a schematic configuration diagram of a curing state measuring device 110 according to Embodiment 1 of the present invention.

4 is a diagram schematically showing an irradiation area of the ultraviolet ray for measurement 50 irradiated from the head portion 112 of the curing state measuring device according to Embodiment 1 of the present invention.

5 is a diagram for explaining the effect of irradiation unevenness of ultraviolet rays for measurement.

6 is a graph showing the relationship between the irradiation time and the amount of fluorescence generated when ultraviolet rays having a predetermined intensity are irradiated with a general ultraviolet curable resin.

7 is a block diagram showing a control structure of the control unit 114 according to Embodiment 1 of the present invention.

FIG. 8 is a block diagram showing a control structure for determining curing good / failure according to Embodiment 1 of the present invention. FIG.

9 is a schematic configuration diagram of an ultraviolet irradiation system 100B including a curing state measuring device according to a first modification of Embodiment 1 of the present invention.

10 is a view for explaining the positional relationship between the irradiation head 122 and the light receiving head 124.

11 is a perspective view illustrating a main part of the irradiation head 122.

12 is a perspective view illustrating an example of an optical module 602 constituting the irradiation head portion 122.

Fig. 13 is a view for explaining an operating state of the irradiation head portion 132 according to the second modification of the first embodiment of the present invention.

14 is a schematic view of an optical system of the irradiation head portion 132.

15 is a diagram illustrating an example of a cross-sectional structure of a representative liquid crystal display.

16 is a schematic configuration diagram of a hardened state measuring device 110A according to Embodiment 2 of the present invention.

17 is a graph plotting the main luminescence peak of fluorescence generated for various kinds of ultraviolet curing resins.

18 is a diagram showing spectral characteristics of ultraviolet rays for measurement (main emission peak: 365 nm).

Fig. 19 is a diagram showing the spectral characteristics of Three Bonds Co., Ltd. 3034.

Fig. 20 is a diagram showing the spectral characteristics of Chemisil U-1582 manufactured by Chemtech.

Fig. 21 shows the spectral characteristics of Chemisil U-1481 manufactured by Chemtech.

Fig. 22 is a diagram showing the spectral characteristics of Chemitec U-1595.

The figure which shows the spectral characteristic of the chemical compound Chemisil U-1542.

The figure which shows the spectral characteristic of the chemical compound Chemisil U-1542J.

Fig. 25 shows the spectral characteristics of Chemisil U-1455B manufactured by Chemitech Co., Ltd .;

Fig. 26 is a schematic configuration diagram of an ultraviolet irradiation system 100C according to Embodiment 2 of the present invention.

Fig. 27 is a block diagram showing a control structure of a control unit according to the second embodiment of the present invention.

28 is a diagram for explaining a method of calibrating a plurality of head portions 112.

29 is a diagram for explaining a method for performing calibration from the measured amount of fluorescence.

(Explanation of symbols for the main parts of the drawing)

20: Light transmitting drive circuit 22: Light transmitting element

24: half mirror 26: optical filter

28: light receiving element 30: high pass filter circuit

32: amplification circuit 34: sample hold circuit

36: analog-to-digital conversion unit 38: panel unit

42: display unit 44: operation unit

46: storage unit 48: network interface unit

50 UV for measurement 52 Fluorescence

100A, 100B, 100C: ultraviolet irradiation system 102, 104: feeding roller

106: ultraviolet irradiation unit 110, 110A: curing state measuring device

112, 142: head portion 114, 114A: control portion

114a: control boards 122, 132: irradiation head

124: light receiving head 152: light transmitting module

152a: UV LED 152b: collimated lens

154 lens module 154a dichroic mirror

154b: collimated lens 154c: mirror

156: Spectral Module 156b: Intensity Detector

158: AD conversion unit 202, 204: sheet

206: UV curable resin (UV adhesive) 302, 316, 366: subtraction part

304, 318, 368: comparison unit 312: maximum value extraction unit

314: minimum value extraction section 362, 364: wavelength selection section

400: light source 402: light guide plate

404: reflector 406: light diffusion sheet

408 lens sheet 410 brightness enhancement sheet

412 and 422 polarizers 414 and 420 optical compensation sheet

416: glass layer 418: liquid crystal layer

424: antireflection sheet 502: laser light source

504: collimated lens 506: diffused lens

602: optical module 604: light source

606: lens portion 608: holder portion

610: cover part

Claims (7)

As a hardening state measuring apparatus which measures the hardening state of the ultraviolet curable resin containing the main body which consists of at least one of a monomer and an oligomer, and a photoinitiator, First irradiation means for irradiating ultraviolet rays for exciting said ultraviolet curable resin, First light-receiving means for receiving fluorescence generated from said ultraviolet curable resin by irradiation of said ultraviolet rays; Determination means for judging whether the curing state of the ultraviolet curable resin is good or bad, based on the amount of fluorescence measured by the first light receiving means; The said ultraviolet curable resin is interposed between at least 2 sheet-like members, The said 1st irradiation means irradiates the said ultraviolet curable resin to the said ultraviolet curable resin through one said sheet-like member, The hardening state measuring apparatus characterized by the above-mentioned. The method of claim 1, The at least two sheet-like members are continuously conveyed along a predetermined conveyance direction, In the conveyance path | route of the said at least 2 sheet-like member, the hardening apparatus which irradiated the ultraviolet-ray for promoting hardening reaction in the said ultraviolet curable resin is arrange | positioned, The said 1st irradiation means and the said 1st light receiving means consist of the some head part arranged in the direction orthogonal to the said conveyance direction, The hardening state measuring apparatus characterized by the above-mentioned. The method of claim 2, The said determination means judges the good / bad of the said hardening state based on the magnitude | size of the fluorescent amount from the ultraviolet curable resin after passing through the said hardening apparatus, The hardening state measuring apparatus characterized by the above-mentioned. The method of claim 2, The said determination means judges the good / bad of the said hardened state based on the deviation of the fluorescent amount in the direction orthogonal to the said conveyance direction, The hardened state measuring apparatus characterized by the above-mentioned. The method of claim 2, 2nd irradiation means which irradiates the ultraviolet-ray for excitation with respect to the ultraviolet curable resin before passing through the said hardening apparatus, Further comprising second light receiving means for receiving fluorescence generated from the ultraviolet curable resin by irradiation of ultraviolet light by the second irradiation means, The judging means judges the good / bad of the cured state of the ultraviolet curable resin based on the amount of fluorescence measured by the first light receiving means and the amount of fluorescence measured by the second light receiving means. Curing state measuring device. The method according to claim 1 or 2, The first light receiving means includes first spectroscopic means for acquiring the spectrum of the fluorescence by spectroscopy of the fluorescence, The judging means judges the good / bad of the cured state of the ultraviolet curable resin based on the intensity value of a specific wavelength corresponding to the ultraviolet curable resin in the spectrum of the fluorescence obtained by the first spectroscopic means. Hardening state measuring apparatus characterized by the above-mentioned. The method of claim 6, 2nd irradiation means which irradiates the ultraviolet-ray for excitation with respect to the ultraviolet curable resin before passing through the said hardening apparatus, And further comprising second spectroscopic means for acquiring the spectrum of the fluorescence by receiving fluorescence generated from the ultraviolet curable resin by irradiation of ultraviolet rays by the second irradiation means, The said judging means judges the good / bad of the hardened state of the said ultraviolet curable resin based on the spectrum acquired by the said 1st spectroscopy means, and the spectrum acquired by the said 2nd spectroscopy means, The hardening characterized by the above-mentioned. Condition measuring device.

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