JP6655881B2 - Manufacturing method of lens with light-shielding layer - Google Patents

Description

  The present invention relates to a method for manufacturing a lens with a light-shielding layer in which a light-shielding layer is formed on an outer peripheral portion surrounding a lens surface on a radially outer side.

  In a lens, a configuration may be adopted in which a light shielding layer is formed on an outer peripheral portion surrounding a lens surface on a radially outer side to prevent unnecessary light incidence and reflection. In manufacturing such a lens with a light-shielding layer, a configuration in which a coating material head made of a felt-like material in which a liquid material for forming a light-shielding layer is infiltrated is brought into contact with the outer peripheral portion of the lens to apply the liquid material to the outer peripheral portion. It has been proposed (see Patent Document 1).

JP-A-3-296449

  However, in a configuration in which a coating material head made of a felt-shaped material is brought into contact with the outer peripheral portion of a lens to apply a liquid material, if the amount of liquid material seeping into the coating head fluctuates, the application amount of the liquid material fluctuates, and light is blocked. There are problems such as a variation in the thickness of the layer.

  In view of the above problems, an object of the present invention is to provide a method of manufacturing a lens with a light-shielding layer that can appropriately apply a liquid material for forming a light-shielding layer to an outer peripheral portion.

In order to solve the above-mentioned problem, the present invention provides a method for manufacturing a lens with a light-shielding layer in which a light-shielding layer is formed on an outer peripheral portion surrounding a concave lens surface on at least one surface side on a radially outer side at least on one side of the lens. After forming, a first step of applying a liquid material for forming a light-shielding layer over the entire circumference along the inner edge of the outer peripheral portion, and after the first step, the lens is rotated around the optical axis, and centrifugal force is applied. And a second step of causing the liquid material to flow radially outward. In the first step and the second step, the lens is supported by a lens holder with the one surface facing upward, and the second step is performed. When the lens is rotated in the process, air is blown from an air nozzle to the center of the lens surface at a position above the lens, and air is drawn upward or around the lens through a hood by a suction mechanism. Sucked towards the lens, the outer peripheral portion, a first annular surface which surrounds the lens surface in the radially outward, before the first annular surface radially outwardly of said first annular surface
A second annular surface recessed toward the other surface side of the lens; and an annular outer peripheral surface connecting the first annular surface and the second annular surface. After applying the liquid material over the entire circumference along the inner edge of the first annular surface as the inner edge, in the second step, the lens is rotated around the optical axis to radially move the liquid material by centrifugal force. A liquid material for forming a light-shielding layer along a boundary between the annular outer peripheral surface and the first annular surface which is radially outwardly separated from an inner edge of the first annular surface to which the liquid material has been applied, And a fourth step of rotating the lens around the optical axis and flowing the liquid applied in the third step radially outward by centrifugal force. It is characterized by the following.

In the present invention, in the first step, after the liquid material for forming the light shielding layer is applied along the inner edge of the outer peripheral portion where the light shielding layer of the lens is to be formed, in the second step, the viscosity of the liquid material and the thickness of the light shielding layer are increased. The lens is rotated around the optical axis at a speed corresponding to the speed and the like, and the liquid material flows radially outward by centrifugal force. Therefore, unlike the case where the liquid material is applied by the application head made of the felt-like material, the situation where the amount of the liquid material seeping into the application head fluctuates and the application amount of the light-shielding layer varies does not occur. Therefore, the liquid material for forming the light shielding layer can be appropriately applied to the outer peripheral portion, and the thickness of the light shielding layer is stabilized. In rotating the lens in the second step, air is blown onto the lens surface at a position above the lens. Accordingly, on one side of the lens, an airflow is generated from the radially inner side to the radially outer side. In the second step, the liquid material flowing along the annular inner peripheral surface of the lens is moved toward the radially outer side of the lens. Even when scattered as droplets or the like, it is possible to suppress the scattered liquid from adhering to the lens. In addition, when rotating the lens in the second step, air is sucked upward or downward around the lens, so when the lens receiving base is rotated at a high speed, the liquid material scatters from the lens as droplets or the like. Again, such liquids are removed from around the lens by an air stream. For this reason, it is possible to suppress the scattered liquid material from adhering to the lens. In the case where a downward step (annular outer peripheral surface) is present on the outer peripheral portion of the lens, the liquid material is scattered radially outside the step portion in the second step, and the annular outer peripheral surface and the second annular surface are formed. It is difficult to appropriately apply the liquid material to the surface, but if the above-described third step and fourth step are performed, the liquid material can be appropriately applied also to the annular outer peripheral surface and the second annular surface.

  In the present invention, in the first step, an aspect is adopted in which the lens is rotated one or more rotations around the optical axis while supplying the liquid material from the liquid material discharge nozzle toward the inner edge of the outer peripheral portion. Can be. According to such a configuration, the first step can be performed efficiently.

  In this case, in the first step, for example, the lens is rotated once around the optical axis. According to such a configuration, the amount of the liquid material applied in the first step is stabilized, so that the thickness of the light shielding layer is stabilized.

  In the present invention, it is preferable that the rotation speed of the lens in the first step is lower than the rotation speed of the lens in the second step. According to this configuration, in the first step, the liquid material can be prevented from being spread to the outer peripheral side due to the centrifugal force.

In this case, when rotating the lens in the second step, the suction mechanism causes the lens to rotate.
Preferably, air is sucked upward through the hood around the lens . According to this configuration, even when the liquid material scatters upward from the lens as droplets when the lens receiving base is rotated at a high speed, the liquid material is removed from around the lens by the air flow. For this reason, it is possible to suppress the scattered liquid material from adhering to the lens.

In the present invention, in the third step, the lens is rotated one or more times around the optical axis while supplying the liquid from a liquid discharge nozzle toward a boundary between the annular outer peripheral surface and the first annular surface, A mode of rotating can be adopted. According to this configuration, the third step can be performed efficiently. In the present invention, the liquid discharge nozzle used in the first step is different from the liquid discharge nozzle used in the third step, the liquid discharge nozzle used in the first step, and the liquid discharge nozzle used in the third step Any of the configurations common to the nozzle may be adopted.

  In this case, in the third step, for example, the lens is rotated once around the optical axis. According to such a configuration, the amount of the liquid material applied in the third step is stabilized, so that the thickness of the light shielding layer is stabilized.

  In the present invention, it is preferable that the rotation speed of the lens in the third step is lower than the rotation speed of the lens in the fourth step. According to this configuration, in the third step, the liquid material can be prevented from spreading to the outer peripheral side due to the centrifugal force.

In the present invention, in the third step and the fourth step, the lens is supported by a lens holder with the one surface facing upward, and when the lens is rotated in the fourth step, the lens is positioned at an upper position of the lens. It is preferable that air is blown from an air nozzle to the center of the lens surface, and that the air is sucked upward or downward around the lens via a hood by a suction mechanism . According to such a configuration, on one surface side of the lens, an airflow is generated from the inside in the radial direction to the outside in the radial direction. For this reason, in the fourth step, even if the liquid material flowing along the annular inner peripheral surface of the lens scatters as a droplet or the like to the outside in the radial direction of the lens, the scattered liquid material is prevented from adhering to the lens. be able to. Further, when the lens holder is rotated at a high speed in the fourth step, even if the liquid material scatters from the lens as droplets or the like, the liquid material is removed from around the lens by an air flow. For this reason, it is possible to suppress the scattered liquid material from adhering to the lens.

In this case, when rotating the lens in the fourth step, it is preferable that the suction mechanism sucks air around the lens upward through the hood by the suction mechanism . When the lens holder is rotated at a high speed in the fourth step, even if the liquid material scatters upward from the lens as droplets or the like, the liquid material is removed from around the lens by an air flow. For this reason, it is possible to suppress the scattered liquid material from adhering to the lens.

  In the present invention, when supplying the liquid material from the liquid material discharge nozzle, it is preferable to control the temperature of the liquid material. According to this configuration, the viscosity of the liquid material is stabilized, so that the applied thickness of the liquid material is stabilized. Therefore, the thickness of the light shielding layer is stabilized.

  In the present invention, in the first step, after the liquid material for forming the light shielding layer is applied along the inner edge of the outer peripheral portion where the light shielding layer of the lens is to be formed, in the second step, the viscosity of the liquid material and the thickness of the light shielding layer are increased. The lens is rotated around the optical axis at a speed corresponding to the speed and the like, and the liquid material flows radially outward by centrifugal force. Therefore, unlike the case where the liquid material is applied by the application head made of the felt-like material, the situation where the amount of the liquid material seeping into the application head fluctuates and the application amount of the light-shielding layer varies does not occur. Therefore, the liquid material for forming the light shielding layer can be appropriately applied to the outer peripheral portion, and the thickness of the light shielding layer is stabilized.

It is explanatory drawing of the lens with a light shielding layer which concerns on the reference example of this invention . FIG. 3 is an explanatory diagram of a lens with a light-blocking layer according to an example of the present invention . It is a perspective view of the manufacturing device of the lens with a light shielding layer to which the present invention is applied. FIG. 4 is a cross-sectional view of a main part of a device for manufacturing the lens with a light-shielding layer shown in FIG. 3. FIG. 4 is an exploded perspective view of a main part of the apparatus for manufacturing a lens with a light-shielding layer shown in FIG. FIG. 4 is a cross-sectional view around an air nozzle of the apparatus for manufacturing a lens with a light-shielding layer shown in FIG. 3. It is explanatory drawing which shows the manufacturing method of the lens with a light shielding layer which concerns on the reference example of this invention . It is explanatory drawing which shows the Example of the manufacturing method of the lens with a light shielding layer to which this invention is applied. It is explanatory drawing of the improvement example of the lens cradle of the manufacturing apparatus of the lens with a light shielding layer to which this invention is applied. It is sectional drawing of the lens holder shown in FIG. FIG. 10 is an exploded perspective view of the lens holder shown in FIG. 9.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

[Configuration of lens with light-shielding layer]
FIG. 1 is an explanatory view of a lens with a light-blocking layer according to a reference example of the present invention. FIGS. 1A , 1B , 1C , and 1D are perspective views of the lens and cross-sectional views of the lens, respectively. FIG. 3 is a perspective view of a lens with a light-shielding layer, and a cross-sectional view of the lens with a light-shielding layer. 2A and 2B are explanatory views of a lens with a light-blocking layer according to an example of the present invention. FIGS. 2A , 2B , 2C , and 2D are perspective views of the lens and cross-sectional views of the lens, respectively. FIG. 3 is a perspective view of a lens with a light-shielding layer, and a cross-sectional view of the lens with a light-shielding layer.

  The lens 1 with the light shielding layer shown in FIGS. 1C and 1D has an outer peripheral portion surrounding the concave lens surface 14 on the one surface 11 side of the lens 10 shown in FIGS. 15, a black light-shielding layer 3 called so-called black is formed to prevent unnecessary light incidence and reflection.

  In this embodiment, on the one surface 11 side of the lens 10, on the outer peripheral portion 15, a first annular surface 17 surrounding the lens surface 14 on the radial outside, and a first annular surface 17 on the radial outside of the first annular surface 17. A second annular surface 19 that protrudes further toward the one surface 11 side, and an annular inner peripheral surface 18 that is inclined obliquely upward and that is an inclined surface that connects the first annular surface 17 and the second annular surface 19 are provided. The inside of the annular inner peripheral surface 18 is a recess 16. In the lens 10 having such a configuration, the light shielding layer 3 is formed on the first annular surface 17, the annular inner peripheral surface 18, and the second annular surface 19. The light shielding layer 3 may be formed on the other surface 12 side of the lens 10 in some cases.

  The lens 2 with the light shielding layer shown in FIGS. 2C and 2D has an outer peripheral portion surrounding the concave lens surface 24 on the one surface 21 side of the lens 20 shown in FIGS. 25, a black light-shielding layer 3 called so-called black is formed to prevent unnecessary light incidence and reflection.

  In the present embodiment, on the one surface 21 side of the lens 20, a first annular surface 27 that radially surrounds the lens surface 24 on the outer peripheral portion 25, and a first annular surface 27 that is radially outside the first annular surface 27. A second annular surface 29 that is recessed toward the other surface 12 is provided, and an annular outer peripheral surface 28 that connects the first annular surface 27 and the second annular surface 29 is provided. In the lens 20 having such a configuration, the light shielding layer 3 is formed on the first annular surface 27, the annular outer peripheral surface 28, and the second annular surface 29. The light shielding layer 3 may be formed on the other surface 22 side of the lens 20 in some cases.

  Here, the light-shielding layer 3 shown in FIGS. 1 and 2 is formed of a coating film obtained by applying a liquid material 30 for forming a light-shielding layer and then scattering and solidifying a solvent. The thickness of the light shielding layer 3 is, for example, 5 to 10 μm.

[Device for manufacturing lens with light-shielding layer]
(overall structure)
FIG. 3 is a perspective view of a manufacturing apparatus 40 for a lens with a light-shielding layer to which the present invention is applied. FIG. 4 is a cross-sectional view of a main part of the apparatus 40 for manufacturing a lens with a light-shielding layer shown in FIG. 5 is an exploded perspective view of a main part of the manufacturing apparatus 40 of the lens with a light-shielding layer shown in FIG. 3, wherein FIG. 5 (a) is an exploded perspective view with a hood removed, and FIG. 5 (b) shows an air nozzle. It is an exploded perspective view in the state where it was removed.

  The manufacturing apparatus 40 shown in FIGS. 3, 4 and 5 is an apparatus for forming the light shielding layer 3 when manufacturing the lenses 1 and 2 with the light shielding layer described with reference to FIGS. In the following description, a case where the lens 10 is mounted on the manufacturing apparatus 40 to manufacture the lens 1 with the light-shielding layer among the lenses 10 and 20 will be mainly described.

  The manufacturing apparatus 40 according to the present embodiment is configured as a spin coater, and has a lens receiving base 60 that supports the lens 10 with one surface 11 facing upward, and a light-shielding layer formed on the inner edge of a region where the light-shielding layer 3 of the lens 10 is to be formed. A liquid discharge nozzle 90 for supplying a liquid material for use, a rotation driving mechanism 70 for rotating the lens receiving base 60 around the optical axis L of the lens 10, and a fixed base 50 for supporting the rotation driving mechanism 70 and the like. ing.

  The liquid discharge nozzle 90 is connected to a container 95 for storing the liquid via a pipe 96. The liquid material is obtained by dispersing a black colorant in a solvent, and the viscosity changes depending on the temperature. Therefore, a temperature adjusting device 97 for adjusting the temperature of the liquid discharged from the liquid discharge nozzle 90 is provided at at least one of the liquid discharge nozzle 90, the container 95, and the pipe 96. In the present embodiment, a heater 98 is provided in the container 95 as the temperature adjusting device 97, and the liquid material is adjusted to a temperature of, for example, 35 ° C., and is discharged from the liquid discharge nozzle 90.

  As shown in FIGS. 4 and 5, the lens receiving base 60 is connected to the upper end of the rotation shaft 71 of the rotation driving mechanism 70 and supports the lens 10 with one surface 11 facing upward. The lens support 60 has a cylindrical portion 61 whose upper end supporting the lens 10 has a shape corresponding to the other surface 12 of the lens 10. When the lens 10 is installed in the cylindrical portion 61, the lens 10 is aligned. Is done. As a result, the optical axis L of the lens 10 coincides with the center axis L71 of the rotation axis 71. In the lens receiving base 60, a lens adsorbing portion 65 that adsorbs the other surface 12 of the lens 10 is provided at the bottom of the cylindrical portion 61. As the lens suction unit 65, a vacuum suction chuck or an adhesive sheet can be used. In this embodiment, an adhesive sheet is used as the lens suction unit 65.

As shown in FIGS. 3 and 4, in the rotation driving mechanism 70, the rotation shaft 71 is connected to a motor 75, and when the rotation shaft 71 rotates about the center axis L71, the lens receiving base 60 moves the optical axis L And about the central axis L71. When rotating the rotation shaft 71 in the rotation drive mechanism 70, in addition to the configuration in which the motor 75 is directly connected to the rotation shaft 71, the rotation shaft 71 and the motor 75 are connected via a transmission mechanism such as a pulley or a belt. May be adopted.

  The motor 75 is fixed to the base plate 51 of the fixed base 50. The fixed base 50 includes a plurality of support shafts 52 extending upward from the base plate 51, a support plate 53 fixed to an upper end of the support shaft 52, and a plurality of support shafts extending upward from the support plate 53. It has a shaft 54 and a support plate 58 fixed to the upper end of the support shaft 54.

  The first plate 55 is fixed to the upper surface of the support plate 58. The first plate 55 includes a disc-shaped bottom plate portion 551 having a hole 555 for projecting the rotation shaft 71 and the lens holder 60 upward, and a side plate portion 552 protruding upward from an outer edge of the bottom plate portion 551. Have. The circular bottom plate portion 561 of the second plate 56 is fixed to the upper surface of the bottom plate portion 551 of the first plate 55. The bottom plate portion 561 communicates with the hole 555 of the first plate 55, and A cylindrical portion 565 that protrudes the lens receiving base 60 upward is formed. The bottom plate portion 561 of the second plate 56 has a smaller diameter than the bottom plate portion 551 of the first plate 55, and inside the side plate portion 552 of the first plate 55, the side plate portion 562 projects upward from the outer edge of the bottom plate portion 561. . As a result, the lower side around the lens receiving base 60 is partitioned by the bottom plate portion 551 of the first plate 55, and the first plate 55 and the second plate 56 scatter when the liquid material is applied to the lens 10. A collecting unit for collecting the liquid droplets of the liquid material is formed.

(Configuration of Hood 87 and Air Nozzle 81)
FIG. 6 is a cross-sectional view around the air nozzle 81 of the apparatus 40 for manufacturing a lens with a light-shielding layer shown in FIG. 3. FIGS. 6A and 6B are cross-sectional views when the lens 10 is omitted, and FIG. FIG. 10 is a sectional view when FIG.

  As shown in FIG. 3, in the manufacturing apparatus 40 of the present embodiment, a cover 88 that covers the upper side of the lens receiving base 60 is provided, and the cover 88 sucks air from inside the cover 88 to the upper side of the cover 88. A suction mechanism 89 is provided. In the present embodiment, the cover 88 includes a tubular portion 881 to which the duct 891 of the suction mechanism 89 is connected, and a tubular conical portion 882 whose diameter is diagonally increased downward from the tubular portion 881.

  As shown in FIGS. 4 and 5, in the manufacturing apparatus 40 of the present embodiment, an air nozzle 81 that blows air to the lens surface 14 at a position above the lens 10 is provided. In this embodiment, the air nozzle 81 is movable together with the cover 88 and connected to the lifting device 80. More specifically, the air nozzle 81 and the cover 88 are connected to a lifting / lowering device 80, and the air nozzle 81 and the cover 88 can be moved in the vertical direction of the lens 10 by the lifting / lowering device 80.

  In order to realize such a configuration, a connecting plate 883 is formed at the lower end of the cover 88, and the cover 88 is connected to the cylindrical connecting member 85 via the connecting plate 883. The connecting member 85 includes an annular flange portion 851 connected to the cover 88, an arm portion 852 extending radially inward from the flange portion 851, and an annular portion connected to a radially inner end of the arm portion 852. A cylindrical nozzle holder 86 holding the air nozzle 81 inside is held inside the annular portion 853. In the present embodiment, as shown in FIG. 6, the tip 811 of the air nozzle 81 projects downward from the lower end 861 of the nozzle holder 86.

  As shown in FIGS. 3, 4, and 5, in the connecting member 85, a cylindrical tubular portion 855 projects downward from the flange portion 851, and the tubular portion 855 surrounds the lens receiving base 60. In. Therefore, in this embodiment, the cover 88 and the cylindrical portion 855 of the connecting member 85 constitute a hood 87 that covers the lens receiving base 60 from above and around.

  In the connecting member 85, an annular ring 84 connected to the connecting member 85 on the lower surface of the flange portion 851 is connected to the upper end of the cylindrical portion 855. A connection plate 840 projecting outward in the radial direction is formed on the ring 84, and the connection plate 840 is connected to the lifting device 80 shown in FIG.

  3, the lifting device 80 has a fixed plate 804 and a cylinder device 805 supported by the fixed plate 804. An output shaft 806 of the cylinder device 805 is connected to a connecting plate 840 via a movable member 807. Are linked. Therefore, when the cylinder device 805 is operated, the connecting member 85, the cover 88, and the air nozzle 81 can be moved up and down. Therefore, the air nozzle 81 and the hood 87 can move between a position that appears above the lens 10 and a position that retreats further upward from above the lens 10 and opens above the lens 10.

[ Reference example of manufacturing method of lens with light shielding layer]
(Production method)
FIG. 7 is an explanatory diagram illustrating a method for manufacturing a lens with a light-shielding layer according to a reference example of the present invention . The method for manufacturing the lens 1 with the light-shielding layer will be described with reference to FIG. 7, but in the following description, FIG. 3, FIG. 4, FIG. 5, and FIG.

  In manufacturing the lens 1 with the light shielding layer shown in FIG. 1, first, after forming the lens 10 shown in FIG. 7A, the lens 10 is arranged on the lens receiving base 60 of the manufacturing apparatus 40.

  Next, in the first step, a liquid material 30 for forming a light-shielding layer is applied over the entire periphery along the inner edge of the outer peripheral portion 15 of the lens 10 (the inner edge of the first annular surface 17). In the present embodiment, while the liquid 30 is supplied from the liquid discharge nozzle 90 toward the inner edge of the outer peripheral portion 15 of the lens 20, the lens holder 60 holding the lens 10 is rotated one or more times around the optical axis L by the first rotation. The liquid material 30 for forming a light-shielding layer is applied over the entire circumference along the inner edge of the outer peripheral portion 15 by rotating at a speed. In the present embodiment, the lens holder 60 holding the lens 10 is rotated around the optical axis L by one rotation. In the first step, the air nozzle 81, the hood 87, and the connecting member 85 are in a state of being retracted further upward from above the lens 10 and opening the upper side of the lens 10.

  Next, in the second step, the lens holder 60 supporting the lens 10 is rotated around the optical axis L at a second speed higher than the first speed, and the liquid material 30 flows radially outward by centrifugal force. The liquid material 30 is applied to the outer peripheral portion 15 (the first annular surface 17, the annular inner peripheral surface 18, and the second annular surface 19). The rotation speed of the lens holder 60 in the second step is, for example, 5,000 to 30,000 rpm. During that time, the solvent evaporates from the liquid material 30, and the light-shielding layer 3 is formed.

  When the second step is performed, the air nozzle 81, the hood 87, and the connecting member 85 are in a state of being lowered to the upper side of the lens 10. At this time, as shown in FIG. 6B, the tip 811 of the air nozzle 81 is located in the concave portion 16 surrounded by the annular inner peripheral surface 18 of the lens 10. Further, the lower end portion 861 of the nozzle holder 86 is in a state where the opening of the concave portion 16 is partially closed around the air nozzle 81. Therefore, in the concave portion 16 of the lens 10, an outward airflow is generated from the center of the concave portion 16 (the center of the lens surface 14) along the concave portion 16, as shown by a dotted arrow S in FIG.

If the liquid material 30 cannot be sufficiently applied to the second annular surface 19 in the second step due to the angle of the annular inner peripheral surface 18 of the lens 10 or the like, in the third step shown in FIG. While supplying the liquid 30 from the liquid discharge nozzle 90 toward the inner edge of the second annular surface 19, the lens holder 60 holding the lens 10 is rotated about the optical axis L by one or more rotations at a third speed. A liquid material 30 for forming a light-shielding layer is applied over the entire circumference along the inner edge of the second annular surface 19. In the present embodiment, the lens holder 60 holding the lens 10 is rotated around the optical axis L by one rotation. In the third step, the air nozzle 81, the hood 87, and the connecting member 85 are in a state of being retracted further upward from above the lens 10 and opening the upper part of the lens 10. Next, in a fourth step, the lens holder 60 supporting the lens 10 is rotated around the optical axis L at a fourth speed higher than the third speed, and the liquid 30 is caused to flow radially outward by centrifugal force. The liquid material 30 is applied to the second annular surface 19. The rotation speed of the lens holder 60 in the fourth step is, for example, 5,000 to 30,000 rpm. In the fourth step, similarly to the second step, it is preferable that the air nozzle 81, the hood 87, and the connecting member 85 be lowered to the upper side of the lens 10, as shown in FIG.

( Main effects of reference example of manufacturing method )
As described above, in this example, in the first step, the liquid material 30 for forming the light-shielding layer is applied over the entire periphery along the inner edge of the outer peripheral portion 15 of the lens 10, and then, in the second step, the liquid substance 30 is formed. The lens holder 60 supporting the lens 10 is rotated around the optical axis L at a speed corresponding to the viscosity of the light-shielding layer 3 and the thickness of the light-shielding layer 3, and the liquid material 30 flows radially outward by centrifugal force. 15 is coated with a liquid material 30. For this reason, unlike the case where the coating head made of a felt-like material is used, a situation in which the amount of liquid material seeping into the coating head fluctuates does not occur. Therefore, the liquid material 30 for forming the light shielding layer 3 can be appropriately applied to the outer peripheral portion, and the thickness of the light shielding layer 3 is stabilized.

  In the first step, the lens holder 60 holding the lens 10 is rotated one or more times around the optical axis L while supplying the liquid 30 from the liquid discharge nozzle 90 toward the inner edge of the outer peripheral portion 15 of the lens 10. , The first step can be performed efficiently. Further, in the first step, the lens holder 60 holding the lens 10 is rotated once around the optical axis L, so that the amount of the liquid material 30 applied in the first step is stabilized. Therefore, the thickness of the light shielding layer 3 is stabilized.

  In addition, since the rotation speed (first speed) of the lens holder 60 in the first step is lower than the rotation speed (second speed) of the lens holder 60 in the second step, the liquid 30 is subjected to centrifugal force in the first step. Thereby, it can be suppressed from spreading to the outer peripheral side.

  In the present embodiment, on the one surface 11 side of the lens 10, on the outer peripheral portion 15, a second annular surface 19 protruding from the first annular surface 17 to the one surface 11 side radially outside the first annular surface 17 is provided. An annular inner peripheral surface 18 is provided which is inclined obliquely upward and connects the first annular surface 17 and the second annular surface 19. Therefore, during the second step, the liquid material 30 flowing along the annular inner peripheral surface 18 of the lens 10 is removed from the lens 10 as shown by the solid arrow M in FIGS. 6B and 7B. Easily scattered as droplets and the like on the outside of the surface. However, in the present embodiment, the hood 87 is arranged around the lens 10, and air is sucked upward from the inside of the hood 87 by the suction mechanism 89. For this reason, even if the liquid 30 scatters from the lens 10 as droplets or the like, the liquid 30 is sucked to the outside of the hood 87. Therefore, it is possible to suppress the scattered liquid material 30 from adhering to the lens 10.

In addition, the air nozzle 81 generates an airflow from the inside in the radial direction to the outside on the one surface 11 side of the lens 10. In particular, since the tip 811 of the air nozzle 81 is located in the concave portion 16 surrounded by the annular inner peripheral surface 18 of the lens 10, an airflow from the radially inner side to the outer side is efficiently generated. Therefore, even if the liquid material 30 flowing along the annular inner peripheral surface 18 of the lens 10 scatters as droplets outside the lens 10, it is possible to prevent the scattered liquid material 30 from adhering to the lens 10. Can be. Further, since the lower end portion 861 of the nozzle holder 86 partially covers the opening of the concave portion 16 of the lens 10 around the air nozzle 81, the lens surface on which the scattered liquid material 30 is located in the concave portion 16 of the lens 10 14 can be reliably suppressed.

  Furthermore, since the temperature adjusting device 97 for adjusting the temperature of the liquid 30 supplied from the liquid discharge nozzle 90 is provided, the viscosity of the liquid 30 is stabilized. Therefore, since the applied thickness of the liquid material 30 is stabilized, the thickness of the light shielding layer 3 is stabilized.

[ Example of manufacturing method of lens with light shielding layer]
(Production method)
FIG. 8 is an explanatory view showing an embodiment of a method for manufacturing a lens with a light-shielding layer to which the present invention is applied. The method of manufacturing the lens 2 with the light-shielding layer will be described with reference to FIG. 8, but in the following description, FIG. 3, FIG. 4, FIG. 5, and FIG.

  In manufacturing the lens 2 with the light shielding layer illustrated in FIG. 2, first, the lens 20 illustrated in FIG. 8A is formed, and then the lens 20 is disposed on the lens holder 60 of the manufacturing apparatus 40. In this example, the air nozzle 81, the hood 87, and the connecting member 85 are retracted further from the upper side of the lens 20 to open the upper side of the lens 20. However, in the first step and the third step, the air nozzle 81, the hood 87 and the connecting member 85 are retracted further from the upper side of the lens 20, and in the second step and the fourth step, the air nozzle 81, the hood 87 and the connecting member are connected. The member 85 may be lowered.

  Next, in the first step, the liquid material 30 for forming the light-shielding layer is applied over the entire periphery along the inner edge of the outer peripheral portion 25 of the lens 20 (the inner edge of the first annular surface 27). In the present embodiment, while the liquid 30 is supplied from the liquid discharge nozzle 90 toward the inner edge of the outer peripheral portion 25 of the lens 20, the lens holder 60 holding the lens 20 is rotated one or more times around the optical axis L by the first rotation. The liquid material 30 for forming a light-shielding layer is applied over the entire circumference along the inner edge of the outer peripheral portion 25 by rotating at a speed. In this embodiment, the lens holder 60 holding the lens 20 is rotated about the optical axis L by one rotation.

  Next, as shown in FIG. 8B, in the second step, the lens holder 60 supporting the lens 20 is rotated around the optical axis L at a second speed higher than the first speed, and the liquid is rotated by centrifugal force. The liquid 30 is applied to the first annular surface 27 by flowing the object 30 radially outward. The rotation speed of the lens holder 60 in the second step is, for example, 5,000 to 30,000 rpm.

  At the time of the second step, on the one surface 21 side of the lens 20, on the outer peripheral portion 25, a second annular recessed toward the other surface 22 side from the first annular surface 27 radially outside the first annular surface 27. Since the surface 29 and the annular outer peripheral surface 28 connecting the first annular surface 27 and the second annular surface 29 are provided, at the time of the second step, on the radially outer side of the step (the annular outer peripheral surface 28), As shown by the arrow N, the liquid 30 scatters, and it is difficult to appropriately apply the liquid 30 to the annular outer peripheral surface 28 and the second annular surface 29.

  Therefore, in the present embodiment, after the second step, in a third step shown in FIG. 8C, the liquid material 30 is applied over the entire circumference along the boundary between the annular outer peripheral surface 28 and the first annular surface 27. In this embodiment, while the liquid 30 is supplied from the liquid discharge nozzle 90 toward the boundary between the annular outer peripheral surface 28 of the lens 20 and the first annular surface 27, the lens holder 60 holding the lens 20 is moved along the optical axis L. The liquid material 30 is rotated around at least one rotation at a third speed, and the liquid material 30 is applied over the entire circumference along the boundary between the annular outer peripheral surface 28 and the first annular surface 27. In this embodiment, the lens holder 60 holding the lens 20 is rotated about the optical axis L by one rotation.

Next, as shown in FIG. 8D, in a fourth step, the lens holder 60 supporting the lens 20 is rotated around the optical axis L at a fourth speed higher than the third speed, and the liquid The object 30 is caused to flow radially outward, and the liquid object 30 is applied to the annular outer peripheral surface 28 and the second annular surface 29.
During that time, the solvent evaporates from the liquid material 30, and the light-shielding layer 3 is formed. The rotation speed of the lens holder 60 in the fourth step is, for example, 5,000 to 30,000 rpm.

(Main effects of the embodiment of the manufacturing method)
As described above, in this example, in the first step, the liquid material 30 for forming the light-shielding layer is applied over the entire periphery along the inner edge of the outer peripheral portion 25 of the lens 20, and then, in the second step, the liquid material 30 is formed. The lens holder 60 supporting the lens 20 is rotated around the optical axis L at a speed corresponding to the viscosity of the light-shielding layer 3 and the thickness of the light-shielding layer 3, and the liquid material 30 flows radially outward by centrifugal force. 25 is coated with a liquid material 30. For this reason, unlike the case where the coating head made of a felt-like material is used, a situation in which the amount of liquid material seeping into the coating head fluctuates does not occur. Therefore, the liquid material 30 for forming the light shielding layer 3 can be appropriately applied to the outer peripheral portion, and the thickness of the light shielding layer 3 is stabilized. In the first step, the lens holder 60 holding the lens 20 is rotated one or more times around the optical axis L while supplying the liquid 30 from the liquid discharge nozzle 90 toward the inner edge of the outer peripheral portion 25 of the lens 20. , The first step can be performed efficiently.

  In the first step, the lens holder 60 holding the lens 20 is rotated once around the optical axis L, so that the amount of the liquid material 30 applied in the first step is stable. Therefore, the thickness of the light shielding layer 3 is stabilized. In addition, since the rotation speed (first speed) of the lens holder 60 in the first step is lower than the rotation speed (second speed) of the lens holder 60 in the second step, the liquid 30 is subjected to centrifugal force in the first step. Thereby, it can be suppressed from spreading to the outer peripheral side.

  Further, in the present embodiment, at the time of the second step, the liquid material 30 is scattered radially outside the step portion (the annular outer peripheral surface 28) as shown by an arrow N, and the annular outer peripheral surface 28 and the second annular surface 29 are formed. It is difficult to properly apply the liquid material 30 to the liquid. However, in the present embodiment, after the second step, in the third step shown in FIG. 8C, the liquid material 30 is applied over the entire circumference along the boundary between the annular outer peripheral surface 28 and the first annular surface 27. In the fourth step shown in FIG. 8D, the lens holder 60 supporting the lens 20 is rotated around the optical axis L at a fourth speed higher than the third speed, and the diameter of the liquid material 30 is reduced by centrifugal force. The liquid material 30 is applied to the annular outer peripheral surface 28 and the second annular surface 29 by flowing outward in the direction. Therefore, the light shielding layer 3 can be appropriately formed on the entire outer peripheral surface 25 of the lens 20. In the third step, since the lens holder 60 holding the lens 10 is rotated once around the optical axis L, the amount of the liquid 30 applied in the third step is stabilized. Therefore, the thickness of the light shielding layer 3 is stabilized. In addition, since the rotation speed (third speed) of the lens holder 60 in the third step is lower than the rotation speed (fourth speed) of the lens holder 60 in the fourth step, the liquid 30 is subjected to centrifugal force in the fourth step. Thereby, it can be suppressed from spreading to the outer peripheral side.

  Further, since the temperature adjusting device 97 for adjusting the temperature of the liquid 30 supplied from the liquid discharge nozzle 90 is provided, the viscosity of the liquid 30 is stabilized. Therefore, since the applied thickness of the liquid material 30 is stabilized, the thickness of the light shielding layer 3 is stabilized.

[Improved lens holder]
FIGS. 9A and 9B are explanatory views of an improved example of the lens receiving base 60 of the apparatus 40 for manufacturing a lens with a light-shielding layer to which the present invention is applied. FIGS. 9A and 9B are perspective views of the lens receiving base 60 and the like. FIG. 9 is a perspective view showing a state where a second plate 56 is detached from the lens receiving base 60. FIG. 10 is a sectional view of the lens holder 60 shown in FIG. FIG. 11 is an exploded perspective view of the lens receiving base 60 shown in FIG. 9, and FIGS. 11A and 11B are exploded perspective views of a state where a holder is removed and a state where a first cylindrical portion is further removed. FIG. 3 is an exploded perspective view of FIG. 9, 10, and 11 illustrate a state in which the lens 10 illustrated in FIG. 1 is supported by the lens receiving base 60.

As shown in FIGS. 9, 10, and 11, the lens holder 60 used in the manufacturing apparatus 40 according to the present embodiment includes a lens suction unit 65 that suctions the other surface 12 of the lens 10 at the upper end side of the rotation shaft 71, A first cylindrical portion 66 configured to be movable up and down around the lens attraction portion 65, and a second cylindrical portion 67 receiving the other surface 12 of the lens 10 between the first cylindrical portion 66 and the lens attraction portion 65. And As the lens suction section 65, a vacuum suction chuck or an adhesive sheet provided on the bottom 671 of the second cylindrical section 67 can be used. In this embodiment, an adhesive sheet is used as the lens suction section 65.

  The first cylindrical portion 66 has a cylindrical portion 661 that receives the outer peripheral side of the other surface 12 of the lens 10, and a flange portion 662 that projects radially outward at a lower end portion of the cylindrical portion 661. Further, a flange portion 712 protruding radially outward is formed on the upper end side of the rotating shaft 71. An urging member 68 made of a coil spring is arranged between the flange 662 and the flange 712, and the urging member 68 urges the first cylindrical portion 66 upward.

  In the present embodiment, the second cylinder 67 is formed at the upper end of a cylindrical cylinder 670 extending coaxially with the center axis L71 of the rotating shaft 71. The cylindrical body 670 and the rotary shaft 71 are fixed to the shaft hole 672 facing downward in the cylindrical body 670 by fitting a small-diameter portion 713 formed on the distal end side of the flange 712 on the rotary shaft 71. The tubular body 670 is fitted inside the first tubular portion 66, and functions as a guide when the first tubular portion 66 moves in the vertical direction. The first cylindrical portion 66 has an elongated hole 669 extending parallel to the central axis L71 of the rotating shaft 71. The elongated hole 669 has a shaft portion projecting radially outward from the cylindrical body 670. 679 is fitted. In this manner, the anti-idling mechanism 69 is configured between the first cylindrical portion 66 and the cylindrical body 670 by the shaft portion 679 and the elongated hole 669.

  The lower end of the rotary shaft 71 from the flange portion 712 is rotatably supported by two bearings 58 and 59 inside the holder 57 of the fixed base 50. A second plate 56 having a hole 566 through which the lens receiving base 60 penetrates upward is fixed to the upper surface of the holder 57.

  In the lens receiving base 60 configured as described above, the first cylindrical portion 66 is located above without the lens 10 being disposed. Here, on the other surface 12 side of the lens 10, two annular steps 121 and 122 are formed on the outer peripheral side, and when the lens 10 is disposed on the lens receiving base 60, the cylindrical portion of the first cylindrical portion 66 is formed. Reference numeral 661 contacts the outer peripheral side annular step portion 121.

  In this state, when the lens 10 is arranged on the first cylindrical portion 66 and pressed downward, the first cylindrical portion 66 moves downward, and the upper end of the second cylindrical portion 67 is moved to the annular step portion 122 on the inner peripheral side. The alignment is performed on the lens 10 in contact with the lens. Further, the other surface 12 of the lens 10 is held by the lens suction unit 65. Therefore, the lens 10 is reliably supported by the lens holder 60.

  After the light-shielding layer 3 is formed on the lens 10 to manufacture the lens 1 with the light-shielding layer, the first cylindrical portion 66 is pushed down. , The lens 1 with the light-shielding layer can be easily taken out.

[Other embodiments]
The manufacturing apparatus 40 may be used alone, or may be combined with a transport device of a turntable type or the like. When combined with a transport device of a turntable type or the like, an area for supplying the lenses 10 and 20 and collecting the lenses 1 and 2 with the light shielding layer along the transport direction of the lenses 10 and 20; an area for performing the first step; And an area for performing the second step. Further, when performing the third step and the fourth step, an area for performing the third step and an area for performing the fourth step are provided downstream of the area for performing the second step.

  In the above embodiment, the air nozzle 81 moves when the air nozzle 81 opens the upper part of the lens receiving base 60. However, the lens receiving base 60 moves downward, and the upper part of the lens receiving base 60 is opened. May be adopted.

  In the above-described embodiment, the suction mechanism 89 sucks the air inside the hood 855 upward, but a mode in which the air inside the hood 855 is sucked downward may be adopted.

  In the above-described embodiment, the inclined surfaces (the annular inner peripheral surface 18 and the annular outer peripheral surface 28) are provided on the outer peripheral portions 15 and 25 of the lenses 10 and 20. However, the outer peripheral portions 15 and 25 are configured by flat surfaces. The present invention may be applied to a case where a light-shielding layer is provided on a lens having a light-emitting element.

  In the above embodiment, when applying the liquid material 30 along the inner edges of the outer peripheral portions 15 and 25 of the lenses 10 and 20, the liquid material 30 is continuously discharged in the circumferential direction. The object 30 may be discharged.

  In the above-described embodiment, the step of applying the liquid material 30 along the inner edges of the outer peripheral portions 15 and 25 of the lenses 10 and 20 was performed by the manufacturing apparatus 40. However, the lens 10 and After applying the liquid material 30 along the inner edges of the outer peripheral portions 15 and 25 of the lens 20, the lenses 10 and 20 may be provided in the manufacturing apparatus 40.

  In the above embodiment, the third step and the fourth step are performed after the first step and the second step are performed. However, the first step and the third step may be performed before the second step. . According to this configuration, the liquid material can be caused to flow radially outward in the second step. Therefore, there is no need to perform the fourth step separately from the third step.

  In the above embodiment, the liquid material 30 is applied only along the inner edges of the outer peripheral portions 15 and 25 of the lenses 10 and 20, and then the liquid material 30 is caused to flow radially outward by centrifugal force. However, the liquid material 30 may be applied at least along the inner edges of the outer peripheral portions 15 and 25 of the lenses 10 and 20. For example, in addition to the inner edges of the outer peripheral portions 15 and 25 of the lenses 10 and 20, The liquid material 30 may be applied further radially outward than the inner edges of the outer peripheral portions 15 and 25, and then the liquid material 30 may be caused to flow radially outward by centrifugal force. Further, in addition to the inner edges of the outer peripheral portions 15 and 25 of the lenses 10 and 20, the liquid material 30 is applied to the entire outer peripheral portions 15 and 25 of the lenses 10 and 20, and then the liquid material is radially outwardly applied by centrifugal force. The thickness of the liquid material 30 on the outer peripheral portions 15 and 25 may be made uniform by flowing the liquid 30. According to such a configuration, the liquid material 30 can be applied to a wide area of the outer peripheral portion only by the second step.

1, 2,... Lens with light shielding layer, 3,... Light shielding layer, 10, 20,... Lens, 11, 21,. ..Outer peripheral portion, 16, 26 .. concave portion, 17, 27 .. first annular surface, 18 .. annular inner peripheral surface, 19, 29 .. second annular surface, 30 .. liquid material, 40 .. 50 fixed base, 60 lens receiving base, 61 cylindrical part, 65 lens adsorbing part, 66 first cylindrical part, 67 second cylindrical part, 68 biasing member, 70 ..Rotating drive mechanism, 71.Rotating shaft, 75.Motor, 80.Elevating device, 81.Air nozzle, 84.Ring, 85.Connecting member, 86.Nozzle holder, 87.Hood, 88 · · · cover (hood), 89 · · · suction mechanism, 90 · · · liquid material discharge nozzle, 97 · · · temperature control device, 98 · · · Motor, an annular stepped portion of the 121 and 122 ... lens, 805 ... cylinder device, the tip portion of 811 ... air nozzle, 855 ... tubular portion (hood), 861 the lower end of the ... nozzle holder, L ... light axis

Claims (11)

In a method for manufacturing a lens with a light-shielding layer in which a light-shielding layer is formed on an outer peripheral portion surrounding a concave lens surface on a radially outer side on at least one surface side of the lens,
After forming the lens, a first step of applying a liquid material for forming a light-shielding layer over the entire circumference along the inner edge of the outer peripheral portion,
After the first step, a second step of rotating the lens about the optical axis and causing the liquid to flow radially outward by centrifugal force;
Has,
In the first step and the second step, the lens is supported by a lens holder with the one surface facing upward,
When rotating the lens in the second step, air is blown from an air nozzle to the center of the lens surface at an upper position of the lens, and air is drawn upward or downward around the lens through a hood by a suction mechanism. Aspirate ,
The lens has a first annular surface radially outside the lens surface on the outer peripheral portion, and a concave portion radially outside the first annular surface from the first annular surface toward the other surface of the lens. A second annular surface, and an annular outer peripheral surface connecting the first annular surface and the second annular surface,
In the first step, after applying the liquid material over the entire periphery along the inner edge of the first annular surface as the inner edge of the outer peripheral portion, in the second step, the lens is rotated around an optical axis. To cause the liquid to flow radially outward by centrifugal force,
Thereafter, a liquid material for forming a light-shielding layer is applied over the entire circumference along a boundary between the annular outer peripheral surface and the first annular surface which is radially outwardly separated from an inner edge of the first annular surface to which the liquid material is applied. A third step,
A fourth step of rotating the lens about the optical axis and causing the liquid applied in the third step to flow radially outward by centrifugal force;
A method of manufacturing a lens with a light-shielding layer.   2. The method according to claim 1, wherein, in the first step, the lens is rotated one or more rotations around the optical axis while supplying the liquid material from the liquid material discharge nozzle toward the inner edge of the outer peripheral portion. A method for producing a lens with a light-shielding layer according to the above. The method according to claim 2, wherein in the first step, the lens is rotated once around the optical axis.   4. The method according to claim 2, wherein the rotation speed of the lens in the first step is lower than the rotation speed of the lens in the second step.   5. The method according to claim 1, wherein, when rotating the lens in the second step, the suction mechanism sucks air around the lens upward through the hood by the suction mechanism. 6. A method for manufacturing a lens with a light shielding layer. In the third step, the lens is rotated by at least one rotation around the optical axis while supplying the liquid material from a liquid discharge nozzle toward a boundary between the annular outer peripheral surface and the first annular surface. A method for producing a lens with a light-shielding layer according to any one of claims 1 to 5. 7. The method according to claim 6 , wherein in the third step, the lens is rotated once around the optical axis . 8. The method according to claim 6 , wherein the rotation speed of the lens in the third step is lower than the rotation speed of the lens in the fourth step . 9. In the third step and the fourth step, the lens is supported by a lens holder with the one surface facing upward,
When rotating the lens in the fourth step, air is blown from an air nozzle to the center of the lens surface at an upper position of the lens, and air is drawn upward or downward around the lens through a hood by a suction mechanism. The method for manufacturing a lens with a light-blocking layer according to claim 1, wherein the lens is suctioned . The method for manufacturing a lens with a light-shielding layer according to claim 9 , wherein, when the lens is rotated in the fourth step, air is suctioned upward around the lens via the hood by the suction mechanism. . 9. The method of manufacturing a lens with a light-shielding layer according to claim 2 , wherein the temperature of the liquid material is adjusted when the liquid material is supplied from the liquid material discharge nozzle. .

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