JP2011162387A - Method for manufacturing lens and mold for manufacturing lens - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a lens and a mold for manufacturing a lens by which the lens is easily separated from the mold without using a releasing agent or a liquid. <P>SOLUTION: The method for manufacturing the lens uses the mold 100 provided with an upper die 101 having a projecting face 108 forming an optically effective region 204, an outer peripheral surface 110 forming an outer periphery part 203 extended from the optically effective region 204 and a projected part 112 formed at least in a part of the outer peripheral surface 110 and a lower die 102 and has: a step of placing a preform material 201 on the lower die 102; a step of forming the lens 202 having the optically effective region 204 of a recessed face to the upper mold 101 and the outer peripheral part 203 by pressing the preform material 201 with the upper die 101; a step of cooling the mold 100 and the lens 202, a step of removing the upper die 101 and a step of taking out the lens 202. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a lens that is pressure-molded by a mold and a mold for manufacturing a lens, and more particularly to a method for manufacturing a lens having a concave surface and a mold.

  2. Description of the Related Art In recent years, an image pickup apparatus has been widely used in which incident light from a lens is picked up by using a solid-state image pickup device such as a CCD (Charge Coupled Device) or CMOS (Complementary Metal Oxide Semiconductor) and converted into an electric signal and then taken out as an image. It has been. In addition, along with the demand for miniaturization and high performance of portable devices such as interchangeable lens DSC (Digital Still Camera), fixed lens DSC, and movies, the size and weight of the lens barrel, which is the main component of the imaging device, is reduced. There is a further demand for reduction in thickness and thickness. In general, a lens barrel is composed of a plurality of lens groups, each of which has a plurality of functional units such as zoom and focus.

  In recent years, lenses are often manufactured by a pressure molding method that is excellent in mass productivity using a molding die composed of an upper die, a lower die, and a body die. Specifically, the material placed on the lower mold is pressure-molded by the upper mold to form a lens original shape. Thereafter, the lens original shape is taken out of the mold and subjected to processing such as cutting. In this way, a lens is formed.

  However, in the pressure molding method, the lens original shape and the molding die are attached after pressing, and it may be difficult to separate the lens original shape from the molding die. In particular, the concave surface side of the concave lens and the convex mold have good surface accuracy of the mold. In other words, the smoothness of the mold surface is high. In this case, the airtightness between the concave side of the lens original shape and the mold is high, and it is difficult for air to enter between them, so that both easily adhere. If the original lens and the mold are attached, they cannot be easily separated, so it is necessary to stop the equipment, resulting in a problem that the equipment operation rate is lowered.

  On the other hand, in order to facilitate separation between the lens original shape and the mold, it is widely practiced to apply a release agent such as fats and oils to the mold every molding cycle. However, there has been a problem that the mold release agent applied to the mold is transferred to the lens original by pressing the upper mold and the surface of the lens original is contaminated. Further, there has been a problem that the mold release agent applied to the mold is fixed to the mold and an abnormal shape of the original lens is generated. For this reason, it is necessary to provide a process for cleaning the lens original mold and the mold, which complicates the lens manufacturing process.

  Also, in order to avoid the use of a mold release agent, a polyurethane molding raw material is injected or injected into a mold having a ceramic layer formed on the cavity surface of the mold body, and water and / or alcohol is used before separation of the lens original. A method of introducing a contained gas (such as air containing water vapor or alcohol vapor) or a liquid is disclosed (for example, see Patent Document 1).

Japanese Patent Laid-Open No. 5-96558

  Usually, when forming a lens having a concave shape with respect to the upper die, the upper die is extended from the convex surface of the upper die so as to have an R shape having a radius of curvature opposite to the convex surface in the barrel die direction. Configured. This is for securing the amount of the upper mold and the body mold. When the lens material is pressed using the mold having such a configuration, the lens material is stretched to the R-shaped portion of the upper mold and spreads. Therefore, there is a problem that the lens material adheres to the R-shaped portion and it is difficult to separate it from the upper mold.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a lens manufacturing method and a lens manufacturing mold capable of easily separating a lens and a mold.

  In the lens manufacturing method of the present invention, a convex surface that forms an optically effective region with respect to a lens material, an outer peripheral surface that forms an outer peripheral portion extending from the optically effective region, and a convex portion are formed on at least a part of the outer peripheral surface. A lens manufacturing method using a mold having a mold and a lower mold, the step of placing the lens material on the lower mold, and pressing the lens material with the upper mold to form a concave surface with respect to the upper mold Forming a lens having an optically effective area and an outer periphery, and removing the upper mold and taking out the lens.

  According to such a method, since an air layer is formed between the convex part and the lens outer peripheral part, the airtightness between the upper mold and the lens is lowered. Therefore, the lens and the upper mold can be easily separated.

  In addition, the mold for manufacturing a lens of the present invention has a convex surface that forms an optically effective region on a lens material, an outer peripheral surface that forms an outer peripheral portion that extends from the optically effective region, and a convex portion that is formed on at least part of the outer peripheral surface An upper mold and a lower mold are provided.

  According to such a configuration, since an air layer is formed between the convex portion and the lens outer peripheral portion on the outer peripheral surface of the upper die, the airtightness between the upper die and the lens original shape is lowered. Therefore, the lens original shape and the upper die can be easily separated.

  In the lens manufacturing method of the present invention, a rough surface portion is formed on at least a part of the outer peripheral surface and the outer peripheral surface forming the outer peripheral portion extending from the convex surface forming the optical effective region with respect to the lens material, and the optical effective region. A lens manufacturing method using a mold having a mold and a lower mold, the step of placing the lens material on the lower mold, and a concave surface with respect to the upper mold by pressing the lens material with the upper mold Forming a lens having an optically effective area and an outer peripheral portion, and removing the upper mold and taking out the lens.

  According to such a method, the contact area between the rough surface portion and the lens outer peripheral portion is reduced, and an air layer is formed, so that the airtightness between the upper mold and the lens is lowered. Therefore, the lens and the upper mold can be easily separated.

  The mold for producing a lens according to the present invention has a convex surface that forms an optically effective region with respect to a lens material, an outer peripheral surface that forms an outer peripheral portion that extends from the optically effective region, and a rough surface portion formed on at least a part of the outer peripheral surface. An upper mold and a lower mold.

  According to such a configuration, the contact area between the rough surface portion and the lens outer peripheral portion is reduced, and an air layer is formed, so that the airtightness between the upper mold and the lens is lowered. Therefore, the lens and the upper mold can be easily separated.

  According to the lens manufacturing method of the present invention, the lens and the upper mold can be easily separated. Therefore, it is possible to improve the equipment operation rate in the lens molding process.

  According to the lens manufacturing mold of the present invention, the lens and the upper mold can be easily separated. Therefore, it is possible to improve the equipment operation rate in the lens molding process.

Schematic cross-sectional view of the molding die in the first embodiment Front view of the same mold as seen from the bottom The principal part enlarged view of the sectional view on the AA line in FIG. Lens manufacturing flowchart in the first embodiment Schematic cross-sectional view of the mold of the same manufacturing step (S1) Schematic cross-sectional view of the mold of the same manufacturing step (S2) Schematic cross-sectional view of the mold of the same manufacturing step (S3 and S4) Schematic cross-sectional view of the mold of the same manufacturing step (S5) The front view which looked at the upper mold in modification 1 from the lower mold direction The principal part enlarged view of the sectional view on the AA line in FIG. The front view which looked at the upper model in modification 2 from the lower model direction The principal part enlarged view of the AA sectional view in FIG. Schematic cross-sectional view of a mold according to Embodiment 2 Front view of the same mold as seen from the bottom FIG. 14 is an enlarged view of a main part of the cross-sectional view along the line AA in FIG. The front view which looked at the upper mold in modification 1 from the lower mold direction The principal part enlarged view of the sectional view on the AA line in FIG. The front view which looked at the upper mold in modification 1 from the lower mold direction The principal part enlarged view of the sectional view on the AA line in FIG. The front view which looked at the upper mold in modification 1 from the lower mold direction The principal part enlarged view of the sectional view on the AA line in FIG.

(Embodiment 1)
[1. Outline of Mold 100]
As shown in FIG. 1, a mold 100 that is a lens manufacturing mold includes a lower mold 102 disposed on a base plate 105 and an upper mold 101 disposed to face the lower mold 102. A cylindrical inner trunk mold 103 is disposed so as to surround the lower mold 102, and a cylindrical outer trunk mold 104 is disposed on the outer periphery of the inner trunk mold 103.

  The upper mold 101 has a convex surface 108 for processing the lens surface into a concave surface. The upper mold 101 is driven up and down by a pressurizing means 106 connected coaxially with the upper mold 101. The pressurizing means 106 is connected to a hydraulic device or the like via a press shaft (not shown).

  The lower mold 102 is fixed to the base plate 105 and has a concave surface 109 for processing the lens surface into a convex surface. Further, when processing the lens surface into a concave surface, the lower mold 102 has a convex surface.

  The outer trunk mold 104 has a cylindrical shape with an inner dimension larger than the outer dimension of the lower mold 102. The outer body mold 104 is arranged on the base plate 105 so as to surround the lower mold 102.

  The inner cylinder mold 103 has a cylindrical shape with an outer dimension smaller than the inner dimension of the outer cylinder mold 104. Further, the height of the inner trunk mold 103 is lower than the height of the outer trunk mold 104. Further, the inner body mold 103 is disposed so as to cover the inside of the outer body mold 104 and a part of the outer edge of the lower mold 102. Further, the inner dimension of the inner cylinder mold 103 is larger than the outer dimension of the upper mold 101, and the upper mold 101 is incorporated into the inner cylinder mold 103 during pressure molding.

  The downward driving of the upper mold 101 during the pressure molding stops when the pressing means 106 and the upper end portion of the outer body mold 104 abut against each other. That is, the lens shape is determined by the distance between the convex surface 108 of the upper mold 101 and the concave surface 109 of the lower mold 102 at this time.

  As the material of the mold 100, a material excellent in mechanical strength characteristics is suitable. For example, ceramic materials such as silicon carbide (SiC) and silicon nitride (SiN), cermet materials such as cemented carbide, heat-resistant steels such as molybdenum (Mo) steel, nickel (Ni) -chromium (Cr) steel, and stainless steel It is mentioned as a preferable mold material. In the present embodiment, silicon carbide (SiC) obtained by cutting and polishing is used as the mold 100.

[2. Details of upper mold 101]
As shown in FIGS. 2 and 3, an outer peripheral surface 110 is formed around the convex surface 108. Further, an R-shaped portion 114 having an R shape with a radius of curvature opposite to the convex surface 108 is formed around the outer peripheral surface 110. Furthermore, convex portions 112 that are circular when viewed from the direction of the lower mold 102 and have a semicircular cross section are formed in two locations and at positions facing each other inside the outer peripheral surface 110. The outer peripheral surface 110, the R-shaped portion 114, and the convex portion 112 are formed, for example, by cutting and polishing after forming the original mold of the upper mold 101. Note that the upper mold 101 is symmetrical in FIG.

  It should be noted that the number of formation portions of the convex portion 112 may be more than two. In this case, the process of forming the upper mold 101 is complicated, but the effect of reducing the adhesive force between the upper mold 101 and the lens 202 is increased.

[3. Manufacturing method of lens 202]
The manufacturing method of the lens 202 in the first embodiment will be described in detail along the flowchart shown in FIG.

  First, in the lens material placing step (S1), as shown in FIG. 5, a room temperature mold 100 is prepared in which a lower mold 102, an inner trunk mold 103, and an outer trunk mold 104 are installed on a base plate 105. Is done. Next, a glass preform material 201 which is a lens material is placed on the center of the lower mold 102. In this embodiment, glass preformed into a predetermined shape is used as the preform material 201, but molten glass may be used.

  Next, in the upper mold assembling step (S2), the upper mold 101 is assembled into the outer trunk mold 104 and the inner trunk mold 103 as shown in FIG. In this step, the mold 100 and the preform material 201 are heated to the glass softening point temperature or higher by a ceramic heater (not shown) arranged above and below the mold 100. In this way, the preform material 201 is held in a processable state. In the present embodiment, a preform material 201 having a glass softening point temperature of 580 ° C. was used, and the mold 100 and the preform material 201 were heated to 610 ° C.

  Next, in the pressure forming step (S3), as shown in FIG. 7, the preform material 201 is pressed by the upper mold 101 for a predetermined time. Thereby, as shown in FIG. 8, the outer peripheral part 203 and the optically effective area 204 are formed on the surface facing the upper mold 101 of the lens 202. In the present embodiment, the upper mold 101 is pressed by the pressurizing means 106 for 100 seconds with a force of 250 kgf.

  In this step, the preform material 201 is extended by the upper mold 101 and expanded in the radial direction. That is, the preform material 201 is stretched by the upper mold 101 to become the lens 202. Further, the outer edge of the preform material 201 exceeds the convex portion 112 but is prevented by the convex portion 112 and does not reach the R-shaped portion 114.

  Next, in the cooling step (S <b> 4), in a state where the lens 202 is pressed against the upper mold 101, the mold 100 and the lens 202 are cooled until the temperature is equal to or lower than the glass transition temperature of the lens 202. Further, in order to fix the shape of the lens 202, the lens 202 is held for a predetermined time while being pressed against the upper mold 101. In this step, the mold 100 and the lens 202 are cooled by placing the mold 100 on a water-cooled cooling plate.

  In the present embodiment, the lens 202 having a glass transition temperature of 540 ° C. is formed. Therefore, this step was controlled so that the mold 100 was held at 500 ° C. for 100 seconds.

  Here, there is a difference in linear expansion coefficient between the upper mold 101 and the lens 202, and the concave surface of the lens 202 contracts in the direction of wrapping the convex surface 108 during the cooling process of the mold 100. In particular, the lens 202 contracts rapidly when cooled below the glass transition temperature. For this reason, the concave surface side of the lens 202 is likely to adhere to the upper mold 101. Further, when the lens 202 adheres to the R-shaped portion 114, it becomes more difficult to separate the lens 202 from the upper mold 101.

  However, in the present embodiment, since the convex portion 112 is provided on the outer peripheral surface 110 of the upper mold 101, the adhesion between the lens 202 and the upper mold 101 is weak.

  Next, in the upper mold take-out step (S5), as shown in FIG. 8, the upper mold 101 is pulled up together with the pressurizing means 106, and the upper mold 101 is taken out from the inner cylinder mold 103 and the outer cylinder mold 104. At this time, since the lens 202 and the upper mold 101 are easily separated, the upper mold 101 can be taken out while the lens 202 remains on the lower mold 102.

  Finally, in the lens removal step (S6), the lens 202 remaining on the lower mold 102 is removed. Further, when it is necessary to cut the outer peripheral portion of the lens 202, the lens 202 is taken out, and the center of the lens 202 is fixed from both sides (bell chuck) and rotated. Furthermore, by using a grindstone such as diamond, the periphery of the lens 202 is cut and the processing is completed.

[4. Summary]
In the lens manufacturing method of the present embodiment, a convex surface 108 that forms an optically effective region with respect to the preform material 201, an outer peripheral surface 110 that forms an outer peripheral portion extending from the optically effective region, and a convex portion at least on the outer peripheral surface 110 A method of manufacturing a lens using a molding die 100 including an upper die 101 on which a portion 112 is formed, and a lower die 102, the step of placing a preform material 201 on the lower die 102 (S1); A step (S3) of forming a lens 202 having a concave optically effective area and an outer peripheral portion with respect to the upper mold 101 by pressing the preform material 201 with the upper mold 101, and cooling the mold 100 and the lens 202. Step (S4), removing upper mold 101 (S5), and removing lens 202 (S6).

  According to such a method, since an air layer is formed between the convex part 112 and the outer peripheral part 203, the airtightness between the upper mold | type 101 and the lens 202 becomes low. Therefore, the lens 202 and the upper mold 101 can be easily separated without using a release agent or liquid.

  The mold for manufacturing a lens according to the present embodiment includes a convex surface 108 that forms an optically effective region 204 with respect to a preform material 201, an outer peripheral surface 110 that forms an outer peripheral portion 203 that extends from the optically effective region 204, and an outer peripheral surface 110. An upper die 101 having a convex portion 112 formed at least in part and a lower die 102 are provided.

  According to such a configuration, since an air layer is formed between the convex portion 112 and the outer peripheral portion 203, the airtightness between the upper mold 101 and the lens 202 is lowered. Therefore, the lens 202 and the upper mold 101 can be easily separated without using a release agent or liquid.

[5. Modification of Embodiment 1]
For the upper mold 101, the following modifications can be considered. In the following description, the same elements as those of the upper mold 101 described above are denoted by the same reference numerals, and the description thereof is omitted as appropriate.

(Modification 1)
As shown in FIG. 9, the convex portion 212 is formed in an annular shape surrounding the convex surface 108 in the outer peripheral surface 110. Moreover, as shown in FIG. 10, the cross section of the convex part 212 is formed so that it may become a rectangle. In addition, the cross section of the convex part 212 may be formed in a U shape. Furthermore, the cross section of the convex portion 212 may be formed in a triangular shape. In short, the convex portion 212 may be formed in an annular shape surrounding the convex surface 108 in the outer peripheral surface 110.

  By using the upper mold 101 having such a configuration, an air layer is formed between the convex portion 212 and the outer peripheral portion of the lens 202 in the pressure molding step (S4), and the area of the air layer is further increased. Further, the airtightness between the upper mold 101 and the lens 202 is further reduced. Therefore, the lens 202 and the upper mold 101 can be more easily separated without using a release agent or liquid. Moreover, since the convex part 212 is cyclic | annular, formation with a lathe is attained. Therefore, the upper mold 101 can be easily formed.

(Modification 2)
As shown in FIG. 11, the convex portions 214 are radially formed in four locations from the convex surface 108 to the R-shaped portion 114 in the outer peripheral surface 110. Further, as shown in FIG. 12, the cross section of the convex portion 214 is formed in a triangular shape. In addition, the cross section of the convex part 214 may be formed in a U shape or a semicircle. Moreover, the cross section of the convex part 214 may be formed in a rectangle. In addition, the convex part 214 is not restricted to four places, and can also be formed in three places or two places. However, when the number of locations where the convex portions 214 are formed is reduced, the effect of reducing the adhesion between the lens 202 and the upper mold 101 is reduced.

  By using the upper mold 101 having such a configuration, an air layer is formed between the convex portion 214 and the outer peripheral portion of the lens 202 in the pressure molding step (S4), and the air layer can be vented to the outside. Further, the airtightness between the upper mold 101 and the lens 202 is further reduced. Therefore, the lens 202 and the upper mold 101 can be more easily separated without using a mold release agent or liquid.

(Embodiment 2)
[6. Details of upper mold 301]
As shown in FIG. 13, the mold 300 that is the lens manufacturing mold in the second embodiment is different from the mold 100 in the first embodiment in the configuration of the upper mold 301. Therefore, the other components related to the mold 300 are the same as the components of the mold 100. Therefore, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted as appropriate. Further, since the lens manufacturing flow is the same as that of the first embodiment, the description thereof is omitted.

  As shown in FIGS. 14 and 15, an outer peripheral surface 110 is formed around the convex surface 108. Further, an R-shaped portion 114 having an R shape with a radius of curvature opposite to the convex surface 108 is formed around the outer peripheral surface 110. Further, the outer peripheral surface 110 has a substantially fan shape (a long arc is on the R-shaped portion 114 side and a short arc is on the convex surface 108 side) as viewed from the lower mold 102 direction, and a rough surface portion having a straight section. 302 is formed at two positions and at positions facing each other. The outer peripheral surface 110 and the R-shaped portion 114 are formed by cutting and polishing after the original mold of the upper mold 101 is formed. In addition, the rough surface portion 302 is formed by performing blast processing, file processing, or the like after masking portions other than the planned processing portion. In the present embodiment, the rough surface portion 302 of Ra: 30 μm was formed by using 400-number sandpaper. The upper mold 101 is symmetrical in FIG.

  By using the upper die 301 having such a configuration, the contact area between the rough surface portion 302 and the outer peripheral portion of the lens 202 is reduced and an air layer is formed in the pressure molding step (S4). Airtightness between the lens 301 and the lens 202 is reduced. Therefore, the lens 202 and the upper mold 301 can be easily separated without using a release agent or liquid.

  Furthermore, the following modifications can be considered for the upper mold 301 in the present embodiment.

(Modification 1)
As shown in FIG. 16, the rough surface portion 304 is formed in an annular shape around the convex surface 108 in the outer peripheral surface 110. Further, as shown in FIG. 17, the cross section of the rough surface portion 304 is formed continuously with the R-shaped portion 114 in the outer peripheral surface 110.

  As shown in FIGS. 18 and 19, the rough surface portion 306 may be formed continuously with the convex surface 108. If the curvature radius of the convex surface 108 is large and the amount of engagement with the inner body mold 103 can be secured without providing the R-shaped part 114, the upper mold 101 on which the R-shaped part 114 is not formed can be used. Good.

  As shown in FIGS. 20 and 21, when the R-shaped portion 114 is formed continuously around the convex surface 108 around the convex surface 108, the rough surface portion 308 is formed around the R-shaped portion 114. And may be formed continuously.

  By using the upper die 301 having such a configuration, the contact area between the rough surface portions 304, 306, and 308 and the outer peripheral portion of the lens 202 is reduced in the pressure molding step (S4), and an air layer is formed. Therefore, since the airtightness between the upper mold 301 and the lens 202 is lowered, the lens 202 and the upper mold 101 can be more easily separated without using a mold release agent or a liquid. Further, since the rough surface portions 304, 306 and 308 are annular, they can be formed by a lathe. Therefore, the upper mold 301 can be easily formed.

(Other embodiments)
As described above, the embodiment of the present invention has been exemplified. However, the present invention is not limited to this. Therefore, another embodiment of the present invention will be described below. In addition, this invention is not limited to these, It is applicable also to other embodiment modified suitably.

  In the first embodiment and the second embodiment, examples in which the present invention is applied to the upper mold 101 are shown. However, the present invention is not limited to this. For example, it can be applied to the lower mold 102. Furthermore, the present invention can be applied to both the upper mold 101 and the lower mold 102. In other words, the present invention can be applied to a mold for pressure-molding a lens or a lens manufacturing method using the mold.

  According to the lens manufacturing method and the lens manufacturing mold of the present invention, the lens and the upper mold can be easily separated. Therefore, it is possible to improve the equipment operation rate in the lens molding process.

  For this reason, the present invention is widely useful in manufacturing lenses for portable devices such as interchangeable lens DSCs (Digital Still Cameras), fixed lens DSCs, and movies, or television cameras and surveillance cameras.

100, 300 Mold 101, 301 Upper mold 102 Lower mold 103 Inner cylinder mold 104 Outer cylinder mold 105 Base plate 106 Pressing means 108 Convex surface 109 Concave surface 110 Outer peripheral surface 112, 212, 214 Convex portion 114 R-shaped portion 201 Preform material 202 Lens 203 Outer peripheral part 204 Optical effective area 302, 304, 306, 308 Rough surface part

Claims (12)

A lens manufacturing method using a mold,
The molding die includes a convex surface that forms an optically effective region with respect to a lens material, an outer peripheral surface that forms an outer peripheral portion extending from the optically effective region, and an upper die in which convex portions are formed on at least a part of the outer peripheral surface. And a lower mold,
The method
Placing the lens material on the lower mold;
Forming a lens having the concave optically effective area and the outer peripheral portion with respect to the upper mold by pressing the lens material with the upper mold;
Removing the upper mold and taking out the lens;
Having
Lens manufacturing method. The convex portion is formed in an annular shape surrounding the convex surface on the outer peripheral surface,
The lens manufacturing method according to claim 1. The convex portion is formed radially from the convex surface on the outer peripheral surface,
2. The lens manufacturing method according to claim 1. A convex surface that forms an optically effective region with respect to the lens material, an outer peripheral surface that forms an outer peripheral portion that extends from the optically effective region, an upper die that has a convex portion formed on at least a part of the outer peripheral surface, and a lower die ,
With
Mold for lens production. The convex portion is formed in an annular shape surrounding the convex surface on the outer peripheral surface,
The mold for manufacturing a lens according to claim 4. The convex portion is formed radially from the convex surface on the outer peripheral surface,
The mold for manufacturing a lens according to claim 4. A lens manufacturing method using a mold,
The molding die includes a convex surface that forms an optically effective region with respect to a lens material, an outer peripheral surface that forms an outer peripheral portion extending from the optical effective region, and an upper die in which a rough surface portion is formed on at least a part of the outer peripheral surface. And a lower mold,
The method
Placing the lens material on the lower mold;
Forming a lens having the concave optically effective area and the outer peripheral portion with respect to the upper mold by pressing the lens material with the upper mold;
Removing the upper mold and taking out the lens;
Having
Lens manufacturing method. The rough surface portion is formed in an annular shape surrounding the convex surface on the outer peripheral surface,
The lens manufacturing method according to claim 7. The rough surface portion is formed continuously with the convex surface,
The lens manufacturing method as described in any one of Claim 7 or Claim 8. A convex surface that forms an optically effective region with respect to the lens material, an outer peripheral surface that forms an outer peripheral portion extending from the optically effective region, an upper die in which a rough surface portion is formed on at least a part of the outer peripheral surface, and a lower die ,
With
Mold for lens production. The rough surface portion is formed in an annular shape surrounding the convex surface on the outer peripheral surface,
The mold for producing a lens according to claim 10. The rough surface portion is formed continuously with the convex surface,
The mold for producing a lens according to any one of claims 10 and 11.

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