LED Lenses

Abstract

To provide lenses for LEDs that can suppress the decrease in transmittance, prevent misalignment during transport and release, and improve manufacturing yields.SOLUTION: A lens 10 for LEDs has a body part 11 made of silica glass. The body part 11 has a lens part 12 and a flange part 13. The body part 11 has a recess-forming area with a plurality of irregular recesses on at least a portion of the surface where light from the LED is emitted, the width of the recess is between 3 μm and 20 μm, its depth is between 0.1 μm and 1 μm, and its density is between 50 pieces / mm2 and 1000 pieces / mm2, and the arithmetic mean roughness Ra (JIS B 0601-1994) of the surface where the light emitted from a light emitting element is emitted, other than concave portions, is between 0.02 μm and 0.08 μm.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a lens for an LED (Light Emitting Diode). [Background technology]

[0002] Mercury lamps have traditionally been widely used for UV sterilization, but with the coming into force of the Minamata Convention on Mercury, the manufacture and import / export of mercury products has been restricted since 2020. For this reason, UV LEDs, especially deep UV LEDs with wavelengths of 280 nm or less, are attracting attention as an alternative light source after the lifespan of currently used mercury lamps has expired. LEDs are used, for example, supported by a base member and sealed with a transparent sealing member.

[0003] For example, in Patent Document 1, a transparent sealing member is provided with micro recesses at least on the surface from which light from a light emitting element is emitted, and the average width of each micro recess is 0.1 μm to 2.0 μm, the average depth of each micro recess is 5 nm to 50 nm, and the average frequency of the micro recesses is 1 mm 2 It is stated that the number of prizes must be between 100,000 and 3 million.

[0004] Furthermore, for example, Patent Document 2 describes a device for transporting a transparent sealing member, which uses a suction pad to suck and transport a transparent sealing member by vacuum suction. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent Publication No. 2019-12743 [Patent Document 2] Japanese Patent Application Publication No. 6-320465 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the transparent sealing member described in Patent Document 1, extremely minute recesses having an average width of 0.1 μm to 2.0 μm and an average depth of 5 nm to 50 nm are formed within an area of ​​1 mm. 2 Because there are so many of these LEDs - between 100,000 and 3 million per LED - there was a risk that the light from the LED elements would be scattered, reducing transmittance and therefore the amount of light.

[0007] In addition, in the past, there was a problem that while the transparent sealing member was being transported by vacuum suction, the surface slippage caused the member to shift to the transport position, causing problems. Furthermore, when the transparent sealing member was to be detached after transportation, the transparent sealing member would not come off easily and would jump up, causing the member to shift to the transport position, causing problems. Therefore, there was a risk of a decrease in the manufacturing yield during the sorting process of the transparent sealing member and during the bonding of the transparent sealing member to the base member on which the LED elements are arranged.

[0008] The present invention has been made in light of the above problems, and aims to provide an LED lens that can suppress the decrease in transmittance, prevent misalignment during transportation and removal, and improve manufacturing yield. [Means for solving the problem]

[0009] The LED lens of the present invention covers a light-emitting element and has a main body made of a transparent material, and the main body has a recess formation region in which a plurality of recesses are irregularly arranged on at least a part of a surface from which light from the light-emitting element is emitted, the recesses having a width of 3 μm or more and a depth of 0.1 μm or more and 1 μm or less and a density of 50 recesses / mm2 or more and 1000 recesses / mm2 or less, and the arithmetic mean roughness Ra (JIS B 0601-1994) of the portion of the surface from which light from the light-emitting element is emitted other than the recesses is 0.02 μm or more and 0.08 μm or less. Effect of the Invention

[0010] According to the LED lens of the present invention, it is possible to more effectively prevent the misalignment during transportation and removal, and also to suppress the decrease in transmittance by suppressing scattering of light from the light-emitting element. [Brief description of the drawings]

[0011] [Figure 1] 1 is a diagram illustrating a configuration of an LED lens according to a first embodiment of the present invention. [Diagram 2] 2 is a cross-sectional view illustrating a configuration of an LED device using the LED lens illustrated in FIG. 1. [Diagram 3] 2 is a diagram illustrating a schematic configuration of a recess formed on the surface of the LED lens illustrated in FIG. 1. [Figure 4] 4 is a photograph showing a recess on the top surface of the lens portion in Example 1. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0013] (First embodiment) Fig. 1 shows the configuration of an LED lens 10 according to a first embodiment, where (A) shows a cross-sectional configuration and (B) shows a configuration seen from above. Fig. 2 shows a cross-sectional structure of an LED device 20 using the LED lens 10. Fig. 3 shows a schematic configuration of a recess 11A formed on the surface of the LED lens 1.

[0014] The LED lens 10 is a transparent sealing member that seals a light-emitting element such as an LED 21, and is used in an LED device 20. The LED device 20 includes, for example, the LED lens 10, an LED 21, and a base member 22 that supports the LED 21, and the LED lens 10 is disposed on the base member 22 so as to cover the LED 21. The base member 22 is made of ceramic such as aluminum nitride. The base member 22 is provided with, for example, a concave mounting portion 23 for mounting the LED 21, and a step portion 24 for mounting the LED lens 10 is provided on the upper portion of the mounting portion 23. The base member 22 and the LED lens 10 are welded and joined by a solder layer 25 made of, for example, AuSn solder. It is preferable that a metallized layer 26 made of metal is formed on the upper surface of the step portion 24 to improve wettability with the solder.

[0015] The LED lens 10 includes a main body 11 made of a transparent material. The main body 11 includes a semi-spherical lens 12 made of, for example, silica glass, and a flange 13 provided on the flat side periphery of the lens 12. The main body 11 includes a recessed portion forming region in which a plurality of recesses 11A are irregularly provided on at least a part of the surface from which light from the LED 21 is emitted, that is, at least a part of the outer surface of the lens 12. The outer surface of the lens 12 is also a surface to be attracted when the LED lens 10 is transported by vacuum suction. The recessed portion forming region is preferably provided on the entire outer surface of the lens 12. Note that the recessed portion forming region and the recesses 11A are omitted in FIG. 1 and FIG. 2.

[0016] By providing the predetermined recess 11A on at least a part of the surface from which the light from the LED 21 is emitted, the scattering of the light from the light emitting element is suppressed, thereby suppressing the decrease in transmittance, while the frictional force with the suction pad can be increased when the LED lens 10 is transported by vacuum suction, and the suction pad can be deformed and bite into the recess 11A without any gaps, thereby increasing the sealing performance, thereby improving the suction force and suppressing misalignment during transport. In addition, leakage between the LED lens 10 and the suction pad becomes easier after suction transport, and detachment becomes easier, thereby suppressing misalignment.

[0017] Furthermore, when the recesses 11A are provided in a regular pattern, even a slight misalignment of the suction pad can cause a large change in the number of recesses 11A that the suction pad comes into contact with, which makes the suction force for transporting the LED lens 10 prone to change. However, when the recesses 11A are provided in an irregular pattern, the number of recesses 11A that the suction pad comes into contact with is averaged, which makes it possible to reduce the change in the suction force for transporting the LED lens 10 even if the suction pad is misaligned, and stabilizes the suction conditions of the transport device.

[0018] The width W of the recess 11A is preferably in the range of 3 μm to 20 μm. That is, the minimum value of the width W of the recess 11A is preferably 3 μm and the maximum value is preferably 20 μm. If the width W is less than 3 μm, the suction pad cannot deform into the recess without gaps, resulting in voids, which causes air leakage and reduces the suction force. If the width W exceeds 20 μm, when the LED lens 10 is suctioned by the suction pad, the number of places where one recess 11A cannot be entirely blocked increases, which causes air leakage and reduces the suction force. The "width W" of the recess 11A means the longest length of the outer peripheral shape of the surface when the recess 11A is viewed vertically from above. For example, if the outer peripheral shape of the surface is circular, it is the diameter, and if it is rectangular, it is the longer length of the diagonal line.

[0019] The depth H of the recess 11A is preferably in the range of 0.1 μm to 1 μm. That is, the minimum value of the depth H of the recess 11A is preferably 0.1 μm and the maximum value is preferably 1 μm. If the depth H is less than 0.1 μm, the amount of deformation of the suction pad is small, making it difficult to sufficiently improve the suction force, while if the depth H exceeds 1 μm, the suction pad cannot deform into the recess 11A without leaving any gaps, and the holding force due to air leakage decreases. In other words, within this range, the suction pad deforms into the recess 11A without any gaps, improving the sealing property and improving the suction force. Also, if the depth H exceeds 1 μm, the light from the LED 21 is easily scattered and the transmittance decreases.

[0020] The density of the recesses 11A is 50 pieces / mm 2 More than 1000 pieces / mm 2 It is preferable that the density of the particles is 50 particles / mm or less. 2 If the density is less than 1000 pieces / mm, the suction force is not improved, and the lens 10 is likely to be displaced from the transport position during transport. Also, when the lens 10 for LEDs is to be detached after transport, the lens 10 for LEDs is not easily removed, and the lens 10 is likely to be displaced from the transport position. 2 If the recesses 11A are too large, the light from the LEDs 21 will be scattered more due to the increase in the recesses 11A, the transmittance will decrease, and air leakage will increase during suction and transport, making the suction force unstable.

[0021] The density of the recesses 11A was measured in five arbitrary measurement areas of 1 mm×1 mm in the recess formation area, and all of the five measurement areas had a density of 50 recesses / mm 2 More than 1000 pieces / mm 2 The above-mentioned effects can be obtained within the following range. Specifically, the density of the recesses 11A is measured in five arbitrary measurement areas of 1 mm×1 mm in the recess formation area, and the density is 50 / mm 2 More than 1000 pieces / mm 2 Within the range below, the density of the recesses 11A in the recess formation region is 50 pieces / mm 2 More than 1000 pieces / mm 2 It is determined that the following is true:

[0022] The outer peripheral shape of the surface of the recess 11A is preferably a shape that does not have any corners consisting of a curved line or a combination of a curved line and a straight line when the recess 11A is viewed vertically from above, and the inner shape of the recess 11A is preferably a shape that does not have any corners consisting of a curved surface or a combination of a curved surface and a flat surface in any vertical cross section of the recess 11A. This makes it possible to more effectively prevent the light from the LED 21 from being scattered due to the presence of corners and the transmittance from decreasing. In addition, the presence of corners makes it possible to more effectively prevent the suction pad from being unable to deform in the recess 11A without any gaps, creating gaps, which makes it easier for the position to shift during transportation due to air leakage, and makes it easier for chipping and cracking to occur in the LED lens 10 when the suction pad comes into contact with the recess 11A. Furthermore, it is possible to more effectively prevent the suction pad from being caught in the corners and wearing away, which makes it easier for debris from the suction pad to adhere to the surface of the LED lens 10, which causes problems in visual inspection, etc.

[0023] It is preferable that the upper outer edge of the recess 11A is rounded all around and has a curved shape that does not have any acute angles, because this can improve the adhesion of the suction pad and reduce wear.

[0024] The arithmetic mean roughness Ra (JIS B 0601-1994) of the portion of the outer surface of the lens portion 12 other than the recessed portion 11A is preferably 0.02 μm or more and 0.08 μm or less. When the arithmetic mean roughness Ra is 0.02 μm or more, no separate high-precision polishing is required, and high productivity is obtained. On the other hand, when the arithmetic mean roughness Ra is 0.08 μm or less, light scattering is suppressed and a higher transmittance is obtained.

[0025] In addition, it is preferable that an anti-reflection film (not shown) is formed at least on the outer surface of the lens portion 12. This is because the anti-reflection film reduces minute steps, such as those caused by a processing tool, that occur when the curved surface of the recess 11A is formed, and the adhesion of the suction pad can be improved. In addition, the corners of the upper outer edge of the recess 11A are smoothed, which reduces wear of the suction pad and reduces chipping and cracking of the LED lens 10. The anti-reflection film may be formed of a single layer film made of a low refractive index material such as MgF2, or may be formed of a multilayer film made of a combination of a low refractive index material such as MgF2, Al2O3, or SiO2 and a high refractive index material such as Nb2O3, TiO2, ZrO2, or Ta2O5.

[0026] The flange portion 13 is for, for example, disposing the lens portion 12 on the base member 22, and is disposed with the bottom surface of the flange portion 13 abutting against the step portion 24. A metallized layer 14 made of metal is preferably formed on the bottom surface of the flange portion 13, i.e., the surface that abuts against the step portion 24, for example, in order to improve wettability with solder. The metallized layer 14 is formed, for example, in a frame shape, and preferably has, in order from the main body portion 11 side, a base layer, an intermediate layer, and a surface layer. The base layer preferably includes at least one layer of a Cr layer and a Ti layer, the intermediate layer preferably includes at least one layer of a Ni layer and a Ti layer, and the surface layer is preferably made of Au.

[0027] The LED lens 10 can be manufactured, for example, as follows. First, a metal mold for the main body 11 is formed, and a plurality of recesses corresponding to the recesses 11A are irregularly formed on the surface of the part of the metal mold corresponding to the lens portion 12 by machining. The shape and density of the recesses corresponding to the recesses 11A are as described above. Next, resin is poured into the prepared metal mold to transfer the shape of the metal mold, and a slurry containing silica powder is poured into the transferred resin mold to form the main body 11 by a gel casting method. Next, for example, the bottom surface of the main body 11 is polished, the thickness of the flange portion 13 is adjusted, and a metallized layer 14 is formed on the bottom surface of the flange portion 13 by, for example, a vacuum deposition method or a sputtering method. Thereafter, an anti-reflection film is formed on the surface of the lens portion 12 as necessary.

[0028] Thus, according to this embodiment, at least a part of the surface from which the light from the LED 21 is emitted has a recessed portion forming region in which a plurality of recesses 11A of a predetermined size are provided, so that the scattering of the light from the light emitting element is suppressed, thereby suppressing the decrease in transmittance, and at the same time, when the LED lens 10 is transported by vacuum suction, the frictional force with the suction pad can be increased, and the sealing property can be improved, so that the positional deviation during transport can be suppressed. In addition, since the leak between the transparent sealing member and the suction pad becomes easy after the suction transport, and the separation becomes easy, the positional deviation during separation can be suppressed. Therefore, the manufacturing yield can be improved.

[0029] Furthermore, since the recesses are arranged irregularly, the number of recesses with which the suction pads come into contact is averaged, and even if the position of the suction pads is shifted, the change in the suction force for transporting the transparent sealing member can be reduced, and the suction conditions of the transport device can be stabilized.

[0030] In addition, since the density of the recesses is set within a predetermined range, it is possible to more effectively prevent positional shifts during transportation and removal, and it is possible to suppress scattering of light from the light-emitting element and reduce a decrease in transmittance.

[0031] Furthermore, if the outer peripheral surface shape of the recess is a shape that has no corners and is formed of a curve or a combination of a curve and a straight line, and the inner surface shape of the recess is a shape that has no corners and is formed of a curved surface or a combination of a curve and a flat surface, scattering of light from the light emitting element can be further suppressed and the suction force of the suction pad can be further improved. Also, chipping or cracking can be suppressed when the suction pad comes into contact with the recess, and debris from the suction pad can be suppressed from being caught and worn away, resulting in adhesion of suction pad debris to the surface of the transparent sealing member. EXAMPLES

[0032] Example 1 An LED lens 10 as shown in Fig. 1 was fabricated. First, a metal mold for the main body 11 was formed from nickel, and 100 depressions / mm2 corresponding to the recesses 11A with a width W of 3 µm to 16 µm and a depth H of 0.3 µm to 0.8 µm were formed on the entire outer surface of the part of the metal mold corresponding to the lens portion 12. 2 ~200 pieces / mm 2 The density of the metal mold was irregularly formed by machining. Silicone rubber was poured into the prepared metal mold, and the shape of the metal mold was transferred. A slurry containing silica powder was poured into the transferred silicone rubber mold, and the main body 11 was molded by a gel casting method. The molded main body 11 was fired to prepare a main body 11 made of silica glass having a flange portion 13 with a flange diameter of 3.5 mm x 3.5 mm and a flange thickness of 1.0 mm, and a lens portion 12 with a lens diameter of φ3 mm and a lens height of 1.5 mm. The bottom surface of the obtained main body 110 was polished to adjust the flange thickness to 0.5 mm.

[0033] The obtained main body portion 11 was irradiated with UV laser light (wavelength: 408 nm) using a laser microscope (VK-9700) made by Keyence Corporation, and the recesses 11A on the outer surface of the lens portion 12 were photographed, and the density, width W, and depth H of the recesses 11A were measured. The photograph of the top surface of the lens portion 12 is shown in FIG.

[0034] The method for measuring the density, width W, and depth H of the recesses 11A is as follows. First, the LED lens 10 was placed on an inclined jig, and the recess 11A on the top surface of the lens portion 12 was observed. Specifically, the number of recesses 11A with widths W of 3 μm to 20 μm in a measurement area of ​​1 mm × 1 mm on the top of lens portion 12 was counted using an objective lens × 10, and further, the depth H of recesses 11A with widths W of 3 μm to 20 μm was measured using an objective lens × 50. The number of recesses 11A in the measurement area on the top of lens portion 12 was 124. Next, the LED lens 10 was tilted, and the recesses 11A were observed in the same manner at the other four measurement areas of 1 mm×1 mm in sequence. The number of recesses 11A at each location was 156 at the second location, 82 at the third location, 62 at the fourth location, and 183 at the fifth location. The average number at the five locations was 121. When the width W of each recess 11A was measured, it was within the range of 3 μm to 20 μm for all of them. When the depth H of each recess 11A was measured, it was within the range of 0.1 μm to 1 μm for all of them. Observation with a microscope confirmed that the upper outer edge of each recess 11A was curved without any acute angles around the entire circumference, and that the outer peripheral surface shape of each recess 11A was a shape without any corners consisting of a curved line or a combination of a curved line and a straight line, and that the inner surface shape of each recess 11A was a shape without any corners consisting of a curved surface or a combination of a curved surface and a flat surface.

[0035] Next, the calculated average roughness Ra of the portion of the outer surface of the lens portion 12 other than the recessed portion 11A was measured using a Form Talysurf (PGI830) from Ametex Corporation. The cutoff was 0.25 mm, the reference length was 0.25 mm, the evaluation length was 1.25 mm, and the filtering was performed using a Gaussian filter. As a result, the arithmetic average roughness Ra was 0.033 μm.

[0036] Next, a sputtering device was used to deposit a 50 nm thick Cr layer, a 150 nm thick Ni layer, and a 300 nm thick Au layer in this order on the bottom surface of the flange portion 13. A photosensitive resist was applied to the deposited main body portion 11, and a frame-shaped metallized layer 14 with an outer diameter of 3.3 mm × 3.3 mm and an inner diameter of 2.7 mm × 2.7 mm was formed by photolithography.

[0037] A transport test was conducted on the manufactured LED lenses 10, in which they were sorted in order at equal intervals onto a 6-inch wafer ring with UV tape attached. For sorting, 1000 pieces were transported with a rubber suction pad adsorbed onto the outer surface of the lens portion 12. No misalignment was observed among the sorted 1000 LED lenses 10.

[0038] In addition, the sorted LED lens 10 was irradiated with UV light to reduce the adhesive strength of the UV tape, and then a frame-shaped solder layer 25 made of AuSn solder with an outer diameter of 3.2 mm x 3.2 mm, an inner diameter of 2.8 mm x 2.8 mm, and a thickness of 20 μm was inserted between the flange portion 13 and the step portion 24 of the basic member 22 to bond them to the basic member 22 made of aluminum nitride, and the LED device 20 was obtained by pressing them under conditions of a temperature of 300°C, a pressure of 0.5 MPa, and a time of 30 seconds. At that time, a rubber suction pad was attached to the outer surface of the lens portion 12 and transported onto the basic member 22 of the bonding device. When 100 LED devices 20 were produced, no manufacturing defects due to misalignment of the bonding position occurred.

[0039] Furthermore, in order to evaluate the transmittance of the LED lens 10 thus produced, a flat plate having a concave portion formed on one side thereof equivalent to that of the above-mentioned Example 1 was produced in the same manner as that of Example 1 except for the shape, and the back side of the surface on which the concave portion was formed was polished to produce a flat plate of 30 mm x 30 mm x 2.0 mm (corresponding to a lens height of 1.5 mm + a flange thickness of 0.5 mm). The arithmetic mean roughness Ra of the portion other than the concave portion on the surface on which the concave portion was formed was measured using a Form Talysurf (PGI830) from Ametex Corporation. The arithmetic mean roughness Ra was 0.045 μm, which was equivalent to the outer surface of the lens portion 12 of the above-mentioned LED lens 10. In addition, the average density of the concave portions measured at five points in the same manner was 132, the width W of each concave portion was within the range of 3 μm to 20 μm, and the depth H of each concave portion was within the range of 0.1 μm to 1 μm, which was equivalent to that of the above-mentioned LED lens 10. The transmittance of the obtained plate was measured using a spectrophotometer (UH4150) manufactured by Hitachi, Ltd. As a result, the transmittance at a wavelength of 300 nm was 92.8%.

[0040] Comparative Example 1 A silica glass block was cut and polished to produce a silica glass body having a lens portion and a flange portion, with no recess in the lens portion. The produced body was the same as in Example 1, except that it had no recess. The calculated average roughness Ra of the outer surface of the lens portion of the obtained main body was measured in the same manner as in Example 1. The arithmetic average roughness Ra was 0.003 μm. Next, a metallized layer was formed on the bottom surface of the flange portion in the same manner as in Example 1, to produce an LED lens without a recess.

[0041] A transport test was also carried out on 1000 LED lenses of Comparative Example 1 in the same manner as in Example 1. As a result, the LED lenses slipped off the suction pad during sorting and became slanted, and when they were attached to the UV tape, they were displaced from the designated attachment position. It was confirmed that 170 out of 1000 lenses were displaced.

[0042] In addition, 100 LED devices were produced using the LED lens of Comparative Example 1 in the same manner as in Example 1. In Comparative Example 1, when the outer surface of the lens part was sucked and transported onto the base member, the LED lens slipped off the suction pad and became slanted, resulting in misalignment during bonding. In Comparative Example 1, 23 out of 100 units had manufacturing defects due to misalignment of the bonding position.

[0043] In order to evaluate the transmittance of the LED lens of Comparative Example 1, a flat plate with no recesses measuring 30 mm x 30 mm x 2.0 mm was prepared in the same manner as in Comparative Example 1, and the transmittance was measured in the same manner as in Example 1. As a result of the measurement, the transmittance at a wavelength of 300 nm was 93.0%, which was not significantly different from Example 1.

[0044] Comparative Example 2 A silicone rubber mold was produced without forming any recesses on the surface of the nickel metal mold for the main body described in Example 1, and the particle size of the silica powder used as the raw material was adjusted. The gel casting method was used to form recesses with a width of 0.1 μm to 2.0 μm and a depth of 5 nm to 50 nm on the outer surface of the lens part at a rate of approximately 250,000 pieces / mm 2 A silica glass body having a density of 0.020 μm and an arithmetic mean roughness Ra of the outer surface of the lens portion was prepared. The prepared body was the same as that of Example 1, except that the configuration of the recesses was different. In order to evaluate the transmittance of the prepared body of Comparative Example 2, a flat plate having recesses equivalent to those of Comparative Example 2 formed on one side was prepared in the same manner as Comparative Example 2 except for the shape, as in Example 1, and the transmittance at a wavelength of 300 nm was measured with a spectrophotometer. As a result, the transmittance was 88%, which was lower than that of Example 1 and Comparative Example 1. It is considered that the number of recesses affects the transmittance.

[0045] Comparative Example 3 The surface of the metal mold of the main body is provided with 50 recesses per mm, each 1 μm wide and 0.05 μm deep. 2 The outer surface of the lens part was then formed with 50 recesses per mm, each with a width of 1 μm and a depth of 0.05 μm. 2Except for the formation of the lens, an LED lens was produced in the same manner as in Example 1. For the LED lens of Comparative Example 3, a transport test was carried out on 1000 pieces in the same manner as in Example 1. As a result, the LED lens slipped off the suction pad during sorting and became slanted, and when it was attached to the UV tape, a positional deviation occurred from the designated attachment position. It was confirmed that there was a deviation in 100 out of 1000 pieces.

[0046] In addition, 100 LED devices were produced using the LED lens of Comparative Example 3 in the same manner as in Example 1. In Comparative Example 3, when the outer surface of the lens part was sucked and transported onto the base member, the LED lens slipped off the suction pad and became slanted, resulting in misalignment during bonding. In Comparative Example 3, manufacturing defects occurred in 16 of the 100 units due to misalignment of the bonding position.

[0047] Comparative Example 4 The surface of the metal mold of the main body is provided with 2000 recesses per mm, each with a width of 5 μm to 30 μm and a depth of 0.3 μm to 1 μm. 2 The outer surface of the lens part is then provided with 2000 recesses per mm, each with a width of 5 μm to 30 μm and a depth of 0.3 μm to 1 μm. 2 Except for the formation of the lens, an LED lens was produced in the same manner as in Example 1. For the LED lenses of Comparative Example 4, a transport test was carried out on 1000 lenses in the same manner as in Example 1. As a result, the LED lenses came off the suction pads and fell during sorting, and 720 of the 1000 lenses could not be transported.

[0048] Also, for the LED lens of Comparative Example 4, 100 LED devices were produced in the same manner as in Example 1. In Comparative Example 4, when the outer surface of the lens portion was sucked and transported onto the base member, the LED lens came off the suction pad and fell, and 69 out of the 100 could not be bonded.

[0049] Although the present invention has been described above with reference to the embodiment, the present invention is not limited to the above embodiment and can be modified in various ways.

[0050] For example, in the above embodiment, the configuration of the LED lens 10 has been specifically described, but other configurations may be used. For example, in the above embodiment and examples, the outer peripheral shape of the flange parts 13, 33 has been described as being square, but it may be circular or a polygon other than a square. Also, the flange parts 13, 33 may not be provided. In that case, for example, the peripheral part of the flat part of the lens part 12 or the open end of the cap part 32 can be disposed in contact with the base member 22. Furthermore, in the above embodiment, the lens part 12 has been described as being hemispherical, but it may be in a shape other than hemispherical (spherical), such as an aspherical surface or a semi-elliptical surface.

[0051] In addition, although the above embodiment specifically describes the configuration of the base member 22, the base member 22 may have other configurations. For example, the above embodiment describes a case where the recessed mounting portion 23 for mounting the LEDs 21 is provided on one surface of the flat plate, but the LEDs 21 may be mounted on a flat plate on which the mounting portion 23 is not formed, or may be in the form of a housing. [Industrial Applicability]

[0052] The present invention can be used in lenses for LEDs. [Explanation of symbols]

[0053] Reference Signs List 10: LED lens, 11: main body, 11A: recess, 12: lens portion, 13: flange portion, 14: metallized layer, 20: LED device, 21: LED, 22: basic member, 23: mounting portion, 24: step portion, 25: solder layer, 26: metallized layer

Claims

1. An LED lens for covering a light emitting element, A main body made of a transparent material, the body portion has a recessed portion forming region in which a plurality of recessed portions are irregularly provided on at least a part of a surface through which light from the light emitting element is emitted, The width of the recesses is 3 μm to 20 μm, the depth is 0.1 μm to 1 μm, and the density of the recesses is 50 pieces / mm ２ More than 1000 pieces / mm ２ is as follows: The arithmetic mean roughness Ra (JIS B 0601-1994) of the surface from which light from the light emitting element is emitted, other than the recesses, is 0.02 μm or more and 0.08 μm or less. A lens for an LED.

2. 2. The LED lens according to claim 1, further comprising an anti-reflection film formed on a surface from which light from said light emitting element is emitted.

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