Method for measuring chromaticity of wavelength conversion member, chromaticity measurement device, and manufacturing method

Abstract

A wavelength conversion member 2 containing a phosphor has an adhesive sheet 7 laminated and affixed thereon to form a laminate 10. A light projection unit 4 that emits light L is disposed on the adhesive sheet 7 side of the laminate 10, and a light reception unit 5 that receives the light L is arranged on the wavelength conversion member 2 side of the laminate 10. In this state, the laminate 10 is irradiated with the light L from the light projection unit 4, and chromaticity of the wavelength conversion member 2 is measured on the basis of the light L from the laminate 10 received by the light reception unit 5. At that time, a tip portion of the light projection unit 4 is brought into contact with the adhesive sheet 7, at a position corresponding to the wavelength conversion member 2.

Description

Method for measuring the chromaticity of a wavelength conversion component, a chromaticity measuring apparatus, and a method for manufacturing it.

[0001] The present invention relates to a method for measuring the chromaticity of a wavelength conversion member, a chromaticity measuring apparatus, and a method for manufacturing such a member.

[0002] A wavelength conversion component containing a phosphor is used, for example, in a white light-emitting device to obtain white light from blue light emitted from a blue light source. In this case, the phosphor in the wavelength conversion component absorbs a portion of the blue light (excitation light) emitted from the blue light source and converts it into yellow light (converted light). White light is reproduced by mixing the yellow light converted by the phosphor with the remaining blue light emitted from the blue light source.

[0003] However, due to variations in the concentration of phosphors in the wavelength conversion material and the thickness of the wavelength conversion material, the chromaticity of the white light reproduced by mixing the yellow light (converted light) and the blue light (excitation light) may fall outside the desired range.

[0004] For example, Patent Document 1 discloses a method for pre-measuring the chromaticity of a wavelength conversion member before mounting it in a white light-emitting device. Specifically, in this document, with the wavelength conversion member held by an adhesive sheet, a light-emitting unit (light source) that emits light is placed on the adhesive sheet side, and a light-receiving unit (spectrometer) that receives light is placed on the wavelength conversion member side. In this state, light is irradiated from the light-emitting unit to the wavelength conversion member via the adhesive sheet, and the chromaticity of the wavelength conversion member is measured based on the light received by the light-receiving unit from the wavelength conversion member.

[0005] Japanese Patent Publication No. 2017-90388

[0006] In Patent Document 1, the light-emitting unit is positioned below the adhesive sheet, spaced apart. As a result, wrinkles and flexing occur in the adhesive sheet, and the position of the wavelength conversion member held by the adhesive sheet is prone to fluctuation. Consequently, each time the chromaticity of the wavelength conversion member is measured, the distance between the light-emitting unit and the wavelength conversion member fluctuates, which may lead to a decrease in the accuracy of the chromaticity measurement.

[0007] The present invention aims to accurately measure the chromaticity of a wavelength conversion member.

[0008] (1) The present invention, devised to solve the above problems, is a method for measuring the chromaticity of a wavelength conversion member, wherein a light-emitting part is placed on the first main surface side of a laminate formed by laminating and attaching a holder to a wavelength conversion member containing a phosphor, and a light-receiving part is placed on the second main surface side located opposite the first main surface of the laminate, and light is irradiated onto the laminate from the light-emitting part, and the chromaticity of the wavelength conversion member is measured based on the light from the laminate received by the light-receiving part, characterized in that the tip of the light-emitting part is brought into contact with the first main surface of the laminate at a position corresponding to the wavelength conversion member.

[0009] In this way, the tip of the light-emitting section contacts the first main surface of the laminate at the position corresponding to the wavelength conversion member, thus reducing fluctuations in the distance between the light-emitting section and the wavelength conversion member. As a result, the chromaticity of the wavelength conversion member can be measured with high accuracy.

[0010] (2) In the configuration of (1) above, the holder is preferably arranged on the first main surface side of the laminate, the wavelength conversion member is preferably arranged on the second main surface side of the laminate, and the tip of the light-emitting part is preferably in contact with the holder.

[0011] In this way, the tip of the light-emitting part indirectly contacts the wavelength conversion member via the holder. Therefore, it is possible to prevent damage to the wavelength conversion member caused by contact with the tip of the light-emitting part.

[0012] (3) In the configuration of (1) or (2) above, it is preferable that the laminate is arranged such that the first main surface side faces downward and the second main surface side faces upward.

[0013] In this way, gravity acting on the laminate stabilizes the contact between the first main surface of the laminate and the tip of the light-emitting part.

[0014] (4) In the configuration of (3) above, it is preferable that the portion of the first main surface of the laminate that is in contact with the tip of the light-emitting part is pushed up by the tip of the light-emitting part so that it is located at a higher position than the portion that is not in contact with the tip of the light-emitting part.

[0015] In this way, the first main surface of the laminate is pressed against the tip of the light-emitting part, further stabilizing the contact between the first main surface of the laminate and the tip of the light-emitting part.

[0016] (5) In any of the configurations (1) to (4) above, the area of ​​the light-emitting part that emits light at the tip of the light-emitting part is 0.19 mm ２ It is preferable that the above conditions are met.

[0017] In this way, the range of light irradiated onto the wavelength conversion component becomes sufficiently wide compared to the size of the phosphor. Therefore, even if there are local concentration differences in the phosphor within the wavelength conversion component, the accuracy of the chromaticity measurement of the wavelength conversion component is less likely to decrease.

[0018] (6) In any of the configurations (1) to (5) above, it is preferable that the entire light-emitting portion that emits light from the tip of the light-emitting portion is covered by the wavelength conversion member, with the tip of the light-emitting portion in contact with the first main surface of the laminate.

[0019] If light emitted from the light-emitting unit is received by the light-receiving unit without passing through the wavelength conversion member, this can reduce the accuracy of the chromaticity measurement of the wavelength conversion member. However, with the above configuration, the situation in which light emitted from the light-emitting unit is received by the light-receiving unit without passing through the wavelength conversion member can be reliably suppressed.

[0020] (7) In the configuration of (6) above, when the tip of the light-emitting part is in contact with the first main surface of the laminate, it is preferable that the portion of the tip of the light-emitting part, excluding the light-emitting part, has a protruding portion that extends outward from the wavelength conversion member.

[0021] In this way, the entire wavelength conversion component comes into direct or indirect contact with the tip of the light-emitting unit via a holder. Therefore, it is possible to prevent light emitted from the tip of the light-emitting unit from leaking out from unintended parts of the wavelength conversion component, which would reduce the accuracy of the chromaticity measurement of the wavelength conversion component.

[0022] (8) In any of the configurations (1) to (7) above, the light-emitting section comprises a light source that generates light and an optical fiber that guides the light from the light source, and it is preferable that the tip of the optical fiber is in contact with the first main surface of the laminate.

[0023] This makes it easier to bring the tip of the light-emitting part into contact with the first main surface of the laminate.

[0024] (9) In any of the configurations (1) to (8) above, it is preferable that the holding member is an adhesive sheet.

[0025] If it is an adhesive sheet, the wavelength conversion member can be easily held. Also, the adhesive sheet is a material that is prone to wrinkles and bending. Therefore, if no countermeasures are taken, the distance between the light projecting part and the wavelength conversion member is likely to vary. Thus, the present invention that can suppress the influence of such variation in the distance between the light projecting part and the wavelength conversion member becomes particularly useful.

[0026] (10) The present invention devised to solve the above problems is arranged on the first main surface side of a laminate formed by laminating and attaching a holding member to a wavelength conversion member containing a phosphor, and includes a light projecting part that emits light, and a light receiving part that is arranged on the second main surface side opposite to the first main surface of the laminate and receives light. Light is irradiated from the light projecting part to the laminate, and based on the light from the laminate received by the light receiving part, it is a chromaticity measuring device for measuring the chromaticity of the wavelength conversion member, characterized by comprising a moving mechanism that relatively moves the tip of the light projecting part with respect to the laminate and contacts the tip of the light projecting part with the first main surface of the laminate at a position corresponding to the wavelength conversion member.

[0027] By doing so, due to the moving mechanism, the tip of the light projecting part contacts the first main surface of the laminate at a position corresponding to the wavelength conversion member, so the distance between the light projecting part and the wavelength conversion member is less likely to vary. As a result, the chromaticity of the wavelength conversion member can be accurately measured.

[0028] (11) The present invention devised to solve the above problems is a method for manufacturing a wavelength conversion member containing a phosphor, characterized by including a step of measuring the chromaticity of the wavelength conversion member by a chromaticity measuring method having any of the configurations (1) to (9) above.

[0029] By doing so, the same operational effects as the corresponding configurations above can be enjoyed.

[0030] According to the present invention, the chromaticity of the wavelength conversion member can be accurately measured.

[0031] This is a longitudinal cross-sectional view showing a chromaticity measuring device according to the first embodiment of the present invention. This is a plan view showing the support portion of the chromaticity measuring device in Figure 1. This is a longitudinal cross-sectional view showing the state in which the tip of the light-emitting part is raised by the vertical movement mechanism in the chromaticity measuring device in Figure 1. This is a longitudinal cross-sectional view showing an enlarged view of the area around the tip of the light-emitting part in Figure 3. This is a flowchart of the method for manufacturing a wavelength conversion member according to the first embodiment. This is a longitudinal cross-sectional view showing an enlarged view of the area around the tip of the light-emitting part in a chromaticity measuring device according to the second embodiment of the present invention. This is a plan view showing the initial state of the cutting process included in the method for manufacturing a wavelength conversion member according to the third embodiment of the present invention. This is a plan view showing the middle state of the cutting process included in the method for manufacturing a wavelength conversion member according to the third embodiment of the present invention. This is a plan view showing the final state of the cutting process included in the method for manufacturing a wavelength conversion member according to the third embodiment of the present invention. This is a plan view showing the chromaticity measuring process included in the method for manufacturing a wavelength conversion member according to the third embodiment of the present invention.

[0032] Embodiments of the present invention will be described below with reference to the drawings. In each embodiment, corresponding components will be denoted by the same reference numerals, and redundant explanations may be omitted. When only a part of the configuration is described in each embodiment, the configuration of other embodiments described earlier can be applied to the other parts of that configuration. Furthermore, not only the combinations of configurations explicitly stated in the description of each embodiment, but also the configurations of multiple embodiments can be partially combined even if not explicitly stated, as long as there are no particular problems with the combination.

[0033] (First Embodiment) As shown in Figures 1 to 4, the chromaticity measuring device 1 according to this embodiment is for measuring the chromaticity of a wavelength conversion member 2 containing a phosphor. The chromaticity measuring device 1 comprises a support part 3 that supports the wavelength conversion member 2, a light-emitting part 4 that irradiates the wavelength conversion member 2 with light L, a light-receiving part 5 that receives the light L from the wavelength conversion member 2, and a processing part 6 that measures the chromaticity of the wavelength conversion member 2 based on the light L received by the light-receiving part 5.

[0034] The wavelength conversion member 2 is composed of a rectangular glass plate containing a phosphor. The shape of the wavelength conversion member 2 is not particularly limited and may be circular, for example.

[0035] In this embodiment, a case where the phosphor in the wavelength conversion member 2 has a function of absorbing a part of blue light (excitation light) and converting it into yellow light (converted light) will be described. In this case, when the wavelength conversion member 2 is irradiated with blue light, the yellow light converted by the phosphor and the remaining blue light not absorbed by the phosphor are mixed to obtain white light (reproduced light). Note that the types of the excitation light and the phosphor (that is, the colors of the excitation light and the converted light) can be appropriately changed according to the color of the reproduced light required.

[0036] The thickness of the wavelength conversion member 2 is preferably, for example, 0.03 mm to 0.4 mm, and more preferably 0.05 mm to 0.2 mm. The size of the wavelength conversion member 2 is preferably, for example, 0.5 mm × 0.5 mm to 5 mm × 5 mm, and more preferably 0.7 mm × 0.7 mm to 2 mm × 2 mm. The outer shape of the wavelength conversion member 2 may be square or rectangular.

[0037] The support portion 3 includes an adhesive sheet 7, an annular holding frame 8 that holds the periphery of the adhesive sheet 7, and a horizontal movement mechanism 9 that holds the holding frame 8 so as to be movable in the horizontal direction.

[0038] The adhesive sheet 7 is a holding body that holds the wavelength conversion member 2. The adhesive sheet 7 is preferably made of a material that can transmit the light L emitted from the light projecting portion 4 and has elasticity. The transmittance of the adhesive sheet 7 to blue light (for example, wavelength 445 nm to 455 nm) is preferably 20 to 100%. The absorption rate of the adhesive sheet 7 to blue light (for example, wavelength 445 nm to 455 nm) is preferably 0% to 20%. The adhesive sheet 7 preferably includes, for example, a resin sheet such as a polyolefin or a polyvinyl chloride as a base material.

[0039] A wavelength conversion member 2 is attached to the adhesive sheet 7, forming a laminate 10 consisting of the wavelength conversion member 2 and the adhesive sheet 7. The laminate 10 is arranged such that the adhesive sheet 7 side, which constitutes the first main surface of the laminate 10, faces downward, and the wavelength conversion member 2 side, which constitutes the second main surface of the laminate 10, faces upward. In this embodiment, multiple wavelength conversion members 2 are attached to the adhesive sheet 7 in a matrix with intervals between them. Alternatively, the multiple wavelength conversion members 2 may be arranged on the adhesive sheet 7 without any gaps between them.

[0040] The number of wavelength conversion members 2 attached to the adhesive sheet 7 is preferably, for example, 100 to 20,000. The spacing C between adjacent wavelength conversion members 2 is preferably, for example, 0 mm to 5 mm, more preferably 0.2 to 2 mm, and most preferably 0.4 mm to 1 mm. If the spacing C is too large, the number of wavelength conversion members 2 that can be mounted tends to decrease.

[0041] The light-emitting unit 4 is located on the adhesive sheet 7 side (below the laminate 10) of the laminate 10. The light-emitting unit 4 includes a light source 11 that generates light L and an optical fiber 12 that guides the light L from the light source 11.

[0042] The light source 11 is composed of, for example, a halogen lamp, a laser element, or an LED, and generates blue excitation light as light L.

[0043] The tip portion 12a of the optical fiber 12 constitutes the tip portion of the light-emitting portion 4. The tip portion 12a of the optical fiber 12 is provided with a light-emitting portion 12aa that emits light L. The light L emitted from the light-emitting portion 12aa is irradiated onto the wavelength conversion member 2 via the adhesive sheet 7. The portion of the optical fiber 12 other than the tip portion 12a is flexible.

[0044] As shown in Figure 4, the tip portion 12a of the optical fiber 12 includes a cylindrical core 13 that guides light L from the light source 11, a cylindrical cladding 14 arranged on the outer circumference of the core 13, a cylindrical ferrule 15 that holds the core 13 and cladding 14 inside, and a metal cover 16 that covers the ferrule 15.

[0045] The light-emitting portion 12aa is formed from the tip surface of the core 13. The core diameter D of the core 13 is preferably 0.5 mm or more, more preferably 0.5 mm to 0.9 mm, and even more preferably 0.6 mm to 0.8 mm. In other words, the area of ​​the light-emitting portion 12aa is 0.19 mm². ２ Preferably, it is 0.19 mm or more. ２ ~0.64 mm ２ It is more preferable that it be 0.28 mm ２ ~0.5mm ２ It is even more preferable that this is the case. Furthermore, the area of ​​the light-emitting section 12aa is preferably 30% to 100% of the area of ​​the wavelength conversion member 2 to be measured, more preferably 40% to 98%, and even more preferably 50% to 95%. The cover 16 is provided with a window 16a through which the light L emitted from the light-emitting section 12aa is transmitted.

[0046] As shown in Figure 1, the tip 12a of the optical fiber 12 is held so as to be movable in the vertical direction by the vertical movement mechanism 17. As shown in Figures 3 and 4, when measuring the chromaticity of the wavelength conversion member 2, the vertical movement mechanism 17 raises the tip 12a of the optical fiber 12 to a position corresponding to the wavelength conversion member 2 to be measured, and brings the tip 12a of the optical fiber 12 into contact with the adhesive sheet 7. The portion of the tip 12a of the optical fiber 12 that contacts the adhesive sheet 7 (the tip surface) is composed of a horizontal plane. In this embodiment, the horizontal movement mechanism 9 moves the wavelength conversion member 2 to be measured to directly above the tip 12a of the optical fiber 12.

[0047] With the tip 12a of the optical fiber 12 in contact with the adhesive sheet 7, the entire light-emitting portion 12aa is covered by the wavelength conversion member 2 via the adhesive sheet 7. In other words, the light-emitting portion 12aa is smaller than the inscribed circle of the wavelength conversion member 2 and does not protrude outside the wavelength conversion member 2.

[0048] With the tip 12a of the optical fiber 12 in contact with the adhesive sheet 7, a protruding portion 12ab that protrudes outside the wavelength conversion member 2 is provided in a portion of the tip 12a of the optical fiber 12 excluding the light emitting portion 12aa. The protruding portion 12ab is composed of at least one of the clad 14, the ferrule 15, and the cover 16 (the cover 16 in the illustrated example).

[0049] The light receiving portion 5 is disposed on the wavelength conversion member 2 side (above the laminate 10) of the laminate 10. The light receiving portion 5 receives the light L from the wavelength conversion member 2. The light L received by the light receiving portion 5 is a light in which blue light (excitation light) and yellow light (converted light) converted by the phosphor are mixed.

[0050] The processing unit 6 includes a computer and calculates the chromaticity of the wavelength conversion member 2 based on the light received by the light receiving portion 5.

[0051] Next, a method for manufacturing the wavelength conversion member according to the present embodiment will be described. In the description of the method for manufacturing the wavelength conversion member, a method for measuring the chromaticity of the wavelength conversion member will also be described, but the method for measuring the chromaticity of the wavelength conversion member can also be implemented alone.

[0052] As shown in FIG. 5, the method for manufacturing the wavelength conversion member according to the present embodiment includes a raw material manufacturing step S1 for manufacturing a raw material of the wavelength conversion member 2, a cutting step S2 for cutting the raw material to obtain a plurality of wavelength conversion members 2, and a chromaticity measurement step S3 for measuring the chromaticity of the wavelength conversion member 2.

[0053] In the raw material manufacturing step S1, a plate-like raw material is manufactured by firing an ingot obtained by pressurizing or molding a mixture containing glass powder and phosphor powder and then slicing it. In this case, the raw material is composed of a large glass plate containing a phosphor. The method for manufacturing the raw material is not particularly limited. For example, the raw material may be manufactured by stretching a mixture containing glass powder and phosphor powder into a sheet shape on a plane such as a table using a spatula or the like and then firing it.

[0054] Examples of the glass powder include ZnO—B ２ O ３ —SiO ２ -based glass powder, SiO ２-B ２ O ３ - RO-based glass powder (R is at least one selected from the group consisting of Mg, Ca, Sr, and Ba), SiO ２ -TiO ２ -Nb ２ O ５ -R' ２ O-based glass powder (R' is at least one selected from the group consisting of Li, Na, and K) and SnO-P ２ O ５ A type of glass powder selected from the group consisting of glass powders is used.

[0055] As the phosphor powder, at least one inorganic phosphor powder selected from the group consisting of oxides (including garnet-based powders such as YAG powder), nitrides, oxynitrides, sulfides, oxysulfides, halides (such as halophosphate chloride powder), and aluminates is used. Specifically, as an inorganic phosphor powder that converts blue excitation light to yellow conversion light (fluorescence), (Y, Gd) ３ (Al, Ga) ５ O １２ : Ce, La ３ Si ６ N １１ :Ce,Ca-α-sialon:Eu,Li ２ SrSiO ４ Examples include the EU.

[0056] In cutting step S2, the original material is attached to an adhesive sheet and then cut into multiple small pieces by dicing or the like. This yields multiple wavelength conversion members 2 from the original material. In this case, the wavelength conversion members 2 are made up of small glass plates containing phosphors.

[0057] The chromaticity measurement step S3 corresponds to the method for measuring the chromaticity of the wavelength conversion member. The chromaticity measurement device 1 described above is used in the chromaticity measurement step S3.

[0058] As shown in Figures 1 and 2, in the chromaticity measurement step S3, first, multiple wavelength conversion members 2 are attached to the adhesive sheet 7 of the support part 3 at intervals. The adhesive sheet 7 may be the same adhesive sheet used in the cutting step S2, but in this embodiment, a different adhesive sheet is used than the one used in the cutting step S2.

[0059] Next, with the tip 12a of the optical fiber 12 (the tip of the light-emitting unit 4) separated from the laminate 10 of the adhesive sheet 7 and the wavelength conversion member 2, the holding frame 8 is moved by the horizontal movement mechanism 9 so that one of the multiple wavelength conversion members 2 to be measured is positioned directly above the light-emitting unit 4.

[0060] Subsequently, as shown in Figures 3 and 4, the tip 12a of the optical fiber 12 is raised by the vertical movement mechanism 17 to contact the adhesive sheet 7 at a position corresponding to the wavelength conversion member 2 to be measured. At this time, the tip 12a of the optical fiber 12 pushes up the adhesive sheet 7 at the position corresponding to the wavelength conversion member 2 to be measured. As a result, the portion of the adhesive sheet 7 that is in contact with the tip 12a of the optical fiber 12 is positioned higher than the portion of the adhesive sheet 7 that is not in contact with the tip 12a of the optical fiber 12.

[0061] In this state, light L is emitted from the light emission section 12aa of the optical fiber 12, and the light L is irradiated onto the wavelength conversion member 2 via the adhesive sheet 7. The light L from the wavelength conversion member 2 is then received by the light receiving section 5, and the chromaticity of the wavelength conversion member 2 is measured by the processing unit 6 based on the received light L.

[0062] In this way, when measuring the chromaticity of the wavelength conversion member 2, the bending and wrinkles of the adhesive sheet 7 are corrected, and the adhesive sheet 7 is pressed against the tip 12a of the optical fiber 12, thus stabilizing the contact state between the adhesive sheet 7 and the tip 12a of the optical fiber 12. As a result, the distance between the tip 12a of the optical fiber 12 and the wavelength conversion member 2 attached to the adhesive sheet 7 becomes less prone to fluctuation. Therefore, the chromaticity of the wavelength conversion member 2 can be measured with high accuracy.

[0063] In this embodiment, the following configuration is further provided in order to measure the chromaticity of the wavelength conversion member 2 with greater accuracy.

[0064] In other words, the area of ​​the optical emission portion 12aa of the optical fiber 12 is 0.19 mm². ２The settings are as described above. As a result, when the adhesive sheet 7 and the tip 12a of the optical fiber 12 are in contact, the range of light L irradiated onto the wavelength conversion member 2 becomes sufficiently wide compared to the size of the phosphor. Consequently, even if there is a local concentration difference of the phosphor in the wavelength conversion member 2, the system is less affected by this concentration difference, and the chromaticity of the wavelength conversion member 2 can be measured with greater accuracy.

[0065] Furthermore, with the adhesive sheet 7 and the tip 12a of the optical fiber 12 in contact, the entire light-emitting portion 12aa of the optical fiber 12 is covered by the wavelength conversion member 2 via the adhesive sheet 7. As a result, the light L emitted from the light-emitting portion 12aa is less likely to be received by the light-receiving portion 5 without passing through the wavelength conversion member 2. Consequently, unwanted light is less likely to be received by the light-receiving portion 5, allowing for more accurate measurement of the chromaticity of the wavelength conversion member 2.

[0066] Furthermore, the portion of the tip 12a of the optical fiber 12, excluding the light-emitting portion 12aa, has an overhang portion 12ab that protrudes to the outside of the wavelength conversion member 2. Therefore, it is possible to suppress the leakage of light L emitted from the light-emitting portion 12aa to the outside from unintended parts of the wavelength conversion member 2. In addition, when the tip 12a of the optical fiber 12 pushes up the adhesive sheet 7, at least the area of ​​the adhesive sheet 7 including the wavelength conversion member 2 to be measured is lifted, so it is possible to suppress the peeling of the wavelength conversion member 2 to be measured from the adhesive sheet 7. In other words, it is possible to suppress the leakage of light L emitted from the light-emitting portion 12aa to the outside from the peeled portion of the wavelength conversion member 2 to be measured. Consequently, it becomes less likely for unwanted light to be received by the light-receiving unit 5, so the chromaticity of the wavelength conversion member 2 can be measured with greater accuracy.

[0067] (Second Embodiment) As shown in Figure 6, the chromaticity measuring device according to the second embodiment of the present invention, similar to the device described in the first embodiment, has a protruding portion 12ab that extends outwards from the wavelength conversion member 2, with the tip portion 12a of the optical fiber 12 in contact with the adhesive sheet 7, excluding the light-emitting portion 12aa of the tip portion 12a of the optical fiber 12.

[0068] The chromaticity measuring device according to this embodiment differs from the device described in the first embodiment in that the cladding 14, ferrule 15, and cover 16 do not protrude outside the wavelength conversion member 2, and an extension member 18 is separately attached to extend the portion of the tip 12a of the optical fiber 12 excluding the light-emitting portion 12aa outward in order to form the protruding portion 12ab.

[0069] (Third Embodiment) The manufacturing method of the wavelength conversion member according to the third embodiment differs from the method described in the first embodiment in that the adhesive sheet to which the base material is attached in the cutting step S2 is elastic, and the adhesive sheet is also used as a holder for multiple wavelength conversion members 2 in the chromaticity measurement step S3. In this way, there is no need to replace the wavelength conversion members 2 in the cutting step S2 and the chromaticity measurement step S3, and the manufacturing efficiency of the wavelength conversion members 2 is improved.

[0070] In detail, as shown in Figure 7, in the cutting process S2, first, a plate-shaped base material 32 is attached to an elastic adhesive sheet 31. In this state, as shown in Figure 8, scribe lines 33 are formed in a grid pattern on the base material 32 using a diamond cutter or the like. Then, as shown in Figure 9, bending stress is applied to the scribe lines 33, and the base material 32 is cut (fractured) along the scribe lines 33. As a result, multiple wavelength conversion members 2 are obtained from the base material 32. In this state, no gaps are formed between the multiple wavelength conversion members 2, or if gaps are formed, they are extremely small.

[0071] As shown in Figure 10, in the chromaticity measurement step S3, the adhesive sheet 31 to which the multiple wavelength conversion members 2 are attached is stretched to form gaps (spacing Cx) between the multiple wavelength conversion members 2 on the adhesive sheet 31. At this time, if the perimeter of the stretched adhesive sheet 31 is held with a holding frame 8 (see Figure 2) or the like, the state in which gaps are formed between the multiple wavelength conversion members 2 can be easily maintained. Then, in this state, the chromaticity of each wavelength conversion member 2 can be measured by following the same procedure as the method described in the first embodiment.

[0072] The spacing Cx between adjacent wavelength conversion members 2 is preferably 0.1 mm ± 0.09 mm, more preferably 0.1 mm ± 0.07 mm, and even more preferably 0.1 mm ± 0.05 mm. With such spacing Cx, the adhesive sheet 31 can be easily formed by stretching it, and the chromaticity of each wavelength conversion member 2 can be measured without being affected by adjacent wavelength conversion members 2.

[0073] Furthermore, the present invention is not limited to the configuration of the above embodiments, nor is it limited to the effects described above. The present invention can be modified in various ways without departing from the spirit of the invention.

[0074] In the above embodiment, when measuring the chromaticity of the wavelength conversion member 2, the portion of the adhesive sheet 7 that contacts the tip 12a of the optical fiber 12 is positioned higher than the portion of the adhesive sheet 7 that does not contact the tip 12a of the optical fiber 12. However, the configuration is not limited to this. For example, if the bending and wrinkles of the adhesive sheet 7 are corrected and the tip 12a of the optical fiber 12 and the adhesive sheet 7 are in reliable contact, the portion of the adhesive sheet 7 that contacts the tip 12a of the optical fiber 12 may be positioned at the same height or lower than the portion of the adhesive sheet 7 that does not contact the tip 12a of the optical fiber 12.

[0075] In the above embodiment, the case in which the tip 12a of the optical fiber 12 is in contact with the adhesive sheet 7 was described. However, for example, the optical fiber 12 may be omitted in the light-emitting unit 4, and the light source 11 may be in contact with the adhesive sheet 7.

[0076] In the above embodiment, the case in which the tip of the light-emitting unit 4 (the tip 12a of the optical fiber 12) is in contact with the adhesive sheet 7 was described, but the configuration is not limited to this. For example, the light-emitting unit 4 may be placed on the wavelength conversion member 2 side of the laminate 10, and the light-receiving unit 5 may be placed on the adhesive sheet 7 side of the laminate 10, with the tip of the light-emitting unit 4 in contact with the wavelength conversion member 2 to be measured.

[0077] In the above embodiment, the case in which the laminate 10 is arranged so that the adhesive sheet 7 side faces downward and the wavelength conversion member 2 side faces upward was described. However, the laminate 10 may also be arranged so that the adhesive sheet 7 side faces upward and the wavelength conversion member 2 side faces downward.

[0078] In the above embodiment, the case in which the holder for holding the wavelength conversion member 2 is an adhesive sheet 7 was described, but the material of the holder is not particularly limited. The holder may be, for example, a resin plate that can transmit light L emitted from the light-emitting unit 4.

[0079] In the above embodiment, the case in which the light-emitting unit 4 is moved vertically by the vertical movement mechanism 17 and the wavelength conversion member 2 is moved horizontally by the horizontal movement mechanism 9 was described, but the configuration is not limited to this. In the vertical direction, the wavelength conversion member 2 can be moved relative to the light-emitting unit 4 so that the light-emitting unit 4 is in direct or indirect contact with the wavelength conversion member 2. For example, the wavelength conversion member 2 may be moved vertically while the light-emitting unit 4 is stationary. Similarly, in the horizontal direction, the wavelength conversion member 2 can be moved relative to the light-emitting unit 4 and the light-receiving unit 5 so that the wavelength conversion member 2 to be measured is located within the measurement area between the light-emitting unit 4 and the light-receiving unit 5. For example, the light-emitting unit 4 and the light-receiving unit 5 may be moved horizontally while the wavelength conversion member 2 is stationary.

[0080] 1 Chromaticity measuring device 2 Wavelength conversion member 3 Support part 4 Light emitting part 5 Light receiving part 6 Processing part 7 Adhesive sheet (holding body) 8 Holding frame 9 Horizontal movement mechanism 10 Laminate 11 Light source 12 Optical fiber 12a Tip part 12aa Light emitting part 12ab Protruding part 13 Core 17 Vertical movement mechanism 18 Extension member L Light S1 Raw material manufacturing process S2 Cutting process S3 Chromaticity measuring process

Claims

1. A method for measuring the chromaticity of a wavelength conversion member, wherein a light-emitting unit is placed on the first main surface side of a laminate formed by laminating and attaching a holder to a wavelength conversion member containing a phosphor, and a light-receiving unit is placed on the second main surface side of the laminate opposite to the first main surface, and the chromaticity of the wavelength conversion member is measured based on the light received by the light-receiving unit from the light-emitting unit. The method is characterized in that the tip of the light-emitting unit is brought into contact with the first main surface of the laminate at a position corresponding to the wavelength conversion member.

2. The method for measuring the chromaticity of a wavelength conversion member according to claim 1, wherein the holder is arranged on the first main surface side of the laminate, the wavelength conversion member is arranged on the second main surface side of the laminate, and the tip of the light-emitting part is in contact with the holder.

3. The method for measuring the chromaticity of a wavelength conversion member according to claim 2, wherein the laminate is arranged such that the first main surface side faces downward and the second main surface side faces upward.

4. The method for measuring the chromaticity of a wavelength conversion member according to claim 3, wherein the portion of the first main surface of the laminate that is in contact with the tip of the light-emitting portion is pushed up by the tip of the light-emitting portion such that it is located at a higher position than the portion that is not in contact with the tip of the light-emitting portion.

5. The area of ​​the light-emitting part that emits the light at the tip of the light-emitting part is 0.19 mm². ２ The method for measuring the chromaticity of a wavelength conversion member according to any one of claims 1 to 4.

6. A method for measuring the chromaticity of a wavelength conversion member according to any one of claims 1 to 4, wherein the tip of the light-emitting part is in contact with the first main surface of the laminate, and the entire light-emitting part that emits light at the tip of the light-emitting part is covered by the wavelength conversion member.

7. The method for measuring the chromaticity of a wavelength conversion member according to claim 6, wherein, with the tip of the light-emitting unit in contact with the first main surface of the laminate, the portion of the tip of the light-emitting unit excluding the light-emitting portion has an overhang that protrudes to the outside of the wavelength conversion member.

8. The method for measuring the chromaticity of a wavelength conversion member according to any one of claims 1 to 4, wherein the light-emitting unit comprises a light source that generates the light and an optical fiber that guides the light from the light source, and the tip of the optical fiber is in contact with the first main surface of the laminate.

9. The method for measuring the chromaticity of a wavelength conversion member according to any one of claims 1 to 4, wherein the holder is an adhesive sheet.

10. A chromaticity measuring device for a wavelength conversion member, comprising: a light-emitting unit disposed on the first main surface side of a laminate formed by laminating and attaching a holder to a wavelength conversion member containing a phosphor, and a light-receiving unit disposed on the second main surface side opposite the first main surface of the laminate, and a light-receiving unit disposed on the second main surface side opposite the first main surface of the laminate, wherein the device irradiates the laminate with light from the light-emitting unit and measures the chromaticity of the wavelength conversion member based on the light received by the light-receiving unit from the laminate, characterized in that the device comprises a moving mechanism that moves the tip of the light-emitting unit relative to the laminate, and brings the tip of the light-emitting unit into contact with the first main surface of the laminate at a position corresponding to the wavelength conversion member.

11. A method for manufacturing a wavelength conversion member containing a phosphor, characterized by comprising the step of measuring the chromaticity of the wavelength conversion member by the chromaticity measurement method described in any one of claims 1 to 4.

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