JP6411821B2 - Lens manufacturing apparatus and lens manufacturing method - Google Patents

Description

  The present invention relates to a lens manufacturing apparatus and a lens manufacturing method for manufacturing an optical lens.

  In recent years, a glass molding technique for producing a glass lens using a molding die is known (see, for example, Patent Documents 1 and 2). A glass lens produced by glass molding is also called a glass molded lens.

  In an optical lens, in order to prevent occurrence of flare and ghost during use, a roughening process is performed on the outer peripheral surface and the peripheral portion of the end surface (hereinafter collectively referred to as the outer peripheral portion). As a method of roughening the outer peripheral portion, conventionally, a radial thickness called a centering allowance is left on the outer peripheral portion of the lens, and this centering allowance is roughened during the centering step (for example, see Patent Document 1). A method of grinding using a grinding wheel is known.

  Patent Document 3 discloses a technique for producing a glass-molded lens having a roughened outer peripheral portion by performing glass molding using a mold having a roughened peripheral edge and side surfaces.

  Patent Document 4 discloses a technique for roughening the outer periphery by performing sandblasting after masking a part of an optical lens.

JP 2010-208873 A JP 2012-136377 A JP 2008-188845 A JP2013-218245A

  However, when the outer peripheral portion is roughened in the centering step, internal defects such as deep and fine cracks are generated in the lens when grinding the centering allowance. As a result, the impact strength of the lens becomes weak, and there is a problem that the lens is easily cracked or chipped by vibration or slight impact.

  In the case of the above-mentioned Patent Document 3, when the glass molded product is released, the tip of the fine projection group on the roughened glass surface is lacking in the shape of particles, and the molding of the molding die inside the molding die set is performed. May contaminate the surface. In such a case, it is better to wash the mold every time it is used, but this takes time and effort.

  Furthermore, in the case of the above-mentioned Patent Document 4, when the masking target surface has a curved surface, it still takes time and a lot of man-hours are required.

  The present invention has been made in view of the above, and a lens manufacturing apparatus and a lens manufacturing that can efficiently impart a predetermined range of roughness to the outer peripheral portion without reducing the strength of the lens and efficiently with a small number of man-hours. It aims to provide a method.

  In order to solve the above-described problems and achieve the object, a lens manufacturing apparatus according to the present invention provides a lens manufacturing apparatus that gives a predetermined range of roughness to the outer peripheral portion of an optical lens having two optical functional surfaces facing each other. The two optical function surfaces being in contact with each other, two support means for holding the optical lens facing each other, and the outer periphery of the optical lens held by the two support means A portion for contacting the two support means and the two optical functional surfaces has a closed shape, and each of the two support means includes: It has a sealing means which seals the area | region of the optical function surface inside the said closed shape part to contact | abut.

  The lens manufacturing apparatus further includes drive means for rotating the two support means around a common rotation axis.

  In the lens manufacturing apparatus, the sealing unit is an O-ring that can contact the optical functional surface.

  In the lens manufacturing apparatus, the sealing unit is an elastic member having a convex spherical surface that can come into contact with the optical function surface.

  In the lens manufacturing apparatus, the abrasive grain ejecting unit further includes a control unit that ejects the abrasive grains together with a gas and controls a pressure and a flow rate of the gas ejected by the abrasive grain ejecting unit. .

  The lens manufacturing apparatus may further include an adjusting unit that adjusts an injection direction of the abrasive grains ejected by the abrasive grain ejecting unit.

  The lens manufacturing method according to the present invention is a lens manufacturing method for imparting a predetermined range of roughness to an outer peripheral portion of an optical lens having two optical function surfaces facing each other, wherein two support means are used for the two optical functions. A lens support step of holding the optical lens in contact with each surface, and an abrasive injection step of injecting abrasive grains toward the outer peripheral portion of the optical lens held by the two support means The portions where the two support means and the two optical functional surfaces contact each other form a closed shape portion, and the lens support step is performed by the two support means from the closed shape portion where the two contact means contact each other. Is also characterized in that the region of the inner optical functional surface is sealed.

  In the lens manufacturing method, the abrasive grain spraying step is characterized in that the abrasive grains are sprayed on the outer peripheral portion while rotating the optical lens around the common rotation axis together with the two support means.

  In the lens manufacturing method, at least one of the two support means includes an O-ring, and the lens support step abuts the O-ring on the optical function surface.

  In the lens manufacturing method, at least one of the two support means includes an elastic member having a convex spherical surface, and the lens supporting step abuts the convex spherical surface on the optical function surface. To do.

  In the lens manufacturing method, at least one of the optical functional surfaces has a concave shape with a radius of curvature smaller than that of the convex spherical surface of the elastic member, and the lens supporting step includes the outer periphery of the at least one optical functional surface. The convex spherical surface is brought into contact with a circle to seal a region inside the outer circumferential circle.

  In the lens manufacturing method, at least one of the optical function surfaces has a planar shape, a convex shape, or a concave shape having a radius of curvature larger than or equal to the convex spherical surface of the elastic member. The convex spherical surface is brought into contact with the at least one of the optical functional surfaces, and a region where the convex spherical surface comes into contact is sealed.

  In the lens manufacturing method, at least one of the optical functional surfaces has a concave shape having a radius of curvature larger than that of the convex spherical surface of the elastic member, and the lens supporting step includes at least one optical of the optical functional surface. The convex spherical surface is brought into contact with the functional surface, pressed, and elastically deformed to seal the region from the inner side to the outer periphery of the optical functional surface.

  In the lens manufacturing method, the abrasive grain injection step is characterized by injecting the abrasive grains together with a gas having a pressure of 0.2 MPa to 0.7 MPa and a flow rate of 10 L / min to 20 L / min. .

  In the lens manufacturing method, the abrasive grain spraying step is characterized in that the abrasive grains are sprayed in a direction in which an angle with respect to a plane orthogonal to the rotation axis is not less than 0 ° and not more than 45 °.

  The lens manufacturing method further includes a step of manufacturing the optical lens by a heat softening molding method.

  According to the present invention, the optical lens is sandwiched while sealing the two optical functional surfaces by bringing the two support members into contact with the two optical functional surfaces of the optical lens. Since the abrasive grains are sprayed toward the portion, it is possible to impart a predetermined range of roughness to the outer peripheral portion efficiently without reducing the strength of the optical lens by suppressing generation of deep cracks and with less man-hours. As a result, it is possible to realize an optical lens that has sufficient impact resistance and is less likely to cause flare or ghost.

FIG. 1 is a schematic diagram showing a configuration of a lens manufacturing apparatus according to an embodiment of the present invention. FIG. 2 is a schematic diagram for explaining a preferable jetting direction of abrasive grains with respect to the optical lens shown in FIG. FIG. 3 is a schematic diagram for explaining a preferable jetting direction of abrasive grains with respect to the optical lens shown in FIG. FIG. 4 is a schematic diagram for explaining a preferable injection position of abrasive grains with respect to the optical lens shown in FIG. FIG. 5 is a flowchart showing the lens manufacturing method according to the embodiment of the present invention. FIG. 6 is a schematic diagram showing a part of a lens manufacturing apparatus according to Modification 1 of the embodiment of the present invention. FIG. 7 is a schematic diagram showing a part of a lens manufacturing apparatus according to Modification 2 of the embodiment of the present invention. FIG. 8 is a schematic diagram showing a part of a lens manufacturing apparatus according to Modification 3 of the embodiment of the present invention.

  Hereinafter, a lens manufacturing apparatus and a lens manufacturing method according to embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to these embodiments. Moreover, in description of each drawing, the same code | symbol is attached | subjected and shown to the same part.

(Embodiment)
FIG. 1 is a schematic diagram showing a configuration of a lens manufacturing apparatus according to an embodiment of the present invention. As shown in FIG. 1, the lens manufacturing apparatus 100 according to the present embodiment includes a first support portion 10 and a second support portion 20 that sandwich the optical lens 1, and the first support portion 10 and the second support portion 20. Are provided with an abrasive grain ejecting unit 30 that ejects abrasive grains toward the outer peripheral portion of the optical lens 1 sandwiched by the optical lens 1 and a control device 40 that controls the operation of the lens manufacturing apparatus 100.

  The optical lens 1 has two optical functional surfaces 1a and 1b facing each other. Each of the optical function surfaces 1a and 1b may have a convex shape, a concave shape, or a planar shape. In the present embodiment, as an example, a so-called meniscus lens in which one optical functional surface 1a is concave and the other optical functional surface 1b is convex is the object to be processed.

  The first support portion 10 and the second support portion 20 are in contact with the optical functional surfaces 1 a and 1 b to support the optical lens 1. The portions where the first support portion 10 and the second support portion 20 are in contact with the optical functional surfaces 1a and 1b are, for example, a closed shape portion such as a circular shape, a ball shape, or a spherical shape. 10 and the 2nd support part 20 seal the area | region of the optical function surfaces 1a and 1b inside the closed shape part which each contact | abuts.

  The first support portion 10 and the second support portion 20 are installed so as to be rotatable around a common rotation axis R, and are driven and rotated together by the drive device 15 while holding the optical lens 1.

  The first support portion 10 includes, as sealing means, a ball member 11 having a spherical shape formed of an elastic material such as rubber, and a ball holding member 12 that holds the ball member 11. The ball holding member 12 is a metal member in which a holding shaft 12b is provided on a cylindrical cup 12a. The ball member 11 is held by fitting the ball member 11 into the end of the cup 12a.

  The radius of curvature of the ball member 11 is preferably greater than or equal to the radius of curvature of the optical function surface 1a. More preferably, the radius of curvature of the ball member 11 is larger than the radius of curvature of the optical function surface 1a. In this case, the ball member 11 is in line contact with the outer circumference circle (edge edge) of the optical function surface 1a at the end face of the optical lens 1, and the inner area of the outer circumference circle can be sealed. When the radius of curvature of the ball member 11 is made equal to the radius of curvature of the optical function surface 1a, the ball member 11 is in surface contact with the entire optical function surface 1a and directly covers the optical function surface 1a. Furthermore, when the radius of curvature of the ball member 11 is smaller than the radius of curvature of the optical function surface 1a, the ball member 11 is brought into contact with the optical function surface 1a and pressed by the ball holding member 12 to be elastically deformed. The area | region where the member 11 contact | abuts to the optical function surface 1a can be expanded, and the area | region from the inner side of the said optical function surface 1a to an outer periphery can be covered. The shape of the ball member 11 does not have to be a perfect sphere, and may be a hemisphere or a sphere with no spherical surface as long as at least a portion in contact with the optical functional surface 1a is spherical.

  The hardness of the ball member 11 is appropriately adjusted according to the shape and strength of the optical lens 1, and 30 to 80 is preferable on a type A scale based on JISK6253. Moreover, as a material of the ball member 11, chloroprene rubber, nitrile rubber, polypropylene, silicon rubber, fluorine rubber, natural rubber, or the like is used. By using such an elastic material, the ball member 11 can be brought into close contact with the outer circumference circle of the optical function surface 1a, and the region inside the outer circumference circle can be sealed.

  The second support portion 20 includes an O-ring 21 formed of an elastic member such as rubber and an O-ring holding member 22 that holds the O-ring 21 as sealing means. The O-ring holding member 22 is a metal member in which a holding shaft 22b is provided on a dish portion 22a having a counterbore formed therein. The O-ring 21 is held by fitting the O-ring 21 into close contact with the inner peripheral portion of the dish portion 22a.

  Regarding the size of the O-ring 21, the outer diameter is preferably set to be equal to or larger than the diameter of the outer circumference circle of the optical function surface 1 b and the inner diameter is set smaller than the diameter of the outer circumference circle of the optical function surface 1 b. In this case, the O-ring 21 is in contact with the outer circumference circle (edge edge) of the optical function surface 1b to seal the entire optical function surface 1b. The outer diameter of the O-ring 21 may be smaller than the diameter of the outer circumferential circle of the optical function surface 1b. In this case, the region inside the circle (or ball) on the optical function surface 1b with which the O-ring 21 abuts. Can be sealed.

  The thickness (wire diameter) of the O-ring 21 is preferably changed as appropriate according to the radius of curvature of the optical function surface 1b. Specifically, in order to prevent interference with the inner bottom surface of the dish portion 22a of the optical function surface 1b, the smaller the radius of curvature of the optical function surface 1b, the thicker the O-ring 21 (the thicker the wire diameter).

  As with the ball member 11, the hardness of the O-ring 21 is preferably 30 to 80 on a type A scale conforming to JISK6253. Materials include chloroprene rubber, nitrile rubber, polypropylene, silicon rubber, fluorine rubber, natural rubber, and the like. Is used. By using such an elastic material, the O-ring 21 can be brought into close contact with the outer peripheral circle of the optical functional surface 1b or the optical functional surface 1b, and the region inside the tight circle can be sealed.

  The abrasive grain injection unit 30 is a mechanism that roughens the outer peripheral surface 1c and the peripheral edge portion (around the optical functional surface 1a) 1d of the outer peripheral surface 1c by performing so-called sand blasting, in which the abrasive particles 2 are sprayed onto the optical lens 1. The nozzle 31 which injects the abrasive grain 2, the abrasive grain supply apparatus 32 which supplies the abrasive grain 2 with gas to this nozzle 31, and the nozzle adjustment apparatus 33 which adjusts the injection direction of the nozzle 31 are provided. Hereinafter, the outer peripheral surface 1c and the peripheral edge 1d of the end surface are collectively referred to as an outer peripheral portion.

  The diameter of the nozzle 31 is appropriately set according to the size of the optical lens 1 to be processed. In general, the nozzle diameter is preferably about 5 to 10 mm. Further, when processing a fine optical lens having a diameter of about 6 mm or less, it is preferable to use a thin nozzle having a nozzle diameter of about 1 to 5 mm.

  The nozzle adjustment device 33 adjusts the injection direction or the injection position of the abrasive grains 2 with respect to the optical lens 1 sandwiched between the first support portion 10 and the second support portion 20. 2 to 4 are schematic views for explaining a preferable jetting direction or jetting position of the abrasive grains 2 with respect to the optical lens 1. In the following, the direction of the central axis N of the nozzle 31 is the injection direction of the abrasive grains 2.

  As shown in FIG. 2, when the plane including the rotation axis R of the first support portion 10 and the second support portion 20 is viewed, the injection direction of the abrasive grains 2 is 0 with respect to the plane A orthogonal to the rotation axis R. It is preferable to set it in the range of not less than 45 ° and not more than 45 °. By setting it as this range, the outer peripheral surface 1c of the optical lens 1 can be reliably blasted. In addition, by making the spraying direction of the abrasive grains 2 with respect to the plane A close to 45 °, the peripheral edge 1d of the end face of the optical lens 1 can also be blasted together.

  When spraying the abrasive grains 2 on the outer peripheral surface of the optical lens 1, as shown in FIG. 3, the position of the nozzle 31 may be fixed and the orientation of the nozzle 31 with respect to the optical lens 1 may be adjusted. As shown in the drawing, the position of the nozzle 31 relative to the optical lens 1 may be adjusted with the direction of the nozzle 31 being constant.

As shown in FIG. 3, the orientation of the nozzle 31 relative to the optical lens 1 is such that the center axis N of the nozzle 31 passes through the center (rotation axis R) of the optical lens 1 in the plane orthogonal to the rotation axis R. It is preferable to be within a range (angle θ) up to a direction passing through one tangent. Here, when the distance from the nozzle 31 to the rotation axis R is H and the radius of the optical lens 1 is r, the angle θ is given by the following equation (1).
θ = arcsin (H / r) (1)
In addition, in FIG. 3, description of the 1st support part 10 is abbreviate | omitted.

  Further, as shown in FIG. 4, the position of the nozzle 31 with respect to the optical lens 1 is from a position where the central axis N of the nozzle 31 passes through the center (central axis R) of the optical lens 1 in a plane orthogonal to the rotation axis R. It is preferable to be within a range (radius r) up to a position passing through the tangent line of the optical lens 1. In addition, also in FIG. 4, description of the 1st support part 10 is abbreviate | omitted.

Next, a method for manufacturing the optical lens according to the present embodiment will be described. FIG. 5 is a flowchart showing the lens manufacturing method according to the present embodiment.
First, in step S10, the optical lens 1 is set in the lens manufacturing apparatus 100. The optical lens 1 may be a glass molded lens produced by a heat softening molding method or a glass polished lens produced by polishing. In the present embodiment, a meniscus glass molded lens is used as the optical lens 1. In the glass molded lens, in addition to the optical functional surfaces 1a and 1b, the outer peripheral surface 1c and the peripheral edge 1d of the end surface are also finished smoothly.

  Specifically, first, the optical functional surface 1b having a convex shape is placed on the O-ring 21 so as to face downward. At this time, positioning is performed so that the optical axis of the optical lens 1 coincides with the rotation axis R. Next, the ball member 11 is placed on the concave optical function surface 1a, and the ball member 11 is held by the ball holding member 12 so as to be pressed from above. Accordingly, the O-ring holding member 22 and the O-ring 21 (second support portion 20), the optical lens 1, and the ball member 11 and the ball holding member 12 (first support portion 10) can be rotated integrally. The optical functional surfaces 1a and 1b are sealed by the ball member 11 and the O-ring 21, respectively.

  In subsequent step S <b> 11, the optical device 1 is rotated around the rotation axis R via the first support portion 10 and the second support portion 20 by operating the drive device 15 under the control of the control device 40. The rotation speed of the optical lens 1 is not particularly limited, and may be set as appropriate according to the flow rate of the abrasive grains 2 ejected from the nozzle 31. Preferably, it is set to 3 to 200 rpm.

  In subsequent step S12, the abrasive grains 2 are ejected from the nozzle 31 together with the gas. The kind of abrasive grain 2 to be used is not particularly limited, and may be set as appropriate according to the surface roughness required for the outer peripheral surface 1c of the optical lens 1 and the peripheral edge portion 1d of the end surface. For example, in order to suppress the occurrence of flare and ghost during use, the surface roughness is preferably about Ra 0.8 to 1.8 μm.

  Specific types of abrasive grains 2 that can be used include brown alumina, pulverized alumina, light red alumina, white alumina, zirconia alumina, black silicon carbide, green silicon carbide, natural diamond, synthetic diamond, and metal coating synthesis. Examples include diamond, cubic boron nitride, metal-coated cubic boron nitride, and the like.

  Alternatively, as the abrasive grains 2, composite abrasive grains in which an abrasive is attached to a ball-like or particulate base material by a wet or dry process may be used. Examples of the substrate include polyplus (registered trademark), polycarbonate, nylon, natural rubber, synthetic rubber, seed shells such as peach and apricot, walnut shells, corn, copper, iron, zinc, stainless steel and the like. On the other hand, examples of the abrasive to be adhered to the substrate include silicon carbide, diamond, chromium oxide, alumina, boron nitride, cerium oxide (ceria), and zirconium oxide (zirconia).

  The particle size of the abrasive grain 2 is not particularly limited, and particle size F150 (particle size 75 to 150 μm), particle size F220 (particle size 53 to 106 μm), particle size F230 (particle size 38 to 77 μm), particle size F280 (particle size 25 to 60 μm). Etc. can be used.

  Moreover, as gas injected with the abrasive grain 2, dry air is used, for example. This dry air is preferably pressurized to a range of about 0.2 MPa to 0.7 MPa, more preferably about 0.3 MPa to 0.5 MPa. In addition, when using a composite abrasive grain as the abrasive grain 2, it is good to make the pressure of dry air into the range of about 0.2 MPa or more and 0.5 MPa. The gas flow rate is preferably set in a range of about 10 L / min to 20 L / min. The type, particle size, gas pressure, and gas flow rate of the abrasive grains 2 may be appropriately set according to the type of the optical lens 1 and the surface roughness required for the outer peripheral portion.

  In subsequent step S13, after the flow of the abrasive grains 2 ejected from the nozzles 31 is stabilized, the nozzles 31 are directed toward the optical lens 1 and the abrasive grains 2 are sprayed onto the rotating optical lens 1. Thereby, the exposed parts (the outer peripheral surface 1c, the peripheral edge 1d of the end face, the chamfered part, etc.) of the surface of the optical lens 1 are uniformly roughened.

  What is necessary is just to set suitably the spraying time of the abrasive grain 2 according to the rotational speed of the optical lens 1, and the surface roughness requested | required of the outer peripheral surface 1c. For example, when processing the optical lens 1 having a diameter of about 6 to 25 mm, the abrasive grains 2 may be sprayed at a rotational speed of about 5 to 50 rpm for about 60 to 180 seconds. Moreover, when processing the minute optical lens 1 whose diameter is about 0.5-6 mm, it is good to spray the abrasive grain 2 for about 60-210 second at the rotational speed of about 50-200 rpm.

  In subsequent step S14, the injection of the abrasive grains 2 is stopped, and further, in step S15, the rotation of the optical lens 1 is stopped.

  In subsequent step S <b> 16, the optical lens 1 is removed from the lens manufacturing apparatus 100. Specifically, by moving the ball holding member 12 upward, the ball member 11 and the optical lens 1 are released, and the optical lens 1 is recovered.

  As described above, in the present embodiment, the abrasive grains 2 are sprayed on the optical lens 1 whose entire surface is finished to be a glossy smooth surface like a glass molded lens produced by a heat softening molding method. Thereby, only the very surfaces of the outer peripheral surface 1c and the peripheral edge 1d of the end surface can be roughened. Therefore, unlike the conventional outer diameter processing method in which the outer peripheral surface is roughened using a grinding wheel, it is possible to suppress the occurrence of internal defects such as cracks in the optical lens 1. Therefore, it is difficult for cracks and chips to occur even with respect to vibration and impact, and it becomes possible to obtain an optical lens having stronger impact resistance than before.

  Moreover, according to this Embodiment, the abrasive grain 2 is sprayed on the outer peripheral surface 1c and the peripheral part 1d of an end surface in the state which sealed the optical function surface 1a, 1b of the optical lens 1 with the ball member 11 and the O-ring 21. Therefore, it is possible to roughen only the outer peripheral surfaces 1c and 1d without generating defects such as scratches and dimples on the optical functional surfaces 1a and 1b. Therefore, the trouble of masking the optical functional surfaces 1a and 1b can be saved regardless of the shape of the optical functional surfaces 1a and 1b, and the outer peripheral surface 1c and the like can be efficiently roughened.

(Example)
As the abrasive 2, a grain size F220 (particle size 53 to 106 μm) of SACRANDOM (registered trademark) A, which is a brown alumina abrasive manufactured by Nippon Grinding Abrasive Co., Ltd., was used. Further, as the blasting condition, the pressure of the dry air is increased to 0.3 to 0.5 MPa, supplied to the nozzle 31, injected with the abrasive grains 2 at a flow rate of 10 to 20 L / min, and the outer peripheral surface 1 c of the rotating optical lens 1 and It sprayed on the peripheral part 1d of the end surface. At this time, the rotation speed of the optical lens 1 was set to 60 to 180 rpm, and spraying was performed for about 60 seconds in total.

  When the surface roughness of the outer peripheral surface 1c of the optical lens 1 after blasting was measured, it was Ra 0.8-1.8 micrometers, and it was confirmed that appropriate roughening is made | formed.

(Modification 1)
Next, Modification 1 of the embodiment of the present invention will be described. FIG. 6 is a schematic diagram illustrating a part of the lens manufacturing apparatus according to the first modification.

  In the above embodiment, the case where a meniscus lens is processed in which one optical functional surface is concave and the other optical functional surface is convex is described. However, the shape of the optical lens is not limited to this. For example, as shown in FIG. 6, the present invention can also be applied to the case where the outer peripheral surface 3c of the optical lens 3 having the biconvex optical functional surfaces 3a and 3b is roughened.

  In this case, instead of the first support portion 10 and the second support portion 20 shown in FIG. 1, two support portions 50 including an O-ring 51 and an O-ring holding member 52 are provided. Then, the outer peripheral circles of the optical functional surfaces 3a and 3b may be supported by the O-rings 51, and the region inside the outer peripheral circles may be sealed. When the curvature radii of the optical functional surfaces 3a and 3b are different from each other, the thickness of the O-ring 51 and the depth of the counterbore of the O-ring holding member 52 may be changed according to the respective curvature radii.

(Modification 2)
Next, a second modification of the embodiment of the present invention will be described. FIG. 7 is a schematic diagram illustrating a part of a lens manufacturing apparatus according to Modification 2.

  In the above embodiment, the optical functional surface 1b having a convex shape is supported by the O-ring 21 (see FIG. 1). However, the optical functional surface 1b may be supported by a ball member. Specifically, instead of the second support portion 20 shown in FIG. 1, as shown in FIG. 7, a support portion 60 including a ball member 61 and a ball holding member 62 for holding the ball member 61 is provided.

  The ball member 61 is a spherical member formed of chloroprene rubber, nitrile rubber, polypropylene, silicon rubber, fluorine rubber, natural rubber, or the like, similarly to the ball member 11 (see FIG. 1). The ball member 61 is pressed against the optical function surface 1b and is elastically deformed to cover the entire surface of the optical function surface 1b. In this case, the optical lens 1 can be supported using the same ball member 61 regardless of the diameter and the radius of curvature of the optical function surface 1b. For example, the optical function surface 1b may be planar.

  FIG. 7 shows a state in which the spherical ball member 61 is elastically deformed by pressing, but if the ball member 61 can contact and cover the optical function surface 1b of the optical lens 1, the ball member 61 is It does not have to be a perfect sphere, and may be, for example, a hemisphere or a missing sphere.

(Modification 3)
Next, a third modification of the embodiment of the present invention will be described. FIG. 8 is a schematic diagram illustrating a part of a lens manufacturing apparatus according to Modification 3.

  In the embodiment described above, the concave optical functional surface 1a is supported by the ball member 11 (see FIG. 1), but the optical functional surface 1a may be supported by an O-ring. Specifically, instead of the first support portion 10 shown in FIG. 1, as shown in FIG. 8, a support portion 70 including an O-ring 71 and an O-ring holding member 72 that holds the O-ring 71 is provided.

  The O-ring holding member 72 includes a holding shaft 72a and a flange portion 72b that extends from the holding shaft 72a toward the outer periphery. The O-ring 71 is installed in a space 72c below the flange portion 72b so as to surround the holding shaft 72a. When this O-ring 71 is brought into contact with the optical function surface 1a of the optical lens 1 and pressed downward by the O-ring holding member 72, the O-ring 71 comes into close contact with the outer circumference circle or the surface of the optical function surface 1a. The space inside the circle where the ring 71 and the optical functional surface 1a come into contact is sealed.

(Modification 4)
Next, a fourth modification of the embodiment of the present invention will be described.
In the above-described embodiment, a case has been described in which the outer peripheral surface and end surface of an optical lens whose entire surface is smoothed, such as a glass molded lens produced by a heat softening molding method, are roughened.

  However, in the lens manufacturing apparatus 100 shown in FIG. 1, an appropriate surface roughness (for example, Ra 0.8 to 1) is obtained by smoothing the outer peripheral surface of the optical lens whose outer peripheral surface is roughened by grinding. .About.8 μm) can also be applied. In this case, an optical lens whose outer peripheral surface is roughened by grinding is set in the lens manufacturing apparatus 100, and abrasive particles for mirror polishing are sprayed from the nozzle 31 toward the outer peripheral surface while rotating the optical lens. At this time, the outer peripheral surface is not completely mirror-finished, but is kept to a degree that gives a slight gloss. As a result, it is possible to improve the impact strength of the optical lens by removing minute burrs generated in the grinding process.

  On the other hand, an optical lens (glass polishing lens) manufactured by polishing, and with respect to an optical lens whose outer peripheral surface is roughened using a grinding wheel, the outer peripheral surface and Internal defects such as cracks can be alleviated by adjusting the roughness of the peripheral edge of the end face (the outer peripheral part of the optical function surface) as appropriate (Ra 0.8 to 1.8 μm). It can contribute to improvement.

  The present invention described above is not limited to the embodiments and modifications, and can be variously modified according to specifications and the like, for example, from all the constituent elements shown in the embodiments and modifications. You may exclude and form some components. It is apparent from the above description that various other embodiments are possible within the scope of the present invention.

DESCRIPTION OF SYMBOLS 1, 3 Optical lens 1a, 1b, 3a, 3b Optical functional surface 1c, 3c Outer peripheral surface 1d End surface peripheral part 2 Abrasive grain 10 First support part 11, 61 Ball member 12, 62 Ball holding member 12a Cup 12b, 22b, 72a Holding shaft 15 Drive device 20 Second support portion 21, 51, 71 O-ring 22, 52, 72 O-ring holding member 22a Dish portion 30 Abrasive grain injection unit 31 Nozzle 32 Abrasive grain supply device 33 Nozzle adjustment device 40 Control device 50 , 60, 70 Supporting part 72b Ridge part 72c Space 100 Lens manufacturing apparatus

Claims (12)

A lens manufacturing apparatus that imparts a predetermined range of roughness to an outer peripheral portion of an optical lens having two optical functional surfaces facing each other,
Two support means that abut each of the two optical functional surfaces and sandwich the optical lens opposite to each other;
Abrasive grain ejecting means for ejecting abrasive grains toward the outer peripheral portion of the optical lens sandwiched between the two support means;
With
The portions where the two support means and the two optical functional surfaces abut each other form a closed shape portion,
It said two support means, have a sealing means for sealing the inner area of the optical functional surface than the closed shape portions respectively abut,
The sealing means is an elastic member having a convex spherical surface that can come into contact with the optical functional surface.
A lens manufacturing apparatus.   The lens manufacturing apparatus according to claim 1, further comprising a driving unit that rotates the two support units around a common rotation axis. The abrasive grain spraying means sprays the abrasive grains together with gas,
A control unit for controlling the pressure and flow rate of the gas sprayed by the abrasive grain spraying means;
The lens manufacturing apparatus according to claim 1 or 2 . Lens manufacturing apparatus according to any one of claims 1 to 3, wherein the abrasive injection means further comprising an adjustment unit for adjusting the injection direction of the abrasive grains injection, characterized in that. A lens manufacturing method for providing a predetermined range of roughness to an outer peripheral portion of an optical lens having two optical functional surfaces facing each other,
A lens support step of holding the optical lens by bringing two support means into contact with the two optical function surfaces;
An abrasive grain injection step of injecting abrasive grains toward the outer peripheral portion of the optical lens sandwiched between the two support means;
Including
The portions where the two support means and the two optical functional surfaces abut each other form a closed shape portion,
In the lens supporting step, the two supporting means are sealed in the region of the optical functional surface inside the closed shape portion that abuts each other ,
At least one of the two support means includes an elastic member having a convex spherical surface,
In the lens supporting step, the convex spherical surface is brought into contact with the optical functional surface.
A method of manufacturing a lens. The abrasive jet process, while rotating the optical lens on a common rotation axis with said two support means, blowing the abrasive grains to the outer periphery,
The lens manufacturing method according to claim 5 . At least one of the optical functional surfaces has a concave shape with a smaller radius of curvature than the convex spherical surface of the elastic member,
The lens supporting step is to bring the convex spherical surface into contact with the at least one outer circumferential circle of the optical function surface and seal a region inside the outer circumferential circle;
The lens manufacturing method according to claim 5 . At least one of the optical functional surfaces has a planar shape, a convex shape, or a concave shape having a radius of curvature larger than or equal to the convex spherical surface of the elastic member,
The lens supporting step is to bring the convex spherical surface into contact with the at least one of the optical functional surfaces and seal a region where the convex spherical surface is in contact;
The lens manufacturing method according to claim 5 . At least one of the optical functional surfaces has a concave shape with a radius of curvature larger than the convex spherical surface of the elastic member,
In the lens supporting step, the convex spherical surface is brought into contact with and pressed against the at least one optical functional surface of the optical functional surface and elastically deformed, thereby sealing a region from the inner side to the outer periphery of the optical functional surface. Stop,
The lens manufacturing method according to claim 5 . The abrasive jet process, the pressure is boosted to 0.2MPa or 0.7MPa or less, and the flow rate is injecting the abrasive grains with a gas or less 10L / min or more 20L / min,
The lens manufacturing method according to any one of claims 5 to 9 , wherein: The abrasive jet process, angle injecting the abrasive in a direction at 45 ° or less 0 ° or more with respect to the plane perpendicular to the rotation axis,
The lens manufacturing method according to any one of claims 5 to 10 , wherein: The lens manufacturing method according to any one of claims 5 to 11, by heat softening molding, characterized in that it further comprises a step of preparing the optical lens.

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